Wyniki wyszukiwania - Biblioteka Nauki

1

Analiz sposobov obeskrylivanija semjan khvojjnykh porod

100%

Luk'janenko V. , Galych I.

Motrol. Motoryzacja i Energetyka Rolnictwa

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2015

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tom 17

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nr 7

2

Paracladurinae - new subfamily [Diptera, Trichoceridae]

100%

Krzeminska E.

Acta Zoologica Cracoviensia

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1992-1993

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tom 35

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nr 1

3

Recykling śmigel elektrowni wiatrowych

86%

Foltynowicz Z.

Recykling

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2012

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tom nr 5

34--36

PL

W krajobrazie Polski pojawia się coraz więcej charakterystycznych wiatraków, które zamiast ziarna „mielą” wiatr i zamieniają go w ekologiczną energię elektryczną. W Polsce jest to nowość. W innych krajach (Dania, Niemcy, kraje skandynawskie) stare wiatraki wymieniane są na te nowszej generacji. Wówczas pojawia się problem, co zrobić np. ze starymi śmigłami? Jak je utylizować? Skierować na składowisko odpadów? Trzeba wtedy ponieść koszty składowania, a od niedawna nie pozwala na to dyrektywa odpadowa. Ponadto szkoda cennych tworzyw z których są wykonane. W związku z tym poszukuje się efektywnych i ekonomicznie uzasadnionych metod ich utylizacji.

4

Muscles of thoracic limb of African ostrich [Struthio camelus L.]

86%

Wustinger J. , Jasko D. , Drozdz D. , Basinska M. , Pospieszny N.

Electronic Journal of Polish Agricultural Universities. Series Veterinary Medicine

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2006

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tom 09

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nr 2

EN

The objective of the study was to analyze the wing musculature of the African ostrich. The investigation was conducted on four three-day old chicks of the ostrich. The muscles were characterized by poor development due to a very young age, and no flight abilities. The basic muscle units were described, the measurements of their length and width were taken and their mutual relation was calculated. All values were collected in a table. The photographic documentation was also prepared.

5

Numerical approach in aeroelasticity

86%

Sloboda O. , Korba P. , Hovanec M. , Pila J.

Zeszyty Naukowe. Transport / Politechnika Śląska

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2016

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tom z. 93

115--122

EN

Aircraft wing design processes should comprise specific analyses oriented towards aeroelasticity, which is one of the essential factors determining flight envelope boundaries. For such cases, static or dynamic aeroelastic phenomena can be simulated using CFD simulation software. ANSYS software offers the fluid structure interaction (FSI) method for solving this multiphysics problem.

6

Urządzenie zwiekszające zasięg klasycznych bomb lotniczych - modelowanie matematyczne i badania symulacyjne

86%

Sibilski K.

Zeszyty Naukowe Politechniki Świętokrzyskiej. Mechanika

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2004

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tom Z. 80

409-414

PL

W artykule podano model matematyczny uskrzydlonego zestawu zwiększającego donośność klasycznych bomb lotniczych. Przedstawiono także przykładowe wyniki badań symulacyjnych.

EN

This paper present the mathematical model describing flight dynamics of wing adapter kit for smart bomb range extension. The examplary results of numerical simulations are presented.

7

Wstępne badania aerodynamiki skrzydła typu delta w skali mikro z barierami mechanicznymi umieszczonymi przy krawędziach natarcia

86%

Kondratiuk M. , Kłoskowski P.

Acta Mechanica et Automatica

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2010

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tom Vol. 4, no. 3

60-69

PL

W niniejszym artykule przedstawiono ideę i wstępne obliczenia dotyczące małego samolotu bezzałogowego z zaimplementowanymi barierami mechanicznymi przy krawędziach natarcia. Pokrótce opisano prace prowadzone na całym świecie nad tego typu zagadnieniem. Na drodze obliczeń numerycznych wyznaczono rozkłady ciśnienia powietrza na powierzchniach nośnych płatowca typu delta. Wyznaczono wartości sił i współczynników aerodynamicznych. Porównano wyniki obliczeń przeprowadzone dla obiektu bez barier z wynikami uzyskanymi dla obiektu z zamontowanymi w barierami. Wyznaczone położenie i wymiary mechanicznych turbulizatorów powinny zapewnić możliwie największe zmiany wartości sił aerodynamicznych. Obliczenia przeprowadzono z myślą o wykorzystaniu barier mechanicznych do sterowania lotem mikrosamolotu.

