Experimental Research for the Modes of the Thin Circular Rings with Imperfection of Periodically Variale Radius
Aiming at the problem of in-plane vibration mode of the constant thickness circular ring with variable radius normal direction,according to the theory of vibration testing,an experimental method of fixed measurement point and variable excitation point is proposed to simplify the experimental operation process.The natural frequency and mode shape of the first eight order vi-bration of the ring with variable radius are obtained by using the laser Doppler vibrometer and the LMS vibration testing system.The results are compared with the finite element simulation and the relevant conclusions in the existing literature,and the feasibil-ity of the experimental method is verified.The natural frequency splitting law of the research object under the different relationship between the radius change period p and the mode order n is summarized,and the variation amplitude of normal thickness h and radius is studiedΔinfluence on the natural frequency of the ring.
NETL
NSTL
万方数据
维普
