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Design and evaluation of cab seat suspension system based on negative stiffness structure

Journal of Southeast University(English Edition) 2021年第2期37卷 153-163页

作者： Liao Xin Zhang Ning Xing Haijun Zhang Wanjie School of Mechanical Engineering Shijiazhuang Tiedao University Shijiazhuang 050043 China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang 050043 China School of Mechanical Engineering Southeast University Nanjing 211189 China

To improve the vibration-isolation performance of cab seats,the optimization model of the seat suspension system of construction machinery cabs is proposed based on the negative stiffness *** negative stiffness nonlinear kinetic equation is established by designing the seat negative stiffness suspension structure(NSS).Using MATLAB,the different parameters of the suspension system and their influences on the dynamic stiffness are *** ideal configuration parameter range of the suspension system is ***,the optimization model of NSS is proposed,and the vibration transmissibility characteristics are simulated and analyzed by different *** results show that the displacement and acceleration amplitudes of the optimized seat suspension system are evidently reduced,and the four-time power vibration dose value and root mean square calculation values in the vertical vibration direction of the seat decrease by 86%and 87%,*** effective amplitude transmissibility(SEAT)and the vibration transmissibility ratio values also ***,the peak frequencies of the vibration transmitted to the driver deviate from the key frequency values,which easily cause human ***,the design of the seat suspension system has no effect on the health condition of the driver after being *** findings also illustrate that the NSS suspension system has good vibration-isolation performance,and the driver's ride comfort is improved.

关键词： construction machinery negative stiffness structure seat suspension system dynamic properties ride comfort

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A New Semi-active Control Strategy and Its Application in Railway Vehicles

A New Semi-active Control Strategy and Its Application in Ra...

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International Conference on Applied Nonlinear Dynamics, Vibration and Control, ICANDVC 2021

作者： Yiwei, Zhao Shaopu, Yang Yongqiang, Liu Yingying, Liao Pengfei, Liu State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang050043 China School of Transportation Shijiazhuang Tiedao University Shijiazhuang050043 China School of Mechanical Engineering Shijiazhuang Tiedao University Shijiazhuang050043 China School of Civil Engineering Shijiazhuang Tiedao University Shijiazhuang050043 China

ISBN: (纸本)9789811659119

With the continuous improvement of high-speed railway train operation speed, the problems of train operation safety and wheel rail wear are increasingly prominent. Improving train safety and reducing wheel rail wear can reduce operation and maintenance costs and bring greater economic benefits. In this context, a new semi-active control strategy applied in a Magnetorheological damper (MRD) is proposed to improve train safety and reduce wheel rail wear. Firstly, the transmission characteristics of the vehicle are analyzed according to the lateral vibration model of one quarter of two degrees of freedom. Then, the co-simulation model of Universal Mechanism (UM) and MATLAB is established, and the proposed control strategy is applied to the model to study its impact on the dynamic performance of the train. At the same time, the paper analyzes the influence of the control strategy on the dynamic performance of the train under different wearing levels. The results show that the control strategy can reduce the derailment coefficient of the train and the lateral force of the wheel axle, and improve the safety of the train greatly. At the same time, the wheel rail wear is reduced, the wheel wear degree is reduced, and the lathing cycle is prolonged. In addition, the control strategy can take into account the ride comfort of the train and maintain the good operation quality of the train. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： MATLAB

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A Novel Dynamic Data Driven Tire Model

Research Square

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Research Square 2021年

作者： Zhang, Junning Yang, Shaopu Lu, Yongjie Key Laboratory of Mechanical behavior System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang050043 China

