Relevant bibliographies by topics / Aviation electronics technician

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  1. Journal articles
  2. Books
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Aviation electronics technician'

Author: Grafiati
Published: 4 June 2021
Last updated: 5 February 2022

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Journal articles on the topic "Aviation electronics technician"

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Solomentse, Oleksandr, Tetyana Herasymenko, Olena Kozhokhina, Yuliia Petrova, and Maksym Zaliskyi. "EFFICIENCY OF OPERATIONAL DATA PROCESSING FOR RADIO ELECTRONIC EQUIPMENT." Aviation 23, no. 3 (January 17, 2020): 71–77. http://dx.doi.org/10.3846/aviation.2019.11849.

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The paper deals with the statistical data processing algorithms in operation system of radio electronic equipment. The main purpose is analysis of data processing algorithm efficiency according to the analytical calculations and simulation results. During radio electronic equipment operation failures are possible. These failures affect on the equipment’s technical condition that can deteriorate. In case of condition-based maintenance, it is necessary to detect the time moment of deterioration beginning. Therefore, in this paper the deterioration detection algorithm was developed according to Neyman-Pearson criterion with a fixed sample size. The initial data are times between failures of radio electronic equipment, and these data can be identified by the exponential probability density function. The step-function model was chosen for failure rate change description. To estimate efficiency the operating characteristic was calculated. The simulation based on Monte-Carlo method confirmed the correctness of theoretical calculations.
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Shalumov, Alexander Slavovich, Natalya Alexandrovna Shalumova, and Maxim Alexandrovich Shalumov. "ALGORITHM FOR MODELING MECHANICAL PROCESSES IN AVIATION ELECTRONICS, TAKING INTO ACCOUNT THE NONLINEARITY OF THE DAMPING PROPERTIES OF MATERIALS." Globus: technical sciences 7, no. 3(39) (August 19, 2021): 29–36. http://dx.doi.org/10.52013/2713-3079-39-3-4.

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The object of research is aviation electronics. The purpose of the work is to develop algorithms for modeling mechanical processes in aviation electronics for the subsequent implementation of a prototype of a software and methodological complex for creating digital twins of aviation electronics. The work was carried out under contract № 91GS1CTS10-D5/61789 dated September 23, 2020 on the provision of a grant for conducting research and development work on the topic «Development of a prototype of a software and methodological complex for creating digital twins of aviation electronics and its testing» with the Federal State budgetary institution «Fund for Assistance to the Development of Small Enterprises in the Scientific and Technical Sphere».
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Ivakin, Y. A., E. A. Frolova, A. G. Varzhapetyan, and V. M. Balashov. "SCIENTIFIC AND METHODOLOGICAL CONCEPT OF QUALITY MANAGEMENT OF INTERACTIVE ELECTRONIC TECHNICAL MANUALS FOR OPERATION AND REPAIR OF AVIATION TECHNOLOGY." Issues of radio electronics, no. 10 (October 20, 2018): 58–65. http://dx.doi.org/10.21778/2218-5453-2018-10-58-65.

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Quality management of interactive electronic technical manuals on the operation and repair of aviation equipment is considered as a sequential process of iterative procedures for evaluating and improving the quality of these information and software logistics support tools. The scientific novelty of the research is that the scientific and methodological concept of quality management of interactive electronic technical manuals for the operation and repair of aviation equipment through the application of a process approach to the life cycle of this type of technology makes it possible to develop a methodological apparatus for developing and improving interactive electronic means of supporting the maintenance of aviation equipment by systematization and rationalization of methods of increasing its effectiveness. The scientific and methodological concept of quality management of interactive electronic technical manuals on the operation and repair of aviation equipment is the logical basis for the development of a number of methodologies and practical recommendations for ensuring the quality of interactive electronic technical manuals of the appropriate class, rationalizing the technological process for their development and application, etc. The construct of the proposed scientific and methodological concept is a two-level representation of the quality of the interactive electronic technical manuals. Considering the connection between the capabilities of the software and technology platform for creating interactive electronic technical guides and content-representation capabilities for logistic support of operators, it seems rational to consider the quality of these software and information products at two levels of presentation: subject-logical and information-technology.
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Ivakin, Y. A., E. A. Frolova, V. A. Tushavin, and M. S. Smirnova. "METHOD OF LOGICAL SCHEMES OF SUBJECT CONTENT FOR QUALITY ASSURANCE OF DEVELOPED INTERACTIVE ELECTRONIC TECHNICAL MANUALS." Issues of radio electronics, no. 10 (October 20, 2018): 66–74. http://dx.doi.org/10.21778/2218-5453-2018-10-66-74.

