Дисертації з теми "Lightning strike to aircraft"
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Mouratidis, Theodore. "Aircraft charging using ion emission for lightning strike mitigation : an experimental study." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/122708.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 96-97).
Lighting strikes are a problem for aircraft flying in large external electric fields. In most cases, the strike is triggered by the aircraft; as it flies through an electric field, it becomes polarized, and on areas with small radius of curvature, the electric field is magnified. This can result in bidirectional leaders which extend from opposite polarity aircraft extremities. These can connect to oppositely charged regions in a cloud or the ground, resulting in a lightning strike. Current methods to avoid lightning are limited to avoiding thunderstorm regions, as recommended by weather radar or conversations between pilots and the ground. Methods to treat the symptom of a strike have been relatively successful; a mesh placed under the skin of the aircraft can distribute the current and heat of the localized strike. However, there are currently no active measures to prevent the strike from happening.
The Boeing Lightning Strike team at MIT has recently proposed an active system that exploits the physics of how a lightning arc is triggered from an aircraft in flight based on net charge control of the vehicle. The objective of this thesis is to prove the feasibility of controlling the net charge of an aircraft in flight by using ion emission from its surface. Different strategies to control the net charge of a flying isolated body were explored and analyzed. The first strategy tested was based on using charge emission from an electrospray source. A passive flow and forced flow configuration were tested, however it was shown that there were numerous difficulties associated with running the electrosprays in atmospheric pressure. To overcome the limitations of the electrospray source, a second strategy was tested based on a controlled corona discharge, which is known to have increasing current emission with increasing wind speed.
The first experiment was setup in the Wright Brothers Wind Tunnel; sharp tips were used to generate a corona discharge and a metallic sphere was used to simulate the aircraft. Significant electrical potential saturation was observed on the sphere, and it is likely this was due to the filamentary streamer corona regime which produces both positive and negative ions. Thus a new experiment was designed; a thin wire was used to generate a glow corona, which produces predominantly positive ions, and this was attached using GlO (a fiberglass composite material) to a metallically coated airfoil. Charging of much higher magnitudes was observed, indicating the glow corona regime is critically important in optimizing the potential of the airfoil. Charge control of an airfoil (Chord 0.2 m, Span 1 m) at 40 m/s was demonstrated to a level of -42 kV.
For an object of a given characteristic size, a certain amount of charge is required to satisfy the optimal charge condition, where negative and positive leader strikes are both equally likely or unlikely. The achieved potential of -42 kV is the order of magnitude required for this size airfoil based on the theoretical estimates, and these tests also showed a trend of linear potential variation with wind speed.
"Boeing Company for financially supporting my Research Assistantship"
by Theodore Mouratidis.
S.M.
S.M. Massachusetts Institute of Technology, Department of Aeronautics and Astronautics
Zhang, Bangwei. "Manufacturing, characterization, and modeling of graphene-based nanocomposites for aircraft structural and lightning strike applications." Diss., Wichita State University, 2012. http://hdl.handle.net/10057/5591.
Повний текст джерелаThesis (Ph.D.)--Wichita State University, College of Engineering, Dept. of Mechanical Engineering
Ashok, Kumar Sachin Sharma. "Incorporation of graphene thin films into the carbon fiber reinforced composite via 3d composite concept against the lightning strikes on composite aircraft." Thesis, Wichita State University, 2012. http://hdl.handle.net/10057/5592.
Повний текст джерелаThesis (M.S.)--Wichita State University, College of Engineering, Dept. of Mechanical Engineering
Wan, Ahmad Wan Fatinhamamah. "Modelling of lightning strike on an earth ground conductor." Thesis, University of Nottingham, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.438449.
Повний текст джерелаLee, Steve H. K. "Route optimization model for strike aircraft." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1995. http://handle.dtic.mil/100.2/ADA306230.
Повний текст джерелаMastrolembo, Giuseppe. "Understanding and optimising parameters for lightning strike testing of CFRP materials." Thesis, Cardiff University, 2017. http://orca.cf.ac.uk/113125/.
