Design and analysis of helical coil spring forms for independent suspensions of automobiles

Thesis Type: Postgraduate

Institution Of The Thesis: Orta Doğu Teknik Üniversitesi, Graduate School of Natural and Applied Sciences, Graduate School of Natural and Applied Sciences, Turkey

Approval Date: 2015




Suspension system is one of the major and indispensable subsystems for land vehicles and has functions of providing better road holding, handling, and ride comfort. There are many suspension system types used for automobiles, and MacPherson strut suspension is one of the most widely used suspension system type due to its favorable features like simplicity, low cost, and high performance. However, there exists a drawback of this suspension type; since the coil springs have no ability to absorb lateral forces, undesired dry friction effects on the damper may degrade the ride comfort. As remedy to this drawback, the most popular and contemporary application is the use of coil spring forms which are called side load springs. In this study, a procedure for the design of a class of side load springs to be used in MacPherson strut type suspension to reduce the side loads on the damper is developed. The procedure starts with the analysis of the suspension system to estimate the side force required. The next step is the determination of the side load spring form to provide the required side force. Then a finite element model of the spring is prepared and the side force provided by the designed spring is obtained. A graphical user interface is developed to consider various design alternatives by varying design parameters.