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Aircraft Spin Recovery Using a Sliding-Mode controller

JOURNAL OF GUIDANCE control AND DYNAMICS 2010年第5期33卷 1675-1679页

作者： Rao, D. M. K. K. Venkateswara Sinha, Nandan Kumar Indian Inst Technol Dept Aerosp Engn Madras 600036 Tamil Nadu India Nanyang Technol Univ Sch Mech & Aerosp Engn Singapore 639798 Singapore

SPIN is an autorotational state of aircraft at high angles of attack characterized by large rotation rate in yaw when compared with rates in roll and pitch. In a typical spin, an aircraft rotates about its center of gravity and an axis perpendicular to Earth descending vertically at high speed following a downward corkscrew path [1]. It is one of the most dangerous phenomena encountered by many of the modern fighter aircraft required to fly in high-angle-of-attack flight regimes. Improper functioning of aerodynamic control surfaces during spin makes it difficult for the pilot to control the aircraft, leading to many a problem, such as spatial disorientation and uncontrolled motion, resulting in fatal accidents and subsequent loss of aircraft.

关键词： Aerodynamic Coefficients Angle of Attack control Surfaces Level Flight Nonlinear Dynamic Inversion control algorithm Sliding Mode control Aerospace Engineering Fighter Aircraft Aircraft Flight Dynamics

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Height control and failsafe algorithm for closed loop air suspension control system

Height control and failsafe algorithm for closed loop air su...

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International Conference on control, Automation and Systems

作者： Jang, Inseob Kim, Hyunsup Lee, Hyeongchul Han, Sangsoo Hanyang Univ Dept Elect Engn Seoul 133791 South Korea Hanyang Univ Dept Elect & Control Engn Seoul 133791 South Korea Hyundai Mobis Chassis Module Engn Dept Yongin Gyunggi Do South Korea

ISBN: (纸本)9788995003879

This paper presents the control and failsafe algorithm of the closed loop air suspension system on the basis of analyzing the air suspension system and understanding the vehicle dynamics. The control algorithm determines target heights from driving conditions and driver's commands and actuators including a compressor, two reversing valves, and four air spring valves to achieve the target heights. The failsafe algorithm determines the type of faults and enables appropriate failsafe actions depending on the type of faults. To verify suggested control and failsafe algorithm, the simulations and the vehicle tests are conducted.

关键词： air suspension air spring control algorithm matlab/simulink model based design rapid controller prototyping

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A Full-Period Generating Mode for Bearingless Switched Reluctance Generators

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IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY 2010年第3期20卷 1072-1076页

作者： Cao, Xin Deng, Zhiquan Nanjing Univ Aeronaut & Astronaut Aeropower Sci Tech Ctr Coll Automat Engn Nanjing 210016 Peoples R China

A bearingless switched reluctance generator (BSRG) is developed, which is operated in full-period generating mode. In the proposed 12/8 bearingless generator, two sets of windings are embedded in the stator. The coils of excitation winding wound on each stator pole are separately controlled, whereas the coils of generation winding are connected in series for each phase. To begin with, the voltage equations of the generator are built for the dynamic analysis model. Then, the mathematical model of radial force is derived for the control of the unbalanced magnetic force. Furthermore, a control algorithm is introduced to generate the required radial forces and output voltage. Finally, dynamic analysis results are included to verify the proposed analysis.

关键词： Bearingless motor control algorithm full-period generating mode radial force

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Adaptive Feedforward control for Gust Load Alleviation

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JOURNAL OF GUIDANCE control AND DYNAMICS 2010年第3期33卷 862-872页

作者： Zeng, Jie Moulin, Boris de Callafon, Raymond Brenner, Martin J. ZONA Technol Inc Scottsdale AZ 85258 USA Univ Calif San Diego La Jolla CA 92093 USA NASA Dryden Flight Res Ctr Edwards AFB CA 93523 USA

