This paper presents an optimal design of primary stiffness of a conventional truck. The aim of this study is to derive an analytical equation which represents optimal stiffness for hunting stability and curving performance. Using a simple 4-degrees-of-freedom dynamic model of truck, optimal primary yaw and lateral stiffnesses are calculated for critical speed of wheelset and truck hunting as functions of various wheelset parameters and creep coefficients. The analytical method of curving performance is proposed considering the track conditions described by curve radius, flangeway clearance and cant deficiency. Introducing non-dimensional flangeway clearance, normalized unbalanced centrifugal force, bending and shearing stiffnesses, four equations are obtained. If these equations are satisfied, good curving performance can be expected. Using the results, the optimal design of conventional passenger truck for high speed operation has been discussed.
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SUDA et al. (1986) studied this question.