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2012 International Transaction Journal of Engineering, Management, & Applied Sciences & Technologies.




                  International Transaction Journal of Engineering,
                  Management, & Applied Sciences & Technologies
                             http://www.TuEngr.com,             http://go.to/Research




                    Design and Construction of Beach Cleaning Trailer by Finite
                    Element Method
                                               a*                        b                           b
                    Kuson Prakobkarn , Banyat Saitthiti , Sakda Intaravichi

a
  Department of Rural Technology Faculty of Science and Technology, Thammasat University,
THAILAND
b
  Department of Farm Mechanics Faculty of Agriculture, Kasetsart University, THAILAND

ARTICLEINFO                        A B S T RA C T
Article history:                           The design of a beach cleaning trailer is presented. The
Received 23 September 2011
Received in revised form           basic design principle of a foreign beach cleaning machine was
12 February 2012                   taken into consideration. Apart from the tire and hydraulic hoses,
Accepted 13 February 2012          all components of the beach cleaning trailer were made from
Available online
14 February 2012                   steel. This study focuses on stress analysis in the ball bearing
Keywords:                          housing by the finite element method. Actual tests have been
Stress,                            carried out in fields. This study aims to report the performance of
Bearing housing,                   the beach cleaning trailer. Stresses in the ball bearing housing are
Beach cleaning Trailer,            calculated by FEM.
Finite element method.
                                     2012 International Transaction Journal of Engineering, Management, &
                                   Applied Sciences & Technologies



1. Introduction 
     Many beaches in Thailand are tourist attractions. Large number of tourists visit these
beaches but they also deposits a large amount of garbage that local officers must collect and
transport them to garbage dumping area at a very high cost. This work tried to solve problem
by conducting field test at Bang saen beach, a 5 km long coastline sea located on Chonburi
province (www.saensukcity.com). During January to October each year, authorities normally
have problems with garbage on the sand about 10 cubic meters per day. In the rainy season,
wind storms blow landward taking plastic bags, young coconut etc., all over the beach areas.
*Corresponding author (K.Prakobkarn). Tel/Fax: +66-2-5644482. E-mail address:
kuson@tu.ac.th     2012. International Transaction Journal of Engineering, Management, &
Applied Sciences & Technologies. Volume 3 No.2        ISSN 2228-9860      eISSN 1906-9642.
                                                                                                             111
Online Available at http://TuEngr.com/V03/111-123.pdf.
Junks came with the water flow from Bangpakong river to the coastal of Saensuk
municipality, have been trapped by installing the waste trap buoy 5 km away from the
seashore which help to prevent some wastes getting to the beach. Now it has been long used
and got damaged. So Saensuk municipality had imported beach trash collection trailers. But
now they can not be used it because of lack of necessary spare parts that must be ordered from
abroad. For example, the belt conveyor is out of order due to rubbing out on the side of trailer
because the seashore has slope and not smooth. Saensuk municipality officials used the
loader tractor and tractor attacking with the rake to clean and collect garbages on coastal sea
in the morning, but paying high expenses. Based upon these reasons, beach cleaning trailer
have been designed and fabricated such that it is suitable for various beach terrains and used
local materials. Specially, as it is found that ball bearings are frequently got damaged,
therefore the ball bearing housing failures have been studied and analyzed using Finite
Element Method (FEM) (Dechamphai and Phongthanapanich, 2007).

1.1 Objectives of the research 
    Main objectives of this study are
    1. Study, collect and analyze related materials and data of the existing beach trailer in
order to be used as a basis for the design and development of the beach cleaning trailer.
    2. Design an appropriate beach cleaning trailer prototype for an effectively utilization in
Thailand, and
    3. Fabricate a beach cleaning trailer prototype according to the mechanical study and
design.




    Figure 1: Beach Cleaning Trailer Prototype -1. transporting and shaking sand system
    2. Transmisssion conveyor 3. Shaking sand tray 4. Hydraulic system 5.Ball bearing
                  6. Trash tray 7.Back hydraulic system 8.Reel of blade.

    112          Kuson prakobkarn,Banyat Saitthiti, Sakda Intharavichai.
2. Design of a beach cleaning trailer 
     A beach cleaning trailer prototype as shown in Figure 1 was design by using a Solid
Works program. Designed details of beach cleaning trailer prototype can be detailed in
subtopics.

2.1 Design of transporting and shaking system 
     The design of transporting and shaking system of the beach cleaning trailer prototype as
shown in Figure 1 comprises of major components as follows:
    1. Conveyor system: Conveyor belt was designed to transport the trash and send into the
        shaking tray and collect in trash bin as shown in Figure 1.
    2. Transmission conveyor: Transmission conveyor was designed to transmit the power
        from PTO though gearbox and chain.
    3. Shaking sand tray: Shaking tray was designed to separate and remove the associated
        trashed from the sand. The shaking tray was installed after the conveyor.
    4. Hydraulic system:         Hydraulic system through the by hydraulic cylinders were
        designed and utilized to actuate and control of lifting up and down the conveyor
        system and compressing the can in the bin and there is hydraulic motor for driving a
        reel of 16 blade with speed 20 revolution per minute.

