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用车轮加弹簧-阻尼器-簧上质量模拟移动小车,建立了车辆荷载作用下欧拉梁的动力分析模型,得到车桥系统运动控制方程。根据车辆的加速度响应的频谱分析,识别桥梁结构的基础频率。分析了桥梁阻尼比,车体弹簧刚度和阻尼,车桥质量比,车辆移动速度和加速度以及路面不平顺等参数对识别效果的影响,得出以下结论:桥梁阻尼比大小不影响识别精度;为提高识别的精度,车辆移动速度应较低,车桥质量比应较小;路面不平顺水平对识别的精度有非常显著的影响;车辆在桥上做加速度较小的变速移动时不会显著影响识别的精度。
The dynamic analysis model of the Eulerian beam under the vehicle load is established by using the wheel plus spring-damper-sprung mass simulation mobile trolley, and the motion control equation of the vehicle axle system is obtained. Based on the spectrum analysis of the vehicle’s acceleration response, the basic frequency of the bridge structure is identified. The influence of parameters such as bridge damping ratio, body stiffness and damping, body mass ratio, vehicle moving speed and acceleration, as well as pavement irregularity on the recognition effect are analyzed. The conclusions are drawn as follows: The damping ratio of bridge does not affect the recognition accuracy; Improve the accuracy of identification, the vehicle moving speed should be low, the axle mass ratio should be smaller; the unevenness of the road surface has a very significant impact on the accuracy of identification; the vehicle does not have a significant effect on the bridge when the acceleration is less variable speed moving Recognition accuracy.