Effect of O-ring Deformation on Saturated Load Pressure of the Small Piezoelectric-Hydraulic Pump Brake System

Abstract

This paper examines the effect of deformation of the O-ring on maximum pressure in the load side of the small piezoelectric-hydraulic pump brake system. In the previous study, the small piezoelectric-hydraulic pump braking system used for small- and medium-sized unmanned aerial vehicles was developed. To operate the brake system, load pressure must be formed. The magnitude of the load pressure is determined by the pressure in the chamber and the adapted check valve type. Therefore, a study of the parameters affecting the chamber pressure is necessary to improve the load side pressure. The volume change of the O-ring seal has a complicated effect on the maximum pressure in the chamber of the piezoelectric-hydraulic pump. Accordingly, this study analyzed the effect of the O-ring on chamber pressure, considering the changing volume of the O-ring seal with nonlinear property material. The deformation of the O-ring made of nitrile-butadiene rubber was investigated using the finite-element method. In addition, the optimal radius of the piston was determined to obtain the maximum chamber pressure. The obtained maximum pressure and optimal radius are verified by comparison with the pressurization experiment using the developed small piezoelectric-hydraulic pump brake system.