2.2 Design of transmission system 
     Transmission system of the beach cleaning trailer was designed basically using gear box,
belt and chain and motor hydraulic
         1. Gearbox: Gear box was designed to reduce the speed of PTO and transmission of
             the driver of shaft of beach cleaning trailer
             2. Belt: Belt is used to transmit power from gear box which ratio is 1: 60, turn left
to the conveyor sprocket.

2.3 Fuel consumption rate 
     A fuel consumption equation for a specific operation is determined by total tractor power
for that operation and the equivalent PTO power is devided by the rated maximum to get a
percent load for the engine. The fuel consumption at that load is obtained from ASAE D497,
clause3 (ASAE, 2000)


*Corresponding author (K.Prakobkarn). Tel/Fax: +66-2-5644482. E-mail address:
kuson@tu.ac.th     2012. International Transaction Journal of Engineering, Management, &
Applied Sciences & Technologies. Volume 3 No.2        ISSN 2228-9860      eISSN 1906-9642.
                                                                                             113
Online Available at http://TuEngr.com/V03/111-123.pdf.
=          x PTotal                                                              (1)
    Where:
       FEC           = Estimated fuel consumption for a particular operation, L/h.
       Fspc          = Specific fuel consumption for the given tractor, determined
                         From ASAE D497, clause3, L/kWh
       PTotal        = Total tractor power(PTO equivalent) for the particular operation
                         kW( 1hp = 0.74 kW )

2.4 Stress analysis by using finite element method 
    Finite element analysis is first presented by creating differential equation and the
appropriate boundary condition. It has to derive the body into an equivalent system of finite
elements with associated modes and choosing the most appropriate element type to model
most closely the actual physical behavior (Logan, 2002).


    On the basis that the equation must be consistent with the equations of the problem, then
the element equations are combined to obtain the total equations in the matrix forms. The size
of matrix is depend on dividing element of model, and solve the global equation Boundary
conditions are then applies and the set of simultaneous equations are solved for the
generalized displacement unknown by Mathematical model (Logan, 2002).

2.4.1 Strain – displacement relation 
    The strains induced in the body can be expressed in terms of the displacement u,v,w,
respectively. In general, each of these components u,v,w is a function of coordinates x,y, and
z. The strains induced in the body can be expressed in terms of displacements u,v,w and can
be found as (Supakorn, 1992).


                 ε             ,    ,   ,     ,   ,                                                (2)


    where       , ε , ε is normal strain and            ,    ,     is shear strain respectively.


    If the displacements are assumed to be small.
    When the body undergoes deformation under the the action of external load ,the strain-
displacement relation can be derived as( Chou, P.C. and Pagaro, J.N,1967)

    114              Kuson prakobkarn,Banyat Saitthiti, Sakda Intharavichai.
(3)

2.4.2 Constitutive equation 
     If the material is linearly elastic and isotropic. The relationship between the stress and
strain is given by generized Hooke’s law. For an isotropic material, this is in three (Shigiey,J.
E., Mischke, C.R., and Budynas, R.G ,2004)
                                ν

                                ν                                                            (4)

                                ν


     And
                            τ
                        G

                                                                                             (5)
                        G

                            τ
                        G


        Where E is the modulus of elasticity, ν the Poisson’s ratio and G the shear modulus, given as


                                                                                             (6)
                            ν


     Equation can be written in a compact matrix

                                                                                             (7)


     Where matrix D is defined as symmetric material matrix (Beer, 2001)




                                                                                             (8)
*Corresponding author (K.Prakobkarn). Tel/Fax: +66-2-5644482. E-mail address:
kuson@tu.ac.th     2012. International Transaction Journal of Engineering, Management, &
Applied Sciences & Technologies. Volume 3 No.2        ISSN 2228-9860      eISSN 1906-9642.
                                                                                                   115
Online Available at http://TuEngr.com/V03/111-123.pdf.
For ball bearing housing, stress analysis can be simply obtained using finite element
method. The static loads are applied according to the Octahedral stress theory (Von Mises)
predicting the yield strengths under all conditions. The Von Mises stress equation is

                                                                             1
                               1             2            2            2 2
               σVon Mises =         σ1 -σ2 + σ2 -σ3 + σ3 -σ1                        (11)
                              √3




3. Analytical Results of Bearing Housing Stress 
    Conveyor structure is made of carbon steel and cast iron. Their unit weights are
       Carbon steel 76.5 kN/m3
       Cast iron          70.6 kN/m3(Shigiey,J. E., Mischke, C.R., and Budynas, R.G .2004)

3.1 Garbage transporting structure 




                               Figure 2: Garbage transporting structure


    Garbage transporting structure is exhibited in Figure 2. It weight is calculated as given in
Table 1.

3.2 Conveyor Unit 
    Conveyor unit in Figure 3 is used to carry trash from beach area into shaking tray unit.
Reel of blade in Figure 4 is installed upfront of the conveyor unit. Weights of conveyor unit
are elaborated and totalized in Table 1.




