《彩广立毕业设计外文文献》.pdf

¯ ¯ Sadhana Vol. 31, Part 5, October 2006, pp. 543–556. © Printed in India Effect of bulk modulus on performance of a hydrostatic transmission control system ALI VOLKAN AKKAYA Yildiz Technical University, Mechanical Engineering Department, 34349, Besiktas, Istanbul, Turkey e-mail: aakkaya@yildiz.edu.tr MS received 9 September 2005; revised 20 February 2006 Abstract. In this paper, we examine the performance of PID (proportional integral derivative) and fuzzy controllers on the angular velocity of a hydrostatic transmission system by means of Matlab-Simulink. A very novel aspect is that it includes the analysis of the effect of bulk modulus on system control. Simulation results demonstrates that bulk modulus should be considered as a variable parameter to obtain a more realistic model. Additionally, a PID controller is insufficient in presence of variable bulk modulus, whereas a fuzzy controller provides robust angular velocity control. Keywords. Hydrostatic transmission; bulk modulus; PID (proportional integral derivative); fuzzy controller. 1. Introduction Hydrostatic transmission (HST) systems are widely recognized as an excellent means of power transmission when variable output velocity is required in engineering applications, especially in field of manufacturing, automation and heavy duty vehicles. They offer fast response, maintain precise velocity under varying loads and allow improved energy efficiency and power variability (Dasgupta 2000; Kugi et al 2000). A basic hydrostatic transmission is an entire hydraulic system. Generally, it contains a variable-displacement pump driven by an induction motor, a fixed or variable displacement motor, and all required controls in one simple package. By regulating the