Journal articles on the topic 'Dynamic vehicle load'
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1
Cao, Yuan Wen, Yan Li Yi, and Min Qin. "Dynamic Analysis of Trebling-Pivot Vehicle on Undulate Pavement." Applied Mechanics and Materials 178-181 (May 2012): 1947–50. http://dx.doi.org/10.4028/www.scientific.net/amm.178-181.1947.
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Model of heavy truck was built with the ADAMS dynamics simulation software. Dynamic loads between the wheels and the pavement with different loads and different speeds and different road surfaces were analyzed comparatively. Results indicate that the dynamic load between the wheels and the pavement will be increased with the speed increase; the dynamic loads between the wheels and the pavement will be increased with the pavement amplitude increase; Under the same conditions, the dynamic load of fully loaded vehicle was larger than that of no-load vehicle.
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Zhao, Guiqing. "Research on Inspection Method of Dynamic Load of Truck by Using EWT." International Journal of Information Systems and Supply Chain Management 11, no. 1 (January 2018): 49–64. http://dx.doi.org/10.4018/ijisscm.2018010105.
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The article provides a new method for dynamic real-time detection of vehicle loads, and a useful technical reference for further improving the driving safety of the vehicle. The dynamic monitoring of vehicle load is of great significance to stable driving. In order to resolve this problem, we present an algorithm that can calculate vehicle load on the basic of empirical mode transform (EWT) and a corresponding vehicle load dynamic testing platform. The relationship between the vehicle load and the suspension variables is the foundation of realizing load detection. To obtain it, we establish a two-degree-of freedom suspension dynamic model and analyze the dynamic characteristics of the suspension under various vehicle speeds and loads. We design a dynamic load detection device with overload protection to collect the dynamic signal of vehicle. The data processing algorithm of the vehicle load dynamic detection device is constructed based on EWT. In order to verify the effectiveness of the device, a model truck is taken as the test vehicle. Based on the DSP chip, the vehicle load dynamic testing platform is developed. In order to test the accuracy of the system, the calculation accuracy of the system is tested with different load at different speeds. The experimental results show that the system exhibits a high accuracy in the measurement experiment.
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Guo, Guo He, Yu Feng Bai, and Tao Wang. "Analysis of Dynamic Load Level of High-Speed Heavy Vehicle Imposed on Uneven Pavement." Applied Mechanics and Materials 138-139 (November 2011): 146–52. http://dx.doi.org/10.4028/www.scientific.net/amm.138-139.146.
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Based on the significant destructive effect of heavy vehicle on uneven roads, two simplified models of pavement unevenness and vehicle dynamic load were established in accordance with D'A lembert principle, and Matlab software was used to analyze the changing law of dynamic load under the conditions of different road unevenness, vehicle speed and load. The results show that vehicles running on uneven road may produce more cumulative damages than static load, and DLC (dynamic load coefficient) changes in wide range, maximum up to 2.0 or more; the effect of speed and load on dynamic load is complex, and due to multi-factor interaction, DLC doesn’t consistently increase or decrease with speed and load increasing. Although the dynamic load level caused by high-speed heavy vehicle is not necessarily too high, its impact on the road can not be ignored.
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Hua, Xia, and Eric Gandee. "Vibration and dynamics analysis of electric vehicle drivetrains." Journal of Low Frequency Noise, Vibration and Active Control 40, no. 3 (February 27, 2021): 1241–51. http://dx.doi.org/10.1177/1461348420979204.
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The importance of the vibration and dynamics of electric vehicle drivetrains has increased because of noise and durability concerns. In this study, the important dynamic responses of drivetrains, including the dynamic mesh force acting at the gear teeth, dynamic loads acting at the bearings, and torsional fluctuation of the tire or load under major vibration excitations, such as motor torque fluctuation excitation and spiral bevel gear mesh excitation, were investigated. The results demonstrate that at a lower motor speed, dynamic responses such as the dynamic mesh force, dynamic bearing loads, and dynamic torsional displacement of the tire or load under motor torque fluctuation are dominant. At a higher motor speed, however, the dynamic responses under the gear mesh excitation are dominant. In addition, increasing the pinion-motor torsional compliance is an effective approach for suppressing the dynamic responses of drivetrains under motor torque fluctuation.
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Fan, Jian Lei, Jun Liu, Lei Zhang, and Hong Peng He. "Research on Load Modeling of Electric Vehicles." Applied Mechanics and Materials 291-294 (February 2013): 892–97. http://dx.doi.org/10.4028/www.scientific.net/amm.291-294.892.
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The accurate electric vehicle charging load model shall be established to analyze potential challenges of static and dynamic stability brought by electric vehicles. In this paper, experiments with the electric vehicle charger and battery were carried out to analyze the model characteristics. And then this model was compared to the composite load model. At last, the modeling approach of static and dynamic model of electric vehicles was proposed.
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Jun, Zhang, Jun Liu, Xiao Lu Ni, Wei Li, and Rong Mu. "Dynamic Model of a Discrete-Pontoon Floating Bridge Subjected by Moving Loads." Applied Mechanics and Materials 29-32 (August 2010): 732–37. http://dx.doi.org/10.4028/www.scientific.net/amm.29-32.732.
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A discrete-pontoon floating bridge is studied based on the beam model with assumption of the bridge deck as a elastic beam with uniform section, live load such as vehicle as moving concentrate forces, and pontoons as independent mass-spring-damping systems with singular degree of freedom. The comparison results of between vehicles and moving concentrated force show that a vehicle load can be simplified as one moving concentrated force. The present model can study not only a single moving load but also multiple moving loads.
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Melcer, Jozef. "Dynamic Load of Vehicle on Asphalt Pavement." Applied Mechanics and Materials 617 (August 2014): 29–33. http://dx.doi.org/10.4028/www.scientific.net/amm.617.29.
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Asphalt pavements are the transport structures subjected to dynamic effect of moving vehicles. Many effects influence the real values of vehicle tire forces. Road unevenness represents the most important factor influencing the magnitudes of tire forces. Such data can be obtained by numerical or experimental way. The paper deals with the numerical simulation of moving load effect on asphalt pavements and with numerical simulation of tire forces in relation to the road unevenness.
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Kim, Sang-Hyo, Kwang-Il Cho, Moon-Seock Choi, and Ji-Young Lim. "Development of a Generation Method of Artificial Vehicle Wheel Load to Analyze Dynamic Behavior of Bridges." Advances in Structural Engineering 12, no. 4 (August 2009): 479–501. http://dx.doi.org/10.1260/136943309789508474.
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In this study, artificial wheel loads are proposed which reflect the dynamic effects of running vehicles and road roughness to overcome shortcomings of vehicle modeling methods. To derive a suitable artificial load from the moving vehicle model, a parametric study is conducted regarding span lengths, types of bridges, road roughnesses, vehicle speeds and consecutive vehicles. After that, Power Spectral Density (PSD) analyses of wheel loads are performed using Maximum Entropy Method (MEM). Based on the result, a representative PSD function is proposed considering the cumulative energy distribution and the area of the PSD curve. The artificial wheel loads are generated based on this PSD function. Also, dynamic analyses of a bridge are performed using the artificial wheel loads. The probabilistic characteristics of dynamic responses are evaluated by comparing the results with the existing moving vehicle model. The results show that the dynamic responses through the proposed method are slightly overestimated. It is concluded that the proposed method is a simple and reliable procedure for engineers to perform a dynamic analysis in practical design.
