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检索条件"主题词=Control Algorithm"

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Dynamic Geometry control for Robust Aerodynamic Shape Optimization

Dynamic Geometry Control for Robust Aerodynamic Shape Optimi...

引用

AIAA Aviation Forum and Exposition

作者： Streuber, Gregg M. Zingg, David W. Univ Toronto Inst Aerosp Studies Toronto ON M3H 5T6 Canada

ISBN: (数字)9781624106101

ISBN: (纸本)9781624106101

This work presents novel progressive and adaptive dynamic geometry control algorithms which seek to improve convergence and reduce userworkload by partially automating the design of effective geometry control systems for aerodynamic shape optimization. These algorithms function by beginning in a coarse design space and periodically refining the geometry control with additional design variables when objective improvement becomes asymptotic. When refinement is initiated, progressive geometry control moves through a pre-defined sequence of increasingly fine geometry control schemes, while the adaptive algorithm instead dynamically generates a refined search space. This is accomplished by generating a list of candidate refinements and ranking them based on the minimum of a constrained quadratic suboptimization problem which constitutes an estimate of the maximum objective reduction possible in each candidate search space. The accuracy of this method is first validated on two inviscid problems, after which the progressive and adaptive algorithms are applied to two common aerodynamic shape optimization problems based on the Reynolds-Averaged Navier-Stokes equations, the twist and section optimization of the common research model wing-only geometry, and the planform optimization of a hybrid wing-body aircraft. In both cases, the dynamic geometry control schemes are able to converge to lower drag, often with fewer optimization iterations, compared to the tested static schemes.

关键词： Aerodynamic Shape Optimization Reynolds Averaged Navier Stokes Adaptive algorithm control Systems control algorithm Broyden Fletcher Goldfarb Shanno Computational Fluid Dynamics Jetstream Adaptive control Lift Coefficient

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Automatic control of supplying the uninterrupted action loading machine at casual outside influence

Automatic control of supplying the uninterrupted action load...

引用

International Conference on Industrial Engineering (ICIE)

作者： Khazanovich, G. S. Otrokov, A. V. Breusov, A. N. Platov South Russian State Polytech Univ NPI Shakhty Inst Branch 1 Lenin Sq Shakhty Rostov Region Russia

ISBN: (纸本)9781510816879

The condition of the loading process research, working out the principles and installations of automatic control of supplying the loading machines with grabbing claws is considered. The experience of application of discrete control system with regulated upper and lower levels of turning in the adjusters of loading the grabbing part engines is based. The task of automatic control providing, with the consideration of occasional character of forming the load with the grabbing claws, the achievement of maximum productivity at keeping power and energy limits, is formulated. The necessary mathematical models and control algorithms, the peculiarity of which is preliminary modeling of the process, putting the results into the system of microprocessing control and consideration of deviations from the standard variant, are worked out. Using the offered system provides with the productivity increase up to 15 %, increasing the reliability and reducing labour capacity in the machine control. (C) 2015 The Authors. Published by Elsevier Ltd.

关键词： loading machine of uninterrupted action productivity of the machine automatic supply to the pile mechatronic system of control occasional character of loading to the drive maximum frequency of the drive switching on sensors of the main parameters defence from overloading turning in the adjuster of current level control algorithm

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MATALB & Internet Based Remote control Laboratory

MATALB & Internet Based Remote Control Laboratory

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21st Chinese control and Decision Conference

作者： Yao, Yuan Dai, Yaping Tian, Dezhen Zhang, Xin Beijing Inst Technol Coll Informat Sci & Technol Beijing 100081 Peoples R China

ISBN: (纸本)9781424427239

In order to help undergraduates to study automatic control theory, and provide a common experiment platform based Internet for postgraduates to do research on control algorithm, we built a novel MATLAB & Internet Based Remote control Laboratory (M_I_RCLAB). In the laboratory, Students can make use of M-language to do simulation experiments and demonstration practicality experiments of automatic control theory in browser. In addition, students can design their own controller and upload the controller to M_I_RCLAB to do the remote real-time control experiment. Examples of a cases study of uploading PID and LQR controller for remote real-time control inverted pendulum are shown in the paper.

关键词： MATLAB real-time control remote control control algorithm

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Reseach on control Strategy Based on p-q-r Theory for Four-leg Grid-connected Inverter

Reseach on Control Strategy Based on p-q-r Theory for Four-l...

