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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Transactions of the Korean Society of Mechanical Engineers A
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Journal DOI :
The Korean Society of Mechanical Engineers
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Volume & Issues
Volume 25, Issue 12 - Dec 2001
Volume 25, Issue 11 - Nov 2001
Volume 25, Issue 10 - Oct 2001
Volume 25, Issue 9 - Sep 2001
Volume 25, Issue 8 - Aug 2001
Volume 25, Issue 7 - Jul 2001
Volume 25, Issue 6 - Jun 2001
Volume 25, Issue 5 - May 2001
Volume 25, Issue 4 - Apr 2001
Volume 25, Issue 3 - Mar 2001
Volume 25, Issue 2 - Feb 2001
Volume 25, Issue 1 - Jan 2001
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Design of Robust Motion Controllers with Internal-Loop Compensator
Kim, Bong-Geun ; Jeong, Wan-Gyun ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 10, 2001, Pages 1501~1513
DOI : 10.22634/KSME-A.2001.25.10.1501
Disturbance observer, adaptive robust control, and enhanced internal model control are model based disturbance attenuation methods famous for robust motion controller which can satisfy desired performance and robustness of high-speed/high-accuracy positioning systems. In this paper, these are shown to be the same scheme with different parameterizations. To do this, a generalized framework, called as RIC(robust internal-loop compensator) is proposed and the conventional schemes are analyzed in the RIC framework. Through this analysis, it can be shown that there are inherent similarities between the schemes and advantages of the RIC in the viewpoint of controller design. This is verified through simulations and experiments.
Design Analysis/Manufacturing /Performance Evaluation of Curved Unsymmetrical Piezoelectric Composite Actuator LIPCA
Gu, Nam-Seo ; Sin, Seok-Jun ; Park, Hun-Cheol ; Yun, Gwang-Jun ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 10, 2001, Pages 1514~1519
DOI : 10.22634/KSME-A.2001.25.10.1514
This paper is concerned with design, manufacturing and performance test of LIPCA ( Lightweight Piezo- composite Curved Actuator) using a top carbon fiber composite layer with near -zero CTE(coefficient of thermal expansion), a middle PZT ceramic wafer and a bottom glass/epoxy layer with high CTE. The main point of this design is to replace the heavy metal layers of THUNDER by thigh tweight fiber reinforced plastic layers without losing capabilities to generate high force and large displacement. It is possible to save weight up to about 30% if we replace the metallic backing material by the light fiber composite layer. We can also have design flexibility by selecting the fiber direction and the size of prepreg layers. In addition to the lightweight advantage and design flexibility, the proposed device can be manufactured without adhesive layers when we use epoxy resin prepreg system. Glass/epoxy prepregs, a ceramic wafer with electrode surfaces, and a graphite/epoxy prepreg were simply stacked and cured at an elevated temperature (177
after following an autoclave bagging process. It was found that the manufactured composite laminate device had a sufficient curvature after detached from a flat mold. The analysis method of the cure curvature of LIPCA using the classical lamination theory is presented. The predicted curvatures are fairly in agreement with the experimental ones. In order to investigate the merits of LIPCA, a performance test of both LIPCA and THUNDE
were conducted under the same boundary conditions. From the experimental actuation tests, it was observed that the developed actuator could generate larger actuation displacement than THUNDERT
The Shear and Friction Characteristics Analysis of End-Milling
Lee, Yeong-Mun ; Song, Tae-Seong ; Sim, Bo-Gyeong ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 10, 2001, Pages 1520~1527
DOI : 10.22634/KSME-A.2001.25.10.1520
In end milling process the undeformed chip thickness and the cutting force components vary periodically with phase change of the tool. In this study, up end milling process is transformed to the equivalent oblique cutting. The varying undeformed chip thickness and the cutting force components in end milling process are replaced with the equivalent average ones. Then it can be possible to analyze the chip-tool friction and shear process in the shear plane of the end milling process by the equivalent oblique cutting model. According to this analysis, when cutting SM45C steel, 72% of the total energy is consumed in the shear process and the balance is consumed in the friction process.
