Simulink- Bus Suspension

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Assignment 5: Bus Damper Bruno Felix dos Santos Coelho Assignment: This Assignment consist of a model of a bus suspension system, in order to simulate this we use two spring damper systems; one simulates the bus dumper itself and the order the bus tires. In order to simplify the model only one tire is used, thus assuming that every constant is divided by the number of tires. Equations and Values: According to the Model three forces act on the first mass: the input force, the first damper force and the first spring force, on the second mass, which represents the tires, there are 5 forces acting; the external input, two spring forces and to dumper forces. The spring damper system is based on the following differential equation: This equation comes from newton law, Hooke's law and Kinetic Friction The constant values used were: Bus mass 3000 kg Suspension mass 300 kg Spring constant of suspension system 80000 N/m Spring constant of wheel and tire 500000 N/m Damping constant of suspension system 350 N.s/m When the vehicle is experiencing any road disturbance (i.e. pot holes, cracks,and uneven pavement) or a force, the vehicle body should not have large oscillations, and the oscillations should dissipate quickly. Since the distance X1­floor is very difficult to measure, and the deformation of the tire (X2­W) is negligible, we will used the distance X1­X2 instead of X1­W as the output in our problem. Simulink Model: For this example a force of 10 newton and a disturbance of 0 m were used, assuming a flat road. Conclusion The Model behaves as expected, for a 10 newton force it oscillates less than a centimeter and this oscillations quickly becomes even more irrelevant. Greater forces produces greater oscillations but those necessary to

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