Effect of sink flow on dual-valve electro-hydraulic excitation system

Meng, Zhen; Wu, Chuan-yu; Ni, Jian

doi:10.21595/jve.2016.16589

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…It includes slide valve control type [7], rotary valve control type [8][9] and 2D valve control type [10]. By adjusting the switch signal of the multistage parallel slide valve, the slide valve controlled electro-hydraulic excitation equipment vibrates [11]. The rotary valve controlled electrohydraulic excitation equipment vibrates through the alternating flow of the relative rotation of valve core and valve sleeve [12].…”

Section: Introductionmentioning

confidence: 99%

Study on Vibration Characteristics of Electro-Hydraulic Excitation System Controlled by Alternating Flow Distribution Rotary Valve

Zhao,

Yin,

Zhou

et al. 2023

IEEE Access

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Taking advantage of the superiority of valve controlled electro-hydraulic excitation system with wide vibration frequency and adjustable amplitude, a rotary valve controlled electro-hydraulic excitation system is proposed. The structural composition of system and the excitation principle of alternating flow distribution due to rotary valve are formulated. The system mathematical model is derived and a simulation model is constructed based on Matlab/Simulink, and the accuracy of the simulation model is verified by prototype experiments. In accordance with this model, the influence law of main structural parameters of rotary valve and excitation hydraulic cylinder on the vibration characteristics of electrohydraulic excitation system are indicated. The results reveal that the system vibration waveform obtained from model simulation and prototype experiment are almost identical with only 8.97% error. The effective length of spool groove and the spool radius increased, the system vibration displacement improved. The number of oil grooves increased, the system vibration frequency expanded. With the increase of the spool radius, the vibration displacement of the system increases greatly and the vibration characteristics of the system has affected significantly. The effective working area of hydraulic cylinder piston and equivalent mass increased, the system vibration displacement decreased. The vibration characteristics of the system have remarkable adjustability and prominent working output characteristics.

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Section: Introductionmentioning

confidence: 99%

Study on Vibration Characteristics of Electro-Hydraulic Excitation System Controlled by Alternating Flow Distribution Rotary Valve

Zhao,

Yin,

Zhou

et al. 2023

IEEE Access

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show abstract

“…In the first approach, multiple heterogeneous parallel valves are operated using a time-sharing approach. 4 – 6 For example, Bai and Quan 5 proposed a new hydraulic control circuit with two valves arranged in parallel for jointly controlling the actuator. Ren and Ruan 6 used an improved two-dimensional valve as the primary control component, which was connected in parallel with a servo valve to obtain high-frequency vibration.…”

Section: Introductionmentioning

confidence: 99%

Dual-valve parallel prediction control for an electro-hydraulic servo system

Zhu

et al. 2019

Science Progress

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To improve the dynamic response performance of a high-flow electro-hydraulic servo system, scholars have conducted considerable research on the synchronous and time-sharing controls of multiple valves. However, most scholars have used offline optimization to improve control performance. Thus, control performance cannot be dynamically adjusted or optimized. To repeatedly optimize the performance of multiple valves online, this study proposes a method for connecting a high-flow proportional valve in parallel with a low-flow servo valve. Moreover, this study proposes an algorithm in which a proportional–integral–derivative system and multivariable predictive control system are used as an inner loop and outer loop, respectively. The simulation and experimental results revealed that dual-valve parallel control could effectively improve the control accuracy and dynamic response performance of an electro-hydraulic servo system and that the proportional-integral-derivative–multivariable predictive control controller could further dynamically improve the control accuracy.

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Experimental Study on the Performance of Hydraulic Vibration Assisted Broaching (HVAB) Based on Piezoelectric Sensors

Meng

Shi

et al. 2018

Sensors

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In order to improve the keyway broaching process and verify the feasibility of vibration-assisted broaching process, an experimental study on a novel hydraulic vibration assisted broaching (HVAB) system with double-valve electro-hydraulic exciter (DVEHE) is proposed in this paper. The performances of HVAB at different excitation frequencies were compared from three aspects: (a) the cutting force under the different vibration frequencies, (b) the surface roughness of the workpiece, and (c) the flank face wear of the tool. For precision on-line measurement of larger broaching forces, four piezoelectric sensors were fixed on the broaching machine. The experimental results show that HVAB can effectively improve the performance of the broaching process, approximately reduce the broaching force by as much as 9.7% compared to conventional broaching (CB) and improve the surface quality of workpiece. Some explanations are offered to support the observations.

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Effect of sink flow on dual-valve electro-hydraulic excitation system

Cited by 3 publications

References 19 publications

Study on Vibration Characteristics of Electro-Hydraulic Excitation System Controlled by Alternating Flow Distribution Rotary Valve

Study on Vibration Characteristics of Electro-Hydraulic Excitation System Controlled by Alternating Flow Distribution Rotary Valve

Dual-valve parallel prediction control for an electro-hydraulic servo system

Experimental Study on the Performance of Hydraulic Vibration Assisted Broaching (HVAB) Based on Piezoelectric Sensors

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