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A novel model of gravity challenge device

BIOMEDICAL SIGNAL PROCESSING AND control 2023年第1期85卷

作者： Altaie, Saifaldeen Alrawi, Amera Duan, Xuexin Tianjin Univ Sch Precis Instrument & Optoelect Engn Dept Med Phys Tianjin Peoples R China Univ Mosul Dept Biol Mosul Iraq Tianjin Univ Sch Precis Instrument & Optoelect Engn Tianjin Peoples R China

Gravity is omnipresent force on the Earth and all living things have evolved under the constant influence of gravity. Some organisms learned to take advantage of this force by using it as a reference in their motion. On the other hand, many studies in living organisms shown that microgravity has a significant effect not only on the systemic level but also on the cellular level. In this study, a new model has been designed for a device that simulates microgravity in outer space. The model is made of acrylic with precise geometric dimensions with capabilities of controlling it in terms of angular velocities for the outer and inner frames, the distance of the sample from the center of rotation, and the time of reversal of the direction of rotation which produces smooth geometric path of the gravity vector of the biological sample. Besides, the designed algorithm has the ability to display the average gravity value of the coordinates (x, y, z) and the total value of the average gravity (G total) in the form of a curved figure in an instantaneous manner. Moreover, this design contributes to reducing the effort and cost of conducting biological studies on living organisms in space and opening new horizons for sciences that deal with the effect of microgravity on living organisms.

关键词： 3D Cell culture Clinostat control algorithm Microgravity Partial gravity Kinematic acceleration

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DSP Implementation of Speed Quantity Neural Network Estimation of controlled Solid State Drive

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IFAC Proceedings Volumes 1997年第21期30卷 369-374页

作者： B. Dobrucký P. Chyla P. Balažovič R. Vanek Faculty of Electrical Engineering University of Žilina Slovak Republic Faculty of Management Science and Informatics University of Žilina Slovak Republic

The paper deals with a identification of solid state drive using three-layer artificial neural network realized by fixed point digital signal processor (DSP) of the type of TMS320C25 - 100 ns. Back propagation learning process has been done for speed quantity of slid state drive, consisting of separately excited DC motor fed by four quadrant converter (chopper) unit. The input and output signals were obtained by sigma-delta A/D and D/A converters including both anti-aliasing and digital filter blocks. Comparisons of carried-out real estimated- (by DSP), simulated- (by PC) and measured samples of output signal are given in the paper.

关键词： digital signal processor neural network control algorithm estimation solid state drive A/D conversion four quadrant converter

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Formation of Special Balance Mode for a Return Space Vehicle in Dynamics of Atmospheric Descent

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IFAC Proceedings Volumes 2004年第6期37卷 311-314页

作者： V.A. Afanasyev G.L. Degtyarev A.S. Meshchanov T.K. Sirazetdinov State Rocket Centre “Makeyev design bureau” (SRC) Tupolev Kazan State Technical University (KAI) Miass Kazan Russian Federation

A mathematical model is developed and analytical evaluations are made for angular revolutions of a (return space vehicle) RSV during formation of the stable balance equilibrium on large angles of attack without application of control moment. The special balance mode permits RSV to widen a touchdown area after orbital departure. Results obtained are of practical significance in designing of promising RSVs including reusable launch vehicles for servicing ISS and in development of program and algorithm software including an onboard control algorithm to orient the lift force in space.

关键词： reusable vehicle angular return atmospheric descent control algorithm stabilization angle of attack

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A Novel Index to Evaluate the Blood Glucose controllability of Type I Diabetic Patients

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IFAC Proceedings Volumes 2011年第1期44卷 14223-14228页

作者： Germán Campetelli Estanislao Musulin Marta S. Basualdo Alfredo Rigalli GIAIP-CIFASIS CONICET-UNR-UPCAM III Rosario SF 2000 Argentina UTN-FRRo Rosario SF 2000 Argentina UNR-FCEIA Rosario SF 2000 Argentina Laboratorio de Biología Ósea y Metabolismo Mineral Fac. de Cs. Médicas UNR-CONICET Rosario SF 2000 Argentina

Abstract The development of the Artificial Pancreas has been growing rapidly during the last 10 years with the advent of Glucose Monitoring Systems and insulin delivery pumps. Several works have appeared testing different control algorithms for defining the proper insulin dosage in type I diabetic patients, focused on driving them into a healthy range of blood glucose (BG) concentration. However, practically none of them has previously considered to quantify the inherent degree of difficulty in achieving normal glycaemic values. Hence, in this work a novel index, named Glucose controllability (GC), is presented using the parameters of simplified models and easily measurable patients data. It allows performing a certain classification procedure before the implementation of any control algorithm. To test this methodology, Predictive Functional control (PFC) is applied for insulin dosage computation. After that, through the well-known control Variability Grid Analysis (CVGA) plot, it is evaluated if the GC index is able to anticipate how “controllable” each diabetic person could be. The validation was performed with a database of 30 virtual type I diabetic patients. The final simulation results are shown here together with the conclusions and future works.

