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Active Suspention Sistem. Essay

3545 words - 14 pages

ACTIVE SUSPENSION SYSTEM FOR A MOTOR CARIntroductionA vehicle exists to carry someone or something from one place to another. In doing that there should be as little disturbance as possible of what is being carried. If the load is inanimate, the less the disturbance the less in the way of special packing will be necessary. If animate, then the better the condition after the journey, the longer the journey can be without fatigue. When the driver has less fatigue then he can maintain a better concentration on driving the vehicle.The basic need for a suspension system in a vehicle is not entirely caused by human susceptibility to the discomforts of vibration, although isolation from the road-induced disturbances is a highly desirable design aim. Maintaining contact between the wheels and the road surface is far more fundamental, as the control and stability of the vehicle relies upon it totally.It is essential for a car suspension system to fulfill some basic requirements. The most important of them are listed below.Ride comfortThe ride comfort is determined by the acceleration of the body. The acceleration forces are experienced by the passengers as a disturbance, and set demands on the load and the vehicle. The suspension system has the task to isolate these disturbances, resulting from the uneven road conditions, from the body. The lower the acceleration, the better the ride comfort.SafetySafety is dependent on the ability of the wheels to transfer the longitudinal and lateral forces onto the road. The vehicle suspension has the task of keeping the wheels as close to the road surface as possible. Wheel vibrations must be dampened and the dangerous lifting of the wheels must be avoided. For complex active suspension systems, additional emphasis should be given on the Failure Mode and Effects Analysis (FMEA).HandlingHandling depends on the tyre lateral load changes and the tyre lateral load transfer distribution, which results from the dynamic body movements. The handling is improved, when the vehicle suspension system ensures these parameters keep a minimum value.Body LevelingWhen loading changes occur, it is the task of the suspension system to keep the vehicle level constant as possible, so that the complete suspension travel is available for the wheel movements. On the other hand, it could be sensible for aerodynamic reasons, to vary the stationary body positions by means of the automatic body leveling system, depending on, for example, the vehicle speed.Noise ComfortAnother task of suspension system is the isolation of the body from high frequency road disturbances. The passengers in the car note these disturbances acoustically and consequently the noise comfort reduced.Active suspension systemsTraditionally automotive suspension designs have been a compromise between the three conflicting criteria of road holding, load carrying and passenger comfort. The suspension system must support the vehicle, provide directional control during handling...

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