In the study of vehicle dynamics, the accurate description of tire mechanical characteristics is the basis and key of vehicle dynamics simulation. An innovative tire model is proposed based on fuzzy algorithm and a sinusoidal membership function is used to design fuzzy rules. In order to ensure the accuracy of tire behavior calculation, this model is driven by a small amount of experimental data of tire mechanical characteristics. This tire model consists of four layers of fuzzy systems, each of which has a knowledge base. The data in knowledge base Ⅰ is obtained by experiments, and the data of knowledge base Ⅱ is computed by the upper system, and so is the later system. Then, the input signal, the change rate of side slip angle and slip rate, is considered to improve the calculation accuracy of the model. The proposed fuzzy tire model can accurately predict the longitudinal force, lateral force and self-aligning torque of the tire under unknown conditions. Finally, by comparing the fuzzy tire model with the experimental data, it is found that the maximum RRMSE (Relative Root Mean Square Error) value is not more than 0.14. It is proved that the model can accurately describe the tire mechanical characteristics under combined conditions. © 2021, CC BY.

关键词： Membership functions

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Experimental Study on Coupling Effects of Galloping of a Square Cylinder

Experimental Study on Coupling Effects of Galloping of a Squ...

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第八届国际振动工程会议

作者： Wenyong Ma Xiaobin Zhang School of Civil Engineering Shijiazhuang Tiedao University State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University

Static and elastically mounted square cylinders were tested in wind tunnel to illustrated the characteristics of galloping of a square cylinder. Aiming to reveal the coupling effect in galloping and validity of quasi-steady assumption in estimating the galloping response, aerodynamic forces in both still and vibrating cylinder are discussed. Meanwhile, the amplitudes and corresponding forces are also analyzed. The results show that the occurrence of galloping can be perfectly predicated by the static aerodynamic forces based on quasi-steady assumption. However, the aerodynamic force on vibrating cylinder illustrates significant difference because of the coupling effects. In another words, more complicated coupling effect need to be considered on estimating the aerodynamic force and galloping responses in terms of static aerodynamic forces and structural dynamics.

关键词： Experimental Study on Coupling Effects of Galloping of a Square Cylinder

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Mathematical model of a three-layer nano-beams based on the hypotheses of the Grigolyuk–Chulkov and the the nonlocal theory

Mathematical model of a three-layer nano-beams based on the ...

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第八届国际振动工程会议

作者： Yu-fei Hu Xue-Qian Fang Chang-Song Zhu State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Department of Engineering Mechanics Shijiazhuang Tiedao University

The mathematical model of three-layered beams developed based on the hypothesis of the Grigolyuk–Chulkov and the nonlocal theory and the size depended equations governing the layers motions on the nano-scales is constructed. The Hamilton’s principle yields the novel equations of motion as well as the boundary/initial conditions regarding beams displacement. The latter ones clearly exhibit the size dependent dynamics of the studied nano-beams,

关键词： Chulkov and the the nonlocal theory Mathematical model of a three-layer nano-beams based on the hypotheses of the Grigolyuk

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Effects of microstructural heterogeneity on fatigue properties of cast aluminum alloys

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Journal of Central South University 2020年第3期27卷 674-697页

作者： JIAO Yi-nan ZHANG Yi-fan MA Shi-qing SANG De-li ZHANG Yang ZHAO Jin-jin WU Sheng-chuan LIU Yong-qiang YANG Shao-pu School of Materials Science and Engineering Hebei Key Laboratory for Mechanics of Intelligent Materials and StructuresShijiazhuang Tiedao UniversityShijiazhuang 050043China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang 050043China School of Mechanical Engineering Shijiazhuang Tiedao UniversityShijiazhuang 050043China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengdu 610031China

