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


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.


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



Piston area


Amplitude of the excitation waveform


Discharge coefficient


Total mass of piston


Pressure drop across the load


Load pressure


System pressure


Flow through the load


Radius of the spool


Orifice area of rotary valve ports


Total volume of fluid under compression in both chambers


Excitation displacement


Overlapping of the groove and window


Peak amplitude


Displacement of the piston in the motion


Extreme peak of the excitation


Central angle of the groove


Efective bulk modulus of system


Rotary angle of the spool


Density of fluid


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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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© 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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