현가장치의 조향축 계산을 위한 일반적 해석방법

A new method that can accurately calculate kingpin axes of all suspension types is proposed. Methods using instant axis theory are widely used to determine the kingpin axis of a suspension system. In these methods, since a suspension system has two degrees of freedom, it is commonly used to find a kingpin axis during steer motion by constraining other motion such as bump-rebound motion. Constraining the motion, however, deteriorates the accuracy of the results. In this study, four constraint wrenches that come from suspension links and the definition of a kingpin axis are used to extract the position of the kingpin axis without any extra assumption. To solve four linear equations from wrench axes and one quadratic equation from kingpin axis definition, singular value decomposition method is used. Using numerical examples that consist of McPherson strut, double wishbone, and multi-link suspension systems, accuracy and versatility of the proposed method is shown.