Academic literature on the topic 'WingZ (Computer file)'

(1) Background: The optic strut (OS) is a critical landmark for clinoid and paraclinoid surgical interventions. To our knowledge, the current literature only mentioned the OS as a possibility for a lesser sphenoidal wing (LSW) pneumatization path, without a proper study of the pneumatization patterns and prevalence within this structure. Thus, our aim was to fill in the missing information. (2) Methods: A retrospective study on 80 cone beam computed tomography (CBCT) files was conducted to assess the prevalence and the origins of pneumatization within the OS. (3) Results: The pneumatization patterns of the OS were: 56.25% from the sphenoid sinus, 1.25% from the posterior ethmoid air cells (PEAC), and 10% from Onodi cells (ONC). Simultaneous pneumatization of unique origin within the lesser sphenoidal wing (LSW) was found in 26.25% from the sphenoid sinus, 1.25% from PEAC, and 5% from ONC. Communication between both LSW roots through pneumatization was found in 6.25% of the files. (4) Conclusions: A careful radiological examination should precede clinical diagnosis and surgical interventions in the paraclinoid area to evaluate postoperative surgical risks and possible diffusion patterns for infection. Additionally, pneumatization within the OS alters its morphological features and thus, its utility as a landmark.

Film thickness is one of the important parameters in the plastic film production process.A dynamic film thickness control system ,gradually adjusting the opening degree of the wind ring, is utilized for real-time control film thickness, enabling the film thickness to meet the requirements.This paper proposes a dynamic film thickness control system based on automatic wind ring ,consisting of industrial control computer, capacitance detection module, wing ring device , motor drives and so on.Then it further states the method of controlling the opening degree of wind ring by a series of stepper motors. The method can make the film thickness uniformity better,combining the traditional film production line with an idea of controlling automatic wind ring .

There are various scanners available in dental practice with various accuracies. The aim of this study was to compare the 3D capturing accuracy of scans obtained from Trios 3 and Dental Wings scanner. A reference mandibular model was printed from FormLab with reference points in three axes (X, Y, and XY and Z). The printed model was scanned 5 times with 3 scans: normal scan by Trios 3 (Trios 3A), high-resolution scan by Trios 3 (Trios 3B), and normal scan by Dental Wings. After scan, the stereolithography (stl) files were generated. Then, the measurements were made from the computer software using Rhinoceros 3D (Rhino, Robert McNeel & Associates for Windows, Washington DC, USA). The measurements made with digital caliper were taken as control. Statistical analysis was done using one-way ANOVA with post hoc using Sheffe (P<0.01). Trios 3 presented higher accuracy than Dental Wings and high resolution showed better results. The Dental Wings showed less accuracy at the measurements >50 mm of length and >30 mm in width. There was no significant difference (P>0.05) of control with the Trios 3A and Trios 3B. Similarly, for the measurements in Z-axis, there was no significant difference of control with each scan (Trios 3A, Trios 3B, and Dental Wings). Accuracy of the scan is affected by the length of the scanning area and scanning pattern. It is less recommended to Dental Wings scan >3-unit prosthesis and that crosses the midline.

Purpose: To report the use of virtual surgical planning and a 3D printed drill guide for the biopsy of mandibular lesions. Case report: A 38-year-old woman presented with two bilateral lesions in the mandibular body, in close proximity to the inferior alveolar nerve and the molar roots. An incisional biopsy was planned with coDiagnostiX software using the cone beam computed tomography DICOM files and a cast model that had been digitalized using a bench scanner (7series, Dental Wings, Quebec, Canada). A tooth-supported drill guide was produced by 3D printing with digital light processing technology (Moonray S, Sprintray, CA, USA). The surgical procedure was performed under local anesthesia. No complications were observed intraoperatively or during postoperative recovery. Conclusion: The use of an intraoperative surgical 3D-printed drill guide enables a smaller surgical procedure and more precise bone biopsies.

