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Journal of Mechanical Science and Technology

, Volume 33, Issue 11, pp 5157–5167 | Cite as

Output characteristics of a horizontal type electro-hydraulic excitation system with inertial loading: Modeling and experimentation

  • Ren Yan
  • Ji Xiancheng
  • Ruan JianEmail author
Article
  • 4 Downloads

Abstract

In a conventional electro-hydraulic excitation system it is difficult to realize high frequency vibration, even though at the cost of a decreased hydraulic force. A 2D rotary valve, characterized by the spool’s simultaneous rotary and sliding motions, was improved and adopted in a horizontal type electro-hydraulic excitation system in order to improve its high frequency performance. A description of vibration characteristics is still a challenge for the excitation system with inertial loading subjected to high frequency excitation. Therefore, this paper investigated the output characteristics of this electro-hydraulic excitation system in detail. A mass force dominant excitation system was taken as an example to demonstrate those output characteristics, which was facilitated by a specially designed approximate phenomenological model. Based on this model, the analytical expressions of the excitation waveform, working frequency and some boundary values were derived and subsequently shown to be in line with the experimental data. Theoretical and experimental results indicate that the output excitation waveforms could be described using the analytical expressions, even though the measured waves demonstrate different distortions. The distortions are especially obvious when the operating frequencies are below the resonant frequency, while they are attenuated as the frequencies increase beyond the resonance. This noteworthy phenomenon is one of the manifestations of hydraulic resonance. These results and findings provide clear guidance for the understanding and designing of the electro-hydraulic excitation system with high frequency feature.

Keywords

Horizontal type electro-hydraulic excitation Rotary valve Output characteristics Phenomenological model 

Nomenclature

Ap

Piston area

A

Amplitude of the excitation waveform

Cd

Discharge coefficient

mt

Total mass of piston

PL

Pressure drop across the load

PL

Load pressure

ps

System pressure

QL

Flow through the load

r

Radius of the spool

sv

Orifice area of rotary valve ports

Vt

Total volume of fluid under compression in both chambers

yp

Excitation displacement

yv

Overlapping of the groove and window

ymax

Peak amplitude

ya/b/c/d

Displacement of the piston in the motion

ye

Extreme peak of the excitation

a

Central angle of the groove

βe

Efective bulk modulus of system

θ

Rotary angle of the spool

p

Density of fluid

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Notes

Acknowledgments

This work was supported by the National Natural Science Foundation of China (Nos. 51805376, U1709208), the Zhejiang Special Support Program for High-level Personnel Recruitment of China (No. 2018R52034), and the Wenzhou Basic Scientific Research Foundation of China (No. 2018G0183).

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Copyright information

© KSME & Springer 2019

Authors and Affiliations

  1. 1.College of Mechanical and Electrical EngineeringWenzhou UniversityWenzhouChina
  2. 2.College of Mechanical EngineeringZhejiang University of TechnologyHangzhouChina

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