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The determining value of the logicality of the presentation, relevance and visibility of the presentation of the subject content to ensure the quality of the developed interactive electronic technical manuals for the operation and repair of aviation equipment objectively requires the development of a methodological tool for monitoring and managing its consumer properties. As such, the method of logical schemes of subject content for technical systems, which are built on the basis of synthesis of recognition features, can serve. These schemes are a network description of the multilevel decomposition of complex samples of aviation technical systems in a rational sequence of their inspection, verification and development. The proposed method of ensuring the quality of the IET develops a qualitatively new level of development of the subject material for the operation and repair of aviation equipment for interactive electronic manuals by supplementing the scientific and methodological apparatus of such development with tools for its generalization and structuring as logical diagrams of the sequence of inspections (work).The method of logical schemes of subject content to ensure the quality of interactive electronic technical guides being developed includes: a method for synthesizing logical diagrams of the subject content of operation and repair of aviation equipment, the basic sequence of the stages of developing electronic content on the basis of logical diagrams of subject content; practical recommendations on the software implementation of electronic content in interactive electronic technical guides.
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Frolova, E. A., E. G. Semenova, Ya A. Ivakin, and M. S. Smirnova. "METHOD OF MULTIPARAMETRIC QUALITY ESTIMATION BASED ON SOFT COMPUTING." Issues of radio electronics 1, no. 7 (July 11, 2019): 25–30. http://dx.doi.org/10.21778/2218-5453-2019-7-25-30.

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The method of multi-level quality assessment of interactive electronic technical manuals for aeronautical engineering contains the main approaches and instrumental base for the implementation of a multi-parametric assessment of the quality of electronic content of these manuals. The purpose of assessing the quality of interactive electronic technical manuals for aviation equipment is to obtain a consolidated conclusion on the degree of satisfaction of the need to create interactive electronic technical manuals in the conditions of unclear initial data used for the assessment received from experts. The article shows that the quality assessment of interactive electronic technical manuals for the operation and repair of aviation equipment can be made on the basis of nonnumeric or soft measurements due to the fuzzy nature of the initial qualimetric data. Assessment of the compositional importance of simpler quality indicators of interactive electronic technical manuals consisting of more complex using significance ranks determined by soft computing methods makes it possible to take into account any fragmentary and fuzzy expert data on the comparative weight of individual indicators included in the summary ones.
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Adamski, Mirosław. "EFFECTIVENESS ANALYSIS OF UCAV USED IN MODERN MILITARY CONFLICTS." Aviation 24, no. 2 (July 8, 2020): 66–71. http://dx.doi.org/10.3846/aviation.2020.12144.

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Analysis of contemporary armed conflicts shows that UCAV (Unmanned Combat Air Vehicle) is finding an increasing range of combat applications. The present study deals with constructional characteristics, tactical and technical parameters, equipment with reconnaissance sensors, electronic warfare equipment, weaponry, economic coefficient, combat experience, possessed additional benefits, systems and technologies, performance and application options in combat operations. Two UCAV (MALE − Medium Altitude Long Endurance) classes were analyzed based on Heron, Heron TP, MQ-1B Predator, MQ-1C Gray Eagle, Wing Loong, CH-4B and newly introduced MQ-9 Reaper ER, MQ-9 Reaper, P.1HH HammerHead, Mantis and (HALE − High Altitude Long Endurance) Global Yabhon, Yabhon-United 40 to determine their optimal effectiveness in combat operations. The article presents a general methodology for assessing the tactical effectiveness of selected UAV classes that are or can be used in modern armed conflicts. It can be useful for potential interested parties when making decisions regarding the purchase or application of an appropriate UAV depending on the capabilities and conditions of the defense strategy of a given country.
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Jiang, Wei Wei, Jin Yan, He Yin, Xue Qiao Hou, and Liang Zhang. "Research on Integrated Data Environment for Aviation Equipments Based on Extensive Interactivity of IETMs." Applied Mechanics and Materials 401-403 (September 2013): 1964–67. http://dx.doi.org/10.4028/www.scientific.net/amm.401-403.1964.

