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DERIVATION AND VALIDATION OF NONLINEAR GOVERNING EQUATIONS FOR THE ANALYSIS OF VEHICLE HANDLING
SungMo YANG,JoongHee KIM 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Nonlinear governing equations for the handling analysis of a ground vehicle are derived by the Lagrange equations of motion. The derived equations are coded using VBA (Visual Basic for Applications) embedded in Microsoft’s Excel Software and simulated in the time domain by the 4th-order Runge-Kutta method. A total six degrees of freedom in the equations are used: Three of these are the directional translation, lateral translation and yaw of a platform (unsprung) on the base of an inertial ground coordinate and the other three are the roll, pitch, and yaw of a body (sprung) by a platform-fixed coordinate. Four driving torques and four wheel angles of all tires are used as input control parameters. A simplified Calspan tire model is adopted for generalized forces of equations. This is a combined model which can obtain tractional (or braking) and side forces by the inputs of the directional and side slip ratios and the vertical force. The VBA code realized in this study is validated by comparisons with the static equilibrium results and the test data cited in published papers. The major characteristics of this paper are: (1) the coordinate systems of equations are mixed with the inertial frame and the platformfixed frame, and as a result almost all kinds of driving conditions with large mileages are possible to simulate (2) vertical movement is eliminated due to focusing on the handling analysis (3) the body-yaw dof is separated from the platform-yaw dof and (4) lastly, the programming is done by VBA, which is rarely used in the vehicle dynamics field.
Auto-Leveling of HID Headlamp Using Preview Control
Yang, Boojoong,Kang, Heeyong,Yang, Sungmo The Korean Society of Mechanical Engineers 2002 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.16 No.11
A newly developed high intensity discharge (HID) automotive headlamp results in a high luminous gradient at the cutoff line, and proves the superior concept in safer and more com-fortable nighttime driving. This new headlamp technology Provides drivers expanded night vision by a significantly improved light pattern. However, the HID headlamp may dazzle other traffics during traversing a rough road or encountering an unexpected bump. To resolve this problem, an automatic headlamp leveling device is necessary. A preview control is presented for the design of the leveling system. The proposed control algorithm is capable of attenuating a dynamic glare which is one of the major detractors to a driving in dark roads. Computer simulations using ADAMS are carried out to confirm the effectiveness on the control system.
양성모(Sungmo Yang),김근영(Keunyeong Kim),장원근(Eric Won Keun Chang),진상욱(Sangwook Jin),박기수(Gisu Park) 한국추진공학회 2018 한국추진공학회지 Vol.22 No.5
This paper summarizes the technical difficulties pertaining the double-compression ramp scramjet inlet model testing in a shock tunnel and their corresponding solutions. Four technical difficulties are identified: 1) test facility unstart, 2) flow disturbance and model damage due to the impact of diaphragm debris, 3) lack of fuel jet development due to multiple injection, and 4) short test time. After overcoming the identified technical difficulties, the improved results were confirmed through the results of shadowgraph images and shock tube end wall pressure.
[재료] 무기력계수 및 하중속도효과를 고려한 고장력강의 극한강도 특성
양성모(Sungmo Yang),강희용(Heeyong Kang),김하수(Hasu Kim),송준혁(Junhyuck Song),박정민(Jungmin Park) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_2
This paper introduces a method to predict the effect of loading speed of high tensile steel materials of automobiles. The method is based on the lethargy coefficient concept and dynamic/impact failure characteristics by the tensile test. The lethargy coefficient is obtained from the simple tensile test such as failure time and stresses at fracture. These factors not only affect the static strength but also have a great influence on the fatigue of the joint and the adjacent structures.<br/> The purpose of this paper is presented a rational method of predicting dynamic/impact tensile tests on high tensile steel materials widely used for structural material of automobiles. It is known that the ultimate strength is related with the loading speed and the lethargy coefficient from the tensile test. Then this is strength used to analyze the failure life prediction of mechanical system by virtue of its material fracture. The dynamic/impact tensile strength analysis is performed to evaluate the life parameters due to loading speed with a numerical example using the proposed method. Also the evaluation of the dynamic/impact effect on the material tensile strength characteristics is compared with the result of existing equation to verify the composed method.<br/>
양성모(SungMo Yang),김경환(Gyeonghwan Kim) 한국정보과학회 2007 한국정보과학회 학술발표논문집 Vol.34 No.2C
원영상과 목적영상 사이의 원근 변환(projective transform)에 의해서 생성되는 조감도 영상은 영상의 확대와 축소가 동시에 일어나는 특징을 가지고 있다. 조감도 영상을 구성하는 과정은 원영상의 위치에 따라서 원영상을 확대하거나 축소하여 목적영상을 만들어 내기 때문에, 원영상의 확대와 축소영역을 목적영상에 적합하게 나타내기 위한 보간법이 필요하다. 이중선형 보간법(bilinear interpolation)은 낮은 연산량 때문에 영상변환에 많이 사용되는 보간법이다. 하지만 영상의 확대와 축소 영역에서는 흐려지거나 에일리어싱(aliasing) 효과에 의한 아티팩트(artifact)가 일어나는 문제점을 가지고 있다. 이러한 문제점을 개선하기 위해서 고주파성분을 유지하는 에지(edge)정보 기반의 변형된 EWA를 사용 한다. 그리고 엔티에일리어싱(anti-aliasing)을 수행하는 MIP-mapping을 이용한 보간법을 통해서 축소 영역에서 발생하는 에일리어싱문제를 해결하여 조감도 영상의 화질을 개선한다.
고고도/실기체 환경 모사를 위한 건국대 초음속 풍동 가열 시스템 성능 개선
양성모(Sungmo Yang),김영주(Young Ju Kim),최원규(Won Kyu Choi),박수형(Soo Hyung Park),변영환(Yung Hwan Byun) 한국추진공학회 2017 한국추진공학회 학술대회논문집 Vol.2017 No.5
초음속 비행체 개발의 필요성이 증가됨에 따라 저고도에서부터 고고도까지 다양한 고공환경을 비행하는 비행체의 공력특성 데이터 확보가 요구되고 있다. 기존의 건국대학교 불어내기식 초음속 풍동(MAF)의 유동가열장치를 개선하여 고고도/실기체 환경 모사가 가능하도록 장비를 구축하였다. 본 장비를 활용하여 유도무기체계 및 초음속 비행체 선두부에 발생하는 유동과 그에 따른 온도 분포 및 속도 분포에 관하여 연구할 예정에 있다. As the necessity of development of supersonic vehicle increases, securing an aerodynamic data from low to high altitude is requested for flying vehicles crusing in various high-tech environment. Therefore our research team built equipment by improving heating device of Model Aerodynamic Facility(MAF) of Konkuk University to simualte a real gas environment. Guided weapon system and temperature and velocity distribution according to the flow that is produced from the pier of supersonic vehicle is planned to be researched by using this equipment.