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Active Member
derek_huang
Posts: 7
Registered: ‎11-06-2011

How to set up bicycle brakes?

496 Views, 7 Replies
12-05-2011 01:43 AM

Hi Support team

 

I want to simulate contact with a brake shoe brake pads behavior.

When the brake pads contact surface temperature of the simulation.

But my analysis of the results generated in the brake shoe on the temperature, can not be passed on to the brake pads.

Please refer to attachment

Please provide similar cases, to correspond to how to set up.

Please help answer

 

thank you

Please use plain text.
Alumni
marco.mueller
Posts: 35
Registered: ‎08-30-2011

Re: How to set up bicycle brakes?

12-05-2011 02:47 AM in reply to: derek_huang

Hello,

 

which software do you use?



Marco Müller
Product Support Specialist
Digital Simulation
Autodesk, Inc.
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Active Member
derek_huang
Posts: 7
Registered: ‎11-06-2011

Re: How to set up bicycle brakes?

12-05-2011 07:19 AM in reply to: marco.mueller

sorry~!!

I use the software is Autodesk Simulation CFD2012



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Alumni
marco.mueller
Posts: 35
Registered: ‎08-30-2011

Re: How to set up bicycle brakes?

12-05-2011 07:29 AM in reply to: derek_huang

I just wanted to verify this since it sounds a bit like a structural analysis and sometimes topics from this area pop up here.

 

Can you provide us more information about the setup: Materials, Boundary conditions.

 

Are you trying to perform a "2-step analysis"? Can you also provide detailed information about the steps you go through?

 

Thanks



Marco Müller
Product Support Specialist
Digital Simulation
Autodesk, Inc.
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Active Member
derek_huang
Posts: 7
Registered: ‎11-06-2011

Re: How to set up bicycle brakes?

12-05-2011 07:52 PM in reply to: marco.mueller

Hi Support team

 

Please refer to attachment

1. pdf

2..cfz

 

thank you

Please use plain text.
Alumni
marco.mueller
Posts: 35
Registered: ‎08-30-2011

Re: How to set up bicycle brakes?

12-06-2011 04:43 AM in reply to: derek_huang

Hello,

 

thanks for the submitted information. First of all I'd rather use a fixed (or time-variing) temperature boundary condition than a heat flux condition for this simulation.

 

Additionally there are a few factors which quantitativly improve the solution:

  • smaller time-step size.
  • smaller mesh size (at least for the contact surfaces). You may split up the huge brake surface to refine only the areas that touch the pad.

To safe calculation time you can model this brake simulation symmetrically (cut away half of the model).

 

And lastly some comments regarding the fluid flow setup (only mind them if you are interested in the natural convection effects):

 

  • allow the air density to be temperature dependent:
    06.12.png

  • tidy up the outer boundary conditions so that only the upper and lower surface have a pressure condition and the lower surface (supposed to be the inlet) has also the environment temperature:
    bcs.png

  • Specify the gravity direction:
    apfel.png

Let us know if this helps for your simulation.



Marco Müller
Product Support Specialist
Digital Simulation
Autodesk, Inc.
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Active Member
derek_huang
Posts: 7
Registered: ‎11-06-2011

Re: How to set up bicycle brakes?

12-08-2011 11:50 PM in reply to: derek_huang

Hi Support team

 

Thanks for your reply.

I tried to analysis, the results show that the temperature distribution is wrong.

Please refer to attachment.

 

thank you

Please use plain text.
Alumni
marco.mueller
Posts: 35
Registered: ‎08-30-2011

Re: How to set up bicycle brakes?

12-12-2011 05:56 AM in reply to: derek_huang

I have to correct my former post since I've missed the fact that we cannot calculate the heat conduction between multiple solids in a motion analysis. Only the heat transfer solid/fluid is taken into account.

 

What is the goal of this simulation? There may be other approaches to reach it.



Marco Müller
Product Support Specialist
Digital Simulation
Autodesk, Inc.
Please use plain text.