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Popov, Pavel, Aleksandr Kuznetsov, Aleksandr Igolkin, and Kirill Afanasev. "THE LAUNCH VEHICLE VIBROACOUSTIC LOADS ASSESSMENT USING EXPERIMENTAL DATA AND FINITE ELEMENT MODELING." Akustika 34 (November 1, 2019): 132–35. http://dx.doi.org/10.36336/akustika201934132.
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The acoustic loads arising during the operation of the launch vehicle are sources of in-tense vibration of its components. Basically these loads are caused by such factors as the propulsion system operation during the launch vehicle start and by oscillatory processes in a turbulent boundary layer during the launch vehicle flight. In this regard, industry normative documentation prescribes evaluating dynamic tests of the launch vehicles and autonomous tests of rocket and space equipment.These tests confirm the dynamic strength and performance of launch vehicle components. This paper presents the results of the vibroacoustic loads analysis for the dry compartments of the mid-range launch vehicle currently being designed, depending on their construction, the attachments weight and the external load, which was set both in the form of acoustic load when solving a coherent elastic and acoustic task, and in the form of harmonic pressure, equivalent to acoustic.
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Jagiełowicz-Ryznar, C. "Dynamic Axle Load of an Automotive Vehicle When Driven on a Mobile Measurement Platform." International Journal of Applied Mechanics and Engineering 19, no. 3 (August 1, 2014): 585–97. http://dx.doi.org/10.2478/ijame-2014-0040.
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Abstract An analysis of the dynamic axle load of an automotive vehicle (AV) when it is driven on a mobile measurement platform is presented in this paper. During the ride, the time characteristic of the dynamic force N(t), acting on the axle, was recorded. The effect of the vehicle axle mass on the maximum dynamic force value and the dynamic coefficient were studied. On this basis it was attempted to calculate the total vehicle’s weight. Conclusions concerning the dynamic loads of the vehicle axles in relation to the reduced axle mass, were drawn. The optimal axle mass value, for which the dynamic coefficient reaches a minimum, was calculated
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Liu, Da Wei, Rong Chao Jiang, Yue Dong Yang, and Song Wang. "Simulation Study of Heavy Vehicle Road-Friendliness under Bilateral Tracks’ Excitation." Advanced Materials Research 680 (April 2013): 422–28. http://dx.doi.org/10.4028/www.scientific.net/amr.680.422.
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In order to study the road friendliness of heavy vehicle under bilateral tracks’ excitation, the spatial domain random pavement under bilateral tracks’ excitation was simulated through the second-order rational function power spectral density (PSD) and the harmonic superposition method. A rigid-flexible coupling virtual prototype of the heavy vehicle was established by using SIMPACK software. Then a driving dynamic model of heavy vehicle was established under bilateral tracks’ excitation. The tires loads of the vehicle’s each axle were calculated. The dynamic load coefficient (DLC) and 95 percentage fourth power aggregate force were used as the road-friendliness criterions for studying the road-friendliness of heavy vehicles under bilateral tracks’ road excitation. The research results could provide the basis for the prediction of road friendliness of heavy vehicle.
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Li, Yun Sheng, Li Li Shi, and Shuai Li. "Research on Impact Factor of Simple Composite Box Beam under Vehicle Loads." Advanced Materials Research 382 (November 2011): 471–76. http://dx.doi.org/10.4028/www.scientific.net/amr.382.471.
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Commonly the vibration due to vehicle loads has no apparently impact on highway bridges, but it is unneglectable when the heavy vehicles load on highway bridges. The impact factor is usually used to define the dynamic effect under vehicle loads in most design code. In this paper, the models of simple composite box beams with different span and the models of two simplified heavy vehicles are established respectively. The impact factors are calculated when the heavy loads pass though bridges at different speed under different load conditions. In addition, the change laws of the impact factors and the influence of different vehicle models on the impact factors are analyzed. Analysis results show that, not only the impact factor are increased with vehicle speed, but also the amplitude and period are all increased. In normal speed range, the influence of speed on the impact factors appears rising trend overall. For the bridge with same span, the impact factors under the double wheel load are smaller than that under single wheel load.
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Li, Shuo, Yan Zhao, Weiguo Lin, and Ming Su. "Design and Analysis of Road Load Detection Machine Based on Computer Technology." Journal of Physics: Conference Series 2143, no. 1 (December 1, 2021): 012003. http://dx.doi.org/10.1088/1742-6596/2143/1/012003.
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Abstract In this paper, an experimental device is designed for measuring vehicle dynamic load, the structure and stress of the equipment are analyzed by computer technology. The device design mainly includes vehicle, road surface, vehicle transmission, and control [1]. The vehicle is designed based on a 2-DOF vehicle model, the road is designed based on the Pasternak foundation model, and the control mainly uses a single-chip microcomputer. The dynamic response of vehicles to the road at different speeds is analyzed through the experiment [2].
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Ka’ka, Simon, Syukri Himran, Ilyas Renreng, and Onny Sutresman. "Aplikasi Aktuator Pneumatik sebagai Simulator Beban Dinamis Vertikal pada Mekanisme Suspensi Roda Kendaraan Seperempat." INTEK: Jurnal Penelitian 5, no. 2 (November 23, 2018): 104. http://dx.doi.org/10.31963/intek.v5i2.580.
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Driving comfort for riders and passengers is a keytarget to be achieved. Fluctuations in vehicle loads, bumps,perforated surfaces, and other road damage will greatly affectthe vehicle suspension working system. This study aims tocalculate the vertical dynamic load of the vehicle actually whichoccurs on road construction after through the vehicle wheelsuspension mechanism. The Pneumatic cylinder that was drivenby pressurized air directly weigh on the spring and ShockAbsorber that contained on the wheels of the vehicle. The loadfluctuations of the medium weight category vehicle aredetermined by the regulation of the amount of pressurized airentering into the pneumatic cylinder chamber pushing the pistonand connecting rods. The deviation that occurs duringcompression on the Spring and Shock Absorber, is substitutedinto the vehicle dynamic load equation by taking also themagnitude of the spring stiffness constant, and the fluid or gascoefficient of the damper. The results showed that the magnitudeof the displacement when the compression force worked hassignificantly influenced the amount of vertical dynamic load ofthe vehicle that overlies the road construction. Experimentalresults using pneumatic actuators instead of real dynamic vehicleloads illustrate the characteristics of the relationship betweenwork pressure and dynamic load. If the working pressure of P2(bar) is given great, the vertical dynamic load Ft (N) whichoverloads the structure of the road is also greater. From thegraph shows that shock absorbers have greater ability to reducedynamic load vertically when compared to spring ability.
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Zhu, Shengyang, Jun Luo, Mingze Wang, and Chengbiao Cai. "Mechanical characteristic variation of ballastless track in high-speed railway: effect of train–track interaction and environment loads." Railway Engineering Science 28, no. 4 (November 30, 2020): 408–23. http://dx.doi.org/10.1007/s40534-020-00227-6.
