EP0236653B1 - Wave generator - Google Patents

Wave generator Download PDF

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Publication number
EP0236653B1
EP0236653B1 EP86440104A EP86440104A EP0236653B1 EP 0236653 B1 EP0236653 B1 EP 0236653B1 EP 86440104 A EP86440104 A EP 86440104A EP 86440104 A EP86440104 A EP 86440104A EP 0236653 B1 EP0236653 B1 EP 0236653B1
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Prior art keywords
float
swell
rear wall
basin
created
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EP86440104A
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German (de)
French (fr)
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EP0236653A1 (en
Inventor
Pierre Guevel
Eric Les Terrasses D'antibes - Bt. P 5 Landel
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Principia Recherche Developpement
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Principia Recherche Developpement
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D35/00—Pumps producing waves in liquids, i.e. wave-producers
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H4/00—Swimming or splash baths or pools
    • E04H4/0006—Devices for producing waves in swimming pools
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B1/00—Equipment or apparatus for, or methods of, general hydraulic engineering, e.g. protection of constructions against ice-strains
    • E02B1/006—Arresting, diverting or chasing away fish in water-courses or water intake ducts, seas or lakes, e.g. fish barrages, deterrent devices ; Devices for cleaning fish barriers
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B1/00—Equipment or apparatus for, or methods of, general hydraulic engineering, e.g. protection of constructions against ice-strains
    • E02B1/02—Hydraulic models

Abstract

1. System for generating an artificial surge or swell in an ocean engineering experimental basin or dock, of the type having a beater constituted by a cylindrical float parallel to the rear wall of the basin, characterized in that the section of said float, i.e. the generatrix of said cylinder, has a substantially vertical rear side, i.e. substantially parallel to said rear wall, and a nose-shaped front side, and said float is associated with mechanical means imparting to it a horizontal alternating movement, the mean distance between the rear wall of the float and the rear wall of the basin being chosen in such a way that a resonance phenomen is created between the swell train produced by the oscillations of the water column between said walls and that created by the movement of the float, the superimposing of these two trains giving rise to a very high transfer function in a chosen swell period interval.

Description

La présente invention concerne un nouveau système générateur de houle, destiné notamment aux bassins d'expérimentation de génie océanique.The present invention relates to a new swell generator system, intended in particular for ocean engineering experimental basins.

On sait qu'actuellement il existe essentiellement deux types de générateurs de houle, que l'on peut identifier en fonction de la nature de l'élément "batteur" exerçant son action dynamique sur la masse d'eau dans laquelle la houle artificielle doit être créée.We know that currently there are essentially two types of wave generators, which can be identified according to the nature of the "beater" element exerting its dynamic action on the body of water in which the artificial swell must be created.

En premier lieu, on peut parler des batteurs du type "volet", pouvant se présenter comme un volet vertical animé d'un mouvement de translation alternatif, ou comme un volet incliné, animé d'un mouvement de basculement alternatif, ledit volet pouvant lui-même être articulé et/ou couplé à un dispositif de translation de son axe de basculement (volets à double effet).Firstly, we can speak of beaters of the "flap" type, which can be presented as a vertical flap driven by an alternative translational movement, or as an inclined flap, driven by an alternating tilting movement, said flap being able to -even be articulated and / or coupled to a device for translating its tilting axis (double-acting flaps).

Les études effectuées sur ces systèmes font ap- pararaître qu'ils n'assurent une fonction de transfert (rapport entre l'amplitude de la houle produite et l'amplitude de l'élongation angulaire du batteur) satisfaisante que pour des systèmes à double effet et pour des périodes de houle courtes. Au surplus, sur le plan technique, de tels systèmes sont peu attractifs en raison de l'importance des masses à mettre en mouvement, des difficultés de pilotage simultané de deux vérins (translation en basculement) et des complexités techniques résultant des moyens nécessaires pour assurer l'étanchéité entre les volets et les parois latérales du canal.Studies carried out on these systems show that they only provide a transfer function (ratio between the amplitude of the swell produced and the amplitude of the angular elongation of the beater) satisfactory only for double-effect systems and for short swell periods. In addition, from a technical point of view, such systems are unattractive because of the importance of the masses to be set in motion, the difficulties of simultaneously controlling two jacks (translation in tilting) and the technical complexities resulting from the means necessary to ensure the seal between the flaps and the side walls of the channel.

