Collection of Technical Papers. 35th Intersociety Energy Conversion Engineering Conference and Exhibit (IECEC) (Cat. No.00CH37022)最新文献

A novel start system for an aircraft auxiliary power unit 一种新型飞机辅助动力启动系统

Collection of Technical Papers. 35th Intersociety Energy Conversion Engineering Conference and Exhibit (IECEC) (Cat. No.00CH37022) Pub Date : 2000-10-31 DOI: 10.1109/IECEC.2000.870617

C. Anghel

{"title":"A novel start system for an aircraft auxiliary power unit","authors":"C. Anghel","doi":"10.1109/IECEC.2000.870617","DOIUrl":"https://doi.org/10.1109/IECEC.2000.870617","url":null,"abstract":"This paper describes the design and the main technical characteristics of a new start system for an aircraft auxiliary power unit (APU). By using the latest improvements in power electronics and microelectronics, this system eliminates the conventional DC starter by driving the generator installed on the APU as a motor to achieve the start. The developed start system eliminates one battery, dedicated for APU starting, the DC starter and its clutch assembly, while providing a faster start, assisting the APU acceleration up to 8,400 rpm (vs. 6,000 rpm provided by the DC starter). This new system extends the APU life by maintaining lower engine temperatures during start. The battery voltage control feature, that maintains this voltage at 18/20 VDC during start and the option of using AC power for start, to save battery power is another advantage over the classical DC. This new start system is installed in over 650 commercial airplanes and the operation in revenue service has proved its high reliability. Presently its MTBF is 600% higher than the time between overhauls (TBO) for the DC starter, while assuring an increased performance and safety in operation.","PeriodicalId":224191,"journal":{"name":"Collection of Technical Papers. 35th Intersociety Energy Conversion Engineering Conference and Exhibit (IECEC) (Cat. No.00CH37022)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114991021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 15

FLC based photovoltaic battery diesel hybrid system management and control 基于FLC的光伏电池柴油混合动力系统管理与控制

Collection of Technical Papers. 35th Intersociety Energy Conversion Engineering Conference and Exhibit (IECEC) (Cat. No.00CH37022) Pub Date : 2000-07-24 DOI: 10.1109/IECEC.2000.870969

M. Zahran, A. Hanafy, O. Mahgoub, M. Kamel

{"title":"FLC based photovoltaic battery diesel hybrid system management and control","authors":"M. Zahran, A. Hanafy, O. Mahgoub, M. Kamel","doi":"10.1109/IECEC.2000.870969","DOIUrl":"https://doi.org/10.1109/IECEC.2000.870969","url":null,"abstract":"A fuzzy control algorithm for a process control system embeds the intuition and experience of an operator, designer and researcher. The control does not need accurate mathematical model of a plant, and therefore, it suits well to a process where the model is unknown or ill defined. Fuzzy control also works well for a complex nonlinear multi-dimensional system, a system with a parameter variation problem, or where the sensor signals are not precise. Fuzzy logic is finding wide popularity in various applications that include management, economics and process control. In this paper, the basic configuration of the fuzzy logic controller (FLC) is introduced and the component functions are illustrated. The proposed block diagram of the PVBD (PV battery diesel) hybrid system control is configured. The system controller manipulated variable as well as the actuators are clearly defined where all the system disturbances are included in the proposed block diagram. The system operation algorithm as well as the FLC algorithm is introduced. The FLC input-variables membership functions as well as the output consequences are illustrated with their universe of discourses. The FLC is tested and simulated by fuzzy logic toolbox under MatLab using first order with delay time process model under variables input signals. The FLC is implemented in the 8051 series microcontroller based on the low level language (assembly) usage. The normalization of the input sensed signals, output commands as well as the signal conditioning circuits are developed and implemented.","PeriodicalId":224191,"journal":{"name":"Collection of Technical Papers. 35th Intersociety Energy Conversion Engineering Conference and Exhibit (IECEC) (Cat. No.00CH37022)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116650519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

Effect of a limit to the figure-of-merit on thermoelectric generation 限制对热电发电性能的影响

Collection of Technical Papers. 35th Intersociety Energy Conversion Engineering Conference and Exhibit (IECEC) (Cat. No.00CH37022) Pub Date : 2000-07-24 DOI: 10.1109/IECEC.2000.870646

D. Rowe, G. Min, V. Kuuletsov, A. Kaliazin

引用次数: 6

Effect of Fabri choking on the performance of two-phase jet pumps 法布里堵塞对两相喷射泵性能的影响

Collection of Technical Papers. 35th Intersociety Energy Conversion Engineering Conference and Exhibit (IECEC) (Cat. No.00CH37022) Pub Date : 2000-07-24 DOI: 10.1109/IECEC.2000.870930

