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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),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.