STFT BASED SHOCK ABSORBER QUALITY CONTROLLER Project
STFT BASED SHOCK ABSORBER QUALITY CONTROLLER Project report
Abstract— Shock absorber is very important term in automobile industries. They are used for the driving comfort and driving safety. This paper presents performance characteristics of the shock absorbers under real conditions. Here We are using Auto Rickshaw Tyre 4.00-8 RAHI. The road disturbance is generated in the model by giving speed brakes fixed on drum which is rotated by using motor, Input Load depends on Motor capacity. The aim of the project is to study and analyze shock absorber using MATLAB STFT/DWT Algorithm. The short-time Fourier transform (STFT), is a Fourier-related transform used to determine the sinusoidal frequency and phase content of local sections of a signal as it changes over time. The Shock absorber is a Suspension system which designed mechanically to control shock impulse and dissipate kinetic energy. It reduces the amplitude of disturbances leading to increase in comfort and improved ride quality. Shock absorber minimizes the effect of traveling on a rough ground. Now-a-days Modern vehicles come along with strong shock absorbers to tolerate any type of bouncy conditions. If supposedly shock absorber is not used then to control excessive suspension movement, stiffer springs will be used. The suspension system of an automobile is one which separates the wheel assembly from the body. The primary function of the suspension system is to isolate the vehicle structure from shocks and vibration due to irregularities of the road surface. The Suspension system is used to support weight, absorb and dampen road shock, and help maintain tire contact as well as proper wheel to chassis relationship . A vehicle in motion is more than wheels turning. As the wheel revolves, the suspension system turns in dynamic state of balance, continuously compensating and adjusting for changing driving conditions according to road profile. Suspension of vehicle need to analyze before the manufacturing. This is because to make sure components in shock absorber system remain in good conditions.From this Suspension testing setup we can test multiple numbers of suspensions at different loads and different speeds. Also we can use suspensions of different height. By changing different suspensions and oils we can find out optimum motion transmissibility. With ultimate objective of studying and plotting dynamic characteristics for Hero Splendor suspension and Honda Shine suspension using single wheel model of suspension analysis to produced large number of results. However it concludes the project work with following points: 1. The suspension system gives best performance when designed to be slightly under-damped. 2. From experimental results and graphs we can conclude that for good ride, transmissibility should be as low as possible and this can be attained by using low damping constant and high spring stiffness and Honda Shine suspension gives the better results as compared to Splendor suspension.Suspension is the term given to the system of springs, shock absorbers and linkages that connects a vehicle to its wheels. Shock absorber with its whole assembly is an important part of automotive suspension system which has an effect on ride characteristics. Shock absorbers are also critical for tire to road contact which to reduce the tendency of a tire to lift off the road. This affects on braking, steering, cornering and overall stability of the vehicle. The removal of the shock absorber from suspension can cause the vehicle bounce up and down. It is possible for the vehicle to be driven, but if the suspension drops from the driving over a severe bump, the rear spring can fall out. Basically, the shock absorbers must be replaced after driving exceeds certain distance. But this actually not should have been followed if there are no defective.