• Title/Summary/Keyword: 차량 동력학

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Total Dynamic Analysis of Deep-Seabed Integrated Mining System (심해저 광물자원 채광시스템의 통합거동 해석)

  • Kim, Hyung-Woo;Hong, Sup;Lee, Chang-Ho;Choi, Jong-Su;Yeu, Tae-Kyeong
    • Journal of Navigation and Port Research
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    • v.34 no.3
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    • pp.195-203
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    • 2010
  • This paper concerns about total dynamic analysis of integrated mining system. This system consists of vertical steel pipe, intermediate buffer station, flexible pipe and self-propelled miner. The self-propelled miner and buffer are assumed as rigid-body of 6-dof. Discrete models of vertical steel pipe and flexible pipe are adopted, which are obtained by means of lumped-parameter method. The motion of mining vessel is not considered. Instead, the motion of mining vessel is taken into account in form of various boundary conditions (e.g. forced excitation in slow motion and/or fast oscillation and so on). A terramechanics model of extremely cohesive soft soil is applied to the self-propelled miner. Hinged and ball constraints are used to define the connections between sub-systems (vertical steel pipe, buffer, flexible pipe, self-propelled miner). Equations of motion of the coupled model are derived with respect to the each local coordinates system. Four Euler parameters are used to express the orientations of the sub-systems. To solve the equations of motion of the total dynamic model, an incremental-iterative formulation is employed. Newmark-${\beta}$ method is used for time-domain integration. The total dynamic responses of integrated mining system are investigated.

A Path Control Model to Evaluation Handling Characteristic of Vehicles (조종안정성 평가를 위한 경로제어모델)

  • 탁태오;최재민
    • Transactions of the Korean Society of Automotive Engineers
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    • v.9 no.1
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    • pp.139-147
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    • 2001
  • In this study a path control scheme of simulation models of various vehicles to evaluate their handling characteristic is developed. Based on the forward target method, path deviation error is estimated and the required steering effort to reduce the error is computed by Ziegler-Nichols PID control rule. Velocity control model is also included in the proposed path control scheme to achieve the desired velocity. The path control scheme is implemented on a full vehicle model to perform ISO test procedures, such as steady state cornering, lane change, and sinusoidal input, etc. Through the simulations of ISO test procedures and comparison with actual tests, effectiveness and validity of the path control model is demonstrated.

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Optimal Design of Vehicle Suspenion Systems Using Sensitivity Analysis (민감도 해석을 이용한 현가장치의 동역학적 최적설계)

  • 탁태오
    • Transactions of the Korean Society of Automotive Engineers
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    • v.2 no.3
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    • pp.50-61
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    • 1994
  • A method for performing dynamic design sensitivity analysis of vehicle suspension systems which have three dimensional closed-loop kinematic structure is presented. A recursive form of equations of motion for a MacPherson suspension system is derived as basis for sensitivity analysis. By directly differentiating the equations of motion with respect to design variables, sensitivity equations are obtained. The direct generalize for the application of multibody dynamic sensitivity analysis. Based on the proposed sensitivity analysis, optimal design of a MacPherson suspension system is carried out taking unsprung mass, spring and damping coefficients as design variables.

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Vehicle Dynamic Analysis Using Nonlinear Finite Element Analysis Program(LS-DYNA) (비선형 유한요소 해석프로그램(LS-DYNA)을 이용한 차량 동력학해석)

  • Min, Han-Ki;Lee, Hyun;Yang, In-Young
    • Journal of the Korean Society of Safety
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    • v.17 no.3
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    • pp.36-42
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    • 2002
  • Structural integrity of either a passenger car or a light truck is one of the basic requirements for a full vehicle engineering and development program. The results of the vehicle product performance are measured in terms of ride and handling, durability, noise/vibration/harshness(NVH), crashworthiness and occupant safety. The level of performance of a vehicle directly affects the marketability, profitability and, most importantly, the future of the automobile manufacturer. In this study, we used the virtual proving ground(VPG) approach for obtaining the dynamic characteristics. VPG approach uses a nonlinear, dynamic, finite element code(LS-DYNA3D) which expands the application boundary outside the classic linear, antic assumptions. VPG approach also uses realistic boundary conditions of tire/road surface interactions. To verify the predicted dynamic results, a single lane change test has been performed. The prediction results were compared with the experimental test results, and the feasibility of the integrated CAE analysis methodology was verified.

Comparing Exhaust Gas Emission and PN in LPG and CNG Vehicle under FTP-75 and WLTC Test Mode (FTP-75, WLTC 시험 모드에서 LPG, CNG 자동차의 배출가스 및 PN 비교)

  • Jang, Jinyoung;Lee, Youngjae;Kwon, Ohseok;Kim, Jeonghwan
    • Journal of the Korean Institute of Gas
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    • v.20 no.6
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    • pp.9-15
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    • 2016
  • Liquefied petroleum gas (LPG) and compressed natural gas (CNG) are often used as fuel for vehicles because they are clean alternative gas fuels. CNG, as a low-carbon fuel, can contribute to the reduction of greenhouse gas emissions. LPG is often used as fuel for taxis because the performance is almost the same as that of gasoline but the price is lower. In the present study, the exhaust gas and the particle number (PN) of particulate matter, which is a recent environmental issue, were compared between LPG and CNG for the same vehicle. A chassis dynamometer was used to conduct the test according to the Federal Test Procedure (FTP)-75 and Worldwide harmonized Light-duty vehicle Test Procedure (WLTC) modes. The PN values of discharged particles having sizes of 5 nm or larger and 23 nm or larger were measured using two condensation particle counters (CPC). The ratio of carbon dioxide was high in the exhaust gas from the LPG vehicle; the ratio of methane was high in the exhaust gas from the CNG vehicle. The PN values of the emitted particles from the two fuels were similar. The PN values of particles having sizes of 23 nm or smaller were high in the high-speed WLTC mode.