W. Lear, S. Sherif, G. M. Parker

引用次数: 8

An analysis and procedure for determining space environmental sink temperatures with selected computational results 用选定的计算结果确定空间环境汇温度的分析和程序

Collection of Technical Papers. 35th Intersociety Energy Conversion Engineering Conference and Exhibit (IECEC) (Cat. No.00CH37022) Pub Date : 2000-07-24 DOI: 10.1109/IECEC.2000.870928

A. Juhasz

引用次数: 18

Integrated thin-film solar power system 集成薄膜太阳能发电系统

Collection of Technical Papers. 35th Intersociety Energy Conversion Engineering Conference and Exhibit (IECEC) (Cat. No.00CH37022) Pub Date : 2000-07-24 DOI: 10.1109/IECEC.2000.870627

R. Raffaelle, J. Harris, D. Hehemann, D. Scheiman, G. Rybicki, A. Hepp

{"title":"Integrated thin-film solar power system","authors":"R. Raffaelle, J. Harris, D. Hehemann, D. Scheiman, G. Rybicki, A. Hepp","doi":"10.1109/IECEC.2000.870627","DOIUrl":"https://doi.org/10.1109/IECEC.2000.870627","url":null,"abstract":"The need for small and lightweight modular power systems is growing rapidly as the space science community continues to move toward smaller and less costly spacecraft (e.g., nanosatellites). Thus the use of lightweight thin-film photovoltaic solar cell arrays for power generation is an attractive possibility. Thin-film lithium ion energy storage with its large power densities and long cycling lifetimes should also prove a valuable resource. The authors have been developing a thin-film device capable of both solar energy conversion and storage. This device combines a thin-film lithium polymer battery with a thin-film solar cell. In a typical satellite application, the solar cell would be used to provide power for the spacecraft and charge the battery during the illuminated portion of the orbit. The battery would then provide the necessary \"stay-alive\" power for the satellite when in eclipse. The deposition techniques the authors have been using to deposit the component films of this device are inherently scalable. Sectioning the solar cells, varying the series and parallel combinations of the batteries, and adjusting the overall size of the device can be used to fulfill a wide variety of power requirements. The authors discuss the device design and the electrical properties of the component films. The output of the thin-film solar cell under an AMO illumination and the cycling characteristics of the thin-film battery under a low-Earth orbit or LEO (e.g., 55 min. Illumination, 35 min. Eclipse) timing sequence will be presented.","PeriodicalId":224191,"journal":{"name":"Collection of Technical Papers. 35th Intersociety Energy Conversion Engineering Conference and Exhibit (IECEC) (Cat. No.00CH37022)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126134773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

System identification and control design of an alternative fuel engine for hybrid power generation 混合动力替代燃料发动机系统辨识与控制设计

Collection of Technical Papers. 35th Intersociety Energy Conversion Engineering Conference and Exhibit (IECEC) (Cat. No.00CH37022) Pub Date : 2000-07-24 DOI: 10.1109/IECEC.2000.870705

J. Bustamante, B. Diong, R. Wicker

引用次数: 2

Comparison of 1200 V silicon carbide Schottky diodes and silicon power diodes 1200 V碳化硅肖特基二极管与硅功率二极管的比较

Collection of Technical Papers. 35th Intersociety Energy Conversion Engineering Conference and Exhibit (IECEC) (Cat. No.00CH37022) Pub Date : 2000-07-24 DOI: 10.1109/IECEC.2000.870674

H. Chang, R. Gupta, C. Winterhalter, Edward Hanna

{"title":"Comparison of 1200 V silicon carbide Schottky diodes and silicon power diodes","authors":"H. Chang, R. Gupta, C. Winterhalter, Edward Hanna","doi":"10.1109/IECEC.2000.870674","DOIUrl":"https://doi.org/10.1109/IECEC.2000.870674","url":null,"abstract":"This paper describes the design and characterization of 1200 V silicon carbide (SiC) Schottky diodes using a p-n junction barrier to control the leakage current. A low forward voltage drop of 1.9 V at 150 A/cm/sup 2/ and a low leakage current of 300 /spl mu/A/cm/sup 2/ are demonstrated. We compare the performance of SiC Schottky diodes with the 1200 V silicon (Si) PiN diodes fabricated and optimized for military and commercial motor drive applications. The power loss and related voltage and current stress of the SiC Schottky diodes and Si PiN diodes are evaluated using a half-bridge test circuit. The static and dynamic characterization of 1200 V SiC Schottky diodes and Si PiN diodes is performed at 25/spl deg/C and 150/spl deg/C. The SiC Schottky diode exhibits a 30% reduction in the total power loss as compared to the state-of-the-art Si PiN diodes, mainly due to a negligible reverse recovery charge in the SiC Schottky diode, which is 20/spl times/ lower than state-of-the-art Si power diode. Furthermore, the SiC Schottky diode contributes to lowering the overall voltage and current stress by a factor of 6/spl times/ on the switches (in this case IGBTs are used) due to the superior reverse recovery performance of the SiC Schottky diode.","PeriodicalId":224191,"journal":{"name":"Collection of Technical Papers. 35th Intersociety Energy Conversion Engineering Conference and Exhibit (IECEC) (Cat. No.00CH37022)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128226231","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 18

