I am trying to model a mechanism of excavators in the Simscape multibody.
I am using prismatic joint to simulate the functionality of hydraulic jacks with the following settings:

I motion the hydraulic jacks (using PS Ramp bock) and track the sensed "actuator force" parameter via a scope block.
So technically, I am doing an Inverse dynamic analysis to calculate the needed force on the hydraulic jacks and because during my simulation, all of the jacks (modeled with Prismatic joints) are getting opened, I am expecting that all the actuator forces be positive; however, the sign of force is changing over the simulation (!) which I believe it is wrong as I set to the motion of prismatic joints in one direction and the actuator force should be along this direction too. So I was wondering, why this is happening?!I am trying to model a mechanism of excavators in the Simscape multibody.
I am using prismatic joint to simulate the functionality of hydraulic jacks with the following settings:

I motion the hydraulic jacks (using PS Ramp bock) and track the sensed "actuator force" parameter via a scope block.
So technically, I am doing an Inverse dynamic analysis to calculate the needed force on the hydraulic jacks and because during my simulation, all of the jacks (modeled with Prismatic joints) are getting opened, I am expecting that all the actuator forces be positive; however, the sign of force is changing over the simulation (!) which I believe it is wrong as I set to the motion of prismatic joints in one direction and the actuator force should be along this direction too. So I was wondering, why this is happening?! I am trying to model a mechanism of excavators in the Simscape multibody.
I am using prismatic joint to simulate the functionality of hydraulic jacks with the following settings:

I motion the hydraulic jacks (using PS Ramp bock) and track the sensed "actuator force" parameter via a scope block.
So technically, I am doing an Inverse dynamic analysis to calculate the needed force on the hydraulic jacks and because during my simulation, all of the jacks (modeled with Prismatic joints) are getting opened, I am expecting that all the actuator forces be positive; however, the sign of force is changing over the simulation (!) which I believe it is wrong as I set to the motion of prismatic joints in one direction and the actuator force should be along this direction too. So I was wondering, why this is happening?! simscape, inverse dynamic, prismatic joint, actuated force, hydraulic jack MATLAB Answers — New Questions

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