Simulation And Study On Dynamics Stability Of Bridge Tower Detector

With the rapid development of transportation industry in our country. China’sbridge construction is growing by leaps and bounds. Owing to the rapid growth of thetraffic volume, the traffic capacity and bearing capacity of bridge is highly demanded.The aging of a large number of bridges constitute a huge pressure for the safe operationof the active bridge. As a result, it is necessary to develop advanced and effective testingequipment in order to strengthen the disease diagnosis and maintenance of the activebridge. This work has become an important research direction of traffic safety research.The bridge tower detector is a testing equipment, which was specially designed bysupervisor and his team based on the bridge tower structure of suspension bridge. Thedetector has a complex structure, whose testing precision and location accuracy aredirectly affected by the running stability of the detector. Based on virtual prototypetechnology, the dynamic performance of bridge tower detector was analyzed byco-simultion of ADAMS and Simulink.The main content include the following points:①Based on the structure and operation mechanism of the bridge tower detector,three-dimensional model of the detector is built and imported into ADAMS by UG withthe most reliable parasolid format.②On the basis of the modeling method of the cable, the model of the cablesystem was built with macro command of ADAMS successfully. Focuses on themodeling processes of the cable,including small cylindrical discrete, adding bushingforce, adding cable winding and contact force, together with detailed macro commands.③According to the tire characteristics of detector and equivalent road level ofbridge tower walls，the model of tires and road can be built by properties file of tire androad. Then motion, constrains and force should be added according to the movementrelation of physical prototype.④The working principle and mathematical mode of the three-phase asynchronousmotor is studied. Based on the three-phase asynchronous motor, the control model ofSimulink is established, and mechatronics co-simulation model is established bycombining mechanical system model of ADAMS. Dynamic simulation of detector wasimplemented successfully.⑤With reference to the stability evaluation method of vertical elevator, running stability of the bridge tower detector is evaluated. Firstly, the vibration characteristics ofthe detector was analyzed. Related parameters which influence its running stability areoptimized. Then the concept of postural stability was putted forward and analysed.Finally,influence of cable performance on system are analyzed. The results show thatrunning stability of the detector can reach the standard. The detector can operationstably.