• 제목/요약/키워드: ABS algorithm

검색결과 49건 처리시간 0.03초

AN ABS ALGORITHM FOR SOLVING SINGULAR NONLINEAR SYSTEMS WITH RANK DEFECTS

  • Ge, Rendong;Xia, Zun-Quan
    • Journal of applied mathematics & informatics
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    • 제12권1_2호
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    • pp.1-20
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    • 2003
  • A modified ABS algorithm for solving a class of singular non-linear systems, $F(x) = 0, $F\;\in \;R^n$, constructed by combining the discreted ABS algorithm and a method of Hoy and Schwetlick (1990), is presented. The second differential operation of F at a point is not required to be calculated directly in this algorithm. Q-quadratic convergence of this algorithm is given.

AN ABS ALGORITHM FOR SOLVING SINGULAR NONLINEAR SYSTEMS WITH RANK ONE DEFECT

  • Ge, Ren-Dong;Xia, Zun-Quan
    • Journal of applied mathematics & informatics
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    • 제9권1호
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    • pp.167-183
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    • 2002
  • A modified discretization ABS algorithm for solving a class of singular nonlinear systems, F($\chi$)=0, where $\chi$, F $\in$ $R^n$, is presented, constructed by combining a discretization ABS algorithm arid a method of Hoy and Schwetlick (1990). The second order differential operation of F at a point is not required to be calculated directly in this algorithm. Q-quadratic convergence of this algorithm is given.

ABS ALGORITHMS FOR DIOPHANTINE LINEAR EQUATIONS AND INTEGER LP PROBLEMS

  • ZOU MEI FENG;XIA ZUN QUAN
    • Journal of applied mathematics & informatics
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    • 제17권1_2_3호
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    • pp.93-107
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    • 2005
  • Based on the recently developed ABS algorithm for solving linear Diophantine equations, we present a special ABS algorithm for solving such equations which is effective in computation and storage, not requiring the computation of the greatest common divisor. A class of equations always solvable in integers is identified. Using this result, we discuss the ILP problem with upper and lower bounds on the variables.

AN ABS-FRE ALGORITHM FOR SOLVING SYSTEMS OF FUZZY RELATION EQUATIONS

  • Xia, Zun-Quan;Guo, Fang-Fang
    • Journal of applied mathematics & informatics
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    • 제15권1_2호
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    • pp.285-297
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    • 2004
  • The general scheme of an algorithm, called an ABS-FRE algorithm, for solving systems of fuzzy relation equations (systems of FRE) via the ABS algorithms is presented. As special cases, two particular algorithms for obtaining the greatest and minimal solutions of systems of FRE are described. Several new operations used in this scheme are given, for instance, operators $\veebar$ and $\underline{\wedge}$ called quasi-inverses of operators $\vee$ and $\wedge$, respectively, etc.

ABS ALGORITHM FOR SOLVING A CLASS OF LINEAR DIOPHANTINE INEQUALITIES AND INTEGER LP PROBLEMS

  • Gao, Cheng-Zhi;Dong, Yu-Lin
    • Journal of applied mathematics & informatics
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    • 제26권1_2호
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    • pp.349-353
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    • 2008
  • Using the recently developed ABS algorithm for solving linear Diophantine equations we introduce an algorithm for solving a system of m linear integer inequalities in n variables, m $\leq$ n, with full rank coefficient matrix. We apply this result to solve linear integer programming problems with m $\leq$ n inequalities.

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Development of Brake System with ABS Function for Aircraft

  • Jeon, Jeong-Woo;Woo, Gui-Aee;Lee, Ki-Chang;Kim, Yong-Joo
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2003년도 ICCAS
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    • pp.423-427
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    • 2003
  • In this paper, it is to development of brake system with ABS function for aircraft. The test of brake system is required before applying on aircraft. The real-time dynamic simulator with 5-D.O.F. aircraft dynamic model is developed for braking performance test of ABS (Anti-skid Brake System) control h/w with anti-skid brake functions. The dynamic simulator is real-time interface system that is composed of dynamic simulation parts, master control parts, digital and analog in/out interface parts, and user interface parts. The 5-D.O.F. aircraft dynamic model is composed of a big contour and a little contour by simulation s/w. The big contour represents the interactions of forces in airframe, nose and main landing gear, and engines on the center of gravity. The little contour represents interactions of wheel, braking units, hydraulic units and a control unit. ABS control h/w unit with ABS control algorithm is also developed and is tested with simulator under the some conditions of gripping coefficient. We have known that ABS control h/w unit on wet or snowy runway as well as dry runway very well protects wheel skid.