Crack Initiation Life Analysis in Notched Pipe Under Cyclic Bending Loads
Gwak, Sang-Rok ; Lee, Jun-Seong ; Kim, Yeong-Jin ; Park, Yun-Won ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 10, 2001, Pages 1528~1534
DOI : 10.22634/KSME-A.2001.25.10.1528
In order to improve Leak-Be(ore-Break methodology, more precisely the crack growth evaluation, a round robin analysis was proposed by the CEA Saclay. The aim of this analysis was to evaluate the crack initiation life, penetration life and shape of through wall crack under cyclic bending loads. The proposed round robin analysis is composed of three main topic; fatigue crack initiation, crack propagation and crack penetration. This paper deals with the first topic, crack initiation in a notched pipe under four point bending. Both elastic-plastic finite element analysis and Neuber's rule were used to estimate the crack initiation life and the finite element models were verified by mesh-refinement, stress distribution and global deflection. In elastic-plastic finite element analysis, crack initiation life was determined by strain amplitude at the notch tip and strain-life curve of the material. In the analytical method, Neuber's rule with the consideration of load history and mean stress effect, was used for the life estimation. The effect of notch tip radius, strain range, cyclic hardening rule were examined in this study. When these results were compared with the experimental ones, the global deformation was a good agreement but the crack initiation cycle was higher than the experimental result.
A Study on tole Improvement of the Slurry Dispersibility in CMP
Jo, Seong-Hwan ; Kim, Hyeong-Jae ; Kim, Ho-Yun ; Seo, Heon-Deok ; Kim, Gyeong-Jun ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 10, 2001, Pages 1535~1540
DOI : 10.22634/KSME-A.2001.25.10.1535
This study presents the possibility of scratch reduction on wafer in CMP by applying the ultrasonic and megasonic energy into the slurry which might contain large abrasive particles. Experiments were conducted to verify the dispersion ability of agglomerated particles by applying ultrasonic, megasonic waves and analyze the particle distribution of used slurry in case, of sonic energy assisted or none. And the dispersion stability of megasonic waves was investigated through the experiment of stability of the dispersed slurry, Finally, to confirm that the distribution of particles in slurry by ultrasonic waves was actually related to scratches on wafer when CMP was done, tungsten blanket wafer was processed, by CMP to compare and investigate scratches on wafer.
The Direct Extrusion of Copper Clad Aluminum Composite Materials by Using the Conical Dies
Yun, Yeo-Gwon ; Kim, Hui-Nam ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 10, 2001, Pages 1541~1550
DOI : 10.22634/KSME-A.2001.25.10.1541
This paper describes experimental investigations in the direct extrusion of copper clad aluminum rods through conical dies. Composite materials consist of two or more different material layers. Copper clad aluminum composite materials are being used fur economic and structural purposes and the development of an efficient production method of copper clad aluminum composite material rods by extrusion is very important, It is necessary to know the conditions in which successful uniform extrusion ,and sound cladding may be carried out without any defects in the direct extrusion. There are several variables that have an influence on determining a sound clad extrusion. In order to investigate the influence of these parameters on the hot direct extrudability of the copper clad aluminum composite material rods, the experimental study have been performed with various extrusion temperatures, extrusion ratios and semi-cone angles of die. Subsequently, the microscopic inspection of interface bonding is carried out for extruded products. By measuring hardness, along extrusion way of products, a variation of hardness has been discussed. Proportional flow state has been considered by measuring radius ratio of Cu sleeve and Al core before and after extrusion.
