• Title/Summary/Keyword: 전륜

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Design Optimization of Hydroforming Chassis Part for improving Front Suspension Performance (전륜 서스펜션 성능향상을 위한 하이드로포밍 샤시 부품의 설계 최적화)

  • Moon, M.B.;Kim, Y.G.;Kim, H.S.;Jin, K.S.;Kim, D.H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2009.05a
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    • pp.187-190
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    • 2009
  • Recently, automotive companies have invested in vehicle weight reduction and clean car development because of oil price rises and environmental problems. In particular, USA car makers have developed the vehicle spending 1 liter per 34km complying with PNGV(Partnership for a new generation of vehicle) and Europe car makers have developed the vehicle spending 3 liters per 100km. The USA government announced "The green car policy" in order to boost production of more fuel effective cars in 2009. According to the policy, it will be restricted to sell the car which spends more than 1 liter per 14.9km by 2020. To satisfy the current situations on automotive market, hydroforming technology has widely adapted vehicle structures such as engine cradle, chassis frame, A pillar, radiator support, etc. However, automotive companies have to consider formability and performance to improve and maximize the benefit from this technology in advance of detail design. The paper deals with one of the vehicle weight reduction methods using tube hydroforming technology and platform commonality in front suspension. FEA simulation is also introduced to evaluate hydro-formability and NVH performance at the beginning of design stage which is the best way to reduce the failure cost.

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Design and Evaluation of AFS and ARS Controllers with Sliding Mode Control and Fuzzy Logic Control Method (Sliding Mode Control 및 Fuzzy Logic Control 방법을 이용한 AFS 및 ARS 제어기 설계 및 성능 평가)

  • Song, Jeonghoon
    • Transactions of the Korean Society of Automotive Engineers
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    • v.21 no.2
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    • pp.72-80
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    • 2013
  • This study is to develop and evaluate an AFS and an ARS controllers to enhance lateral stability of a vehicle. A sliding mode control (SMC) and a fuzzy logic control (FLC) methods are applied to calculate the desired additional steering angle of AFS equipped vehicle or desired rear steer angle of ARS equipped vehicle. To validate AFS and ARS systems, an eight degree of freedom, nonlinear vehicle model and an ABS controllers are also used. Several road conditions are used to test the performances. The results showed that the yaw rate of the AFS and the ARS vehicle followed the reference yaw rate very well within the adhesion limit. However, the AFS improves the lateral stability near the limit compared with the ARS. Because the SMC and the FLC show similar vehicle responses, performance discrimination is small. On split-${\mu}$ road, the AFS and the ARS vehicle had enhanced the lateral stability.

Design and Implementation of an Omni Wheel-Based Wheelchair Capable of Posture Transformation (전륜 옴니휠을 적용한 자세 변환 휠체어의 설계 및 구현)

  • Ryu, Hye-Yeon;Kwon, Je-Seong;Lim, Jeong-Hak;Lee, Kyung-Chang
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.20 no.9
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    • pp.97-103
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    • 2021
  • In this paper, an omni wheel-based electric wheelchair is proposed that can achieve safe and convenient movement and can improve the convenience of living for mobility-impaired people who cannot move on their own. Generally, mobility-impaired people are afflicted with physical health issues such as pain and secondary body deformities because they often remain seated in wheelchairs for long periods of time. Hence, an electric wheelchair is required whose posture can be changed and whose size can be adjusted according to the user's body type. Such a wheelchair should also facilitate easy change of direction (even in a narrow space) for convenient movement. In this paper, an electric wheelchair featuring omni wheels is proposed that allows posture transformation and facilitates movement in a narrow space. It is believed that the proposed wheelchair can aid in enhancing the convenience of living for mobility-impaired people.

