PLMPIV01 is a submodel of a revolute pair which computes explicitly x and y constraint forces using linear spring stiffness and damping coefficient.
The user has to enter the following real parameters corresponding to the x and y contact forces computation :
kx : x linear spring stiffness in [N/m]
bx : x linear damping coefficient in [N/(m/s)]
ky : y linear spring stiffness in [N/m]
by : y linear damping coefficient in [N/(m/s)]
As PLMPIV00 , torque around z axis is computed using two real parameters entered by the user:
kz : rotary spring stiffness in [Nm/degree]
bz : rotary damping coefficient in [Nm/(rev/min)]
The two forces due to spring models are calculated at ports 1 and 2 in x and y directions.
The main difference with PLMPIV00 submodel concern the use of contact forces instead of constraint equations. There are no more implicit variables. Stabilization of Baumgarte is no more used to compute the Lagrangian factors (indeed, no more constraint equation has to be expressed).
Usage
Use this submodel in replacement of PLMPIV00 to get rid of implicit variables created by constraint equations.
Always use this submodel with the assembly module, or on a model with correct body positions. Otherwise, the springs in x and y directions could abnormally be preloaded and generate huge contact forces.
PLMJ00 is a submodel of a translational actuator. The ports 1 and 3 are dedicated to the planar mechanical library while the port 2 is a linear 1D mechanical port.
The PLM ports can be connected to any body component or to the ground. The inputs on the PLM ports are velocities, positions and accelerations of the bodies. From this information, PLMJ00 calculates the relative velocity, position and acceleration of the actuator as outputs at port 2.
The linear mechanical port (port 2) can be connected to components generating a force. The input from this port is a force that is sent to the PLM ports.
Usage
PLMJ00 can be used to model a jack. It can be connected at port 2 to submodels such as a spring-damper of the standard mechanical library or a hydraulic actuator of the optional hydraulic library.