Research On A New Direct Drive Volume Control Electro-Hydraulic Servo System Of Single-Channel Driving Device Of Flight Simulator

The flight simulator is an important tool for pilot training, aircraft development and design, which can greatly reduce the training and design cost, and also it has the characteristic of security, reliability, authenticity and so on. Hydraulic drive has become the main driving mode of a flight simulator because of the characteristics of fast response and large output. Direct drive volume control electro-hydraulic servo system is attracting more and more attention for its advantages of simple structure, energy-saving, environmental protection, and flexible control. It has been applied in the flight simulator platform in some countries.This paper aimed at hydraulic driving device of flight simulator, studied and explored a new direct drive electro-hydraulic servo system, which could balance out the effects of constant external force effectively and save energy efficiently when applied to the vertical load system; This system improves the control performance effectively since the non-asymmetric cylinder is controlled by a twin pump so that it obtains similar motion characteristics either it moves forward or back. The use of hydraulic accumulators, make it quicker for oil filling and pressure build, improved the system's response speed and bandwidth.This paper introduced the principle of the new direct drive electro-hydraulic servo system, analyzed the energy-saving effect and its performance and characteristics compare with the common direct drive electro-hydraulic servo system. In accordance with the performance requirements of a flight simulator, a test prototype of the new type of direct drive servo system has been designed and manufactured, the main components the prototype were integrated in the valve block, so that the system structure was greatly simplified. Built mathematical model of the new type of direct drive electro-hydraulic servo system, analyzed the impact of various parameters to the system performance, and did some simulation studies. Developed a system control program by means of C + + Builder. Did experimental study both with and without load, and made some analysis and interpretation to the phenomena appeared in the experiment. Experimental results show that that the system has the characteristics of fast response, high frequency response, meets the performance requirements of the flight simulator driving device, and the performance has been greatly improved compared with common direct drive electro-hydraulic servo system.