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AbstractDue to the fact that ballastless tracks in high-speed railways are not only subjected to repeated train–track dynamic interaction loads, but also suffer from complex environmental loads, the fundamental understanding of mechanical performance of ballastless tracks under sophisticated service conditions is an increasingly demanding and challenging issue in high-speed railway networks. This work aims to reveal the effect of train–track interaction and environment loads on the mechanical characteristic variation of ballastless tracks in high-speed railways, particularly focusing on the typical interface damage evolution between track layers. To this end, a finite element model of a double-block ballastless track involving the cohesive zone model for the track interface is first established to analyze the mechanical properties of the track interface under the loading–unloading processes of the negative temperature gradient load (TGL) followed by the same cycle of the positive TGL. Subsequently, the effect of wheel–rail longitudinal interactions on the nonlinear dynamic characteristics of the track interface is investigated by using a vehicle-slab track vertical-longitudinal coupled dynamics model. Finally, the influence of dynamic water pressure induced by vehicle dynamic load on the mechanical characteristics and damage evolution of the track interface is elucidated using a fluid–solid coupling method. Results show that the loading history of the positive and negative TGLs has a great impact on the nonlinear development and distribution of the track interface stress and damage; the interface damage could be induced by the wheel–rail longitudinal vibrations at a high vehicle running speed owing to the dynamic amplification effect caused by short wave irregularities; the vehicle dynamic load could produce considerable water pressure that presents nonlinear spatial–temporal characteristics at the track interface, which would lead to the interface failure under a certain condition due to the coupled dynamic effect of vehicle load and water pressure.
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Wu, Tianyu, Wenliang Qiu, Hao Wu, Guowen Yao, and Zengwei Guo. "Coupled Vibration Analysis of Ice–Wind–Vehicle–Bridge Interaction System." Journal of Marine Science and Engineering 11, no. 3 (March 1, 2023): 535. http://dx.doi.org/10.3390/jmse11030535.
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Bridges built in ice-covered water regions are mostly in complex marine environments, they not only need to withstand strong wind but also resist the impact of drift ice. However, at present, there is a lack of vehicle–bridge coupling vibration analysis and driving safety assessment under combined ice and wind. Therefore, this study constructs a complete analysis framework of ice–wind–vehicle–bridge interaction to investigate the dynamic responses of the coupled system. Ice load is simulated by a linearized ice–structure interaction model, which is based on the self-excited vibration theory. Wind load on the bridge deck includes steady-state force and buffeting force. Wind load on the vehicle is simulated based on the quasi-steady model. Subsequently, ice load, wind load, soil–structure interaction (SSI), and additional water mass are all integrated into a full bridge model based on a sea-crossing bridge with running vehicles in the Bohai Sea. The results indicate that ice load has a greater impact on the lateral dynamic response of the bridge, the combined action of ice and wind has no superimposed effect on the movement of the bridge but has a restraining effect. Wind load presents a more significant influence on the lateral dynamic response of the vehicle, the coupled dynamic responses of the vehicle cannot be combined by the superposition under separate ice and wind. The combined effect of ice and wind obviously increases the sideslip risk of running vehicles and reduces driving safety.
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Syarif, Iif Ahmad, and Abdul Muis Prasetia. "Aplikasi Weigh in Motion Menggunakan Metode Estimasi Untuk Mengukur Beban dan Kecepatan Kendaraan Bergerak." Borneo Engineering : Jurnal Teknik Sipil 3, no. 1 (August 17, 2019): 14. http://dx.doi.org/10.35334/be.v3i1.701.
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Humans as users of transportation modes, of course, want the ability of vehicles that are able to carry as much cargo as possible and on the fastest trip. This condition often results in the vehicle carrying the maximum load even exceeding the carrying capacity. On this basis and to maximize the results of data collection in the form of traffic volumes and vehicle loads, it is necessary to attempt to check the load of vehicles or trucks passing through the road without causing queues and congestion. To that can be done using a dynamic weighbridge which utilize methods of Weigh In Motion (WIM). The WIM system is equipped with the ability to measure vehicle loads when the truck runs at a certain speed through sensors placed below the road surface. The results showed that the WIM prototype can measure the speed and weight of the vehicle running successfully, the measurement results of running vehicle loads have an average error of 14.9%.
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Cui, Yaning, Chundi Si, Song Li, and Taotao Fan. "Comparative Study of the Mesomechanical Response of Asphalt Bridge Deck Pavement under Multiple Loads." Coatings 12, no. 11 (November 2, 2022): 1665. http://dx.doi.org/10.3390/coatings12111665.
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Asphalt bridge deck pavement is a weak bridge structure area, and early damage usually occurs in this area under vehicle loads. Due to the complexity and diversity of vehicle loads and material structures, it is difficult to truly reflect the mechanical response of bridge deck pavement under vehicle loads. This paper studies the vehicle road interaction from a microscopic perspective. In this research, the dynamic response of asphalt bridge deck pavement under multiple loads is comparatively studied, considering the mesoscopic structure of the asphalt materials. First, the compressive properties, tensile properties and interlaminar shear properties of each layer were studied through laboratory tests. Second, the asphalt mixture bridge deck pavement model, including mesostructured, was established. Then, the subprograms of the sinusoidal vibration load, rolling load and vehicle road coupling load were realised using the discrete element method (DEM). Finally, the mesomechanical response of asphalt bridge deck pavement under those three dynamic loads was comparatively studied. The study finds that there is a large difference in the mechanical response of bridge deck pavement under multiple loads. A sinusoidal vibration load can simply be the moving load, the edge of the loading area and the bottom of the lower layer bear large tensile stress, and the shear stress at the edge of the loading area is approximately 4 times that of the middle area. The rolling load can better reflect the status of the vehicle. There is a certain difference in the shear stress response between the rolling load and the sinusoidal vibration load, and the lower layer bears compressive–tensile alternating stress. Under the vehicle road coupling load, the volatility of the dynamic response is obvious due to the road roughness. Therefore, it is of vital importance to improve the abrasion resistance of the surface layer. The results show that the comprehensive consideration of multiple loads and the mesostructure can provide a more reliable method for the dynamic design of bridge deck pavement, which is of great significance for improving the durability of the pavement.
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Tian, Rui Lan, Xin Wei Yang, and Li Fang Ren. "Study on Mid-Span Deflection of Beam Bridge under Moving Loads by the Recently Proposed Oscillator with Time-Dependent Stiffness." Advanced Materials Research 179-180 (January 2011): 1096–101. http://dx.doi.org/10.4028/www.scientific.net/amr.179-180.1096.
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The smooth-and-discontinue(SD) oscillator with time-dependent stiffness was put forward and founded to study dynamic characteristics of beam bridge under moving load. Mid-span deflection of beam bridge under moving load was described as vibration trace. Proper stiffness model function was elected and study nonlinear dynamic behaviors of mid-span deflection when several vehicles pass through bridge successively. The software MATLAB was used to simulate the model and obtain the bifurcation diagrams with parameter of vehicle speed and Poincare sections of the vehicle-bridge coupled system. The result shows the complicated nonlinear dynamics with periodic motion, quasi-periodic motion phenomena and chaos, the occurrence alternatively among these motions.
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Gołowicz, Artur, Antoni Kidawski, Mateusz Kowalczyk, Jakub Ogłaza, and Andrzej Włodarczyk. "Securing loads on road vehicles, national regulations and test method in accordance with PN-EN 12642." Transport Samochodowy 65, no. 1 (May 31, 2022): 36–40. http://dx.doi.org/10.5604/01.3001.0015.8715.