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International Conference on Materials Science and Information Technology (MSIT 2011)

作者： Chen, Hongbing Zhang, Xing Hefei Univ Technol Sch Elect Engineer & Automat Hefei Peoples R China

ISBN: (纸本)9783037853191

The mathematical model for three-phase four-leg grid-connected inverter is modeled by the simplified p-q-r theory. The control strategy is proposed based on the characteristic of controlled variables. PI algorithm is adopted for variables of p axis and q axis, and PR algorithm is adopted for variable of r axis. The full design and analysis of the proposed control algorithms are given in this paper. Simulation results and experimental result show that quality of four-leg grid-connected inverter output current is higher, and effectiveness of the proposed control strategies is validated by all results.

关键词： Four-leg grid-connected inverter control algorithm Simplified p-q-r theory

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Electric vehicles utilization for peak demand control in modern distribution networks 18

Electric vehicles utilization for peak demand control in mod...

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18th International Symposium INFOTEH-JAHORINA (INFOTEH)

作者： Ivic, Dejan Durisic, Zeljko Univ Belgrade Sch Elect Engn Belgrade Serbia

ISBN: (纸本)9781538670736

Development of Electric Vehicles (EV) makes a huge step forward to complete transition from conventional fossil fuel driven vehicles to modern, renewable energy based vehicles. Integration of large capacity charging stations (CS), specially developed for plug-in electric vehicles, into smart grid concept of distribution system is analyzed in this paper. Electric vehicles are considered not only as controllable loads but also as significant resource for peak demand control. In that manner proposed optimization framework is developed and implemented using genetic algorithm. Proposed optimization procedure is tested on different case studies. Simulation results, together with proposed optimization framework and derived conclusions could serve as basis of different short-term planning studies or even for development of real time control algorithms.

关键词： electric vehicles charging stations demand control control algorithm optimization procedure genetic algorithm costs minimization

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control of Electromagnetic Valve Actuators Working Under External Effects of Revolution

Control of Electromagnetic Valve Actuators Working Under Ext...

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International Conference on Industrial Engineering, Applications and Manufacturing (ICIEAM)

作者： Bolshenko, I Gumme, A. Batishchev, D. Platov South Russian State Polytech Univ NPI Dept Electromech & Elect Devices Novocherkassk Russia

ISBN: (纸本)9781538643075

The article discuss algorithms for controlling electromagnetic actuators (EMAs) of a resonant type which are oriented at controlling the valves of units of autonomous transport systems and provide stable operation of the electromagnetic mechanism under vibration conditions. The feature of the proposed algorithms is the absence of specialized position sensors, speed or acceleration of the movable actuator element which excludes the existence of additional frictional forces in the mechanism, simplifies the design, increases the service life and reliability of EMAs in general. The algorithms are based on the interconnection of electrical processes taking place in the winding of the electromagnetic actuator with mechanical processes caused by the movement of the movable element of the magnetic system. The transient characteristic of the control signal in the coil of the electromagnet is presented, and a method for determining the duration of the time intervals and the rate of current change in real time for forming a transient characteristic of the control signal, under the condition of the minimum value of the final velocity of the valve, is considered. The efficiency of the application of the proposed control algorithms for the EMAs of the air pulse valve was tested experimentally on a test bench with an internal combustion engine. The test results showed that the application of the proposed algorithms allows to provide a final valve landing speed of less than 0.4 m/s and a switching time of about 3.6 ms under the external disturbance.

关键词： air pulse valve control algorithm electromagnetic actuator internal combustion engine

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Self-organizing Mobile Robots Swarm Movement control Simulation 13th

Self-organizing Mobile Robots Swarm Movement Control Simulat...