Cast Al alloys are widely employed for engine components,structural parts,gear box,chassis,*** subjected to mechanical cyclic load during *** accurate fatigue life prediction of these alloys is essential for normal operation as fatigue cracks initiated during operation induce the lubrication oil leak and serious safety *** heterogeneity,including shrinkage/gaspores and secondary phase particles,is the most detrimental factor that affects fatigue life of cast Al *** approximate fatigue life cycles could be estimated based on the size distribution and locations of shrinkage pores/*** relationship between crack population and stress was reported by statistical distributions and the cumulative probability for cast Al alloys fail at a certain stress could be predicted by combination of Paris law and pore size *** depth was found to dominate the stress field around the pore on the surface and the maximum stress increases sharply when the pore intercepted with the surface at its *** microstructure of cast Al alloys usually is composed of primary Al dendrites,eutectic silicon,Fe-rich particles and other intermetallic particles are dependent upon alloy composition and heat *** coalescence of microcracks initiated from the fractured secondary phases was clearly found and can accelerate the initiation and propagation of the fatigue cracks.A link between defect features and the fatigue strength needs to be established through a good understanding of the fatigue damage mechanisms associated with the microstructural features under specific loading *** paper reviews the influences of shrinkage/gaspores and secondary phase particles,formed during casting process,on the fatigue life of Al-Si-Mg cast Al alloys.

关键词： cast aluminum alloys fatigue microstructural heterogeneous shrinkage/gas pore secondary phase particles

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Experimental study on swelling characteristics of mudstone in Baotaishan tunnel 4

Experimental study on swelling characteristics of mudstone i...

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4th International Symposium on traffic Transportation and Civil Architecture, ISTTCA 2021

作者： Ding, Xiang Zhu, Yongquan Guo, Xiaolong Yun, Kai China Railway Fifth Survey and Design Institute Group Co. Ltd. Beijing102600 China Shijiazhuang Tiedao University State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Hebei Shijiazhuang050043 China School of Civil Engineering Shijiazhuang Tiedao University Hebei Shijiazhuang050043 China

ISBN: (纸本)9781665425926

In order to clarify the basic physical characteristics and swelling characteristics of mudstone along Yinlan high speed railway, the basic physical characteristics test and swelling test of mudstone were carried out based on the mudstone of Baotaishan tunnel. The test results show that: (1) the mudstone of Baotaishan tunnel is mainly composed of quartz, calcite and illite, and the content of viscous minerals is low;(2) The swelling deformation of mudstone changes with time in three typical stages: rapid growth stage, deceleration growth stage and stable stage. The mudstone swellings rapidly after encountering water, and the swelling deformation at 1h reaches more than 85% of the total deformation;(3) The swelling deformation of mudstone in Baotaishan tunnel is small, but the swelling force is 250.8kPa. The swelling load is considered in the tunnel design. The test results can provide basic data for the design and construction of swelling mudstone tunnel along Yinlan high speed railway. © 2021 IEEE.

关键词： Deformation

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RESEARCH ON WHEEL WEAR SIMULATION AND WHEEL-RAIL CONTACT RELATIONSHIP OF HEAVY-HAUL FREIGHT WAGON

International Journal of Mechatronics and Applied Mechanics

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International Journal of Mechatronics and Applied Mechanics 2024年第18期2024卷 33-43页

作者： Kai, Hao Wenkai, Yang Donghui, Zhang Xinyan, Pei Chen, Wang Yuexiang, Xi School of Mechanical Enguneering Hebei University of Architecture Zhangjiakou075000 China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang050043 China

In order to study the evolution law of wheel profile wear of heavy-haul freight wagon and the influence of worn wheel profile on wheel-rail contact relationship, taking C80 heavy-haul freight wagon as the research object, the dynamic model of heavy-haul freight wagon and the prediction model of wheel wear were established by UM multi-body dynamics software. Based on vehicle-track coupling dynamics theory, Kik-Piotrowski wheel-rail contact algorithm and Archard wheel wear prediction model, wheel wear simulation research was carried out. Firstly, the correctness of the wheel wear method is verified by measuring the maximum wheel wear, and the wheel wear profile under different mileages is further predicted, and the wear under the wear profile and the variation law of wheel-rail contact parameters are analyzed. The results show that with the increase of running mileage, the wheel wear width increases, and the tread wear width of 1st wheelset is wider than that of 2nd wheelset, and it is close to the root of the wheel. At 70,000 km, the wear width of the 1st wheelset is [− 40 ~ 40 mm], while the 2nd wheelset is [− 40 ~ 36 mm], and the 1st wheelset has serious flange wear, and the flange wear rate of the 1st wheelset is 0.178 mm / 10,000 km higher than that of the 2nd wheelset, and is 2.39 times that of the 2nd wheelset. When the wheel runs up to 50,000 km, the wheel-rail contact point will jump. It is suggested that the wheel flange or rail side should be lubricated when the vehicle runs for 40,000 km in the early stage, and the wheel should be repaired when it runs for 50,000 km in the later stage. © 2024, Cefin Publishing House. All rights reserved.