Terrestrial ecosystems can influence atmospheric processes by contributing a huge variety of biological aerosols (bioaerosols) to the environment. Several types of biological particles, such as pollen grains, fungal spores, and bacteria cells, trigger freezing processes in super-cooled cloud droplets, and as such can contribute to the hydrological cycle. Even though biogenic particles are known as the most active form of ice nucleation particles (INPs), the transport to high tropospheric altitudes, as well as the occurrence in clouds, remains understudied. Thus, transport processes from the land surface into the atmosphere need to be investigated to estimate weather phenomena and climate trends. To help fill this knowledge gap, we developed a drone-based aerosol particles sampling impinger/impactor (DAPSI) system for field studies to investigate sources and near surface transport of biological INPs. DAPSI was designed to attach to commercial rotary-wing drones to collect biological particles within about 100 m of the Earth’s surface. DAPSI provides information on particulate matter concentrations (PM10 & PM2.5), temperature, relative humidity, and air pressure at about 0.5 Hz, by controlling electrical sensors with an onboard computer (Raspberry Pi 3). Two remote-operated sampling systems (impinging and impacting) were integrated into DAPSI. Laboratory tests of the impinging system showed a 96% sampling efficiency for standardized aerosol particles (2 µm polystyrene latex spheres) and 84% for an aerosol containing biological INPs (Betula pendula). A series of sampling missions (12 flights) were performed using two Phantom 4 quadcopters with DAPSI onboard at a remote sampling site near Gosau, Austria. Fluorescence microscopy of impactor foils showed a significant number of auto-fluorescent particles < 0.5 µm at an excitation of 465–495 nm and an emission of 515–555 nm. A slight increase in ice nucleation activity (onset temperature between −27 °C and −31 °C) of sampled aerosol was measured by applying freezing experiments with a microscopic cooling technique. There are a number of unique opportunities for DAPSI to be used to study the transport of bioaerosols, particularly for investigations of biological INP emissions from natural sources such as birch or pine forests.

Drag reduction on airfoils using arrays of micro-actuators is one application of so-called Aero-MEMS. These microactuators interact with TS instabilities (Tollmien-Schlichting waves) inside a transitional boundary layer by superimposing artificially generated counterwaves in order to delay the transition process. These actuators need to exhibit a relatively large stroke at relatively high operational frequencies when operated at high Mach numbers. For this purpose, a novel micromachined mechanical amplification unit for increasing the stroke of piezoelectric microactuators up to high frequencies is proposed. The mechanical lever is provided by a sliced nickel titanium membrane. In this work, the actuator is explained in detail and wind tunnel experiments are carried out to investigate the effect of this mechanically amplified piezoelectric microactuator on thin transitional boundary layers. The experiments have been carried out in the transonic wind tunnel facility of the Berlin University of Technology on an unswept test wing with an NACA 0004 leading edge. The effectiveness of the actuator for flow control applications is determined in an open-loop setup consisting of one actuator having a relevant spanwise extension and a microstructured hot film sensor array located downstream. The aerodynamic results at Mach 0.33 are presented and discussed. It is shown that the actuator influences TS wave specific frequencies between 2.5 kHz and 7.4 kHz. The actuator amplitude is large enough to influence a transitional boundary layer significantly without bypassing the natural transition process which makes this type of micromachined actuator a candidate for high speed TS-control.

