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检索条件"主题词=Control algorithms"

共 697 条记录，以下是351-360 订阅

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USP ACTIVE ABSORPTION WAVE BASIN: FROM CONCEPTION TO COMMISSIONING

USP ACTIVE ABSORPTION WAVE BASIN: FROM CONCEPTION TO COMMISS...

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29th ASME International Conference on Ocean, Offshore and Arctic Engineering

作者： de Mello, Pedro Cardozo Carneiro, Mario Luis Tannuri, Eduardo Aoun Nishimoto, Kazuo Univ Sao Paulo Sao Paulo Brazil

ISBN: (纸本)9780791849125

This paper presents the new active absorption wave basin constructed at the University of Sao Paulo (USP), in the Numerical Offshore Tank (TPN) Laboratory. The square (14m x 14m) tank is able to generate and absorb waves from 0.5Hz to 2.0Hz, by means of 148 active flap-type wavemakers. An independent mechanical system drives each flap by means of a 1HP servo-motor and a ball-screw based transmission system. A customized ultrasonic wave probe is installed in each flap, and is responsible for the measurement of wave elevation in the flap. These sensors do not require constant calibration, differently from the capacitive or resistive sensors normally used in similar tanks. A complex automation architecture was implemented, with 3 Programmable Logic Computers (PLC), and a low-level software is responsible for all the interlocks and maintenance functions of the tank. Furthermore, all the control algorithms for the generation and absorption are implemented using higher level software (MATLAB (R)/Simulink block diagrams). These algorithms calculate the motions of the wavemakers both to generate and absorb the required wave field by taking into account the layout of the flaps and the limits of wave generation. The experimental transfer function that relates the flap motion to the generated wave is used for the calculation of the motion of each flap. Absorption tests were conducted with a prototype wave generator in a 2D wave flume with regular waves. Two different algorithms were tested. The first one is the frequency domain method based on Maeda et al. (2004), in which the commanded variable is the motor velocity. Furthermore, the time domain algorithm proposed by Schaffer (1996) was also tested. It is based on a digital filter and uses the position of the motor as the commanded variable. Both algorithms have hydrodynamic feedback based on the measurement of surface elevation at each flap. The first algorithm needs an extensive test procedure to calibrate its control param

关键词： Servomotors Absorption Maintenance Ocean engineering Waves Screws Engines algorithms Filters Motors control algorithms Flumes Ultrasonic waves Computers Generators Computer software Sensors Engineering prototypes Calibration Reflectance Probes Transfer functions Feedback

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DESIGN AND RECONFIGURATION ALGORITHM OF HEXBOT: A MODULAR SELF-RECONFIGURABLE ROBOTIC SYSTEM

DESIGN AND RECONFIGURATION ALGORITHM OF HEXBOT: A MODULAR SE...

引用

ASME International Design Engineering Technical Conferences/Computers and Information in Engineering Conference

作者： Sadjadi, Hossein Mohareri, Omid Al-Jarrah, Mohammad Amin Assaleh, Khaled Amer Univ Sharjah Dept Mechatron Sharjah U Arab Emirates

ISBN: (纸本)9780791849002

This paper primarily addresses the design and implementation of a planar hexagonal Modular Self-Reconfigurable Robotic System (MSRRS) along with the construction of its reconfiguration path planner and control algorithm. A universal module is carefully designed to be in line with the common goals of MSRRS including homogeneity, cost-effectiveness, fast actuation and quick and strong connections. Although the implemented working prototype is both large and restricted to a planar geometry, it is designed such that its hardware and software can be scaled up in the number of units and down in unit size;similarly, the platform has the potential to be extended for 3D applications. The software infrastructure of this platform is designed in a way that different hierarchies for distributed control and communication can be implemented. The algorithmic design is based on a hierarchical multilayer approach, where upper layers decompose the problem into sub-problems solvable by lower layers. An optimal reconfiguration path planner is developed to minimize the number of module movements during the reconfiguration while enforcing collision avoidance and connectivity constraints in addition to taking into account the kinematic model of the platform. The core of the algorithm relies on a heuristic function and a Markov Decision Process (MDP) optimization to generate a near-optimal reconfiguration path planner and a control algorithm for HexBot shown in Figure 1, a lattice, homogenous, rigid, planar hexagonal MSRRS. Among several novel approaches incorporated in this system, multilayer nature of both hardware and software design provides openness, flexibility and ease of modification or adaptation for other platforms. In this approach each layer is dedicated to perform a specific task and can be modified or enhanced separately while keeping the remaining layers untouched.

