Vibration Qualification of Commercial Computers for Use in Military Tactical Environments

1995 ◽  
Vol 38 (4) ◽  
pp. 18-22
Author(s):  
John Dente ◽  
James McCutcheon ◽  
Ashok Jain
Keyword(s):  
Vibration Test ◽  
Tracked Vehicle ◽  
Tracked Vehicles ◽  
Vibration Isolators ◽  
Commercial Use ◽  
Test Profiles

Commercial computers are generally designed for commercial use and lack industry specification for tactical use, other than the shipping environment. In order to use commercial computers in rugged military tactical environments, appropriate mounting trays and fixtures with vibration isolators must be designed for installation in tactical wheeled and tracked vehicles. This paper describes the vibration test profiles used in testing a commercial computer and monitor, as isolated, to determine the survivability limitations of these components when subjected to simulated tactical wheeled and tracked vehicle vibration environments.

Design and Analysis of Steering Mechanism for Small Tracked Vehicle

2014 ◽  
Vol 701-702 ◽  
pp. 659-665
Author(s):  
Fa Liang Zhou ◽  
Xiao Jun Xu ◽  
Hao Yue Zhang
Keyword(s):  
The Other ◽  
Transmission Ratio ◽  
Tracked Vehicle ◽  
Tracked Vehicles ◽  
Steering Mechanism ◽  
Rubber Belt

The steering mechanism of tracked vehicles is complicated and large, which is an obstacle for its miniaturization. According to the theory of rubber-belt CVTs, a new kind of steering mechanism for small Tracked vehicle is designed. The mechanism consists of two symmetrical-layout rubber-belt CVTs. A sliding part for steering is designed, which can slide axially to make the transmission ratio of one transmission increase while the other reduces, so that the tracked vehicle turns. The steering motion is calculated and its motion discipline is founded. The steering sensitivity and steering smoothness are analyzed, and its steering performance is evaluated.

scholarly journals A steering model for articulated tracked vehicle considering soil deformation on track–soil interaction

2018 ◽  
Vol 10 (10) ◽  
pp. 168781401880270 ◽  
Author(s):  
Yu Yao ◽  
Kai Cheng ◽  
Bangcheng Zhang ◽  
Jinhua Lin ◽  
Dawei Jiang ◽  
...  
Keyword(s):  
Experimental Results ◽  
Simulation Studies ◽  
Soil Deformation ◽  
Tracked Vehicle ◽  
Tracked Vehicles ◽  
Model Based ◽  
Theoretical Results ◽  
Strong Agreement

With the advantage of steering performance, articulated tracked vehicles have excellent mobility in off-road application. However, in current models for steering performance, soil deformation on the interaction between track and soil cannot always be taken into account. Therefore, steering performance cannot always be calculated accurately. In order to solve the problem, it is essential to propose a steering model which can take the effect of soil deformation on track–soil interaction into consideration. In this article, a steering model of articulated tracked vehicle is proposed on track–soil interaction. Moreover, in order to improve steering performance, a track–soil sub-model is developed that can consider soil deformation on track–soil interaction. Using this steering model based on track–soil sub-model, steering performance can be calculated more accurately. Simulation studies and experimental results are in strong agreement with the theoretical results in this article. The results show that equipped with the track–soil sub-model, the proposed steering model can be used to accurately predict steering performance. The steering model of articulated tracked vehicle proposed in this article can provide a basis for other similar vehicles.

scholarly journals The influence law of grouser shape on soil slide sinkage when tracked vehicle travels on soft road

2019 ◽  
Vol 234 (1) ◽  
pp. 225-237
Author(s):  
Jian He ◽  
Dalin Wu ◽  
Jisheng Ma ◽  
Hongkai Wang ◽  
Yuliang Yang
Keyword(s):  
Numerical Simulation ◽  
System Dynamics ◽  
Simulation Model ◽  
Multibody System ◽  
Multibody System Dynamics ◽  
Shear Displacement ◽  
Soil Parameters ◽  
Tracked Vehicle ◽  
Physical Test ◽  
Tracked Vehicles

The influence law of a tracked vehicle grouser shape on the soil slide sinkage was investigated in this study via the numerical simulations and physical tests. A finite element model was built using the plastic incremental theory and generalized Hokker’s law, while constitutive soil parameters were obtained via triaxial test. The numerical simulation model was verified by physical test results. Based on the verified numerical simulation model, the influence law of the tracked vehicle grouser shape on the soil slide sinkage was determined. The results show that (1) shear displacement in the lateral direction can increase the soil sinkage in the vertical direction, which is referred to as the “slide sinkage”; (2) there is a linear relationship between the slide sinkage and the shear displacement; (3) the grouser width and height have a positive influence on the amount of slide sinkage. Under the same load, an increase in grouser width and height will cause an increase in the soil slide sinkage. Grouser thickness and pitch have a negative influence on the slide sinkage, and under the same load, increased grouser width and height cause a reduction in the soil slide sinkage. Grouser angle characteristics have no significant effect on the soil sinkage. The application of the slide sinkage in tracked vehicles traveling on soft roads was investigated in multibody system dynamics analysis software Recurdyn to confirm these observations. The results presented in this paper may provide a workable reference for the analysis of tracked vehicles in multibody system dynamics scenarios.

