用于高温管道的二重动力吸振器设计及力学性能试验OA北大核心CSTPCD

In view of the fact that it was difficult to solve the problem of irregular vibration of small and medium-sized branch pipes in nuclear power units with traditional vibration damping supports,a circular double three-way dynamic vibration absorber based on metal rubber material was designed in this study,with total mass of 0.084 kg,and the rectangular spring and metal rubber were fixed between the mass and the tooling fixture.Firstly,the dynamic model of the double dynamic vibration absorber was constructed,and then the equivalent mass of the small branch was determined by the mass induction method,and the stiffness and damping ratio of the vibration absorber were optimized by combining the fixed-point theory.The harmonic response simulation analysis of the small branch tube double dynamic vibration absorber system showed that the vibration absorption effect of the double dynamic vibration absorber in the X,Y and Z directions was greater than 95%.The excitation test was carried out on the small branch tube with or without the double dynamic vibration absorber,the sinusoidal excitation amplitude was 5 N,and the frequency range was 0 to 150 Hz,and the data showed that the vibration absorption effect of the doub-le dynamic vibration absorber for the main vibration direction of the small branch tube Y and Z reached more than 95%,and the vibration absorption efficiency in the X direction reached more than 75%.