• Title, Summary, Keyword: 무한궤도

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Fundamental Study on the Effect of Grousers on the Soil Thrust of Off-road Tracked Vehicles (그라우저 효과를 고려한 야지궤도차량의 지반추력 평가연구)

  • Baek, Sung-Ha;Chung, Choong-Ki
    • Journal of the Korean Geotechnical Society
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    • v.34 no.9
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    • pp.33-42
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    • 2018
  • When an off-road tracked vehicle travels, an engine thrust that is transmitted to the continuous track induces a shearing action on the soil-track interface. Consequently, the relative displacement known as slip displacement takes place on the soil-track interface, which develops an associated soil thrust acting as a traction force. For the loose or soft ground conditions, an excessively large slip displacement can be required for the development of the desired soil thrust which will make the tracked vehicle mobile and therefore the outer surface of the continuous track is generally designed to protrude with grousers. This paper fundamentally studied the effect of grousers on the soil thrust of off-road tracked vehicles. Based on the soil-track interaction theory, a new soil thrust assessment method that properly takes into account the effect of grousers was developed. Also, the soil thrust of off-road tracked vehicles equipped with a number of grousers was evaluated using the developed assessment method. The results showed that grousers increased the soil thrust of the continuous track, enhancing the overall tractive performance of off-road tracked vehicles. These effects were more obvious as the height of grouser increased and the spacing of grouser decreased; thus, it is concluded that the grouser which has smaller shape ratio (span of the grouser to a grouser height) significantly enhances off-road tracked vehicle's performance.

3D Dynamic Finite Element Analysis and Corresponding Vibration of Asphalt Track Considering Material Characteristics and Design Thickness of Asphalt Concrete Roadbed Under Moving Load (아스팔트 콘크리트 설계두께 및 재료특성을 반영한 아스팔트 콘크리트 궤도 3차원 이동하중 동적해석 및 진동특성)

  • Lee, SeongHyeok;Seo, HyunSu;Jung, WooYoung
    • Journal of the Korean Society for Railway
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    • v.19 no.1
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    • pp.67-76
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    • 2016
  • The asphalt-concrete trackbed system has many advantages in terms of maintenance and economics. However, methods to investigate practical use corresponding to the development of the trackbed system must be developed. The primary objective of this study was to evaluate the dynamic performance of the asphalt system in accordance with both the elastic and viscoelastic material characteristics and design thickness of the asphalt trackbed. More specifically, in order to reduce the uncertainty error of the Finite Element(FE) model, a three-dimensional full scale FE model was developed and then the infinite foundation model was considered. Finally, to compare the condition of viscoelastic materials, performance evaluation of the asphalt-concrete trackbed system was used to deal with the dynamic amplification factors; numerical results using isotropic-elastic materials in the FE analysis are presented.

A Study of Dynamic Analysis of a Tracked Vehicle for Mining on Deep-Sea Bed (심해저 무한궤도식 채광차량의 동적 해석에 관한 연구)

  • Han, Hyung-Seok;Hong, Sub
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.6
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    • pp.178-188
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    • 2003
  • A study on the dynamic analysis of a tracked vehicle for mining on deep-sea bed with very soft soil is presented. An equation for the interaction between track and soft soil is employed to develop a track/soil interaction module called TVAS. The vehicle is modeled as a multi-body dynamic system using a multi-body dynamic analysis program. The developed module is incorporated into the multi-body dynamic analysis program with a user subroutine. The dynamic behavior and design of the mining vehicle on deep-sea bed is investigated.

