Present Status and Prospect of High-Frequency Electro-hydraulic Vibration Control Technology

AbstractElectro-hydraulic vibration equipment (EHVE) is widely used in vibration environment simulation tests, such as vehicles, weapons, ships, aerospace, nuclear industries and seismic waves replication, etc., due to its large output power, displacement and thrust, as well as good workload adaptation and multi-controllable parameters. Based on the domestic and overseas development of high-frequency EHVE, dividing them into servo-valve controlled vibration equipment and rotary-valve controlled vibration equipment. The research status and progress of high-frequency electro-hydraulic vibration control technology (EHVCT) are discussed, from the perspective of vibration waveform control and vibration controller. The problems of current electro-hydraulic vibration system bandwidth and waveform distortion control, stability control, offset control and complex vibration waveform generation in high-frequency vibration conditions are pointed out. Combining the existing rotary-valve controlled high-frequency electro-hydraulic vibration method, a new twin-valve independently controlled high-frequency electro-hydraulic vibration method is proposed to break through the limitations of current electro-hydraulic vibration technology in terms of system frequency bandwidth and waveform distortion. The new method can realize independent adjustment and control of vibration waveform frequency, amplitude and offset under high-frequency vibration conditions, and provide a new idea for accurate simulation of high-frequency vibration waveform.

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B205 High Frequency Vibration Control of HDD Head Actuator with Smart Structure

The Proceedings of the Symposium on the Motion and Vibration Control ◽

10.1299/jsmemovic.2011.12.318 ◽

2011 ◽

Vol 2011.12 (0) ◽

pp. 318-322

Author(s):

Satoshi NAKAMURA ◽

Itsuro KAJIWARA ◽

Toshihiro ARISAKA

Keyword(s):

Vibration Control ◽

High Frequency ◽

Smart Structure ◽

High Frequency Vibration

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Multiple-TMD-Based Structural Vibration Control for Pumped Storage Power Plants

Applied Sciences ◽

10.3390/app10165577 ◽

2020 ◽

Vol 10 (16) ◽

pp. 5577

Author(s):

Tengfei Zhong ◽

Xin Feng ◽

Yu Zhang ◽

Jing Zhou

Keyword(s):

Vibration Control ◽

High Frequency ◽

Power Plants ◽

Control Method ◽

Control Strategies ◽

High Order Mode ◽

Structural Vibration ◽

Power Station ◽

High Frequency Vibration ◽

Pumped Storage

The high-frequency resonance in the superstructure of a pumped storage power station (PSPP) due to the generation unit can shorten the service life of the power station structure and even endanger its safety. Although tuned mass dampers (TMDs) have been proved to be effective in controlling structural vibration, their application in PSPPs is rare, as high-frequency vibration control of PSPPs has not been studied. In this paper, a TMD control method is proposed based on PSPP high-frequency vibration and various TMD control strategies, and a set of high-frequency TMD equipment is designed. Results of a series of vibration reduction tests and numerical analyses show that the new TMD device can effectively control the high-order mode of the structure, and the bandwidth of the suppression frequency is extended, which shows the robustness and control efficiency of the device.

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613 Optimal Design and High Frequency Vibration Control of Smart Head Mechanism of HDD

The Proceedings of the Dynamics & Design Conference ◽

10.1299/jsmedmc.2010._613-1_ ◽

2010 ◽

Vol 2010 (0) ◽

pp. _613-1_-_613-6_

Author(s):

Satoshi NAKAMURA ◽

Itsuro KAJIWARA ◽

Toshihiro ARISAKA ◽

Masafumi TAKAHASHI

Keyword(s):

Optimal Design ◽

Vibration Control ◽

High Frequency ◽

High Frequency Vibration

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Analysis on vibration for a high-frequency electro-hydraulic cleaning system controlled by improved two-dimensional rotary valve

Advances in Mechanical Engineering ◽

10.1177/1687814018811412 ◽

2018 ◽

Vol 10 (12) ◽

pp. 168781401881141

Author(s):

Xiancheng Ji ◽

Yan Ren ◽

Hesheng Tang

Keyword(s):

Vibration Frequency ◽

High Frequency ◽

Functional Materials ◽

Pressure Amplitude ◽

Two Dimensional ◽

Rotary Valve ◽

Sinusoidal Vibration ◽

High Frequency Vibration ◽

Cleaning System ◽

Sinusoidal Waveform

Conventional high-frequency cleaners utilize functional materials (e.g. piezoelectric ceramics, magnetostrictive materials) excited by electrical signals to realize high-frequency vibration, even ultrasonic vibration. However, it is difficult to produce a large force without sacrificing bandwidth because of the physical characteristics of materials themselves. Therefore, a high-frequency high-power cleaner driven by electro-hydraulic excitation is proposed. Only a few studies are performed on electro-hydraulic cleaners, owing to the limitation of frequency bandwidth of the electro-hydraulic system. Thus, a rotary valve named two-dimensional valve is improved and adopted to improve high-frequency performances of the electro-hydraulic cleaner. In this article, a two-dimensional rotary valve with a linear variable differential transformer is designed, and the vibration characteristics of the electro-hydraulic cleaner controlled by this valve are discussed in detail, especially vibration acceleration, vibration frequency, and pressure amplitude. A prototype of the electro-hydraulic cleaner is modeled and both a theoretical analysis and experimental investigation are carried out. Theoretical and experimental results indicate that the electro-hydraulic cleaning system outputs sinusoidal vibration waveforms, especially in a high-frequency domain, which could realize the vibration frequency of 2669 Hz. The measured waves at different frequencies (below the resonant frequency) demonstrate different distortions compared with the sinusoidal waveform. These distortions can be associated with the hydraulic resonance. At hydraulic resonance (1903 Hz), the amplitude is increased significantly and the vibration waveform becomes more pronounced. Nevertheless, the study does provide an access to the electro-hydraulic high-frequency vibration applied in cleaning or other engineering cases.

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