VIBRATION MONITORING OF DISPLACEMENT UNITS IN HYDRAULIC SYSTEMS Russian patent published in 2015 - IPC G01M7/00 

FIELD: instrumentation.

SUBSTANCE: prior to analysing hydraulic drive components to be tested, first, character of vibration signals is defined for those picked up at sound units composed of new and repaired units to compose the data base ranked by types and brands of said units (N new and M repaired units). For this transducers secured at tested object structure are used to register and to process the amplitude-frequency spectrum in rated-mode operation. Ideal unit frequency spectrum oscillation signal amplitude will be calculated with due allowance for amplitudes of new and repaired units in a narrow band of frequencies and for their quantity. Therefore, definite-type ideal unit frequency spectrum is created in data base from spectra of sound units and defined are zones of oscillation control corresponding to various conditions of the units. In testing, measured spectra of analysed object and ideal object are compared to conclude on availability of absence of faults.

EFFECT: expanded range of diagnostics, possibility of diagnostics in closed housing with no access to assembly units and parts, higher accuracy.

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