EN

In this paper the idea of micro UAV and preliminary calculations with mechanical barriers implemented near edges of attack were presented. The world-wide investigations on such a problem were shortly described. Air pressure distribution on plane lift surfaces was obtained by means of numerical calculations. Aerodynamics forces and coefficients values were determined. Results of calculations conducted for delta wing without barriers were compared with those obtained for plane with mechanical edge turbulizers. The obtained position and dimensions of the barriers should ensure the best possible aerodynamic forces values modifications. The calculations were conducted with a view to taking advantage of edge mechanical barriers in order to control the MAV flights.

8

Review on delta wing against other wing designs for micro aerial vehicles

86%

Arun M. P. , Satheesh M.

Control and Cybernetics

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2020

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tom Vol. 49, No. 4

525--553

EN

Wings play a vital role in the design of micro aerial vehicles (MAV), in view of aerodynamic performance, maneuverability and hovering capabilities of the vehicles. The wings are generally classified as flapping, delta, swept, and so on. In this paper, the literature is reviewed regarding the diverse techniques utilized for the design, experimentation, analysis, simulation, and modeling of different types of wings. Among these types, this paper focuses on the design of delta wings. Accordingly, we review 60 relevant research papers and provide an analysis, based on their content. First, the paper presents the chronological review of the contributions relevant for the design of different types of wings. Subsequently, we focus on various materials such as stainless steel, aluminum, carbon fiber, etc., and on parameters such as Reynolds number, angle of attack, aspect ratio, etc., which are utilized for the design of wings. The paper also provides a detailed performance study regarding the contribution to the design of delta wing. Finally, we present various research issues, which can be useful for the researchers in accomplishing further research on the design of delta wings.

9

Observations and measurements of wing parameters of the selected beetle species and the design of a mechanism structure implementing a complex wing movement

86%

Geisler T.

International Journal of Applied Mechanics and Engineering

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2016

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tom Vol. 21, no. 4

837--847

EN

Beetle wings perform a flapping movement, consisting of the rotation relative to the two axes. This paper presents the results of observations and measurements of wings operating parameters in different planes of some beetle species. High speed photos and videos were used. The concept of the mechanism performing a complex wing movement was proposed and developed.

10

A study on performance of planing-wing hybrid craft

86%

Hamid Zeraatgar H. , Ali Bakhshandeh Rostami A. B. , Abolfazl Nazari A.

Polish Maritime Research

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2012

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tom nr 4

16-22

EN

A hybrid craft is defined as a combination of different lifting surfaces. The lift force can be of aerodynamic or hydrodynamic character. This research deals with the conditions of using planing mono-hulls equipped with a couple of wings, called planing-wing hybrid craft. A parametric study is conducted by using Vortex Lattice Method to determine feasibility of using an aerodynamic wing mounted to planing craft. It has been determined that the wing area should be more than twice as much as the wetted surface of the craft, to get an effective wing for planing craft. Furthermore, the wing should be so designed as to obtain its high aspect ratio. Maximum lift force contribution resulting from different wing configurations considered in this study is less than 35 percent of the total hydrodynamic lift force at an arbitrary condition. On this basis it may be concluded that the wing may be effectively used only in special conditions, hence this is not recommended for general application.

11

Analysis of the wing mechanism movement parameters of selected beetle species (Coleoptera)

86%

Geisler T. , Topczewska S.

International Journal of Applied Mechanics and Engineering

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2015

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tom Vol. 20, no. 1

53--64

EN

This study presents a structural and functional analysis of the wing bending and folding mechanism of a selected beetle species. Insect motility studies, with regard to the anatomical structure, were performed. The main inner wing structures were highlighted and their mechanical properties and functions were determined. The structure parameters as mechanisms bodies that allow wings of various beetle species to bend and fold were defined.

12

Morphometric study of wing venation in the recent Trichoceridae - an application to the fossils ?

86%

Krzeminska E.

Acta Zoologica Cracoviensia

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1992-1993

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tom 35

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nr 1

13

New information on Limoniidae from Monte Castellaro, Italy [Upper Miocene]

86%

Krzeminski W. , Gentilini G.

Acta Zoologica Cracoviensia

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1992-1993

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tom 35

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nr 1

14

The extent of the pterosaur flight membrane

72%

Elgin R. , Hone D. , Frey E.

