A Design Method of Low-Frequency Vibration Reduction and Isolation for a Wide Range of Static Load

摘要

In order to achieve effective reduction and isolation of low-frequency vibration and noise, this paper investigates a shell-type structure element for the design of quasi-zero-stiffness (QZS) isolators. By means of nonlinear buckling technology, the structure element can be turned into a QZS structure under the static load so as to possess the ability of low-frequency vibration reduction and isolation. First of all, the buckling characteristics of the structure element are researched by using the finite element method. Then the effects of the geometric parameters of the structure element on the working load range with the low structure stiffness are summarized for the design of the QZS systems. Finally, the compound systems composed of multi shell-type structure elements in series or in parallel are constructed, and the relationship between the performances of the compound system and those of the structure element is presented, including the stiffness value and the bearing load range with the low structure stiffness.