THE HIGH-SPEED MILITARY TRACKED VEHICLE MAINTENACE SYSTEM - MODIFICATION IS NEEDED

2010 ◽  
Vol 158 (4) ◽  
pp. 71-83
Author(s):  
Adam DRYHUSZ ◽  
Kazimierz KOWALSKI
Keyword(s):  
Statistical Analysis ◽  
Management System ◽  
High Speed ◽  
Maintenance Management ◽  
Tracked Vehicle ◽  
Tracked Vehicles ◽  
Maintenance Activity ◽  
Maintenance System ◽  
Original Interpretation

The maintenance system of high-speed military tracked vehicles and the graphic original interpretation of maintenance activity (mainly maintenance) are described. A modification of the maintenance system of the above-mentioned vehicles based on dependability-oriented maintenance (Reliability Cantered Maintenance – RCM) is proposed. Additionally, the use of the statistical analysis of maintenance cases and the development of Computerised Maintenance Management System – CMMC are proposed as well.

Influence of Flexible Bodies in Military Tracked Vehicle Dynamics

2016 ◽  
Vol 8 (2) ◽  
Author(s):  
S. Jothi ◽  
V. Balamurugan ◽  
K.M. Mohan
Keyword(s):  
Dynamic Simulation ◽  
Rigid Bodies ◽  
The Finite Element Method ◽  
Tracked Vehicle ◽  
Finite Element Method Result ◽  
Flexible Bodies ◽  
Tracked Vehicles ◽  
Dynamic Studies ◽  
The Military ◽  
Test Result

Tracked vehicles are meant to be used in the harsh cross country environment. In particular, the military tracked vehicles are highly exposed to severe terrains and critical handling conditions. Yet while carrying out the dynamic studies, the tracked vehicles, in general, are modeled as rigid bodies. Hence in this article, an attempt has been made to understand closely the dynamics of a tracked vehicle with the inclusion of some parts of the tracked vehicle viz., hull side plates and road wheel arms, as flexible bodies in the dynamic analysis using the finite element method. Result of the flexible dynamic simulation is also compared with the tracked vehicle analysis with the same parts modeled as rigid bodies. In this investigation, dimensions of the standard staggered trapezoidal blocks terrain meant for testing the tracked vehicles is used to carry out the dynamic studies on the tracked vehicle. The dynamic simulation result of the flexible tracked vehicle model is also compared with the experimental test result of the actual tracked vehicle conducted in the actual trapezoidal blocks terrain.

Terrain-Adaptive Auxiliary Track Tensioning System for Tracked Vehicles

2013 ◽  
Vol 8 (3) ◽  
Author(s):  
Jaroslav Matej
Keyword(s):  
Genetic Algorithm ◽  
Multibody Dynamics ◽  
Dynamics Simulation ◽  
Optimal Parameters ◽  
Vehicle Model ◽  
Tracked Vehicle ◽  
Tracked Vehicles ◽  
The Road ◽  
Java Language ◽  
Genetic Algorithm Method

It is known that tension in the track of a tracked vehicle has a large effect on its driving properties. Simple track tensioning solutions, like track adjusting link assembly, use a one-road wheel motion to govern the motion of a track tensioning element. Thus the track tensioning force is a function of a terrain micro-profile. A logical improvement of this approach is to use all of the road wheels to govern the motion of the track tensioning element. This can be achieved by an auxiliary track tensioning system. This paper analyzes the conceptual track tensioning system governed by a terrain micro-profile. The motion of the track tensioning element is designed as a function of all of the road wheels' motions. A genetic algorithm method, implemented in Java language, is used to find the optimal parameters of the tensioning system and the results are verified via multibody dynamics simulation using the MSC.ADAMS/View system. The paper answers the question of whether the use of all of the road wheels' motions to govern the motion of the track tensioning element can be useful or not. The results indicate that the use of the auxiliary system can decrease the variance of the track tensioning force, in comparison with the track tensioning system without auxiliary tensioning. This means that the value of the track tensioning force is closer to its desired, predefined, and constant value during the whole simulation. The tracked vehicle model that is used is a simplified one and it is intended as a base for specific designs of track tensioning systems with auxiliary tensioning. The results suggest that the system can be used to improve the driving properties of tracked vehicles or robots.

scholarly journals Investigation of the components of the cornering resistance of a tracked vehicle on a solid support base

2021 ◽  
Vol 1 (2) ◽  
pp. 51-62
Author(s):  
B.V. Padalkin ◽  
Keyword(s):  
Mathematical Model ◽  
Reaction Force ◽  
Vertical Axis ◽  
Support Surface ◽  
Tracked Vehicle ◽  
Tracked Vehicles ◽  
Contact Patch ◽  
Minimum Number ◽  
The Moment ◽  
Propulsion Unit

