Suspension Analysis: Setup Parameters
Setup → Suspension Assembly → Suspension Parameters
Calculates suspension characteristics. You must set Suspension Parameters before you can run a suspension analysis. See Running Suspension Analyses.
For the option: | Do the following: |
|---|---|
Suspension Assembly | Select the Suspension Assembly you want to analyze. The menu lists all suspension assemblies currently open in your session. |
If suspension is built with __MDI_TASA_TESTRIG (available in Adams Car Truck plugin), then Fore Axle and Aft Axle tabs will be displayed. The following options are available: | |
Fore Axle | Used to define inputs for fore axle. By default, the values provided in the fields on Fore Axle tab will be applied to the fields on Aft Axle tab. |
Aft Axle | Used to define inputs for aft axle. Fields on the Aft Axle tab are optional. If values are not provided, they will be inherited from the Fore Axle tab. |
Actuation Type | Select one of the following: ■Contact Patch ■Wheel Center |
Tire Model | Select one of the following: ■User Defined ■Property File |
If you set Tire Model to User Defined, Adams Car enables the following three options: | |
Tire Unloaded Radius | Enter a value for the unloaded radius. |
If you set Actuation Type to Wheel Center, Adams Car enables the following option: | |
Tire loaded Radius | Enter a value for the loaded radius. |
Tire Stiffness | Enter a positive number that defines the tire stiffness at the input position of the suspension assembly. In this 'User Defined' option, a negative tire normal force can occur meaning that the wheel is pulled down. |
If you set Tire Model to Property File, Adams Car enables the following option: | |
Tire Property File | Enter a tire property file. Tips on Entering File Names in Text Boxes. In this 'Tire Property File' option, no negative tire normal load will be generated. |
Wheel Mass | Enter a positive real number that defines the mass of the wheel part. |
Wheel Inertia | Enter the values that define the moments of inertia components of the wheel part. The inertia reference frame is at the center of mass (CM) location of wheel part. |
CM Offset | Optionally, enter the wheel center of mass offset. The wheel center of mass is offset by this distance along the wheel-spin (z) axis from the wheel center. |
Dual Wheels | Select one of the following: ■Active - to activate dual wheels ■Inactive - to deactivate dual wheels |
Dual Wheel Offset | Enter a real value which represents lateral offset for the placement of the outside wheel from inside wheel center. |
Dual CM Offset | Optionally, enter the outside wheel center of mass offset. The outside wheel center of mass is offset by this distance along the wheel-spin (z) axis from the outside wheel center. |
Vehicle Parameters | |
Sprung Mass | Enter the mass of the vehicle supported by the suspensions. For most vehicles, the sprung mass is about 90% of the total unloaded vehicle mass. |
CG Height | Enter a positive number for the vertical distance from the contact patch to the center of gravity (center of mass) of the sprung mass. |
Wheelbase | Enter a positive number that describes the longitudinal distance between the front and rear wheel centers. |
Drive Ratio | Select a number that defines the percentage of the total driving force applied to the wheels: ■For a front suspension, use a setting of 100 to define a pure front-wheel-drive setup and a setting of 0 to define a pure rear-wheel-drive setup. ■For a rear suspension, use a setting of 0 to define a pure front-wheel-drive setup and a value of 100 to define a pure rear-wheel-drive setup. ■For an all-wheel-drive vehicle, the drive ratio might be, for example, 60. ■For a rear suspensions using TASA testrig to define a pure rear wheel drive, use a setting of 100 for fore axle and 100 for aft axle. |
Brake Ratio | Select the percentage of the total braking force applied to the wheels. The brake ratio is often called brake bias and is constant. The value defines the proportion of braking force between front and rear axles. For a rear suspension with a constant front/rear proportion of 60/40, this value will be set to 40. For a suspension using TASA testrig with a constant front/rear proportion of 60/40, this value will be set to 40 for fore axle and 40 for aft axle. |
If you set Tire Model to Property File, Adams Car enables the following option: | |
 | Select to view property file information. By default, your template-based product displays this information in the Information window, but you can choose to display the information in a text editor. Learn about: |
Notes: | ■Adams Car uses the parameters cg_height, wheelbase, sprung_mass, and tire stiffness when calculating: ■Percent anti-dive ■ Dive ■ Percent anti-lift ■ Lift ■ Percent anti-squat ■ Roll center height ■Adams Car uses the tire stiffness when calculating: ■Suspension rates ■ Total roll rate |