关键词： Computer software control algorithms Collisions (Physics) algorithms Kinematics Hardware Software design Optimization Design Robotics Geometry Engineering prototypes Construction

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WHEEL TORQUE controlLER DEVELOPMENT USING A SIMPLIFIED TIRE MODEL FOR VEHICLE HANDLING ENHANCEMENT

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2nd Annual Dynamic Systems and control Conference (DSCC 2009)/Bath/ASME Symposium on Fluid Power and Motion control

作者： Adireddy, Ganesh Shim, Taehyun Rhode, Douglas Univ Michigan Dept Mech Engn Dearborn MI 48128 USA

ISBN: (纸本)9780791848920

A tire model is an essential element in the vehicle controller development and various complexities of tire models have been developed and used. It is highly desirable for the control systems to use a tire model that is computationally efficient and easy to implement in control algorithms while providing desired performance. In this paper, a wheel torque controller was developed using a non-linear predictive control theory 8 degree of freedom vehicle model, and a simplified nonlinear tire model in order to control the vehicle yaw rate and side slip angle. The performance of this controller was compared to that based on well known Magic Formula tire model. The effectiveness and limitations of the proposed controller were discussed through simulation.

关键词： control algorithms Simulation Tires Vehicles Torque control systems Wheels Predictive control control equipment Yaw Degrees of freedom

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Minimizing on-peak and off-peak demands for a thermal storage system - Forecast model analysis to predict next day daily average load and model application

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Proceedings of the ASME 4th International Conference on Energy Sustainability 2010

作者： Song, Li Joo, Ik-Seong Gunawan, Subroto Univ Oklahoma Norman OK 73019 USA

ISBN: (纸本)9780791843949

Thermal storage systems were originally designed to shift on-peak cooling production to off-peak cooling production to reduce on-peak electricity demand. Recently, however, the reduction of both on- and off-peak demands is becoming an exceedingly important issue. Reduction of on- and off-peak demands can also extend the life span and defer or eliminate the replacement of power transformers due to potential shortage of building power capacity caused by anticipated equipment load increases. Next day daily average electricity demand is a critical set point to operate chillers and associated pumps at the appropriate time For this paper, a mathematical analysis of the annual daily average cooling of a building was conducted, and three real-time building load forecasting models were developed a first-order autoregressive model, a random walk model, and a linear regression model. A comparison of results shows that the random walk model provides the best forecast. A complete control algorithm integrated with forecast model for a chiller plant including chillers, thermal storage system and pumping systems was developed to verify the feasibility of applying this algorithm in the building automation system. Application results are introduced in this paper as well.

关键词： control algorithms algorithms Load forecasting Thermal energy storage Mathematical analysis Cooling Pumps Regression models Stress Power transformers

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Numerical simulation of combustion processes and analysis of temperature field non-uniformity in GTE-65 gas turbine combustor

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ASME Turbo Expo 2010

作者： Tarasov, Dmitry Lebedev, Alexander Simin, Nikolay Grinevich, Viktor OJSC “Power Machines” Saint Petersburg Russia

ISBN: (纸本)9780791843970

Our company has tested annular combustion chamber, being one of main components of hot gas path for GTE-65 gas turbine in mid power class. In order to arrange gaseous fuel oxidation process a method of lean homogenized air-fuel mixture burning is realized in the combustor. The same type two-contour burner modules are installed on the combustor cap in two rows by 60 burners in a row (120 burners in all). To optimize control algorithm and confirm main performances a model compartment, representing 1/12 part (segment) of actual combustion chamber, was produced. The tests have been conducted with using GP "Ivchenko-Progress" and OJSC "Power Machines" test rigs on modes from ignition to full load. Stable firing mode and pollutant emissions have been determined and the liner temperature condition and temperature field unevenness have been checked. The combustor control algorithm was optimized. As a result of the conducted tests there were confirmed environmental requirements to the combustor NOx emissions (less than 25 ppm). Mathematical simulating machine was being used to predict the combustor operation performances at the gas turbine operating in field conditions. 3D numerical analysis was carried out to predict the temperature and NOx fields before the experiment preparation. In order to meet the numerical model with the test conditions after the experiment the boundary conditions were specified (fuel / air temperature and mass flow rate) Full and partial load calculations were performed for simulation and field operation conditions. The calculation results were compared with experimental data obtained in the course of bench test. Errors obtained by comparison with numerical and experimental data were as follows: full model pressure drop: similar to 3-4%;ratio of peripheral and radial nonuniformities of temperature fields: 2%;nitrogen oxides at various operation modes: maximum 25 ppm. The obtained results make it possible to go on the combustor testing in field condit

