Research On Performance Optimization And Vibration Control Of Pendulum Tuned Mass Damper

With the increasing people's concern over the safety and reliability of large infrastructure structures such as Bridges in society,Structural Vibration Control Technology has become a hot research field about multidisciplinary cross.Structural vibration could be effectively controlled by mean of installing some active or passive energy dissipation devices to change the stiffness,damping and other parameters of the structure or to provide active control force against disturbance,so,It is of great significance for ensuring the safety of key structures,avoiding the occurrence of major catastrophic accidents,and ensuring the safety of people's lives and property.Based on the research background of the National Natural Science Foundation of China,aim at the optimization design,evaluation,control and bridge vibration reduction of Pendulum Tuned Mass Damper(PTMD),this dissertation focused on multi-degree of freedom dynamics modeling,parameter performance and optimization solution,parameter estimation by extended Kalman filter,multi-frequency tuning control and multi-PTMD vibration reduction simulation under dynamic bridge load,etc.The research has achieved good results and obtained some innovative research achievements.The research works and main contributions are listed as follows:(1)Starting from the analysing five degree of freedom model of the coupling motion between the structure and PTMD,the response and dynamic equation of the multidegree of freedom PTMD and the state space equation of the system could be established according to the kinetic energy,potential energy and dissipation function by Lagrange equation,the three-dimensional characteristics of PTMD were analysed based on two generalized coordinates of the plane rotation and the spherical motion.The parameters of nonlinear auxiliary damping and equivalent linear viscous damping are derived,which provides theoretical basis for the analysis of the following chapters.(2)A kind of numerical search algorithm for the optimal damper parameters for the linearized plane PTMD is proposed based on the response analysis of multi-degree-offreedom PTMD,which had a better effect than simply increasing the system mass ratio For a system with a large mass ratio.For a system with a large mass ratio,due to the increase of the coupling effect of the main and auxiliary systems,the detuning sensitivity is reduced.This algorithm can also estimate a better auxiliary damping ratio than the traditional method.The parameter optimization of the imperial competition algorithm based on geopolitical strategy and wavelet mutation are both studied in this researched.(3)A kind of multiple parameter estimation algorithm is proposed based on extended kalman filter.This algorithm has realized that the natural frequency,modal damping ratio and mode shape of the structure can be effectively estimated when the damper is working normally,which eliminates the interference caused by its own response to the system structure dynamic characteristics and overcomes the need to stop the additional damper in the traditional way.So,it provides technical support for online implementation.(4)Focusing on the structural modal characteristics,an estimation method based on extended Kalman filter is proposed,which introduces the structural modal characteristic estimation algorithm into the estimation of effective damping.When the controlled frequency of the structure cannot be accurately known,the system acceleration response can be used to evaluate the performance of the in-service tuned damper.(5)A kind of PTMD system based on Stewart platform was developed and its kinematics analysis was carried out.The chaos analysis of the acceleration signal of the Stewart platform was researched and the chaos time series were recognized in this dissertation,which was actively explored in chaos theory combined with PTMD.Each module of the PTMD hydraulic control system was model and the active control scheme of multi-frequency tuning was proposed,Finally,by means of the control system simulation,the same damping effect of using a smaller mass to achieve a large mass passive TMD was achieved,which improved the PTMD system Damping efficiency.(6)The simulation comparative analysis of single PTMD with different mass ratio and multiple PTMD with different mass ratio was carried out by taking the railway bridge as the specific object.The related simulation analysis verifies the feasibility and effectiveness of the algorithm proposed in this dissertation.This part of the research work reflects the good significance of technical methods,and provides a certain technical method support for the practical application of related theoretical methods.