Повний текст джерелаEricsson, Max. "Simulating Bird Strike on Aircraft Composite Wing Leading Edge." Thesis, KTH, Hållfasthetslära (Inst.), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-103783.
Повний текст джерелаBigand, Audrey. "Damage assessment on aircraft composite structure due to lightning constraints." Thesis, Toulouse, ISAE, 2020. http://www.theses.fr/2020ESAE0027.
Повний текст джерелаAs composite materials are now widely used in the aeronautical industry, the sizing of these structures andtheir protection against lightning has become a major issue. It is important to develop predictive tools to obtaina structure concept that meets certification requirements with a controlled time and cost during the designphase. The interaction of lightning with a composite structure is a complex multi-physics phenomenon, with afurther difficulty due to the presence of a metallic protection on the surface and a layer of paint. In this context,this study aimed to develop an understanding of the forces generated by lightning and to assess itsconsequences in terms of damage to the composite. To this end, the phenomenon was first broken down tostudy its different components and define the impact of their interactions. In a first step, the free arc wascompared to the arc root in interaction with different substrates to define a vaporisation model of the lightningprotection. In a second step, the overpressure generated by the explosion of the surface protection duringvaporisation was evaluated to define spatio-temporal pressure profiles. In a third step, a mechanicalcharacterization of the paint was developed in order to quantify its confinement effect on the surface explosion.At each stage, a theory was developed and analysed via numerical models and tests. Finally, these threedifferent bricks are brought together in a mechanical model simulating the lightning impact on a compositestructure in order to predict the damage. In addition, a user subroutine has been developed to apply thiscomplex loading as well as a damage law. These models are compared with lightning laboratory test results todetermine their validity limits and their ability to predict the damage
Callahan, Jeremy. "Metrics of METOC forecast performance and operational impacts on carrier strike operations." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2006. http://library.nps.navy.mil/uhtbin/hyperion/06Sep%5FCallahan.pdf.
Повний текст джерелаThesis Advisor(s): Tom Murphree, Rebecca Stone. "September 2006." Includes bibliographical references (p. 61-62). Also available in print.
Tedrow, Christine Atkins. "Bird Strike Risk Assessment for United States Air Force Airfields and Aircraft." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/40926.
Повний текст джерелаMaster of Science
Evans, Simon. "Characterisation of outgassing from carbon fibre composite aircraft joints subjected to lightning current." Thesis, Cardiff University, 2018. http://orca.cf.ac.uk/117887/.
Повний текст джерелаBrown, Robert Jeffrey. "BIRD STRIKE HAZARDS AT AIRPORTS AND ASSESSMENT OF BIRD STRIKES AT A MIDWESTERN AIRPORT: 2000-2007." Miami University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=miami1229046725.
Повний текст джерелаWang, Yeqing. "Modeling of lightning-induced thermal ablation damage in anisotropic composite materials and its application to wind turbine blades." Diss., University of Iowa, 2016. https://ir.uiowa.edu/etd/2164.
Повний текст джерелаBakis, Gökhan [Verfasser], and Volker [Akademischer Betreuer] Altstädt. "Towards electrically conductive and interleaf-toughened carbon black-epoxy-carbon fiber laminates with enhanced lightning strike resistance / Gökhan Bakis ; Betreuer: Volker Altstädt." Bayreuth : Universität Bayreuth, 2020. http://d-nb.info/1214297528/34.
Повний текст джерелаMilluzzi, Anthony J. "An Avian Target Processing Algorithm to Mitigate Bird Strike Risk in Aviation." Ohio University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1556144831508548.
Повний текст джерелаHamilton, Marla Elizabeth. "Risk assessment of Bird Aircraft Strike Hazard for grassland birds at the McEntire Air National Guard Station, Eastover, South Carolina." Connect to this title online, 2009. http://etd.lib.clemson.edu/documents/1263409656/.
Повний текст джерелаMertz, Julien. "Development of protecting coatings for composites in an aero-engine." Thesis, Luleå tekniska universitet, Materialvetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-87245.
Повний текст джерелаLombetti, D. M. "Tufting of complex composite structures." Thesis, Cranfield University, 2015. http://dspace.lib.cranfield.ac.uk/handle/1826/11076.