Development of Fiber Optic Accelerometer for Third-Party Damage Detection
Park, Ho-Rim ; Choe, Jae-Bung ; Kim, Yeong-Jin ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 10, 2001, Pages 1551~1558
DOI : 10.22634/KSME-A.2001.25.10.1551
Recently, a number of underground pipelines have been drastically increased. The integrity of these buried pipelines, especially gas transmitting pipelines, is of importance due to an explosive characteristic of natural gas. The third party damage is known as one of the most critical factor which causes fatal accidents. For this reason, a number of systems detecting third party damage are under development. The major concern in the development of third party damage detection system is to transmit vibration signals out of accelerometer to signal conditioner and data acquisition system without any interference caused by noise. The objective of this paper is to develope a fiber optic accelerometer applicable to third party damage detection system. A fiber optic accelerometer was developed by use of combining principles of one degree of freedom vibration model and an extrinsic Fabry-Perot interferometer. The developed fiber optic accelerometer was designed to perform with a sensitivity of 0.06mVg, a frequency range of less than 6kHz and an amplitude range of -200g to 200g. The developed, accelerometer was compared with a piezoelectric accelerometer and calibrated. In order to verify the developed accelerometer, the field experiment was performed. From the field experiment, vibration signals and the location of impact were successfully detected. The developed accelerometer is expected to be used for the third party damage detection system which requires long distance transmission of signals.
Exact Solutions for Bending-Torsion Coupled Vibration of Composite Timoshenko Beam
Hong, Seong-Uk ; Gang, Byeong-Sik ; Park, Jung-Yun ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 10, 2001, Pages 1559~1566
DOI : 10.22634/KSME-A.2001.25.10.1559
This paper proposes a dynamic analysis method for obtaining exact solutions of composite Timoshenko beams, which are inherently subjected to both the bending , and torsional vibrations. In this paper, the bending-torsion coupled vibration of composite Timoshenko beam is rigorously modelled and analyzed. Two numerical examples are provided to validate and illustrate the bending-torsion coupled vibration of composite Timoshenko beam structure. The numerical examples prove that the proposed method is of great use for the dynamic analysis of dynamic structures composed of multiply connected composite Timoshenko beams.
Evaluation of Pressure-Temperature Limit Curve for the Safe Operation of an RFV based on 3-D Finite Element Analyses
Lee, Taek-Jin ; Park, Yun-Won ; Lee, Jin-Ho ; Choe, Jae-Bung ; Kim, Yeong-Jin ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 10, 2001, Pages 1567~1574
DOI : 10.22634/KSME-A.2001.25.10.1567
In order to operate an RPV safely it is necessary to keep the pressure-temperature (P-T) limit during the heatup and cooldown process. While the ASME Code provides the P-T limit curve for safe operation, this limit curve has been prepared under conservative assumptions In this paper the effects of conservative assumptions involved in the P-T limit curve specified in the ASME Code Sec. XI were investigated. Three different parameters the crack depth the cladding thickness and the cooling rate, were reviewed based on 3-D finite element analyses. Also the constraint effect on P-T limit curve generation was investigated based on J- T approach. It was shown that the crack depth and the constraint effect change the safe region in P-T limit curve significantly Therefore it is recommended to prepare a more precise P-T limit curve based on finite element analysis to obtain P-T limit for safe operation of an RPV.
Design of Gate Location in Injection Molding of a Dashboard Using Dummy Runner
Han, Gyeong-Hui ; Choe, Du-Sun ; Kim, Hong-Seok ; Im, Yong-Taek ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 10, 2001, Pages 1575~1582
DOI : 10.22634/KSME-A.2001.25.10.1575
Injection molding is widely used in producing various plastic parts due to its high productivity, and the demand for injection molded products with high precision is increasing. To achieve successful product quality and precision, the design of gating and runner system in injection mold is very important because it influences the melt flow into the cavity. Some deflects, such as weld lines and overpacking, can be effectively controlled with proper selection of gate locations. In the present study, the design of gate locations in injection molding of a dashboard fur automobiles was carried out with CAMP mold, a PC-based simulation system for injection molding. A dummy runner system was developed to simulate a runner system in order to increase the efficiency of the analysis procedure. The numbers and locations of gates were iteratively determined in the present investigation. In this procedure, an acceptable design was obtained in terms of reducing the maximum pressure and clamping force.
