308 / 2021-04-27 09:47:23

Study on vibration transmission characteristics of liquid filled double cylindrical shell with spring

Double cylindrical shell; Water medium; Elastic connection; Liquid filling

In order to study the vibration isolation characteristics in water, based on Flügge theory, a finite length double cylindrical shell model with spring connection is established using wave propagation method.The reliability of the theoretical method is verified by comparing the calculation results of the mean square velocity of the inner and outer shell with those of the finite element method.The effects of spring stiffness,spring position, shell thickness, sandwich fluid and its thickness, sandwich fluid and spring stiffness on the vibration transmission of inner and outer shells are studied.The results show that the natural frequency and vibration amplitude of the shell will be reduced by the water medium inside and outside the cabin, and the effect of fluid load of water medium inside the cabin is stronger than that of the water medium outside the cabin;The "vibration short circuit" of the water medium between the inner and outer shell reduces the vibration isolation performance of the vibration isolator; When the interlayer medium is air, the spring is the main vibration transmission channel; When the sandwich medium is water, the water is the main vibration transmission channel, and the spring with smaller stiffness can restrain the vibration transmission between the inner and outer shell to a certain extent.