基于刚柔耦合的摊铺机熨平板横向振幅不均匀性研究

Study on the Non-uniformity of Lateral Vibration of Asphalt Paver Screed Based on Coupled Rigid and Flexible Model

摊铺机熨平板沿长度方向各点振幅不一致将影响路面的横向平整度。为了研究沥青混凝土摊铺机熨平板横向振幅的不均匀性,将熨平板作为柔性体,建立了摊铺机压实系统的刚柔耦合动力学模型;柔性体的动力学方程用有限元列式表示,推导刚柔耦合系统的动力学控制方程;通过Wilson-θ方法求解并进行数值仿真,研究了熨平板的振动加速度和振幅沿其长度方向的分布规律,以及振捣、振动频率对不均匀性的影响;对摊铺机样机进行了试验研究,论证了理论分析的结果。结果表明:将熨平板作为柔性体与其实际振动情况相符;可通过优化配置各段振捣梁质量、各段熨平板上振动器偏心轴的质量及偏心距,降低熨平板横向振动的不均匀性。

The non-uniformity of vibration amplitude the lateral roughness of pavement. In order to study in the length direction of paver screed has great influence on non-uniformity of lateral vibration of asphalt paver screed, the screed was thought as a flexible body, and a coupled concrete paver was established. The flexible body＇s rigid and flexible model for compacting mechanism of asphalt dynamic control equations were built using FEA formula and the dynamic equations of coupled rigid and flexible system were deduced. These equations were solved by the Wilson-O method, and numerical simulation was carried out to investigate the distribution of acceleration and amplitude along the length direction of screed, the influence of frequency of tamping and vibrating mechanism on non-uniformity. A paver prototype was tested to verify the theoretic analysis results above. The results showed that： the flexible model of screed accorded with the actual vibration properties of screed; the non-uniformity can be reduced by optimizing the allocation of tamper mass, eccentric shaft mass and eccentricity on every section of screed.