• Title/Summary/Keyword: Percent Maximum Overshoot

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Optimization of the Suspension Design to Reduce the Ride Vibration of 90kW-Class Tractor Cabin (90kW급 트랙터 캐빈의 승차 진동 저감을 위한 현가장치 설계 최적화)

  • Chung, Woo-Jin;Oh, Ju-Sun;Park, Yoonna;Kim, Dae-Cheol;Park, Young-Jun
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.16 no.5
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    • pp.91-98
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    • 2017
  • This study was conducted to optimize the spring constant and the damping coefficient, which are design parameters of the tractor cabin suspension system, to minimize the ride vibration. A 3D tractor MBD (multi-body dynamics) model with a cabin suspension system was developed using a dynamic analysis program (Recurdyn). Using the developed model and optimization algorithm, the spring constant and the damping coefficient, which are the design parameters of the cabin suspension for the tractor, was were optimized so thatto minimize the maximum overshoot for the vertical displacement of the cabin was minimized. The percent maximum overshoot of the tractor cabin was simulated for the 13 initial models, which were obtained using the ISCD-II method, and for the 3 additional SAO models presented in the optimization algorithm software. The model that represents with the smallest percent maximum overshoot among the 16 models was selected as the optimized model. The percent maximum overshoot of the optimized model was about approximately 5% lower than that of the existing model.

A Design on Collision Avoidance System of Vehicle using Fuzzy Control Algorithms (퍼지제어 알고리즘을 이용한 차량의 충돌방지 시스템 설계)

  • Choo, Yeon-Gyu;Kim, Seung-Cheo
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • v.9 no.2
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    • pp.705-709
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    • 2005
  • In this paper, we introduce fuzzy algorithm similar to human's way of thinking and designed collision detection system of vehicles. First, before the model vehicles design, we did simulation collision detection using PID and Fuzzy Controller. As a result, P.O that is Percent Overshoot when make use of PID controller happened from smallest 32% to 45%. But, In case of using fuzzy controller they produced about 10% in 7% in case use 25 rule. We designed model vehicles that introduce Auto Guided Vehicle(AGV) with confirmed result in simulation. We set Polaroid 6500 sensor on the front of model automobile because distinguish existence automobile to the head. And we composed motor drive part to run vehicles and 80C196KC processor for control movement of vehicles influenced on distance data of the front vehicles that receive from supersonic waves sensor. In case of using Fuzzy controller, last value percent error happened about maximum 15% in smallest 5%, and we confirmed that distance with front vehicles kept when state hold time is about maximum 16 seconds in smallest 10 seconds.

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