Yaw Moment Control for Modification of Steering Characteristic in Rear-driven Vehicle with Front In-wheel Motors (전륜 인휠모터 후륜구동 차량의 선회 특성 변형을 위한 요모멘트 제어)

  • Cha, Hyunsoo;Joa, Eunhyek;Park, Kwanwoo;Yi, Kyongsu;Park, Jaeyong
    • Journal of Auto-vehicle Safety Association
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    • v.13 no.1
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    • pp.6-13
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    • 2021
  • This paper presents yaw moment control for modification of steering characteristic in rear-driven vehicle with front in-wheel motors (IWMs). The proposed control algorithm is designed to modify yaw rate response of the test vehicle. General approach for modification of steering characteristic is to define the desired yaw rate and track the yaw rate. This yaw rate tracking method can cause the chattering problem because of the IWM actuator response. Large overshoot and settling time in IWM torque response can amplify the oscillation in control input and yaw rate. To resolve these problems, open-loop IWM controller for cornering agility was designed to modify the understeer gradient of the vehicle. The proposed algorithm has been investigated via the computer simulations and the vehicle tests. The performance evaluation has been conducted on dry asphalt using E-segment test vehicle. The performance of the proposed algorithm has been compared to general yaw rate tracking algorithm in the vehicle tests. It has been shown that the proposed control law improved the cornering agility without chattering problem.

Improvement of the Yaw Motion for Electric Vehicle Using Independent Front Wheel Steering and Four Wheel Driving (독립 전륜 조향 및 4륜 구동을 이용한 전기 차량의 선회 운동 향상)

  • Jang, Jae-Ho;Kim, Chang-Jun;Kim, Sang-Ho;Kang, Min-Sung;Back, Sung-Hoon;Kim, Young-Soo;Han, Chang-Soo
    • Journal of Institute of Control, Robotics and Systems
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    • v.19 no.1
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    • pp.45-55
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    • 2013
  • With the recent advancement of control method and battery technology, the electric vehicle have been researched to replace the conventional vehicle with electric vehicle with the view point of the environmental concerns and energy conservation. An electric vehicle which is equipped with the independent front steering system and in-wheel motors has advantage in terms of control. For example, the different torque which generated by left and right wheels directly can make yaw moment and the independent steering using outer wheel control is able to reduce the sideslip angle. Using of independent steering and driving system, the 4 wheel electric vehicle can improve a performance better than conventional vehicle. In this paper, we consider the method for improving the cornering performance of independent front steering system and in-wheel motor used electric vehicle with the compensated outer wheel angle and direct yaw moment control. Simulation results show that the method can improve the cornering performance of 4 wheel electric vehicle. We also apply the steering motor failure to steer the vehicle turned by the torque difference without steering. This paper describes an independent front steering and driving, consist of three parts; Vehicle Model, Control Algorithm for independent steering and driving and simulation. First, vehicle model is application of TruckSim software for independent front steering and 4 wheel driving. Second, control algorithm describes the reduced sideslip and direct yaw moment method in view of cornering performance. Last is simulation and verification.

A Convergence Study through Durability Analysis due to the Shaft Length of Automotive Constant Velocity Joint (자동차 등속 조인트 샤프트 길이에 따른 내구성 해석을 통한 융합연구)

  • Choi, Gye-Gwang;Cho, Jae-Ung
    • Journal of the Korea Convergence Society
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    • v.9 no.8
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    • pp.179-184
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    • 2018
  • The driving methods of car are front wheel drive, rear wheel drive and four wheel drive. At driving methods, constant velocity joint is the most important part at carrying out two functions for converting to the direction which the driver wants and transferring the power to wheels. At driving on the road, the impact can be applied to the parts transmitting power according to the state of road surface. In this study, each models of three constant velocity joints whose shaft length are different respectively were modelled with CATIA and the structural and fatigue analyses were carried out by using ANSYS. This study result is thought to be the useful material at designing the constant velocity joint with the durability against impact. And it is possible to be grafted onto the convergence technique at the design of constant velocity joint and show the esthetic sense.

