Objective: Students shall be able to develop and analyse mathematical models of multiple degree of freedom system by considering constrains and...

Modify a wheelchair into 2 DoF system to enable patient feels less shaking (vibration impact) when moving over a playground rough surface.

Steps:

 Modify the structure into a 2D spring and mass vibration model.

 Search from the product catalogues to get actual values of elastic stiffness for the wheels or spring stiffness in you 2 DoF model.

 Illustrate the modal forms of vibration.

 If to install a vibration absorber, determine the optimal operating frequency when the wheelchair is used to carry 160 kgf weight of patient.

 The operating frequency has to be >20% between the 2 natural frequencies.

 Justify your design to convince the hospital on how the wheelchair is comfortable when carrying a patient.