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检索条件"主题词=Control Algorithm"

共 1200 条记录，以下是561-570 订阅

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Estimation of Time Intervals During Mobile Robot Digital control 10

Estimation of Time Intervals During Mobile Robot Digital Con...

引用

10th International Congress on Image and Signal Processing, BioMedical Engineering and Informatics (CISP-BMEI)

作者： Larkin, Eugene Kotov, Vladislav Kotova, Natalia Tula State Univ Ind Robot Dept Tula Russia

ISBN: (纸本)9781538619377

The analysis of a standard flowchart for a mobile robot digital control is performed. It is shown that the controller is a unit which introduces time disturbances in the process of control. A typical control algorithm and its model based on the semi-Markov process theory are worked out. The dependencies for evaluation of walk time through the states of an ergodic semi-Markov process are obtained. The reducibility of the semi-Markov process into the Markov process with a continual time is shown. The theoretical results are confirmed by simulation with use of the Monte-Carlo method.

关键词： Von-Neumann computer transaction control algorithm semi-Markov process walk time interval

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Abatement of a Multi-Rotor Tonal Noise Component with Phase control Technology 28

Abatement of a Multi-Rotor Tonal Noise Component with Phase ...

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28th AIAA/CEAS Aeroacoustics Conference

作者： Hertzman, Ofek Fligelman, Shir Stalnov, Oksana Technion Israel Inst Technol Fac Aerosp Engn IL-32000 Haifa Israel Technion Israel Inst Technol Fac Aerosp Engn Aeroacoust Lab Technion IL-32000 Haifa Israel

ISBN: (数字)9781624106644

ISBN: (纸本)9781624106644

The annoying sound produced by a multi-rotor vehicle can bring a severe acoustic nuisance to an urban soundscape. Hence, it is essential to find a solution to attenuate the acoustic signature of a multi-rotor platform for further development and acceptance of these vehicles by the public. In this paper, an attempt is made to apply a phase control technique to attenuate acoustic signature, and the feasibility and potential are explored through an experiment. Phase control is a noise reduction technique that leverages destructive interference of the coherent acoustic source field between a system of propellers. The measurements were conducted in the newly established anechoic chamber at the Faculty of Aerospace Engineering at the Technion - Israel Institute of Technology. An array of 15 microphones were placed 1.5m away from the center of a four-rotor rig on a spherical arc. The aerodynamic forces and moments were measured with load cells. Carefully selecting the relative azimuths blade angle (phase), the overall directivity and level of the tonal component at the blade passage frequency can be attenuated. It was found that with 90 degrees phase between neighboring rotors, a reduction of 8 dB and at 3000 RPM and by 5 dB at 4100 RPM was observed at theta = 45 degrees, in comparison to uncontrolled configuration.

关键词： Propeller Performance Aerodynamic Coefficients Anechoic Chambers Aerospace Engineering Sound Pressure Level Power Spectral Density control algorithm Data Acquisition Feedback Loop Wind Tunnels

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Fine tuning design of control board parameters for sensing applications

Fine tuning design of control board parameters for sensing a...

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23rd IEEE Instrumentation and Measurement Technology Conference

作者： Fort, A. Vignoli, V. Rocchi, S. Tondi, L. Serrano-Santos, M. B. Mugnaini, M. Univ Siena Dept Informat Engn Via Roma 56 I-53100 Siena Italy

ISBN: (纸本)9780780393592

The response of Metal Oxide Chemical sensors is highly sensitive to operating temperature, and it is well known that this temperature has to be controlled within few degrees. Moreover operating sensors with variable temperature allows enhancing chemical sensing system capabilities. In this paper a simple but highly flexible temperature control system for Metal Oxide conductive chemical sensors is presented and discussed.

关键词： electronic nose data acquisition control algorithm

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Half-Bridge Voltage Source Inverter control Development Using HIL System 21

Half-Bridge Voltage Source Inverter Control Development Usin...

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21st International Symposium on Power Electronics (Ee)

作者： Brandis, Andrej Pelin, Denis Topic, Danijel Knezevic, Goran Fac Elect Engn Comp Sci & Informat Technol Osijek Dept Electromech Engn Osijek Croatia Fac Elect Engn Comp Sci & Informat Technol Osijek Dept Power Engn Osijek Croatia

ISBN: (纸本)9781665401876

The paper deals with a HIL (Hardware In the Loop) system or so-called Rapid control Prototyping (RCP) tools, used in a single-phase half-bridge Voltage Source Inverter (VSI) control development. The control algorithm is developed for the ATMEL ATmega2560 microcontroller. The code is implemented to the microcontroller via Arduino development board. A control board mock-up is assembled for control algorithm validation. HIL system is used as an RCP tool for testing. Furthermore, the VSI model is done in a HIL Schematic Editor and HIL SCADA software environment. The system functionality is tested for two selected operation points. Waveforms are recorded, and the voltage spectrum analysis is performed via external low-voltage spectrum analyzer. The shortcomings of developed system are addressed and the solution for them is proposed.