Computational Thinking (CT) is a set of logical-operational cognitive skills or processes of reasoning, based on Computer Science. Abstraction, pattern recognition, algorithmic reasoning, and decomposition are examples of some of these skills that form the four pillar of CT. Some researchers have considered these skills as useful, and even mandatory to to cognitive development of the schoolchildren. In this paper, we present practical aspects and the possible contributions of CT in the development of competence of reading and interpreting English texts. Didactic interventions were carried out in high school classes of a public school, supported by the Bring Your Own Device (BYOD) approach, in which the students used their own smartphones. During these interventions, the students developed concept maps and podcasts, performed online exercises and the traditional exam, all of that composed the set of evaluation instruments. It was possible to understand that the CT skills are intrinsically present and contributed to the development of the reading and writing skills in English. According to testimonials, we highlight that the BYOD approach provided new conceptions and perspectives on the use of electronic equipment in function of the students’ learning.ResumoO Raciocínio Computacional (RC) é um conjunto de habilidades ou processos cognitivos lógico-operacionais de raciocínio, fundamentadas na Ciência da Computação. Abstração, reconhecimento de padrões, raciocínio algorítmico e decomposição são exemplos de algumas dessas habilidades que formam os quatro pilares do RC. Alguns pesquisadores consideram essas habilidades úteis, e até mesmo fundamentais, para o desenvolvimento cognitivo dos estudantes. Nesse sentido, este relato de experiência tem por objetivo apresentar aspectos práticos e possíveis contribuições do RC no desenvolvimento da competência de leitura e interpretação de textos de diferentes naturezas na disciplina de língua inglesa. Para isso, realizaram-se intervenções didáticas em uma turma do ensino médio de uma escola pública, apoiadas na abordagem Bring Your Own Device ou, simplesmente, BYOD, em que os estudantes usaram seus próprios aparelhos celulares. Durante o desenvolvimento das intervenções, os estudantes construíram mapas conceituais e podcasts, realizarem exercício online e a tradicional prova, os quais compuseram o conjunto de instrumentos avaliativos do bimestre. Por meio dessas intervenções, foi possível identificar como as habilidades do RC estiveram intrinsecamente presentes e contribuíram para o desenvolvimento da competência de leitura e escrita em língua inglesa, elencada pelos Parâmetros Curriculares Nacionais. Conforme relatos, além da articulação didática com o RC, a abordagem BYOD proporcionou à professora e aos estudantes novas concepções e perspectivas sobre o uso de equipamentos eletrônicos em função da aprendizagem deles mesmos.Palavras-chave: Raciocínio computacional, Ensino de inglês, Mobile learning, Educação em computação.Keywords: Computational thinking, English teaching, Mobile learning, Computer science education.ReferencesALBERTA Education. School Technology Branch. Bring your own device: a guide for schools. 2012. Disponível em:http://education.alberta.ca/admin/technology/research.aspx. Acesso em: 01 fev. 2017.ALLAN, Walter; COULTER, Bob; DENNER, Jill; ERICKSON, Jeri; LEE, Irene; MALYN-SMITH, Joyce; MARTIN, Fred. Computational thinking for youth. White Paper for the ITEST Learning Resource Centre na EDC. Small Working Group on Computational Thinking (CT), 2010. Disponível em: http://stelar.edc.org/publications/computational-thinking-youth. Acesso em: dez 2017.ARAÚJO, Ana Liz; ANDRADE, Wilkerson; GERRERO, Dalton Serey. Pensamento Computacional sob a visão dos profissionais da computação: uma discussão sobre conceitos e habilidades. In: Anais dos Workshops do VI Congresso Brasileiro de Informática na Educação. v. 4, n 1, 2015. p. 1454-1563.ARMONI, Michal. Computing in schools: On teaching topics in computer science theory. ACM Inroads, v. 1, n. 1, p. 21-22. 2010. DOI=http://dx.doi.org/10.1145/1721933.1721941BARBOSA, Márcio Lobo; ALVES, Álvaro Santos; JESUS, José Carlos Oliveira; BURNHAM, Teresinha Fróes. Mapas conceituais na avaliação da aprendizagem significativa. In: Anais do XVI Simpósio Nacional de Ensino de Física, v. 14, 2005, p. 1-4.BELL, Tim; WITTEN, Ian; FELLOWS, Mike. Ensinando Ciência da Computação sem o uso do computador. Computer Science Unplugged, 2011.BOCCONI, Stefania; CHIOCCARIELLO, Augusto; DETTORI, Giuliana; FERRARI, Anusca; ENGELHARDT, Katja. Developing computational thinking in compulsory education Implications for policy and practice. European Commission, JRC Science for Policy Report. 2016.BRASIL, Ministério da Educação. Secretaria da Educação Básica. PCN+ ensino médio: Orientações educacionais complementares aos parâmetros curriculares nacionais, Brasília: MEC. 2002. Disponível em: http://portal.mec.gov.br/seb/arquivos/pdf/linguagens02.pdf. Acesso em: set 2017.BRASIL. Ministério da Educação (MEC). Base Nacional Comum Curricular. 