• Title/Summary/Keyword: 차량전복

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Design of a Robust Controller for Vehicle Rollover Prevention (차량 전복 방지를 위한 강인 제어기 설계)

  • Yim, Seong-Jin;Kim, Yong-Moo;Oh, Dong-Ho
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.36 no.11
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    • pp.1311-1318
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    • 2012
  • Vehicle systems are frequently exposed to parameter uncertainties such as vehicle speed and height of center of gravity. If a controller is designed to be robust against these parameter uncertainties, the rollover prevention capability can be considerably enhanced. In this study, robust controllers $H_2$ and $H_{\infty}$ are designed by using LMI for vehicle rollover prevention control in the discrete time domain. Some simulations using CarSim, a reliable simulation tool, are performed to validate the proposed controllers.

Simulation of Rollover Crashes and Passenger Injury Assessment for a Wheeled Armored Vehicle (차륜형 전투차량 전복 시 승무원 안전성 확보를 위한 시뮬레이션 연구)

  • Lee, Gyung-Soo;Jung, Ui-Jin;Park, Gyung-Jin
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.38 no.4
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    • pp.385-391
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    • 2014
  • A wheeled armored vehicle is a military vehicle that has been developed to enhance combat capabilities and mobility for the army. The wheeled armored vehicle has a high center of gravity, and it operates on unpaved and sloped roads. Therefore, this vehicle has a high risk of rollover crashes. To design the interior of the military vehicle, the crew's safety during rollover crashes is an important factor. However, actual vehicle tests for design are extremely expensive. In this paper, nonlinear dynamic analysis is performed to simulate the rollover crashes and the passenger injury is assessed for a wheeled armored vehicle. The scope of this research is the rollover condition, FE modeling of the wheeled armored vehicle and the dummy, arrangement of dummies, assessment of passenger injuries, and simulation model for rollover crashes.

Theoretical Analysis on Turnover Safety of Train Affected by Wind Pressure (풍압을 받는 철도 차량 전복 안전에 관한 이론 해석)

  • Nam, Seong-Won
    • Proceedings of the KSR Conference
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    • 2011.05a
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    • pp.812-817
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    • 2011
  • Rolling stocks are often subjected to the effects of natural cross wind or train wind pressure due to the crossing train. These wind pressure cause the falling-off in running stability and turnover problem. It is sometimes reported that trains are blown over by a gust of wind in overseas. So, many countries enact regulations to secure the safety for wind speed. In this study, we analyzed the difference between the regulation for turnover safety of train which was enacted by Ministry of Land. Transport and Maritime Affairs and that based on the multi-body model. In case of multi-body model, it is assumed that the degrees of freedom for carbody and bogie are assigned an independent values respectively. The results show that the latter approach based on multi-body model can access the safety of turnover and replace the computational method which is accessing with lateral force, derailment coefficient and decrement of wheel load.

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Unified Chassis Control to Prevent Vehicle Rollover (차량전복 방지를 위한 통합섀시제어)

  • Yoon, Jang-Yeol;Yi, Kyoung-Su;Cho, Wan-Ki;Kim, Dong-Shin
    • Proceedings of the KSME Conference
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    • 2007.05a
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    • pp.1132-1137
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    • 2007
  • This paper describes a Unified Chassis Control (UCC) strategy to prevent vehicle rollover by integrating individual modular chassis control systems such as Electronic Stability Control (ESC) and Continuous Damping Control (CDC). The UCC threshold is determined from a rollover index computed by estimated roll angle, roll rate and measured lateral acceleration. A direct yaw moment control method is used to design the ESC based on a 2-D bicycle model. Similarly, the CDC is designed based on a 2-D roll model using a direct roll moment control method. The performance of the proposed UCC scheme is investigated and compared to that of modular chassis controllers through computer simulations using a validated vehicle simulator. It is shown that the proposed the UCC can lead to improvements in vehicle stability and efficient actuation of chassis control systems.

