多节超长大跨度高压大流量悬臂输送系统动力学耦合规律及安全评价预测

项目名称： 多节超长大跨度高压大流量悬臂输送系统动力学耦合规律及安全评价预测

项目编号： No.51275290

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 机械、仪表工业

项目作者： 李彦明

作者单位： 上海交通大学

项目金额： 80万元

中文摘要： 现代化大型工程的高效施工需求使百级超长臂架泵车成为今后发展重点，相对于传统泵车，动力学效应成为决定其作业质量和设备可靠性的不容忽视因素。多节柔性臂串联构成的大跨度柔性多体悬臂输送系统是超长混凝土泵车最为复杂和关键的部件，缺乏复杂动力学行为规律的揭示及其对作业行为和悬臂可靠性影响评价的理论和方法制约百米级超长臂架泵车设计开发及安全可靠运行。项目针对复杂结构及脉动变工况工作特性，研究大跨度悬臂输送系统在变姿态、多弯曲、多点弹性支撑等约束条件下的输送管流固耦合动力特性，建立超长柔性多体臂架的反向力学传递模型,揭示多点分布激励载荷对臂架关键部位微观性能衰退的影响规律。针对超长悬臂关键部位故障的高周损伤特性，构建关键部位基准微观性能的MSD模型，研究微观性能衰退的定量表征方法,建立工况模式历程与修正S-N曲线的映射关系, 实现性能预测与可靠性评估,为百米级超长悬臂泵车的安全可靠运行提供理论与方法。

中文关键词： 泵车臂架；流固耦合；机电耦合阻抗；缺陷检测；特征提取

英文摘要： Pump truck with overlenth arm longer than 100 meters will be given priority to be developed to satisfy the needs of some huge engineering . Dynamic actions become a key role on working quality and equipment safety due to the large size of the transfer arm.The lack of theories and methods to explain the dyanmic action and its effect on working process and safety has become bottleneck to the development and running safely of pump truck with overlenth arm longer than 100 meters. The dynamic characters of interaction between transfering pipe and concret of the cantilever transferring system with large Span will be studied according to the characters of structure and working modes under the constraints of varying angles,multi-surve and multi-spring support ac. A model will be put forward to exprees the the inverse dynamic tranfering law for the multi-body of the long arm. The degradation law of the safety performace at key section of the arm will be disgoveried under the ditributed excitation on much site at the same time. Monitoring and valuing of minute flaw are very important for large span cantilever arm due to it's damage are main caused mainly by high cycle fatigue.A Mass-Spring Damp(MSD)Model will be build to express the base of the safe performance on key section of the arm,and characterize methods for perfo

英文关键词： Arm of pump trauck；Fluid solid couple；Electro-Mechanical Impedance；Defect detection；Feature extraction