Mechanical Engineering

If i am correct, the fixed support should be given at the Bushings and the ball joint is given a vibrating motion.

It is a part with two conditions for the connection with the chassis, usually a pivot with a silent block and a ball joint, but it can be two pivots too, and an other condition which is usually a ball joint or a pivot for the connection to the hub, or for a bit of cars, just a pivot. The geometry of the attatches of the chassis could be considered as static, and the hub could be considered as the moving part, so you apply your forces on the ball joint of the hub. I don't know if it is really your question, because I didn't understand everything you wanted to say, so tell me if you want more explainations and if you want to see how it looks like in SW, tell me !

Can you share an image of it so that we I can take a look. Then it would be easier to tell where to six and apply load

If you just want to study how it deforms itself, just forget the silentblocks whith the pivots or ball joints (this one is from a 206 but the conception can differ from a car to an other) and just put a static geometry at the silentblocks holes connected to the chassis and put your force on the ball joint of the wheel hub.

this shape is okay. The question is if i analyze this model in some FEA tool then which boundary conditions need to apply. i means which ends need to fix and where to apply the load.

In blue, you fix it (boundary conditions) and in red you apply your load

thanks so much