The paper describes a mathematical model for wheeled vehicle with automatic transmission of «torque converter - coupling - gearbox» type. In order to compare this type of transmission and mechanical one with same number of gears and ratios, optimal characteristics of torque converter for considered vehicle are selected. The paper presents the results of simulation of wheeled vehicle moving for both variants of gearbox in conditions involving variable resistance and moving velocity assigned by driver. Efficiency of hydromechanical transmission use is estimated.
Technique of load-bearing parts design based on topological optimization method for solution of synthesis of design and force diagram of parts is considered. It is proposed to use design and force diagram synthesis at preliminary designing of parts instead of (or parallel to) design methods using prototypes and analogues. As exemplified by fork of interaxle differential lock it is shown, that using of topological optimization method often allows to develop parts of higher strength and stiffness, and simultaneously to reduce parts mass without change of material.
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