Search Results

This paper gives a new approach for fluid-structure interaction of servovalve component actuator using finite element method. FE approach gaining a more advancement in dynamic analysis of structural components. For fluid flow analysis, computational fluid dynamics software’s like fluent were frequently used. The fluid-structure interaction is challenging issue in finite element field. An attempt has been made to interact hydraulic component piston and cylinder with fluid using special purpose hydrostatic fluid elements along with general-purpose solid elements. The positioning of piston depends upon the flow rate from control ports and the amount of load to be moved. In this paper an emphasis was made on actuator dynamics for different fluid property. The fluid property like fluid bulk modulus, expansion coefficient plays the major role in all type of hydraulic components. Bulk modulus of fluid changes drastically due to the entrapment of air bubbles in the fluid.

The pressure gain characteristics of jet pipe servovalve is required as an input to the designer for improving performance of the servovalve. An attempt has been made to design the first stage jet pipe servovalve parameters to get maximum pressure recovery. The static recovery pressure in receiving holes is a function of jet pipe nozzle displacement relative to receiver plate. The recovery pressure depends on web thickness, jet pipe nozzle diameter, receivers hole diameter, nozzle offset and nozzle stand-of distance. A detailed static recovery pressure analysis of a two stage, four-way, closed ports electrohydraulic flow control valve considering the effect of web thickness, nozzle diameter, receiver hole diameter and offset parameters are presented in the paper. Also the effect of supply pressure on recovery pressure is presented.