User Name Remember Me? Page 1 of 2 1 2 Last Jump to page: Results 1 to 10 of Hello forum. I'm fairly new to FSAE and suspension design. One of the overwhelming problems that I'm having is figure out the step by step process in designing the suspension system.
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The topic of this project is the kinematic analysis of an independent suspension, taking into consideration the suspension system of the Formula SAE electric car of the University of Padua RaceUP Team. First of all I developed the model in Adams View, then I checked if the output results were correct. To verify that, I compered my results with the results obtained using Lotus Suspension Analysis Software.
Since the results were the same and my model was correct, I decided to use this model. Initially the model had 2 actuators that raised and lowered the wheels with a static frame. This configuration was correct for bump and rebound, but not when I simulated rolling. So I modified the model by importing the frame, moving it while the wheels were on the ground. Then I used this model for the optimization of the kinematics points.
Using DOE in Adams with many parameters and level of measures is very difficult too many eperiments required , so I dealt with the problem by looking for the main parameter and optimizing this one. Then I checked that the others parameters were correct. The elements were imported in. Values such as roll center height, mechanical trail and radius scrub must remain constant, being very important for vehicle stability.
As mentioned above, I focused on optimizing toe, trying to minimize its variation as much as possible. First of all I decided the parameters that could be changed, trying first try not to change the kinematic points to the frame they would involve the remaking of new parts.
As we can see from the results above, after the optimization , the variation of the toe has decreased from 0. We can achive these results because kingpin angle and caster angle have changed, in fact they have increased their values. This cause the improvement of the toe, but change also other two main parameters in the vehicle dynamics: mechamical trail and scrub radius. Search for:. Skip to content. I created a Design Variable for each coordinate of the points mentioned above, parameterizing the model:.
Second Step:. Web design by paomedia.
FSAE rear suspension
FSAE front suspension
In particular it is a double wishbone pull rod system with an anti roll bar: the wheel is connected by two bearings to the upright. The last one is linked to the frame by an upper and a lower wishbone. A rod connects the upper wishbone to a rocker, to wich the spring and the damper are linked. Also the anti roll bar is linked to the rocker thanks to a tie beam. Finally, another rod connects the upright to the frame to control the toe angle. The rules of the competition prescribes at least a wheel travel of 25 mm both in bump and in rebound, while there are no other significant restrictions on the kinematics of the system.