Simulation of Motor Bike Suspension System ME 270 Advanced Computer Aided Design of Dynamic System Guided By: Professor Jose J. Granda Department Of Mechanical Engineering California State University, Sacramento Prepared By: NISHITH SHAH VAMSHI KRISHNA REDDY CHADA

Objectives  The displacement of human body, front and rear shock absorbers, force acting on the human body and velocity of the human body when he rides the motor bike at a speed of 50 m/sec on a plain road.  The displacement of human body, front and rear shock absorbers, force acting on the human body and velocity of the human body when he rides the motor bike at a speed of 50 m/sec and the front wheel is on the bump and rear wheel on the plain road.  The displacement of human body, front and rear shock absorbers and force acting on the human body and velocity of the human body when he rides the motor bike at a speed of 50 m/sec and the rear wheel on the bump and front wheel on the plain road.

INITIAL CONDITIONS In order to find out our objectives we consider initial design conditions of motor bike suspension system. Those are as fallows. In order to find out our objectives we consider initial design conditions of motor bike suspension system. Those are as fallows. Mass of the motorbike = 100kgs Mass of the motorbike = 100kgs Mass of the rider = 80kgs Mass of the rider = 80kgs Mass of the wheels (front & rear) = 20kgs Mass of the wheels (front & rear) = 20kgs Spring constant of strut (front & rear) = k = 1 x 104 N/m Spring constant of strut (front & rear) = k = 1 x 104 N/m Damping resistance of the shock absorber (front & rear) Damping resistance of the shock absorber (front & rear) =500 N-s/m =500 N-s/m The shock absorbing capacity of the tire = 2 N/m The shock absorbing capacity of the tire = 2 N/m

Procedure The initial step is to draw the bond graph of the motor bike suspension system in the CAMP-G software. The initial step is to draw the bond graph of the motor bike suspension system in the CAMP-G software. Then the bond graph drawn should be interfaced with the MATLAB. Then the bond graph drawn should be interfaced with the MATLAB. The values of initial design conditions of the motor bike suspension system are to be placed in the campg.mod file. The values of initial design conditions of the motor bike suspension system are to be placed in the campg.mod file. Then different conditions has to given in the campg.mod file to get our project objectives as follows. Then different conditions has to given in the campg.mod file to get our project objectives as follows. Then we have to run the MATLAB file and we get the different simulations for different conditions. Then we have to run the MATLAB file and we get the different simulations for different conditions.

When we run the MATLAB file we get three graphs for each problem which can be seen in another file which we are submitting. When we run the MATLAB file we get three graphs for each problem which can be seen in another file which we are submitting. From these graphs we can know the displacement,force and velocity acting upon the human body and displacement of the shock absorbers both front and rear. From these graphs we can know the displacement,force and velocity acting upon the human body and displacement of the shock absorbers both front and rear. The graphs are as fallows The graphs are as fallows

GRAPH 1

GRAPH 2

GRAPH 3

GRAPH 4

GRAPH 5

CONCLUSION The maximum displacement of human body, front absorber and rear absorber when motorbike running with 50m/sec is 0.5meters, 5 meters and 5 meters respectively and force acting on the human body is 5 N and velocity is 0.8 m/sec. But when the front wheel is on the dump then the maximum displacement of human body, front and rear absorber at same speed are 0.25m, 0.019m and The maximum displacement of human body, front absorber and rear absorber when motorbike running with 50m/sec is 0.5meters, 5 meters and 5 meters respectively and force acting on the human body is 5 N and velocity is 0.8 m/sec. But when the front wheel is on the dump then the maximum displacement of human body, front and rear absorber at same speed are 0.25m, 0.019m and m and force acting on the human body is 2.5 N and velocity of the human body is 0.4m/sec.And when the back wheel is on the dump then the maximum displacement of human body, front and rear absorber at same speed are 0.2m,-0.012m and 0.012m and force acting on the human body is 2.2 N and velocity is 0.4m/sec.Thus we conclude our project report that at different speed and different road conditions the displacement of human body, shock absorbers, force acting on the human body and velocity of the human body varies which should be within the design standards m and force acting on the human body is 2.5 N and velocity of the human body is 0.4m/sec.And when the back wheel is on the dump then the maximum displacement of human body, front and rear absorber at same speed are 0.2m,-0.012m and 0.012m and force acting on the human body is 2.2 N and velocity is 0.4m/sec.Thus we conclude our project report that at different speed and different road conditions the displacement of human body, shock absorbers, force acting on the human body and velocity of the human body varies which should be within the design standards.