En second lieu, on connaît les batteurs du type "coin plongeur", constitué par un prisme à section triangulaire vers le bas, dont une grande face glisse d'un mouvement alternatif le long de la paroi verticale arrière du canal. La fonction de transfert de ces batteurs n'est pas plus très satisfaisante et au surplus ces batteurs ne sont pas adaptables au cas des bassins à houle de grande profondeur, à houle et courant.Secondly, there are known beaters of the "plunger wedge" type, constituted by a prism with a triangular section downwards, a large face of which slides in an alternating movement along the rear vertical wall of the channel. The transfer function of these beaters is no longer very satisfactory and, moreover, these beaters are not adaptable to the case of very deep swell, swell and current pools.

Une solution nouvelle et plus satisfaisante a été suggérée récemment par la Déposante. Elle consiste à utiliser comme "batteur" un flotteur cylindrique horizontal, actionné en basculement sinusoïdal selon l'un ou l'autre de ses trois degrés de liberté.A new and more satisfactory solution was recently suggested by the Applicant. It consists in using as a "beater" a horizontal cylindrical float, actuated in sinusoidal tilting according to one or the other of its three degrees of freedom.

Bien que ce système conduise à des fonctions de transfert plus satisfaisantes, il présent encore l'inconvénient d'être coûteux, en raison des moyens complexes (vérin et embiellage) utilisés pour actionner le batteur.Although this system leads to more satisfactory transfer functions, it still has the disadvantage of being expensive, due to the complex means (actuator and connecting rod assembly) used to actuate the mixer.

Or on a fait la constatation intéressante que le même flotteur, animé cette fois simplement d'un mouvement alternatif horizontal, donc beaucoup moins coûteux, et disposé à une distance appropriée du mur arrière du canal, créée des houle présentant des fonctions de transfert beaucoup plus satisfaisantes encore que tous les systèmes connus.However, we made the interesting observation that the same float, this time simply animated with a horizontal reciprocating movement, therefore much less costly, and placed at an appropriate distance from the rear wall of the canal, created swells with much more transfer functions. still satisfactory than all known systems.

Au surplus, il est avantageux, pour créer un phénomène de résonance, favorable à ces résultats, quel'arrière dudit flotteur soit vertical.Furthermore, it is advantageous, to create a resonance phenomenon, favorable to these results, for the rear of said float to be vertical.

L'invention vise donc un générateur de houle constitué par un flotteur cylindrique, monté transversalement dans un bassin, à faible distance de la paroi verticale arrière de ce bassin, la génératrice dudit cylindre présentant une partie arrière sensiblement verticale et une partie avant en forme de bec, ce cylindre étant associé à des moyens lui imprimant une translation horizontale alternative, la distance moyenne entre la paroi arrière dudit flotteur et la paroi arrière dudit bassin étant choisie de manière telle qu'il se crée un phénomène de résonance entre le train de houle provoqué par les oscillations de la colonne d'eau comprise entre lesdites parois et celui créé par le mouvement propre du flotteur, la superposition de ces deux trains donnant naissance à une fonction de transfert très élevée dans un intervalle choisi de période de la houle.The invention therefore relates to a wave generator constituted by a cylindrical float, mounted transversely in a basin, a short distance from the rear vertical wall of this basin, the generator of said cylinder having a substantially vertical rear part and a front part in the form of spout, this cylinder being associated with means imparting an alternative horizontal translation to it, the mean distance between the rear wall of said float and the rear wall of said basin being chosen so that a resonance phenomenon is created between the swell train caused by the oscillations of the water column between said walls and that created by the proper movement of the float, the superposition of these two trains giving rise to a very high transfer function in a selected interval of the swell period.

Grâce à cette disposition, les organes mécaniques sont simplifiés, puisque se ramenant à un vérin horizontal, et les efforts qu'ils doivent exercer sont très réduits.Thanks to this arrangement, the mechanical members are simplified, since they are reduced to a horizontal jack, and the forces which they have to exert are very reduced.