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As a focus for the current research in the informatization field, Interactive Electronic Technical Manuals (IETMs) involve all kinds of activities relating to equipment support and diversified extensible interactive interfaces. By studying the interaction of IETMs for aviation equipments with other information systems, IETMs functions can be expanded in terms of maintenance aiding, training aiding and technical data management aiding. By creating an integrated data environment framework of IETMs for aviation equipments with Extensible Markup Language (XML) technology, an intermediate mode, the information exchange and sharing can be achieved between different data sources, and the supportability and supporting capability of aviation equipments can be improved.
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Frolova, E. A. "MULTILEVEL EVALUATION OF QUALITY INTERACTIVE ELECTRONIC TECHNICAL MANUALS FOR AVIATION TECHNOLOGY." Siberian Journal of Science and Technology 19, no. 4 (2018): 605–12. http://dx.doi.org/10.31772/2587-6066-2018-19-4-605-612.

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Sobczynski, Dariusz. "A CONCEPT OF A POWER ELECTRONIC CONVERTER FOR A BLDC MOTOR DRIVE SYSTEM IN AVIATION." Aviation 19, no. 1 (March 30, 2015): 36–39. http://dx.doi.org/10.3846/16487788.2015.1015294.

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Realisation of a high-speed drive using a BLDC motor, especially that of low and medium power and with rotational speed of up to 40 000 rpm designed for use in aviation appliances, became possible due to rapid progress in electronic power control technology. An increase of both capability and diversity of electronic power circuits results from the increase of semiconductor element voltage and current operational ranges simultaneously with the improvement of their dynamical parameters, as well as from application of up-to-date microprocessor and programmable circuits for control purposes. Choice of topology for a drive system to be used in aviation appliances, including the electronic power converter, is based on the following quality and economy-related criteria: single-phase supply and sinusoidal waveform of power network current; high efficiency and reliability; small overall dimensions; minimum number of semiconductor elements; and low price. Various technical solutions are possible here, concerning both the scope of the power circuit and the control system.
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Ковтун, Олена Віталіївна, Марина Леонідівна Пилипчук, Марина Володимирівна Рудіна, and Сергій Іванович Сидоренко. "AUDIOVISUAL MATERIAL AS A MEANS OF FORMING AVIATION SUBJECT MATTER COMPETENCE OF AVIATION TRANSLATION STUDENTS." Information Technologies and Learning Tools 83, no. 3 (June 25, 2021): 176–91. http://dx.doi.org/10.33407/itlt.v83i3.4190.

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The paper researches the use of audiovisual material for formation of aviation subject matter competence of aviation translation students. The research involved a pedagogical experiment aimed at the verification of the hypothesis that systemic use of content-oriented audiovisual material accompanied by a specifically developed complex of training activities enhances students’ knowledge of the professionally relevant subject matter and skills in adequate use of aviation terminology and technical language, which visibly improves students’ professional competence as future translators in the aviation industry. The conducted experiment yielded positive results and confirmed the research hypothesis. As a result of the experimental teaching, the students showed better skills in using aviation terminology, abbreviations and concepts, higher lexicographic awareness, improved their ability to adequately use electronic and printed reference materials when translating aviation texts and to perform translation/interpreting in conformity with grammar, semantic and stylistic norms of radiotelephony communication and aviation standards. The experiment gave convincing evidence that audiovisual material combined with specially designed activities facilitates the formation of the aviation subject matter competence of aviation translation students, which is the basis for their successful professional performance. The audiovisual material and the training activities proved to be effective teaching tools in the framework of a content-oriented structure of aviation translation students’ aviation subject matter competence which was developed by the authors. Though the experimental teaching was done in the course on English-Ukrainian and Ukrainian-English aviation translation, the research results may surely be of relevance for other language pairs as well.
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Books on the topic "Aviation electronics technician"

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Senkbeil, Richard F. Aviation electronics technician 1 (organizational). [Pensacola, Fla.]: The Activity, 1993.

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Avionics technician. Ann Arbor, Mich: Cherry Lake Pub., 2012.

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Whitaker, Dennis A. Avionics technician (AQ/AT/AX) 3 & 2. [Pensacola, Fla.]: Naval Education and Training Command, 1986.