2017. Disponível em: http://basenacionalcomum.mec.gov.br/. Acesso em: set 2017.BRITANNICA, Encyclopaedia. Phenol: Encyclopaedia Britannica Online Academic Edition. Encyclopædia Britannica Inc. 2012. Disponível em: https://www.britannica.com/. Acesso em: 01 fev. 2017.BROOKSHEAR, J-Glenn. Ciência da Computação: uma visão abrangente. Porto Alegre, Bookman Editora, 2005.CHARLTON, Patricia; LUCKIN, Rosemary. Computational thinking and computer science in schools. What The Research Says’ Briefing, v. 2. 2012. [s.p.]CHIOFI, Luiz Carlos; OLIVEIRA, Marta Regina Furlan de. O uso das tecnologias educacionais como ferramenta didática no processo de ensino e aprendizagem. In: Anais da III Jornada de Didática - Jornada de Didática: Desafios para a Docência e II Seminário de Pesquisa do CEMAD. Londrina, 2014. [s.p.]COMPUTER AT SCHOOL. Computational Thinking: a guide for teachers. Hodder Education - the educational division of Hachette UK Digital Schoolhouse, 2015. Disponível em: https://community.computingatschool.org.uk/resources/2324/single. Acesso em: 01 set 2017.CORREIA, Paulo Rogério Miranda; SILVA, Amanda Cristina; ROMANO JÚNIOR, Jerson Geraldo. Mapas conceituais como ferramenta de avaliação na sala de aula. Revista Brasileira de Ensino de Física, v. 32, n. 4, p. 4402-4408. 2010.COSTA, Giselda dos Santos. Mobile learning: explorando potencialidades com o uso do celular no ensino-aprendizagem de língua inglesa como língua estrangeira com alunos da escola pública. 2013. 201f. Tese (Doutorado em Letras). Faculdade de Letras. Universidade Federal de Pernambuco. Recife. 2013.CSIZMADIA, Andrew; SENTANCE, Sue. Teachers’ perspectives on successful strategies for teaching Computing in school. In: IFIP TCS. 2015. Disponível em: <http://community.computingatschool.org.uk/files/6769/original.pdf>. Acesso em março 2018.CSIZMADIA, Andrew; CURZON, Paul; DORLING, Mark; HUMPHREYS, Simon; NG, Thomas; SELBY, Cynthia; WOOLLARD, John. Computational thinking: A guide for teachers. Computing at Schools, 2015. Disponível em: https://community.computingatschool.org.uk/files/8550/original.pdf>. Acesso em: 26 out. 2017.DIAS, Reneildes; JUCÁ, Leina; FARIA, Raquel. High Up: ensino médio. Cotia, SP: Macmillan, 2013.GOOGLE FOR EDUCATION. What is Computational Thinking? Computational Thinking for Educators. 2015. Disponível em: <https://computationalthinkingcourse.withgoogle.com/unit?lesson=8&unit=1. Acesso em: set 2017.LEE, Irene; MARTIN, Fred; DENNER, Jill; COULTER, Bob; ALLAN, Walter; ERICKSON, Jeri; MALYN-SMITH, Joyce; WERNER, Linda. Computational thinking for youth in practice. ACM Inroads, v. 2, n. 1, 2011. p. 32-37.LIUKAS, Linda. Hello Ruby: adventures in coding. New York: Feiwel & Friends, 2015.LU, Zhao.; YING, Lu. Application of Podcast in Teaching and Learning Oral English for Non-English Majors. In: International Conference on Computational and Information Sciences, Shiyang, 2013. p. 1935-1938. doi: 10.1109/ICCIS.2013.506MANNILA, Linda; VALENTINA, Dagiene; DEMO, Barbara; GRGURINA, Natasa; MIROLO, Claudio; ROLANDSSON, Lennart; SETTLE, Amber. Computational thinking in K-9 education. In: Proceedings of the working group reports of the 2014 on innovation & technology in computer science education conference. ACM, 2014. p. 1-29.MOREIRA, Antonio Marco. 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Abstract Multi-objective topology optimisation problems are often tackled by compromising the cost functions according to the designer’s knowledge. Such an approach however has clear limitations and usually requires information which especially at the preliminary design stage could be unavailable. This paper proposes an alternative multi-objective approach for the generation of minimal Pareto sets in combination with density-based topology optimisation. Optimised solutions are generated integrating a recently revised method for a posteriori articulation of preferences with the Method of Moving Asymptotes. The methodology is first tested on an academic two-dimensional structure and eventually employed to optimise a full-scale aerospace structure with the support of the commercial software Altair OptiStructⓇ. For the academic benchmark, the optimised layouts with respect to static and dynamic objectives are visualised on the Pareto frontier and reported with the corresponding density distribution. Results show a progressive and consistent transition between the two extreme single-objective layouts and confirm that the minimum number of evaluations was required to fill the smart Pareto front. The multi-objective strategy is then coupled with Altair OptiStruct and used to optimise a full-scale wing box, with the clear purpose to fill a gap in multi-objective topology optimisation applied to the wing primary structure. The proposed methodology proved that it can generate efficiently non-dominated optimised configurations, at a computational cost that is mainly driven by the model complexity. This strategy is particularly indicated for the preliminary design phase, as it releases the designer from the burden to assign preferences. Furthermore, the ease of integration into a commercial design tool makes it available for industrial applications.