关键词： Vehicle wheels

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Energy harvesting and speed sensing with a hybrid rotary generator for self-powered wireless monitoring

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Acta Mechanica Sinica 2024年第9期40卷 116-130页

作者： Zhixia Wang Hongyun Qiu Xuanbo Jiao Wei Wang Qichang Zhang Ruilan Tian Dongxing Cao School of Mechanical Engineering Tianjin UniversityTianjin 300350China Tianjin Key Laboratory of Nonlinear Dynamics and Control Tianjin 300350China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang 050043China Department of Mechanics Engineering Shijiazhuang Tiedao UniversityShijiazhuang 050043China Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing 100124China

Real-time onboard health monitoring systems are critical for the railway industry to maintain high service quality and operational ***,the issue with power supplies for monitoring sensors persists,especially for freight trains that lack onboard ***,we propose a hybrid piezoelectric-triboelectric rotary generator(HPT-RG)for energy harvesting and vehicle speed *** HPT-RG incorporates a rotational self-adaptive technique that softens the equivalent stiffness,enabling the piezoelectric non-resonant beam to surpass resonance limitations in a low-frequency *** experiments demonstrate the feasibility of using the HPT-RG as an energy harvesting module to collect the rotational energy of the freight rail transport and power the wireless temperature *** allow multiple monitoring in confined spaces on trains,a triboelectric sensing module is added to the HPT-RG to sense the operation speed and mileage of ***,the generator exhibits favorable mechanical durability under more than 600 h of official testing on the train bogie *** proposed HPT-RG is essential for creating a truly self-powered,maintenance-free,and zero-carbon onboard wireless monitoring system on freight railways.

关键词： Energy harvesting Speed sensing Rotational self-adaptive technique Low-frequency Self-powered wireless monitoring

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Parametric Influences of Stability and Settlement Pattern of Embankment on Slope Foundation 4

Parametric Influences of Stability and Settlement Pattern of...

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2020 4th International Conference on Water Conservancy, Hydropower and Building engineering, WCHBE 2020

作者： Zhang, Ouyang Yang, Guangqing Zhao, Yunfei Lu, Huali Hou, Licheng Third Construction Engineering Company Ltd. China Construction Second Engineering Bureau Ltd. Beijing100070 China School of Civil Engineering Shijiazhuang Tiedao University Shijiazhuang050043 China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang050043 China School of Traffic and Transportation Shijiazhuang Tiedao University Shijiazhuang050043 China China State Construction Engineering Corp. Ltd Beijing100020 China

Building a subgrade on the slope foundation is common for highway constructions in China. Under different hydrogeological conditions, the stability and differential settlement are the main problems for the construction of the subgrade. In order to study the parameters that influence the stability and deformation of subgrade, based on the cross-section of a mountainous region highway, those simulations were conducted to study the influence of subgrade height, subgrade width, embankment slope angle, and slope foundation angle on the stability and pattern of embankment. The results showed that the allowable filling height is 15 m;otherwise, there is a large risk of the slope sliding. Further, it was found that the maximum vertical deformation on the right shoulder of the embankment increases with an increase in the angles of the slope of the foundation. These results provide references for future highway constructions and design works in mountainous areas. © Published under licence by IOP Publishing Ltd.

关键词： Deformation

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