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The objective of this work is to develop a method of safe vehicle testing for compliance with the PN-EN 12642 standard. Vehicle tests can be carried out in a static and dynamic form. Dynamic tests better reflect the forces exerted by loads on the walls of the cargo space of vehicles. Heavy goods vehicles with certified walls of the cargo space ensure the safe transport of cargo in road traffic. Improper load securing is the cause of approximately 25% of truck accidents. Reducing the number of road accidents is the responsibility of each EU Member State. In Poland, the requirements for securing loads and appropriate vehicle construction have been introduced in the national regulations regarding the technical conditions of vehicles and their necessary equipment. The article presents the current legal status regarding cargo securing, as well as the designed and implemented solution and the method of safe conducting dynamic tests of vehicles in accordance with the PN-EN 12642 standard
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Bondrea, Ioan, and Lucian Eugen Rosca. "Statisticaly Analysis For In-Depth Understanding Of The Vehicle Lifetime Load Cycle." Balkan Region Conference on Engineering and Business Education 1, no. 1 (August 15, 2014): 63–66. http://dx.doi.org/10.2478/cplbu-2014-0014.
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AbstractThe automotive industry faces future important changes through adoption of several new complex technologies like” X-by-wire” systems for vehicle dynamic control and high focus on green technology, fuel efficiency hybrids and electric vehicles. The implications of these technologies require in-depth understanding of the vehicle behavior during lifetime cycle, in order to reach a maximum optimized design. Therefore this paper introduces an analysis of a long-term capture data collection from a fleet of serial production vehicles in normal everyday use, as a solution to the lack of information available to describe the vehicle dynamics and load over the systems in a sufficient way. The analysis brings knowledge-based information, where before was difficult to answer and where statements were mainly based on subjective explanation. Results reveals important information describing load cycles during vehicle lifetime for different control events with focus on the braking events.
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Ridley, Peter, and Peter Corke. "Load Haul Dump Vehicle Kinematics and Control." Journal of Dynamic Systems, Measurement, and Control 125, no. 1 (March 1, 2003): 54–59. http://dx.doi.org/10.1115/1.1541671.
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This paper examines the kinematics and control of a Load Haul Dump Vehicle used in underground mining operations. The aim of the work is to develop an autonomous guidance strategy. A linear, state-space, mathematical model of the vehicle is derived purely from geometric consideration of the vehicle and its desired path. Autonomous regulation of the vehicle is shown to be theoretically feasible using state variable feedback of displacement, heading, and curvature error. A relationship between stability and vehicle speed is derived. This expression forms the basis of an adaptive tuning strategy, which optimizes the vehicle’s dynamic response.
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Saleh, Mofreh F., Michael S. Mamlouk, and Emmanuel B. Owusu-Antwi. "Mechanistic Roughness Model Based on Vehicle-Pavement Interaction." Transportation Research Record: Journal of the Transportation Research Board 1699, no. 1 (January 2000): 114–20. http://dx.doi.org/10.3141/1699-16.
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A mechanistic roughness performance model that takes into account vehicle dynamics was developed for use in flexible pavement design and evaluation. The model was developed in the form of a relation between roughness and number of load repetitions, axle load, and asphalt layer thickness. The model is completely mechanistic and uses vehicle dynamics analysis to estimate the dynamic force profile and finite element structural analysis to estimate the change of pavement surface roughness for each load repetition. The model makes use of the fact that pavement roughness changes the magnitude of the vehicle dynamic forces applied on the pavement and that the dynamic forces change the road roughness. The developed mechanistic roughness performance model can be used to estimate the 80-kN (18-kip) equivalent single-axle load for mixed traffic. The model can also be used to design pavement so that it will last for a certain number of load repetitions before reaching a predetermined roughness level. Performance-based specifications can be developed using the methodology presented in this study. The model has been calibrated and verified with field data elsewhere.
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Li, Fangyuan, Zhenwei Guo, Yunxuan Cui, and Peifeng Wu. "Dynamic Load Test and Contact Force Analysis of the AERORail Structure." Applied Sciences 13, no. 3 (February 3, 2023): 2011. http://dx.doi.org/10.3390/app13032011.
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The flexible structure of the new type of aerial track studied in this paper is formed by strings and tracks, which have obvious dynamic characteristics under the action of vehicle moving loads and is also an important factor affecting its performance. The paper uses the full-scale model of AERORail, based on the modal test under a specific span, combined with the fundamental frequency analysis of the structure, and carries out the dynamic load test to determine the change law of the contact force acting on the rail by the dynamic load. The time-domain improved algorithm based on the method of moments is used to identify and analyze the dynamic loads under different spans and vehicle speeds and to determine the correlation between the dispatched loads and the spans and vehicle speeds. It is proven that the occurrence time and frequency of the contact force are related to the passing time of the vehicle. The contact force fluctuates with the change in the vehicle speed, but with the increase in the span, the fluctuation of the contact force decreases obviously. The relevant conclusions provide support for the layout of the AERORail vehicle load. For this innovative structure, the relevant conclusions provide the basis for the application of this novel structure.
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Huang, Bingsheng, Fusheng Zhang, and Linlong Lei. "Dynamic Path Planning Based on Service Level of Road Network." Electronics 11, no. 20 (October 11, 2022): 3267. http://dx.doi.org/10.3390/electronics11203267.
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Vehicle–road coordination is an important application scenario in the sustainable development of urban transportation. In this scenario, by navigating the vehicles in the road network, the vehicles can run more smoothly in the city, reduce unnecessary detours and parking, and realize energy savings and emission reductions. Although vehicle–road coordination in a large area has not been fully realized, people’s travel is increasingly dependent on navigation. If the trips of most vehicles follow the same navigation suggestion in a short period of time, some sections in the given route of the navigation will bear excessive traffic load. In order to solve this potential problem, this paper relies on the vehicle–road collaboration scenario and combines the service level of the road network factors between vehicles to plan the travel path of the vehicle. This keeps the traffic load of each road section in the path at a reasonable level. Within the scope, considering the overall utilization of road resources and the efficiency of road network traffic, we established the road network evaluation index through the simulation comparison with the Dijkstra algorithm. Under the path planning method proposed in this paper, the total travel time of the vehicle is reduced by 23.4%, and the road network operation efficiency is improved by 6.6%, which proves that the method can be used. This method can effectively alleviate the load of the road network, improve operation efficiency, and finally achieve the purpose of energy saving and emission reduction.
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Zhan, Tao, Yuan Yao, Jinping Li, Xiang Liu, and Yulin Feng. "Influence of Fastener Failure on Dynamic Performance of Subway Vehicle." Applied Sciences 12, no. 13 (July 4, 2022): 6769. http://dx.doi.org/10.3390/app12136769.
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The track fasteners may be damaged by fatigue and impact load during long-term subway operation, resulting in the failure of the connecting components between the rail and the track plate, and the spacing of rail support becomes larger, resulting in an increase in its dynamic deformation, affecting the subway vehicle’s running performance, and, in severe cases, endangering the vehicle’s running safety. A vehicle-subway track system model was created to study the running performance of subway vehicles when fasteners failed. A multi-rigid, body spring damping system is used to describe the vehicle system. The model for the track system is created using the finite element method (FEM), and the vehicle dynamic performances under various fastener failure scenarios are calculated, as well as the vehicle’s running comfort and safety in various scenarios. The findings show that fastener failure has little impact on the vehicle’s running comfort but it has a significant impact on the vehicle’s wheel unloading ratio.
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Goodrum, WJ, and D. Cebon. "Synthesising spatially repeatable tyre forces from axle load probability distributions." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 230, no. 5 (March 13, 2015): 699–714. http://dx.doi.org/10.1177/0954406215575581.
