Key Laboratory of Traffic Safety and Control in Hebei

Shijiazhuang, China

Key Laboratory of Traffic Safety and Control in Hebei

Shijiazhuang, China
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Gu X.-H.,Shijiazhuang University | Gu X.-H.,Key Laboratory of Traffic Safety and Control in Hebei | Yang S.-P.,Shijiazhuang University | Yang S.-P.,Key Laboratory of Traffic Safety and Control in Hebei | And 4 more authors.
Zhendong Gongcheng Xuebao/Journal of Vibration Engineering | Year: 2017

The combined resonance of a Duffing oscillator with fractional-order derivative under a bi-harmonic external excitation is studied. The method of multiple scales is utilized to seek the approximately analytical solution, the amplitude-frequency curve and to study its stability conditions. Then, the system's singularity is analyzed completely, the transition sets and the bifurcation diagrams in various regions of the parameter plane are obtained. The numerical simulation is also conducted to analyze the effects of the parameters in the fractional system on the steady state responses. It is found that the fractional-order derivatives had both damping and stiffness effects, some of which are applicable to some vibration control problems. © 2017, Nanjing Univ. of Aeronautics an Astronautics. All right reserved.

Lu Y.,Shijiazhuang University | Zheng W.,Tianjin Metro Company | Chen E.,Key Laboratory of Traffic Safety and Control in Hebei | Zhang J.,Shijiazhuang University
Journal of Vibroengineering | Year: 2017

During driving of a vehicle on road, the tires are undertaking load conversion of the vehicle under various driving conditions and various road conditions within contact patches. As for the contact condition between tire and road, it is often deemed as composed by spring and damping element. The contact with road is always simplified as point contact. Besides, static friction model is adopted, which has ignored physical property of friction and dynamic process of establishment of friction force. It is far from sufficient for current vehicle and road safety design. In this paper, ADAMS software is applied to establish a multi-body dynamics model of heavy vehicle, actual vehicle data was adopted to check virtual sample vehicle, and the Strikbeck dynamical friction property is introduced to tire model during rolling contact between tire and payment, interface of Simulink with ADAMS is applied to put forward a complete vehicle dynamic model truly reflecting the process of dynamic contact between tire and road, and furthermore the correctness and availability of dynamic tire model are verified through comparison with classic Pac2002 tire model. As for dynamic behaviors of heavy vehicle in special sections, finite element method (FEM) is applied to put forward a new 3D complicated road model construction method to construct roads of different classes and long-downhill paths of different S-curves. Simulated analysis of the influence of different speeds, different classes of random roads, different slopes and different adhesion road models on ride comfort of vehicle driving was implemented through utilization of event editor and drive control file, and speed limit standards under different conditions are put forward, so as to provide theoretical basis for road alignment design and reasonable driving speed. Finally, the influence and changing rules of different speeds, different classes of random roads and different slopes on driving safety are discussed from the perspectives of each radial force of tire, alignment torque, sideslip angle and roll angle. © JVE INTERNATIONAL LTD.

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 | Year: 2014

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.

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 | Year: 2010

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.

Zhihong Z.,Shijiazhuang University | Zhihong Z.,Key Laboratory of Traffic Safety and Control in Hebei | Shaopu Y.,Key Laboratory of Traffic Safety and Control in Hebei
Computers and Electrical Engineering | Year: 2015

This study presents a new weak signal detection method based on the van der Pol-Duffing oscillator. The principle of the proposed method is described. A weak signal is detected through the transition from the chaotic to the periodic state. Numerical simulation shows that the van der Pol-Duffing oscillator is sensitive to a weak signal under strong noise conditions. Several aspects of the proposed method, including the noise influence, influence of different frequency signals, and influence of the phase shift, are studied in detail. Results indicate that the application of the van der Pol-Duffing oscillator to weak signal detection is feasible. © 2014 Elsevier Ltd. All rights reserved.

Yang G.,Shijiazhuang University | Yang G.,Key Laboratory of Traffic Safety and Control in Hebei | Liu H.,City College of New York | Lv P.,Shijiazhuang University | And 4 more authors.
Geotextiles and Geomembranes | Year: 2012

Lime-treated cohesive soils are used extensively as the construction materials of road embankments. In some cases, vertical embankment is needed, rendering the necessity to employ retaining walls backfilled with lime-treated cohesive soil. In China, geogrid-reinforced lime-treated cohesive soil retaining walls are increasingly used for this purpose. With the objective to reveal the behavior of this type of structure under working-stress condition and to shed light on its future application, a 6.0 m reinforced soil retaining wall was monitored for two years during and post construction. The results showed that the lime-treated soil carried the majority of the gravity load but the geogrid reinforcements also contributed to the integrity of the embankment. Under gravity loading, the backfill deformation was mainly elastic. Backfill compaction during construction was the critical factor influencing the reinforcement deformation and lateral earth pressure at the back of the facing, the latter of which decreased with time after the end of construction due to the increases of both backfill strength and facing displacement. Based on these results, it is inferred that under working stress condition, lime-treated backfill plays a major role in the stability of the retaining wall, while geogrid reinforcements play a secondary role. © 2012 Elsevier Ltd.

Wang P.,Shijiazhuang University | Wang P.,Key Laboratory of Traffic Safety and Control in Hebei | Ma H.X.,Shijiazhuang University
Advanced Materials Research | Year: 2013

Fault diagnosis of train bearing is an important method to ensure the security of railway. The key to the fault diagnosis is the method of vibration signal demodulation. The local mean decomposition (LMD) is a self-adapted signal processing method which has a good performance in nonlinear nonstationary signal demodulation. The improved LMD method based on kurtosis criterion can prevent errors in the process of calculating the product functions. With the verification of simulation and wheel set experiment, the improvement method has been certified usefully in practical application. © (2013) Trans Tech Publications, Switzerland.

Yongjie L.,Shijiazhuang University | Yongjie L.,Key Laboratory of Traffic Safety and Control in Hebei | Shaopu Y.,Shijiazhuang University | Shaopu Y.,Key Laboratory of Traffic Safety and Control in Hebei | Jianxi W.,Shijiazhuang University
Engineering Failure Analysis | Year: 2014

The top-down crack (TDC) has become the major cracking mechanism in thick pavement structure, especially for the perpetual pavement. The heavy-vehicle load condition plays a key role in the fracture characteristics of pavement cracks. A three-dimensional finite element (FE) model of the tire tread rubber-block and the pavement is established to describe the stress-strain field of the pavement with TDC. The three-directional friction condition and non-uniform distribution between tire and pavement are especially considered. Then the orthogonal Design of Experiment method is applied to discuss the effect law of fracture characteristics for the longitudinal crack affected by the multiple loading parameters simultaneously. Based on the statistics and data analysis of the diverse test results, it is found there is a nonlinear relationship between the equivalent stress intensity factor of the pavement and the load parameters.The longitudinal distance (from the load location to the center of the crack port) has a great influence on the equivalent stress intensity factor. The equivalent stress intensity factor of the crack port is more than double the crack tip buried in pavement, which extends in II/III composite type mostly. The simulation results can be used as reference for the further study on the fracture mechanism of pavement cracks and their control technique. © 2014 Elsevier Ltd.

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 | Year: 2013

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.

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 Company
Advanced Materials Research | Year: 2013

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.

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