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고성능/저전력 3D 기하 연산을 위한 오프라인 CORDIC 벡터회전 알고리즘 (Off-line CORDIC Vector Rotation Algorithm for High-Performance and Low-Power 3D Geometry Operations)

  • 김은옥;이정근;이정아
    • 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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    • 제14권8호
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    • pp.763-767
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    • 2008
  • 본 논문에서는 모바일 환경에서의 3D 그래픽 처리에 효과적인 고성능/저전력의 CORDIC 구조를 구성하기 위하여 각도 기반 검색(ABS)과 스케일링 효과를 고려한 검색(SCS)과 같은 두 가지 오프라인 벡터링 방법을 제안하고 이를 통해 연산의 반복횟수를 줄이는 알고리즘을 개발한다. ABS 알고리즘은 3차원 벡터를 두 각으로 표현하고 이를 검색의 기준으로 삼았고, SCS 알고리즘은 단위 벡터를 기준으로 하여 벡터 회전 시에 최소의 반복 연산만으로도 원하는 회전을 수행할 수 있는 최적의 기본각 회전 시퀀스를 오프라인으로 미리 검색하여 적용한다 본 논문에서 제안하는 ABS, SCS 알고리즘을 통해 지연을 각각 50% 감소시킬 수 있었으며, 이와 함께 voltage scaling 기술을 적용하여 전력 소모를 크게 감소시킬 수 있음을 논의한다.

브레이크HILS를 이용한 능동 요모멘트 제어 알고리즘의 평가 (Evaluation of A Direct Yaw Moment Control Algorithm by Brake Hardware-In-The -Loop Simulation)

  • 류제하;김호수
    • 한국자동차공학회논문집
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    • 제7권8호
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    • pp.172-179
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    • 1999
  • This paper presents a simple but effective DYC algorithm which enhances vehicle lateral stability by using an anti=lock brake system (ABS). In the proposed algorithm, only the front outer wheel is controlled during cornering maneuver instead of controlling all four wheels because the wheel has the largest role in DYC and it is easy and simple to control the only one wheel. An ABS Hardware - In -The -Loop Simulation ( HILS) system that may be used to realistically test real vehicle dynamic behavior in a lab is used for evaluating the proposed DYC algorithm in severe situations where a vehicle is destabilized without DYC . The HILS results show that the proposed DYC algorithm has the potential of maintaining vehicle stability in some dangerous situations.

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상용차용 ABS ECU의 성능분석을 위한 HILS 시스템 개발 (Development of HILS System for Performance Analysis of the ABS ECU for Commercial Vehicles)

  • 황돈하;이기창;전정우;김용주;조정목;조중선
    • 제어로봇시스템학회논문지
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    • 제8권10호
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    • pp.898-906
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    • 2002
  • Antilock Brake System (ABS) is designed to prevent wheels from being locked-up under emergency braking of a vehicle. Therefore it improves directional stability of the vehicle, shortens stopping distance, and enhances maneuvering during braking, regardless of road conditions. Hardware In-the-Loop Simulation (HILS) is an effective tool for design Performance evaluation and test of vehicle subsystems such as ABS, active suspension, and steering systems. This paper describes a HILS model for ABS/ ASR(Acceleration Slip Regulation) system applications. A fourteen degrees-of-freedom vehicle dynamics model is simulated in an alpha-chip processor board. The proposed HILS system is tested with a basic ABS control algorithm. The design and implementation of HILS system for the ABS ECU(Electronic Control Unit) development of commercial vehicle are presented. The results show that the proposed HILS system can be used to test the performance, stability, and reliability of a vehicle under braking.

A Study on the ECU and Control Algorithm of ABS for a Commercial Vehicle

  • Lee, Ki-Chang;Kim, Mun-Sub;Jeon, Jeong-Woo;Hwang, Don-Ha;Park, Doh-Young;Kim, Yong-Joo
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2001년도 ICCAS
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    • pp.166.1-166
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    • 2001
  • Anti-lock Braking System(ABS) is a device which prevents the wheels form locked up under emergency braking of a vehicle. So it helps the vehicle to maintain the steerability and shortens the braking distance by maintaining optimal frictional force during braking since the tire road slip is controlled in acceptable range. Recently, ABS is accepted as a standard equipment in vehicles, especially in commercial vehicles(bus and trucks). Commercial vehicles don´t use hydraulic lines but use pneumatic lines for braking system mostly. In this paper, ECU(Electronic Control Unit) for the anti-lock braking system of a commercial vehicle which is equipped with a full-air brake system and its control algorithms are presented. In this algorithm wheel speed acceleration flags and wheel slip flags are defined ...

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