Relevant bibliographies by topics / Anhedral

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Anhedral'

Author: Grafiati
Published: 4 June 2021
Last updated: 2 February 2022

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Journal articles on the topic "Anhedral"

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Lee, T., V. Tremblay-Dionne, and LS Ko. "Ground effect on a slender reverse delta wing with anhedral." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 233, no. 4 (February 8, 2018): 1516–25. http://dx.doi.org/10.1177/0954410017754147.

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The ground effect on the lift and drag forces and vortices generated by a slender reverse delta wing with different anhedrals was investigated experimentally. The study was inspired by the Lippisch-type RFB X-114 WIG (wing-in-ground effect) craft for which a reverse delta wing planform with anhedral was employed. The results show that, by positioning the trailing edges of the anhedraled reverse delta wing parallel to the ground, the lift and drag coefficients were found to increase persistently with increasing anhedral as the ground was approached (for ground distances within 40% chord). The observed lift augmentation was also accompanied by an ever-increasing rotational speed and total circulation of the vortices generated by the anhedraled wing. The vortices were also found to be displaced more outboard as the ground was approached, which further suggests their little relevance to the lift generation of the anhedraled reverse delta wing.
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Lee, T., LS Ko, and V. Tremblay-Dionne. "Effect of anhedral on a reverse delta wing." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 232, no. 12 (July 11, 2017): 2317–25. http://dx.doi.org/10.1177/0954410017715047.

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The effect of anhedral on the vorticity flowfield and aerodynamic loadings of a slender reverse delta wing was studied experimentally. The addition of anhedral always led to a reduced lift and lift-to-drag ratio in comparison with their clean-wing counterparts. The drag was increased with increasing anhedral compared to the clean wing at the same lift condition. The reverse delta wing vortex retained its regularity to a higher angle of attack as the anhedral was increased. The persistent outboard location of the reverse delta wing vortex suggests that the lift force was mainly produced by the pressure exerted on the bottom surface of the wing. The anhedral also led to an increased vorticity level and tangential velocity.
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Lee, T., D. Huitema, and P. Leite. "Ground effect on a cropped slender reverse delta wing with anhedral and Gurney flaplike side-edge strips." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 233, no. 7 (June 8, 2018): 2433–44. http://dx.doi.org/10.1177/0954410018779504.

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The ground effect on the aerodynamic coefficients of a cropped slender reverse delta wing equipped with anhedral and Gurney flaplike side-edge strips was investigated experimentally at Re = 3.82 × 105. In a free stream, the 30% cropping was found to cause a minor reduction in lift CL and drag CD coefficients but a promoted stall compared to the noncropped wing. The anhedral caused further CL decrease and CD increase. Meanwhile, the application of side-edge strips produced a significantly increased CL and CD with a minor change to the CL/ CD ratio as compared to the baseline wing. In ground effect, the cropped wing was, however, found to generate more lift compared to the noncropped wing as the ground was approached. The joint anhedral and SES produced a great increment in both CL and CD but a virtually unchanged CL/ CD ratio compared to their outside ground effect counterparts. The larger the side-edge strips’ height the larger the increase in CL. In short, the cropping led to a weight reduction while the addition of anhedral and SES produced a large lift augmentation of the Lippisch-type wing-in-ground effect craft.
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Brugger, C. R., and J. E. Hammer. "Prevalence of growth twins among anhedral plagioclase microlites." American Mineralogist 100, no. 2-3 (February 1, 2015): 385–95. http://dx.doi.org/10.2138/am-2015-4809.

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Traub, L. W., R. Waghela, and K. A. Bordignon. "Characterisation of a highly staggered spanwise cambered biplane." Aeronautical Journal 119, no. 1212 (February 2015): 203–28. http://dx.doi.org/10.1017/s0001924000010344.

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AbstractAn investigation is presented to elucidate the performance of a staggered, spanwise cambered biplane. The spanwise camber yielded wings forming a ‘∧’ or ‘∨’ when viewed streamwise. The configuration is examined in terms of its aerodynamic and stability characteristics. The feasibility of negating the requirement for a conventional empennage is explored. Geometric variation encompassed front and back wing anhedral/dihedral angles yielding 49 combinations. Evaluation of the geometry was accomplished using both wind tunnel testing and numerical simulation. The results indicated that front wing dihedral in conjunction with aft wing anhedral was most beneficial, such that the benefit of wake spacing was maximised. Aerodynamic benefit was indicated compared to a conventional empennage geometry. The greatest disparity in behaviour of the fore and aft wing anhedral/dihedral distribution was in the high lift regime, where the nature of the stall varied. Simulations to establish the viability of the geometry in terms of controllability were also conducted and indicated that the configuration is viable.
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Kumar, M. Rohin, and C. Venkatesan. "Effects of rotor blade-tip geometry on helicopter trim and control response." Aeronautical Journal 121, no. 1239 (April 10, 2017): 637–59. http://dx.doi.org/10.1017/aer.2017.15.

