Numerical study on hydrodynamic oscillation and forced vibration in front stage of pressure servo valve

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (13) : 120-128.

KANG Jian1, YUAN Zhaohui1, WANG Jiangtao2

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Abstract

Electro-hydraulic pressure servo valve is an important control element in aircraft braking control system. The stability of its output pressure can directly affect stable landing of aircraft. Its armature-deflector assembly is subject to unsteady hydrodynamic force, it is easy to cause forced vibration and high frequency noise. Under the action of high-cycle alternating hydrodynamic force, the stiffness of spring tube in the assembly can gradually drop to seriously affect dynamic performance of the servo valve. Here, in order to find out the source of forced vibration of the armature-deflector assembly, a 3D fluid-structure coupled model of the front stage was established. According to the evolution law of vortex and cavitation morphology, amplitude and frequency of hydrodynamic pulsation under different deflection displacements were numerically analyzed. Structural response characteristics of the armature-deflector assembly under high frequency periodic external load were analyzed. Finally, it was concluded that periodic changes of vortex and cavitation cause the armature-deflector assembly to produce high frequency hydrodynamic vibration; the asymmetric structure of front stage and hydrodynamic pulsation are necessary conditions to cause forced vibration of the armature-deflector assembly.

Key words

armature-deflector assembly / fluid-solid coupling / hydrodynamic oscillation / forced vibration

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KANG Jian1, YUAN Zhaohui1, WANG Jiangtao2. Numerical study on hydrodynamic oscillation and forced vibration in front stage of pressure servo valve[J]. Journal of Vibration and Shock, 2021, 40(13): 120-128

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