L'invention va être décrite plus en détail grâce et avec référence au dessin ci-joint sur lequel:

  • La figure 1 est une coupe transversale schématique d'un système selon l'invention, et
  • la figure 2 est un diagramme faisant apparaître les variations de la fonction de transfert obtenue avec le système selon l'invention, selon la période de la houle.
The invention will be described in more detail thanks to and with reference to the attached drawing in which:
  • FIG. 1 is a schematic cross section of a system according to the invention, and
  • FIG. 2 is a diagram showing the variations in the transfer function obtained with the system according to the invention, according to the swell period.

En se référant tout d'abord à la figure 1, on voit que, selon l'invention, un flotteur cylindrique 1 parallèle à la paroi arrière verticale 2 d'un bassin à houle, de manière en soi connue, est animé, au moyen d'un vérin 3 d'un mouvement dit de cavallement, c'est-à-dire de translation horizontale alternative.By first referring to FIG. 1, it can be seen that, according to the invention, a cylindrical float 1 parallel to the vertical rear wall 2 of a swell pool, in a manner known per se, is animated, by means of a jack 3 of a so-called cavalry movement, that is to say of alternative horizontal translation.

La section de ce cylindre, c'est-à-dire sa génératrice, a la forme générale représentée sur la figure, à savoir:

  • - sa face arrière 4 c'est-à-dire faisant face à la paroi 2, est sensiblement verticale comme cette paroi. On verra plus loin les effets de cette particularité, ainsi que ceux de la distance d entre les deux surfaces;
  • - sa partie avant 5 est en forme de bec, faisant avec la surface 5 un angle a, dont la valeur la plus élevée possible, pour obtenir de bonnes performances en ce qui concerne la génération de la houle, et une valeur faible, pour obtenir une bonne régularité de courant de circulation au voisinage dudit bec, dans le cas représenté, où un courant existe dans le canal, dans la direction F, le batteur 1 créant ainsi un convergent pour ce courant avec la dénivellation entre les fonds 6 et 6'.
The section of this cylinder, that is to say its generator, has the general shape shown in the figure, namely:
  • - Its rear face 4, that is to say facing the wall 2, is substantially vertical like this wall. We will see below the effects of this peculiarity, as well as those of the distance d between the two surfaces;
  • - its front part 5 is in the form of a beak, making an angle a with the surface 5, the highest possible value of which, to obtain good performance with regard to the generation of swells, and a low value, for obtaining good regularity of circulation current in the vicinity of said spout, in the case shown, where a current exists in the channel, in the direction F, the beater 1 thus creating a convergent for this current with the difference in level between the bottoms 6 and 6 ' .

L'expérience montre que, grâce à ce système, il est possible d'atteindre des fonctions de transfert très élevées, notamment pour les périodes de houle de l'ordre de 2 à 3 secondes. La figure 2 illustre l'influence, sur les valeurs de ces fonctions de transfert, de la distance de l'arrière du batteur au mur du bassin, c'est-à-dire les effets dus au phénomène de résonance résultant de la variation cyclique de cette distance.Experience shows that, thanks to this system, it is possible to achieve very high transfer functions, in particular for swell periods of the order of 2 to 3 seconds. FIG. 2 illustrates the influence, on the values of these transfer functions, of the distance from the rear of the mixer to the wall of the basin, that is to say the effects due to the phenomenon of resonance resulting from the cyclic variation of this distance.

Sur ce diagramme, les courbes à VI correspondent à différentes valeurs de moyenne temporelle de la distance d, pour un batteur conforme à celui de la figure 1, ayant une largeur L à la flottaison de 1,9 m, immergé de 1 m dans un bassin dont le fond 6 est à 7 m et le fond 6' est à 3 m, la distance D étant de 10 m:

Figure imgb0001
In this diagram, the curves at VI correspond to different values of time average of the distance d, for a drummer conforming to that of Figure 1, having a width L at the waterline of 1.9 m, immersed by 1 m in a basin whose bottom 6 is 7 m and bottom 6 'is 3 m, the distance D being 10 m :
Figure imgb0001

Ces courbes sont à rapprocher de la courbe A, illustrant les variations de la fonction de transfert obtenue avec un flotteur semblable, mais animé d'un mouvement oscillant autour d'un axe transversal X.These curves are to be compared to curve A, illustrating the variations in the transfer function obtained with a similar float, but driven by an oscillating movement around a transverse axis X.

