Effect of parameters on roll dynamic response of an articulated vehicle carrying liquids

In this paper, the effects of braking on dynamics of an articulated vehicle carrying liquid have been examined. To investigate the interaction between the fluid and the vehicle, a model of an articulated vehicle with a two-axle semitrailer has been used. The articulated tank vehicle has been modeled as a multi-body system with seven degrees of freedom (DOF) for the truck and seven DOF for the semitrailer. Also, Euler and Laplace's equations have been used to examine the longitudinal fluid slosh. Solving Euler's equation, the pressure exerted by the fluid to the tanker at any moment has been calculated and the resultant force at any moment has been obtained. The equations of motions are solved numerically using the Runge-Kutta method. Using the simulation results, the effects of fluid density, fill volume of the tanker, and braking intensity on dynamical parameters of the vehicle have been studied. Simulation results showed that decrease in the fill volume leads to decrease in the dynamic normal load factor of the rear axle of the semitrailer. Also, comparison of frequency response of longitudinal resultant force of the liquid and longitudinal velocity of semitrailer shows that dominant frequency of oscillation of these parameters is equal. It can be concluded that fluid sloshing is one of the main factors of oscillation of the semitrailer body and the forces between tractor and semitrailer.

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“…Substituting equations (10) and (11) into equation (8) and considering irrotational flow, the following relationship is obtained:…”

Section: The Bodies Of Semitrailer and Tractormentioning

confidence: 99%

Investigation of sloshing effects on dynamic response of an articulated vehicle carrying liquids

Jalili

Motavasselolhagh

Fatehi

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…In the coupling method, the fluid slosh model and vehicle dynamic models are analysed so that they exchange data in a predetermined time step. 21,22 Rumold 23 combined the two-dimensional CFD model for a rectangular tank with the three degrees of freedom (DOFs) pitch-plane model of a truck. The results show that the peak values of the oscillatory behaviour of deceleration and axle load compared to a truck with a rigid equivalent load are much larger.…”

Section: Introductionmentioning

confidence: 99%

Development of a coupled numerical model for the interaction between transient fluid slosh and tank wagon vibration

Rahmati-Alaei

Sharavi

Zakaria³

2018

Proceedings of the Institution of Mechanical Engineers, Part K:

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In this paper, a coupled model is developed to evaluate the effect of transient fluid slosh on the railway tank wagon dynamic vice versa. This model has computational complexity in solving the Navier–Stokes equations and nonlinear differential equations of tank wagon vibration with nonlinear wheel–rail contact. The coupled model can be used as an effective and robust tool compared to simplified models for assessing the stability of tank wagon. The transient fluid slosh model is analysed using the computational fluid dynamic method combined with the volume of fluid technique. The tank wagon dynamic model is solved using the fourth-order Runge–Kutta method based on the 19 degrees of freedom model with longitudinal, vertical, roll and pitch vibrations. The wheel–rail contact is considered according to nonlinear Hertzian and Kalker linear rolling contact theories. The fluid slosh model is validated using experimental data. The dynamic response characteristics of the partially filled railway tank wagon are investigated under straight-line braking manoeuvre using the coupled model. The results obtained from a parametric study, including the cross sectional shape and the filled volume show that the modified-oval cross section improves the dynamic response characteristics, which are attributed to its lower fluid's centre of gravity coordinate in the longitudinal direction and low lateral moment transfer of the fluid.

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“…The free-liquid surface in road tankers can experience massive displacement for even slight motions of the container, which can cause undesirable effects on the stability and controllability of the vehicle [15]. The lateral dynamics of a vehicle can be influenced by three factors that are caused by liquid sloshing in a tanker [16]. These factors are the inertia force, due to the bulk motion of the liquid; the induced force, due to the change in the center of gravity of the fluid cargo; and the resonance force, due to the sloshing frequency and natural frequency of the vehicle.…”

Section: Liquid Sloshing In Road Tankersmentioning

confidence: 99%

Optimum Redesign of an Agricultural Water Bowser

Seechurn

Boodhun

2018

Designs

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There are many types of agricultural water bowsers on the market, which vary in geometry and size. However, in all such bowsers there are “unused spaces” between the bottom of the tank and the axle. The objective of this research was to design an agricultural water bowser with improved capacity by exploiting the “unused spaces”. This would allow a sufficient amount of water to be supplied to wide areas in a short time. Each concept of agricultural water bowser was generated as an integrated chassis water tank to be hitched to a tractor, and the best concept was chosen using a multi-criteria decision-making methodology (house of quality matrix and Pugh selection matrix). The selected design consisted of an U-shaped angle bent bottom sheet welded to a top circular sheet. The Agreement Dangerous Road (ADR) European standard was used for the sizing of the bowser and the selected material was S275 steel. The resultant forces on the shell of the bowser were calculated using analytical methods. A 3-D model of the bowser was developed in SolidWorks 2015, and the static structural analysis tool was used to examine stresses on the body for various types of loading, roads, and driving maneuvers. The shape and size of the bottom part of the proposed bowser increased the capacity of the tank by 20.3%.

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Effect of parameters on roll dynamic response of an articulated vehicle carrying liquids

Cited by 18 publications

References 16 publications

Investigation of sloshing effects on dynamic response of an articulated vehicle carrying liquids

Investigation of sloshing effects on dynamic response of an articulated vehicle carrying liquids

Development of a coupled numerical model for the interaction between transient fluid slosh and tank wagon vibration

Optimum Redesign of an Agricultural Water Bowser

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