Fatigue Strength Characteristic of Metal Matrix Composite Material in
Park, Won-Jo ; Lee, Kwang-Young ; Huh, Sun-Chul ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 10, 2001, Pages 1583~1589
DOI : 10.22634/KSME-A.2001.25.10.1583
Metal matrix composites with whisker reinforcements have significant potentials for demanding mechanical applications including defense, aerospace, and automotive industries. Especially metal matrix composites, which are reinforced with aluminum borate whisker, have been used leer the part of piston head in automobile because of good specific strength and wear resistance. In this study, AC4CH-based metal matrix composites with
reinforcement have been produced using squeeze casting method, after T6 heat treatment, we evaluated fatigue life property of matrix and MMC composite and investigated fracture mechanism.m.
Effect of the Peening Intensity by Shot Peening
Jeong, Seong-Gyun ; Lee, Seung-Ho ; Jeong, Seok-Ju ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 10, 2001, Pages 1590~1596
DOI : 10.22634/KSME-A.2001.25.10.1590
The shot peening process is most often used to improve fatigue properties of metal parts. The single most critical parameter of the shot peening process is the shot ball itself. Without the correct quality media, all other shut peening parameters are extraneous and the desired fatigue improvement and consistency of improvement will not be achieved. Shot peening involves modifications of the surface and subsurface condition of a material that can be described by the change of the residual stresses, the hardness, and the surface roughness. This Paper Presents the shot peening to optimize the shot ball parameters. The effect of shot peening parameter on the surface roughness, surface hardness and residual stress are investigated.
Enhancement of Computational Efficiency of Reliability Optimization Method by Approximate Evaluation of Sub-Optimization Problem
Jeong, Do-Hyeon ; Lee, Byeong-Chae ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 10, 2001, Pages 1597~1604
DOI : 10.22634/KSME-A.2001.25.10.1597
Alternative computational scheme is presented fur reliability based optimal design using a modified advanced first order second moment (AFOSH) method. Both design variables and design parameters are considered as random variables about their nominal values. Each probability constraint is transformed into a sub -optimization problem and then is resolved with the modified Hasofer- Lind-Rackwitz-Fiessler (HL-RF) method for computational efficiency and convergence. A method of design sensitivity analysis for probability constraint is presented and tested through simple examples. The suggested method is examined by solving several examples and the results are compared with those of other methods.
Least-Squares Meshfree Method and Integration Error
Park, Sang-Hun ; Yun, Seong-Gi ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 10, 2001, Pages 1605~1612
DOI : 10.22634/KSME-A.2001.25.10.1605
Least-squares meshfree method is presented. Conventional meshfree methods based on the Galerkin formulation suffer from inaccurate numerical integration. Least-squares formulation exhibits rather different integration-related characteristics. It is demonstrated through numerical examples that least-squares formulation is much more robust to integration errors than the Galerkin's. Therefore efficient meshfree methods can be devised by combining very simple integration algorithms and least-squares formulation.
Topology Optimization of a Structure under Harmonic Excitation caused by Magnetic Fields
Yu, Jeong-Hun ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 10, 2001, Pages 1613~1620
DOI : 10.22634/KSME-A.2001.25.10.1613
This study is focused on the application of the homogenization design method (HDM) to reduce the vibration level of a structure excited by magnetic harmonic farces. This is accomplished by obtaining the optimal material distribution in a design domain to minimize the frequency response caused by the magnetic harmonic excitation. The Maxwell stress method is used to compute the magnetic force and the HDM is applied leer the optimization. The developed method is applied to a simple pole model that is excited by the harmonic bending farce caused by the current around an adjacent stator. Results shows that the HDM is valid to minimize the frequency response.