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ABSTRACTFor performance improvement and noise reduction, swept and anhedral tips have been incorporated in advanced-geometry rotor blades. While there are aerodynamic benefits to these advanced tip geometries, they come at the cost of complicated structural design and weight penalties. The effect of these tip shapes on loads, vibration and aeroelastic response are also unclear. In this study, a comprehensive helicopter aeroelastic analysis which includes rotor-fuselage coupling shall be described and the analysis results for rotor blades with straight tip, tip sweep and tip anhedral shall be presented and compared. The helicopter modelled is a conventional one with a hingeless single main rotor and single tail rotor. The blade undergoes flap, lag, torsion and axial deformations. Tip sweep, pretwist, precone, predroop, torque offset and root offset are included in the model. Aerodynamic model includes Peters-He dynamic wake theory for inflow and the modified ONERA dynamic stall theory for airloads calculations. The complete 6-dof nonlinear equilibrium equations of the fuselage are solved for analysing any general flight condition. Response to pilot control inputs is determined by integrating the full set of nonlinear equations of motion with respect to time. The effects of tip sweep and tip anhedral on structural dynamics, trim characteristics and vehicle response to pilot inputs are presented. It is shown that for blades with tip sweep and tip anhedral/dihedral, the 1/rev harmonics of the root loads reduce while the 4/rev harmonics of the hub loads increase in magnitude. Tip dihedral is shown to induce a reversal of yaw rate for lateral and longitudinal cyclic input.
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Kim, Ki‐Chung, and Inderjit Chopra. "Aeroelastic Analysis of Swept, Anhedral, and Tapered Tip Rotor Blades." Journal of the American Helicopter Society 37, no. 1 (January 1, 1992): 15–30. http://dx.doi.org/10.4050/jahs.37.15.

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Barker, William W., and Vernon J. Hurst. "Freeze etch replication of extracellular bacterial polymers adsorbed onto kaolinite." Proceedings, annual meeting, Electron Microscopy Society of America 51 (August 1, 1993): 52–53. http://dx.doi.org/10.1017/s0424820100146102.

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Freeze etch replication of experimental mixtures of euhedral kaolinite and pure cultures of polysaccharide and protein-producing bacteria reveals that surface textures formed by adsorption of extracellular bacterial polymers onto kaolinite surfaces resemble structures observed in natural estuarine clay rich sediments, where anhedral 0.1 micrometer clay surfaces are covered by anhedral masses and fibrous elements of organic material.All samples, were cryofixed in a Balzers QFD101 propane jet and replicated in a Balzers 360M freeze etch device. Etching occurred at −100°C for 45 sec. and replicas were created with 15 nm Pt @ 45 °, 15 sec. C @ 90°. Following 24 h digestion in cone. HF, replicas were mounted on Formvar-coated 100 mesh Cu grids, carbon-coated for thermal stability, and examined in a Philips STEM 400.Anionic mucopolysaccharide produced by pure cultures of encapsulated Klebsiella pneumoniae (ATCC 8044) readily adsorbed to both the basal (negative charge) and edge (positive charge) surfaces of kaolinite (Fig. 1).
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Traub, Lance W. "Effects of Anhedral and Dihedral on a 75-deg Sweep Delta Wing." Journal of Aircraft 37, no. 2 (March 2000): 302–12. http://dx.doi.org/10.2514/2.2594.

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Barakos, G. N., and A. Jimenez Garcia. "CFD analysis of hover performance of rotors at full- and model-scale conditions." Aeronautical Journal 120, no. 1231 (June 13, 2016): 1386–424. http://dx.doi.org/10.1017/aer.2016.58.

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ABSTRACTAnalysis of the performance of a 1/4.71 model-scale and full-scale Sikorsky S-76 main rotor in hover is presented using the multi-block computational fluid dynamics (CFD) solver of Glasgow University. For the model-scale blade, three different tip shapes were compared for a range of collective pitch and tip Mach numbers. It was found that the anhedral tip provided the highest Figure of Merit. Rigid and elastic full-scale S-76 rotor blades were investigated using a loosely coupled CFD/Computational Structural Dynamics (CSD) method. Results showed that aeroelastic effects were more significant for high thrust cases. Finally, an acoustic study was performed in the tip-path-plane of both rotors, showing good agreement in the thickness and loading noise with the theory. For the anhedral tip of the model-scale blade, a reduction of 5% of the noise level was predicted. The overall good agreement with the theory and experimental data demonstrated the capability of the present CFD method to predict rotor flows accurately.
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Dissertations / Theses on the topic "Anhedral"

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Dawson, Ross Hughan. "Kite Turning." Thesis, University of Canterbury. Mechanical Engineering, 2011. http://hdl.handle.net/10092/5475.

