The Research On Wheel Load Dynamic Detecting Of Weigh-In-Motion Systems

With the rapid increase of mileage and operation speed of highway and railway,the dynamic interaction between vehicle and structure has attracted wide attention.On the one hand,the forced vibration of the bridge caused by the dynamic impact of the running vehicle on the structure has a direct impact on the working condition and service life of the bridge structure,on the other hand,the vibration of the bridge structure in turn affects the safety and stability of the running vehicle.Especially in the strait crossing section or earthquake prone areas,the vehicle-bridge coupling dynamic system may be affected by earthquakes or hurricane,at this time,the coupled system would carry out multidimensional space motion under the external excitation,including three translations and three rotational components.To solve the shortcomings of analysis vehicle-bridge coupling dynamic problem in traditional inertial reference frame,this paper based on the non-inertial reference perspective,a three-dimensional spatial vehicle-bridge coupled dynamic interaction model under non-inertial reference frame is established.using Hamilton variational principle and vehicle dynamic equilibrium relationship,the nonlinear motion control differential equations of vehicle bridge coupled system are obtained,and the vehicle bridge coupled vibration response characteristics of straight beam and curved beam under external strong excitation are studied.Firstly,this paper introduced the important significance and value of the research on the vehicle bridge coupling vibration problems in nowadays,summarized the research achievements of the domestic and foreign scholars on vehicle bridge coupled vibration problems,and in view of the shortcomings of the traditional research methods in the analysis vehicle bridge coupling system with the large space motion,a new research viewpoint is put forward.Secondly,based on the existing research theory,a vehicle-bridge coupling dynamic model of a three-dimensional beams under the non-inertial reference frame is established.using Hamilton variational principle and vehicle dynamic equilibrium relationship,combining the contact state between the vehicle and the bridge in the process of movement,the general motion control equation of vehicle bridge coupling dynamic system the non-inertial reference system.Through example analysis,the relative rotation of bridge different supports,instantaneous detachment of vehicle and bridge deck,as well as vehicle bridge coupling dynamic response characteristics of spatial curved bridge which caused by external strong excitation are studied.And the influence of different parameters of vehicle and Bridge on the vibration response of the system also is discussed.at the end of the article,the research of this paper is summarized,and the research direction of the problem of vehicle bridge coupling vibration under the non-inertial reference system is put forward.