Chassis To Tree-Frame Motion

R2026b

Transform motion from chassis frame to rigid body tree frame

Since R2026b

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Chassis To Tree-Frame Motion block

To add a block to a model, double-click the canvas and start typing the block name. Then, select the block from the list.

Libraries:
Offroad Autonomy Library / Vehicle Utilities

Description

Add-On Required: This feature requires the Robotics System Toolbox Offroad Autonomy Library add-on.

The Chassis To Tree‑Frame Motion block transforms the velocities and accelerations of a chassis reference frame to a selected target frame on a rigid body tree in the right-handed world frame. You can use this block to get motion quantities at the sensor mounting locations of the vehicle, such as for IMUs, defined on a rigid body tree.

Ports

Input

Chassis Velocity — Angular and linear velocities in chassis coordinate frame

vector

Angular and linear velocities in the chassis coordinate frame, specified as a six-element column vector of the form [ωy; ωp; ωr; vx; vy; vz]. Angular velocity values are in radians per second and linear velocity values are in meters per second.

Chassis Acceleration — Angular and linear accelerations in chassis coordinate frame

vector

Angular and linear accelerations in the chassis coordinate frame, specified as a six-element column vector of the form [αy; αp; αr; ax; ay; az]. Angular acceleration values are in radians per second squared and linear acceleration values are in meters per second squared.

Joint Configuration — Joint configuration vector of rigid body tree

vector

Joint configuration vector of the rigid body tree, specified as an N-element vector. N is the total number of nonfixed joint degrees of freedom on the rigid body tree.

Base Rotation — Rotation of rigid body tree base frame

matrix

Rotation of the rigid body tree base frame, specified as a 3-by-3 rotation matrix in the right-handed world frame.

Output

Target Frame Velocity — Target frame angular and linear velocities in world coordinate frame

vector

Target frame angular and linear velocities in the world coordinate frame, returned as a six-element column vector of the form [ωy; ωp; ωr; vx; vy; vz]. Angular velocity values are in radians per second and linear velocity values are in meters per second.

Target Frame Acceleration — Target frame angular and linear accelerations in world coordinate frame

vector

Target frame angular and linear accelerations in the world coordinate frame, returned as a six-element column vector of the form [αy; αp; αr; ax; ay; az]. Angular acceleration values are in radians per second squared and linear acceleration values are in meters per second squared.

Target Rotation — Rotation of target frame

matrix

Rotation of the target frame, returned as a 3-by-3 rotation matrix in the right-handed world frame.

Parameters

To edit block parameters interactively, use the Property Inspector. From the Simulink^® Toolstrip, on the Simulation tab, in the Prepare gallery, select Property Inspector.

Rigid body tree — Rigid body tree model

twoJointRigidBodyTree (default) | rigidBodyTree object

Specify the rigid body tree model as a rigidBodyTree object.

Chassis pose in rigid body tree base frame — Pose of chassis frame on rigid body tree

eye(4) (default) | 4-by-4 homogeneous transformation matrix

Specify the pose of the chassis frame on the rigid body tree, with respect to the rigid body tree base as a 4-by-4 homogeneous transformation matrix.

Target frame in rigid body tree — Name of target frame in rigid body tree

base (default) | character vector | string scalar

Specify the name of the target frame in the rigid body tree.

Programmatic Use: Add Block

To add the block programmatically, use the add_block function with one of these library block paths as the source.

"offroadvehutillib/Chassis To Tree-Frame Motion"

Example: add_block("offroadvehutillib/Chassis To Tree-Frame Motion","myModel/myBlock",MakeNameUnique="on")

Version History

Introduced in R2026b