Development of an Optimization Algorithm Using Orthogonal Arrays in Discrete Design Space
Lee, Jeong-Uk ; Park, Jun-Seong ; Lee, Gwon-Hui ; Park, Gyeong-Jin ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 10, 2001, Pages 1621~1626
DOI : 10.22634/KSME-A.2001.25.10.1621
The structural optimization have been carried out in the continuous design space or in the discrete design space. Methods fur discrete variables such as genetic algorithms , are extremely expensive in computational cost. In this research, an iterative optimization algorithm using orthogonal arrays is developed for design in discrete space. An orthogonal array is selected on a discrete des inn space and levels are selected from candidate values. Matrix experiments with the orthogonal array are conducted. New results of matrix experiments are obtained with penalty functions leer constraints. A new design is determined from analysis of means(ANOM). An orthogonal array is defined around the new values and matrix experiments are conducted. The final optimum design is found from iterative process. The suggested algorithm has been applied to various problems such as truss and frame type structures. The results are compared with those from a genetic algorithm and discussed.
Construction and Applications of the Virtual Automotive Plant for a Victual Manufacturing
No, Sang-Do ; Lee, Gyo-Il ; Son, Chang-Yeong ; Han, Hyeong-Sang ; Park, Yeong-Jin ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 10, 2001, Pages 1627~1635
DOI : 10.22634/KSME-A.2001.25.10.1627
Virtual manufacturing is a technology facilitating effective development and agile manufacturing of products via sophisticated computer models representing physical and logical schema and behavior of real manufacturing systems including manufacturing resources, environments, and products. For the successful application of this technology, a virtual plant as a well-designed and integrated environment is essential fur sharing information and engineering collaboration among diverse engineering activities. The systematic approaches and effective methods for construction and application of a virtual plant are proposed in this paper, such as a 3-D CAD modeling, cell and line simulations, databases and some information technologies. Measuring and 3-D CAD modeling technologies of many equipments, facilities and structures of the building are developed, and effective information management system managing CAD models, related files and data is implemented in WWW environments. Finally, precise simulations of unit cell lines and the whole plant are performed. For the beginning of implementing a Virtual Automotive Plant, the Virtual Plant fur the Body Shop of a Korean automotive company is constructed and implemented. We could obtain the benefit of savings in time and cost in many manufacturing preparation activities in the new car development processes.
Optimal Design of Tire Sidewall Contours for Improving Maneuverability and Durability
Jo, Jin-Rae ; Jeong, Hyeon-Seong ; Lee, Hong-U ; Kim, Nam-Jeon ; Kim, Gi-Un ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 10, 2001, Pages 1636~1643
DOI : 10.22634/KSME-A.2001.25.10.1636
Automobile maneuverability and tire durability are significantly influenced by the sidewall tire contour. In order to improve these tire performances, it is very important far one to determine a sidewall contour producing the ideal tension and strain-energy distributions. However, these requirements can nut be simultaneously achieved by conventional non-interactive multi-objective optimization methods based on mathematical programming, because these exhibit the conflicting behavior each other, with respect lo the sidewall contour. Therefore, we execute the tire contour optimization fur improving the maneuverability and the tire durability using satisficing trade-off method.
The Evaluation of Mechanical Properties and Fatigue Life for Domestic 304 Stainless Steel Used as Membrane Material in LNG Storage Tank
Kim, Hyeong-Sik ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 10, 2001, Pages 1644~1650
DOI : 10.22634/KSME-A.2001.25.10.1644
Mechanical properties of domestic 374 stainless steel have been evaluated fur membrane material used in LNG storage tank. LNG tank is operated around -162
. The temperature of membrane depends on LNG level. Accordingly, the membrane material is deteriorated by variation of liquid pressure and temperature. Tensile test and fatigue life test were performed at room temperature and -l62
per code requirements. Especially the biaxial fatigue life test was conducted with shaped membrane sheet at a thermal strain of
The test results obtained with the domestic 304 stainless steel showed better properties compared to the values required by code.
