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AIAA SciTech Forum

作者： Wang, Xiting He, Ai Chen, Zhixiong Earle, Jincen Hu, Zhongzhi Tsinghua Univ Inst Aero Engine Beijing 100084 Peoples R China AECC Hunan Aviat Powerplant Res Inst Zhuzhou 412002 Hunan Peoples R China

ISBN: (数字)9781624107115

ISBN: (纸本)9781624107115

In order to optimize the overall performance design and control algorithm of hydrogen-fueled aero-engines, it is necessary to develop a dynamic model that accurately reflects their characteristics. This study uses design point data of hydrogen-fueled turbojet engines and a limited amount of experiment data to construct a baseline model and an adaptive model. Firstly, based on the design point data, a baseline model is constructed using a component-level modeling method, and the physical properties of hydrogen combustion gas are corrected to improve the accuracy of the baseline model. Secondly, the dynamic characteristics of the hydrogen regulating valve are identified through experimental data, and the characteristics of this actuator are integrated into the model to more accurately reflect the dynamic characteristics of the hydrogen-fueled turbojet engine. Finally, based on the limited experimental data, the particle swarm optimization algorithm is used to select appropriate value of correction factors to improve the steady-state accuracy of the model. Validation results show that this method can quickly and effectively establish an accurate hydrogen-fueled aero-engine adaptive model based on limited experimental data. Under the same hydrogen flow rate, the maximum steady-state errors of speed and exhaust temperature are 2.35% and 2.07%, respectively.

关键词： Hydrogen Fuels Turbojet Engine Particle Swarm Optimization Combustion Instability Actuators Aircraft Engines control algorithm Dynamic Modelling Hydrogen Fuelled Aircraft Aviation

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A 20kHz 87.2dB SNDR 12.1μW NS SAR ADC Based on Quantization-Error-Matched RLSB-First algorithm 22

A 20kHz 87.2dB SNDR 12.1μW NS SAR ADC Based on Quantization...

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22nd IEEE Interregional NEWCAS Conference (NEWCAS)

作者： Zhang, Yunhui Wang, Zexin Zhao, Menglian Tan, Zhichao Zhejiang Univ Coll Informat Sci & Elect Engn Hangzhou 310027 Zhejiang Peoples R China

ISBN: (纸本)9798350361766;9798350361759

Most noise shaping (NS) SAR ADCs still use the same control algorithm as Nyquist SAR ADC. Noticing the slow-varying input under oversampling, this paper proposed a new algorithm named quantization-error-matched RLSB-first to improve the switching efficiency. Compared with the VCM-based algorithm, the proposed algorithm saves 87.3% switching power consumption in a 1st order NS SAR under an OSR of 25. Simulated under a 55nm CMOS process, the NS SAR ADC based on the proposed algorithm achieves an SNDR of 87.2dB with a 20kHz signal bandwidth. Operating at 2.8kS/s sampling rate, it consumes 12.1 mu W power, corresponding to a Schreier FoM of 179.4dB.

关键词： NS SAR ADC switching scheme control algorithm RLSB-first low power

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Rapid generation of backup trajectories for run-time assurance of vehicles and other dynamical systems

Rapid generation of backup trajectories for run-time assuran...

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AIAA SciTech Forum

作者： Alomar, Ibrahim Alfaadehl, Abdulaziz Feron, Eric Shageer, Hesham King Abdulaziz City Sci & Technol Ctr Excellence Aeronaut & Astronaut Riyadh 11442 Saudi Arabia King Abdullah Univ Sci & Technol Elect Comp & Mech Engn Thuwal 23955 Saudi Arabia King Abdulaziz City Sci & Technol Joint Ctr Excellence Program Riyadh 11442 Saudi Arabia

ISBN: (数字)9781624107115

ISBN: (纸本)9781624107115

The ability for agents to arbitrarily control a safety-critical vehicle system comes with the necessity for this system to feature a "flight envelope protection system," should the agent erroneously or deliberately drive the system into hazardous situations. This need is particularly true of systems evolving in environments containing obstacles, either physical or otherwise. The "flight envelope protection system" aims to take over the vehicle's guidance before collision with the obstacle is unavoidable. Also named run-time assurance, the system generates "safe exit trajectories" in real time. This work provides a novel solution approach that follows a two-step process: First, reference backup trajectories are generated, together with trajectory regulation control laws, using a comprehensive but possibly time-consuming and unreliable trajectory optimization software. Second, we generate backup trajectories in real time by activating the regulation loop of a neighboring reference trajectory and computing the resulting trajectory. Numerical examples illustrate the approach. The work builds upon that previously reported in [1].

