Effect of Oil Viscosity on Self-Excited Noise Production Inside the Pilot Stage of a Two-Stage Electrohydraulic Servovalve

Author:

Chen Meng12,Aung Nay Zar3,Li Songjing4,Zou Changfang5

Affiliation:

1. Department of Fluid Control and Automation, Harbin Institute of Technology, Science Park, No. 2, Yikuang Street Nangang District, Box 3040 Harbin 150001, China;

2. MCC Huatian Engineering & Technology Corporation, No.18, Fuchunjiangdong Street, Jianye District, Nanjing 210019, China, e-mail:

3. Department of Mechatronic Engineering, Yangon Technological University, 3rd Floor, TRC Builiding, YTU Campus, Insein Road, Yangon 11181, Myanmar e-mail:

4. Department of Fluid Control and Automation, Harbin Institute of Technology, Science Park, No. 2, Yikuang Street Nangang District, Box 3040 Harbin 150001, China e-mail:

5. MCC Huatian Engineering & Technology Corporation, No.18, Fuchunjiangdong Street, Jianye District, Nanjing 210019, China e-mail:

Abstract

The occurrence of self-excited noise felt as squealing noise is a critical issue for an electrohydraulic servovalve that is an essential part of the hydraulic servocontrol system. Aiming to highlight the root causes of the self-excited noise, the effect of oil viscosity on the noise production inside a two-stage servovalve is investigated in this paper. The pressure pulsations' characteristics and noise characteristics are studied at three different oil viscosities experimentally by focusing on the flapper-nozzle pilot stage of a two-stage servovalve. The cavitation-induced and vortex-induced pressure pulsations' characteristics at upstream and downstream of the turbulent jet flow path are extracted and analyzed numerically by comparing with the experimental measured pressure pulsations and noise characteristics. The numerical simulations of transient cavitation shedding phenomenon are also validated by the experimental cavitation observations at different oil viscosities. Both numerical simulations and experimental cavitation observations explain that cavitation shedding phenomenon is intensified with the decreasing of oil viscosity. The small-scale vortex propagation with the characteristic of generating, growing, moving, and merging is numerically simulated. Thus, this study reveals that the oil viscosity affects the transient distribution of cavitation and small-scale vortex, which, in turn, enhances the pressure pulsation and noise. The noise characteristics achieve a good agreement with pressure pulsation characteristics showing that the squealing noise appears accompanied by the flow field resonance in the flapper-nozzle. The flow-acoustic resonance and resulting squealing noise possibly occurs when the amplitude of the pressure pulsations near the flapper is large enough inside a two-stage servovalve.

Funder

National Natural Science Foundation of China

Publisher

ASME International

Subject

Mechanical Engineering

Reference32 articles.

1. Degradation Assessment and Life Prediction of Electro-Hydraulic Servo Valve Under Erosion Wear;Eng. Fail. Anal.,2014

2. Dynamic Response of a Hydraulic Servo-Valve Torque Motor With Magnetic Fluids;Mechatronics,2007

3. Influence of Magnetic Fluids on the Dynamic Characteristics of a Hydraulic Servo-Valve Torque Motor;Mech. Syst. Signal Process.,2008

4. Weber, S. T., Porteiro, J. L., Rahman, M. M., Pennington, R. E., and Musallam, A. E., 1998, “Self-Sustaining Flow Oscillations in Counterbalance Valves,” Bath Workshop on Power Transmission and Motion Control, pp. 207–217.

5. Depression of Self-Excited Pressure Oscillations and Noise in the Pilot Stage of a Hydraulic Jet-Pipe Servo-Valve Using Magnetic Fluids;Adv. Mater. Res.,2012

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