预制钢板组合梁桥结合了钢材和混凝土2种不同材料的特性,使其具有施工简便、受力明确等特点,从而得到了广泛的应用。文章以固镇至蚌埠高速公路工程项目处一30 m钢板组合梁桥为背景,针对钢板组合梁桥行车振动问题,设计了一种行车振动控...预制钢板组合梁桥结合了钢材和混凝土2种不同材料的特性,使其具有施工简便、受力明确等特点,从而得到了广泛的应用。文章以固镇至蚌埠高速公路工程项目处一30 m钢板组合梁桥为背景,针对钢板组合梁桥行车振动问题,设计了一种行车振动控制装置,利用ANSYS有限元软件分析了调谐质量阻尼器(tuned mass damper,TMD)在该桥减振控制中的参数敏感性,并对比分析了行车速度对减振效果的影响。研究结果表明,通过合理设置TMD的质量、刚度和阻尼系数可以达到最优的减振控制效果,该文提出的减振装置对移动车辆引起的竖向振动控制效果明显,且在较低时速下减振效果更加显著。展开更多
Running safety assessment and tracking irregularity parametric sensitivity analysis of high-speed maglev train-bridge system are of great concern,especially need perfect refinement models in which all properties can b...Running safety assessment and tracking irregularity parametric sensitivity analysis of high-speed maglev train-bridge system are of great concern,especially need perfect refinement models in which all properties can be well characterized based on various stochastic excitations.A three-dimensional refined spatial random vibration analysis model of high-speed maglev train-bridge coupled system is established in this paper,in which multi-source uncertainty excitation can be considered simultaneously,and the probability density evolution method(PDEM)is adopted to reveal the system-specific uncertainty dynamic characteristic.The motion equation of the maglev vehicle model is composed of multi-rigid bodies with a total 210-degrees of freedom for each vehicle,and a refined electromagnetic force-air gap model is used to account for the interaction and coupling effect between the moving train and track beam bridges,which are directly established by using finite element method.The model is proven to be applicable by comparing with Monte Carlo simulation.By applying the proposed stochastic framework to the high maglev line,the random dynamic responses of maglev vehicles running on the bridges are studied for running safety and stability assessment.Moreover,the effects of track irregularity wavelength range under different amplitude and running speeds on the coupled system are investigated.The results show that the augmentation of train speed will move backward the sensitive wavelength interval,and track irregularity amplitude influences the response remarkably in the sensitive interval.展开更多
A unified model which is used to study the launching and travelling dynamic properties of a rlcket/launcher system is established. In this model, the rocket, the launcher,and the launching vehicle are considered as a...A unified model which is used to study the launching and travelling dynamic properties of a rlcket/launcher system is established. In this model, the rocket, the launcher,and the launching vehicle are considered as an interacting dynamic system in order to study the dynamic interaction between the various parts of the system and the optimal parameter matching among the above mentioned parts. The following random factors are taken into account in this paper. road surface excitation. rocket mass center misalignment, thrust misalignment, dynamic of the rocket, and the cross wind. Based on this unified model, a computer simulation software is developed, some simulation work has been carried out, and certain beneficial results have been achieved.展开更多
文摘预制钢板组合梁桥结合了钢材和混凝土2种不同材料的特性,使其具有施工简便、受力明确等特点,从而得到了广泛的应用。文章以固镇至蚌埠高速公路工程项目处一30 m钢板组合梁桥为背景,针对钢板组合梁桥行车振动问题,设计了一种行车振动控制装置,利用ANSYS有限元软件分析了调谐质量阻尼器(tuned mass damper,TMD)在该桥减振控制中的参数敏感性,并对比分析了行车速度对减振效果的影响。研究结果表明,通过合理设置TMD的质量、刚度和阻尼系数可以达到最优的减振控制效果,该文提出的减振装置对移动车辆引起的竖向振动控制效果明显,且在较低时速下减振效果更加显著。
基金Project(2023YFB4302500)supported by the National Key R&D Program of ChinaProject(52078485)supported by the National Natural Science Foundation of ChinaProjects(2021-Major-16,2021-Special-08)supported by the Science and Technology Research and Development Program Project of China Railway Group Limited。
文摘Running safety assessment and tracking irregularity parametric sensitivity analysis of high-speed maglev train-bridge system are of great concern,especially need perfect refinement models in which all properties can be well characterized based on various stochastic excitations.A three-dimensional refined spatial random vibration analysis model of high-speed maglev train-bridge coupled system is established in this paper,in which multi-source uncertainty excitation can be considered simultaneously,and the probability density evolution method(PDEM)is adopted to reveal the system-specific uncertainty dynamic characteristic.The motion equation of the maglev vehicle model is composed of multi-rigid bodies with a total 210-degrees of freedom for each vehicle,and a refined electromagnetic force-air gap model is used to account for the interaction and coupling effect between the moving train and track beam bridges,which are directly established by using finite element method.The model is proven to be applicable by comparing with Monte Carlo simulation.By applying the proposed stochastic framework to the high maglev line,the random dynamic responses of maglev vehicles running on the bridges are studied for running safety and stability assessment.Moreover,the effects of track irregularity wavelength range under different amplitude and running speeds on the coupled system are investigated.The results show that the augmentation of train speed will move backward the sensitive wavelength interval,and track irregularity amplitude influences the response remarkably in the sensitive interval.
文摘A unified model which is used to study the launching and travelling dynamic properties of a rlcket/launcher system is established. In this model, the rocket, the launcher,and the launching vehicle are considered as an interacting dynamic system in order to study the dynamic interaction between the various parts of the system and the optimal parameter matching among the above mentioned parts. The following random factors are taken into account in this paper. road surface excitation. rocket mass center misalignment, thrust misalignment, dynamic of the rocket, and the cross wind. Based on this unified model, a computer simulation software is developed, some simulation work has been carried out, and certain beneficial results have been achieved.
