Design And Experimental Study Of New-type Negative Stiffness Damping Device

The engineering structure will produce excessive vibration response under the excitation of the earthquake,which will lead to structural damage or collapse.This poses a great threat to the personal and property safety.In order to control the structure vibration more effectively,this paper designs a new type of negative stiffness vibration damping device based on negative stiffness theory.The negative stiffness damping device connects the positive and negative stiffness springs in parallel to reduce the natural frequency of the device system while at the same time ensuring that the structural load carrying capacity does not decrease.The mechanical expression of the force and displacement can be obtained through the mechanical analysis of the deformation caused by the force of the device.The expression can be dimensionlessly processed and the displacement can be derived to find the zero stiffness condition of the system at the equilibrium position.Then determine the key parameters of the device components.Simulated seismic shaking table test and numerical simulation analysis were carried out on the parameter-optimized negative stiffness damping device.The feasibility and effectiveness of the device were verified by comparison of experimental measurements and numerical simulations.From the test results and numerical simulation results,the acceleration response and displacement response of the model structure can be effectively controlled after installation of a new type of negative stiffness vibration damping device,and the vibration reduction effect is significant.The focus of this paper is divided into the following aspects:(1)The background and significance of the paper’s research are expounded.Based on the summary of the structure damping control technology,the background of the negative stiffness mechanism and its research application status are introduced.(2)The specific structure of the new type negative stiffness vibration damping device is described in detail,and the related component parameters are optimized after the device mechanical analysis.(3)The model structure was subjected to a seismic simulation shaking table test.The damping effect of the vibration damping device was measured by comparing the test results of the pure frame and the frame structure with the negative stiffness damping device.(4)The numerical simulation analysis of the shaking table test model was performed,and the accuracy of the model structure was verified by comparing the numerical simulation results with the experimental measurement results.(5)Summing up the content of the paper’s research,and presenting the problems in the application of the device in the actual project.