关键词： control algorithms Emissions Combustion Computer simulation Nitrogen oxides Combustion chambers Pollution Testing Errors Simulation Firing Flow (Dynamics) Oxidation Pressure drop Fuels Numerical analysis Ignition Gas turbines Machinery Temperature Boundary-value problems Stress

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controlLED SYNCHRONIZATION OF ROBOTIC MANIPULATORS IN THE TASK SPACE

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2nd Annual Dynamic Systems and control Conference (DSCC 2009)/Bath/ASME Symposium on Fluid Power and Motion control

作者： Liu, YenChen Chopra, Nikhil Univ Maryland Dept Mech Engn College Pk MD 20742 USA

ISBN: (纸本)9780791848920

Due to its practical applicability, recently several algorithms for robot synchronization have been developed in the literature. However, the focus of these control schemes has primarily been on joint-space control and in the absence of communication unreliabilities between the agents. In this paper, we study the problem of task space synchronization and trajectory tracking for heterogeneous robots under dynamic uncertainties. Exploiting passivity based synchronization results developed previously, a new control algorithm is proposed to guarantee task space synchronization for a group of robotic manipulators. Both non-redundant and redundant robots are considered and the proposed scheme is validated by a numerical example.

关键词： Synchronization Manipulators control algorithms algorithms Trajectories (Physics) Uncertainty Robots

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VEHICLE ROLLOVER DETECTION INDEX

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ASME International Mechanical Engineering Congress and Exposition

作者： Moshchuk, Nikolai Chen, Shih-Ken Gen Motors Corp Warren MI 48090 USA

ISBN: (纸本)9780791843864

Vehicle rollover resistance can be enhanced using differential braking control, rear-wheel steering, front steering control, suspension damping control, or the combination of any of them. In each control action, the controller receives the vehicle dynamics information from various sensors, such as a yaw-velocity sensor, a lateral accelerometer, a roll-velocity sensor (if available), and suspension displacement sensors (if available), and determines a control action to be taken. A balance between controlling vehicle roll motion and vehicle yaw motion needs to be reached to achieve the optimal vehicle response. Therefore, detection of the current and impending vehicle situations, especially pertaining to the vehicle roll, is vital for the quality of control. Various methodologies have been developed in the past to detect vehicle situations that may lead to rollover. Generally, rollover detection is based on roll velocity sensor and roll angle estimation. In most of these methods, thresholds for roll velocity and roll angle are established to detect imminent rollover. Even though roll velocity and roll angle are the two most important elements in vehicle roll motion, they may not be sufficient to timely detect impending rollover. This paper proposes a vehicle rollover detection index that can be used in a control algorithm to enhance vehicle rollover resistance. It uses roll angle and velocity (measured or estimated), yaw velocity, vehicle speed, and lateral acceleration. Further enhancement to the proposed algorithm is then briefly discussed that includes the effect of vehicle lateral load transfer on the detection.

