• Title/Summary/Keyword: WD model

Search Result 62, Processing Time 0.025 seconds

Dynamic Performance Analysis for 4WD/4WS Electric-driven Vehicles (4WD/4WS 전기 구동 차량의 동역학적 성능 해석)

  • 김준영;계경태;박건선;허건수;장경영;오재응
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.4 no.2
    • /
    • pp.209-220
    • /
    • 1996
  • In this paper, dynamic performance of 4WD/4WS Electric-driven vehicles is investigated. A coupled dynamic model is introduced for longitudinal, lateral and yawing motion of 4WD/4WS vehicles. Based on the coupled model, dynamic performance is analyzed for steady-state steering, acceleration steering and brake steering, respectively. These non steady-state cornering analysis is important for non-paved road maneuvering, trajectory projection for armored vehicle and future AVCS(Advanced Vehicle Control System) technology. Simulation results are obtained based on a simulink module for the introduced model.

  • PDF

A Study on Independent Steering & Driving Control Algorithm for 6WS/6WD Vehicle (6WS/6WD 차량의 독립조향 및 구동 제어알고리즘에 관한 연구)

  • Kim, Chang-Jun;Han, Chang-Soo
    • Journal of Institute of Control, Robotics and Systems
    • /
    • v.17 no.4
    • /
    • pp.313-320
    • /
    • 2011
  • Multi-axle driving vehicles that are used in special environments require high driving performance, steering performance, and stability. Among these vehicles, 6WS/6WD vehicles with middle wheels have structural safety by distributing the load and reducing the pitch angle during rapid acceleration and braking. 6WS/6WD vehicles are favored for military use in off road operations because of their high maneuverability and mobility on extreme terrains and obstacles. 6WD vehicles that using in-wheel motor can generate the independent wheel torque without other mechanical parts. Conventional vehicles, however, cannot generate an opposite driving force at each side wheel. Using an independent steering and driving system, six-wheel vehicles can show better performance than conventional vehicles. Using of independent steering and driving system, the 6 wheel vehicle can improve a performance better than conventional vehicle. This vehicle enhances the maneuverability under low speed and the stability at high speed. This paper describes an independent 6WS/6WD vehicle, consists of three parts; Vehicle Model, Control Algorithm for 6WS/6WD and Simulation. First, vehicle model is application of TruckSim software for 6WS and 6WD. Second, control algorithm describes the optimum tire force distribution method in view of energy saving. Last is simulation and verification.

Evaluation of Fuel Economy and Performance for 2WD and 4WD Hybrid Electric Vehicle Based on Backward Simulation (2륜 및 4륜 구동 하이브리드 전기 자동차의 후방향 시뮬레이션 기반 연비 및 성능 평가)

  • Jeong, Jongryeol;Kim, Hyungkyoon;Kim, Kiyoung;Lim, Wonsik;Cha, Suk Won
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.22 no.1
    • /
    • pp.174-182
    • /
    • 2014
  • Recently, not only common types of hybrid electric vehicle (HEV) such as series or parallel but many other types of HEVs including 4WD hybrid electric vehicle have been developed and released. In this study, analysis of fuel economy and driving performance for 2WD and 4WD HEV are conducted using backward simulation based on dynamic programming. To analyze the characteristics of 4WD HEV, tire slip model based on vehicle dynamics was applied to the backward simulation program. As a result, 2WD HEV shows better fuel economy than 4WD HEV because of relatively simple configuration. However, in a severe road condition, 4WD HEV shows better driving performance that 2WD HEV had about 6% of impossible time to follow the driving cycle though the 4WD HEV had no impossible time.