关键词： hardware in the loop rapid control prototyping voltage source inverter control algorithm development board

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Inspection Planning control of Laser Guided Measurement Robot

Inspection Planning Control of Laser Guided Measurement Robo...

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7th World Congress on Intelligent control and Automation

作者： Liu, Wanli Qu, Xinghua Ouyang, Jianfei Yan, Yonggang Tianjin Univ State Key Lab Precis Measuring Technol & Instrume Tianjin 300072 Peoples R China Univ Henan Polytech Inst Precis Engn Henan 454000 Peoples R China

ISBN: (纸本)9781424421138

Laser tracking system (LTS) is a portable 3D large size coordinate measuring machines (CMM), it measures 3D coordinates with laser beam by following a spherically mounted retro-reflector (SMR) with the advantages of broad range, high speed and high accuracy. However, the current inspecting task of LTS is performed manually to move SMR along the different position on the surface of a given part and measured with the trial-and-error approach. In order to perform LTS more efficiently and automatically, this paper has developed a laser guided measurement robot (LGMR) based on a new theory "laser beam moving and SMR tracking" instead of the traditional method "SNM moving and laser beam tracking". A systematic control algorithm of generating optimal inspection planning based on CAD-directed model is proposed for LGMR to inspect free-form surfaces. The control algorithm not only generates the movement orientation, position and optimal distance for LGMR, but also a consistent and efficient inspection process that can avoid the unnecessary trials in manual operations and reduce inaccuracy and inconsistency due to different operators. The experiment result has demonstrated that the inspection planning control algorithm can be integrated to the LGMR and generated automated scanning process under automaticity and accuracy constraints.

关键词： Laser guided Measurement robot Inspection planning control algorithm

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A new-style dynamic var compensation control strategy

引用

3rd International Conference on Electric Utility Deregulation, Restructuring and Power Technologies

作者： Gong, Jinxia Lu, Jingjing Xie, Da Zhang, Yanchi Shanghai Jiao Tong Univ Dept Elect Engn Shanghai 200240 Peoples R China

ISBN: (纸本)9787564112493

A new dynamic reactive power compensation technique for dynamic var compensator is presented. This paper presents the DC capacitor voltage control strategy, the loss current variation control algorithm and a new reactive current calculating method. And the desired compensating current is compared with the measurement of output current in the hysteretic current feedback-loop. Based on the analysis, a newstyle dynamic var compensation control strategy is realized. It also analyzes the relationship between DC capacitor voltage variation characteristic and the active and reactive power flow between AC and DC sides. A novel dynamic var compensation prototype is developed. The experimental waveforms of the prototype show that this control algorithm has the expected compensating performance, demonstrating the validity of the design scheme proposed in this article.

关键词： control algorithm DC voltage control dynamic var compensation loss current reactive current simulation

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Model Predictive controller with Adaptive Neural Networks and Online State Estimation for Pitch Rate control of the Cessna Citation X

Model Predictive Controller with Adaptive Neural Networks an...

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AIAA SciTech Forum

作者： Andrianantara, Rojo Princy Ghazi, Georges Botez, Ruxandra Mihaela Ecole Technol Super ETS Lab Appl Res Act Controls Avion & AeroServoElast 1100 Notre Dame West Montreal PQ H3C 1K3 Canada

ISBN: (数字)9781624107115

ISBN: (纸本)9781624107115

This research presents a technique for designing an adaptive nonlinear controller for the pitch rate of the Cessna Citation X business jet aircraft. The proposed control algorithm includes 3 major components, namely a Model Predictive controller (MPC), an online state estimation, and an adaptive neural network controller. The estimation of the aircraft local dynamics is performed using Recursive Least Square (RLS) method. The RLS algorithm consists of an adaptive filter suited for state approximation which only requires states and control increments. The MPC controller consists of an optimization of the control trajectory over a given control, and predicted horizons. A constrained nonlinear optimization is fulfilled to solve the optimization problem, for which a quadratic cost function with respect to the control trajectory is minimized. Finally, an adaptive neural network is added, which compensates the errors in the state estimations and improves the overall performance of the controller. The neural network component consists of a single hidden layer feedforward neural network, for which the hyperparameters are updated online using backpropagation principle on the weights of the input and output layers. The simulation results showed that the proposed control algorithm was perfectly capable of tracking a given reference signal defining a desired flight dynamic for the pitch rate control. The flight controller was tested on 63 different flight conditions across the flight envelope of the Cessna Citation X, and demonstrated good adaptation performance. The control algorithm was then tested with different parameters of the controller elements, and very good performance was obtained for given reference signals on the pitch rate.

