LMS Virtual Motin车辆平顺性和操纵稳定性培训 讲义 第2天

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Vehicle Dynamics:

Vehicle Analysis Interface

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Vehicle Assembly: Vehicle Analysis

Vehicle Analysis Interface assists the User with

creation of driving dynamic events

The Analysis portion will set up a standard list of maneuvers

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Vehicle Analysis: Standard Events

ISO and Steady State

Circular (static) have event dialogs that are dedicated only to that scenario.ISO standards define all the possible step steer options

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Vehicle Analysis: Initial Conditions and Road Tabs

Initial Conditions are automatically

applied to all bodies listed in the Parts tab of all referenced subsystems (suspensions, steering etc.)

A Road element can be specified from

Road tab, either General or Left/Right type (different road profiles for left and right side)

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Vehicle Analysis: Steering Tab

In the Steering tab it is

possible to define a steering input to the vehicle, to either steering wheel or rack. Two driver types are available:

Kinematic Steering (J-turn, Impulse, Straight-Line driving, User-defined

angle/disp, User-defined torque/force) Path Following

Driver for closed loop events

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Vehicle Analysis: Throttle Tab

The Throttle tab describes the method

chosen to drive the wheels of the vehicle: Selecting Controls allows the user to specify a Desired Vehicle Speed using a linear velocity-time function. Cruise Control will keep the wheels on the vehicle at the speed specified in the Initial Conditions tab.

If Driver is selected, then there is an option of specifying None, Drive or

Torque separately on the front and rear wheels.

•None : no driver or force will be created.

•Drive : relative angle drivers will be created on the corresponding

revolute joints.

•Torque : three point forces will be created on the corresponding tire bodies.

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Vehicle Analysis: Braking

The

Braking Tab defines the

desired action of the brake system

The brake contribution to the event is setup by Braking Type .

Desired Speed and Deceleration Rate

create control system to achieve user defined targets.

Max Brake Force is an open loop event that applies a torque to the wheels.