Prdiction of Tractive Performance of Wheeled Vehicles on Soft Terrains (휠형차량의 연약지 견인성능 예측)

  • 박원엽;이규승
    • Journal of Biosystems Engineering
    • /
    • v.25 no.5
    • /
    • pp.359-368
    • /
    • 2000
  • In this paper, mathematical model was developed for predicting the tractive performance of off-road wheeled vehicles operated on soft terrains. Based on the mathematical model, a computer simulation program(TPPMWV) was developed. The model takes into account main design parameters of wheeled vehicle, including radius and width of front and rear tire, weight of vehicle, wheelbase and driving type(4WD, 2WD). Soil characteristics, such as the peressure-sinkage and shearing characteristics and the response to repetitive loading and slip-sinkage effect, are also taken into consideration. The effectiveness of the developed model was verified by comparing the predicted drawbar pulls using TPPMWV with measured ones obtained by field tests for two different driving types of wheeled vehicle. As a results, the drawbar pulls predicted by the TPPMWV were well matched to the measured ones within the absolute errors of 3.916%(4WD) and 13.31%(2WD) for two different driving types, respectively.

  • PDF

Prediction of Tractive Performance of Off-Road Wheeled Vehicles (로외에서 운용되는 휠형차량의 견인성능 예측)

  • 박원엽;이규승
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.8 no.5
    • /
    • pp.188-195
    • /
    • 2000
  • This study was conducted to develop the mathematical model and the computer simulation program(TPPMWV) for predicting the tractive performance of off-road wheeled vehicles operated on various soil conditions. The model takes into account main design parameters of a wheeled vehicle, including the radius and width of front and rear tires, the weight of vehicle, wheelbase and driving type(4WD, 2WD). Soil characteristics, such as the peressure-sinkage and shearing characteristics and the response to repetitive loading, are also taken into consideration. The effectiveness of the developed model was verified by comparing the predicted drawbar pulls using TPPMWV with measured ones obtained by field tests for two different driving types of wheeled vehicle. As a results, the drawbar pulls predicted by the TPPMWV were well matched to the measured ones within the absolute errors of 5.25%(4WD) AND 9.42%(2WD)for two different driving types, respectively.

  • PDF

Mathematical Model for Dynamic Performance Analysis of Multi-Wheel Vehicle (다수의 바퀴를 가진 차량의 동적 거동 해석의 수학적 모델)

  • Kim, Joon-Young
    • Journal of the Korea Convergence Society
    • /
    • v.3 no.4
    • /
    • pp.35-44
    • /
    • 2012
  • In this study, a simulation program is developed in order to investigate non steady-state cornering performance of 6WD/6WS special-purpose vehicles. 6WD vehicles are believed to have good performance on off-the-road maneuvering and to have fail-safe capabilities. But the cornering performances of 6WS vehicles are not well understood in the related literature. In this paper, 6WD/6WS vehicles are modeled as a 18 DOF system which includes non-linear vehicle dynamics, tire models, and kinematic effects. Then the vehicle model is constructed into a simulation program using the MATLAB/SIMULINK so that input/output and vehicle parameters can be changed easily with the modulated approach. Cornering performance of the 6WS vehicle is analyzed for brake steering and pivoting, respectively. Simulation results show that cornering performance depends on the middle-wheel steering as well as front/rear wheel steering. In addition, a new 6WS control law is proposed in order to minimize the sideslip angle. Lane change simulation results demonstrate the advantage of 6WS vehicles with the proposed control law.

On the Design of a WiFi Direct 802.11ac WLAN under a TGn MIMO Multipath Fading Channel

  • Khan, Gul Zameen;Gonzalez, Ruben;Park, Eun-Chan
    • KSII Transactions on Internet and Information Systems (TIIS)
    • /
    • v.11 no.3
    • /
    • pp.1373-1392
    • /
    • 2017
  • WiFi Direct (WD) is a state of the art technology for a Device-to-Device (D2D) communication in 802.11 networks. The performance of the WD system can be significantly affected by some key factors such as the type of application, specifications of MAC and PHY layer parameters, and surrounding environment etc. It is, therefore, important to develop a system model that takes these factors into account. In this paper, we focus on investigating the design parameters of the PHY layer that could maximize the efficiency of the WD 802.11 system. For this purpose, a basic theoretical model is formulated for a WD network under a 2x2 Multiple In Multiple Out (MIMO) TGn channel B model. The design level parameters such as input symbol rate and antenna spacing, as well as the effects of the environment, are thoroughly examined in terms of path gain, spectral density, outage probability and Packet Error Rate (PER). Thereafter, a novel adaptive algorithm is proposed to choose optimal parameters in accordance with the Quality of Experience (QoE) for a targeted application. The simulation results show that the proposed method outperforms the standard method thereby achieving an optimal performance in an adaptive manner.

