Motorbike rear suspension:
This is an individual assignment which comprises of four sections:
1) Conduct research into the geometry of a typical motorcycle suspension and specify a typical wheel diameter and sprung mass. These parameters will be used for your following tasks.
2) Design a rising rate linkage mechanism that will permit at least 120 mm of rear wheel travel. The above figure can be used as a basis for your design. Your design should clearly show the joints you have chosen, and you should justify your choices. The linkage should be demonstrated in ADAMS model with wheel travel and raising spring rate. It is suggested that you investigate current motorcycle suspension linkages.
3) Specify the springs and dampers. Your rates should be chosen to provide appropriate ride behaviour under an absolute bump limit (a vertical load equivalent to 3 m/s2). You may analyse it by varying your specified values. You may optimise your design to ensure that the suspension does not reach the end of its travel when it passes the “absolute bump limit”.
4) Analyse the behaviour of the motorcycle under motorway conditions with a road profile of a +/- 3 mm input at a wavelength of 30 m. The frequency of the road profile depends on the vehicle speed. You may vary the driving speed and compare your result with the theory you’ve learned. You should try to ensure that the rear suspension you have designed will provide the maximum comfort for the rider (the student will need to define this criteria), and the minimum force transmissibility on the motorcycle.