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Theoretical Analysis on Overturn Safety of Train affected by Wind Pressure (풍압력을 받는 철도차량의 전복 안전에 관한 이론 해석)

  • Nam, Seong-Won
    • Journal of the Korean Society for Railway
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    • v.15 no.6
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    • pp.537-542
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    • 2012
  • Rolling stocks are often subjected to the effects of natural strong wind or wind pressure caused by the crossing train. These wind pressure cause the falling-off in running stability and overturn safety. It is sometimes reported that trains are blown over by a gust of wind. So, many countries enact regulations to secure the overturn safety for wind speed. In this study, theoretical equations of overturn safety based on multi-body model are derived and analyzed the difference between the result of the solid model and that of multi-body model. In case of multi-body model, it is assumed that the degrees of freedom for carbody and bogie are assigned an independent values respectively. The results show that the latter approach based on multi-body model can access the overturn safety of train and replace the conventional method by using commercial software which is accessing with decrement of wheel load.

Design of Rollover Prevention Controller Using Game-Theoretic Approach (미분게임 이론을 이용한 차량 전복 방지 제어기 설계)

  • Yim, Seongjin
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.37 no.11
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    • pp.1429-1436
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    • 2013
  • This study presents an approach for designing a vehicle rollover prevention controller using differential game theory and multi-level programming. The rollover prevention problem can be modeled as a non-cooperative zero-sum two-player differential game. A controller as an equilibrium solution of the differential game guarantees the worst-case performance against every possible steering input. To obtain an equilibrium solution to the differential game with a small amount of computational effort, a multi-level programming approach with a relaxation procedure is used. To cope with the loss of maneuverability caused by the active suspension, an electronic stability program (ESP) is adopted. Through simulations, the proposed method is shown to be effective in obtaining an equilibrium solution of the differential game.

Characteristics of the Rollover Critical Speed of a Trailer Equipped with a Tilting System (틸팅 시스템을 장착한 트레일러의 전복임계속도 특성)

  • Jeong, Tae-Gun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.19 no.2
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    • pp.64-70
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    • 2018
  • Rollover is a major concern for vehicles with a higher center of gravity and for improving driving performance. This study investigates a tilting system to prevent rollover, which was successfully implemented for high-speed trains. It may be useful to apply the concept of the tilting system to a large truck such as a trailer. Even a small adjustment in the tilting angle can improve the driving stability during a steep turn. The equation of motion was derived from a dynamic model of the trailer with the tilting system. The balance of the centrifugal force and normal force determines the rollover critical speed for a given radius of the turn and load. To obtain a more conservative criterion, the rollover critical state was defined as the instant when any side wheel loses contact with the road. To actuate the tilting system, the optimal tilting angle must be calculated from the steering angle and the vehicle speed. Using a simplified model of a large truck, the effects of the tilting angle and load on the rollover critical speed were investigated.

A Study on Realization of Display System for Monitoring of Heavy Equipment State (중장비 상태 감시를 위한 디스플레이 시스템 구현에 대한 연구)

  • Kim, Kee Hwan
    • The Journal of the Convergence on Culture Technology
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    • v.5 no.3
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    • pp.263-269
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    • 2019
  • In this study, the characteristics and operation of a multi-purpose loader equipped with various sensors such as a sensor capable of measuring the boom length, an angle sensor capable of measuring the tilt of the left and right sides of the boom and the loader, and a load cell capable of measuring the weight during lifting We have implemented a system that displays related data values. The configuration of the system reads the values from the sensors, sends them to the vehicle controller, and transmits the calculated results of the overturn rate and other important information to the display device using the CANOpen protocol. Also, in the calculation of the overturn ratio, the structure of the multi-purpose loader is similar to that of the crane belonging to the heavy equipment, and the crane overturn rate calculation method is used. Through this study, we can observe the condition of the heavy equipment and recognize the emergency situations such as abalone through the display device.