Повний текст джерелаBedel, Vincent. "Mise en oeuvre et optimisation d'un revêtement conducteur poly(époxy) : fils submicroniques d'argent pour la protection foudre de structures aéronautiques." Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30144/document.
Повний текст джерелаThis work deals with the processing and the study of an extrinsic conductive polymer coating for the lightning strike protection of the aircraft carbon fibre reinforced polymer (CFRP) structural parts. The coating consist in a low viscosity bi component high performance poly(epoxy) matrix and silver submicronic wires with a high aspect ratio (AgNWs) obtained by a polyol process. The kinetic parameters, the physical structure and the molecular mobility of the matrix had been investigated as a function of the filler content. The surface and bulk conductivities had been measured as a function of filler content. It exhibits a percolation threshold below 1% in volume. The conduction mechanisms had been studied following an uncommon method of current density measurement as a function of the AgNWs content and the temperature. The critical electrical behaviour of each sample had been investigated through the current density method. It has permitted to understand the phenomenon responsible for the composite's degradation. Finally, lightning strike tests on representative configurations had been carried out. The ultrasonic inspections have highlighted the efficiency of the poly(epoxy)/AgNWs coating to avoid the structural delamination of the CFRP
Großmann, Katja [Verfasser], and Klaus [Akademischer Betreuer] Pfeilsticker. "Aircraft-borne DOAS limb observations of UV/visible absorbing trace gas species over Borneo: Implications for the photochemistry of iodine, volatile organic oxide degradation, and lightning-produced radicals / Katja Großmann ; Betreuer: Klaus Pfeilsticker." Heidelberg : Universitätsbibliothek Heidelberg, 2014. http://d-nb.info/1180301099/34.
Повний текст джерелаVogt, Juliane. "Modeling gap dynamics, succession, and disturbance regimes of mangrove forests." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-89901.
Повний текст джерелаDuhan, Daniel P. "Tactical decision aid for unmanned vehicles in maritime missions." Thesis, Monterey, California. Naval Postgraduate School, 2005. http://hdl.handle.net/10945/2274.
Повний текст джерелаAn increasing number of unmanned vehicles (UV) are being incorporated into maritime operations as organic elements of Expeditionary and Carrier Strike Groups for development of the recognized maritime picture. This thesis develops an analytically-based planning aid for allocating UVs to missions. Inputs include the inventory of UVs, sensors, their performance parameters, and operational scenarios. Operations are broken into mission critical functions: detection, identification, and collection. The model output assigns aggregated packages of UVs and sensors to one of the three functions within named areas of interest. A spreadsheet model uses conservative time-speed-distance calculations, and simplified mathematical models from search theory and queuing theory, to calculate measures of performance for possible assignments of UVs to missions. The spreadsheet model generates a matrix as input to a linear integer program assignment model which finds the best assignment of UVs to missions based on the user inputs and simplified models. The results provide the mission planner with quantitatively-based recommendations for unmanned vehicle mission tasking in challenging scenarios.
Lieutenant, United States Navy
Данильченко, Дмитро Олексійович. "Захист ліній електропередавання з захищеними проводами від прямих ударів блискавки". Thesis, НТУ "ХПІ", 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/36492.
Повний текст джерелаDissertation for the degree of candidate of technical sciences (doctor of philosophy) in specialty 05.14.02 - Electric power stations, networks and systems (141 – Power engineering, electrical engineering and electromechanics). – National Technical University "Kharkiv Polytechnic Institute", Kharkiv, 2018. The thesis is devoted to the solution of the current scientific and applied problem in the field of lightning protection of overhead transmission lines with protected wires of medium voltage classes from direct lightning strikes. In the work it has been experimentally proved that the protected wires are less likely to be struck by direct lightning strikes than bare wires. This is due to the protective envelope of the protected wires, since the conditions for the appearance of the oncoming streamer are significantly more complicated, then the lightning capture zone is significantly reduced. The current methods for calculating the number of direct lightning strikes do not take into account the type of wire on the overhead line, which leads to incorrect calculations of the number of direct lightning strikes, and, as a consequence, the number of line outages. The obtained results made it possible to create a new approach to lightning protection of overhead lines with protected wires, to create a combined power transmission line. This line contains in its design protected wires and bare wire, which acts as a lightning protection cable. The created model of the combined line was experimentally tested, not a single lightning strike into the protected wires was recorded.
