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检索条件"任意字段=2009 ASME Dynamic Systems and Control Conference, DSCC2009"

共 371 条记录，以下是81-90 订阅

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ENABLING AIR-PATH systems FOR HOMOGENEOUS CHARGE COMPRESSION IGNITION (HCCI) ENGINE TRANSIENT control

引用

2nd Annual dynamic systems and control conference (dscc 2009)/Bath/asme Symposium on Fluid Power and Motion control

作者： Yan, Fengjun Wang, Junmin Ohio State Univ Dept Mech Engn Columbus OH 43210 USA

ISBN: (纸本)9780791848920

This paper explores the possibility of using a cost-effective air-path system that includes a dual-loop (exhaust gas recirculation) EGR and a (variable geometry turbocharger) VGT to achieve independent control of the main in-cylinder charge conditions (i.e. in-cylinder oxygen, inert gas amounts, and gas temperature at the intake valve closing) for HCCI engine combustion transient operation. An engine simulation model consisting of the air-path system and a HCCI combustion model was developed and synthesized to evaluate the control authority of the air-path system on the in-cylinder charge conditions as well as their effects on combustion. A variety of simulations unveiled that such an air-path system can enable independent control of the main in-cylinder charge conditions and active compensation of the effects of the wall temperature variations on HCCI combustion.

关键词： Engines Cylinders Simulation Exhaust gas recirculation Temperature Homogeneous charge compression ignition engines Turbochargers Valves Engineering simulation Combustion Oxygen Geometry Wall temperature Simulation models Transients (dynamics)

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GRAVITY POWERED LOCOMOTION AND ACTIVE control OF TWO SIMPLE systems

引用

2nd Annual dynamic systems and control conference (dscc 2009)/Bath/asme Symposium on Fluid Power and Motion control

作者： Tavakoli, Ali Hurmuzlu, Yildirim So Methodist Univ Dept Mech Engn Dallas TX 75205 USA

ISBN: (纸本)9780791848920

The goal of this research is to develop energetically efficient robots that can produce stable gait. One cannot ignore the promise of robots that can walk by using very little energy. Gravity powered bipeds provide ample proof that this is possible. It is conceivable that mechanisms that are much simpler than legged robots can also produce gravity powered locomotion. It is also plausible that one can get deeper understanding of the dynamics of such simple mechanisms. In addition, evolutionary biology tells us that one can learn a great deal by studying the hereditary traits of organisms that evolve over generations. Thus, we study a chain of mechanisms that span from the very simple to the progressively more complicated. Each member derived from the previous one by making well defined incremental changes. Hence, our goal is to generate a family of planar mechanisms, with members that can be as simple as a bouncing ball or as complex as a five link biped. This presentation will be the first step of this study.

关键词： Gravity (Force) dynamics (Mechanics) Chain Biology Robots

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ACTIVE VIBRATION CANCELLATION FOR TIRE ROAD FRICTION ESTIMATION

引用

2nd Annual dynamic systems and control conference (dscc 2009)/Bath/asme Symposium on Fluid Power and Motion control

作者： Erdogan, Gurkan Alexander, Lee Rajamani, Rajesh Univ Minnesota Dept Mech Engn Minneapolis MN 55455 USA

ISBN: (纸本)9780791848920

This paper focuses on the development and experimental evaluation of a novel adaptive feedforward vibration cancellation based friction estimation system. The friction estimation utilizes a small instrumented redundant wheel on the vehicle. Unlike other systems previously documented in literature, the developed system can provide a continuous measurement of the friction coefficient under all vehicle maneuvers, even when the longitudinal and lateral accelerations are both zero. A key challenge in the development of the estimation system is the need to remove the influence of vibrations and the influence of vehicle maneuvers from the measured signal of a force sensor An adaptive feedforward algorithm based on the use of accelerometer signals as reference inputs is developed. The parameters of the feedforward model estimated by the adaptive algorithm themselves serve to determine the value of the friction coefficient. Detailed experimental results are presented on a skid pad wherein the road surface changes from dry asphalt to ice.

关键词： Force sensors Pavement Algorithms Asphalt Tires Vehicles Signals Vibration Ice Accelerometers Wheels Roads Friction Feedforward control

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MODELING AND control OF A HIGH PRESSURE COMBINED AIR/FUEL INJECTION SYSTEM

引用

2nd Annual dynamic systems and control conference (dscc 2009)/Bath/asme Symposium on Fluid Power and Motion control

作者： Yong, Chao Barth, Eric J. Vanderbilt Univ Dept Mech Engn Nashville TN 37235 USA

ISBN: (纸本)9780791848920

A high pressure combined air-fuel injection system is designed and tested for an experimental free liquid-piston engine compressor The application discussed utilizes available high pressure air from the compressor's reservoir and high pressure fuel to mix and then inject into a combustion chamber This paper addresses the modeling, design and control for this particular high-pressure air-fuel injection system, which features an electronically controlled air/fuel ratio control scheme. This system consists of a fuel line and an air line, whose mass flow rates are restricted by metering valves. These two lines are connected to a common downstream tube where air and fuel are mixed. By controlling the upstream pressures and the orifice areas of the metering valves, desired A/F ratios can be achieved. The effectiveness of the proposed system is demonstrated by a lumped-parameter model in simulation and validated by experiments.

