Journal Article•
Modelling of tracked vehicle dynamics
About: This article is published in Journal of KONES.The article was published on 2010-01-01 and is currently open access. It has received 12 citations till now. The article focuses on the topics: Suspension (vehicle) & Vehicle dynamics.
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Journal Article•
24 citations
Cites background from "Modelling of tracked vehicle dynami..."
...The equation (3) represents a system of n differential equations with n+munknown variables that correspond to the acceleration vector of ḣ and the Lagrange vector of multipliers....
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TL;DR: The design and modification of the tracked vehicle suspension system is now supported with the vehicle motion numerical simulations based on the principles of multibody dynamics, making it possible to reduce experimental testing costs and shorten the time of the new product commercialization.
Abstract: The design and modification of the tracked vehicle suspension system is now supported with the vehicle motion numerical simulations based on the principles of multibody dynamics. Such analyses make it possible to reduce experimental testing costs and shorten the time of the new product commercialization. In terms of the vehicle motion nature simulation, it is essential to take account of the impact of the track on the suspension system as this enables precise selection of the suspension components. A conventional tracked vehicle suspension system incorporates not only metal elements but also bushings made of rubber or other materials [17]. The material diversity of subassemblies and the vehicle operation time make it difficult to determine the forces acting in the track segments. A change in parameters describing the phenomena occurring in this area (cf. Fig. 1) has a direct effect on the performance of the vehicle entire suspension system. The system properties are also affected by the track wear level, which is difficult to assess. Depending on the manufacturer, the track service life is estimated at the level of about 2000 km. The environment of the track system operation is another significant factor. For example, high air dustiness increases the intensity of wear [9]. According to [2], the forces occurring in the track system can be identified through testing carried out on a test stand. A method of the track tension determination in real time is presented in [14]. The method finds application in active suspension systems. Identification of the properties of damping elements of the tracked vehicle suspension with the use of neural networks is presented in [21, 22]. Sankar et al. [20] and Dhir & Sankar [7] developed a model for dynamic simulation of tracked vehicles with independent suspension, offering the possibility of using linear or nonlinear characteristics of spring and damping elements. A numerical simulation in the time domain makes it possible to improve the crew’s comfort and safety by observing the suspension system performance. In [18], optimization of the suspension system spring elements is taken into consideration, adopting the criterion of minimization of the driver’s seat vertical acceleration values during 8-hour exposure to vibrations. Gregory M. Hulbert et al. [10] developed a method of the rocker design optimization using characteristics of the forces acting on the suspension node which are obtained from the vehicle simulation. In [16], the methodology of modelling hybrid drive systems and elements of the tracked vehicle suspension is presented. Choi et al. [6] present the Jacek GniłkA Arkadiusz Mężyk
8 citations
Cites methods from "Modelling of tracked vehicle dynami..."
...The methodology of the tracked vehicle modelling using multibody dynamics simulations is applied in [13], where results of a numerical analysis performed in the LMS Virtual....
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TL;DR: In this paper, a motion dynamics model of a sample military special vehicle, two suspension control algorithms and the results of three different numerical experiments that have been conducted are presented for the comparison of the amplitudes of displacement, speed and acceleration in time.
Abstract: The article presents a motion dynamics model of a sample military special vehicle, two suspension control algorithms and the results of three different numerical experiments that have been conducted. The applied measure of appraisal was the comparison of the amplitudes of displacement, speed and acceleration – both linear (in the vertical direction) and angular (in the longitudinal and transverse planes) in time.
4 citations
Cites methods from "Modelling of tracked vehicle dynami..."
...The equations of movement for the above model of the vehicle have been developed based on Lagrange formalism of the second kind [4]....
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Journal Article•
TL;DR: In this paper, a mathematical model is developed and simulated using Matlab and Simulink, which incorporates the compressibility of the fluid and expansion of other components using an effective bulk modulus and the damper valve characteristics.
Abstract: Battlefield mobility is one of the fundamental requirements of tracked military vehicles. The suspension provides the necessary ride, handling, and traction for the vehicle when traversing over either paved roads or on unprepared terrain. The Hydro-gas Suspension Unit (HSU) is one current state-of-the-art suspension technology with a huge potential for improvement in the future. In this work a mathematical model is developed and simulated using Matlab and Simulink. The model incorporates the compressibility of the fluid and expansion of other components using an effective bulk modulus and the damper valve characteristics. A novel method of modelling the flow through the damper valve using a lookup table is presented to overcome a problem with algebraic loops. Results from the model are discussed for different damper valve characteristics and input frequencies. The HSU model is incorporated into a simulation of a six-wheel station tracked vehicle having eight degrees of freedom, in order to study the ride quality of the vehicle and to propose a method for selecting the damper valve characteristics.