Данильченко, Дмитро Олексійович. "Захист ліній електропередавання з захищеними проводами від прямих ударів блискавки". Thesis, НТУ "ХПІ", 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/36490.
Повний текст джерелаDissertation for the degree of candidate of technical sciences (doctor of philosophy) in specialty 05.14.02 - Electric power stations, networks and systems (141 – Power engineering, electrical engineering and electromechanics). – National Technical University "Kharkiv Polytechnic Institute", Kharkiv, 2018. The thesis is devoted to the solution of the current scientific and applied problem in the field of lightning protection of overhead transmission lines with protected wires of medium voltage classes from direct lightning strikes. In the work it has been experimentally proved that the protected wires are less likely to be struck by direct lightning strikes than bare wires. This is due to the protective envelope of the protected wires, since the conditions for the appearance of the oncoming streamer are significantly more complicated, then the lightning capture zone is significantly reduced. The current methods for calculating the number of direct lightning strikes do not take into account the type of wire on the overhead line, which leads to incorrect calculations of the number of direct lightning strikes, and, as a consequence, the number of line outages. The obtained results made it possible to create a new approach to lightning protection of overhead lines with protected wires, to create a combined power transmission line. This line contains in its design protected wires and bare wire, which acts as a lightning protection cable. The created model of the combined line was experimentally tested, not a single lightning strike into the protected wires was recorded.
Vandeveld, Thierry F. R. "Etude expérimentale multisensorielle de la dynamique des impacts d'oiseaux sur structures d'avions." Doctoral thesis, Universite Libre de Bruxelles, 2009. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210274.
Повний текст джерелаParmi les acteurs qui luttent contre ce danger, les constructeurs d'avions jouent un rôle prépondérant. Contraints par des réglementations internationales, ils s'attachent à produire des éléments de structure qui résistent à l'impact d'oiseaux.
Dans la mise au point de leur produits, les avionneurs démontrent cette résistance à l'aide d'essais d'impact :on accélère un simulant d'oiseau jusqu'à la vitesse voulue -- de l'ordre de la vitesse de croisière nominale de l'avion -- et on le projette sur un aileron ou un morceau de fuselage.
La présente thèse doctorale, co-dirigée par les professeurs Philippe Bouillard de l'ULB et Marc Pirlot de l'ERM, contribue doublement à l'amélioration de ces techniques d'essais dynamiques.
D'une part, elle réalise la mise au point et la validation d'un lanceur pyrotechnique à double étage pour l'accélération du simulant d'oiseau. Un canon de calibre 20 mm est combiné avec un accélérateur de calibre 160 mm. La combustion d'un mélange de poudre propulsive contenu dans une douille adaptée génère les gaz à haute température et à haute pression nécessaires à l'accélération d'un simulant d'oiseau dûment confiné dans un conteneur de protection. Un dispositif de séparation arrête le conteneur afin que seul le simulant d'oiseau percute l'élément d'avion à l'essai. La solution pyrotechnique à double étage mise au point est validée par de nombreux tirs instrumentés en vitesse, en accélération et en pression ;elle se révèle conforme aux exigences de sécurité et de reproductibilité. Le lanceur pyrotechnique présente par rapport aux solutions pneumatiques, utilisées à notre connaissance dans tous les autres centres d'essais, des avantages indéniables de compacité ainsi que de rapidité et de souplesse de mise en oeuvre.
D'autre part, la migration des alliages métalliques vers les matériaux composites est amorcée depuis plusieurs années déjà dans le monde de la construction aéronautique. Pour optimiser les structures, une connaissance des caractéristiques de ces matériaux est indispensable. Les modes de rupture font partie des caractéristiques encore mal connues. La mesure du déplacement hors-plan lors du tir sur panneaux plans est une des manières de quantifier le comportement du matériau sous l'action d'un impact. Cette mesure s'opère généralement de manière statique, après le tir. Une méthode de mesure dynamique a été mise au point, basée sur l'emploi de techniques de stéréoscopie par corrélation numérique d'images. Cette technique a été validée au moyen d'une méthode métrologique indépendante d'extensométrie laser.