Recent developments in aircraft emergency power 飞机应急电源的最新发展

Collection of Technical Papers. 35th Intersociety Energy Conversion Engineering Conference and Exhibit (IECEC) (Cat. No.00CH37022) Pub Date : 2000-07-24 DOI: 10.1109/IECEC.2000.870618

M. Koerner

{"title":"Recent developments in aircraft emergency power","authors":"M. Koerner","doi":"10.1109/IECEC.2000.870618","DOIUrl":"https://doi.org/10.1109/IECEC.2000.870618","url":null,"abstract":"Aircraft have become increasingly dependent on uninterrupted electric and hydraulic power for flight control. Aircraft have also become increasingly dependent on shaft power to assist with engine starting in the event of a flameout. The use of turbofan engines, fly-by-wire flight control systems, and less stable aircraft configurations has increased the need for emergency power systems. Several configurations of aircraft emergency power systems are currently in use. These include ram air turbines, bleed air driven power units and propellant power systems. The propellant power systems include stand-alone emergency power systems, emergency engine start systems, and integrated auxiliary and emergency power systems. Two fuels are currently used in emergency power systems: H-70 monopropellant and jet fuel and air bipropellant. H-70 systems are small and lightweight and have been used for many years. However, H-70 is toxic and requires special handling. Jet fuel and air are less toxic and easier to handle. Jet fuel and air bipropellant systems have been used in several emergency power applications. Four aircraft emergency power systems are described: the F-16 emergency power unit; the U-2 emergency start system; The F-2 emergency power system; and the F-22, integrated auxiliary and emergency power system.","PeriodicalId":224191,"journal":{"name":"Collection of Technical Papers. 35th Intersociety Energy Conversion Engineering Conference and Exhibit (IECEC) (Cat. No.00CH37022)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128243731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12

Design of dual use, high efficiency, 4H-SiC Schottky and MPS diodes 设计双用途，高效率，4H-SiC肖特基和MPS二极管

Collection of Technical Papers. 35th Intersociety Energy Conversion Engineering Conference and Exhibit (IECEC) (Cat. No.00CH37022) Pub Date : 2000-07-24 DOI: 10.1109/IECEC.2000.870676

C. Severt, A. Agarwal, R. Singh, S. Ryu, J. Palmour

{"title":"Design of dual use, high efficiency, 4H-SiC Schottky and MPS diodes","authors":"C. Severt, A. Agarwal, R. Singh, S. Ryu, J. Palmour","doi":"10.1109/IECEC.2000.870676","DOIUrl":"https://doi.org/10.1109/IECEC.2000.870676","url":null,"abstract":"The prime benefit of the SiC Schottky diode lies in its ability to switch fast (<50 ns) and with almost no reverse recovery charge. The incorporation of a SiC Schottky-type rectifier in typical power-electronic systems, such as motor drive circuits and switching power supplies, will virtually eliminate the switching losses. In the forward bias, Ti Schottky diode provides a forward current density of 100 A/cm/sup 2/ at a forward drop of 1.15 V, at room temperature. However, the low barrier height of Ti Schottky diode results in a very high room temperature leakage current density of 300 /spl mu/A/cm2 at 500 V. Furthermore, the leakage current becomes unacceptable at temperatures higher than 100/spl deg/C. A 4H-SiC merged PiN Schottky (MPS) diode uses interdigitated p/sup +/ regions between Schottky contacts to limit the electric field at the Schottky interface during the off-state operation of the device. It has a low on-state voltage drop and fast switching of a Schottky diode and offers a low off-state leakage current like the PiN diode. The on-state and off-state performance was optimized by analyzing the effect of adjacent p/sup +/ region width and spacing by 2D device simulations.","PeriodicalId":224191,"journal":{"name":"Collection of Technical Papers. 35th Intersociety Energy Conversion Engineering Conference and Exhibit (IECEC) (Cat. No.00CH37022)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128248558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5