WISHBONE ARMS :
Design for optimal geometry of the control arms is done to both support the race-weight of the vehicle as well as to provide optimal performance. Design of the control arms also includes maximum adjustability in order to tune the suspension for a given task at hand. The front A-arms are constructed of 3mm wall thickness, 1 inch diameter 4130 round Chrome moly tube. FEA was also performed on the front arms, and proved them to be capable of handling the stresses exerted on them in extreme situations. Also kinematic analysis on the control arms was done as shown in the figure below to determine the dimensions of cross-section of control arms.
FEM OF WISHBONE ARM (A-ARM ) :
Finite element analysis has also been conducted on the front arms. The stresses created in the part can be seen in Figure. The biggest reason for choosing this design is that it only requires one piece, using a simple jig, to be fabricated. It has been determined that the tubing used for the suspension arms will be ASTM 106a steel. It will be 1” diameter with 3” wall thickness. This was determined after comparing the weight and material properties for several sizes of tubings.
Determination of length of wishbone arms:-
The length of the wishbone is found virtually in CATIA V5R20. As we know the pivot points of wishbones as well as the ball joint points on the knuckle.
Roll Centre Height:-
The roll centre height was found in CATIA V5R20 by extending the wishbone arm axis to its instantaneous centre and then from the instantaneous centre a line is drawn through the tire centre on the ground which intersect the vehicle centre line, this point is called roll centre and distance of this point from the C.G is the roll centre height.
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