How doI solve the problems(Model not assembled:position violation) with this quater car model?

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Shuo Wang 2016-7-7

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评论： Pablo Beattie 2018-12-11

suspnension SimMechanics part model.zip

Dear sir When I follow the tutorial of the formula student physical training videos(Part 9: Building Mechanical Assemblies, Section 2), I have some problems. The model does not run well after I add the calculate force Subsystem and connect the Test Force system to the wheel subsystem. The problems shown by Matlab said the problems were caused by : Error using sm.sli.internal.sim (line 15) * ['chassis']: * Model not assembled: position violation * Resolve this issue in order to simulate the model. The model report shows that Test_force_subsystem.Planar_joint is unassembled and the Shock_absorber.Prismatic_Joint is also wrong.However, the model runs well before I added the force calculate subsystem. Hope you can help with my problem.I really want to know what problems I've made. I attached my model in the Zip file. Another problem is that the setting of the Shock absorber might have problems as well.The scope of the SA shows that the sping just extended without damping.What problem might that be?

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Shuo Wang 2016-7-11

One more thing, before I added the force calculation subsystem, I set the internal mechanics in the Shock absorber. However, the scope shows that the sping just extended without damping. Would the problem happend at there?

Pablo Beattie 2018-12-11

no tengo ni puta idea bro

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Answer 1

Shuo Wang 2016-7-11

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I finally solved the problem, the platform to wheel rigid transform block was wrong. A rotation has been added to correct the location of the planar joint of the contact point. Now the problems has been solved. However, after I finish the input of the wheel, the scope of the Shock absorber seems wrong. I'll upload the new model and upload a new question, hope anybody can tell me what is wrong. I already set the internal mechanics in the prismatic joint, but it seems like the setting of internal mechanics of SA doesn't work.

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Swarooph 2016-7-12

Sorry about the delay. Yes you are correct. The Platform to Wheel transform should have the following transformation specified.

Like you said, if you have another question, please post a new one. Please also post screenshots and tell us what is wrong and what it was that you expected.

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