In this paper, an adaptive feedforward control framework is proposed for the suppression of aircraft structural vibrations induced by gust perturbations to increase the resilience of the flight control law in the presence of the aeroelastic/aeroservoelastic interactions. Currently, aircraft with nonadaptive control laws usually include roll-off or notch filters to avoid aeroelastic/aeroservoelastic interactions. However, if changes in the aircraft configuration are significant, the frequencies of the flexible modes of the aircraft may be shifted, and the notch filters could become totally ineffective. With the proposed approach, the flexible modes can be consistently estimated in real time via a proven system-identification algorithm. The identified flexible modes information is used in the proposed adaptive feedforward control algorithm to adjust the parametrization of the basis functions in a feedforward controller. Along with the recursive least-squares estimate, the feedforward controller is adjusted, and the structural vibration of the aircraft induced by the gust perturbation can be largely suppressed. An F/A-18 active aeroelastic wing aeroelastic model with gust perturbation based on the linear aeroelastic solver formulation is developed as a test bed to demonstrate the proposed adaptive feedforward control algorithm.

关键词： Adaptive control algorithm Aerodynamic Force Coefficients Aeroservoelastic Systems Vibration Suppression Aircraft Configurations control algorithm Active Aeroelastic Wing Flight control Law Frequency Response Functions Leading Edge Flap

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A Full-Period Generating Mode for Bearingless Switched Reluctance Generators

A Full-Period Generating Mode for Bearingless Switched Reluc...

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21st International Conference on Magnet Technology (MT-21)

作者： Cao, Xin Deng, Zhiquan Nanjing Univ Aeronaut & Astronaut Aeropower Sci Tech Ctr Coll Automat Engn Nanjing 210016 Peoples R China

关键词： Bearingless motor control algorithm full-period generating mode radial force

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Improving of STS algorithm to Detecting Voltage Unbalance in Low Voltage Distribution Networks

Improving of STS Algorithm to Detecting Voltage Unbalance in...

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36th Annual Conference of the IEEE Industrial-Electronics-Society (IECON)/4th IEEE International Conference on E-Learning in Industrial Electronics/IES Industry Forum

作者： Gholizad, Babak Niroo Syst Shomale Gharb Engn Co Naghadeh Iran

ISBN: (纸本)9781424452262

Thyristor-based static transfer switches (STS's) are feeding sensitive loads with two independent sources by monitoring voltage quality. STS is used in distribution networks to provide connection to alternate sources of ac power for critical loads when the main source fails. In distribution system sensitive loads are endangered by either voltage sag or voltage unbalance. Simulation results show that, the STS-2 of the IEEE benchmark [4] in voltage sag and transient conditions operates properly;but do not detect voltage un-balance. In this paper, operating of the STS-2 under unbalance distribution network - as a scenario to improve the power quality for a three-phase critical load in industrial areas - is discussed. This paper presents an improved algorithm to detecting voltage unbalance with the STS-2 based on the ratio of the negative and the positive sequences. Simulation is presented in the well known software ATP/EMTP. Also load and network parameters are based on the industrial network of the Naghadeh - Iran.

关键词： control algorithm Power Quality Static Transfer Switch Voltage Sag Voltage Unbalance

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Sensor Data Output Requirements for Smart Grid Applications

Sensor Data Output Requirements for Smart Grid Applications

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IEEE-Power-and-Energy-Society General Meeting

作者： Mak, Sioe T.

ISBN: (纸本)9781424483570

The Smart Grid concept is conceived as a means to optimize and to improve the reliability of the electric delivery system. The numerous and different types of information generated at the remote sites at a distribution network by sensors and smart meters coupled with a communication infrastructure and data base management system provide the means to generate useful control algorithms. However, control applications lend themselves for logical stratifications unique to the intended targets of control. Demand response has a rippling effect all the way to generation and to some extend to distribution assets performance. Distribution automation could be local to distribution circuits served by a medium voltage distribution substation. Fast transient phenomena, harmonics problems can be highly local, limited to a particular feeder or at a customer premises. Hence the data requirements for each of the control applications mentioned before can be quite different from each other. This paper tries to illustrate how the physical behavior of the electric energy delivery system dictates the requirements for data generated by he sensing devices to design algorithms for Smart Grid control applications.

