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Yongjie L.,Shijiazhuang University | Yongjie L.,Key Laboratory of Traffic Safety and Control in Hebei | Bowen Z.,Taiyuan Railway Transportation Equipment CO. | Jianxi W.,Shijiazhuang University
Open Mechanical Engineering Journal

The stiffness and damping characteristics under the turnout rail are important factors affecting vehicle safety and stable running. According to the variable cross-section structure of a single 60 kg/m turnout No.18, a multi-body dynamic model of the vehicle-turnout coupled system is established. Based on the orthogonal test method, 25 group working conditions have been designed with the combination of the sub-rail stiffness and damping parameters. It has been found that the stiffness parameters under the rail have a greater impact on the vehicle’s performance through the range analysis of the simulation results. The vertical sub-rail stiffness mainly influences the vehicle’s vertical response and Sperling indicator. The lateral stiffness effects the derailment coefficient and the riding comfort. The matching scheme of the sub-rail stiffness and damping parameters is deduced by aiming towards the optimal vehicle security, stability and comfort, which provides a reference for the sub-rail structure design. © 2014, Yongjie et al.; Licensee Bentham Open. Source

Yang G.-Q.,Shijiazhuang University | Yang G.-Q.,Key Laboratory of Traffic Safety and Control in Hebei | Du X.-L.,Shijiazhuang University | Zhou Q.-Y.,Shijiazhuang University | Zhang B.-J.,Shijiazhuang University
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering

Monitoring of a geogrid-reinforced lime treated soil retaining wall of Baoding-Cangzhou Highway in Hebei Province is carried out by use of field tests. The monitoring includes the vertical foundation pressure and lateral earth pressure of the reinforced soil wall facing and the tensile strain in the reinforcement. The vertical foundation pressure of reinforced soil retaining wall is non-linear along the reinforcement length, and the value is less than the theoretical one and will reduce with the decrease of time. The maximum value of the vertical foundation pressure is near the facing. The measured lateral earth pressure within the reinforced soil wall is non-linear along the height and the value is less than the active lateral earth pressure. The distribution of tensile strain in the geogrid reinforcements within the wall is a single peak value and the value is less than 0.6%. These monitoring results can be used as a reference for future study and design of geogrid-reinforced soil retaining wall systems. Source

Yang S.,Shijiazhuang University | Lu Y.,Key Laboratory of Traffic Safety and Control in Hebei | Li S.,Shijiazhuang University
International Journal of Dynamics and Control

As a basic theory of the vehicle industry, the vehicle dynamics plays an important role in the development of the vehicle industry. In the past decades, great progress was made in the theory and experiment of vehicle dynamics. This article summarizes recent advances in vehicle dynamics. In vehicle dynamics, the vehicle body (sprung mass), the suspension component (spring and damper) and tire (unsprung mass) are essential parts of the system. The modeling approaches and characteristics of the vehicle, tire and driver model with the respect to handling and driving dynamics are summarized in the paper. The important research issues about the vehicle-pavement coupled dynamics are discussed in detail. Several problems and directions for the further studying in vehicle dynamics are pointed out. © 2013, Springer-Verlag Berlin Heidelberg. Source

Lu Y.,Shijiazhuang University | Lu Y.,Key Laboratory of Traffic Safety and Control in Hebei | Li S.,Shijiazhuang University | Wang C.,Shijiazhuang University | Li S.,Jinchuan Group Co.
Advanced Materials Research

The leaf spring is a key component of heavy vehicle suspension. The stiffness characteristic has an important influence on vehicle ride comfort and road friendliness. Firstly, the structural features and working principle of leaf spring are introduced. Secondly the detail testing scheme of the leaf spring is proposed and the stiffness characteristics are tested through cascaded loading and unloading. The tested results show that the leaf spring has the typical features of non-linearity and hysteresis. In order to satisfy the vehicle dynamics simulation, the Fancher model is chosen to describe leaf spring nonlinear characteristics. Finally, the LSM (Least Squares Method) is utilized to identify five parameters of Fancher model based on experiment results. © (2013) Trans Tech Publications, Switzerland. Source

Chen E.-L.,Shijiazhuang University | Chen E.-L.,Key Laboratory of Traffic Safety and Control in Hebei | Liu Y.-Q.,Shijiazhuang University | Liu Y.-Q.,Key Laboratory of Traffic Safety and Control in Hebei | Zhao J.-B.,Shijiazhuang University
Zhendong yu Chongji/Journal of Vibration and Shock

In order to test the accuracy of the dynamic response of pavement, calculated based on the theoretical model, a new test rig was proposed. With the help of experimental and numerical simulation, the dynamic response of pavement under moving load was investigated. The vehicle-pavement test rig includes a vehicle model and a distributed stiffness pavement-roadbed model, and the vehicle model was simplified as a quarter of resonance source vehicle model. The dynamic response of distributed of stiffness pavement under moving resonance load and shock excitement were analysed respectively. The results show that the designed test rig is usable, and the experiment results can meet closely with the numerical results. Source

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