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    Tytuł:
    Application of potential theory in calculating wave-induced vertical forces on horizontal cylinders near a plane boundary
    Autorzy:
    Marcinkowski, T.
    Wilde, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/241390.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    hydrodynamic forces
    underwater pipeline
    potential theory
    diffraction theory
    curvilinear coordinates
    Opis:
    Hydrodynamic forces acting on a horizontal cylinder located in the vicinity of the bottom are analyzed by a diffraction theory which solves the problem in terms of a velocity potential. The cylinder is assumed to be rigidly anchored to the bottom at a sufficient depth, so that it has no influence on the surface profile. The potential function φ is defined as the sum of the incident wave velocity potential φ w and the scattered wave velocity potential φa. The results of measurements of wave-induced pressures and forces on a horizontal cylinder located close to the bottom are compared with the theoretical solution based on the potential theory for incompressible, perfect fluid and ideal boundary conditions at the bottom and the surface of the cylinder. The experiments were carried out in the Large Wave Channel in Hannover with a cylinder of 0.8 m diameter. Thus the results are in a scale which corresponds to real pipelines. The analysis shows that the potential theory explains the components with double frequency of the wave in pressures and vertical forces as far as the amplitudes are concerned. In the experiments, the Keulegan-Carpenter number is rather low and the inertia hydrodynamic forces on the cylinder are dominant. It seems that the observed phase shift between the force component and the wave results from the energy dissipation which is not considered in the theoretical solution.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2006, 53, 1; 49-69
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Combining ability vs. population performance of genetic resources in rye
    Autorzy:
    Roux, S. R.
    Miedaner, T.
    Geiger, H. H.
    Knopf, E.
    Wilde, P.
    Wortmann, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2198911.pdf
    Data publikacji:
    2003-12-21
    Wydawca:
    Instytut Hodowli i Aklimatyzacji Roślin
    Tematy:
    combining ability
    genetic resources
    hybrid rye breeding programme
    Opis:
    The comparison of the population per se performance and the combining ability of 19 genetic resources and 5 adapted populations demonstrated that genetic resources might be integrated in hybrid rye breeding programmes without previous selection for yield. However, highly heritable traits like straw length and susceptibility to lodging should be improved before.
    Źródło:
    Plant Breeding and Seed Science; 2003, 48; 45-47
    1429-3862
    2083-599X
    Pojawia się w:
    Plant Breeding and Seed Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimation of general and specific combining ability variances and their implications on hybrid rye breeding.
    Autorzy:
    Wilde, P.
    Menzel, J.
    Schmiedchen, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2198901.pdf
    Data publikacji:
    2003-06-22
    Wydawca:
    Instytut Hodowli i Aklimatyzacji Roślin
    Tematy:
    CMS cross testers
    general combining ability (GCA)
    homozygous lines of rye
    hybridrye breeding
    specific combining ability (SCA)
    Opis:
    Effects and variances of general (GCA) and specific (SCA) combining ability have been estimated from two experiments. For the first experiment (EXP 1) 19 homozygous lines originating from the Petkus pool were crossed with two CMS single cross testers derived from the Petkus pool (intra-pool test crosses) and with two testers from the Carsten-Danko pool (inter-pool test crosses), respectively. In the year 2000 grain yield was measured at 5 locations in Germany. The second experiment (EXP II) comprised a factorial of inter-pool crosses by using 4 homozygous CMS Petkus pool lines as seed parents and 6 Carsten-Danko lines as pollen parents. The respective 24 inter-pool crosses were evaluated for grain yield on several locations in 1996 and 1998.In EXP I GCA-variance of candidate lines (4.7 —5.9 q/ha2 was estimated to have a similar size as SCA-variance. Possible reasons for an overestimation of SCA-variance are extreme divergence between testers, insufficient removal of inbreeding effects in the intra-pool test crosses and bias due to SCA × year interaction-variance. The use of intra-pool testers should be restricted to breeding material where inbreeding due to consanguinity between testers and candidate lines is either absent or will evenly affect test cross performance of all candidates.In EXP II GCA-variances for female 9.2 q/ha2 and male 2.4 q/ha2 lines were much higher than SCA-variance. Repeatability for GCA-effects over different environments was medium (r=0.67), whereas for SCA-effects it was low (r=0.13). Selection intensity for yield should therefore be moderate, if based on a single year of testing only. Selection of parental components for hybrids and prediction of hybrid performance should mainly base on GCA-effects. Alternative to the use of factorial crosses test crosses with testers representing the opposite pool are recommended. Testing for SCA-effects and for SCA x environment interaction- effects can be a valuable diagnostic tool, to become aware of strengths and weaknesses of the elite material used to build new hybrids. SCA-tests should therefore be performed by using highly divergent environments.