4 citations
References
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Book•
01 Jan 1988TL;DR: This book provides a concise introduction to the behavior of mechanical structures and testing their stochastic stability under the influence of noise, and explains the physical effects of noise and in particular the concept of Gaussian white noise.
Abstract: Computer Aided Analysis Of Mechanical Computer-aided design (CAD) is the use of computers (or workstations) to aid in the creation, modification, analysis, or optimization of a design. CAD software is used to increase the productivity of the designer, improve the quality of design, improve communications through documentation, and to create a database for manufacturing. CAD output is often in the form of electronic files for print ...
1,123 citations
Book•
17 Dec 1993
TL;DR: Dependent Coordinates and Related Constraints Equations are compared to Dynamic Analysis: Mass Matrices and External Forces for Real Time Dynamics.
Abstract: Dependent Coordinates and Related Constraints Equations- Kinematic Analysis- Dynamic Analysis: Mass Matrices and External Forces-Dynamic Analysis: Equations of Motion- Static Equilibrium Position and Inverse Dynamics- Numerical Integration of the Equations of Motion- Improved Formulations for Real Time Dynamics Linearized Dynamic Analysis- Special Topics-Forward Dynamics of Flexible Systems- Inverse Dynamics of Flexible Multibodies
888 citations
Journal Article•
TL;DR: In this article, the effects of the extra mass within the wheel assembly as it increases the unsprung mass of the vehicle were investigated and linear and non-linear single-wheel station models have been developed in order to quantify the effect of the modified design.
Abstract: Many military vehicles are being developed which use a hybrid electric drive system. Of these, a number utilise drive motors mounted within some or all of the road wheels. Of necessity these wheel-motor assemblies are somewhat heavier than the similar, existing, conventional road wheels. This extra mass has implications for both the ride within the vehicle and the design of the suspension-wheel-motor system. This paper looks at the implications of the extra mass within the wheel assembly as it increases the unsprung mass of the vehicle. Linear and non-linear singlewheel station models have been developed in order to quantify the effects of the modified design. A range of sprung-tounsprung mass ratios have been analysed using the models. The behaviour of the vehicle at a range of speeds and different obstacles has been simulated. The results show the predicted accelerations and vibration dose value (VDV) vary with both speed and sprung-to-unsprung mass ratio. The behaviour of the suspensions for the random ride and step impact conditions show that the ride quality and acceleration levels deteriorate with vehicle speed. For the pothole simulation, however, the higher unsprung mass conditions show an improvement in some aspects as speeds increase, because the wheel effectively 'skips over' the pothole and the resultant impact is reduced.
21 citations
Journal Article•
TL;DR: In this paper, a mathematical model is developed and simulated using Matlab and Simulink, which incorporates the compressibility of the fluid and expansion of other components using an effective bulk modulus and the damper valve characteristics.
Abstract: Battlefield mobility is one of the fundamental requirements of tracked military vehicles. The suspension provides the necessary ride, handling, and traction for the vehicle when traversing over either paved roads or on unprepared terrain. The Hydro-gas Suspension Unit (HSU) is one current state-of-the-art suspension technology with a huge potential for improvement in the future. In this work a mathematical model is developed and simulated using Matlab and Simulink. The model incorporates the compressibility of the fluid and expansion of other components using an effective bulk modulus and the damper valve characteristics. A novel method of modelling the flow through the damper valve using a lookup table is presented to overcome a problem with algebraic loops. Results from the model are discussed for different damper valve characteristics and input frequencies. The HSU model is incorporated into a simulation of a six-wheel station tracked vehicle having eight degrees of freedom, in order to study the ride quality of the vehicle and to propose a method for selecting the damper valve characteristics.
4 citations
Journal Article•
TL;DR: In this paper, the authors describe some of the simple rules which have to be observed when modelling vehicle operations on soil and present results from three case studies of scale-model tests on tracked vehicles and earth anchors carried out in soil bins at The Royal Military College of Science (RMCS) in the United Kingdom.
Abstract: Full-scale testing of vehicles is notoriously difficult and expensive. Invariably only a small range of vehicle configurations and soil conditions can be explored and it is difficult to ensure consistency and uniformity of terrain. Scale-model testing may provide a more versatile and cost-effective method for exploring the behaviour of off-road vehicles. This paper describes some of the simple rules which have to be observed when modelling vehicle operations on soil and presents results from three case studies of scale-model tests on tracked vehicles and earth anchors carried out in soil bins at The Royal Military College of Science (RMCS) in the United Kingdom. The results are shown to correlate well with theoretical predictions of full-scale performance and with empirical predictions based on full-scale trials.
3 citations