ABSTRACT
Countless collisions occur each year between airplanes and birds. Bird strike is a concern to both civilian and militay aircraft. Statistics show that, although the number of serious accidents fortunately remains low, the number of incidents keeps increasing.
Amongst the actors tackling this issue, aircraft manufacturers play an important role. In compliance with international regulations, they have to produce structural elements that withstand bird impact. During the development of their products, aircraft manufacturers have to demonstrate this resistance through bird impact trials :a bird surrogate is accelerated to the required velocity - often close to the nominal cruise speed of the aircraft - and launched onto a flap or a piece of fuselage.
This PhD thesis has been co-supervised by Professor Philippe Bouillard (ULB) and Professor Marc Pirlot (ERM-KMS). Its contribution to the improvement of the aforementioned dynamic trials is twofold.
One one hand, a two-stage pyrotechnical launcher for bird surrogates has been developed and assessed. A 20 mm caliber gun is connected to a 160 mm diameter launcher. The combustion of a propellant mixture in a cartridge case generates high pressure, high temperature gases which accelerate a bird surrogate protected by a cylindrical container. A stripper refrains the container from hitting the target pane.
The pyrotechnical solution has been assessed through an important number of firings where pressure, velocity and acceleration have been measured. The solution has proven compliance with both the safety requirements and the repeatability specifications. Its advantages compared to the pneumatic solutions used, as far as we know, in all other test centres, include compactedness as well as flexibility and high firing rate.
On the other hand, migration towards composite materials has been initiated years ago in the area of aeronautical constructions.
To optimize structures, a thorough knowledge of these new materials is required. Failure modes belong to the still badly known features of carbon reinforced plastics. Measuring the out-of-plane deformation when firing on a flat pane is one way of quantifying the material's behaviour under impact. This measurement is most frequently made in a static way, after completion of the firing. A dynamic measuring method has been developed, based upon stereoscopic digital image correlation techniques. This technique has been validated by means of an independent laser extensometer measuring method.
Doctorat en Sciences de l'ingénieur
info:eu-repo/semantics/nonPublished
Wilson, David Joseph Humanities & Social Sciences Australian Defence Force Academy UNSW. "The eagle and the albatross : Australian aerial maritime operations 1921-1971." Awarded by:University of New South Wales - Australian Defence Force Academy. School of Humanities and Social Sciences, 2003. http://handle.unsw.edu.au/1959.4/38665.
Повний текст джерелаSearle, Deane. "Low Intensity Conflict: Contemporary Approaches and Strategic Thinking." The University of Waikato, 2007. http://hdl.handle.net/10289/2591.
Повний текст джерелаBerdahl, J. Scott. "Geological Effects on Lightning Strike Distributions." Thesis, 2016. http://hdl.handle.net/10754/610555.
Повний текст джерелаHanuta, Irene. "A lightning climatology for Manitoba using cloud-to-ground strike data from a lightning detection network." 1989. http://hdl.handle.net/1993/7183.
Повний текст джерелаBacci, Nicholas. "Traumatic effects of lightning strike on human bone morphology and ultrastructure." Thesis, 2016. http://hdl.handle.net/10539/21230.