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This thesis investigates the mechanisms behind the control of a typical two line kite, where the lines are attached to the kite side by side. This arrangement gives the kite flyer the ability to apply a roll angle to the kite, which then results in a yawing motion. The reason for this yaw rotation has not been adequately described previously. The definitions of roll and yaw for a kite have been re-defined to match the real world behaviour of the kite-bridle-line system. Specifically, these are defined as rotations relative to the lines rather than the kite itself. This detail has been neglected in previous research, and has a significant effect on the turning behaviour of a kite. A static model of a kite represented by flat disks was created. This model allows the out of balance forces and moments to be found for a kite when it is held at any position. When the kite is held with a roll angle applied, the disk angles of attack become unequal. This causes a change in the magnitude, direction, and point of action of the aerodynamic forces on each disk, which can lead to a yaw moment. While this does not give a complete picture of how a kite turns, it does explain one of the two mechanisms that cause a kite to begin to yaw when a roll angle is applied. The other mechanism is due to the velocity of the roll rotation, and is out of the scope of this thesis since a dynamic analysis would be required. The static model showed that any variation to kite geometry or any parameter that affects the equilibrium position of the kite will affect turning response. The most important of these parameters for a simple kite represented by two disks is the dihedral angle. A minimum negative dihedral angle (or anhedral) is required for a kite to turn in the expected direction when a roll angle is applied. The value of the minimum anhedral angle required for this behaviour varies with other parameters, but is generally between 8° and 20°. Other parameters such as bridle geometry also affect the turning response of a kite, primarily because they alter the equilibrium positions of the kite and line. Altering these equilibrium positions has a strong effect on turning response, since it changes the initial disk angles of attack. Additionally, if the kite and line are not aligned perpendicular to each other (which is a rare condition for a kite) a roll angle further changes the disk angles of attack, since the roll angle is applied about an axis relative to the line rather than the kite. An investigation into the effect of varying wind velocity on turning response showed that it has an important effect. Some kites will reverse their response to a given roll angle at some wind velocities, which could make the kite very difficult to control. Additionally, some kites can alter their equilibrium positions sharply with wind velocity, again causing varying turning behaviour as the wind conditions change. Future work should examine the dynamic turning response of kites. A dynamic simulation could be used to examine how the turning response of a kite is influenced by the rate at which a control input is applied. Additionally, the behaviour of the kite once the initial turning movement has begun could be assessed.
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Carr, Glenda Lytton. "Enwau pentrefi, prif anheddau a chaeau pum plwyf yn arfon : Llanbeblig, Llandwrog, Llanfaflan, Llanrug a Llanwnda." Thesis, Bangor University, 2007. https://research.bangor.ac.uk/portal/en/theses/enwau-pentrefi-prif-anheddau-a-chaeau-pum-plwyf-yn-arfon-llanbeblig-llandwrog-llanfaflan-llanrug-a-llanwnda(3256a9d7-c9f9-47ce-8399-332e715f148f).html.

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Astudiaeth sydd yma o enwau Ileoedd mewn pum plwyf yn Arfon, sef Llanbeblig, Llandwrog, Llanfaglan, Llanrug a Llanwnda. Rhestrir ac esbonir enwau'r plwyfi, y pentrefi a'r pentrefanau, y prif anheddau, y caeau ac unrhyw nodwedd ddaearyddol sydd yn elfen yn yr enwau hynny, megis enwau rhai afonydd, Ilynnoedd, mynyddoedd neu fryniau. Astudiaeth doponymig yw hon yn bennaf, ond ar yr un pryd ceisir cynnwys unrhyw ffeithiau o ddiddordeb Ilenyddol, chwedlonol, hanesyddol neu ddaearyddol sydd ynghlwm wrth yr enwau eu hunain, a'r anheddau a'r caeau a drafodir. Mae'n bwysig cofio nad enwau yn unig sydd Pr mannau a drafodir, ond Ilu o draddodiadau a chysylltiadau o bob math. Lie bo modd, ceisir hefyd gyfeirio at enghreifftlau eraill o'r enwau, o Gymru yn bennaf, ond cyfeirir at enghreifftiau cyfatebol yn Lloegr Ile bo hynny'n berthnasol. Yn y rhagymadrodd trafodir rhai o nodweddion ieithyddol yr enwau, yn enwedig y rhai tafodieithol. Ceir adran yn y rhagymadrodd hefyd ar dystiolaeth yr enwau, sef yr hyn a ddysgir ohonynt am natur y gymcleithas a'r ardal yn gyffredinol. Ar ddiwedd y traethawd ceir mynegai Hawn Wr holl elfennau a gynhwysir yn yr enwau Ileoedd sydd yn yr astudiaeth hon. Rhestfir yno bob enw Ile sydd yn cynnwys yr elfen clan sylw. Eglurir ystyr pob elfen yn ei thro yn Gymraeg ac yn Saesneg, a Ile bo hynny'n berthnasol, cynhwysir unrhyw gytrasau Wr ieithoedd Celtaidd eraill. Rhestfir hefyd bob enw personol sydd yn elfen yn yr enwau Ileoedd, a Ile bu'n bosib ceisiwyd o1rhain rhywfaint o hanes y teuluoedd a'r unigolion hyn.
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Carr, Glenda Lytton. "Enwau pentrefi, prif anheddau a chaeau pum plwyf yn arfon : Llanbeblig, Llandwrog, Llanfaglan, Llanrug a Llanwnda." Thesis, Bangor University, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488872.