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FEDERAL AVIATION ADMINISTRATION. Electronics and environmental technicians. [Washington, D.C.?]: Federal Aviation Administration, 1990.

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FEDERAL AVIATION ADMINISTRATION. Electronics and environmental technicians. [Washington, D.C.?]: Federal Aviation Administration, 1990.

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Electronics and environmental technicians. [Washington, D.C.?]: Federal Aviation Administration, 1990.

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Beasley, Donald R. Aviation electrician's mate 1 & C. [Pensacola, Fla.]: The Center, 1985.

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Urlichich, I︠U︡ M. Mnogoplanovye inzhenerno-fizicheskie issledovanii︠a︡ ėlektronnoĭ komponentnoĭ bazy dli︠a︡ kosmosa (MIFI ĖKB). Moskva: MAKS Press, 2005.

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Aviation electronics technician (AT). [Washington, D.C.?: Dept. of Transportation, Coast Guard, 1992.

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Government, including air traffic controllers, aviation safety inspectors, airspace systems inspection pilots, accident investigators, electronics technicians, engineers, meteorologists. [Washington, D.C.?]: U.S. Dept. of Transportation, Federal Aviation Administration, Office of Public Affairs, Aviation Education, 1989.

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Book chapters on the topic "Aviation electronics technician"

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Meng, Fei, Jien Yang, Hang Xu, and Xiaolei Li. "The Technical Research of PHM in Aeronautical Mechanical and Electronical System Based on IETM." In Proceedings of the First Symposium on Aviation Maintenance and Management-Volume I, 133–39. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-54236-7_15.

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Conference papers on the topic "Aviation electronics technician"

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Duco, Stanislav, David Megyesi, Robert Breda, Martin Schrotter, Jakub Lesko, Robert Rozenberg, Danijel Vukovic, and Helia Nemethova. "Electronic Education in Aviation Technical Personnel Education." In 2020 5th International Conference on Smart and Sustainable Technologies (SpliTech). IEEE, 2020. http://dx.doi.org/10.23919/splitech49282.2020.9243834.

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Simonov, Vladimir L. "Optoelectronic Vibration Measurement System." In ASME 2003 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/detc2003/vib-48608.

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During mechanical testing in many cases it is necessary to measure real oscillations of the objects themselves, or their parts. In such cases a method can be used, which uses optical image of the object. When the object oscillates and there is optical visibility of the object’s surface, nearly always one can form an optical image of contrast part of the object. If the object oscillates mainly in the plane which is perpendicular to the axis of optical visibility, then it is possible to measure displacements of this image. For these measurements a special optoelectronic system was designed. This paper describes the results of investigations and creation of a model of such optoelectronic system. This particular model was designed especially for vibration measurements of some hardly-accessible parts of aviation devices: turbine coolers, overheated parts of aviation engines from some distance (several meters). During investigations it was revealed, that system’s applications are much wider than the ones used at the beginning. So in this paper also presented are results of measurements of the system for aviation engine blades; for rotors’ balancing; for vibration testing of aviation turbine coolers; for vibration measurements of elements of printed circuit boards in electronic devices; for various parts of constructions; for acoustic loudspeakers; for active objects (which emit light themselves); in automobile industry; for distant measurements (hundreds of meters); and for some medical applications. The main problem during system design was to eliminate errors of measurements. These errors took place because various objects have different size and shape, and they emit or reflect different amount of light. Without compensation the total error would be about hundreds of percent. So all errors were analyzed, classified, mathematically modeled and created were special loops for errors compensation. As a result total error of measurement was less that 15% for all conditions of use. The system has build-in block for self-testing. During design it was provided that the system can be applied for indoor and outdoor conditions. Special climatic testing have confirmed that.
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Rendon, Manuel A., Konstantinos Kyprianidis, Yipsy Roque Benito, Daniel de A. Fernandes, Ariele T. Ferraz, and Luan R. C. Vieira. "Energy Management of a Hybrid-Electric Aeronautical Propulsion System to Be Used in a Stationary Test Bench." In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-16133.

