simscape.multibody.AxialSpringDamper Class

Namespace: simscape.multibody
Superclasses: simscape.multibody.JointForceLaw

Construct axial spring-damper force law

Since R2022a

Description

Use an object of the simscape.multibody.AxialSpringDamper class to construct an axial spring-damper force law. You can use the force law to apply a pure axial force to a simscape.multibody.PrismaticPrimitive object. The force is based on the current position and velocity of the primitive

$$F=-k_s·(p-p_0)-k_d\dot{p}$$,

where:

Symbol	Description
$$F$$	Applied axial force
$$p_0$$	Equilibrium position of the spring
$$k_s$$	Spring stiffness
$$k_d$$	Damping coefficient
$$p$$	Prismatic primitive position
$$\dot{p}$$	Prismatic primitive velocity

Class Attributes

Sealed	true
ConstructOnLoad	true
RestrictsSubclassing	true

For information on class attributes, see Class Attributes.

Creation

Description

asd = simscape.multibody.AxialSpringDamper constructs an axial spring-damper force law and sets the parameters to simscape.Value objects with a value of zero.

Properties

EquilibriumPosition — Equilibrium position of spring

simscape.Value(0,"m") (default) | simscape.Value(p₀,"Length unit")

Equilibrium position of the spring, specified as a simscape.Value object that represents a scalar with a unit of length. The scalar can be positive, negative, or zero. The axial spring force is zero when the primitive position is at the equilibrium position.

Example: simscape.Value(1,"mm")

Attributes:

GetAccess	public
SetAccess	public
NonCopyable	true

SpringStiffness — Stiffness of spring

simscape.Value(0,"N/m") (default) | simscape.Value(k_s,"Force/length unit")

Stiffness of the spring, specified as a simscape.Value object that represents a scalar with a unit of force/length. The scalar is a measure of how hard the spring pushes the primitive position toward the equilibrium position and must be nonnegative.

Example: simscape.Value(1,"N/m")

Attributes:

GetAccess	public
SetAccess	public
NonCopyable	true

DampingCoefficient — Damping coefficient of damper

simscape.Value(0,"N/(m/s)") (default) | simscape.Value(k_d,"Force/linear velocity unit")

Damping coefficient of the damper, specified as a simscape.Value object that represents a scalar with a unit of force/linear velocity. The scalar is a measure of how hard the damper resists the motion of a primitive and must be nonnegative.

Example: simscape.Value(1,"N/(m/s)")

Attributes:

GetAccess	public
SetAccess	public
NonCopyable	true

Version History

Introduced in R2022a