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Spatially repeatable dynamic tyre forces arise because heavy trucks are similar in weights, dimensions and dynamic characteristics and they travel at similar speeds. It is important to be able to model the statistical and spatial characteristics of dynamic tyre forces, using efficient algorithms, when studying the effects of vehicle–road interaction. Pitch-plane vehicle models derived from ‘per-vehicle’ weigh-in-motion (WIM) data of US ‘Class 9’ vehicles were used to generate a Virtual WIM vehicle fleet for spatial repeatability calculations. Four methods were investigated for simulating dynamic tyre forces with a level of spatial repeatability similar to the Virtual WIM fleet: (i) randomised pitch-plane models, (ii) randomised quarter car models (both derived from axle load probability distributions), (iii) phase-shifted quarter car models and (iv) phase-shifted pitch-plane models. Of these four methods, the best was found to be the phase-shifted pitch-plane models, which required four orders of magnitude less computation time than the Virtual WIM case, while approximating the spatial repeatability of the Virtual WIM fleet with reasonable accuracy.
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Zhang, Li Ping, and Li Xin Guo. "The Vehicle Dynamic Load Indentification under the Excitation of Random Road Surface." Advanced Materials Research 299-300 (July 2011): 255–59. http://dx.doi.org/10.4028/www.scientific.net/amr.299-300.255.
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In this paper, inverse pseudo excitation method for vehicle dynamic load identification is used. When the vehicle is in stationary random vibration, the vehicle dynamic load spectrum recognition problem is solved by using the deterministic method. The auto-PSD and cross-PSD of vehicle vibration response is known. Base on the reversing the power spectrum of road excitation, Vehicle dynamic load PSD is obtained. The results show that, Inverse pseudo excitation method for solving the vehicle dynamic load spectrum has good solution accuracy, put forward new ideas and methods for vehicle engineering practice, and has broad application prospects.
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Lin, Miao, Changbin Hu, Said M. Easa, and Zhenliang Jiang. "A New Approach to Predict Dynamic Loads Considering Highway Alignment Using Data Mining Techniques." Applied Sciences 12, no. 11 (June 4, 2022): 5719. http://dx.doi.org/10.3390/app12115719.
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Premature damage to heavy-duty pavement has been found to be significantly caused by the vehicle–highway alignment interaction, especially in mountainous regions. This phenomenon was further verified by field pavement damage investigations and field tests. In order to elucidate the potential mechanism of this interaction, it is important to address the vehicle dynamic loads generated by the interaction between vehicle and pavement. Based on this, the paper realizes a new method of vehicle dynamic load prediction using data mining techniques, namely artificial neural network (ANN) and support vector machine (SVM)). The data, including dynamic loads and highway geometric characteristics, were collected by a wheel force transducer (WFT) and global positioning system (GPS), respectively. The coefficient of determination (R2) and root mean square error (RMSE) were used to evaluate the performance of the prediction models. The results showed that the proposed dynamic load prediction model established by ANN was better than that by SVM. Moreover, the model implied that dynamic loads were highly correlated with curvature and longitudinal grade, and furthermore, curvature was found to have a larger effect. The proposed dynamic load prediction technique provides a feasible and rapid approach to identify pavement damage under complex vehicle–highway alignment interactions.
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Lin, Yu Sen, Li Hua Xin, and Min Xiang. "Parameters Analysis of Train Running Performance on High-Speed Bridge during Earthquake." Advanced Materials Research 163-167 (December 2010): 4457–63. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.4457.
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A model of coupled vehicle-bridge system excited by earthquake and irregular track is established for studying train running performance on high-speed bridge during earthquake, by the methods of bridge structure dynamics and vehicle dynamics. The results indicate that under Qian’an earthquake waves vehicle dynamical responses hardly vary with the increasing-height pier, but vehicle dynamical responses increase evidently while the height of pier is 18m, which the natural vibration frequency is approaching to dominant frequency of earthquake waves. Dynamic responses are linearly increasing with earthquake wave strength. Dynamic response of vehicles including lateral car body accelerations and every safety evaluation index all increase with train speed, so the influences of train speed must be taken into account in evaluating running safety of vehicles on bridge during earthquakes, but lateral displacement of bridge is varying irregularly. Dynamic responses and lateral displacement of bridge reduce under the higher dominant frequency of earthquake wave. Derailment coefficient, later wheel-rail force and lateral vehicle acceleration become small with increasing damping ratio. Vertical vehicle acceleration and reduction rate of wheel load are hardly varying with damping ratio.
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GODZHAEV, Z. A., V. V. SHEKHOVTSOV, M. V. LIASHENKO, A. I. ISKALIEV, and S. J. E. ENRIQUEZ. "REDUCING OF DYNAMICAL LOAD IN VEHICLE TRANSMISSION BY THE PART WITH CONTROLLED ELASTIC–DAMPING CHARACTERISTICS." Fundamental and Applied Problems of Engineering and Technology, no. 5 (2021): 157–64. http://dx.doi.org/10.33979/2073-7408-2021-349-5-157-164.
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This paper describes the technical solution of the elastic coupling proposed by authors. This coupling is designed to reduce dynamic load in a vehicle transmission into wide amplitudes range and specter of variable loads. The coupling uses the serpentine spring with progressive nonlinear elastic characteristic as the elastic element. The elastic characteristic provides reducing of dynamic load in transmission of a vehicle at loading regimes with high dynamic factor. Acting load at transmission parts sufficiently exceeds a nominal calculated load at these regimes. Besides progressive nonlinear characteristic the coupling has damping features which also increase nonlinearly at increasing of variable loads amplitudes in the transmission part where the coupling is installed. Increasing of amplitudes of variable loads leads to automatic increasing of number of used friction pairs in the coupling and total friction area. Thus the coupling structure provides the automatic control of its elastic–damping characteristics which adaptively changes in accordance with load regimes. This feature provides maximal reducing of transmission dynamic load.
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PODDUBKO, Sergey N., Nikolay N. ISHIN, Arkadiy M. GOMAN, Andrey S. SKOROKHODOV, and Vladimir V. SHPORTKO. "METHODS FOR CALCULATING THE LOAD OF ELECTRIC VEHICLE GEARBOXES USING THEIR DYNAMIC MODELS." Mechanics of Machines, Mechanisms and Materials 2, no. 59 (June 2022): 16–23. http://dx.doi.org/10.46864/1995-0470-2022-2-59-16-23.
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A two-mass dynamic model of an electric vehicle is considered to obtain analytical dependences describing the gearshift process in a shaft-planetary gearbox. The calculations are based on the optimal diagram of shifting gears from low to high without interruption of the power flow from the electric motor. At the stage of gear shifting, at which the kinematic gear ratio of the gearbox changes from u1 to u2, Lagrange equations of the second kind are used to determine the time dependences of angular velocities of the input and output shafts of gearbox. An example is given for calculating the gearshift time from low gear to high one for the MAZ-4381EE delivery electric truck, as well as a refined calculation for a multi-mass dynamic scheme is carried out.
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Lu, Yongjie, Yinfeng Han, Weihong Huang, and Yang Wang. "Sliding mode control for overturning prevention and hardware-in-loop experiment of heavy-duty vehicles based on dynamical load transfer ratio prediction." Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 236, no. 1 (December 22, 2021): 68–83. http://dx.doi.org/10.1177/14644193211057972.