关键词： Sensor output Smart Grid applications control algorithm

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Treadmill Motor Current Based Real-time Estimation of Anteroposterior Force during Gait

Treadmill Motor Current Based Real-time Estimation of Antero...

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32nd Annual International Conference of the IEEE Engineering-in-Medicine-and-Biology-Society (EMBC 10)

作者： Nakashima, Yasutaka Ohki, Eiichi Ando, Takeshi Kobayashi, Yo Fujie, Masakatsu G. Waseda Univ Grad Sch Adv Sci & Engn Tokyo 1698555 Japan Waseda Univ Fac Sci & Engn Tokyo Japan

ISBN: (纸本)9781424441242

We have been developing a new vehicle, "Tread-Walk2", which supports walking for elderly. A control algorithm to improve the operability has been constructed. As the first step, we accurately estimated the user's anteroposterior force from the motor current value without the force sensor. This method is to develop a new mechanical model that considers the friction forces of the treadmill and remove the modeled friction losses from the output. However, we need the vertical force in order to develop a mechanical model. Thus, we proposed the new method to estimate the vertical force without the force sensor. This paper describes the new method to approximate the waveforms of the vertical forces as square waves by adding the user's weight as a parameter to the stance phase. By comparing the estimated anteroposterior force using the new method with the measured one using the force plate, the waveform pattern of the estimated one was similar with that of the measured one in two young subjects whose physical characteristics were different. This showed that the proposed method might possibly be useful for estimating the anteroposterior force in real-time.

关键词： DC motors Tread-Walk 2 vehicle anteroposterior force biomedical equipment control algorithm elderly friction friction forces gait gait analysis geriatrics handicapped aids mechanical model motor current real-time estimation treadmill walking

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Study of control Strategy on Small Power Photovoltaic Grid-connected Generation System

Study of Control Strategy on Small Power Photovoltaic Grid-c...

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2010 International Conference on Intelligent Computing and Cognitive Informatics (ICICCI 2010)

作者： LIU Sujuan,JING Qiufeng Henan Zhengzhou Power Supply Company State Grid Zhengzhou ChinaYANG Hai-zhu Department of Electrical Engineering and Automation Henan Polytechnic Univ.Jiaozuo China

Photovoltaic(PV) grid-connected system is the development trend of photovoltaic *** to the PV grid-connected system characteristics,analyzes the PV grid-connected inverter control and maximum power point tracking(MPPT) control strategy based on two-stage power conversion architecture,proposed a novel MPPT control algorithm,presents the design of a photovoltaic gridconnected inverse system based on the digital signal processor *** experiment results verify that the system can track the maximum power point quickly,the grid-connected current wave achieves our need and the wave of grid-connected current has the same frequency and phase as the utility voltage.

关键词： photovoltaic grid-connected system maximum power point tracking control algorithm inverter

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A totally shared optical packet switch: Dimensioning, control algorithm and performance

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PHOTONIC NETWORK COMMUNICATIONS 2006年第2期11卷 173-185页

作者： Yang, JJ Zeng, QJ Ye, T Zhu, GL Shanghai Univ Elect Power Fac Comp & Informat Engn Shanghai 200090 Peoples R China Shanghai Jiao Tong Univ State Key Lab Fiber Opt Local Area Networks & Adv Shanghai 200030 Peoples R China Chinese Univ Hong Kong Dept Informat Engn Hong Kong Hong Kong Peoples R China

In this paper, a novel optical packet switch is proposed, which uses a set of shared fiber delay lines (FDLs) and a set of shared tunable wavelength converters (TWCs) to resolve optical packet contentions. In addition, two control algorithms, i.e., Fiber-First (FF) and Wavelength-First (WF), are proposed to schedule optical packets. Performance of the novel switch is evaluated by means of simulation experiments. Simulation results show that based on either of these two control algorithms, the switch can achieve super performance without employing a lot of FDLs and TWCs. Moreover, the performance of FF and WF is compared. Detail analyses are also given in this paper.

关键词： optical packet switching fiber delay line tunable wavelength converter control algorithm

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