Title: Modelling and fault tolerance analysis of triplex redundancy servo valve

Authors: Hao Yan; Lei Yao; Li-bo Qiu; Bo Chen; Lijing Dong

Addresses: School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing, China; Key Laboratory of Vehicle Advanced Manufacturing, Measuring and Control Technology, Beijing Jiaotong University, Ministry of Education, Beijing, China ' School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing, China ' Beijing Institute of Precise Electro Mechanic Controls, China Academy of Launch Vehicle Technology, Beijing, China ' School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing, China ' School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing, China

Abstract: To investigate the stability and reliability of the triplex redundancy servo valve, a complete theoretical model needs to be built. By constructing the mathematical models of the torque motor, the armature-flapper assembly and the spool valve, the theoretical model of the triplex redundancy servo valve is deduced and the dynamic simulation method is obtained. Then, its dynamic and static characteristics are simulated and analysed by Simulink and AMEsim, respectively. The triplex redundancy servo valve may often suffer from two faults, the signal's broken circuit and full bias. Simulations show that the faults will lead to the decrease of the valve's working capability, the deviation of the valve's output, and the decline of the dynamic performance. However, the valve can still work stably and the output of the hydraulic system will not be much affected, which show the valve's favourable fault tolerance capability. Finally, the validity of the theoretical model for fault analysis is verified by an experiment.

Keywords: servo valve; triplex redundancy; fault; AMEsim; simulation.

DOI: 10.1504/IJMIC.2019.096831

International Journal of Modelling, Identification and Control, 2019 Vol.31 No.1, pp.27 - 38

Received: 29 Dec 2017
Accepted: 27 Feb 2018
Published online: 11 Dec 2018 *

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