limiting slider part motion distance of the prismatic joint in simulink

I want to limit the distance of the slider part which slides with a prismatic joint. for example I want it to slide 0.5 m to downward and come back to its initial position

Answer 1

[Subhajyoti]

Hello Sila,

The slider movement limits in a ‘prismatic joint’ can be tuned by configuring the following parameters.

For the Initial Position:

• ‘State Targets > Specify Position Target > Priority’ — Priority level of position target
• ‘State Targets > Specify Position Target > Value’ — Position target

For the Lower Limit:

• ‘Limits > Specify Lower Limit > Bound’ — Lower bound of free region

For the Upper Limit:

• ‘Limits > Specify Upper Limit > Bound’ — Upper bound of free region

The following steps can configure the model to the given example:

1. Double-click on the ‘Prismatic Joint 3’ block to open its parameters.
2. In the "Z Prismatic Primitive (Pz)" tab under the ‘State Targets’ sub-section, enable "Specify Position Target" and set the ‘value’ to 0 (initial position).
3. In the same tab under ‘Limits’, set the following parameters.
4. Enable the "Specify Upper Limit" and set the ‘Bound’ to 0 (if 0 is your initial position)
5. Enable the "Specify Lower Limit" and set the ‘Bound’ to -0.5 (for downward movement).

Note: Optionally, you can set the "Spring Stiffness" and "Damping Coefficient" parameters to define the behaviour of the joint when it reaches these limits.

Refer to the following MathWorks Documentation to understand more about ‘Prismatic Joint’.

https://www.mathworks.com/help/sm/ref/prismaticjoint.html

Hope the above information is helpful.