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Aiming at the rollover risk of heavy-duty vehicles, an adaptive rollover prediction and control algorithm based on identification of multiple road adhesion coefficients is proposed, and the control effect has been verified by hardware-in-the-loop experiments. Based on the establishment of a 3 DOFs (Degree of freedom) vehicle dynamic model, the roll angle of the vehicle dynamic model is estimated in real time by using Kalman filter algorithm. In order to ensure the real-time operation of anti-rollover control strategy for multi-body dynamic heavy vehicle model, a sliding mode variable structure controller for anti-rollover of vehicles is designed to determine the optimal yaw moment. Specially, the recognition algorithm of road surface type is integrated into the control rollover algorithm. When the control system with road recognition algorithm recognizes whether the vehicle is in danger of rollover, it can not only adjust the state of the vehicle, but also shorten the time to reach the stable area of the vehicle's lateral load transfer rate by about 2 s. In order to further improve its adaptability and control accuracy, a Hardware-in-loop test platform for three-axis heavy-duty vehicles is built to verify the proposed anti-rollover control strategy. The results prove that the proposed control strategy can accurately predict the rollover risk and control the rollover in time.
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Podrigalo, Mikhail, Dmytro Abramov, Yurii Tarasov, Mykhailo Kholodov, Ruslan Kaydalov, Nadiya Podrigalo, and Vitaly Shein. "Improvement evaluation methodology of vehicle load and energy efficiency." Automobile transport, no. 49 (December 24, 2021): 36–44. http://dx.doi.org/10.30977/at.2019-8342.2021.49.0.09.
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Problem. There was a need to expand the well-known concept of vehicle operational properties – fuel efficiency arose in connection with the advent of new alternative power plants (electric motors, flywheel engines, hybrid power plants, etc.), which requires the inclusion of not only the thermal energy of the fuel, but also other types of energy (electrical and mechanical). In the paper the research of choice and justification of the vehicle energy efficiency indicators by assessing the energy costs of the engine for its movement was made. The analysis of the relationship between energy characteristics of dynamics and vehicle efficiency was made. Goal. The aim of the study is to analyze methods for assessing the vehicle energy efficiency. To achieve this goal, it is necessary to determine indicators that will allow a comparative analysis of energy efficiency indicators of various vehicles. Methodology. The approaches taken in the work to solve this goal are based on substantiating the indicators of the energy efficiency of the car by assessing the energy consumption of the engine for its movement. Results. In our opinion, in projecting and evaluating the dynamic properties of vehicles, it is rational to use the energy indicators of the vehicle, for which it is necessary to develop appropriate assessment criteria. Analysis of the results of indicators calculation and, in table 1, has shown that the indicator in comparison with has less dispersion. Originality. The obtained results of the influence of the parameters of vehicles on the level of their energy load shows that the indicator has less dispersion than. In addition, the value does not correlate with the year of manufacture of the vehicle, which allows the use of this indicator at the design stage of vehicles. It is only necessary to set the rational normative value of this indicator. Practical value. The results obtained can be recommended to specialists for use in the design, production, certification and operation of automotive vehicles, vehicle energy efficiency, combined power plant.
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García, Lino O., Frank R. Wilson, and J. David Innes. "Heavy Truck Dynamic Rollover: Effect of Load Distribution, Cargo Type, and Road Design Characteristics." Transportation Research Record: Journal of the Transportation Research Board 1851, no. 1 (January 2003): 25–31. http://dx.doi.org/10.3141/1851-03.
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The dynamic response of a five-axle tractor–trailer unit carrying loads of various weights was evaluated under actual operating conditions as the vehicle traveled along roadway curves with various radii. A data acquisition system (DAS) was designed and developed to record information for a vehicle moving at highway speeds. The DAS used sensors interfaced to a central processing unit. The test runs were performed over a total of 1,110 km of highway under three load configurations: empty, loaded with less than the truck load, and loaded with bottled spring water packed in boxes. Data on lateral, longitudinal, and vertical accelerations; steering activity; vehicle speed; and roll angle of the trailer were recorded. It was found that in most cases the average level of lateral acceleration exhibited on both the tractor and the trailer exceeded expected values calculated for the curves on the basis of geometric design characteristics. Comparisons of actual results with theoretical considerations confirmed this observation. Analyses of field data indicated that under certain motion and load conditions, the occasional peak lateral acceleration values generated were in the vicinity of rollover threshold values estimated for the instrumented vehicle. The results also showed that although the vehicle traveled at or below the posted speed limit in the majority of cases, lateral accelerations recorded for the trailer exceeded expected lateral accelerations under all load configurations. This suggests the need to consider establishing speed limits on curves that take into consideration the different responses of heavy trucks compared with those of smaller and lighter vehicles.
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Lu, Yongjie, Tongtong Wang, and Hangxing Zhang. "Multiobjective Synchronous Control of Heavy-Duty Vehicles Based on Longitudinal and Lateral Coupling Dynamics." Shock and Vibration 2022 (July 21, 2022): 1–19. http://dx.doi.org/10.1155/2022/6987474.
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The steering system, suspension system, and braking system of the vehicle are interrelated, so the ride comfort and handling stability of the vehicle are also closely related. But the vertical and lateral dynamics equations and controls system of the vehicle are always independent of each other, and the multiobjective control is generally achieved through the coordination of control algorithms. In this paper, taking the dynamic load of the tire as a link, the vertical dynamic model and the lateral dynamic model of heavy-duty vehicle are coupled. When the heavy-duty vehicle is turning, the proposed coupling model not only reflects the influence of the front wheel angle on the vertical motion and the vertical tire load, but also reflects the unevenness of the road surface on vehicle lateral motion. In order to improve the handling stability and transient safety of the vehicle, a synchronous control system combining six-wheel steering and front wheel active steering is proposed. It solves the problem that it is difficult to effectively track the desired yaw rate for the three-axle all-wheel steering vehicle with the middle rear wheel angle as the control input. Under the framework of the vehicle vertical/lateral unified coupling dynamics model, the semiactive suspension system controlled by fuzzy PID and the six-wheel active steering system combined with fuzzy control and fuzzy PID control are integrated. It is verified that the synchronous control method effectively optimizes the vertical and lateral motion characteristics of heavy-duty vehicles during steering and, at the same time, improves the ride comfort and steering stability.
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He, Yi, Shao Jie Du, and Guang Wei Cheng. "Modeling and Simulation of Disc Brake Resistance Load in Low Speed Condition." Advanced Materials Research 548 (July 2012): 691–95. http://dx.doi.org/10.4028/www.scientific.net/amr.548.691.
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In this paper, the load simulation of tracked vehicle disc brake in low speed is discussed. The simulation of the resistance load and the control of the disc brake is researched when the resistance load loading on the test bench The simulation results show that, by controlling the input voltage of the disc brake electrohydraulic control portion, the disc brake braking torque can be controlled, the driving resistance simulation of crawler vehicle is realized. At the same time, the simulation has high accuracy, fast response speed, and has better dynamic characteristic. When the tracked vehicle is at the process of start, acceleration, deceleration, braking, steering , the engine and the transmission system mainly are in an unstable vehicle system dynamic, the load is dynamic load must be given. In order to investigate the performance of tracked vehicle HMCVT, a dynamic load [1] in the test system to simulate the loading process of tracked vehicle. Eddy current dynamometer can simulate the load [2,3] during a vehicle running a higher speed , the driving load in low speed ( including zero speed ) is simulated by disc brakes .
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Yang, Hui, Weiming Yan, and Haoxiang He. "Parameters Identification of Moving Load Using ANN and Dynamic Strain." Shock and Vibration 2016 (2016): 1–13. http://dx.doi.org/10.1155/2016/8249851.