Reliability Analysis in Fatigue Strength of Connecting Rod
Kim, Cheol-Su ; Lee, Jun-Hyeong ; Kim, Jeong-Gyu ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 10, 2001, Pages 1651~1658
DOI : 10.22634/KSME-A.2001.25.10.1651
It is necessary to evaluate fatigue strength and reliability of the connecting rod which is core part in automotive engine to assure the high level of durability of automobile. For this purpose, the loading conditions in automotive engine is obtained by the dynamic analysis. Based on these results, the critical section was identified by the finite element analysis. The fatigue strength under constant amplitude was evaluated and the mean of the fatigue limit at R = -2.27 derived from the staircase method was 311.2MPa. And the failure probability( F
p/ ) derived from the strength-stress interference model is 0.0003% at the 99.99% confidence level and the mean factor of safety was 4.2.
Stress Intensity Factor Analysis of Elliptical Arc Through Cracks at Mechanical Fastener Holes by Weight Function Method ( I ) - Development of Weight Function Method -
Heo, Seong-Pil ; Yang, Won-Ho ; Hyeon, Cheol-Seung ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 10, 2001, Pages 1659~1670
DOI : 10.22634/KSME-A.2001.25.10.1659
It has been reported that cracks at mechanical fastener holes usually nucleate as elliptical corner cracks at the faying surface of the mechanical joints and grow as elliptical arc through cracks after penetrating the opposite surface. The weight function method is an efficient technique to calculate the stress intensity factors fur elliptical cracks using uncracked stress field. In this study the weight function method for three dimensional mixed-mode problem applied to elliptical comer cracks Is modified for elliptical arc through cracks and the stress intensity factors at two surface points of elliptical arc through cracks at mechanical fastener holes are analyzed by the weight function method. This study consists of two parts and in part I , the weight function method for elliptical arc through cracks is developed and verified.
Stress Intensity Factor Analysis of Elliptical Arc Through Cracks at Mechanical Fastener Holes by Weight Function Method (II) - Mixed-Mode Stress Intensity Factor Analysis -
Heo, Seong-Pil ; Yang, Won-Ho ; Ryu, Myeong-Hae ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 10, 2001, Pages 1671~1677
DOI : 10.22634/KSME-A.2001.25.10.1671
Cracks at mechanical fastener holes usually nucleate as elliptical comer cracks at the faying surface of the mechanical joints and grow as elliptical arc through cracks. The weight function method for elliptical arc through cracks at mechanical fastener holes has been developed and verified in the part I of this study. In part H, applying the weight function method, the effects of the amount of clearance on the mixed-mode stress intensity (actors are investigated and the change of crack shape is predicted from the analysis for various crack shapes. The stress intensity factors leer inclined crack are analyzed and critical angle at which mode I stress intensity factor becomes maximum is determined.
Development of a Dynamic Track Tensioning System in Tracked Vehicles
Seo, Mun-Seok ; Heo, Geon-Su ; Hong, Dae-Geon ; Lee, Chun-Ho ; Choe, Pil-Hwan ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 10, 2001, Pages 1678~1683
DOI : 10.22634/KSME-A.2001.25.10.1678
The mobility of tracked vehicles is mainly influenced by the interaction between tracks and soil, so that the characteristics of their interactions are quite important fur the tracked vehicle study. In particular, 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 road-wheels, the Dynamic Track Tensioning System (DTTS) which maintains the optimum track tension throughout the maneuver is required. It consists of track tension monitoring system, track tension controller and hydraulic system. In this paper, a dynamic track tensioning system is developed for tracked vehicles which are subject to various maneuvering tasks. The track tension is estimated based on the idler assembly model. Using the monitored track tension and con sidering the highly nonlinear hydraulic units, fuzzy logic controllers are designed in order to control the track tension. The track tensioning performance of the proposed DTTS is verified through the simulation of the Multi -body Dynamics tool.