关键词： Vehicle dynamics control algorithms algorithms Sensors Vehicles Braking control Displacement Accelerometers Wheels control equipment Stress Damping Yaw

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UNSTEADY LOADING OF ROTOR BLADES BY HIGH PRESSURE AIR INJECTION

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ASME International Mechanical Engineering Congress and Exposition

作者： Chi, John N. MIT Gas Turbine Lab Cambridge MA 02139 USA

ISBN: (纸本)9780791843833

A gas turbine engine consists of three primary components: a compressor, a combustion chamber, and a turbine. The operating range, performance, and reliability of gas turbine engines are limited by aerodynamic instabilities that occur in the compressor at low mass flow rates. Two of such compressor instabilities are rotating stall and surge. The stabilization of compression systems by means of active control has been demonstrated on several research compressors using different actuators such as inlet guide vanes, bleed valves, and air injection to manipulate the compressor flow field. This paper presents experimental and model simulated results of the steady and unsteady behaviors of air injection in high speed axial flow compressors that can be used for feasibility studies and control algorithm development. A control oriented model of the unsteady response of the transonic compressor blade rows to steady air injection is presented. This behavior was modeled by one-dimensional flow in a diffusing passage subject to a time varying inlet flow condition in the rotor relative reference frame. The one-dimensional model was then used to provide simplified input boundary conditions for a computational fluid dynamic (CFD) model that predicted aerodynamic loading on a transonic rotor blade due to steady air injection. The aerodynamic loading on a transonic rotor blade due to steady air injection were then simulated from the computational fluid dynamic (CFD) model. The simulation results for an evenly circumferentially spaced discrete number of jet actuators show that the fluctuating loading due to jet injection are non-sinusoidal and periodic. Total pressure, total temperature, and absolute flow angle survey measurements that map out the effect of high pressure air injection on a transonic compressor rotor for different levels of steady injection and different orientations are also presented.

关键词： control algorithms Simulation results Blades Combustion chambers Rotors Turbines Compression Reliability Computational fluid dynamics High pressure (Physics) Flow (Dynamics) Inlet guide vanes Surges Pressure Axial flow Gas turbines Compressors Temperature Valves Boundary-value problems Actuators

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Particle Swarm Optimization for Efficient Selection of Hybrid Electric Vehicle Design Parameters

Particle Swarm Optimization for Efficient Selection of Hybri...

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IEEE Energy Conversion Congress and Exposition (ECCE)

作者： Desai, Chirag Williamson, Sheldon S. Concordia Univ Power & Energy Res PEER Grp PD Ziogas Power Elect Lab Dept Elect & Comp Engn 1455 Maisonneuve Blvd W Montreal PQ H3G 1M8 Canada

ISBN: (纸本)9781424452873

It has been proven in literature that both the drivetrain as well as control strategy parameters have significant effects on the performance of hybrid electric vehicles (HEVs). A global optimization methodology based on particle swarm optimization (PSO) is presented in this paper for the parameter optimization of parallel hybrid electric drivetrain and control strategy simultaneously. The developed methodology aims at improvement in terms of fuel economy, without compromising driving performance. Simulation results show an improvement in the fuel economy, emissions, and overall drivetrain efficiency, which prove the potential of the optimization technique.

关键词： Battery control algorithms electric vehicles motor drives optimization

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Automated FPGA Implementation Methodology of PLC Programs with Floating Point Operations

Automated FPGA Implementation Methodology of PLC Programs wi...

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Economakos, Christoforos Economakos, George Koutras, Ioannis Halkis Inst Technol Dept Automat GR-34400 Psachna Evia Greece Natl Tech Univ Athens Sch ECE GR-15780 Athens Greece

ISBN: (纸本)9781424463916

Although the performance of traditional PLC technology is adequate for the majority of industrial automation and control tasks, there exist a number of demanding applications, which need more powerful alternatives. One such alternative, which has received considerable research interest in recent years, is the implementation of control algorithms on FPGAs. An inherent difficulty of this approach is that it requires expertise in both industrial automation and FPGAs. Also, FPGAs have been traditionally suited towards fast, fixed point calculations. This paper presents an automated methodology which addresses the first problem, by using language translators and hardware behavioral or high-level synthesis. For the second problem, different approaches to support floating point operations at the behavioral domain are thoroughly investigated. Overall, an efficient methodology for design space exploration of industrial control applications is proposed, using FPGA technology. The presented experiments show that design trade-offs can be easily explored and the desired solution for each application can be efficiently selected.

关键词： FPGA technology PLC programs PLC technology automated FPGA implementation methodology automated methodology behavioral domain control algorithms design space exploration field programmable gate arrays fixed point calculations floating point arithmetic floating point operations hardware behavioral synthesis high level synthesis high-level synthesis industrial automation industrial control industrial control applications industrial control tasks language translation language translators programmable controllers

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