Study on Variable Resonant Technology of Electro-hydraulic Fatigue Test System

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (7) : 10-14.

Jia Wenang1 Ruan Jian1

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Abstract

The amplitude of the exciting output force in electro-hydraulic fatigue testing machining will attenuate with the increasing exciting frequency. There is a confliction between amplitude and exciting frequency. Therefore, a novel scheme using the resonant power is proposed to enhance the amplitude in high exciting frequency. A single rod cylinder control by 2D exciting valve is used and the resonant frequency of system varies with the volume of no-rod chamber cylinder. The resonant power can be excited and enhance the amplitude while the resonant frequency matches the exciting frequency. The hydraulic power mechanism is simplified based on the analysis of system structural and motion. A mathematical model of the hydraulic power mechanism for the proposed vibration exciter was established to investigate the relationship between the volume of no-rod chamber and resonant frequency, as well as the amplitude at various frequencies. An experimental system was built to validate the theoretical analysis. It is verified that the resonant frequency can be controlled by no-rod chamber’s volume in cylinder. The amplitude is 25% of the maximum amplitude in low exciting frequency while the system excited in resonant frequency, and the flow rate from oil source reduces to 10% of the maximum flow rate. Therefore, the application scope of the electro-hydraulic fatigue test can be broaden and the exciting frequency can be broaden in electro-hydraulic fatigue test used in high load test and save energy by using the resonant energy.

Key words

electro-hydraulic;fatigue test / resonant frequency / 2D exciter valve / variable Resonant

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Jia Wenang1 Ruan Jian1. Study on Variable Resonant Technology of Electro-hydraulic Fatigue Test System[J]. Journal of Vibration and Shock, 2016, 35(7): 10-14

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