Research On NLPID To Control The Vibration Of Building Structures Under Seismic Loading

The vibration active control technology of buildings can effectively suppress the vibration of the structure, and the active control algorithm is the key to realize the active control technology. At present, the existing active control algorithms are complex and depend on objects precise mathematical model, therefor it is not suitable for the nonlinear structure. And the numerical simulation of active control of structural vibration is mostly done by MATLAB, personal finite element program is of poor universality, and numerical simulation of simplified model is one-sided. Therefore, it is necessary to seek a way that does numerical simulation of active control technology through the large general finite element software. To solve above problems, this paper’s main work and research content is:(1) This paper introduces the basic principle of PID controller, and the effect of proportion, integral and differential link with the structural vibration equation as a starting point. Multivariable decoupling process is derived based on modal decomposition method. The method for using the NLPID control technology to control the vibration of structure is analyzed as an emphasis. A 3-layer frame structure is simulated to verify the feasibility of the mode decomposition decoupling, and the results is compared with LQR control strategy.(2)The vibration equation of the nonlinear structure is introduced, and the paper analyzes the role of parameters of Bouc-Wen restoring force model.The hysteresis curve of a steel frame is obtained by ANSYS in order to show the parameters acquisition process. Genetic Algorithm(GA) has been employed to execute systematic estimation of the parameters associated with the model respectively. An 8-layer structure modeling’s reaction is simulated under the earthquake and the NLPID control. The maximum output performance and time-lag and different seismic wave are also considered in the control algorithm, and the control effect is compare with the classical LQR. Simulation results show that NLPID control for structural vibration control has a better control effect. The phase space compensation strategy used to consider the time-lag can reduce the influence of time delay.(3) The cooperative work of ANSYS and MATLAB has been proposed subsequently to give full play to the function of MATLAB calculation and dynamic analysis function of ANSYS.Simulation of an 8-layers elastic framework model and 3-layers nonlinear model with NLPID control is performed with the combining application of MATLAB and ANSYS, comparing the results with Simulink simulation results,which illustrates the use of the finite element software is necessary and verify the control effect of NLPID again in structural vibration.The research results show that the NLPID control technology applied in the vibration control of nonlinear structures is feasible, and can achieve better control effect. Application of time-delay compensation strategy can reduce delay effect on NLPID controller within a certain range. MATLAB and ANSYS can be combined to complete the simulation of structural active control by setting a running flag. Therefore, NLPID control strategy can be applied in the field of structural vibration control; Combining the two softwares can be effectively used in NLPID control simulation.