T-2-2-3 Development of A Multibody Dynamics Simulation Tool for Tracked Vehicles, Part I : Efficient Contact and Nonlinear Dynamic Modeling
01 Jan 2002-Vol. 2002, pp 139-147
About: The article was published on 2002-01-01. It has received 15 citations till now. The article focuses on the topics: Multibody system & Vehicle dynamics.
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15 Jun 2003-Jsme International Journal Series C-mechanical Systems Machine Elements and Manufacturing
TL;DR: In this article, the nonlinear dynamic modeling methods for the virtual design of tracked vehicle are investigated by using multibody dynamic simulation techniques, which include high oscillatory signals resulting from the impulsive contact forces and the use of stiff compliant elements to represent the joints between the track links.
Abstract: In this paper, the nonlinear dynamic modeling methods for the virtual design of tracked vehicle are investigated by using multibody dynamic simulation techniques The results include high oscillatory signals resulting from the impulsive contact forces and the use of stiff compliant elements to represent the joints between the track links Each track link is modeled as a body which has six degrees of freedom, and two compliant bushing elements is used to connect track links The efficient contact search kinematics and algorithms in the context of the compliance contact model are developed to detect the interactions between track links, rollers, sprockets, and ground for the sake of speedy and robust solutions In order to validate the developed nonlinear multibody dynamic model against the experimental measurements, several empirical techniques are suggested and applied to the physical proving ground tests of the high mobility tracked vehicle In this empirical validations, positions, velocities, accelerations and forces of the chassis and the track sub-systems are correlated accordingly
36 citations
TL;DR: A survey of continuum-based soil models and their suitability for integration with the finite element (FE) and multibody system (MBS) algorithms is presented in this paper, where a Cam-Clay soil model is used to explain how such continuum-mechanics based soil models can be implemented in FE/MBS algorithms.
Abstract: : The mechanical behavior of soils may be approximated using different models that depend on particular soil characteristics and simplifying assumptions. For this reason, researchers have proposed and expounded upon a large number of constitutive models and approaches that describe various aspects of soil behavior. However, there are few material models capable of predicting the behavior of soils for engineering applications and are at the same time appropriate for implementation into finite element (FE) and multibody system (MBS) algorithms. This paper presents a survey of some of the commonly used continuum-based soil models. The aim is to provide a summary of continuum-based soil models and examine their suitability for integration with the large-displacement FE absolute nodal coordinate formulation (ANCF) and MBS algorithms. Special emphasis is placed on the formulation of soils used in conjunction with vehicle dynamics models. The implementation of these soil models in MBS algorithms used in the analysis of complex vehicle systems is also discussed. Because semi-empirical terramechanics soil models are currently the most widely used to study vehicle/soil interaction, a review of classical terramechanics models is presented in order to be able to explain the modes of displacements that are not captured by these simpler models. Other methods such as the particle-based and mesh-free models are also briefly reviewed. A Cam-Clay soil model is used in this paper to explain how such continuum-mechanics based soil models can be implemented in FE/MBS algorithms.
21 citations
TL;DR: Results show that realistic behavior of the chain as well as out-of-plane vibration can be easily captured using the presented approach, which can be used to model complex drive chain, bicycle chain aswell as conveyance systems.
Abstract: This paper presents an efficient approach for modeling chain derives using multibody dynamics formulation based on the spatial algebra. The recursive nonlinear dynamic equations of motion are formulated using spatial Cartesian coordinates and joint variables to form an augmented set of differential-algebraic equations. The spatial algebra is used to express the kinematic and dynamic equations leading to consistent and compact set of equations. The connectivity graph is used to derive the system connectivity matrix based on the system topological relations. The connectivity matrix is used to eliminate the Cartesian quantities and to project the forces and inertia into the joint subspace. This approach will result in a minimum set of equation and can avoid iteratively solving the system of differential and algebraic equations to satisfy the constraint equations. In order to accurately capture the full dynamics of the chain links, each link in the chain is modeled as rigid body with full 6 degrees of freedom...
12 citations
01 Jun 2003-Jsme International Journal Series C-mechanical Systems Machine Elements and Manufacturing
TL;DR: In this paper, a co-simulation tool is developed such that the performance of the track tension control system can be investigated for various maneuvering tasks, such as track tension is closely related to the maneuverability of tracked vehicles and the durability of tracks and suspension systems.
Abstract: Multi-body Dynamics simulation of tracked vehicles is very useful not only for the analysis of dynamic behaviors, but also for the performance evaluation of the chassis controllers. The track tension is closely related to the maneuverability of tracked vehicles and the durability of tracks and suspension systems. In order to minimize the excessive load on the tracks and to prevent the peal-off of tracks from the sprocket, the track tension needs to be maintained at the optimum level throughout the maneuver. In this paper, a co-simulation tool is developed such that the performance of the track tension control system cart be investigated for various maneuvering tasks. The MBD (multi-body dynamics) vehicle model for tracked vehicles is very complicated (189 bodies, 36 revolute joints, 152 bushing elements and 954 degrees of freedom) and cannot be easily implemented in commercial software. Besides, the track tension controller based on fuzzy logic can be easily constructed in the commercial control software. Therefore, co-simulation methodology is proposed so that the designed tension controller is interfaced into the MBD simulation software. The performance of the tension control system is verified through the proposed co simulation tool.
12 citations
TL;DR: Experimental results from the prototype showed that the proposed design principle can accurately reflect the impact load and periodic torque fluctuations on the track and the maximum error between the simulated and experimental results is 5.4%.
7 citations