Adjusting_Hard_Points_Tutorial

Adjusting_Hard_Points_Tutorial - Version 1.0 6/18/2008 1...

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Unformatted text preview: Version 1.0 6/18/2008 1 Adams/Car Tutorial Modifying Suspension Hardpoints Overview In ADAMS/Car hardpoints are the building blocks for larger components. The hardpoints are essentially the joint locations for the parts of the vehicle. In ADAMS/Car you will move suspension hardpoints to change suspension kinematics, steering hardpoints to change steering characteristics, etc. For example, you can move the outer steering tierod connection to the upright to adjust Ackermann steering. When you move a hardpoint, ADAMS/Car moves the joint location to the position you specify. The actual connections at the hardpoints are modeled as ideal joints with specified degrees of freedom or bushings with 6 degrees of freedom and joint stiffnesses. The FSAE and Mini-Baja frames have no role in defining hardpoint locations. Hardpoints mounted to the frame are all connected to a rigid chassis. The image of the frame has no structural role in ADAMS/Car. Common abbreviations found while modifying the suspension are found below. hp[lr] hardpoint left or right arb anti roll bar lca lower control arm prod push rod uca upper control arm Control Arm Hardpoints The suspension control arm geometry defines suspension properties such as roll center, motion ratio and camber profile. With ADAMS/Car you can adjust the control arm geometry by adjusting hardpoints and then simulate wheel travel to determine the kinematics for the new geometry. The FSAE model has independent suspensions front and rear. The Mini-Baja model has independent front suspension and an independent or rear swing arm suspension. To modify the control arm of an open suspension subsystem click Adjust>Hardpoint>Table and the Hardpoint Modification Table will appear. Warning: Remember to change your working directory before you begin this lesson. If you do not, Adams may not work correctly. Also remember to move everything you wish to keep from the working directory before you log off. See the Opening Files tutorial for more information. Version 1.0 6/18/2008 2 Below are the hardpoint tables for the FSAE and Mini-Baja front suspensions with the upper and lower control arm hardpoints highlighted. Version 1.0 6/18/2008 3 Mini-Baja Swing Arm The swing arm found on the Mini-Baja can not be simulated by its self. A full vehicle assembly must be opened to simulate swing arm motion. Pushrod, Bellcrank & Shock Hardpoints (FSAE) When modifying the bell crank placement on the FSAE model you must enter the position of the joint connection to the chassis ( hpl_bellcrank_pivot ) and a point to define the rotation axis ( hpl_bellcrank_pivot_orient ). The other points defining the bell crank are the pushrod, anti-roll bar and shock connections (...
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Adjusting_Hard_Points_Tutorial - Version 1.0 6/18/2008 1...

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