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Abstract Environmental requirements have led the air transportation industry to work towards reducing greenhouse gas emissions and mechanical noise levels. Nowadays, this sector contributes with 2% of the total greenhouse gas emissions, and there is a demand from global aviation regulators for further reducing this percentage. In the last years, the development of Hybrid-Electric Propulsion Systems (HEPSs) has grown. The HEPS combines an Internal Combustion Engine (ICE), for example, Gas Turbine (GT) or reciprocating engine, with an Electric Motor (EM), combining the inherent advantages of both. HEPSs present increased efficiency and operating safety in comparison with conventional ICE-powered systems. Furthermore, they can supply the electrical devices with power. This area of study is multidisciplinary in nature and, therefore, poses research challenges on ICEs, EMs, electronic converters, propeller design, monitoring and control systems, management and supervision systems, energy efficiency and optimization, aerodynamics and aircraft mechanical design. A research project aimed at the characterisation of hybrid-electric aircraft propulsion systems, and the construction of a HEPS prototype, is underway in Brazil. The system is essentially composed of a GT, an EM, three electronic converters, a battery bank and a propeller. It can operate with three different topologies: series, full-electric and turbo-electric. A test bench with all the necessary peripheral and analysis infrastructure is under construction. Present work aims to: (i) develop simplified models for all the test bench components, (ii) given a mission profile, show the results of an initial energy management computing code that determines the optimal hybridization strategy, and (iii) simulate various operating alternatives for the chosen mission profile. The results (i) highlight the impact of critical characteristics of the batteries on the HEPS performance, and (ii) demonstrate the application of the management code on optimizing the aircraft energy consumption for a given mission profile.
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Song, Yachao, Danjiao Ma, Jingzhi Zhang, Jing-xiang Chen, Songze Chen, and Wei Li. "Numerical Analysis of Heat Transfer Characteristics for Supercritical Aviation Kerosene." In ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels collocated with the ASME 2015 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/icnmm2015-48264.

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With the physical property changing dramatically, the supercritical aviation kerosene obtains unique heat transfer characteristics. In this way, it is difficult to investigate the heat transfer characteristics by normal experiment and therefore we resort to numerical analysis to address the scientific questions in this study. The project is proposed to demystify the heat transfer characteristics of supercritical aviation kerosene with CFD in 4mm inside diameter vertical circular tubes. Under the conditions of different pressures (3.5MPa-5MPa), the physical properties of the fluid are expressed in linear poly-nominal fitting including density, isobaric specific heat, thermal conductivity and viscosity. With the guidance of CFD, we analyze how the heat transfer characteristics can be affected by the value of temperature, pressure, heat flux mass velocity and so on. The result indicates: (1) In primary heating process, convective heat transfer is enhanced significantly. (2) When wall temperature surpasses the critical temperature, heat transfer can be deteriorated. (3) When the temperature continues to go up, the convective heat transfer coefficient will rise greatly again. Furthermore, the project has also compared the numerical analysis result with experimental result, which shows good agreement with each other. Hence, the validation of numerical analysis of supercritical fluid is well recognized.
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Wang, Peng, Maria Vera-Morales, Patrick La, Mehrdad Zangeneh, Niklas Maroldt, Ole Willers, Felix Kauth, and Jörg Seume. "Design of a Mixed-Flow Transonic Compressor for Active High-Lift System Using a 3D Inverse Design Methodology." In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-15645.

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Abstract This paper presents the redesign of an electrically driven mixed flow transonic compressor by using a 3D inverse design methodology. The compressor will be used for an active high-lift system application that aims to delay the onset of stall and thus contributing to the reduction of both the aircraft noise footprint and the impact of aviation emission on local air quality. As part of a collaborative work between the Institute of Turbomachinery and Fluid Dynamics of the Leibniz University Hannover and Advanced Design Technology Ltd., an existing optimized compressor stage for this application is redesigned using a 3D inverse method. The new compressor design presents an increase in pressure ratio and total-to-total isentropic efficiency of more than 5.5% and 1% respectively at design point. The higher PR at design point allows the compressor to be run at lower rotational speeds, which decreases the load on the electric motor and the power electronic systems, and hence contributing further to the overall weight reduction of the entire system. The advantage of using an inverse design methodology is shown in this paper as a method that allows a very simple parameterization, reducing significantly the design time and hence allowing the exploration of wider design spaces, with the potential of reaching more innovative and efficient designs. The fast and reliable design and analysis of components represents an important advantage for the enhancement of aircraft electrification, where long design times are often a barrier for the exploration of system configurations.
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Khandekar, Sameer, Manfred Groll, Vivak Luckchoura, Walter Findl, and Jun Zhuang. "Micro Heat Pipes for Stacked 3D Microelectronic Modules." In ASME 2003 International Electronic Packaging Technical Conference and Exhibition. ASMEDC, 2003. http://dx.doi.org/10.1115/ipack2003-35109.

