Abstract
The internal leakage of hydraulic cylinder severly effects the normal operation running of hydraulic system. At present, the diagnosis approaches of internal leakage of hydraulic cylinder still have some problems. It is to make test slow when leaking or it is difficult to diagnosis when leaking weakly. A method to determine internal leakage using pressure change characteristics is proposed. Based on hydraulic system simulation software Automation Studio 6.1, this paper makes simulation analysis on normal status and fault status of hydraulic system operation, aiming to achieve time domain and frequency domain features. Accompanying with experimental test, the results of simulation are consistent with experiment results, which provides a new way for the detection for internal leakage of hydraulic cylinder.
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