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Using simulation tools for improvement of small home appliances design

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Using simulation tools for improvement of small home appliances design

  1. 1. B S H H O M E A P P L I A N C E S G R O U P Using simulation tools for improvement of small home appliances design Ansys Convergence Conference 2016 25th May 2016 dr. Henri Orbanić, Marko Žilnik
  2. 2. B S H H O M E A P P L I A N C E S G R O U P Using simulation tools for improvement of small home appliances design | 25th May 2016 | Slide: 2 ©BSHHišniaparatid.o.o.Nazarje,2016 About BSH HOME APPLIANCE GROUP  Founded in 1967 as a joint venture between Siemens AG and Robert Bosch GmbH  Since the beginning of 2015 BSH fully belongs to the Bosch Group  Market leader in Europe, No. 2 in the world  Product portfolio: all modern home appliances  Employees worldwide: 56,500  Around 3,500 R&D specialists in BSH’s international production and development network BSH Hausgeräte GmbH Founded in 1967 Robert Bosch GmbH 100%
  3. 3. B S H H O M E A P P L I A N C E S G R O U P Using simulation tools for improvement of small home appliances design | 25th May 2016 | Slide: 3 ©BSHHišniaparatid.o.o.Nazarje,2016 BSH’s product portfolio covers the entire spectrum for daily life
  4. 4. B S H H O M E A P P L I A N C E S G R O U P Using simulation tools for improvement of small home appliances design | 25th May 2016 | Slide: 4 ©BSHHišniaparatid.o.o.Nazarje,2016 Short presentation of BSH Hišni aparati d.o.o Nazarje, Slovenia  ~1200 employees  ~7 million appliances produced per year Two branches:  Food preparation  Beverages preparation
  5. 5. B S H H O M E A P P L I A N C E S G R O U P Using simulation tools for improvement of small home appliances design | 25th May 2016 | Slide: 5 ©BSHHišniaparatid.o.o.Nazarje,2016 Products developed and produced in Nazarje – Food preparation Food processors Kitchen machines Stick mixers Hand blenders Blenders Juicers Citrus pressChoppersMeat grinders
  6. 6. B S H H O M E A P P L I A N C E S G R O U P Using simulation tools for improvement of small home appliances design | 25th May 2016 | Slide: 6 ©BSHHišniaparatid.o.o.Nazarje,2016 Using ANSYS in Food preparation department  Personnel: two part-time simulation engineers  Hardware: – Two simulation workstations Dell T7910 with 16-cores each  Software: – Structural analysis: – ANSYS Mechanical (Static structural, Transient structural, Modal, Thermal) – ANSYS Explicit STR (Impact testing) – CFD analysis: – ANSYS Fluent
  7. 7. B S H H O M E A P P L I A N C E S G R O U P Using simulation tools for improvement of small home appliances design | 25th May 2016 | Slide: 7 ©BSHHišniaparatid.o.o.Nazarje,2016 Structural analysis simulation in BSH Hišni aparati d.o.o. Nazarje
  8. 8. B S H H O M E A P P L I A N C E S G R O U P Using simulation tools for improvement of small home appliances design | 25th May 2016 | Slide: 8 ©BSHHišniaparatid.o.o.Nazarje,2016 Stick mixer drop test  The user has to be prevented from touching live electronics if the appliance is damaged after it is accidentally dropped on the floor.  Thus the appliance housing must not open if it falls from the kitchen counter.  One of our stick mixers had problems with this test.  The goal was to have a solution which would be cheap and easy to implement as the modifications to the moulding tools are expensive. High speed camera – 1900 fps t=0 t=2,63 ms t=4,74 ms
  9. 9. B S H H O M E A P P L I A N C E S G R O U P Using simulation tools for improvement of small home appliances design | 25th May 2016 | Slide: 9 ©BSHHišniaparatid.o.o.Nazarje,2016 Simulation setup Cross section Mass to simulate motor and electronics Gravity + initial velocity Fixed floor Housing material: ABS
