• Title/Summary/Keyword: 조향 민감도

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Dynamic Analysis of an Automotive Suspension System with a 3-D Model (3차원 모델에 의한 차량 현가계의 동적해석)

  • 이재형;최영휴;이장무
    • Journal of the KSME
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    • v.33 no.10
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    • pp.856-860
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    • 1993
  • 차량의 조종안정성을 해석하기 위해서는 차륜과 현가장치에 의한 비선형성과 조향장치의 동특성 등을 고려한 3차원 차량 모델을 이용하여 정상상태와 과도상태에서의 조향입력에 대한 차량 주 행역학을 해석하여야 한다. 승차감, 조향성능, 주행안정성 등의 동적성능과 현가장치의 특성관 계를 규명하기위하여 3차원 차량모델에 의한 해석과 설계변수에의 민감도 해석을 수행할 필요가 있다.

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Effects of EPS Assist Torque on On-center Steering Feel Indices (EPS 어시스트 토크에 의한 온 센터 조타감 성능지수 영향도 분석)

  • Kim, Sang Sup;Kyeong, Jin Sil
    • Transactions of the Korean Society of Automotive Engineers
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    • v.22 no.3
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    • pp.186-193
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    • 2014
  • On-center handling feel indices are the important numerical factors that meaning performance of manuability and stability felt by drivers. They should be considered to suspension design. The major factor that affect to these indices is the shape of assist torque curve. This paper presents the variables that meaning the shape of the assist torque curve and analyze the effect of each variables. And using interaction formulas, it is proposed that the method to extract the variables that satisfy the goal indices. The result of simulation that applied assist torque curve extracted by the method demonstrate the capability of this method with error under 8%.

Effect of Design Factors on the Vibration of the Steering Wheel of a Passenger Car (승용차 조향계 진동에 미치는 제인자)

  • 박철희;홍성철;송상기
    • The Journal of the Acoustical Society of Korea
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    • v.10 no.5
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    • pp.37-45
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    • 1991
  • 일반 소형 승용차의 고속 주행시 발생하는 진동 중 조향휠의 원주방향의 진동인 shimmy 현상을 연구하였다. Shimmy 현상은 쾌적한 차량 설계단계에서 예측할 수 있고 그 원인을 추정할 수 있도록 조 향계의 모델링 및 이론해석을 하였으며 실험결과치와의 비교검토를 통하여 모델링에 대한 타당성을 검 증하였다. 검증된 모델링을 이용하여 조향계를 구성하는 각 부재의 감쇠, 강성, 타이어의 트레일 및 stabilizer bar 의 강성등의 변화가 조향휠 진동에 미치는 영향을 고찰하였다. 특히 shimmy 현상이 타이 어의 편마모등에 의한 unbalance mass에 얼마나 민감한가를 실험 및 이론적인 해석을 통하여 고찰하였다.

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Application of Sensitivity Analysis to Vehicle Handling with Equivalent Cornering Stiffness (등가 코너링강성을 사용한 차량의 조종안정성에 대한 민감도 해석)

  • Lee, Chang-Ro
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.4
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    • pp.1434-1439
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    • 2012
  • Vehicle is a dynamic system combined with various parameters. Dynamic characteristics of a vehicle can vary with the change of these parameters. To investigate the effect of the design parameter on vehicle handling performance the sensitivity analysis is carried out by the numerical method. The vehicle model is described by equivalent cornering stiffness that considers parameters of suspension and steering system. As the analysis results show the effect on the static and dynamic characteristics of the vehicle system, the sensitivity analysis can be used for synthesis of the design parameters to improve the vehicle handling characteristics at the design stage as well as during the vehicle test under development.

Biomechanical Analysis of Arm Motion during Steering Using Motion Analysis Technique (동작분석기법을 이용한 조향동작에 대한 팔의 생체역학적 특성분석)

  • Kim, Young-Hwan;Tak, Tea-Oh
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.35 no.11
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    • pp.1391-1398
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    • 2011
  • Biomechanical analysis of arm motion during steering was performed using a motion analysis technique. Three-dimensional position data for each part of arm are fed into an interactive model combining a musculoskeletal arm model and the mechanical steering system to calculate joint angles and torques using inverse kinematic and dynamic analyses, respectively. The analysis shows that elbow pronation/supination, wrist flexion/extension, shoulder adduction/abduction, and shoulder flexion/extension have significant magnitudes. Sensitivity analysis of the arm joint motion with respect to seating posture and steering wheel configuration is carried out to investigate the qualitative influence of the seating posture and driver's seat configuration on the steering behavior.

