Title: Design and experiment of novel piezoelectric double nozzle flapper electro-hydraulic servo valve

Authors: M.L. Zhou; W. Gao; Y.T. Tian; Z.G. Yang

Addresses: College of Communication Engineering, Jilin University, Changchun, 130022, China ' College of Communication Engineering, Jilin University, Changchun, 130022, China ' College of Communication Engineering, Jilin University, Changchun, 130022, China ' College of Machinery Science and Engineering, Jilin University, Changchun, 130022, China

Abstract: To improve the performance of the existing nozzle flapper type electro-hydraulic servo valve, a novel piezoelectric double nozzle flapper electro-hydraulic servo valve (PDNFESV) is proposed. An electricity-machine transducer is designed to replace the torque motor in the traditional nozzle flapper servo valve. The electricity-machine transducer is constructed by two identical piezoelectric bimorphs and a beryllium bronze board. The design and fabrication of the electricity-machine transducer is introduced. The structure and work principle of the novel PDNFESV is analysed. The static and dynamic characteristic of the electricity-machine transducer are tested, the experimental results show that the designed electricity-machine transducer can meet the demand of the novel PDNFESV. At last, the performance indexes of the novel PDNFESV are researched.

Keywords: piezoelectric bimorphs; electricity-machine transducers; vibration mode; hysteresis loop; electrohydraulic servo valves; nozzle flapper servo valves; beryllium bronze boards.

DOI: 10.1504/IJMPT.2012.051330

International Journal of Materials and Product Technology, 2012 Vol.45 No.1/2/3/4, pp.41 - 52

Published online: 18 Sep 2014 *

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