Analysis of Diagnosis Algorithm Implemented in TCU for High-Speed Tracked Vehicles (고속 무한궤도 차량용 변속제어기 진단 알고리즘 분석)

  • Jung, Gyuhong
    • Journal of Drive and Control
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    • v.15 no.4
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    • pp.30-38
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    • 2018
  • Electronic control units (ECUs) are currently popular, and have evolved further towards the high-end application of autonomous vehicles in the automotive industry. Such digital technologies have also become widespread, in agriculture and construction equipment. Likewise, transmission control of high-speed tracked vehicles is based on the transmission control unit (TCU), performing complex gear change control functions, and diagnostic algorithms (a TCU's self-diagnostic and reporting capability of malfunction data through CAN communication). Since all functions of TCU are implemented by embedded-software, it is hardly possible to analyze specifications by reverse engineering. In this paper a real-time transmission simulator adaptable to TCU is presented, for analysis of diagnosis algorithm and standards. Signal simulation circuits are deliberately designed considering electrical characteristics of TCU inputs and various analysis tools, such as analog input auto scan function, and global output enable switch, are implemented in software. Test results from hardware-in-the-loop simulator verify tolerance time for each error, as well as cause of fault, error reset conditions.

Performance Test of a Catapillar Track-Hydroturbine (무한궤도 수차의 성능시험)

  • Lee, Hyeon-Gu;Kim, Hyeon-Jin;Kim, Hyeon-Su
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.20 no.1
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    • pp.237-243
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    • 1996
  • Current low head and small scale hydroturbines have limitations in the minimum required head and flow rate for efficient operation. This study attempts to develop a new concept hydroturbine which is expected to run efficiently even in very low head and small flow rate, so that the limitations on the conventional small scale hydropower could be alleviated and competition with other alternative energy sources in the economic respect could be attained. A small scale catapillar track- hydroturbine was fabricated and the performance test was carried out in a water tunnel over the head range of H = 0.8 m ~ 1.26 m. The peak turbine efficiency was 41.3% at the speed ratio of 0.6, and the turbine loss was mostly due to the friction at the chain drive used for power transmission from the runner to the shafts. This type of turbine is expected to become competitive when some improvement in the power transmission mechanism is made.

Development of Transmission Simulator for High-Speed Tracked Vehicles (고속 무한궤도 차량용 변속기 시뮬레이터 개발)

  • Jung, Gyuhong
    • Journal of Drive and Control
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    • v.14 no.4
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    • pp.29-36
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    • 2017
  • Electronic control technologies that have long been developed for passenger cars spread to construction equipment and agricultural vehicles because of its outstanding performance achieved by embedded software. Especially, system program of transmission control unit (TCU) plays a crucial role for the superb shift quality, driving performance and fuel efficiency, etc. Since the control algorithm is embedded in software that is rarely analyzed, development of such a TCU cannot be conducted by conventional reverse engineering. Transmission simulator is a kind of electronic device that simulates the electric signals including driver operation command and output of various sensors installed in transmission. Standalone TCU can be run in normal operation mode with the signals provided by transmission simulator. In this research, transmission simulator for the tracked vehicle TCU is developed for the analysis of shift control algorithm from the experiments with standalone TCU. It was confirmed that shift experimental data for the simulator setup conditions can be used for the analysis of control algorithms on proportional solenoid valves and shift map.

A Study on the Driving Analysis of Tracked Robot (무한궤도 로봇의 주행 해석에 관한 연구)

  • Lee, Sang-Ho;Ko, Jin-Suk;Jung, Yeon-Ha;Shin, Hyun-Soo;Kim, Chang-Joon;Lee, Seoung-Yeol;Han, Chang-Soo
    • Proceedings of the KSME Conference
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    • pp.867-872
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    • 2007
  • A tracked robot has an excellent mobility on the rough terrain. Especially, a tracked robot for driving has to get structural function in the every field. In this paper, we propose a tracked robot of a small rear wheel typed. Also compared and estimated a driving analysis about the tracked robot in considered the general environment. Compared 2 models are different in size of rear wheels but front wheels are same size each other. From comparing model, the radius of front wheels is 100mm and the radius of rear wheels is 100mm. The radius of front wheels is 100mm and the radius of rear wheels is 70mm from proposed tracked robot. Depend on these radiuses of values we are known driving torque values of an actuating wheel using Recurdyn. And estimated stress of rotated track by an actuating wheel using Ansys. finally, the designed robot has size of $600mm\;{\times}\;330mm\;{\times}\;150mm$, weight is 27kg and the tracked robot is actuated by 2 geared DC motors.

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