Coupling analysis of transient aerodynamic and dynamic response of articulated heavy vehicles under crosswinds

Abstract Dynamic interactions between the mixed traffic situations and the pavement are investigated through analysis of accumulated stored energy within the pavement. The proposed methodology integrates the dynamic response of heavy vehicles population within the mixed traffic with the primary pavement response and an objective pavement damage measure. The results attained from the proposed methodology revealed reasonably good correlation with the AASHO data on the rut depth. The proposed methodology is applied to establish the influence of traffic distribution, time of the day, weather temperature condition, average traffic speed and the type of traffic distribution on the accumulated stored energy of the pavement. The results show that a uniform traffic distribution can yield considerable reduction in the stored energy and thus the damage potentials of the mixed traffic.

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Theoretical Road Damage Due to Dynamic Tyre Forces of Heavy Vehicles Part 1: Dynamic Analysis of Vehicles and Road Surfaces

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1243/pime_proc_1988_202_095_02 ◽

1988 ◽

Vol 202 (2) ◽

pp. 103-108 ◽

Cited By ~ 9

Author(s):

D Cebon

Keyword(s):

Dynamic Response ◽

Dynamic Analysis ◽

Full Scale ◽

Heavy Vehicles ◽

Road Vehicles ◽

Vehicle Simulation ◽

The Road ◽

Road Surfaces ◽

Full Scale Tests

Theory is presented for simulating the dynamic wheel forces generated by heavy road vehicles and the resulting dynamic response of road surfaces to these loads. Sample calculations are provided and the vehicle simulation is validated with data from full-scale tests. The methods are used in the accompanying paper to simulate the road damage done by a tandem-axle vehicle.

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Dynamic Coupling Analysis of Vehicle-Bridge System for Long-Span Suspension Bridge Based on Backpropagation Neural Network Method

Advances in Civil Engineering ◽

10.1155/2020/5878426 ◽

2020 ◽

Vol 2020 ◽

pp. 1-11

Author(s):

Zuolong Luo ◽

Xiaobo Zheng ◽

Haoyun Yuan ◽

Xirong Niu

Keyword(s):

Neural Network ◽

Finite Element ◽

Dynamic Response ◽

Suspension Bridge ◽

Suspension Bridges ◽

Dynamic Coupling ◽

Coupling Analysis ◽

Long Span ◽

Coupling System ◽

Bridge System

As the suspension bridge structures become more flexible and the forms of the vehicle load become more diverse, the dynamic coupling problem of the vehicle-bridge system has become gradually prominent in long-span suspension bridges, resulting in an increase in accuracy and efficiency requirements for dynamic coupling analysis of the vehicle-bridge system. Conventional method such as finite element method (FEM) for dynamic coupling analysis of vehicle-bridge system often requires separate iteration of vehicle system and bridge system, and the contact and coupling interactions between them are used as the link for convergence inspection, which is too computationally intensive and time-consuming. In addition, the dynamic response of the vehicle-bridge coupling system obtained by FEM cannot be expressed explicitly, which is not convenient for engineering application. To overcome these drawbacks mentioned above, the backpropagation (BP) neural network technology is proposed to the dynamic coupling analysis of the vehicle-bridge system of long-span suspension bridges. Firstly, the BP neural network was used to approximate the dynamic response of the suspension bridge in the vehicle-bridge coupling system, and the complex finite element analysis results were thus explicitly displayed in the form of a mathematical analytical expression. And then the dynamic response of the suspension bridge under vehicle load was obtained by using a dynamic explicit analysis method. It is shown through a numerical example that, compared with FEM, the proposed method is much more economical to achieve reasonable accuracy when dealing with the dynamic coupling problem of the vehicle-bridge system. Finally, an engineering case involving a detailed finite element model of a long-span suspension bridge with a main span of 1688 m is presented to demonstrate the applicability and efficiency under the premise of ensuring the approximation accuracy, which indicates that the proposed method provides a new approach for dynamic coupling analysis of the vehicle-bridge system of long-span suspension bridges.

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Effect of Service Speed on Dynamic Response of Heavy-Load Depressed Center Flat

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.226-228.802 ◽

2012 ◽

Vol 226-228 ◽

pp. 802-806

Author(s):

Su Xia Zhou ◽

Teng Long ◽

Yun Ye Xie ◽

Ji Long Xie

Keyword(s):

Dynamic Response ◽

Rigid Body ◽

Vertical Vibration ◽

Elastic Displacement ◽

Heavy Vehicles ◽

Heavy Load ◽

Vibration Displacement ◽

Flexible Coupling ◽

Elastic Vibrations ◽

Vertical Displacements

In order to study the dynamic response characteristics of depressed center flat car with different velocity, based on multi-body system dynamics software SIMPACK, 320t depressed center flat car system rigid body and rigid-flexible coupling-body dynamics model were established and the dynamic response simulation analysis of empty and loaded flat was carried out under several velocities. Then maximal vertical vibration displacement amplitudes and vertical vibration accelerations of depressed centre flat frame under different velocities were obtained. It showed that the maximum accelerations and displacements amplitudes increase with as the speed gradually increased for both empty and heavy vehicles and the trends are similar for the rigid body or rigid-flexible coupling-body. But the values of rigid-flexible coupling-body are bigger than that of rigid body because the elastic vibrations from the depressed center flat frame and all levels of suspension contribut to the vertical displacement. As the speed increases, the vertical displacements of the rigid-flexible coupling-body and the elastic ones response synchronously. The vertical displacements of the empty and heavy vehicles reach their peak values at different speeds and the elastic displacement also has a large proportion, which shows that there are larger elastic vibrations at the speeds. Therefore, it is not suitable for the depressed centre flat to run at very high speeds, and the speed should be confined.

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