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Moving load identification is an important part of bridge structure health monitoring; accurate and reliable load data can be used to check the load of bridge design, and the load spectrum can provide a more practical basis for structural fatigue analysis. The method of the BP neural network is used in bridge moving loads identification. The numerical examples of identification of the axle loads of a two-axle vehicle moving on a simply supported bridge under various speeds and weights are carried out. The sensitivity of the bridge deflection and strain to moving loads is analyzed, and the influences of different activation function combinations and algorithm on network are discussed. The identification results of different load conditions are analyzed and the effect of noise is considered. Finally the rationality of the method is verified by experiments. It is shown that the indirect estimation of vehicle weight by BP neural network from dynamic responses is feasible.
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Guo, Fei, Heng Cai, and Huifang Li. "Impact Coefficient Analysis of Curved Box Girder Bridge Based on Vehicle-Bridge Coupling." Mathematical Problems in Engineering 2022 (January 10, 2022): 1–11. http://dx.doi.org/10.1155/2022/8628479.
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In the current vehicle-bridge dynamics research studies, displacement impact coefficients are often used to replace the moment and shear force impact coefficients, and the vehicle model is also simplified as a moving-load model without considering the contribution of vehicle stiffness and damping to the system in some concerned research studies, which cannot really reflect the mechanical behavior of the structures under vehicle dynamic loads. This paper presents a vehicle-bridge coupling model for the prediction of dynamic responses and impact coefficient of the long-span curved bending beam bridge. The element stiffness matrix and mass matrix of a curved box girder bridge with 9 freedom degrees are directly deduced based on the principle of virtual work and dynamic finite element theory. The vibration equations of vehicle-bridge coupling are established by introducing vehicle mode with 7 freedom degrees. The Newmark-β method is adopted to solve vibration response of the system under vehicle dynamic loads, and the influences of flatness of bridge surface, vehicle speed, load weight, and primary beam stiffness on the impact coefficient are comprehensively discussed. The results indicate that the impact coefficient presents a nonlinear increment as the flatness of bridge surface changes from good to terrible. The vehicle-bridge coupling system resonates when the vehicle speeds reach 60 km/h and 100 km/h. The moment design value will maximally increase by 2.89%, and the shear force design value will maximally decrease by 34.9% when replacing moment and shear force impact coefficients with the displacement impact coefficient for the section internal force design. The load weight has a little influence on the impact coefficient; the displacement and moment impact coefficients are decreased with an increase in primary beam stiffness, while the shear force impact coefficient is increased with an increase in primary beam stiffness. The theoretical results presented in this paper agree well with the ANSYS results.
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Jiang, Wanlin, Liu Miao, Yan Wang, Yutao Gan, Shoutian Jiao, Hao Zhang, and Taolong Xu. "Study on Dynamic Response of Buried Pipeline Rolled by Heavy Vehicle Based on Co-simulation by ADAMS and ABAQUS." Journal of Physics: Conference Series 2185, no. 1 (January 1, 2022): 012018. http://dx.doi.org/10.1088/1742-6596/2185/1/012018.
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Abstract At present, the rolling load of heavy vehicles has become one of the main ground loads threatening the safety of buried pipelines. In this paper, the vehicle simulation is carried out based on ADAMS to extract the wheel force. At the same time, the pipeline soil coupling model is established based on ABAQUS. The amplitude of the random moving load extracted by ADAMS is used for finite element simulation calculation, the dynamic response process of the pipeline is simulated, and the stress distribution of the buried pipeline under the vehicle rolling load is obtained. Aiming at the pipeline stress concentration area, that is, the most vulnerable area of the pipeline, the pipeline load reduction and prevention and control measures are proposed, and the four measures are compared, which provides theoretical support for the actual engineering prevention and control.
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Papagiannakis, A. T., K. Senn, and H. Huang. "On-Site Calibration Evaluation Procedures for WIM Systems." Transportation Research Record: Journal of the Transportation Research Board 1536, no. 1 (January 1996): 1–11. http://dx.doi.org/10.1177/0361198196153600101.
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The feasibility of two methods for evaluating and calibrating weigh-in-motion (WIM) systems is explored. The first method uses a combination of test trucks and vehicle simulation models. The computer model VESYM was used for the simulations. The models for the test trucks were calibrated using acceleration measurements on board the vehicles. Although, this approach does not allow calculation of the discrete value of the dynamic axle load over WIM sensors, it can be used effectively in establishing the extent of variation at a particular WIM site. This information leads to an effective WIM system calibration method. The second method for calibrating WIM systems compares static and dynamic axle loads of vehicles through automatic vehicle identification (AVI). The AVI facilities developed for the Heavy Vehicle Electronic License Plate project on the I-5 corridor was used for this purpose. The static axle load of AVI-equipped vehicles was obtained from the Oregon Department of Transportation for two sites, Woodburn southbound and Ashland northbound. The WIM load data were obtained from Lockheed IMS for all the AVI-equipped WIM systems on the I-5 corridor. The data were analyzed to match AVI numbers, dates, and times of weighing. Time limits for traveling between sites were established to ensure that trucks could not stop and load or unload cargo between sites. Errors were calculated as the percentage difference between WIM and static loads for individual axles and axle groups. Calibration factors were derived to minimize the residual sum of squares of the errors.
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Qin, Fang, Chao An, Xiao Feng Gao, and Le Le Zhang. "Review on Airtight Fatigue Strength Research of the New Generation High-Speed Train." Applied Mechanics and Materials 246-247 (December 2012): 970–73. http://dx.doi.org/10.4028/www.scientific.net/amm.246-247.970.
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Structure failure risk caused by air wave on high-speed vehicle airtight body is considered and it’s necessary to bring out the conception of airtight fatigue strength and start related research. There is a review of airwave and structure fields, including air dynamic of rail-vehicle, load carrying structure and strength test standard. Nowadays, the direction of air dynamic research is focused on how to reduce air wave pressure and enhance stability of running vehicle; the structure study is focused on static and transient load carrying response of wheels, bogie and so on structures under traction running and weight load. It’s not been fully researched that how the airtight structure vehicles response when carrying air-dynamic in long run. Based on current research, an analysis line is brought out which contains simulation and experiment, fluid-structure interaction study and structure fatigue assessment calculation
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Kim, Kun-Woo, Jae-Wook Lee, Jin-Seok Jang, Joo-Young Oh, Ji-Heon Kang, Hyung-Ryul Kim, and Wan-Suk Yoo. "Dynamic load applied to shear pin and motion prediction of flexible hose." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 22 (August 10, 2016): 4172–85. http://dx.doi.org/10.1177/0954406216663781.
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A flexible hose that is unwound along with fiber-optic cables from a mother ship helps prevent interference with the mother ship during the unwinding of the fiber-optic cable. Because the density of fiber-optic cables is close to the fluid density, if there is no flexible hose, the fiber-optic cable is more likely to interfere with the mother ship because of the motion of underwater vehicles or mother ships. Hence, it is necessary to prevent the interference of fiber-optic cables by using flexible hoses made of stainless steel. Flexible hoses unwound as an underwater vehicle moves are coupled to the vehicle by shear pins, and once all flexible hoses are unwound, the underwater vehicle continues to move forward as the pins fracture. Here, a dynamic load applied on the shear pin for connection in the early stages of the unwinding of the flexible hose is an important factor that controls the position, which should be accurately predicted, prior to the motion of the underwater vehicle. Further, it is essential that the shear pin of the connection part be designed to fracture under the selected load so that underwater vehicle can continue to move forward as the pin breaks. In this study, analysis results based on loading information measured in real experiments were compared and verified, and based on the findings, an analytical model that can predict loads applied on the shear pin was developed.