                             Figure 3: Conveyor unit. (Prakobkarn, 2010)

    116            Kuson prakobkarn,Banyat Saitthiti, Sakda Intharavichai.
Figure 4: Reel of blade. (Prakobkarn, 2010)


                Table 1: Total weight of all structural parts and a conveyor unit.

                                              Density     Volume         g        Weight     Weight
               Description
                                              (kg/ m3)     (m3)        (m/s2)      (kg)       (N)

1. Garbage transporting structure               76.5        0.018         -                   1,377

2. Conveyor Unit
     2.1 Weight of L-shape steel
                                                  -           -         9.81                   197
     ( 20 kg )
     2.2 Mesh conveyor + driver chain
                                                  -           -         9.81                  197
     ( 20 kg )
     2.3 Shaft weight 2 set                     76.5       0.0011         -                    168

     2.4 Plastic wheel 2 set                                            9.81         5        98.1

     2.5 ball bearing weight 4 set              70.6       0.0002          -             -    56.48

     2.7 driver pulley                          70.6       0.0002          -             -    14.12

     2.8 Sweeping shaft                         76.5       0.0024          -             -    183.6
                                                          0.00005
     2.9 Small pulley (3in diameter)            70.6                       -             -     3.74
                                                              3

     2.10 Big pulley (12in diameter)            70.6      0.00026          -             -    18.36

     2.11 Sweeping shaft cover                  76.5      0.00027             -          -     20.7

     2.12 Sweeping ball bearing 2 set           70.6      0.00014             -          -    19.76

     Total all weight                                                                        2,353.86




*Corresponding author (K.Prakobkarn). Tel/Fax: +66-2-5644482. E-mail address:
kuson@tu.ac.th     2012. International Transaction Journal of Engineering, Management, &
Applied Sciences & Technologies. Volume 3 No.2        ISSN 2228-9860      eISSN 1906-9642.
                                                                                               117
Online Available at http://TuEngr.com/V03/111-123.pdf.
Using all weight from Table 1, there are three points to support the conveyor unit,
attaching hydraulic point and two both sides of ball bearings. Each point gets equal average
weight according to the force equal 2,353.86N / 3 = 784.62 N. Sand friction against to ball
bearing housing is shown in Figure 5.




                 Figure 5: Sand friction force against to ball bearing housing

    It is estimated that sand friction force to the conveyor structure equals to 556.25 N/in
width (125 lb/in).




                              Figure 6: Width of conveyor structure.


    Width of conveyor structure (Figure 6) is touching with sand = 1,110 mm or 43.70 in
Thus; Force against conveyor unit = 133.5N/in.


    Width x 43.70 in = 5833.95 N




    118          Kuson prakobkarn,Banyat Saitthiti, Sakda Intharavichai.
Figure 7: Sand friction force against conveyor unit.

     Having conveyor tilt angle 18.26 degrees with flat area, acting force can be obtained as
5,833.95 N (cos 18.26°) = 5540.18 N. Sand friction acts to three areas such as hydraulic
attaching area and both side of ball bearing housing. For simplicity, it is assumed that the
hydraulic cylinder force acts only in horizontal. The force with 18.26 degree tilt angle act to
ball bearing housing both of them equal to 5,540.18 N/2 = 2770.09 N.

     Ball bearing housing is failure due to sand friction force against to conveyor structure
because the quantity of force is greater than conveyor weight. With material properties given
in Tables 2 and 3, the FEM results can be visually seen in Figures 8-13 and Von Misses Stress
is given in Table 4.




                 Figure 8: Sand resistance force against to ball bearing housing




 Figure 9: Color fringe plot of the Von Mises stress distributions the maximum is 63.0 MPa
*Corresponding author (K.Prakobkarn). Tel/Fax: +66-2-5644482. E-mail address:
kuson@tu.ac.th     2012. International Transaction Journal of Engineering, Management, &
Applied Sciences & Technologies. Volume 3 No.2        ISSN 2228-9860      eISSN 1906-9642.
                                                                                             119
Online Available at http://TuEngr.com/V03/111-123.pdf.
Figure 10: Finite element mesh on bearing housing




      Figure11: Maximum displacement equal to 1.832 e-002 mm




             Figure 12: Maximum strain equal to 2.053 e-004




120   Kuson prakobkarn,Banyat Saitthiti, Sakda Intharavichai.
Figure 13: Minimum safety factor equal to 3.94


                   Table 2: Material & Engineering Properties of used bearing.
                  Material type:                           Cast Carbon Steel
                  Material Model Type:                     Linear Elastic Isotropic
                  Default failure Criterion                Max Von Mises Stress
                  Mass                                     0.678171kg
                  Volume                                   8.694512 e-005
                  Elastic modulus                              2e+011 N/m2
                  Poisson’s ratio                              0.32 NA
                  Shear modulus                                7.6e+010 N/m2
                  Mass density                                 7800 Kg/m3
                  Tensile strength                             4.825e+008 N/m2
                  Yield strength                               2.4817e+008 N/m2
                  Thermal expansion coefficient                1.2e-0051/Kelvin
                  Thermal conductivity                         30 W/(m.K)
                  Specific heat                                500 J/(kg.K)