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13th International Conference on Swarm Intelligence (ICSI)

作者： Larkin, E., V Akimenko, T. A. Bogomolov, A., V Tula State Univ Tula 300012 Russia AI Burnasyan Fed Med Biophys Ctr FMBA Moscow Russia

ISBN: (纸本)9783031097263;9783031097263

The control principle of mobile robots, self-organized in convoy structure, is considered. It is shown that in this case a high autonomy of swarm operation may be achieved, due to such parameters of motion, as swarm azimuth angle and velocity of movement may be set only for the master robot, while slave robots follow master one at the pre-determined distance. The flowchart of the swarm control system is worked out, according which all slave robots measure their own deviation from the direction on previous swarm unit and distance till it, and actuate mechanics of the robot for zeroing azimuth angles difference and setting pre-determined distance. Mathematical models of the swarm, as the united object under control, and of the distributed Von Neumann controller, which closes control system, are worked out. It is shown, that characteristic equation of closed system have complex exponent at the left side, which is due to time delays, born by Von Neumann type controllers. Method of evaluation of time delays, based on semi-Markov simulation of control algorithm, is proposed. Theoretical results are confirmed by modeling the motion control of a convoy, including pair mobile robots.

关键词： Swarm Mobile robot Convoy Von Neumann control algorithm Closed control system Transfer function Delay Semi-Markov process

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Simulation and control lab development for power and energy management for NASA manned deep space missions 12

Simulation and control lab development for power and energy ...

引用

12th International Energy Conversion Engineering Conference, IECEC 2014

作者： McNelis, Anne M. Beach, Raymond F. Soeder, James F. McNelis, Nancy B. May, Ryan Dever, Timothy P. Trase, Larry NASA Glenn Research Center 21000 Brookpark Road ClevelandOH United States Vantage Partners LLC 3000 Aerospace Parkway ClevelandOH United States

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Solar Sailing Fundamentals with an Exploration of Trajectory control to Lunar Halo Orbit

Solar Sailing Fundamentals with an Exploration of Trajectory...

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AIAA Science and Technology Forum and Exposition (AIAA SciTech)

作者： Vance, Leonard D. Nallapu, Ravi Teja Thangavelautham, Jekanthan Univ Arizona Aerosp Engn Tucson AZ 85719 USA Univ Arizona Aerosp & Mech Engn Dept Tucson AZ 85719 USA

ISBN: (数字)9781624105951

ISBN: (纸本)9781624105951

This paper covers the basic physics of solar sailing and then explores practical guidance techniques for controlling solar sailing spacecraft on the earth-moon halo orbit entry manifolds expected to be used by NASA's Lunar Gateway. A four body (Sun, Earth, Moon, spacecraft) simulation is utilized to generate the resultant trajectory performance. Biases to the reference manifold trajectories are derived to center spacecraft acceleration capability within the limited solar sailing acceleration envelope, and improvements in performance are demonstrated.

关键词： Halo Orbit Solar Sail Moon Earth Solar Sail Spacecraft control algorithm Orbital Period Spacecraft Trajectories Aerospace Engineering Propellant

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Adaptive control of a Tendon-Driven Manipulator for the Capture of Non-Cooperative Space Targets

Adaptive Control of a Tendon-Driven Manipulator for the Capt...

引用

AIAA Science and Technology Forum and Exposition (AIAA SciTech)

作者： Kernot, Justin E. Ulrich, Steve Carleton Univ Dept Mech & Aerosp Engn 1125 Colonel By Dr Ottawa ON K1S 5B6 Canada

ISBN: (数字)9781624105951

ISBN: (纸本)9781624105951

Orbital debris in Earth orbit poses a threat to the future of spaceflight. To combat this issue, the rigid capture of these non-cooperative orbital targets is enabled through the use of dexterous robotic manipulators. This paper proposes a novel robotic mechanism for capture and active servicing missions on non-cooperative targets;specifically, a tendon-driven manipulator is developed in this work. The capture mechanism is a prototype symmetric two-link gripper driven by an open-ended cable-sheath transmission mechanism. Since the cable-sheath transmission mechanism is a non-linear time varying hysteretic system, two separate adaptive control strategies were compared against the open-loop and proportional-integral-derivative controlled performance of the closed-loop gripper. Specifically, an indirect control method and a direct L-1 controller are proposed. Experimental results demonstrate that the adaptive controllers show better tracking performance of a joint trajectory over the proportional-integral-derivative and uncontrolled cases, while the L-1 controller performs best under dynamic conditions, and the indirect controller performs best in steady state.

关键词： Special Purpose Dexterous Manipulator Proportional Integral Derivative control Orbital Debris Earth Hysteresis Loops control algorithm Inverse Kinematics Servomotors Front End Robotics Enabling Near Term Demonstration Bounded Input Bounded Output

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