Characteristic Investigation of Design Parameters on the Hydraulic Power Steering Gear Box (유압식 동력 조향기어 박스에서 설계변수의 특성검토)

  • Jang, Joo-Sup;Yoon, Young-Hwan
    • Transactions of the Korean Society of Automotive Engineers
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    • v.16 no.4
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    • pp.135-142
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    • 2008
  • Hydraulic power steering system has been adopted in seniority passenger and commercial vehicle system for an easy maneuverability and a smoother ride. In this study, hydraulic power steering system analysis model which includes hydraulics and mechanical sub-systems was developed using commercial software, AMESim in order to predict characteristics for various steering components. Each component which constructs system was modeled and verified by experimentally obtained characteristics curves of each components. The parameter sensitivity analysis such as valve opening area, torsional stiffness of torsion bar for system design are carried out by the analysis and experimental method. The predicted results by the development model were a good agreement with experimentally obtained results. The sensitivity investigation results rotary torque when changing an input shaft edge width, was most sensitive, to change in angle and slot width and supply flow of input shaft edge is not a lot sensitively.

Development of Performance Analysis Program for a Hydraulic Shimmy Damper of Steering System (조향계 유압 시미댐퍼의 성능해석 프로그램 개발)

  • 이재천;정용승;김진홍
    • Transactions of the Korean Society of Automotive Engineers
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    • v.12 no.1
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    • pp.174-183
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    • 2004
  • A program to analyze the performance characteristics of a hydraulic shimmy damper for automotive steering system was developed in this study. Dimensionless mathematical equations of the dynamics of shimmy damper for forward and reverse fluid flows were derived respectively and incorporated into the Simulink models. The program was validated by comparing the results of simulation and experiments for various frequencies of upstream ripple pressures into the damper. Low-pass filter characteristics of the shimmy damper at reverse flow was demonstrated which means that the shimmy damper could alleviate the high speed ripple pressures induced by the unbalance oscillation of tire in vehicle driving. The parameter sensitivity analysis was also conducted to identify the dominant parameters for the damper performance.

An Autonomous Driving System Based on Stereo-Vision and End-to-End Learning (스테레오 비전 및 End-to-End Learning 기반 자율주행 시스템)

  • Ye-Joong Yoon;Ji-Hwan Song;Hyeong-Seob Byeon;Bae-Seong Park;Jong-hyun Kim
    • Proceedings of the Korea Information Processing Society Conference
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    • 2023.11a
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    • pp.1171-1172
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    • 2023
  • 자율주행 기술에서 스테레오 비전과 End-to-End Driving은 많이 사용되는 기술이며 본 연구에서는 이를 신호등 인식과 주행에 적용하였다. 신호등 인식은 좌우 카메라로부터 적색 원을 인식한 후 스테레오 비전을 통해 신호등과의 거리를 추정한다. 주행 시스템은 End-to-End Learning 기반으로 이루어지며, 출력값인 가변저항을 조향각으로 변환하여 제어할 수 있다. 또한 감마 보정을 통한 데이터 증강을 통해 빛에 대해 민감하지 않게 모델을 학습하였다. 추후 신호등 인식 시 HSV 필터가 빛에 민감한 점과 주행 시 가변저항 값이 일정하지 않은 점이 해결된다면 더욱 안정적인 시스템을 구축할 수 있을 것으로 기대된다.

A Study for High Speed Judder Evaluation on Brake System (제동 시스템에서 고속 저더 개선 평가에 관한 연구)

  • Kim, Seonghwan;Cho, Sungsun;Lee, Junghwan
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.23 no.6
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    • pp.485-494
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    • 2013
  • This paper deals with experimental evaluation methods for high speed judder on the brake-caliper system. Firstly, two types of brake caliper systems due to the wheel vibration was evaluated. Secondly, the high-speed judder of the brake was also investigated using the subjective rating evaluation in the high-speed road test. These experimental evaluations were carried out by changing the materials of brake pad and the specifications of the brake-corner module. Based upon the test results, a new specification of the brake pad, $15{\times}5$ vertical chamfer, was proposed. The new brake pad showed 3 points, 60 %, improvement in the subjective-rating evaluation comparing with conventional one. Besides, we need to decide properly with judder characteristic of pad material and have to carefully take into consideration other design parameters; caliper, disc, and the braking performance, durability, squeal noise.

Sensitivity Correlations of Electrical Vehicle (전기 차량의 민감도 상관관계)

  • Lee, Jeong-Ick
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.18 no.4
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    • pp.337-347
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    • 2009
  • Generally, finite element models used in structural analysis have some uncertainties of the geometric dimensions, applied loads and boundary conditions, as well as in material properties due to the manufacturability of aluminum intensive body. Therefore, it is very important to refine or update a finite element model by correlating it with dynamic and static tests. The structural optimization problems of automotive body are considered for mechanical structures with initial stiffness due to preloading and in operation condition or manufacturing. As the mean compliance and deflection under preloading are chosen as the objective function and constraints, their sensitivities must be derived. The optimization problem is iteratively solved by a sequential convex approximation method in the commercial software. The design variables are corrected by the strain energy scale factor in the element levels. This paper presents an updated method based on the sensitivities of structural responses and the residual error vectors between experimental and simulation models.

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