# RigidBodyDynamics - simulate multi link mechanism

**URL:** <https://discourse.julialang.org/t/rigidbodydynamics-simulate-multi-link-mechanism/75625>\
**Category:** Modelling & Simulations\
**Tags:** question\
**Created:** [February 2, 2022, 6:54am UTC](https://discourse.julialang.org/t/rigidbodydynamics-simulate-multi-link-mechanism/75625 "2022-02-02T06:54:51Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![kobied](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/kobied/32/16432_2.png) [@kobied](https://discourse.julialang.org/u/kobied)\
**Post date:** [February 2, 2022, 6:54am UTC](https://discourse.julialang.org/t/rigidbodydynamics-simulate-multi-link-mechanism/75625/1 "2022-02-02T06:54:51Z")

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Hello,  
I’m trying to simulate a multi-link mechanism.  
Based on the “double pendulum” example, I was able to define my mechanism, so far so good, my issue is this:  
In my dynamic simulation there are times when I need to lock some links one to the other, and at other times in need to release them.  
Can it be done?  
If so, please help.  
thanks in ahead  
kobi

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**Author:** ![ufechner7](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/ufechner7/32/51363_2.png) [@ufechner7](https://discourse.julialang.org/u/ufechner7)\
**Post date:** [February 3, 2022, 12:27am UTC](https://discourse.julialang.org/t/rigidbodydynamics-simulate-multi-link-mechanism/75625/2 "2022-02-03T00:27:04Z")

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Please provide your code, otherwise we cannot help you…