Based On Wireless Sensor, Consider Construction Stage Of The Large Span Bridge Modal Analysis

In this paper, the big span rigid frame bridge structure wireless detection technologyresearch, find a proper test methods to make wireless technology can be used to test the actualengineering; And based on wireless testing technology modal test, the modal signalprocessing method, then get the real bridge modal parameters. In these studies, and on thebasis of the mode of signal processing methods of MATLAB calculation analysis program,through to the expected large bridge suzhou-taicang-kunshan highway peace modal test andanalysis, the peace of the large bridge construction stage is revised model, main completed thefollowing work:1、Introduces the wireless sensor based on consideration of the large span bridgeconstruction stage modal analysis of the background and significance, this paper expounds thegeneral situation of the wireless sensor research and development trend, the large span bridgeand the vibration characteristics and based on the environment of incentive mode analysistheory knowledge.2、From the point of view of structure dynamics, introduces the single-degree-of-freedomsystem and more freedom system of the vibration equation, the transfer function andfrequency response function and related dynamic knowledge, then introduces the methods ofmodal signal processing steps, at last, the paper introduces the Fourier transform of the relatedcontent.3、 Detailed introduces the peak method and random subspace related theory knowledge,modal parameter identification method steps, and on the basis of the correspondingMATLAB.4、 Use of bridge structure finite element analysis software MIDAS/Civil, taiping supermajor bridge construction of the simulation analysis, it is concluded that the short ofcantilever, cantilever and long cantilever stage structure theory modal parameters, andthrough this paper of the peak method and random subspace MATLAB modal parameteridentification, get peace big bridge the actual kinetics characteristics. Through the comparisonwith the theoretical value, can show that environment incentive enough to identify thebridge are interested in mode, the results can be used as the bridge of the finite element modelof fixed foundation.5、In modal parameter identification based on the error analysis of the measured value,based on the structure parameters and the sensitivity of materials, to the finite elementsimulation model was revised, and achieve the expected effect of correction.