The purpose of the study is to increase the completeness and reliability of approaches to deter-mining the components of the cornering resistance a tracked vehicle, as well as to create a method for their assessment, which will be suitable for practical calculations. The article analyzes two components of the moment of cornering resistance of the tracked vehi-cle, which can be distinguished if we consider the interaction of the caterpillar with the support base through separate contact spots (active sections of the tracks located under the road wheels). The first component arises from the linear movement of the active sections of the tracks. The second is caused by the rotational movement of the contact patch about the vertical axis. The paper presents a mathematical model of the interaction of the propeller and a dense support base, which makes it possible to study the dependence of the components of the moment of corner-ing resistance on the geometric parameters of the undercarriage of a tracked vehicle. The horizontal reaction force in this case is presented as a function of the slip coefficient. The possibility of realiz-ing various adhesion qualities of the propulsion unit in the longitudinal and transverse directions of sliding is provided. The model assumes a preliminary division of the contact patch into a finite number of elementary areas. Since the number of elementary sites affects the result, the article con-ducted a study to determine the minimum number of sites to ensure acceptable accuracy. An analysis of the expressions available in the literature was carried out to determine the speci-fied component of the cornering resistance. The new empirical relationships that better agree with the mathematical model were proposed. The study of several existing tracked vehicles, differing in the mass and size of the track support surface, made it possible to conclude that it is advisable to take into account the moment of cornering resistance of the contact patch for various types of tracked vehicles.

scholarly journals Increasing Mobility of Tracked Vehicles during Curvilinear Motion by Redistributing Power Flows

2021 ◽  
Vol 346 ◽  
pp. 03099
Author(s):  
I.A. Taratorkin ◽  
M.V. Vyaznikov ◽  
A.M. Vyaznikov
Keyword(s):  
High Speed ◽  
Electric Motors ◽  
Tracked Vehicle ◽  
Tracked Vehicles ◽  
Curvilinear Motion ◽  
Turning Mechanism ◽  
Kinematic Diagram

A kinematic diagram of an electromechanical transmission of a high-speed tracked vehicle with two traction electric motors, on-board gearboxes and a ZK-type differential turning mechanism, which makes it possible to effectively distribute power flows between the sides during curvilinear motion, is proposed.

scholarly journals Research on Characteristics of Tracked Vehicle Steering on Slope

2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
Yu Zhang ◽  
Mianhao Qiu ◽  
Xixia Liu ◽  
Jun Li ◽  
Haijun Song ◽  
...  
Keyword(s):  
Shear Stress ◽  
Slip Rate ◽  
Technical Support ◽  
Structure Parameters ◽  
Special Design ◽  
Tracked Vehicle ◽  
Tracked Vehicles ◽  
Dynamic Steering ◽  
Design And Optimization ◽  
Vehicle Structure

A special design is needed for an unmanned tracked vehicle (UTV) to meet the requirements of off-road environments and complex tasks. A loose surface is the main terrain for tracked vehicles in off-road driving. Slope steering is inevitable while driving in such conditions; hence, its performance is a major concern for tracked vehicles on loose terrain. This study investigates the slope steering performance of a tracked vehicle. An improved dynamic steering model is proposed when considering the shear stress-shear displacement relation of soil at the track-ground interface. The influence of ground characteristics on the slope steering performance of a tracked vehicle is illustrated. The track slip rate is adopted as an index to evaluate the influence of typical vehicle structure parameters on the slope steering performance of a tracked vehicle. This study provides technical support for the design and optimization of UTV.

scholarly journals Robust control of hydraulic tracked vehicle drive system based on quantitative feedback theory

2020 ◽  
Vol 16 (2) ◽  
pp. 155014772090783
Author(s):  
Chenhui Zhu ◽  
Hongmei Zhang ◽  
Wanzhang Wang ◽  
Kang Li ◽  
Wanru Liu
Keyword(s):  
Robust Control ◽  
Control Method ◽  
Structural Characteristics ◽  
Drive System ◽  
Quantitative Feedback Theory ◽  
Hydraulic Motor ◽  
Servo Drive ◽  
Tracked Vehicle ◽  
Tracked Vehicles ◽  
High Clearance

To improve the control precision of the drive system of hydraulic tracked vehicles, we established a mathematical model of the drive system based on the analysis of structural characteristics of the high-clearance hydraulic tracked vehicles and the dual-pump dual-motor drive system and developed a control strategy based on the quantitative feedback theory. First, the mutual independence of the two motor channels was achieved through channel decoupling. Then, the loop-shaping controller and the pre-filter were designed for the two channels. The result of a simulation experiment indicates that the proposed control method is very effective in suppressing external uncertainties and smoothening the speed-switching process of the hydraulic motor. Finally, an hydraulic tracked vehicle steering experimental test was carried out. The results show that under two different steering modes, the maximum standard deviation of the output speeds of the inner and outer motors of the hydraulic tracked vehicle is only 0.42, which meets the performance requirement on the hydraulic motor speed. The average steering track radii of the geometric centers of the inner and outer tracks are 1.828 and 0.033 m, respectively, and the relative errors are 1.56% and 3.19%, respectively. This demonstrates that the proposed control method achieves satisfactory results in the robust control of the hydraulic tracked vehicle drive system. It provides some references for the future control research of the hydraulic servo drive system of the high-clearance hydraulic tracked vehicles.

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