Abstract As vectors of malaria, dengue, zika, and yellow fever, mosquitoes are considered one of the more severe worldwide health hazards. Widespread surveillance of mosquitoes is essential for understanding their complex ecology and behaviour, and also for predicting and formulating effective control strategies against mosquito-borne diseases. One technique involves using bioacoustics to automatically identify different species from their wing-beat sounds during flight. In this dataset, we collect sounds of three species of mosquitoes: Aedes Aegypti, Culex Quinquefasciatus & Pipiens, and Culiseta. These species were collected and reproduced in the laboratory of the Natural History Museum of Funchal, in Portugal, by entomologists trained to recognize and classify mosquitoes. For collecting the samples, we used a microcontroller and a mobile phone. The dataset presents audio samples collected with different sampling rates, where 34 audio features characterize each sound file, making it is possible to observe how mosquito populations vary heterogeneously. This dataset provides the basis for feature extraction and classification of flapping-wing flight sounds that could be used to identify different species.

Political discourse on social media is seen by many as polarized, vitriolic and permeated by falsehoods and misinformation. Political operators have exploited all of these aspects of the discourse for strategic purposes, most famously during the Russian social media influence campaign during the 2016 presidential election in the United States and current, similar efforts targeting the U.S. elections in 2018 and 2020. The results of the social media study presented in this paper presents evidence that political influence through manipulation of social media discussions is no longer exclusive to political debate but can now also be found in pop culture. Specifically, this study examines a collection of tweets relating to a much-publicized fan dispute over the Star Wars franchise film Episode VII: The Last Jedi. This study finds evidence of deliberate, organized political influence measures disguised as fan arguments. The likely objective of these measures is increasing media coverage of the fandom conflict, thereby adding to and further propagating a narrative of widespread discord and dysfunction in American society. Persuading voters of this narrative remains a strategic goal for the U.S. alt-right movement, as well as the Russian Federation. The results of this study show that among those who address The Last Jedi director Rian Johnson directly on Twitter to express their dissatisfaction, more than half are bots, trolls/sock puppets or political activists using the debate to propagate political messages supporting extreme right-wing causes and the discrimination of gender, race or sexuality. A number of these users appear to be Russian trolls. The paper concludes that while it is only a minority of Twitter accounts that tweet negatively about The Last Jedi, organized attempts at politicizing the pop culture discourse on social media for strategic purposes are significant enough that users should be made aware of these measures, so they can act accordingly.

