Affiliations: [a] Laboratory of Low Emission Vehicle, Beijing Institute of Technology, Beijing, China | [b] Qinggong College, North China University of Science and Technology, Tangshan, Hebei, China | [c] Beijing Benz Automotive Company, Beijing, China
Correspondence:
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Corresponding author: Youtong Zhang, Laboratory of Low Emission Vehicle, School of Mechanical Engineering, Beijing Institute of Technology, 5# Zhongguancun South Street, Beijing 100081, China. Tel.: +86 01068915013; Fax: +86 01068915013; E-mail: youtong@bit.edu.cn
Abstract: In order to solve the contradiction between the opening and closing time of the high speed on/off valve for space propulsion systems of the liquid rocket engine, a pneumatic pilot-operated high speed on/off valve is proposed and multiobjective optimization for the opening and closing time of the valve is carried out in this paper. Based on the analysis of the working mechanism of the valve, the mathematical models for the pilot valve and the main valves are established respectively. The Plackett-Burman design is used to select the optimization variables which influence the performance of the response time significantly. The central composite design is used to obtain the sample points and establish second-order response surface models of the response time. The NSGA-II is used to obtain the Pareto front of the optimization objectives. The optimized opening and closing time can be reduced by 17.7% and 37.4% respectively. A prototype based on the optimized parameters is manufactured and tested to verify the accuracy of the multiobjective optimization results. The test results verify the validity of the optimization approach for the proposed valve in this paper.
Keywords: Multiobjective optimization, pneumatic pilot-operated high speed on/off valve, response surface model, response time, solenoid valve