                                  Table 3: FEM Mesh information.
                Mesh Type:                                          Solid Mesh
                Mesher Used:                                        Standard mesh
                Automatic Transition                                Off
                Smooth Surface:                                     On
                Jacobian Check                                      4 Points
                Element Size:                                       2.5 mm
                Tolerence:                                          0.125 mm
                Quality:                                            High
                Number of Element:                                  39560
                Number of nodes:                                    60231
                Time to complete mesh (hh; mm;ss)                   00.00.06
                Computer name:                                      NHZG_XX

*Corresponding author (K.Prakobkarn). Tel/Fax: +66-2-5644482. E-mail address:
kuson@tu.ac.th     2012. International Transaction Journal of Engineering, Management, &
Applied Sciences & Technologies. Volume 3 No.2        ISSN 2228-9860      eISSN 1906-9642.
                                                                                             121
Online Available at http://TuEngr.com/V03/111-123.pdf.
Table 4: Study Results.
           Type                         Min                               Location    Max
       VON :Von                0.0222 N/mm2 (MPa)                  (7.35e-016mm,      28
       Misses Stress                                               33.0714mm, 61mm)


4. Results and Discussion 
    A prototype of the beach cleaning trailer was designed and fabricated. The machine
dimensions are (width x length) 1,100x 3,700 millimeters. The beach cleaning trailer can
operate at a maximum speed of about 6 kilometers per hour and the collecting capacity is 120
kilograms per hour of continuous operation. The engine speed is about 1600 rpm and the
corresponding fuel consumption rate is 9.52 liters per hour. The 13.43kg litter carried from
front conveyor toward the shaking sand tray will take 6.35minutes. The φ3 inch driver pulley
speed is 185.6 rpm. The transmission system is transmitted by two vee belt. The diameter of
12 inch driven pulley speed has average speed of 141 rpm, the oscillating cam shakes the
shaking sand tray with 47 strokes per minute.


    From the field experiment, it is found that the reel of blade (Figure 4) has two
disadvantages. First, speed is too low. Second, shape of the blade should be more fingerlike
in order to increase trash picking efficiency.


5. Conclusions 
    A stress analysis made using the forces acting on the ball bearing housing showed the
maximum Von Mises stress of the ball bearing housing to be 63.0 MPa. The safety factor
was 3.94. It showed that it was very durable to use. For the future work, economic analysis
should be performed to develop and design a fully mechanized beach cleaning machine. The
designed and developed beach cleaning trailer was quite appropriated to be used due to
utilizing of local materials, with reel of blade enhancement.


6. Acknowledgement 
    The author is grateful to Thammasat research fund for providing opportunity and budget
for this research.




    122              Kuson prakobkarn,Banyat Saitthiti, Sakda Intharavichai.
7. References 
Saensuk municipality. [On line ] www.saensukcity.com 10 July 2008.
Dechamphai, P and Phongthanapanich, S. (2007), Easy Finite Element Method with Software.
      Chulalongkorn University Press. Bangkok. 361p.
ASAE. (2000) (American Society of Agricultural Engineers, Standards. Agricultural
     Machinery Management.
Logan, Daryl L. (2002). A first course in the Finite Element Method.Third Edition
      Brooks/Cole , United States of America.
Rao, Singiriresu S. (2005) The Finite Element Method in Engineering. Fourth Edition.
      Elsevier Butterworth-Heinemann. United States of America. 663 p.
Chou, P.C. and Pagaro, J.N. (1967) Elasticity tensor, Dyadic and Engineering Approaches.
      Dover publication, Inc.,290 p. New York.
Beer, Gernot. (2001) Programming the Boundary Element Method An Introduction for
      Engineers.John Wiley & sons Ltd. Great Britain.457 p.
Supakorn, A. (1992) Chain Driver Gear Failure Analysis by Finite Element Method. Master
      of Engineering, Department of Mechanical Engineering, Kasetsart University.
Shigiey,J. E., Mischke, C.R., and Budynas, R.G .(2004) Mechanical Engineering Design 7th
       Ed. table A-S p.963.John Wiley & Sons, Inc.,
Prakobkarn, K.(2010) Bearing Housing Stress Analysis using the Solid works and Cosmos
      works .


                K.Prakobkarn is an Associate Professor in Department of Rural Technology, Faculty of Science and
                Technology, Thammasat University, Rangsit Campus, Pathumtani , Thailand. His teaching is in the areas
                of Farm mechanics and Agriculture. He interests involve biomass, Irrigation and Farm machinery
                research.



                Dr. Banyat Saitthiti earned his D.Ing (Science Agronomiques) from Institut National Agronomique
                Paris-Grignon. He is currently an Associate Professor, Kasetsart University. He works in the area of
                Farm machinery and Irrigation.