关键词： Artificial Pancreas Diabetes Mellitus control algorithm controllability safety index

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Research on controlled Volume Operation Method of Large-scale Water Transfer Canal

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Journal of Northeast Agricultural University(English Edition) 2011年第3期18卷 47-59页

作者： DING Zhiliang WANG Changde XU Duo XIAO Hua Changjiang Institute of Survey Planning Design and Research Wuhan 430010 China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University Wuhan 430072 China

The controlled volume method of operation is especially suitable for large-scale water delivery canal system with complex operation requirements. An operating simulation model based on the storage volume control method for multi-reach canal system in series was established. In allusion to the deficiency of existing controlled volume algorithm, the improved controlled volume algorithm of the whole canal pools was proposed, and the simulation results indicated that the storage volume and water level of each canal pool could be accurately controlled after the improved algorithm had been adopted. However, for some typical discharge demand operating conditions, if the previously mentioned algorithm was adopted, then it certainly would cause some unnecessary gate adjustments, and consequently the disturbed canal pools would be increased. Therefore, the idea of controlled volume operation method of continuous canal pools was proposed, and corresponding algorithm was designed. Through simulating practical project, the results indicated that the new controlled volume algorithm proposed for typical operating conditions could comparatively and obviously reduce the number of regulated check gates and disturb canal pools for some typical discharge demand operating conditions, thus the control efficiency of canal system could be improved.

关键词： canal operation controlled volume method of operation control algorithm simulation

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An experiment of automatic PMD compensation in 40-Gb/s RZ optical communication system

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激光与光电子学进展 2004年第5期2卷 262-264页

作者：席丽霞张晓光于丽周光涛张宏明张娜张建忠吴斌苑铁成姚敏玉杨伯君 Department of Physics School of Science Beijing University of Posts and Telecommunications Beijing 100876 Department of Electronic Engineering Tsinghua University Beijing 100084

An experiment of adaptive polarization mode dispersion (PMD) compensation for 40-Gb/s return-to-zero (RZ) optical communication system is reported. In the experiment, degree of polarization (DOP) is used as feedback signal and particle swarm optimization (PSO) method is adopted as logic control *** compensation time is about 200 ms, the compensated differential group delay (DGD) is up to 30 ps,and bit error rate (BER) of 10-9 is reached when PMD compensation is employed.

关键词： PMD compensation polarization mode dispersion particle swarm optimization differential group delay communication system control algorithm bit error rate

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A Horizontality Adjusting Study of the Earth Drill′s Platform

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International Journal of Plant Engineering and Management 2005年第2期10卷 77-81页

作者： HUChang-sheng ZHAOWei-min LIGui-xian FANJia-kun ShiWenjie SchoolofMechtronics HarbinIstituteofTechnologyHarbin150006P.R.China SchoolofMechtronics DaqingPetroleumUniversityDaqing163000P.R.China

A horizontality adjusting system of the earth drill's platform is designed todeal with the operation difficulty of the platform which appeared while the earth drill is *** proportional-impulse control to eliminate the over-adjustment andelectricity-hydraulic-proportional control to drive the adjusting mechanism are adopted in thesystem. The control scheme and control algorithm are introduced in detail. The software flow chartis given.

关键词： earth drill control algorithm horizontality adjustment of platform electricity-hydraulic-proportional control proportional- impulse control

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An optimal algorithm to assess the compliance with the T 2s requirement of Waste-to-Energy facilities

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Energy Procedia 2017年 120卷 317-324页

作者： Federico Viganò Francesco Magli Department of Energy – Politecnico di Milano Via R. Lambruschini 4/A Milan 20156 Italy Consorzio LEAP Via N. Bixio 27/C Piacenza 29121 Italy MatER (Materials and Energy from Refuse) Research Center c/o Consorzio LEAP

