ASME 2014 International Design and Engineering Technical Conferences & Computers and Information in Engineering Conference - IDETC/CIE 2014, Buffalo (United States of America). 17-20 Agosto 2014
Summary:
The objective of this investigation is to develop a low order continuum-based liquid sloshing model that can be successfully integrated with multibody system (MBS) algorithms. The liquid sloshing model proposed in this investigation allows for capturing the effect of the distributed inertia and viscosity of the fluid. The fluid viscous forces are defined using the Navier-Stokes equations. In order to demonstrate the use of the approach presented in this study, the assumption of an incompressible Newtonian fluid is considered with a total Lagrangian approach. Fluid properties such as the incompressibility condition are formulated using a penalty method. The low order model that captures the effect of the distributed fluid inertia on the vehicle dynamics is developed in this investigation using the floating frame reference (FFR) formulation. The use of this approach allows for developing an inertia-variant fluid model that accounts for the dynamic coupling between different modes of the fluid displacements. The matrix of position vector gradients and its derivative are formulated using the FFR kinematic description. The position and velocity gradient tensors are used to define the Navier-Stokes stress forces. The proposed liquid sloshing model is integrated with a MBS railroad vehicle model in which the rail/wheel interaction is formulated using a three-dimensional elastic contact formulation that allows for the wheel/rail separation. Several simulation scenarios are used to examine the effect of the distributed liquid inertia on the motion of the railroad vehicle. The results, obtained using the sloshing model, are compared with the results obtained using a rigid body vehicle model. The comparative numerical study presented in this investigation shows that the effect of the sloshing tends to increase the possibility of wheel/rail separation, thereby increasing the possibility of derailments.
Publication date: August 2014.
Citation:
Wang, J.L., Jiménez-Octavio, J.R., Wei, C., Shabana, A.A., Low order continuum-based liquid sloshing formulation for vehicle system dynamics, ASME 2014 International Design and Engineering Technical Conferences & Computers and Information in Engineering Conference - IDETC/CIE 2014, Buffalo (United States of America). 17-20 August 2014.