Повний текст джерелаSouth Africa reports lightning fatality rates as high as 8.8 per million annually. Traditionally, forensic lightning fatality identification consists of soft tissue traumatic pattern recognition. This does not allow for manner of death identification in cases of full skeletonization. This study has expanded upon our earlier research, which identified characteristic patterns of lightning disruption in non-human bone. We thus explored the effects of induced lightning high voltage current on human cadaveric material in order to recognise electrically induced trauma. The objectives comprised analysis of microstructural damage through conventional thin-section histology, micro-focus computed tomography and histomorphometry. Experimentation was undertaken on bone blocks extracted from human lower limbs obtained from cadaveric specimens. An experimental system for simulated lightning induction to bone was developed and investigations were carried out on twenty-two bone block specimens. Micro-focus computed tomography was undertaken prior and after experimental treatment; while three blocks were used unmodified as control samples. Thin sections were obtained following post-trauma imaging. Measurements and photomicrographs of the alteration patterns were taken, while micro-focus computed tomography data were reconstructed and visualised as 2D orthoslices and 3D rendered volumes. Results indicated a poor efficiency of micro-focus computed tomography to resolve traumatic features in cortical bone. However, conventional histological methods demonstrated cortical bone trauma patterns well, allowing easy identification. Statistical analyses demonstrated relationships between current intensity and extent as well as typology of damage observed. The relationships identified suggested a dual mechanism of bone trauma, consisting of a combination of both electrically and thermally induced alterations. This study has thus allowed a primary overview and analysis of lightning trauma to human skeletal tissues.
MT2016
Huang, Chih-Min, and 黃志民. "An Analysis of Transient of Transmission Lines Caused by a Lightning Strike." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/33814087254190881017.
Повний текст джерела逢甲大學
電機工程所
94
The purpose of this study was to analyze the transient phenomena of transmission lines and towers with and without line arresters caused by lightning strokes, through which the specifications of structure design were modified in order to improve the reliability of power transmission. From this premise, by using ATP Draw model, three power configuration modes of the 345kv overhead transmission lines and towers were simulated and analyzed: (1) The four phases JMarti transmission line module (applied to overhead transmission lines with shields) joined the single phase distributive parameters Z module (used to simulate the field conditions of towers). (2) The single phase JMarti simulated for shield lines joined the single phase distributive parameters Z module for tower, and the three phases distributive parameters Z-T module for overhead transmission lines without shields. (3) The single phase distributive parameters Z module simulated for shield lines and towers joined the three phase distributive parameters Z-T modules for overhead transmission lines. In addition, the researcher sought to reply to other relevant modes set out in the literature to evaluate the present simulated conditions by way ofATP Draw. The results provided some evidence of the effectiveness of the aforementioned three modes.
Alonso, Daniel Filipe Moreira. "Numerical modelling of damage induced by lightning strike events in composite plates." Master's thesis, 2019. https://hdl.handle.net/10216/124304.
Повний текст джерелаZhang, Wei-Yu, and 張瑋育. "Simulation and Analysis of Lightning Strike Protection and Protection Margin for Secondary Substation." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/665z84.
Повний текст джерела國立高雄應用科技大學
電機工程系博碩士班
102
This study is developing lightning strike protection for S/S (Secondary Substation) and protection margin simulation analysis. To protect arresters on transmission lines or substation outdoor, Taipower applies ZnO Arresters widely used for its characteristics as non-linear, fast-response, great absorptive capacity, and non-continuity. In this ATP-EMTP to simulate whether S/S outside meets protection margin criteria of ANSI/IEEE under various lightning current and analyze the relationship between arresters location and protection margin. Based on the results, this study builds up lightning strike protection model for S/S and sets up transmission equipment parameters. Through this model, power designers will figure the characteristics of substation and plan the quantities and location of Arresters with fair cost while substation rebuilding.
ZHENG, JING-FU, and 鄭景富. "Analysis of Lightning Strike Accident Simulation and Prevention Strategy in Transmission Line Maintenance." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/8pafav.
Повний текст джерела國立虎尾科技大學
電機工程系碩士在職專班
107
This paper uses the TFlah software simulation analysis. When the overhead transmission line is subjected to different lightning currents, the insulation hinders the flashover and causes the line to jump and the voltage suddenly. The simulation is 161kV Jiamin E/S to Dougong P/S red line, #29 tower to #43 tower two return line overhead transmission line. It is necessary to first familiarize with the basic operation of the software, and set lightning protection measures according to local lightning density, frequency, and lightning classification to reduce lightning blackouts. General lightning strike accident improvement methods include reducing the grounding resistance of the tower tower foot, installing the line arrester, strengthening the insulation strength, adding the coupling ground line and increasing the width of the ground line to prevent lightning protection. The research results can be used as a reference for lightning protection design of overhead transmission lines. At the same time, the "Lightning Strike Information Platform" also revealed that the accident was caused by frequent lightning strikes, which ensured that the line was struck by lightning and the simulation results were mutually verified, thereby improving the overall power supply stability and quality of the transmission line.
