SIMVehiclesSubmodules

Body submodule

Use body parameters to define sprung mass, inertia, wheelbase, and ground clearance contact points for a vehicle setup.

Body defines the vehicle sprung mass model, dimensions, inertia, and ground-clearance contact points. Use it as the baseline physical body for a vehicle assembly.

When to use it

Use body when you need a reusable setup building block that can be selected in a vehicle assembly. Create and maintain it from Design > Bodies, then select it in the vehicle slot Body.

How it fits vehicle setup

  1. Create or duplicate the submodule from the Design section.
  2. Open the submodule row to review and edit parameter values.
  3. Save changes with Update Data.
  4. Open Vehicles and select the submodule in Vehicle Assembly.
  5. Use the vehicle detail tabs to inspect the selected submodule inside the vehicle context.

You need module create permission to create a new submodule and module update permission to edit values.

Parameter reference

Units, defaults, and ranges show n/a when no stable user-facing value was verified in the source used for this page. Method rows control which constant, lookup table, or polynomial rows are active in the product table.

General

ParameterDescriptionUnitsDefaultValidation / Range
WheelbaseDistance between center of front axle to center of rear axle.mmn/an/a
Sprung MassThe weight of the sprung mass. Normally this is the car body and everything that is attached to it plus half of the weight of the suspension link arms and drive shafts.kgn/an/a
Sprung Mass CoGThe coordinates of the sprung mass center of gravity referring to the vehicle coordinate system.mmn/an/a
IxxThe diagonal term of the inertia tensor of the sprung mass denoting the inertia around the x axis (roll).kgm²n/an/a
IyyThe diagonal term of the inertia tensor of the sprung mass denoting the inertia around the y axis (pitch).kgm²n/an/a
IzzThe diagonal term of the inertia tensor of the sprung mass denoting the inertia around the z axis (yaw).kgm²n/an/a
IxyThe off-diagonal term of the inertia tensor of the sprung mass denoting the inertia around the y-axis when the body is rotated around the x-axiskgm²n/an/a
IyzThe off-diagonal term of the inertia tensor of the sprung mass denoting the inertia around the z-axis when the body is rotated around the y-axiskgm²n/an/a
IxyThe off-diagonal term of the inertia tensor of the sprung mass denoting the inertia around the z-axis when the body is rotated around the x-axiskgm²n/an/a

Ground clearance

ParameterDescriptionUnitsDefaultValidation / Range
Point 1The coordinates of a chosen ground clearance point (#1) referring to the vehicle coordinate system. The defined coordinate will exist symmetrical left/right on the car during the simulations.mmn/an/a
Point 2The coordinates of a chosen ground clearance point (#2) referring to the vehicle coordinate system. The defined coordinate will exist symmetrical left/right on the car during the simulations.mmn/an/a
Point 3The coordinates of a chosen ground clearance point (#3) referring to the vehicle coordinate system. The defined coordinate will exist symmetrical left/right on the car during the simulations.mmn/an/a
Point 4The coordinates of a chosen ground clearance point (#4) referring to the vehicle coordinate system. The defined coordinate will exist symmetrical left/right on the car during the simulations.mmn/an/a
Point 5The coordinates of a chosen ground clearance point (#5) referring to the vehicle coordinate system. The defined coordinate will exist symmetrical left/right on the car during the simulations.mmn/an/a
Point 1The body to ground contact average friction coefficient of a chosen ground clearance point (#1).n/an/an/a
Point 2The body to ground contact average friction coefficient of a chosen ground clearance point (#2).n/an/an/a
Point 3The body to ground contact average friction coefficient of a chosen ground clearance point (#3).n/an/an/a
Point 4The body to ground contact average friction coefficient of a chosen ground clearance point (#4).n/an/an/a
Point 5The body to ground contact average friction coefficient of a chosen ground clearance point (#5).n/an/an/a
Point 1The body to ground contact vertical stiffness of a chosen ground clearance point (#1).N/mn/an/a
Point 2The body to ground contact vertical stiffness of a chosen ground clearance point (#2).N/mn/an/a
Point 3The body to ground contact vertical stiffness of a chosen ground clearance point (#3).N/mn/an/a
Point 4The body to ground contact vertical stiffness of a chosen ground clearance point (#4).N/mn/an/a
Point 5The body to ground contact vertical stiffness of a chosen ground clearance point (#5).N/mn/an/a

Aerodynamics submodule

Use aerodynamic parameters to model drag, lift, ride-height dependency, speed dependency, and yaw dependency for a vehicle setup.

Brakes submodule

Use brake parameters to define hydraulic distribution, master cylinder areas, caliper area, effective radius, and pad friction.

On this page

When to use itHow it fits vehicle setupParameter referenceGeneralGround clearanceRelated pages