RU2005131770A - METHOD FOR DETERMINING OWN SHAPES OF ELASTIC STRUCTURE - Google Patents

Claims (1)

The method for determining the natural vibration modes of an elastic structure at m given observation points B _j (j = 1, 2, 3, ..., m), in which the natural frequencies of the structural vibrations are measured, the structure is excited at several frequencies outside the vicinity of the natural frequencies, choose observation point A, in which the natural modes of vibration are conventionally taken equal to one, and measure the amplitudes of the change in the observation parameter at each of the excitation frequencies at each of m given points, as well as at the selected observation point A of the structure, yuschiysya in that the amplitude variation in each observation parameter set of m points B _{j (j} = 1, 2, 3, ..., m) and a selected observation point A is measured simultaneously, and the values of the amplitude functions

,

, ...,

determining the eigenmodes of vibration of the structure at each given point B _j , determine from the condition of minimum objective function

Where

(k = 2, 3, ..., n), y (A, Ω _i ) is the oscillation amplitude at the selected observation point A of the structure, measured at the excitation frequency Ω _i (i = 1, 2, ..., N} ; y (B _j , Ω _i ) is the amplitude of oscillations at each of the design points specified by B _j measured at the excitation frequency Ω _i ; n is the number of determined vibration modes; N is the number of excitation frequencies.