Things used to be so simple. In the old days, a thousand generations ago or so, human technology wasn’t much more complicated than the twigs stripped of leaves that some chimpanzees use to fish in anthills. A large bone for a club, a pointed stick for digging, a sharp rock to scrape animal skins—such were mankind’s only tools for most of its history. Even after the appearance of more sophisticated, multipiece devices—the bow and arrow, the potter’s wheel, the ox-drawn cart—nothing was difficult to understand or decipher. The logic of a tool was clear upon inspection, or perhaps after a little experimentation. No longer. No single person can comprehend the entire workings of, say, a Boeing 747. Not its pilot, not its maintenance chief, not any of the thousands of engineers who worked upon its design. The aircraft contains six million individual parts assembled into hundreds of components and systems, each with a role to play in getting the 165-ton behemoth from Singapore to San Francisco or Sidney to Saskatoon. There are structural components such as the wings and the six sections that are joined together to form the fuselage. There are the four 21,000-horsepower Pratt & Whitney engines. The landing gear. The radar and navigation systems. The instrumentation and controls. The maintenance computers. The fire-fighting system. The emergency oxygen in case the cabin loses pressure. Understanding how and why just one subassembly works demands years of study, and even so, the comprehension never seems as palpable, as tangible, as real as the feel for flight one gets by building a few hundred paper airplanes and launching them across the schoolyard. Such complexity makes modern technology fundamentally different from anything that has gone before. Large, complex systems such as commercial airliners and nuclear power plants require large, complex organizations for their design, construction, and operation. This opens up the technology to a variety of social and organizational influences, such as the business factors described in chapter 3. More importantly, complex systems are not completely predictable.

This investigation describes a method for both manufacturing a biomimetic insect-sized wing using the photolithography technique and experimentally analyzing its structural dynamic response. The wing geometry of a crane fly forewing is captured using a micro-computed tomography scanner for its replication. A photomask of the membrane and venation pattern is designed from a computer-aided design model developed from the reconstructed scanned model of the wing. The photolithography process is conducted using the negative photoresist SU-8 and the Kapton film to biomimic the veins and the membrane of the crane fly forewing, respectively. A digital image correlation (DIC) system is used in conjunction to a shaker vibrational setup to determine the natural frequencies of the artificial wing from the fast Fourier transform of the time-varying out-of-plane displacement data. Wind-tunnel experiments are conducted using the DIC system to determine the structural response of the artificial wing under different freestream velocities and angles of attack within the regime of insect flight. The vibration modes are dominated by a bending and torsional deformation response. The deformation along the span of the wing increases nonlinearly from the root to the tip of the wing with Reynolds number.