                Dr. Sakda Intharavichai is an Associate Professor in the Crop processing. He holds a Ph.D. from
                University Pertanian Malaysia. His teaching is in areas of crop processing. He is also very active in crop
                processing and computer modeling and simulation.




Peer Review: This article has been internationally peer-reviewed and accepted for publication
                according to the guidelines given at the journal’s website.

*Corresponding author (K.Prakobkarn). Tel/Fax: +66-2-5644482. E-mail address:
kuson@tu.ac.th     2012. International Transaction Journal of Engineering, Management, &
Applied Sciences & Technologies. Volume 3 No.2        ISSN 2228-9860      eISSN 1906-9642.
                                                                                                               123
Online Available at http://TuEngr.com/V03/111-123.pdf.

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Design and Construction of Beach Cleaning Trailer by Finite Element Method

  • 1. 2012 International Transaction Journal of Engineering, Management, & Applied Sciences & Technologies. International Transaction Journal of Engineering, Management, & Applied Sciences & Technologies http://www.TuEngr.com, http://go.to/Research Design and Construction of Beach Cleaning Trailer by Finite Element Method a* b b Kuson Prakobkarn , Banyat Saitthiti , Sakda Intaravichi a Department of Rural Technology Faculty of Science and Technology, Thammasat University, THAILAND b Department of Farm Mechanics Faculty of Agriculture, Kasetsart University, THAILAND ARTICLEINFO A B S T RA C T Article history: The design of a beach cleaning trailer is presented. The Received 23 September 2011 Received in revised form basic design principle of a foreign beach cleaning machine was 12 February 2012 taken into consideration. Apart from the tire and hydraulic hoses, Accepted 13 February 2012 all components of the beach cleaning trailer were made from Available online 14 February 2012 steel. This study focuses on stress analysis in the ball bearing Keywords: housing by the finite element method. Actual tests have been Stress, carried out in fields. This study aims to report the performance of Bearing housing, the beach cleaning trailer. Stresses in the ball bearing housing are Beach cleaning Trailer, calculated by FEM. Finite element method. 2012 International Transaction Journal of Engineering, Management, & Applied Sciences & Technologies 1. Introduction  Many beaches in Thailand are tourist attractions. Large number of tourists visit these beaches but they also deposits a large amount of garbage that local officers must collect and transport them to garbage dumping area at a very high cost. This work tried to solve problem by conducting field test at Bang saen beach, a 5 km long coastline sea located on Chonburi province (www.saensukcity.com). During January to October each year, authorities normally have problems with garbage on the sand about 10 cubic meters per day. In the rainy season, wind storms blow landward taking plastic bags, young coconut etc., all over the beach areas. *Corresponding author (K.Prakobkarn). Tel/Fax: +66-2-5644482. E-mail address: kuson@tu.ac.th 2012. International Transaction Journal of Engineering, Management, & Applied Sciences & Technologies. Volume 3 No.2 ISSN 2228-9860 eISSN 1906-9642. 111 Online Available at http://TuEngr.com/V03/111-123.pdf.
  • 2. Junks came with the water flow from Bangpakong river to the coastal of Saensuk municipality, have been trapped by installing the waste trap buoy 5 km away from the seashore which help to prevent some wastes getting to the beach. Now it has been long used and got damaged. So Saensuk municipality had imported beach trash collection trailers. But now they can not be used it because of lack of necessary spare parts that must be ordered from abroad. For example, the belt conveyor is out of order due to rubbing out on the side of trailer because the seashore has slope and not smooth. Saensuk municipality officials used the loader tractor and tractor attacking with the rake to clean and collect garbages on coastal sea in the morning, but paying high expenses. Based upon these reasons, beach cleaning trailer have been designed and fabricated such that it is suitable for various beach terrains and used local materials. Specially, as it is found that ball bearings are frequently got damaged, therefore the ball bearing housing failures have been studied and analyzed using Finite Element Method (FEM) (Dechamphai and Phongthanapanich, 2007). 1.1 Objectives of the research  Main objectives of this study are 1. Study, collect and analyze related materials and data of the existing beach trailer in order to be used as a basis for the design and development of the beach cleaning trailer. 2. Design an appropriate beach cleaning trailer prototype for an effectively utilization in Thailand, and 3. Fabricate a beach cleaning trailer prototype according to the mechanical study and design. Figure 1: Beach Cleaning Trailer Prototype -1. transporting and shaking sand system 2. Transmisssion conveyor 3. Shaking sand tray 4. Hydraulic system 5.Ball bearing 6. Trash tray 7.Back hydraulic system 8.Reel of blade. 112 Kuson prakobkarn,Banyat Saitthiti, Sakda Intharavichai.