Behavior Analysis of In-wheel Drive Type 6WD/6WS Vehicle Based on System Modeling and Driving Simulation (시스템 모델링 및 주행 시뮬레이션을 통한 인휠드라이브 타입 6WD/6WS 차량 플랫폼의 주행 거동 분석)

  • Lee, Jung-Yeob;Suh, Seung-Whan;Shon, Woong-Hee;Yu, Seung-Nam;Han, Chang-Soo
    • Journal of Institute of Control, Robotics and Systems
    • /
    • v.16 no.4
    • /
    • pp.353-360
    • /
    • 2010
  • A skid-steering method which applied to the various mobile robot platforms currently shows its effectiveness in the specified field areas and purposes. This system contains however, several problems of its intrinsic properties such as slippages occurred by different moving direction between vehicle's driving and wheel's rotary and difficulties of driving performance control and so on. This paper deals with the suggestion of suitable control algorithm for 6WD/6WS skid steering wheeled vehicle and verified its feasibility by analyzing the behavior of 6WD/6WS skid-steered wheeled vehicle model and by applying the engineering analytical method to the considered mobile platform. The Performance of vehicle model is evaluated by using slip mode control to follow the steering input and, as a future work, this control algorithm could be applied to real 6WD/6WS in-wheel drive type vehicle finally.

AN APPLICATION OF WD MODEL TO EB TYPE CONTACT BINARY SYSTEM (EB형 접촉식쌍성에 대한 WD 모델 적용에 관한 분석)

  • 오규동;오수연
    • Journal of Astronomy and Space Sciences
    • /
    • v.17 no.2
    • /
    • pp.163-172
    • /
    • 2000
  • The EB type contact binaries show large temperature difference $(\mid\bigtriangleup T\mid\geq1,000K)$ between two components. Thus we have modified the mode 3 of the WD program to adjust albedos, limb darkening coefficients and gravity darkening exponents for both components of such binaries, while the values for those parameters should be same for both components in the original WD program. Both of the modified and the original versions have been applied to the EB type contact binaries such as DO Cas, GO Cyg, and FS Lup. The computed light curves with modified version fit better to the observations.

  • PDF

Dynamic Performance Analysis for 6WD/6WS Armored Vehicles (6WD/6WS 군용차량의 동역학적 성능해석)

  • 홍재희;김준영;허건수;장경영;오재응
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.5 no.6
    • /
    • pp.155-166
    • /
    • 1997
  • In this study, a simulation tool is developed in order to investigate non steady-state cornering performance of 6WD/6WS special-purpose vehicles. 6WD vehicles are believed to have good performance on off-the-road maneuvering and to have fail-safe capabilities. But the cornering performances of 6WS vehicles are not well understood in the related literature. In this paper, 6WD/6WS vehicles are modeled as a 18 DOF system which includes non-linear vehicle dynamics, tire models, and kinematic effects. Then the vehicle model is constructed into a simulation tool using the MATLAB /SIMULINK so that input/output and vehicle parameters can be changed easily with the modulated approach. Cornering performance of the 6WS vehicle is analyzed for brake steering and pivoting, respectively. Simulation results show that cornering performance depends on the middle-wheel steering as well as front/rear wheel steering. In addition, a new 6WS control law is proposed in order to minimize the sideslip angle. Lane change simulation results demonstrate the advantage of 6WS vehicles with the proposed control law.

  • PDF