    Źródło:
    Plant Breeding and Seed Science; 2003, 47; 89-98
    1429-3862
    2083-599X
    Pojawia się w:
    Plant Breeding and Seed Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Laboratory investigations of deep-water wave transformation and stability
    Autorzy:
    Wilde, P.
    Sobierajski, E.
    Chybicki, W.
    Sobczak, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/240986.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    laboratory investigations
    deep-water wave transformation
    deep-water wave stability
    Opis:
    The authors performed laboratory investigations and the analysis of the transformation of deep-water waves in the flume of the Institute of Hydro-Engineering. Special wave trains were generated by our piston-type wavemaker. Due to the transformation the wave profiles changed along the path of propagation. At first, the changes appeared at the ends of the wave train. Far from the generator they intruded into the middle interval of initially regular waves. Finally, the whole wave train consisted of a set of irregular groups. To study the instability problem the wave trains were modulated by superposition of wave groups with very small amplitudes. The number of waves in a group was a very important parameter. When the number was proper, even small amplitudes of modulation resulted in strong development of amplitudes of wave groups. In our theoretical analysis the non-linear Schroedinger equation was used. The comparison of laboratory and theoretical results proved that this equation is useful but it does not describe the phenomenon in the best way. There have been many attempts to construct a numerical procedure that describes the propagation of water waves. Very often the numerical algorithm is not stable and the results of calculation diverge from the expected behaviour. The authors believe that in many cases the instability is due to the physical loss of stability of the wave train and thus it is necessary to have a good understanding of the physics of the studied motion.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2003, 50, 3; 287-313
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Long water waves as a structure fluid interaction problem
    Autorzy:
    Wilde, P.
    Chybicki, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/241470.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    long waves
    Lagrangian description
    Hamilton principle
    Opis:
    The paper describes a new formulation of the theory of long shallow water waves, which is based on the fundamental assumption that vertical material lines of fluid remain vertical during the entire motion. To make the problem consistent from the point of view of physics the case of waves in a flume due to the motion of a piston type generator is considered. At the piston the material line of water particles remains vertical during the entire motion and thus the generation follows the assumption in the description of the motion of water in the flume. Wave equations are derived with the help of a variational formulation of the problem in a material description. The Lagrangian is the difference between the kinetic and potential energies of the fluid and the mechanical system that describes a very simplified wave generator. The basic assumption simplifies the geometry of the displacement field. The definitions of generalized forces follow from variational calculus. The procedure ensures that the energy is preserved. A simple discrete formulation of the problem is based on the finite element method and the corresponding approximate expressions for energies.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2004, 51, 2; 95-118
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Non-linear water waves - experiments and theory
    Autorzy:
    Wilde, P.
    Sobierajski, E.
    Sobczak, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/241057.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    shallow water waves
    laboratory experiments
    Opis:
    The paper concems laboratory experiments on shallow water waves. The waves in our flume were generated as programmed groups, with gentle fading-in and fading-out of amplitudes of the wavemaker's piston's motions. The higher harmonic components have been considered in the motion. Their influence on characteristics of generated waves has also been studied. The measurements were carried out at 6 cross sections along the propagation path; both wave profiles and velocities were recorded. As a description of phenomena, the wave profiles were approximated by harmonic com-ponents according to the Stokes solution. It was noted, that parameters of harmonic components change along the propagation path; there are energy transfers between them. The higher harmonic components are more significant for the description of wave profiles, than for the velocities. The results of the experiments were used in verifications in a research program on the theoretical description and numerical al-gorithm for shallow water waves generated and propagated in a flume.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2001, 48, 2; 107-128
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the generation of water waves in a flume
    Autorzy:
    Wilde, P.
    Wilde, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/241118.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    water wave
    flume
    wavemaker
    horizontal motion
    piston
    Opis:
    The present paper proposes a simple model for the calculation of a time series to control the horizontal motion of the piston of a wavemaker. It is assumed that the initial conditions correspond to water at rest. It is assumed that parameters of kinematics of the fluid (displacement, velocity and acceleration fields) at the initial time are equal to zero. In the first interval the amplitudes grow to an asymptote that corresponds to a regular monochromatic wave. In the second interval the waves decay. Calculated time series were fed in to the control system of our wavemaker and the measured horizontal displacements of the piston compared. The control series was supplemented by terms corresponding to the Stokes type solution by addition of terms with multiples of the basic frequency.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2001, 48, 4; 69-83
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On variational formulation in water wave mechanics
    Autorzy:
    Wilde, P.
