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Mass (PB)

Point mass with gravitational effects

Since R2024b

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  • Mass (PB) block

Libraries:
Simscape / Foundation Library / Translational / Elements

Description

The Mass (PB) block represents a point mass with gravitational effects that moves along an inclined rail. Gravity can induce motion along the rail. The force flow equations are:

facc=m⋅v˙

facc=f+fgp

fgp=−m⋅g⋅sin(θ)

where:

  • facc is force proportional to mass acceleration. Positive force accelerates the mass in the positive direction.

  • f is net force of the other mechanical components in the network acting on the mass.

  • fgp is force proportional to the parallel component of gravitational acceleration, that is, to the gravitational acceleration acting along the rail.

  • m is the mass.

  • v is the mass velocity.

  • g is the gravitational acceleration.

  • θ is the rail incline angle.

The Mechanical Translational Properties (PB) block specifies the gravitational acceleration and rail incline angle in the network. For more information, see Interpreting Logged Forces in Mass Blocks.

Variables

To set the priority and initial target values for the block variables prior to simulation, use the Initial Targets section in the block dialog box or Property Inspector. For more information, see Set Priority and Initial Target for Block Variables.

Nominal values provide a way to specify the expected magnitude of a variable in a model. Using system scaling based on nominal values increases the simulation robustness. Nominal values can come from different sources, one of which is the Nominal Values section in the block dialog box or Property Inspector. For more information, see Modify Nominal Values for a Block Variable.

Examples

Force Flow in the Position-Based Translational Domain

Force Flow in the Position-Based Translational Domain

Describes how to interpret forces in a Simscape™ position-based mechanical translational network. The example summarizes rules for interpreting the signs of logged forces and then considers forces in three types of systems: springs being pulled or pushed from different ends, simple systems with external forces applied at a mid-point, and a more complex system with an external force applied at the mid-point.

Gravity and Friction in the Position-Based Translational Domain

Gravity and Friction in the Position-Based Translational Domain

Configure gravity and gravity-induced friction effects in a position-based mechanical translational network.

Ports

Conserving

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Position-based mechanical translational conserving port that connects the mass to the physical network.

Parameters

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Mass value. The mass is constant during simulation.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2024b

See Also

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