  • 3. 2. Design of a beach cleaning trailer  A beach cleaning trailer prototype as shown in Figure 1 was design by using a Solid Works program. Designed details of beach cleaning trailer prototype can be detailed in subtopics. 2.1 Design of transporting and shaking system  The design of transporting and shaking system of the beach cleaning trailer prototype as shown in Figure 1 comprises of major components as follows: 1. Conveyor system: Conveyor belt was designed to transport the trash and send into the shaking tray and collect in trash bin as shown in Figure 1. 2. Transmission conveyor: Transmission conveyor was designed to transmit the power from PTO though gearbox and chain. 3. Shaking sand tray: Shaking tray was designed to separate and remove the associated trashed from the sand. The shaking tray was installed after the conveyor. 4. Hydraulic system: Hydraulic system through the by hydraulic cylinders were designed and utilized to actuate and control of lifting up and down the conveyor system and compressing the can in the bin and there is hydraulic motor for driving a reel of 16 blade with speed 20 revolution per minute. 2.2 Design of transmission system  Transmission system of the beach cleaning trailer was designed basically using gear box, belt and chain and motor hydraulic 1. Gearbox: Gear box was designed to reduce the speed of PTO and transmission of the driver of shaft of beach cleaning trailer 2. Belt: Belt is used to transmit power from gear box which ratio is 1: 60, turn left to the conveyor sprocket. 2.3 Fuel consumption rate  A fuel consumption equation for a specific operation is determined by total tractor power for that operation and the equivalent PTO power is devided by the rated maximum to get a percent load for the engine. The fuel consumption at that load is obtained from ASAE D497, clause3 (ASAE, 2000) *Corresponding author (K.Prakobkarn). Tel/Fax: +66-2-5644482. E-mail address: kuson@tu.ac.th 2012. International Transaction Journal of Engineering, Management, & Applied Sciences & Technologies. Volume 3 No.2 ISSN 2228-9860 eISSN 1906-9642. 113 Online Available at http://TuEngr.com/V03/111-123.pdf.
  • 4. = x PTotal (1) Where: FEC = Estimated fuel consumption for a particular operation, L/h. Fspc = Specific fuel consumption for the given tractor, determined From ASAE D497, clause3, L/kWh PTotal = Total tractor power(PTO equivalent) for the particular operation kW( 1hp = 0.74 kW ) 2.4 Stress analysis by using finite element method  Finite element analysis is first presented by creating differential equation and the appropriate boundary condition. It has to derive the body into an equivalent system of finite elements with associated modes and choosing the most appropriate element type to model most closely the actual physical behavior (Logan, 2002). On the basis that the equation must be consistent with the equations of the problem, then the element equations are combined to obtain the total equations in the matrix forms. The size of matrix is depend on dividing element of model, and solve the global equation Boundary conditions are then applies and the set of simultaneous equations are solved for the generalized displacement unknown by Mathematical model (Logan, 2002). 2.4.1 Strain – displacement relation  The strains induced in the body can be expressed in terms of the displacement u,v,w, respectively. In general, each of these components u,v,w is a function of coordinates x,y, and z. The strains induced in the body can be expressed in terms of displacements u,v,w and can be found as (Supakorn, 1992). ε , , , , , (2) where , ε , ε is normal strain and , , is shear strain respectively. If the displacements are assumed to be small. When the body undergoes deformation under the the action of external load ,the strain- displacement relation can be derived as( Chou, P.C. and Pagaro, J.N,1967) 114 Kuson prakobkarn,Banyat Saitthiti, Sakda Intharavichai.
  • 5. (3) 2.4.2 Constitutive equation  If the material is linearly elastic and isotropic. The relationship between the stress and strain is given by generized Hooke’s law. For an isotropic material, this is in three (Shigiey,J. E., Mischke, C.R., and Budynas, R.G ,2004) ν ν (4) ν And τ G (5) G τ G Where E is the modulus of elasticity, ν the Poisson’s ratio and G the shear modulus, given as (6) ν Equation can be written in a compact matrix (7) Where matrix D is defined as symmetric material matrix (Beer, 2001) (8) *Corresponding author (K.Prakobkarn). Tel/Fax: +66-2-5644482. E-mail address: kuson@tu.ac.th 2012. International Transaction Journal of Engineering, Management, & Applied Sciences & Technologies. Volume 3 No.2 ISSN 2228-9860 eISSN 1906-9642. 115 Online Available at http://TuEngr.com/V03/111-123.pdf.
