- Add an Event
Add a ride event to a previously built model.
- Run an Event
Run an event that has been added to a model.
- Braking In a Turn
A Braking in a Turn event simulates a vehicle decelerating in a circular path. The purpose of this event is to measure the stability of a vehicle while braking and turning. The vehicle is driven straight for the entry length and then turns onto the circular path. At the time to apply brakes, the brake torque is ramped on using the brake step duration time so the vehicle slows at the desired deceleration rate. The event ends at the end of simulation time.
- Constant Radius
The Constant Radius event simulates a vehicle driving in a circular path. The Constant Radius event maintains a constant turn radius and varies the vehicle velocity to produce increasing amounts of lateral acceleration. Steering and torque controllers maintain the path and the speed of the vehicle through the event. A plot template is available to plot the results. The Constant Radius event is used to characterize the roll and understeer characteristics of a vehicle.
- Double Lane Change
A Double Lane Change event drives the vehicle through a lane change and a return to lane maneuver, attempting to follow the centerline of the defined lane. You can define the speed of the lane change, along with the lane dimensions. A steer controller is used to follow the path and a drive torque controller is used to maintain speed throughout the event. The event supports right and left lane changes. A plot template is available to plot the results.
- J-turn
A J-turn event simulates a vehicle response to a large steer in one direction, a dwell time to allow the vehicle to react, and a large steer in the opposite direction, with an additional reaction time. The event is used to characterize the stability of vehicles. Both steer directions can be run by reversing the sign of the steering inputs. A drive torque controller is used to maintain a constant speed and standard outputs for the vehicle and tires are included in the tire system and the output requests system. A plot template is available to plot the results.
- Kinematics and Compliance
The Kinematics and Compliance (K&C) test is performed by applying a range of forces at the two contact patches of a half-vehicle model to determine the suspension’s characteristics. The motion of the wheel caused by the force application is measured and recorded during this event. This in turn helps to determine suspension hard point locations, spring rates, bushing rates, arm lengths, and so on.
- Power-off in a Straight Line
A Power-off in a Straight Line event simulates the dynamics of a vehicle due to a sudden removal of drive torque. A steer controller drives the vehicle on a straight line and the drive torque controller maintains speed until the throttle is removed. Engine motoring torque is not applied after the throttle torque is removed. A plot template is available to plot the results.
- Pulse Steer
A Pulse steer event simulates a vehicle response to a sudden pulse input to the steering wheel while driving in a straight line at a constant speed. The input to the event can be a steering wheel torque or angle, and you can set the pulse magnitude and width. The pulse can be input as a sine, step, or ramp function and you control the width. A drive torque controller is used to maintain a constant speed, and standard outputs for the vehicle and tires are included in the tire System and the output requests system. A plot template is available to plot the results.
- Single Lane Change
The Single Lane Change event drives the vehicle through a single lane change, attempting to follow the centerline of the defined lane. You can define the speed of the lane change, along with the lane dimensions. A steering controller is used to follow the path and a torque controller is used to maintain speed through the event. The event supports right and left lane changes. A plot template is available to plot the results.
- Sinusoidal Steering
A Sinusoidal steering event simulates a vehicle driving at a constant speed while a sin wave input is applied to the steering wheel. The event is used to simulate the On-center steering test described in SAE paper 840069. Standard vehicle outputs are included in the event. Body state variable output requests (displacement, velocity, acceleration) are included in the body system and tire output is included in the tire system. A plot template is available to plot the results.
- Static Ride Analysis
The Static Ride analysis is a simulation of both wheels moving up and down, in phase, with the steering wheel held fixed. The chassis is fixed-to-ground. The displacement of the wheel center is prescribed by the user. The suspension moves via a simple control system and a “suspension test rig”. The wheel is constrained at the tire patch location to the suspension test rig using an in-plane joint. Standard suspension requests (caster, camber, toe, etc.) are included as part of the ride analysis and are described here. The front and rear suspension ride analyses are similar.
- Steer Release in a Turn
A Sinusoidal steering event simulates a vehicle driving at a constant speed while a sin wave input is applied to the steering wheel. The event is used to simulate the On-center steering test described in SAE paper 840069. Standard vehicle outputs are included in the event. Body state variable output requests (displacement, velocity, acceleration) are included in the body system and tire output is included in the tire system. A plot template is available to plot the results.
- Step Steer
A Step Steer event simulates vehicle response to a sudden step input to the steering wheel. The steering input is a rotational motion or torque at the steering wheel or the input shaft to the steering gear. The standard output requests are included to measure vehicle response. Tire requests are included to understand tire forces during the event. A drive torque controller is added to maintain constant speed during the event to drive the vehicle forward. A plot template is available to plot the results.
- Straight Line Acceleration
A Straight Line Acceleration event simulates a vehicle accelerating at a constant rate in a straight line. The event is designed to characterize the chassis behavior during acceleration. A drive torque controller applies a controlled torque to the vehicle drivetrain to maintain the requested acceleration. Output requests are included to measure the vehicle behavior, tire response and other common vehicle system metrics. A plot template is available to plot the results.
- Straight Line Braking
A Straight Line Braking event simulates a vehicle slowing in a straight line. The steering wheel is normally held fixed but can be released. A braking torque controller applies torque at the wheels to slow the vehicle and appropriate output requests are included. A plot template is available to the plot the results.
- Swept Sine
A Swept Sine event simulates a vehicle driving at a constant speed with a sinusoidal steering input of constant magnitude but increasing frequency applied. Output Requests are included to measure the vehicle state variables, tire forces, and tire state variables. A Drive torque controller is used maintain the constant velocity of the vehicle. A plot template is available to plot the results.
- Swept Steer
A Swept Steer event simulates a ramped steer input into a vehicle driving at a steady speed. The event is typically used to predict the steady state dynamic response of the vehicle. Input can be steering wheel angle or torque. Standard vehicle output requests are included in the event. A drive torque controller is included to maintain constant speed. A plot template is available to plot the results.
- Throttle-off Cornering
A Throttle-off Cornering event simulates the dynamics of a vehicle driving a constant radius turn at steady state and the reaction of the vehicle due to a sudden removal of the drive torque while cornering. The event includes a short straight section to allow the vehicle to come to steady state, the constant radius circle, throttle removal, and the subsequent vehicle reaction. A left or right turn can be simulated. The appropriate vehicle and tire output requests are included. A plot template is available to plot the results.
- Throttle-off Turn-in
A Throttle-off Turn-in event simulates the dynamics of a vehicle driving a constant radius turn at steady state, the reaction of the vehicle due to a sudden removal of drive torque during the cornering event, and the reaction of the vehicle to a slowly applied ramp steer. The event includes a short straight section to allow the vehicle to come to steady state, the constant radius circle, throttle removal, and the increasing ramp steer. The event is designed to simulate a highway exit ramp maneuver with a decreasing radius turn on the exit ramp. Appropriate vehicle and tire output requests are included. A plot template is available to plot the results.
- Event Specific Reports
Various plots are reported in different vehicle events. The plots are selected based on metrics that are important for a given event.
- Jupyter Reports for Full Vehicles and Suspension Analyses