  10. 10. B S H H O M E A P P L I A N C E S G R O U P Using simulation tools for improvement of small home appliances design | 25th May 2016 | Slide: 10 ©BSHHišniaparatid.o.o.Nazarje,2016 The existing situation  The simulation was performed in ANSYS Explicit STR.  First the simulation of the existing situation was performed.  The simulation showed similar opening of housing as in real drop. Thus we could proceed to modifying of housing design.
  11. 11. B S H H O M E A P P L I A N C E S G R O U P Using simulation tools for improvement of small home appliances design | 25th May 2016 | Slide: 11 ©BSHHišniaparatid.o.o.Nazarje,2016 Solution  After the modification of locks the housing did not open anymore
  12. 12. B S H H O M E A P P L I A N C E S G R O U P Using simulation tools for improvement of small home appliances design | 25th May 2016 | Slide: 12 ©BSHHišniaparatid.o.o.Nazarje,2016 Drop test of packed appliances  Software: Before - outsourcing LS-DYNA, Now – ANSYS Explicit STR  Lateral drop test from the height of 50 cm, v0 = 3,13 m/s, angle to the ground 10° 10°
  13. 13. B S H H O M E A P P L I A N C E S G R O U P Using simulation tools for improvement of small home appliances design | 25th May 2016 | Slide: 13 ©BSHHišniaparatid.o.o.Nazarje,2016 Drop test - plastic strain analysis
  14. 14. B S H H O M E A P P L I A N C E S G R O U P Using simulation tools for improvement of small home appliances design | 25th May 2016 | Slide: 14 ©BSHHišniaparatid.o.o.Nazarje,2016 Bosch MUM5 blender locking mechanism structural problem  Problem: the geometry and material was changed. During usage the locking mechanism broke.  The problem was solved by the design change .
  15. 15. B S H H O M E A P P L I A N C E S G R O U P Using simulation tools for improvement of small home appliances design | 25th May 2016 | Slide: 15 ©BSHHišniaparatid.o.o.Nazarje,2016 CFD simulation in BSH Hišni aparati d.o.o. Nazarje
  16. 16. B S H H O M E A P P L I A N C E S G R O U P Using simulation tools for improvement of small home appliances design | 25th May 2016 | Slide: 16 ©BSHHišniaparatid.o.o.Nazarje,2016 Stick mixer performance analysis water level pressure outlet water rotation zone air
  17. 17. B S H H O M E A P P L I A N C E S G R O U P Using simulation tools for improvement of small home appliances design | 25th May 2016 | Slide: 17 ©BSHHišniaparatid.o.o.Nazarje,2016 Simulation parameters  Two phase water-air VOF model  High rotational velocity ~ 12000 rpm  turbulence  Transient formulation
  18. 18. B S H H O M E A P P L I A N C E S G R O U P Using simulation tools for improvement of small home appliances design | 25th May 2016 | Slide: 18 ©BSHHišniaparatid.o.o.Nazarje,2016 Mixing analysis  Inserting tracer liquid and observing the uniformity of mixing
  19. 19. B S H H O M E A P P L I A N C E S G R O U P Using simulation tools for improvement of small home appliances design | 25th May 2016 | Slide: 19 ©BSHHišniaparatid.o.o.Nazarje,2016 Bosch MCM6 food processor blender attachment
  20. 20. B S H H O M E A P P L I A N C E S G R O U P Using simulation tools for improvement of small home appliances design | 25th May 2016 | Slide: 20 ©BSHHišniaparatid.o.o.Nazarje,2016 Simulation parameters  Two phase water-air VOF model  0.75 l of water was simulated  Rotational velocity – 6000 to 12000 rpm,  Transient formulation
  21. 21. B S H H O M E A P P L I A N C E S G R O U P Using simulation tools for improvement of small home appliances design | 25th May 2016 | Slide: 21 ©BSHHišniaparatid.o.o.Nazarje,2016 Kneading bread dough  Bread dough – mainly mixture of wheat flower and water.  Depending on the flower-water ratio, the dough can be a dry plastic ball or a soft sticky mass.  Points of interest: – obtaining load regime on the machine, – studying the kneading process – kneading efficiency.
  22. 22. B S H H O M E A P P L I A N C E S G R O U P Using simulation tools for improvement of small home appliances design | 25th May 2016 | Slide: 22 ©BSHHišniaparatid.o.o.Nazarje,2016 THANK YOU FOR YOUR ATTENTION

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