Acoustic method for diagnosing microcracks of high-pressure hoses of hydraulic drive machines in operation.

In road building, industrial, agricultural and other hydraulically driven machines, hydraulic shock occurs which causes the formation of micro-cracks in the high pressure hoses inner sheath, provoking premature hose pipes failure and unauthorised ejection of hydraulic oil into the atmosphere with consequent environmental pollution. There are methods to protect the hydraulic drive based on the principle of automatic disconnection of hydraulic oil supply in case of hose pipes damage. However, the known protection methods do not completely solve the mentioned problem, since the hydrodynamic alternating loads caused by a hydraulic shock, when the locking device of the hydraulic drive protection system is triggered, not only destroy hose pipes, but also lead to an oscillatory process of the locking device gate, the increase in the damaged hydraulic line overlap time and, as a consequence, to the increase of the hydraulic oil losses. To eliminate the above disadvantages, the known devices parametric characteristics theoretical and experimental research was carried out; a new technical solution based on an acoustic method for microcracks diagnosing on the hydraulic line inner shell with subsequent operator informing about the fault and automatic shutdown of hydraulic oil supply, was developed and patented by the authors. [ABSTRACT FROM AUTHOR]

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