    Szmidt, J. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/241323.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    water wave
    variational formulation
    spatial and material description
    Opis:
    In this paper variational formulations for surface gravitational waves in inviscid incompressible fluids are investigated. The formulations are introduced with the help of the principle of virtual work. The starting point are equations of motion multiplied by a field of virtual displacements and integrated over the region occupied by the fluid. In derivations of the virtual work equation careful attention is paid to mutual relations between Eulerian and Lagrangian descriptions. The integration of the equation with respect to time leads to the expression for the Lagrangian function and then the Hamilton's principle. The case of a potential flow and spatial description provides a generalisation of the Lagrangian given by Luke (1967).
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2004, 51, 1; 55-74
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical analysis on experiments in transformation of deep-water-waves
    Autorzy:
    Wilde, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/241349.pdf
    Data publikacji:
    2005
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    water wave
    stability
    transformation
    wave groups
    non-linear Schrödinger differential equation
    Opis:
    The aim of the paper is to discuss the usefulness of the non-linear Schrödinger differential equation in the study of transformations of progressive deep water waves. Its solution compared with a regular Stokes type wave is essentially restricted to the first order approximation of the second one. The difference is that the Schrödinger equation introduces the concepts of a carrier wave and complex amplitude. In this way the dispersion relation of the third order Stokes expansion is taken into account. The analysis starts with regular, non breaking Stokes waves with large amplitudes as measured in our laboratory. The third order approximation is considered and compared with the corresponding solution of the Schrödinger equation. Then small periodic modifications are introduced in the time series fed into the control system of the generator. The approximation by trigonometric series is applied and the simplified analysis of superposition of very small modifications is used (higher powers of modifications are neglected). The Schrödinger non-linear equation is used in this analysis. The comparison of experimental and calculated envelopes is good, but for the surface elevations in space it is not as good. The approximation by trigonometric series is also applied to study the case of larger modifications. Finally the solutions of the Schrödinger equation corresponding to perfect solitons, are compared with the experimental data for cases where the measured surface elevations look almost like periodic solitons. This gives a reasonable approximation of the real behaviour in a very short space interval. It is not easy to get a good numerical description for the wave problem discussed as the waves are physically unstable. The results of the presented research will be used to establish an effective numerical procedure, stress the approximations introduced by the application of the Schrödinger differential equation and show how the theoretical solutions should be compared with the measured data.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2005, 52, 3; 213-242
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vibrations of a plate in fluid and associated damping due to energy transmission by dilatational waves
    Autorzy:
    Wilde, P.
    Szmidt, J. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/280228.pdf
    Data publikacji:
    1999
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    vibrations
    fluid
    damping
    silatational waves
    Opis:
    The paper presents a solution to the problem of harmonic vibrations of a plate submerged in an unbounded medium of inviscid compressible fluid. The solution is obtained, as a limiting case, by means of a solution to the problem of an infinite elliptic cylinder vibrating in the fluid. The latter problem is solved with the help of the Fourier method of separation of variables in the elliptic coordinate system. For comparison purposes, a similar problem of circular cylinder vibrating in the fluid is also investigated. From the discussion presented it follows, that the fluid compressibility is essential in estimating hydrodynamical forces, especially in calculating damping of plate vibrations for higher frequencies.
    W pracy przedstawiono rozwiązanie zagadnienia drgań harmonicznych płyty zanurzonej w nieograniczonym obszarze ściśliwej cieczy nielepkiej. Rozwiązanie to otrzymano za pomocą przejścia granicznego w zbudowanym rozwiązaniu dla nieskończonego walca eliptycznego drgającego w cieczy. Ten ostatni problem rozwiązano za pomocą metody Fouriera rozdzielenia zmiennych w eliptycznym układzie współrzędnych. Dla porównania, wyznaczono również rozwiązanie dla drgań walca kołowego zanurzonego w cieczy. Z przedstawionej dyskusji wynika, że ściśliwość cieczy jest podstawowym parametrem w opisie sił hydrodynamicznych, a szczególnie -- --tłumienia drgań płyty dla wyższych częstości.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 1999, 2; 267-282
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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