Two wheeler is one of the most popular mode of communicating in the present day transportation. Scooters occupied the most attractive position among the two wheelers in the middle class income group, for domestic use, office transportation, business and entertainment. Due to demand of fuel conservation scooter is going to gain its popularity in developing as well as developed countries.
The modern day vehicle is a complex assembly created to meet a variety of design objectives including fuel economy, handling, performance, safety, passenger comfort, drivability, and ride quality. No single vehicle can meet all of these objectives maximally. As a result, designers make compromises on some objective while giving emphasis on some other design objectives.
Suspension system of any vehicle has to meet various requirements for the proper and smooth functioning of the vehicle. Suspension is supposed to support the vehicle weight and to provide proper handling characteristics of the vehicle. Most importantly, it attempts to insulate the passenger from vibrations due to road roughness. The effect of road vibration experienced by the passenger interferes with the comfort during the ride.
In this work, the dynamic model of the scooter is achieved mathematically to simulate the problem for different cases. The objective of dynamic analysis of scooter is to calculate vertical motion of center of gravity of scooter (with rider) and it’s rotation about center of gravity in case of sudden braking, particularly over bumps and pits. After getting the vertical motion and rotation about center of gravity, the calculation of motion and rotation of any point in the scooter (e.g. pinion, rider etc.) is
very easy. The ride comfort is directly related to how center of gravity of scooter goes up and down and how it rotates.
The governing equations of the dynamic system of simplified scooter are solved by MATLAB. The name MATLAB stands for matrix laboratory. MATLAB is an interactive system whose basic data element is a matrix that does not require dimensioning. This allows to solve many numerical problems in a fraction of time as compared to writing a program in a language such as Fortran, Basic, or C. The current MATLAB programme has been written in C by Math Works. Here MATLAB function ode45 is used to solve governing equations of simplified scooter. They can solve simple differential equations or simulate complex dynamical system. Ode45 is automatic step size Runge-Kutta integration methods. Ode45 uses 4th and 5th order pair of formulae for higher accuracy to solve rapidly.
This project is mainly, dynamic comparison of LML ?NV scooter and Bajaj Classic ?SL scooter. The main emphasis is to evaluate the effect of braking and the effect of pits or bumps on the dynamics of scooter.