关键词： Engines High pressure (Physics) Flow (dynamics) Simulation Fuels Valves Modeling control modeling Reservoirs Design Pistons Combustion chambers Compressors

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MIMO SELF-SENSING control OF A PIEZOELECTRIC TUBE SCANNER

引用

2nd Annual dynamic systems and control conference (dscc 2009)/Bath/asme Symposium on Fluid Power and Motion control

作者： Kuiper, Stefan Schitter, Georg Delft Univ Technol Delft Ctr Syst & Control NL-2628 CD Delft Netherlands

ISBN: (纸本)9780791848920

Piezoelectric tube scanners are commonly used in Scanning Probe Microscopy (SPM) to provide the scanning motion of the tip or sample. Oscillations due to the weakly damped resonances of the scanner are a major source of image distortion in SPM-imaging. In this contribution, multiple input-multiple output (MIMO) self-sensing actuation of a piezoelectric tube scanner is presented, allowing to actively dampen the scanner oscillations. By connecting the tube scanner in a capacitive bridge-circuit, the piezoelectric tube is simultaneously used as a sensor and actuator In order to enable the use of low-order decentralized controllers, the cross-talk between both axes is reduced by compensating for the capacitive coupling. The MIMO self-sensing actuation allows to actively dampen the scanner's fundamental resonance by 18dB, while simultaneously reducing the resonance induced coupling by 30dB. Experimental results verify a significant reduction of the scanner oscillations in both positioning axes during fast scanning.

关键词： Resonance Sensors Imaging Scanning probe microscopy control equipment Actuators Oscillations Electric bridges

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AUTONOMOUS MOTION control OF A WHEEL LOADER

引用

2nd Annual dynamic systems and control conference (dscc 2009)/Bath/asme Symposium on Fluid Power and Motion control

作者： Ghabcheloo, Reza Hyvonen, Mika Uusisalo, Jarno Karhu, Otso Jara, Juha Huhtala, Kalevi Tampere Univ Technol Dept Intelligent Hydraul & Automat IHA FIN-33101 Tampere Finland

ISBN: (纸本)9780791848920

This paper addresses the problem of autonomous control of a hydraulically actuated articulated-frame-steering (AFS) mobile machine- a wheel loader. Our autonomous motion control system includes a mission planning graphical user interface, an improved odometry algorithm and a GPS device for navigation purposes, together with a model based path-following control strategy, and speed control. The test platform is a small prototype wheel loader based on Avant-635 whose hydraulic components are substituted by electrically controlled equivalents. System development and preliminary calibrations are done using GIMsim- an elaborated semi-empirical hardware-in-the-loop simulator. Some field experiments are presented that demonstrate satisfactory performance of the system at this stage. Further tunings are required to reach a desired performance.

关键词： Calibration Algorithms Machinery Hardware Navigation Wheels Motion control Engineering prototypes Graphical user interfaces

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controlLING AN AUTONOMOUS RACING VEHICLE: USING FEEDFORWARD AND FEEDBACK TO control STEERING AND SPEED

CONTROLLING AN AUTONOMOUS RACING VEHICLE: USING FEEDFORWARD ...

引用

2nd Annual dynamic systems and control conference (dscc 2009)/Bath/asme Symposium on Fluid Power and Motion control

作者： Kritayakirana, Krisada Gerdes, J. Christian Stanford Univ Dept Mech Engn Dynam Design Lab Stanford CA 94305 USA

ISBN: (纸本)9780791848920

This paper describes the algorithms used for controlling an autonomous vehicle that operates at the limits of tire adhesion. The controller is designed to imitate a racecar driver by using both feedforward and feedback to command the steering, throttle, and brakes of the vehicle. The feedforward steering is based on the vehicle handling diagram, while the lanekeeping steering feedback is added to ensure vehicle stability and reduces tracking errors caused by disturbances or modeling errors. The feedforward speed is estimated based on the available friction, while the proportional speed feedback is introduced to mimic a racecar driver modulating the speed to trim the vehicle orientation. Two different speed feedback designs based on lookahead error and heading error are compared. The experiments demonstrate the superiority of heading error feedback, which enables the vehicle to operate at its limits while maintaining minimal lateral and heading errors from the desired trajectory.

