Design And Implementation Of Distributed Dynamic Load Identification Analysis And Evaluation System

As the second category of inverse problem,the dynamic load identification technology has important theory value and vast application prospect in engineering practice.In this paper,form the engineering practice requirement,the system of distributed dynamic load identification and evaluation is designed and developed,based on the LabVIEW virtual instrument platform and the technology of distributed dynamic load identification which is based on modal coordinate transformation.In this article,begin with the theoretical basis of the system,the dynamic load identification technology of one-dimensional structure of continuous beam and two-dimensional structure of elastic thin plate based on modal coordinate transformation theory is introduced in detail,and after the evaluation method of structural similarity is proposed and applied to evaluate the load identification results.The system is developed by Lab VIEW,and adopts the design idea of the top down and modular programming method.In this way,it has better universality,portability and practicability compared with the previous load identification software.Besides,the system is written the corresponding module of real time data acquisition,display,analysis,storage,recall,management,etc,form the practical requirements.In addition,according to different load types,concentrated dynamic load and distributed dynamic load,the dynamic load identification modules of one-dimensional structure of continuous beam and two-dimensional structure of elastic thin plate are designed and developed.And the system uses a variety of assessment methods to evaluate the identification results include waveform similarity,structural similarity,etc.Finally,an experiment of distributed dynamic load identification on thin plate is designed to assess the correctness of each module and the whole system.In conclusion,through computer simulation examples and the experiment of distribute dynamic load identification show that the system is convenient,reliable and practical,and can be flexibly used in engineering practice application.