Gaps control in movable joints by the results of resonance test

Gaps in mobile connections of mechanisms and effort transfer systems or movements lead to a mismatch between operating signal and reaction of the controlled object to this signal. Therefore the extended gaps become the defects of these structures. In this work the authors solve the problem of such gaps control by results of mechanisms resonant testing and systems. It allows to carry out defects detection without the structure dismantling and the subsequent instrumental inspection of its details sizes. The accelerations sensors are installed in connections places for defects detection. In a vicinity of the phase resonance frequency of the object control by the signals of sensors there constructed the Lissazhu figures, which are ellipses for ideal system. The gaps existence in connections is determined by deviations of Lissazhu figures from the elliptic form. The maximum deviations of Lissazhu figures correspond to the defective connections. Formulas for the assessment of gaps sizes by characteristic values of resonant frequencies are received. The efficiency of the developed technique is illustrated on the gaps control example in mechanical control wiring by the Su-34 plane. This technique can be used in the transmissions control of helicopters and cars, aircrafts mechanical control wiring.