A new evaluation method on hydraulic system using the instantaneous speed fluctuation of hydraulic motor

Abstract

Instantaneous speed fluctuation of hydraulic motors is a significant physical parameter, which contains abundant information reflecting the working condition of the whole hydraulic system. Monitoring instantaneous speed fluctuation change under different operational conditions helps to reveal the performance of the system, such as flow fluctuation, oil compressibility, and internal leakage. Therefore, a new evaluation method for hydraulic systems using the instantaneous speed fluctuation of the hydraulic motor is proposed in this paper. The proposed method includes measurement of the instantaneous speed and instantaneous speed fluctuation extraction. By means of the software counting algorithm, the instantaneous speed of the hydraulic motor can be obtained based on data acquisition card and industrial personal computer. The process of the instantaneous speed fluctuation extraction adopts order analysis, which converts the instantaneous speed signal from the time domain to the angle domain. Moreover, by tracking the order spectrum, the instantaneous speed fluctuation change under varying operational conditions can be identified. The effectiveness of the proposed method was validated by experiments under different working conditions. The experimental results show that the instantaneous speed fluctuation of the hydraulic motor can analyze the performance change of the hydraulic system with different motor speeds, loads, and moments of inertia, which provides a new method to evaluate the operational states of hydraulic systems.

Keywords

Hydraulic motor instantaneous measurement instantaneous speed fluctuation order spectrum analysis operation state evaluation

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