METHOD FOR DETERMINING THE DYNAMIC CHARACTERISTICS OF FLEXIBLE EXTENDED STRUCTURES BY EXPERIMENT Russian patent published in 2022 - IPC G01M9/00 

FIELD: testing.

SUBSTANCE: invention relates to the field of testing machines, appliances and other technical products for resistance to external mechanical factors, and can be used in mechanical engineering, rocket and space, aircraft and other branches of engineering. Method consists in securing a flexible extended structure with oscillation sensors installed thereon on a rigid base by the method provided for the operation of said structure. A tensile force is then applied thereto in the direction of the greatest expected oscillation amplitude, then the structure is abruptly released from the effect of tensile force, free and attenuating oscillations are recorded. A tensile force is applied to the free end of the structure with a force sensor installed thereon furthermost from the securing point, in the nodes of expected natural oscillation modes, prior to releasing the structure from the force, the applied force is gradually increased to the required value and maintained for the required time, thereby forming the input spectrum of the acting force in the given frequency range, obtained by converting time signals from the force sensor, the output oscillation spectrum obtained by converting time signals from the oscillation sensors is formed. Based on the ratio of the obtained output and input spectra of recorded time signals, the compliance frequency response is then determined, used to assess the dynamic characteristics of the flexible extended structure.

EFFECT: possibility of determining the natural oscillation attenuation coefficients, the mode and frequency of natural oscillations, modal masses and modal compliances for extended items, and ensured normalisation of the frequency spectrum of force excitation and increase in the reliability of test results.

2 cl, 13 dwg