  • 6. For ball bearing housing, stress analysis can be simply obtained using finite element method. The static loads are applied according to the Octahedral stress theory (Von Mises) predicting the yield strengths under all conditions. The Von Mises stress equation is 1 1 2 2 2 2 σVon Mises = σ1 -σ2 + σ2 -σ3 + σ3 -σ1 (11) √3 3. Analytical Results of Bearing Housing Stress  Conveyor structure is made of carbon steel and cast iron. Their unit weights are Carbon steel 76.5 kN/m3 Cast iron 70.6 kN/m3(Shigiey,J. E., Mischke, C.R., and Budynas, R.G .2004) 3.1 Garbage transporting structure  Figure 2: Garbage transporting structure Garbage transporting structure is exhibited in Figure 2. It weight is calculated as given in Table 1. 3.2 Conveyor Unit  Conveyor unit in Figure 3 is used to carry trash from beach area into shaking tray unit. Reel of blade in Figure 4 is installed upfront of the conveyor unit. Weights of conveyor unit are elaborated and totalized in Table 1. Figure 3: Conveyor unit. (Prakobkarn, 2010) 116 Kuson prakobkarn,Banyat Saitthiti, Sakda Intharavichai.
  • 7. Figure 4: Reel of blade. (Prakobkarn, 2010) Table 1: Total weight of all structural parts and a conveyor unit. Density Volume g Weight Weight Description (kg/ m3) (m3) (m/s2) (kg) (N) 1. Garbage transporting structure 76.5 0.018 - 1,377 2. Conveyor Unit 2.1 Weight of L-shape steel - - 9.81 197 ( 20 kg ) 2.2 Mesh conveyor + driver chain - - 9.81 197 ( 20 kg ) 2.3 Shaft weight 2 set 76.5 0.0011 - 168 2.4 Plastic wheel 2 set 9.81 5 98.1 2.5 ball bearing weight 4 set 70.6 0.0002 - - 56.48 2.7 driver pulley 70.6 0.0002 - - 14.12 2.8 Sweeping shaft 76.5 0.0024 - - 183.6 0.00005 2.9 Small pulley (3in diameter) 70.6 - - 3.74 3 2.10 Big pulley (12in diameter) 70.6 0.00026 - - 18.36 2.11 Sweeping shaft cover 76.5 0.00027 - - 20.7 2.12 Sweeping ball bearing 2 set 70.6 0.00014 - - 19.76 Total all weight 2,353.86 *Corresponding author (K.Prakobkarn). Tel/Fax: +66-2-5644482. E-mail address: kuson@tu.ac.th 2012. International Transaction Journal of Engineering, Management, & Applied Sciences & Technologies. Volume 3 No.2 ISSN 2228-9860 eISSN 1906-9642. 117 Online Available at http://TuEngr.com/V03/111-123.pdf.
  • 8. Using all weight from Table 1, there are three points to support the conveyor unit, attaching hydraulic point and two both sides of ball bearings. Each point gets equal average weight according to the force equal 2,353.86N / 3 = 784.62 N. Sand friction against to ball bearing housing is shown in Figure 5. Figure 5: Sand friction force against to ball bearing housing It is estimated that sand friction force to the conveyor structure equals to 556.25 N/in width (125 lb/in). Figure 6: Width of conveyor structure. Width of conveyor structure (Figure 6) is touching with sand = 1,110 mm or 43.70 in Thus; Force against conveyor unit = 133.5N/in. Width x 43.70 in = 5833.95 N 118 Kuson prakobkarn,Banyat Saitthiti, Sakda Intharavichai.
  • 9. Figure 7: Sand friction force against conveyor unit. Having conveyor tilt angle 18.26 degrees with flat area, acting force can be obtained as 5,833.95 N (cos 18.26°) = 5540.18 N. Sand friction acts to three areas such as hydraulic attaching area and both side of ball bearing housing. For simplicity, it is assumed that the hydraulic cylinder force acts only in horizontal. The force with 18.26 degree tilt angle act to ball bearing housing both of them equal to 5,540.18 N/2 = 2770.09 N. Ball bearing housing is failure due to sand friction force against to conveyor structure because the quantity of force is greater than conveyor weight. With material properties given in Tables 2 and 3, the FEM results can be visually seen in Figures 8-13 and Von Misses Stress is given in Table 4. Figure 8: Sand resistance force against to ball bearing housing Figure 9: Color fringe plot of the Von Mises stress distributions the maximum is 63.0 MPa *Corresponding author (K.Prakobkarn). Tel/Fax: +66-2-5644482. E-mail address: kuson@tu.ac.th 2012. International Transaction Journal of Engineering, Management, & Applied Sciences & Technologies. Volume 3 No.2 ISSN 2228-9860 eISSN 1906-9642. 119 Online Available at http://TuEngr.com/V03/111-123.pdf.
  • 10. Figure 10: Finite element mesh on bearing housing Figure11: Maximum displacement equal to 1.832 e-002 mm Figure 12: Maximum strain equal to 2.053 e-004 120 Kuson prakobkarn,Banyat Saitthiti, Sakda Intharavichai.
