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 Evidence for Two Regions in the Mouse t Complex Controlling Transmission Ratios

1981 ◽  
Vol 38 (3) ◽  
pp. 315-325 ◽  
Author(s):  
Józefa Styrna ◽  
Jan Klein
Keyword(s):  
Lethal Factor ◽  
Compound Heterozygote ◽  
The Other ◽  
Transmission Ratio ◽  
Crossing Over ◽  
Normal Length ◽  
T Complex ◽  
Segregation Distorter ◽  
Haplotype A ◽  
Made In

SUMMARYFour new t haplotypes, tTu1 through tTu4, are described, three of them derived from the tw12tf haplotype and one (tTu4) from the tw2 haplotype. The tTu1 and tTu4 haplotypes cause taillessness in T/tTu1 or T/tTu4 heterozygotes, lack the lethality factor, weakly suppress recombination in the T−H−2 interval, and are transmitted to offspring from tTu/ + males at nearly Mendelian ratios. The tTu3 haplotype resembles tTu1 and tTu4 except for the fact that the T/tTu3 heterozygotes have normal-length tails. The tTu2 haplotype probably carries the lethal factor of tTu12tf, suppresses crossing-over in the T-H-2 and tf-H-2 intervals, and displays a slightly subnormal transmission ratio. In the compound heterozygote tTu1/tTu2, the male transmission ratio of the tTu1 chromosome is close to that of the original tTu12tf haplotype. A similar effect is observed in the tTu3/tTu2 heterozygote. This observation is interpreted as evidence for two regions within the t complex controlling the male transmission ratios. One of the regions is close to the tail-modifying region, the other is close to the lethality factor. Our findings parallel closely those made in the segregation distorter system in Drosophila.

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.

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.

A Theoretical Approach to the Shift Mechanics of Rubber Belt Variators

2008 ◽  
Vol 130 (12) ◽  
Author(s):  
Francesco Sorge
Keyword(s):  
Numerical Solutions ◽  
Control Volume ◽  
Mass Conservation ◽  
Theoretical Description ◽  
The Other ◽  
Control Surface ◽  
Speed Ratio ◽  
Rubber Belt ◽  
Total Mass Flux ◽  
Inertia Forces

This paper proposes a theoretical description of the mechanical behavior of rubber belt variators during the speed ratio shift. Comparing with the steady operation, the mass conservation of the belt is completely reformulated considering an elementary dihedral control volume between two planes through the pulley axis and balancing the inside mass variation with the total mass flux through the control surface. On the other hand, the belt equilibrium conditions are similar to the steady case, as the inertia forces due to the shifting motion are negligible with respect to the other forces. Assuming a one-dimensional belt model, it is shown that adhesive regions may appear inside the arc of contact, where the belt sticks to the pulley flanges along spiral-shaped paths. It is demonstrated that this type of contact may occur only for the closing pulleys, differently from the steady drives and from the opening pulleys, where only quasiadhesive internal subregions may be observed at most, where the sliding velocity turns out to be quite small along a more or less extended portion of the arc of contact. Numerical solutions are calculated for all types of conditions, and their characteristics are widely described.

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.

Sign in / Sign up

Export Citation Format

Share Document