关键词： Flight Envelope Protection Trajectory Optimization Computing Linear Quadratic Regulator control algorithm Black Box Air Traffic control Flight Envelope Numerical Simulation Collision Avoidance

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Smart Wireless Temperature Data Logger Using IEEE 802.15.4/ZigBee Protocol

Smart Wireless Temperature Data Logger Using IEEE 802.15.4/Z...

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IEEE Region 10 Conference (TENCON 2008)

作者： Sehgal, Vivek Kumar Nitin Chauhan, Durg Singh Sharma, Rohit Jaypee Univ Informat Technol Waknaghat Dept ECE Solan HP India Jaypee Univ Informat Technol Waknaghat Dept CSE & IT Solan HP India

ISBN: (纸本)9781424424085

This Paper proposed a portable wireless data acquisition system for temperature in real time process dynamics. Process variables (like temperature, pressure, flow, level) vary with time in certain applications and this variation should be recorded so that a control action can take place at a defined set point This paper proposes an 8 bit embedded platform for a sensor having a network interface using the 802.15.4, ZigBee protocol, that is specially designed for the sensors network. The ZigBee protocol is a wireless technology developed as an open global standard to address the unique needs of low-cost, low-power, wireless sensors network This wireless data logger senses and monitors the variations in the local temperature thereby transmits the data within the range to an assigned embedded processor based server. Received temperature is displayed on a local liquid crystal display (LCD) on assigned server and simultaneously on a computer.

关键词： Temperature Sensor Embedded controller ZigBee Protocol control algorithm

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Research of neural network controller based on FPGA

Research of neural network controller based on FPGA

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IEEE International Conference on Electronics, Communications and control (ICECC)

作者： Lv Baofeng Zhang Guoxiang Guo Jingyu Chen Dan Tianjin Univ Technol & Educ Automat & Elect Engn Coll Tianjin Peoples R China

ISBN: (纸本)9781457703218

This paper first introduces the characteristics of the neural network, and designs the neural network PID controller based on FPGA, and then designs the hardware structure of the whole temperature control system through the analysis of the serial communication FPGA, and finally the paper introduces the has software design and simulation for the temperature control system. The simulation results indicate that the neural network PID controller has a faster response speed and stronger anti-interference ability, and this system has stable performance and reliable operation, has the very good practical value.

关键词： FPGA PID controller the BP neural network control algorithm

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Comparison of MRAC and L1 Adaptive controllers for a Gimbaled Mini-Free Flyer

Comparison of MRAC and L1 Adaptive Controllers for a Gimbale...

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AIAA Science and Technology (SciTech) Forum and Exposition

作者： Verberne, Johannes A. Betancur, Yomary A. Rivera, Karina P. Coulter, Nolan Moncayo, Hever Embry Riddle Aeronaut Univ Dept Aerosp Engn Adv Dynam & Control Res Lab Daytona Beach FL 32114 USA

ISBN: (数字)9781624105784

ISBN: (纸本)9781624105784

Intelligent mini-flying robotic vehicles powered by cold gas jets that fall in the category of Extreme Access Flyers (EAF) have gained popularity in recent years due to their ability to potentially explore and extract resources from the rough and mainly inaccessible landscape of space bodies. One particular field of interest in these missions is the area of failure and disturbance rejection. These EAFs are subjected to many unique types of disturbances which would need to be rejected by the control laws. This paper focusses on the design, implementation, and comparison analysis of Direct Model Reference Adaptive controller (MRAC) augmentation and L1 Adaptive control application for attitude stability of a Gimbaled Mini-Free Flyer vehicle in the presence of uncertainties such as thruster swiveling angle lock and saturation failures within a simulation environment. The Gimbaled Mini-Free Flyer vehicle is controlled by a propulsion system in conjunction with a thrust vectoring actuation configuration. The proposed architecture includes Non-Linear Dynamic Inversion (NLDI) implemented as a baseline controller and augmented with the adaptive control laws. The robustness and performance of the control algorithms are analyzed in this paper and numerical simulations are provided showing acceptable tracking performance of the attitude angles under the presence of disturbances.

关键词： Model Reference Adaptive control Thrust Vector control Attitude Stabilization control algorithm Propulsion System Numerical Simulation Attitude Tracking Feedback Linearization Yaw Aerospace Engineering

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An algorithm for autonomous isolation of neurons in extracellular recordings

An algorithm for autonomous isolation of neurons in extracel...