  • 11. Figure 13: Minimum safety factor equal to 3.94 Table 2: Material & Engineering Properties of used bearing. Material type: Cast Carbon Steel Material Model Type: Linear Elastic Isotropic Default failure Criterion Max Von Mises Stress Mass 0.678171kg Volume 8.694512 e-005 Elastic modulus 2e+011 N/m2 Poisson’s ratio 0.32 NA Shear modulus 7.6e+010 N/m2 Mass density 7800 Kg/m3 Tensile strength 4.825e+008 N/m2 Yield strength 2.4817e+008 N/m2 Thermal expansion coefficient 1.2e-0051/Kelvin Thermal conductivity 30 W/(m.K) Specific heat 500 J/(kg.K) Table 3: FEM Mesh information. Mesh Type: Solid Mesh Mesher Used: Standard mesh Automatic Transition Off Smooth Surface: On Jacobian Check 4 Points Element Size: 2.5 mm Tolerence: 0.125 mm Quality: High Number of Element: 39560 Number of nodes: 60231 Time to complete mesh (hh; mm;ss) 00.00.06 Computer name: NHZG_XX *Corresponding author (K.Prakobkarn). Tel/Fax: +66-2-5644482. E-mail address: kuson@tu.ac.th 2012. International Transaction Journal of Engineering, Management, & Applied Sciences & Technologies. Volume 3 No.2 ISSN 2228-9860 eISSN 1906-9642. 121 Online Available at http://TuEngr.com/V03/111-123.pdf.
  • 12. Table 4: Study Results. Type Min Location Max VON :Von 0.0222 N/mm2 (MPa) (7.35e-016mm, 28 Misses Stress 33.0714mm, 61mm) 4. Results and Discussion  A prototype of the beach cleaning trailer was designed and fabricated. The machine dimensions are (width x length) 1,100x 3,700 millimeters. The beach cleaning trailer can operate at a maximum speed of about 6 kilometers per hour and the collecting capacity is 120 kilograms per hour of continuous operation. The engine speed is about 1600 rpm and the corresponding fuel consumption rate is 9.52 liters per hour. The 13.43kg litter carried from front conveyor toward the shaking sand tray will take 6.35minutes. The φ3 inch driver pulley speed is 185.6 rpm. The transmission system is transmitted by two vee belt. The diameter of 12 inch driven pulley speed has average speed of 141 rpm, the oscillating cam shakes the shaking sand tray with 47 strokes per minute. From the field experiment, it is found that the reel of blade (Figure 4) has two disadvantages. First, speed is too low. Second, shape of the blade should be more fingerlike in order to increase trash picking efficiency. 5. Conclusions  A stress analysis made using the forces acting on the ball bearing housing showed the maximum Von Mises stress of the ball bearing housing to be 63.0 MPa. The safety factor was 3.94. It showed that it was very durable to use. For the future work, economic analysis should be performed to develop and design a fully mechanized beach cleaning machine. The designed and developed beach cleaning trailer was quite appropriated to be used due to utilizing of local materials, with reel of blade enhancement. 6. Acknowledgement  The author is grateful to Thammasat research fund for providing opportunity and budget for this research. 122 Kuson prakobkarn,Banyat Saitthiti, Sakda Intharavichai.
  • 13. 7. References  Saensuk municipality. [On line ] www.saensukcity.com 10 July 2008. Dechamphai, P and Phongthanapanich, S. (2007), Easy Finite Element Method with Software. Chulalongkorn University Press. Bangkok. 361p. ASAE. (2000) (American Society of Agricultural Engineers, Standards. Agricultural Machinery Management. Logan, Daryl L. (2002). A first course in the Finite Element Method.Third Edition Brooks/Cole , United States of America. Rao, Singiriresu S. (2005) The Finite Element Method in Engineering. Fourth Edition. Elsevier Butterworth-Heinemann. United States of America. 663 p. Chou, P.C. and Pagaro, J.N. (1967) Elasticity tensor, Dyadic and Engineering Approaches. Dover publication, Inc.,290 p. New York. Beer, Gernot. (2001) Programming the Boundary Element Method An Introduction for Engineers.John Wiley & sons Ltd. Great Britain.457 p. Supakorn, A. (1992) Chain Driver Gear Failure Analysis by Finite Element Method. Master of Engineering, Department of Mechanical Engineering, Kasetsart University. Shigiey,J. E., Mischke, C.R., and Budynas, R.G .(2004) Mechanical Engineering Design 7th Ed. table A-S p.963.John Wiley & Sons, Inc., Prakobkarn, K.(2010) Bearing Housing Stress Analysis using the Solid works and Cosmos works . K.Prakobkarn is an Associate Professor in Department of Rural Technology, Faculty of Science and Technology, Thammasat University, Rangsit Campus, Pathumtani , Thailand. His teaching is in the areas of Farm mechanics and Agriculture. He interests involve biomass, Irrigation and Farm machinery research. Dr. Banyat Saitthiti earned his D.Ing (Science Agronomiques) from Institut National Agronomique Paris-Grignon. He is currently an Associate Professor, Kasetsart University. He works in the area of Farm machinery and Irrigation. Dr. Sakda Intharavichai is an Associate Professor in the Crop processing. He holds a Ph.D. from University Pertanian Malaysia. His teaching is in areas of crop processing. He is also very active in crop processing and computer modeling and simulation. Peer Review: This article has been internationally peer-reviewed and accepted for publication according to the guidelines given at the journal’s website. *Corresponding author (K.Prakobkarn). Tel/Fax: +66-2-5644482. E-mail address: kuson@tu.ac.th 2012. International Transaction Journal of Engineering, Management, & Applied Sciences & Technologies. Volume 3 No.2 ISSN 2228-9860 eISSN 1906-9642. 123 Online Available at http://TuEngr.com/V03/111-123.pdf.