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In context of a European Commission funded project, development of a standardized multifunctional stacked 3D package was envisioned for potential applications in aviation, space and telecommunication sectors. The standardization and modularity was aimed to integrate packages from different technologies and to allow mutual slice inter-changeability. Thermal management solutions to the proposed new stacked 3D package as per the project specifications (a total of three stacked substrate slices, each slice of size 55 × 55 × 1 mm3 and total package height not exceeding 10.5 mm) are reported here. Three potential options were studied i.e. (a) module liquid cooling, (b) integration of miniature copper-water cylindrical heat pipes (OD 3.0 mm) with the 1.0 mm substrate slice and (c) development of flat plate heat pipes of 0.9 mm thickness. For options (a) and (b), initial tests have been performed taking aluminum as a representative material for AlSiC metal matrix composites which were to be employed in the final design. Further, copper based flat plate micro-structure conventional heat pipes have been developed and performance tested. Thermal interactions have been investigated with thermocouples coupled with infrared thermography. For safe operation up to 30W heating power (10W/slice), while thermal diffusion through the bare metallic substrate is sufficient for heat transfer from chip to the substrate, micro heat pipes should be employed to cool the substrate and transfer heat from it to an external cold plate. Flat plate heat pipes are advantageous for higher power levels per slice. Interlayer thermal interactions also affect the response of stacked 3D packages.
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Prabhakar, Varun J., and Peter Sandborn. "A Model for Making Part Sourcing Decisions for Long Life Cycle Products." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-47593.

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Long life cycle products, commonly found in aviation, medical and critical infrastructure applications, are often fielded and supported for long periods of time (20 years or more). The manufacture and support of long life cycle products rely on the availability of suitable parts, which over long periods of time, leaves the parts susceptible to a number of possible supply chain disruptions such as suppliers exiting the market, counterfeit part risks, and part obsolescence. One solution to mitigating the supply chain risk is the strategic formulation of suitable part sourcing strategies (optimally selecting one or more suppliers from which to purchase parts over the life of the part’s use within a product or within an organization). Strategic sourcing offers one way of avoiding the risk of part unavailability (and its associated penalties), but at the possible expense of qualification and support costs for multiple suppliers. Existing methods used to study part sourcing decisions are procurement-centric where cost tradeoffs focus on part pricing, negotiation practices and purchase volumes. These studies are commonplace in strategic parts management for short life cycle products; however, conventional procurement-centric approaches offer only a limited view when assessing parts used in long life cycle products. Procurement-driven decision-making provides little to no insight into the accumulation of life cycle cost (attributed to the adoption and use of the part), which can be significantly larger than procurement costs in long life cycle products. This paper presents a new life cycle modeling approach to quantify risk that enables cost effective part sourcing strategies. The method quantifies obsolescence risk as “annual expected total cost of ownership (TCO) per part site” modeled by estimating the likelihood of obsolescence and using that likelihood to determine the TCO allowing sourcing strategies to be compared on a life cycle cost basis. The method is demonstrated for electronic parts in an example case study of linear regulators and shows that when procurement and inventory costs are small contributions to the part’s TCO, the cost of qualifying and supporting a second source outweighs the benefits of extending the part’s effective procurement life.
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Pan, Liang-Ming, Xiangfei Liang, Ming-Dao Xin, Tien-Chien Jen, and Qinghua Chen. "Two-Phase Concurrent Separated Flow Model for Boiling Heat Transfer in Narrow Vertical Rectangular Space." In ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems. ASMEDC, 2005. http://dx.doi.org/10.1115/ht2005-72859.