关键词： Feedforward control Friction control equipment Vehicles Errors Adhesion Brakes Modeling Trajectories (Physics) Algorithms Stability Tires Feedback

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A FLEXONIC MAGNETIC CAR FOR FERRO-STRUCTURAL HEALTH MONITORING

引用

2nd Annual dynamic systems and control conference (dscc 2009)/Bath/asme Symposium on Fluid Power and Motion control

作者： Guo, Jiajie Lee, Kok-Meng Zhu, Dapeng Wang, Yang Georgia Inst Technol Sch Mech Engn Atlanta GA 30332 USA

ISBN: (纸本)9780791848920

This paper presents a new magnetic car as a mobile sensor node for health monitoring and dynamic testing of large civil (ferromagnetic) structures. Unlike traditional car design where the distance between the front and rear wheel pairs is fixed, the electromagnetically driven compliant beam (connecting the front and rear axles) not only offers an effective means to negotiate corners and cross ridges of small dimensions when maneuvering on ferromagnetic surfaces, but also serves as a sensor attachment device. Specifically, this paper presents the design concept of a novel flexonic magnetic car incorporating compliant beams and permanent magnets, and a three-dimensional model for simulating the deformed shape of the compliant beam. The compliant beam that enables direct contact of the accelerometer with the measuring surface eliminating the dynamic effect of the sensor carriers has been validated with the experimental modal analysis for a frame structure. This represents a transformative change from the fixed spatial resolution provided by traditional static sensors.

关键词： dynamic testing (Materials) Sensors Dimensions Permanent magnets Resolution (Optics) dynamic testing (Engineering) Modal analysis Accelerometers Shapes Design Wheels Three-dimensional models Corners (Structural elements)

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A NOVEL AUTOMOTIVE TRANSMISSION CLUTCH control MECHANISM

引用

2nd Annual dynamic systems and control conference (dscc 2009)/Bath/asme Symposium on Fluid Power and Motion control

作者： Zulkefli, Mohd Azrin Mohd Song, Xingyong Sun, Zongxuan Miao, Hsu-Chiang Univ Minnesota Dept Mech Engn Minneapolis MN 55455 USA

ISBN: (纸本)9780791848920

Clutch fill control is critical for automotive transmission performance and fuel economy, including both automatic and hybrid transmissions. To ensure proper function of the transmission systems, it is important to have a precise and robust clutch fill process. Current clutch fill control is realized in an open loop fashion, due to the lack of a pressure or position sensor in the clutch chamber To improve the accuracy and robustness of this system, a new clutch control mechanism is proposed, which includes an internal feedback structure without a pressure or position sensor First, the design and working principles of the new mechanism are presented. Second, the advantages of the internal feedback mechanism are analyzed and shown to be superior to the traditional clutch fill mechanism. To this end, the dynamic model of the new mechanism is formulated. Through a series of simulations and case studies, the new clutch control mechanism is demonstrated to be effective, efficient, and robust for solving the clutch fill and engagement control problem.

关键词： Simulation Sensors Automotive transmissions Pressure Corporate average fuel economy Engineering simulation Design Robustness Feedback Fuel efficiency dynamic models

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LPV-BASED-METHOD AIMING AT A WIN-WIN SITUATION FOR ANALYTICAL control THEORIES AND INTELLIGENT OPTIMIZATION METHODOLOGIES

引用

2nd Annual dynamic systems and control conference (dscc 2009)/Bath/asme Symposium on Fluid Power and Motion control

作者： Hiramoto, Kazuhiko Akita Univ Dept Mech Engn Akita 0108502 Japan

ISBN: (纸本)9780791848920

A new collaborative control strategy between time varying design parameters in LPV plants and the feedback controllers is proposed in the present paper As the feedback control law the gain scheduling control scheme is adopted to guarantee the closed-loop L(2) gain performance against the variation of the time varying parameter in the control object. The gain-scheduling controller can be obtained in an analytical manner by solving LMIs. For the closed-loop system with the LPV plant and the gain scheduling controller Genetic algorithm (GA), known as a so-called intelligent optimization method, is applied to optimize the closed-loop response. The proposed control system has a complementary structure between the LMI-based analytical control strategy and the flexible intelligent control method that does not impair their advantages each other In this sense a win-win situation for the LMI-based gain scheduling control and the GA-based intelligent optimization is realized in the proposed approach. A simple simulation example is presented to show the effectiveness of the proposed method.

关键词： Closed loop systems Simulation Genetic algorithms Optimization Collaborative control control systems Design control equipment Gain scheduling Feedback

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