A high-order computational method for the highly unsteady, complex vortical flows over delta wings is presented. A sixth-order compact difference scheme with an eighth-order low pass filter is used to solve the Navier-Stokes equations. Two approaches to turbulence modeling are investigated. The first scheme is an implicit LES (ILES) method which exploits the high-order accuracy of the compact difference scheme and uses the discriminating higher-order filter to regularize the flow. The second approach is a new hybrid RANS/ILES method which employs a standard k–ε model in regions where the grid resolution is unable to capture the turbulent behavior, and transitions to the ILES method in the vortical flow region where large scale turbulent structures are resolved. Computational simulations have been performed for a 50° sweep delta wing at 15° angle of attack and a moderate Reynolds number, Re = 2 × 106. Solutions employing the two turbulence models are evaluated on a baseline grid. A fine mesh computation has been performed for the ILES approach to investigate the impact of mesh resolution on this scheme. Computed results are also compared with the limited experimental measurements available. Computations exploring the control of the vortical flows above a swept delta wing by use of a dialectric-barrier-discharge actuator are also presented. With the actuator located near the apex, significant movement of the vortex breakdown location and a dramatic transformation of the shear-layer sub-structures are demonstrated.

A mechanism is presented that can generate insect wing like motion. This motion includes both flapping out of the stroke plane in addition to twist of the wing. The mechanism has a single degree-of-freedom and employs a five bar mechanism in addition to an auxiliary four bar mechanism. The parameters in the mechanism were optimized to generate a prescribed motion of the wing taken from a hawk moth kinematic flight data. A scaled model of the mechanism was fabricated to verify practical feasibility of the design. In future we will miniaturize this mechanism on our flying bird prototypes.

Abstract In the modern days of air travel, more fuel-efficient aircraft is desired to meet the demanding requirements of the long-haul market. This paper explores the feasibility of using a tensegrity column topology as the means for the internal mechanism of a twisting wing, which can be potentially applied to more fuel-efficient aircraft. This new morphing wing design removes the need for separate control surfaces such as ailerons and allow the wing to have a continuous surface which in turn will reduce aerodynamic drag and improve the overall performance. Furthermore, the tensegrity-based design can potentially reduce the weight of the wing by replacing conventional metal-based support structures with a lightweight tensegrity design. A design-of-experiments (DOE) study on the influence of the topological parameters of the torsional tensegrity mechanism on the achievable twist angle, structural mass, and the stresses in the different wing components is performed. It is found that for a wing with a span and chord length of 2 m, the maximum achievable twist angle from root to tip per unit mass, without any component exceeding their maximum allowable stress value, is 0.0659°/kg. The tensegrity column mechanism for this design consists of four torsional cells (equivalent to five ribs) and ten sets of actuating wires along the circumference of the column sections.

Abstract In this effort, a new approach in aerodynamic modeling that accounts for unsteady wake effects as well as viscous friction drag, Leading edge suction effect and post stall behavior for rotary wings in forward flight is proposed. The adopted approach commingles the unsteadiness with the problem of helicopter rotor blade in forward flight. The results of the local normal force coefficients were compared with experimental results of the 7A rotor case study in high speed test point 312 at five non-dimensional radial positions. A CFD solver, HOST/elsA, results are compared with the obtained results at five radii locations. The results show a good agreement between the experimental results and the proposed model preserving the same pattern of variation along the azimuth angle with a slight discrepancy for amplitude and phase angle. Of particular interest, the presented model showed better agreement with the experimental for higher radii locations.