A study on Shift Efficiency Characteristics of a 2-speed Transmission applying CVT Structure (CVT구조를 적용한 2단 변속기의 효율특성에 관한 연구)

  • Kwang-Wook Youm
    • Journal of the Korean Institute of Gas
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    • v.28 no.1
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    • pp.59-64
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    • 2024
  • In this study, we conducted research on a miniaturized transmission system suitable for ultra-compact electric vehicles, such as electric arts or small electric cars. While conventional electric vehicles eliminate multi-gear transmissions and control motor output or secure initial driving force through reducers, in vehicles like electric karts or compact electric cars, which have relatively small battery capacities, the driving range can be reduced or the motor can be stressed epending on the loading state. Therefore, in this study, we developed a low stage ratio 0.625 and high stage ratio 1.6 a two-stage transmission system that can change gears as needed, considering factors such as slope conditions and loading status, by applying the continuously variable transmission (CVT) mechanism. Based on the selected gear ratios, we designed the transmission and created a test rig to verify the power transmission efficiency of the developed transmission. Using the test rig, we varied the rotational speed and load of the transmission to confirm its power transmission characteristics and also examined the heat generation characteristics during shifting and operation. As a result, developed a two-stage transmission with a CVT structure.

Steering Control of Differential Brake System using Fuzzy Algorithm (퍼지 알고리즘을 이용한 차동 브레이크 시스템의 조향제어)

  • 윤여흥;제롬살랑선네;장봉춘;이성철
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.05a
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    • pp.233-237
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    • 2002
  • Vehicle Dynamics Control(VDC) has been a breakthrough and become a new terminology for the safety of a driver and improvement of vehicle handling. This paper examines the usefulness of a brake steer system (BSS), which uses differential brake forces for steering intervention in the context of VDC. In order to help the car to turn, a yaw moment can be achieved by altering the left/light and front/rear brake distribution. The steering function achieved through BSS can then be used to control lateral position in an unintended road departure system. A 8-DOF non-linear vehicle model including STI tire model will be validated using the equations of motion of the vehicle, and the non-linear vehicle dynamics. Since Fuzzy logic can consider the nonlinear effect of vehicle modeling, Fuzzy controller is designed to explore BSS feasibility, by modifying the brake distribution through the control of the yaw rate of the vehicle. The control strategies developed will be tested by simulation of a variety of situation; the possibility of VDC using BSS is verified in this paper.

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Analysis on the Clutch Torque of Automated Manual Transmission Vehicle during Dynamometer Test (동력계 시험을 이용한 자동화 수동변속차량의 클러치 토크 분석)

  • Choi, Woo-Seok;Lim, Wonsik;Oh, Ducksoo;Park, Sung-cheon
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.24 no.3
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    • pp.287-293
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    • 2015
  • With the rise in oil prices and ongoing concerns about environment, there is an increased amount of interest in automated manual transmission (AMT) vehicles. Torque control in an AMT vehicle is attained by controlling the displacement of the dry-type clutch's actuator. To provide good ride comfort akin to that of an automatic transmission vehicle, the clutch control is vital to an AMT vehicle. In this study, a method of obtaining the clutch torque from a dynamometer test is devised. This method is able to identify the relationship between the displacement of the clutch actuator and the clutch torque. A simulator for estimating the performance of an AMT vehicle is developed using MATLAB Simulink. The results obtained from both the vehicle and simulation exhibit a similar trend.

A Study on the Development of Earlier Automobile Styling (초기 자동차 스타일의 형성기에 대한 고찰)

  • 이호숭
    • Archives of design research
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    • v.11 no.1
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    • pp.1-10
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    • 1998
  • In the medieval age of Europe when the noble people of various regions enjoyed unique cultures and life styles where made by coachbuilders. Such coaches would later affect the styles of the earlier automobiles equipped with the driving engine. Later, as the gasolines engines began to be distributed, the automobiles could afford to be flexible in terms of size and weight, while their performances and designs began to be enhanced rapidly. The important aspect of earlier automobile manufacturing was the phased development of styling which represented the pure approach to functions as well as the historical background. It can be known that such a development of automobile styling reflected the concerned industrial advancement and social influences of each region. At this juncture of time when the massmotorized modern society's demands for automobiles are unlimited and diversified, this study was aimed at reviewing the fundamental implications of automobile designs over time.

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A Comparative Study on the Measurement of Smoke from Diesel Vehicle on Chassis-dynamometer using Reflection Photo and Light Extinction Method (차대 동력계에서의 디젤 차량의 매연 측정을 위한 여지 반사식 및 광투과식 측정법의 비교 연구)

  • Kim, Ju-Chul;Lee, Choong-Hoon
    • Journal of the Korean Society of Safety
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    • v.22 no.6
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    • pp.13-19
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    • 2007
  • Diesel car's smoke measurement equipment and method were investigated based on the exhaust gas regulations. Reflection photo method and light extinction method for measuring smoke were compared under conditions of both no load mode and Lug-down 3 mode. Free acceleration mode at no load condition was used for regular inspection of diesel car, and Lug-down 3 mode was used for fine inspection of the diesel car. A correlation between no load mode and Lug-down 3 mode was investigated in this research. The smoke measured with reflection photo method was 1.5${\sim}$2 times higher than that of light extinction method The correlation coefficient between reflection photo method and light extinction method for measuring smoke was 0.83, which shows comparatively high correlation between the two methods for measuring smoke in diesel engines.