The gas resulting from the incineration of waste must be raised, after the last injection of combustion air, in a controlled and homogeneous fashion and even under the most unfavorable conditions, to a temperature of at least 850 °C for at least two seconds (Art. 50.2 Directive 2010/75/EU). This norm and its variations (i.e. 1,100 °C for 2 s if the chlorine content of the incinerated waste exceeds 1% by mass), called “T 2s requirement”, oblige all Waste-to-Energy (WtE) plant operators to monitor the post-combustion conditions and to turn on auxiliary burners in the occurrence of noncompliance with such a requirement. In a WtE boiler, the determination of the mean temperature reached by combustion gas in the post-combustion zone, after an ideal residence time of 2 s, is carried out by an algorithm implemented in the Distributed control System (DCS) of the plant. Currently, since many different algorithms are used, it appears that further investigation on this subject is required. This work considers, as a case study, an existing WtE boiler and, by means of a calibrated long-furnace model of the post-combustion zone, investigates all the possible operating conditions as well as their connections with the monitored variables. The most relevant influences on the T 2s temperature are highlighted and some control algorithms are proposed. The results so far obtained show that the T 2s is affected both by boiler load and gas-side fouling in the same way and for the same extent. Therefore, since gas-side fouling in the post-combustion zone is an uncontrollable variable, boiler load is not usable in as input variable of a reliable algorithm. Moreover, the results highlight the significant role that can be played in the algorithm for the estimation of the T 2s by the oxygen content in secondary flue gas.

关键词： Waste-to-Energy T 2s requirement temperature after two seconds suction pyrometer boiler model control algorithm

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Fault tolerant single-phase capacitor start capacitor run induction motor powered with cascaded multilevel quasi impedance source inverter

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JOURNAL OF ENGINEERING-JOE 2019年第17期2019卷 4036-4040页

作者： Rahman, Syed Meraj, Mohammad Iqbal, Atif Ben-Brahim, Lazhar Alammari, Rashid Abu-Rub, Haitham Qatar Univ Dept Elect Engn Doha Qatar Texas A&M Univ Dept Elect & Comp Engn Doha Qatar

In this study, the performance of fault tolerant single-phase capacitor start capacitor run induction motor powered using seven-level quasi-impedance source inverter (qZSI) is analysed. The seven-level inverter consists of three units of qZSI connected in cascade. When one of the qZSI module fails (due to semiconductor failure), the resultant rms voltage applied to the motor will be reduced by one-third. This leads to reduction in both mechanical speed and electromagnetic torque of the motor. To restore the performance of the motor to pre-fault condition, the voltage deficit must be compensated. In conventional CHB inverter, it is not possible to achieve the pre-fault voltage. However, in qZSI, it is possible to achieve required voltage boost by application of shoot through duty cycle. Here, voltage of other two healthy operating modules can be boosted to reach pre-fault inverter output voltage during post-fault condition. The maximum voltage boost achievable is limited by the maximum shoot-through duty cycle which is related with modulation index. To verify the concept, simulation results of single-phase capacitor-start capacitor-run induction motor with or without proposed control algorithm are discussed. Experimental results for the proposed algorithm with RL load are discussed.

关键词： machine control starting torque invertors fault tolerance induction motors velocity load (electric) electric impedance qZSI module pre-fault condition fault tolerant single-phase capacitor start capacitor run induction motor CHB inverter cascaded multilevel quasi impedance source inverter RL load control algorithm modulation index maximum shoot-through duty cycle rms voltage boost electromagnetic torque mechanical speed

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Adaptive Bolus Chasing Computed Tomography Angiography

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IFAC Proceedings Volumes 2008年第2期41卷 6648-6653页

作者： Er-Wei Bai Zhijun Cai Ge Wang Electrical and Computer Engineering The University of Iowa Iowa City IA 52242 USA VT-WFU School of Biomedical Eng. & Sci. Virginia Polytechnic Institute & State University Blacksburg VA 24061 USA

Synchronization of the contrast bolus peak and CT imaging aperture is a crucial issue for CTA. It effects the CTA imaging quality and the necessary amount of contrast dose. In this paper, we propose an optimal adaptive bolus chasing controller. The controller estimates and predicts the unknown two dimensional bolus density on line and then determines the optimal control actions. Tracking errors are mathematically quantified in terms of estimation errors. Simulation results on the actual patient data exhibit its superior performance to the current constant-speed method. Also, the preliminary experiments demonstrate the clinical feasibility.

关键词： adaptive control optimal control control algorithm medical systems Computed Tomography (CT) CT Angiography (CTA)

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