关键词： cessna citation X Feedforward Neural Network Proportional Integral Derivative control algorithm Mean Aerodynamic Chord Business Jets Aircrafts Adaptive Filter Aircraft Dynamics Calibrated Airspeed control Surfaces

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DC Brushless Motor control System Based on COMSOL and Simulink 20th

DC Brushless Motor Control System Based on COMSOL and Simuli...

引用

20th Chinese Intelligent Systems Conference

作者： Li, Pengfei Wang, Shouhao Lv, Bohan Li, Lin Mu, Peng Tao Beijing Inst Precis Mechatron & Controls Beijing 100076 Peoples R China Innovat Ctr Control Actuators Beijing 100076 Peoples R China

ISBN: (纸本)9789819786527;9789819786503;9789819786497

The electromagnetic, temperature rise, stress, and strain characteristics of motors are nonlinear and coupled with each other, and cannot be replaced by simple mathematical models. The physical characteristics of these motors themselves will affect the overall performance of the control system, especially the electromagnetic characteristics of the motors. The finite element model has parameterization function. Taking DC brushless motor as an example, it can parameterize the input parameters of stator slot number, rotor pole number, winding connection method, current value, and main size on the model, automatically update the model, and can be applied to different motor structures and size parameters. Develop an interface configuration method for COMSOL and Simulink, and implement a joint simulation model of finite element motion control system for motor systems based on COMSOL and Simulink. This system can add dynamic loads on the motor shaft, and study the results including transient and steady-state air gap flux density, armature winding flux, electromagnetic torque, winding voltage, current, etc.

关键词： COMSOL Simulink Virtual motor control system Finite element model control algorithm

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Automatic and Manual Differential Lock control in a Truck - Cornering 20

Automatic and Manual Differential Lock Control in a Truck - ...

引用

20th International Scientific Conference on Transport Means

作者： Kucera, P. Pistek, V. Brno Univ Technol Fac Mech Engn Inst Automot Engn Tech 2896 2 Brno 61669 Czech Republic

The paper deals with the creation of control algorithm for locking differential of the truck. This algorithm is based on assumptions of the ZF ADM system and it is created using software Simulink-Stateflow. The article describes the function of algorithm and its application to the computational model of vehicle with 6x6 drive. In conclusion, a simulation of driving manoeuvres is done to verify the functionality of the assembled control algorithm of the differential.

关键词： control algorithm Simulink Stateflow Computational Model of Vehicle Differential

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Integrated Cable Vibration control System using Wireless Sensors

Integrated Cable Vibration Control System using Wireless Sen...

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Conference on Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems

作者： Jeong, Seunghoo Cho, Soojin Sim, Sung-Han UNIST Sch Urban & Environm Engn Ulsan 44919 South Korea Univ Seoul Dept Civil Engn Seoul 02504 South Korea

ISBN: (数字)9781510608221

ISBN: (纸本)9781510608221

As the number of long-span bridges is increasing worldwide, maintaining their structural integrity and safety become an important issue. Because the stay cable is a critical member in most long-span bridges and vulnerable to wind-induced vibrations, vibration mitigation has been of interest both in academia and practice. While active and semi-active control schemes are known to be quite effective in vibration reduction compared to the passive control, requirements for equipment including data acquisition, control devices, and power supply prevent a widespread adoption in real-world applications. This study develops an integrated system for vibration control of stay-cables using wireless sensors implementing a semi-active control. Arduino, a low-cost single board system, is employed with a MEMS digital accelerometer and a Zigbee wireless communication module to build the wireless sensor. The magneto-rheological (MR) damper is selected as a damping device, controlled by an optimal control algorithm implemented on the Arduino sensing system. The developed integrated system is tested in a laboratory environment using a cable to demonstrate the effectiveness of the proposed system on vibration reduction. The proposed system is shown to reduce the vibration of stay-cables with low operating power effectively.

关键词： Stay-cables Cable vibration Arduino control algorithm Magneto-rheological (MR) damper

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