With the advent of electronically alterable memories in electronic gas turbine engine control systems, there is now the opportunity for updating software in the field. Field loading provides a means to economically correct problems or introduce enhancements to system operation through the electronic control. In this paper we describe the characteristics of high integrity reprogramming systems used to update engine controls in-the-field. Pratt & Whitney Aircraft supports two methods for in-service reprogramming of Electronic Engine Controls (EECs), These two methods are PC Laptop based loaders and ARINC loaders. This discussion will focus on the capabilities provided to support in-the-field reprogramming of engine controls. The flexibility, integrity, and the benefits of field reprogramming provided by these software loading systems will be explained. These reprogramming systems provide a PC based application and ARINC based systems for either on-wing reprogramming or on-board reprogramming directly from a flight deck device to the EEC. The PC Loader reprogramming utilities allow field personnel to reprogram engine control application software and/or constants and configuration information using a suitably equipped IBM PC or compatible computer. These utilities are intended to be operated per Service Bulletin authorization only. They require a PC compatible computer (presumably a laptop model) with 2 UART interface cards, an interfacing cable, and the new software to be loaded. The rigor and manner of the integrity checks to ensure proper loading of the control is essential to an acceptable loading system. There are two types of ARINC-based loaders: on-wing loaders and on-board loaders. Both types enable the operator to upload application, trim, and/or configuration software to the engine control. Additionally the ARINC 615 device allows operators to download fault and configuration data from the control. Each type of loader uses a specially formatted file to control the sequence of operations involved in a data loading session. The on-wing loader utilizes a specially designed portable data loader which connects directly to the EEC via dedicated cabling through the control’s ARINC connectors. This type of data loader contains software which communicates via an ARINC 615 protocol to a peer software entity running on the EEC. The on-board loader uses the aircraft’s central maintenance computer system to communicate with the EEC over the aircraft’s ARINC 629 data bus. It also operates using a peer-to-peer communication protocol with the EEC. The ARINC 629 loader requires no extra equipment or cabling, nor does it require the EEC to be accessible for attachment of cables.

Abstract Piezoelectric flow energy harvesting can be a potential way to yield endless electrical energy for small mechanical systems and wireless sensors. We propose a novel magnetically coupled bistable vibration energy harvester using wings for the applications in the water environment. The water flow energy can be harvested through the induced vibration of wings. The flextensional transducer can be packaged conveniently by using non-contact magnetic coupling mechanism. The magnetic force is amplified by the flextensional structure and transferred to the piezoelectric layer, thereby achieving higher power density and better reliability. A prototype was fabricated and tested in a water flume, which attended a maximum power of about 400 μW and the average power of 55 μW at the water flow velocity of 4 m/s. No significant variation occurred to the performance of the harvester after five days of continuous operation in the water, which indicates that the magnetically coupled vibration energy harvesting method has high reliability in the underwater environment.

The research reported in the present paper has been motivated mainly by the need of reconstructing the airplane impact damage of the WTC Towers. The initial phase of this catastrophic event was dominated by fracture, leading to breakup and fragmentation of the airplane and severance of a large number of external columns. However, the role of fracture has been de-emphasized in the recent attempt to reconstruct the 9/11 attack [1–3]. The objective of this paper is to raise the phenomenon of ductile fracture to the level of a main factor controlling the initial phase of the September 11th event. Our philosophy is similar to that employed by Lawver et al [4], but we are treating ductile fracture in a much more comprehensive way including the topics of material testing, calibration, validation and finite element implementation. A particular scenario considered is the impact of a corresponding section of the wing of the Boeing 767 into one external box column of a Twin Tower. Real dimensions are taken for the WTC column and the wing section is represented as a thin-walled box beam. Both members undergo extensive plastic deformation and fracture. In developing computer models, special attention was paid to the choice of the element type (shell vs. solid), contact algorithm, element removal (erosion) option, and above all the fracture criterion. Most calculations were done using LS-DYNA for several combinations of the equivalent strain to fracture of the aluminum alloy wing and the steel columns. In addition five ABAQUS runs were made with a newly developed criterion for ductile fracture with a cut-off value for negative triaxialities. Impact velocities considered ranged from 120 to 480 m/sec where 240 m/sec was the actual impact speed of the Boeing 767. It was found that the damage process is localized in the immediate velocity of the impact area. The fracture process initiates at the impacting flanges in the Mode III out-of-plane shear, continues down the webs as a combined shear/tension (tearing) and finally ends up as a tensile fracture of the rear flanges. While the airplane wing box was almost always completely cut, the WTC column was often partially penetrated for a wide range of the equivalent strain to fracture. It was also found that introducing a modified fracture locus changes the sequence of failure pattern as well as the mode of fracture.