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Compared with conventional channels, narrow and micro channels have significant characteristic of heat transfer enhancement. With smooth internal surface, such channels can efficiently avoid encrustation at the washing effect of the high-speed liquid. Moreover, heat transfer elements can be easily assembled. This type of channels have been adopted extensively in many engineering applications, e.g. microelectronic cooling, Advanced Nuclear Reactor, cryogenic, aviation and space technology and thermal engineering. In recent years, much work was focused upon flow patterns, heat transfer and pressure drop. Almost everyone thought the heat transfer enhancement mechanism of narrow and micro channels to be bubbles’ deformation and disturbance, which is insufficient to explain the heat transfer enhancement. In present work, an innovative model of quasi-one-dimensional vapor liquid two-phase concurrent separated flow was proposed for boiling heat transfer in vertical narrow rectangular space. Numerical results such as boiling heat transfer coefficient and liquid film thickness were obtained. Comparison of model results with reported experimental correlation indicates that the proposed model can predict heat transfer in narrow channels correctly, with the relative deviation less than 14%. Numerical simulating result confirms that heat conduction through liquid film is the predominant mechanism of boiling heat transfer in vapor liquid separated flow region in a vertical narrow rectangular space.
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Pan, Liang-Ming, Chuan He, Ming-Dao Xin, Tien-Chien Jen, and Qinghua Chen. "Heat Transfer and Bubble Movement of Double- and Single-Side Heating Subcooled Flow Boiling in Narrow Channels." In ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems. ASMEDC, 2005. http://dx.doi.org/10.1115/ht2005-72861.

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Compared with conventional channels, narrow and micro channels have significant heat transfer enhancement characteristic. With smooth internal surface, such channels can efficiently avoid encrustation at the washing of the high-speed liquid. Moreover, heat transfer elements can be easily assembled. These types of channels have been adopted extensively in many engineering applications, e.g. microelectronic cooling, advanced nuclear reactor, cryogenic, aviation and space technology and thermal engineering. Geometrical size of flow passage-away affects heat exchange of flow boiling, with the result that the bubble in narrow channel acts very different from those in non-narrow channel. This paper experimentally compared the bubble behavior with different heating methods of narrow rectangular channels, and the bubble behavior of subcooled flow boiling of R-12 in the narrow channels both with double side and single heating. Experimental settings are: the heating length of test-section is 400 mm, the cross-section is 35 mm in width and 2mm in gap size, mass flux is 700∼1500 kg.m−2.s−1, the heat flux is 25∼70kW.m−2 and the pressure is 1.3∼2.0 MPa. Comparisons were made on Onset of Nucleate Boiling (ONB) point and bubble characters with various flow patterns. Results revealed that the characteristics of double and single side heating shown good agreement with proper modifications.
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Pan, Liang-Ming, Chuan He, Ming-Dao Xin, Tien-Chien Jen, and Qinghua Chen. "Bubbles Coalescence and Condensation of Subcooled Flow Boiling in Vertical Narrow Channels." In ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems. ASMEDC, 2005. http://dx.doi.org/10.1115/ht2005-72860.

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Abstract:
Compared with conventional channels, narrow and micro channels have significant heat transfer enhancement characteristic. With smooth internal surface, such channels can efficiently avoid encrustation at the washing of the high-speed liquid. Moreover, heat transfer elements can be easily assembled. This type of channels have been adopted extensively in many engineering applications, e.g. microelectronic cooling, Advanced Nuclear Reactor, cryogenic, aviation and space technology and thermal engineering. In recent years, many efforts have been done which focused upon flow patterns, heat transfer and pressure drop. Almost every researcher thought the heat transfer enhancement mechanism of narrow and micro channels to be bubble’s deformation and disturbance, but the proposed mechanism is insufficient to explain the heat transfer enhancement of narrow channel. In present paper, an experimental flow visualization study has been performed under pressured conditions. Microscopic high-speed video visualization revealed that initial bubbles growth accompanied with slipping on heating wall in flow direction with slip velocity less than 0.1m/s. Several important parameters, such as heat flux and subcooling of cross-section, have important effects on the behavior of bubbles. At higher heat flux, it resulted shifting of the ONB point to the upstream and thus generated larger population of bubbles. It was observed that small bubbles (d = 0.01∼0.07mm) slipped on heating wall at a speed of 0.1 to 0.2m/s, and the velocity of larger bubbles (d = 0.1∼0.3mm) was increased to 0.25 ∼ 0.7 m/s. From flow visualization, it is showed that the process of large bubbles coalescing with small ones is the dominating mechanism of bubble growing. In some situation, the speed-increasing bubble’s size even formed vapor layer near the heating wall.
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