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Lee, Jae Yun, Moon Kyu Lee, Jae Geun Oh, and Kwang Soo Kim. "Study on the Energy Conversion from the Dynamic Load of Vehicles on the Road Using Piezoelectric Materials." Materials Science Forum 658 (July 2010): 57–60. http://dx.doi.org/10.4028/www.scientific.net/msf.658.57.
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Many researchers have studied the harvesting from discarded energy such as solar energy, wind and vibration because of the exhaustion of fossil fuel and the environmental pollution. Particularly, vibration-based energy harvesting has increasingly received an attention in last decade. Therefore, the aim of study is to analyze the characteristics of piezoelectric materials to be used in the energy conversion system on vehicle road. At first, the dynamic loads of vehicle on the road are measured with respect to the weight and speed prior to analyzing the characteristics of piezoelectric materials. Then, the energy conversion amount of piezoelectric element is quantified for its size and type under the load profiles. The vehicle dynamic load is the average of 200kgf. The result indicates that the dynamic vehicle load is less affected by the speed. The generated voltage is 1.8kV, and extracted energy is 0.11mJ from one under the load of 8kgf applied on piezoelectric element. The power extracted from one passenger vehicle is able to operate a sensor and transmit acquisition data.
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Song, Chang Li, and Jing Ji. "Dynamic Characteristics of Bridge under Moving Constant Load." Advanced Materials Research 532-533 (June 2012): 306–10. http://dx.doi.org/10.4028/www.scientific.net/amr.532-533.306.
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It is very important to carry out research of dynamic performance and acquire data of bridge. it can provide reference for design of bridge. Combined with a bridge in actual engineering, this paper analyzes the deformation of bridge subjected to vehicles with different velocities. Based on typical theory on vibration analysis between bridge and vehicles and simplified model, finite element model of simple-supported bridge is established by ANSYS software, and concrete process of modeling, solving, analyzing and dealing is introduced. Through the numerical simulation analysis dynamic response characteristics of the bridge body are acquired when the vehicle passes through the bridge at different speeds, variable regularity is given for dynamic response and these can provide good reference for controlling the vibration measures of bridge under moving loads.
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Nassif, Hani H., and Ming Liu. "Analytical Modeling of Bridge-Road-Vehicle Dynamic Interaction System." Journal of Vibration and Control 10, no. 2 (February 2004): 215–41. http://dx.doi.org/10.1177/1077546304033950.
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We present a three-dimensional (3D) dynamic model for the bridge-road-vehicle interaction system. A slab-on-girder bridge is modeled as a grillage system subjected to multiple moving truck loads. Multi-axle semi-tractor-trailer is idealized as a 3D vehicle model with a nonlinear tire-suspension system, having eleven independent degrees of freedom. Road roughness profiles are generated from the random Gaussian process as well as limited measurements of actual road profiles. Truck wheel loads are applied at any point and then transferred to nodes as equivalent nodal forces. The Newmark-\#946; integration method is applied as a numerical algorithm for solving the bridge-road-vehicle dynamic interaction equations. The major parameters affecting the bridge dynamic response (or the dynamic load factor) include road roughness, truck weight, speed and mechanical properties of the tire-suspension system and bridge stiffness and boundary conditions. Results from other dynamic models as well as field tests are compared with those from the current 3D model. The results show that the dynamic load factor is highly dependent on road roughness, vehicle suspension, and bridge geometry.
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Xu, Rui Liang, and Tao Yang. "Mechanical Properties of Soil under Vehicle Load." Applied Mechanics and Materials 633-634 (September 2014): 1095–99. http://dx.doi.org/10.4028/www.scientific.net/amm.633-634.1095.
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Based on the analysis of relevant characteristics of the traffic load, explores the impact of static and dynamic vehicle type, shaft type factors,and cars on the road, down to analyze the stress level in the soil loads -deformation relationship Through theoretical analysis, research, and future prospects, the measures proposed to solve the problem, come to study the mechanical properties of the program under the vehicle load soil and make the outlook for future work in this area terramechanics.
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Li, Qian, Jun Qing Liu, and Hong Liu. "Random Dynamic Response Analysis of Asphalt Pavement Based on the Vehicle-Pavement Interaction." Applied Mechanics and Materials 744-746 (March 2015): 1288–97. http://dx.doi.org/10.4028/www.scientific.net/amm.744-746.1288.
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In order to analyze the dynamic response of asphalt pavement under vehicle load, the random characteristic of pavement roughness was considered and the vehicle was simplified into 1/2 model with four freedom degrees when establishing the dynamic load model. Then the sequence of the random dynamic load coefficient was obtained by developing a MATLAB program based on the incremental Newmark-β method. Based on the plane strain assumption, a two-dimensional layered finite element model of asphalt pavement was established by ABAQUS software. Then the dynamic load coefficient was used to modify tire pressure that would be applied on the ABAQUS model. Then dynamic response rule of the model and how it was effected by vehicle speed were studied under random load. The results show that under the condition of random load, dynamic response of the pavement structure exhibiting a fluctuation trend as vehicle speed increases and the dynamic response characteristics of each point is different.
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Mikhail, Magdy Y., and Michael S. Mamlouk. "Effect of Vehicle-Pavement Interaction on Pavement Response." Transportation Research Record: Journal of the Transportation Research Board 1570, no. 1 (January 1997): 78–88. http://dx.doi.org/10.3141/1570-10.
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The structural response of flexible pavements is studied under different dynamic loads and pavement roughness conditions. The factors affecting dynamic load variability are investigated with regard to pavement-vehicle interaction. Furthermore, the study considers the viscoelastic nature of asphalt concrete and the nonlinearity and plasticity of granular and subgrade materials. The Florida COMPAS computer program was used to estimate the dynamic wheel force, and the ABAQUS three-dimensional finite-element program was used to determine the pavement response. The effects of vehicle and pavement characteristics such as vehicle type, vehicle speed, suspension type, level of roughness, pavement stiffness, and layer thickness were studied and statistically analyzed. The walking-beam suspension causes more dynamic load variation than the air-bag and leaf-spring suspension. The dynamic load coefficient for the walking-beam suspension is approximately twice the other suspensions. Vehicle speed is an important factor; the 20 km/hr speed resulted in permanent displacement approximately 10 times the permanent displacement produced by the 130 km/hr speed. The pavement response varies with distance due to roughness. Pavement stiffness and thickness had some effect on pavement response, but truck type and truck suspension type did not have a large effect.
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Xu, Xun Qian, Ye Yuan Ma, Guo Qing Wu, and Xiu Mei Gao. "Dynamic Response of the Steel Bridge Deck Thin Surfacing due to Vehicle Load." Advanced Materials Research 148-149 (October 2010): 544–47. http://dx.doi.org/10.4028/www.scientific.net/amr.148-149.544.
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Basing on the coupled vibration theory, dynamic behavior of steel bridge deck thin surfacing under rand moving vehicles is studied. A three-dimensional coupled model is carried out for the steel bridges deck thin surfacing and vehicle. A method based on modal superposition and state space technique is developed to solve dynamic response generated by vehicle-surfacing interaction. The dynamic responses of an actual steel bridge deck thin surfacing are studied. The results show that adding epoxy asphalt as a sub coat can improve interface adhesion strength, which would be designed as the interface layer of steel deck thin surfacing.