Pan, Po-Hsun, and 潘柏勳. "Computation of Magnetic Intensity and Analysis of Lightning Strike in Taiwan High Speed Railway." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/01425089054151611637.
Повний текст джерела國立雲林科技大學
電機工程系碩士班
93
This thesis is divided into two parts. The first part calculates magnetic intensities of power-contact-wire exposure in Taiwan High Speed Railway (THSR). The new equation derived by Biot-Savart Law is used in this paper. It takes into account of conductor’s size, operating temperature, conductivity of contact wire as well as the skin effect. Thus, it can be accurate to estimate the distribution of magnetic intensities of the conductor. The second part is to simulate the lightning strike on the catenary in THSR. The structure of catenary and grounding systems can be constructed accurately by using CDEGS software packages. The efficiency of arrester location will be estimated when the lightning strike on the return feeder and the contact wire; furthermore, we discuss the phenomenon of back-flashover on the pole and the overhead grounding wire. Based on the simulation results, the improvement policy and method are concluded at the end.
WU, SZU-YI, and 吳思儀. "A Study of the Bird-Strike Prevention on Aircraft Type for Gangshan Airport." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/7ssv3t.
Повний текст джерела高苑科技大學
資訊科技應用研究所
106
A reference to the safety of the aircraft is the safety of people's lives and the cost of aircraft damage. In the event of flying accident not only caused huge damage to the property is more likely to directly endanger the safety of personnel on board. "Bird Strike" is the most difficult to avoid in flight and the most hard to expect the occurrence of flying security incident, so the prevention of bird strike is even more important. According to the study the occurrence and severity of the bird strike will vary depending on the type of aircraft. With the modern technological progress and people’s promotion of the safety protection and conservation awareness, it gradually developed a different ways on bird strike prevention.
Ngqungqa, Sphiwe Hamilton. "A critical evaluation and analysis of methods of determining the number of times that lightning will strike a structure." Thesis, 2006. http://hdl.handle.net/10539/1594.
Повний текст джерелаThe primary objective of this paper is to present results regarding data obtained from Eskom’s Lightning Positioning and Tracking System (LPATS) and is a continuation of the work presented at the two SAUPEC Conferences in Pretoria and Stellenbosch [1, 2]. LPATS provides some useful information regarding the lightning field measurements around the Brixton and Hillbrow Towers, in Johannesburg, for the two seasons of June 2001 to June 2003. The results suggest that there is a significant increase in apparent ground flash density in the vicinity of the towers when compared to the surrounding areas. The observation of mean current values in the order of -20kA suggests that the increased contribution of upward flashes to the total incidence of flashes in tall structures should lead to a decrease in measured current amplitudes.
Yang, Shuxin. "The effect of soil resistivity on the LV surge environment." Thesis, 2007. http://hdl.handle.net/10539/1993.
Повний текст джерелаDue to the high soil resistivities and high frequency of lightning strikes in South Africa, the background theory about the effect of soil resistivity on the LV surge environment is important, but the present local and international standards do not give reasonable explanations for this effect. The previously published experimental results and research results related to this effect were investigated. From these investigations, it can be shown that the soil resistivity can affect surge generation, surge propagation and surge attenuation significantly. Also, soil resistivity plays a main role in the lightning surges caused by both direct strikes and indirect strikes, which can cause severe damage to the LV distribution system. Soil resistivity also has a significant impact on the resistance of an earth electrode.
Milroy, Andrew G. "Impacts of Mowing on Bird Abundance, Distribution, and Hazards to Aircraft at Westover Air Reserve Base, Massachusetts." 2007. https://scholarworks.umass.edu/theses/22.
Повний текст джерелаGoldsmith, Sam. "China’s Anti-Access & Area-Denial operational concept and the dilemmas for Japan." Master's thesis, 2012. http://hdl.handle.net/1885/9721.
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