Acta Palaeontologica Polonica

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2011

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tom 56

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nr 1

EN

The shape and extent of the membranous brachioptagium in pterosaurs remains a controversial topic for those attempting to determine the aerodynamic performance of the first vertebrate fliers. Various arguments in favour of the trailing edge terminating against either the torso or hip, the femur, the ankle, or different locations for various taxa, has resulted in several published reconstructions. Uncertainty over the correct model is detrimental to both aerodynamic and palaeoecological studies that are forced to simultaneously consider multiple and highly variable configurations for individual taxa. A review of relevant pterosaur specimens with preserved soft tissues or impressions of the wing membrane, however, strongly suggests that the trailing edge of the wing extended down to the lower leg or ankle in all specimens where the brachiopatagium is completely preserved. This configuration is seen across a phylogenetically broad range of pterosaurs and is thus likely to have been universally present throughout the Pterosauria. Support for opposing hypotheses where the trailing edge terminates against the body, hip, or knee are based on several specimens where the wing membrane is either incomplete or has undergone post−mortem contraction. An ankle attachment does not rule out a high aspect ratio wing as the curvature of the trailing edge and the ratio of the fore to hind limbs also play a major role in determining the final shape of the membrane.

15

Homology of submarginal crossveins in forewings of bees (Hymenoptera: Apiformes)

72%

Tofilski A.

Journal of Apicultural Science

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2011

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tom 55

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nr 2

16

Nerves of thoracic limb of the ostrich (Struthio camelus L.)

72%

Pospieszny N. , Pachulska P. , Pazdzior K. , Wustinger J.

Electronic Journal of Polish Agricultural Universities. Series Veterinary Medicine

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2009

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tom 12

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nr 4

17

Rudimentary finger claws in a flower-visiting phyllostomid bat

72%

Tschapka M.

Acta Chiropterologica

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2008

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tom 10

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nr 1

18

Badania eksperymentalne opływu wierzchołków płatów na tle obliczeń numerycznych

72%

Koronowicz T. , Tuszkowska T.

Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka

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2000

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tom nr 117, vol. 1

307-314

PL

W pracy zaprezentowano wyniki badań teoretycznych i eksperymentalnych związanych z opływem wierzchołków skrzydeł, począwszy od pierwszych modeli wirowych skrzydeł Żukowskiego, a kończąc na dwupowłokowym modelu powierzchni nośnej. Zaprezentowano tu najnowsze wyniki badań modelowych kawitacji wirowej na tle obliczeń numerycznych.

EN

Results of theoretical and experimental investigations of the flow around wing tips are reported. The analysis is starting with the earliest vortex model of Joukowsky wings, ending with double lifting surface model. The paper presents comparison of the latest model testing of vortex cavitation with numerical computations.

19

Functional and structural analysis of wing folding mechanism based on cockchafer (Melolontha Melolontha)

72%

Geisler T. , Rosikoń P. , Sochacki W. , Topczewska S.

Acta Mechanica et Automatica

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2014

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tom Vol. 8, no. 3

129--135

EN

Insects are among nature’s most nimble flyers. In this paper we present the functional and structural analysis of wing joint mechanism. Detailed action of the axillary plates and their mutual interaction was also described. Because of the small dimensionsn of the wing joint elements and the limited resolution of the light microscope, the authors used a scanning electron microscope. Based upon the knowledge of working principles of beetle flight apparatus a wing joint mechanism kinematics model has been developed.

20

Numerical analysis of modified FanWing concept

72%

Kurec K. , Piechna J.

Archive of Mechanical Engineering

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2009

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tom Vol. LVI, nr 4

325-347

EN

Modification of the FanWing concept intended for the use at higher speeds of flight (over 20 m/s) is numerically analyzed. The principle of operation, basic aerodynamic characteristics, and the features in untypical flight situation (autorotation) are described and explained.

PL

W pracy przedstawiono koncepcję modyfikacji skrzydła wentylatorowego przeznaczonego do lotów z większymi prędkościami (ponad 20 m/s) niż oryginalne skrzydło wentylatorowe. Wykorzystując program Fluent dokonano symulacji opływu skrzydła dla kilku konfiguracji geometrycznych, szeregu prędkości obrotowych wirnika i prędkości lotu. Przedstawiono i przeanalizowano podstawowe charakterystyki aerodynamiczne skrzydła. Wskazano zarówno na zalety rozwiązania jak i jego słabe strony. Analizy zachowania skrzydła zilustrowano szeregiem rozkładów ciśnień jak też wykresów nieustalonych sił aerodynamicznych. Zasugerowano dalsze kierunki badań.