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1st IEEE RAS-EMBS International Conference on Biomedical Robotics and Biomechatronics (BioRob 2006)

作者： Branchaud, Edward A. Burdick, Joel W. Andersen, Richard A. CALTECH Dept Engn Mech Pasadena CA 91125 USA CALTECH Dept Biol Pasadena CA 91125 USA

ISBN: (纸本)9781424400393

This paper describes novel multi-electrode systems that can autonomously position recording electrodes inside cortical tissue so as to isolate and then maintain optimal extracellular signal recording quality without human intervention. Autonomous microdrives can be used to improve the quality and efficiency of acute recordings that are needed for basic research in neurophysiology. They also offer the potential to increase the longevity and quality of chronic recordings and will serve as the front end of neuroprosthetic systems that aid the handicapped. We first describe the autonomous positioning algorithm, and its implementation as a finite state machine. We have deployed the algorithm on both conventional acute recording micro-drives and a novel miniature robot microdrive. Experimental results in monkey cortex are presented.

关键词： brain-machine interface neural recording control algorithm

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Simulation of two-channel bulk materials metering system 9

Simulation of two-channel bulk materials metering system

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9th International Conference of Information and Communiation Technologies (AICT)

作者： Erulanova, Aizhan Shadrin, Gennadii Arinova, Natalia Asangaliiev, Ielibek D Serikbaev East Kazakhstan State Tech Univ Fac Informat Technol & Power Engn Oskemen Kazakhstan D Serikbaev East Kazakhstan State Tech Univ Architectural & Civil Engn Dept Oskemen Kazakhstan

ISBN: (纸本)9781467368551

Object dynamics and disturbances compensation method synthesized a control algorithm for the dual-channel object. A mathematical model of the dual-channel control object with a transportation lag was created. A new efficient management system for the bulk material consumption was developed. Model investigations computer-aided and field tests implementing the proposed method were conducted.

关键词： control algorithm automatic continuous weight metering two-channel management system bulk material belt conveyor multivariable system

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A Manipulator Terminal Actuator controlled by Microcomputer

A Manipulator Terminal Actuator Controlled by Microcomputer

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International Conference on Emerging Materials and Mechanics Applications (ICEMMA 2012)

作者： Li Wenxing Xinxiang Univ Electromech Engn Coll Henanxingnag 451003 Peoples R China

In this paper, the terminal actuator of mechanical gripper is designed and calculated. Meanwhile, the computer control program flow chart is given.

ISBN: (纸本)9783037853788

In this paper, the terminal actuator of mechanical gripper is designed and calculated. Meanwhile, the computer control program flow chart is given.

关键词： Mechanical gripper control algorithm manipulator

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control strategy for a dual-axis sun tracker based on a radiometric cube to maximize the power output of the PV system

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EPJ PHOTOVOLTAICS 2023年 14卷 35-35页

作者： Andriamahefa, Mahery H. Bourdin, Vincent Mininger, Xavier Badosa, Jordi Parra, Johan Migan-Dubois, Anne Univ Paris Saclay Cent Supelec CNRS Lab Genie Elect & Elect Paris F-91192 Gif Sur Yvette France Sorbonne Univ CNRS Lab Genie Elect & Elect Paris F-75252 Paris France CNRS LISN Batiment 507Rue Belvedere F-91405 Orsay France Sorbonne Univ Ecole Polytech Ecole Normale Super ENS CNRSInst Pierre Simon Laplace IPSLIP ParisLab M F-91120 Palaiseau France

The use of solar energy as an energy source is essential to reduce greenhouse gas emissions. In a photovoltaic system, the use of a sun tracker can produce up to 40% more energy than a fixed system. However, it is important, especially in temperate climates, to have an effective control strategy that can adapt the movement of the solar tracker for all weather conditions. This work presents a new control strategy for a dual-axis sun tracker based on a radiometric cube with four photodiode sensors on its East, West, South and Zenith faces. The optimal direction that maximises the irradiance received by the sun tracker can be determined through the mathematical expression of the irradiances on the four faces of the cube, considering an isotropic model for the diffuse luminance of the sky. This new control strategy adjusts the movement of the solar tracker to an optimal position in all weather conditions. The proposed control strategy provides a 40.5% gain in energy output on a cloudy day compared to the standard chronometric sun tracking strategy. For periods of clear and highly variable sky, the difference between the two strategies is only 0.15% and 1%.

关键词： Solar tracking control algorithm photovoltaic radiometric cube

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