Multidisciplinary Design Optimization of Vehicle Front Suspension System Using PIDO Technology (PIDO 기술을 이용한 차량 전륜 현가계의 다분야통합최적설계)

  • Lee, Gab-Seong;Park, Jung-Min;Choi, Byung-Lyul;Choi, Dong-Hoon;Nam, Chan-Hyuk;Kim, Gi-Hoon
    • Transactions of the Korean Society of Automotive Engineers
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    • v.20 no.6
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    • pp.1-8
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    • 2012
  • Multidisciplinary design optimization (MDO) for a suspension component of the vehicle front suspension was performed in this research. Shapes and thicknesses of the subframe were optimized to satisfy multi-disciplinary design requirements; weight, fatigue, crash, noise, vibration, and harshness (NVH), and kinematic and compliance (K&C). Analyses procedures of the performance disciplines were integrated and automated by using the process integration and design optimization (PIDO) technique, and the integrated and automated analyses environments enabled various types of analytic design methodologies for solving the MDO problem. We applied an approximate optimization technique which involves sequential sampling and metamodeling. Since the design variables for thicknesses should be dealt as discrete variables. the evolutionary algorithm is selected as optimization technique. The MDO problem was formulated three types of problems according to the order of priorities among the performance disciplines, and the results of MDO provided design alternatives for various design situations.

A Improvement Study on Safety Assurance of Main Landing Gear Failure for Rotary Wing Aircraft (회전익 항공기 안전 확보를 위한 주륜완충장치 결함 개선연구)

  • Choi, Jae Hyung;Chang, Min Wook;Lim, Hyun-Gyu;Lee, Je Suk
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.45 no.6
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    • pp.490-497
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    • 2017
  • The Main Landing Gear(MLG) of Rotary Wing Aircraft is an essential equipment in Landing System for pilot to perform a flight mission. It supports the fuselage at ground and absorbs the impact from the ground when landing, thereby, these functions sustain operational capability for pilot and crew. However, the A aircraft caused asymmetry and leakage hydraulic when it was stationed on the ground. Therefore, this paper summarizes pilot comments in operation which are classified by cause of occurrence and the troubleshooting process about each comment. It also describes design improvements which was derived from troubleshooting and suggests verification results of flight test.

Side Force Modeling of Landing Gear and Ground Directional Controller Design for UAV (무인기용 착륙장치 측력 모델링 및 지상활주 제어기 설계)

  • Cho, Sung-Bong;Ahn, Jong-Min;Hur, Gi-Bong
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.42 no.12
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    • pp.997-1003
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    • 2014
  • This paper describes modeling process to obtain precise landing gear model which is necessary to design a control law for ground auto-taxi, auto take-off/landing of UAV. In this paper, landing gear side force modeling is studied to complete a landing gear model of UAV. Side force modeling is performed by calculating cornering angle including steering angle. And ground directional controller is designed by using nose wheel steering and rudder steering at the same time to control course angle error. Accuracy of landing gear side force modeling and ground directional controller is proved by comparing of auto-taxi test results with simulation results.

Development of Algorithm for Advanced Driver Assist based on In-Wheel Hybrid Driveline (인휠 전기 구동 기반의 능동안전지원 알고리즘 개발)

  • Hwang, Yun-Hyoung;Yang, In-Beom
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.12
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    • pp.1-8
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    • 2017
  • This paper presents the development of an adaptive cruise control (ACC) system, which is one of the typical advanced driver assist systems, for 4-wheel drive hybrid in-wheel electric vehicles. The front wheels of the vehicle are driven by a combustion engine, while its rear wheels are driven by in-wheel motors. This paper proposes an adaptive cruise control system which takes advantage of the unique driveline configuration presented herein, while the proposed power distribution algorithm guarantees its tracking performance and fuel efficiency at the same time. With the proposed algorithm, the vehicle is driven only by the engine in normal situations, while the in-wheel motors are used to distribute the power to the rear wheels if the tracking performance decreases. This paper also presents the modeling of the in-wheel motors, hybrid in-wheel driveline, and integrated ACC control system based on a commercial high-precision vehicle dynamics model. The simulation results obtained with the model are presented to confirm the performance of the proposed algorithm.