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Books on the topic "Anhedral"

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Cymru, Tai. Development quality requirements for existing and rehabilitated dwellings =: Gofynion ansawdd datblygu ar gyfer anheddau sydd eisioes yn bod a rhai wedi eu hadfer. Caerdydd: Tai Cymru, 1998.

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Cadw : Welsh Historic Monuments., ed. Anheddau bychain gwledig yng Nghymru: Gofal a chadwraeth = Small rural dwellings in Wales : care and conservation. Caerdydd: CADW : Welsh Historic Monuments, 2003.

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Book chapters on the topic "Anhedral"

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Gooch, Jan W. "Anhedral." In Encyclopedic Dictionary of Polymers, 40. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_638.

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"anhedral." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 51. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_11982.

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"Anhedral." In Encyclopedic Dictionary of Polymers, 55. New York, NY: Springer New York, 2006. http://dx.doi.org/10.1007/978-0-387-30160-0_627.

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Conference papers on the topic "Anhedral"

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Zhou, Chong, Lakshmi N. Sankar, and Philip Griffin. "Effects of Anhedral on S-76 Hover Aerodynamics." In AIAA Scitech 2019 Forum. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2019. http://dx.doi.org/10.2514/6.2019-0289.

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Sankar, Lakshmi N. "Application of Hover Prediction Methodologies to Anhedral Tip Shapes." In 55th AIAA Aerospace Sciences Meeting. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2017. http://dx.doi.org/10.2514/6.2017-1870.

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Rasmussen, Maurice, and Maurice Rasmussen. "Effects of anhedral and finlets on lateral stability of hypersonic waveriders." In 35th Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1997. http://dx.doi.org/10.2514/6.1997-191.

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Jann, Thomas. "Aerodynamic Coefficients for a Parafoil Wing with Arc Anhedral - Theoretical and Experimental Results." In 17th AIAA Aerodynamic Decelerator Systems Technology Conference and Seminar. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2003. http://dx.doi.org/10.2514/6.2003-2106.

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Darling, Robert S. "Felsic Mineral Inclusions in Zircon from the Port Leyden Nelsonite, Western Adirondack Highlands, New York: A Product of Magma Mixing?" In Northeastern GSA Section Meeting. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016ne-272695.

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The Port Leyden nelsonite is small magnetite-apatite-ilmenite ore body occurring in Mesoproterozoic metapelitic gneiss on the western margin of the Adirondack Highlands. It is unusual in that no compositionally adequate parent magma (e.g. jotunite or oxide-apatite gabbronorite) has been identified in the area (Darling and Florence, 1995).The nelsonite typically contains elevated levels of Zr (1400 to 2500 ppm) largely present in abundant modal zircon. The Zr abundances are considerably higher than normal levels of Zr solubility in non-peralkaline melts and suggests that some of the zircon modal fraction is inherited (Hanchar and Harrison, 2003).The zircon grains display both euhedral, oscillatory zoned cores (interpreted as igneous) and anhedral, irregular, compositionally homogeneous rims (interpreted as metamorphic or igneous). The oscillatory zoned cores contain small (2-10 micrometer), solid inclusions that have energy-dispersive X-ray spectra (EDS) consistent with quartz, K-feldspar, plagioclase, biotite, and apatite. Remarkably, no low-silica mafic mineral inclusions (e.g. orthopyroxene, clinopyroxene, olivine) were observed in zircon.Felsic mineral inclusions in zircon from an igneous rock that has mafic magma affinities provides further evidence that the included cores of zircons in the Port Leyden nelsonite are inherited. This unusual occurrence may be possible considering that the mafic igneous rocks described above are part of the bimodal anorthosite-mangerite-charnockite-granite (AMCG) magmatic complex in the Adirondacks (McLelland et al, 1988). It is conceivable that during magma mixing, zircon from granite or charnockite may have become incorporated into coeval jotunite or oxide-apatite gabbronorite. Subsequently, the latter magma experienced either unmixing (Philpotts, 1967) or crystal settling (Dymek and Owens, 2001) to produce the Port Leyden nelsonite.
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