Structural Dynamics Analysis And Optimization Based On The Electrical Circuit Analogy Method

With the development of social economy in our country,the building structure is increasing,and in the design of building structure engineering,the dynamic performance of the structure analysis of the role of the occupying the ease,the existing engineering field,almost all of the fields used structure dynamic analysis problems.The object of study in civil,mechanical,such as transportation,aviation and aerospace engineering fields.In the structure under dynamic load response and performance analysis.Mainly by the known structure and dynamic load to calculate the response of the structure,to determine the structure of the bearing capacity and dynamic characteristics,provide the basis for improving performance,reasonable structure design.Structural dynamic analysis should not only consider the dynamic load and response change with time,and consider the inertial force of structure due to vibration and damping force.Dynamic loads on the structure,the vibration of the structure is called forced vibration.Structural dynamic system and circuit system in mathematical expressions have the same form,this same expression in some sense reaction in both common law.The paper circuit simulation method for the theoretical research,and the specific examples to carry on the numerical simulation calculation。Its core is to find a new platform for the modeling and simulation and optimization,and optimization parameters on the experiment platform.This article main research contents as follows:1.To study the structural dynamic analysis method,and introduces one of the most commonly used method of numerical calculation and experimental simulation method,and the circuit simulation research progress at home and abroad are reviewed. 2.Including Kirchhoff’s law used to export the equivalent circuit diagram and the quality factor of errors may lead to the experimental results,etc.In addition,the structure dynamic equation is established,and gives the circuit simulation of two types: impedance and admittance method.3.The structure of single degree of freedom is established mechanical model,deduced the corresponding structure dynamic equation,due to structural dynamics equation and circuit equation has the same form of differential equations,using circuit simulation method,the structural dynamic system of mechanical quantity and amount of electrical analogy circuit system,get the circuit equation,through the Kirchhoff’s law.Using SAP2000 solves structural dynamic equation,and solves the structure response information;At the same time,the simulation software is used to analyze the corresponding analog circuit,electrical quantities,comparing the results of two methods,verified the model method in solving the problem of structural dynamic accuracy and feasibility.4.According to the Kirchhoff’s law of equivalent circuit diagram,the analogy with the corresponding electrical components to build circuit,input the corresponding excitation source,finally through the oscilloscope at the ends of the measured capacitance voltage curve,will be the result of the experiment and the results of numerical calculation methods are compared,and the experimental results of error was analyzed,and the exclusion of instruments and components of itself after the error of the experimental results are in good fitting.Visible,circuit experiment can directly obtain the corresponding structural dynamic response.5.On the basis of the experimental platform for structural parameters optimization.