Il peut ressortir que, les fonctions de transfert obtenues avec le système selon l'invention sont les plus favorables dans le domaine des périodes souhaitables pour les bassins considérés; cela montre au surplus que les performances hydrodynamiques de ce système sont tout à fait différentes de celles des systèmes antérieurs les plus comparables du point de vue géométrique.It can be seen that the transfer functions obtained with the system according to the invention are the most favorable in the field of desirable periods for the basins considered; this also shows that the hydrodynamic performance of this system is quite different from that of the most geographically comparable prior systems.

Il convient également de bien observer que, bien que ces résultats découlent d'un phénomène de résonance précité, lui-même créé par l'effet de piston joué par le flotteur sur la masse d'eau située entre sa face arrière et le mur du bassin, ce qui implique la verticalité de cette face arrière, il est possible, dans le cadre de l'invention, de réaliser un flotteur dont ladite face arrière soit légèrement inclinée vers l'avant par rapport à la verticale. On obtient alors comme résultat supplémentaire une limitation du clapot entre le mur et le flotteur, sans pour autant diminuer la fonction de transfert.It should also be observed that, although these results result from the aforementioned resonance phenomenon, itself created by the piston effect played by the float on the body of water located between its rear face and the wall of the pelvis, which implies the verticality of this rear face, it is possible, within the framework of the invention, to produce a float whose said rear face is slightly inclined towards the front relative to the vertical. As a further result, there is a limitation of the chop between the wall and the float, without reducing the transfer function.

Il résulte de ce qui précède que le nouveau système générateur de houle selon l'invention présente un ensemble de caractéristiques nouvelles et intéressantes:

  • - fonction de transfert élevée
  • - simplicité du système mécanique
  • - bonne compatibilité avec les impératifs liés à la génération du courant dans le bassin
  • - faibles efforts hydrodynamiques exercés par le flotteur sur le vérin, du fait d'une masse d'eau ajoutée négative au voisinage de la période de résonance (2 à 30), ce qui permet de limiter les efforts d'inertie que le vérin doit développer pour actionner le flotteur.
It follows from the above that the new wave generator system according to the invention has a set of new and interesting characteristics:
  • - high transfer function
  • - simplicity of the mechanical system
  • - good compatibility with the requirements linked to the generation of current in the basin
  • - low hydrodynamic forces exerted by the float on the cylinder, due to a negative mass of added water in the vicinity of the resonance period (2 to 30), which makes it possible to limit the inertial forces that the cylinder must develop to operate the float.

Claims (3)

1. System for generating an artificial surge or swell in an ocean engineering experimental basin or dock, of the type having a beater constituted by a cylindrical float parallel to the rear wall of the basin, characterized in that the section of said float, i.e. the generatrix of said cylinder, has a substantially vertical rear side, i.e. substantially parallel to said rear wall, and a nose-shaped front side, and said float is associated with mechanical means imparting to it a horizontal alternating movement, the mean distance between the rear wall of the float and the rear wall of the basin being chosen in such a way that a resonance phenomen is created between the swell train produced by the oscillations of the water column between said walls and that created by the movement of the float, the superimposing of these two trains giving rise to a very high transfer function in a chosen swell period interval.
2. System according to claim 1, characterized in that, with a view to limiting the choppiness between the walls and the float, the rear face of the float is slightly forwardly inclined with respect to the vertical.
3. System according to claims 1 and 2, characterized in that it is installed in a basin with swell and current.
EP86440104A 1985-12-11 1986-12-01 Wave generator Expired - Lifetime EP0236653B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86440104T ATE54354T1 (en) 1985-12-11 1986-12-01 WAVE GENERATOR.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8518454 1985-12-11
FR8518454A FR2602012B1 (en) 1985-12-11 1985-12-11 SWELL GENERATOR

Publications (2)

Publication Number Publication Date
EP0236653A1 EP0236653A1 (en) 1987-09-16
EP0236653B1 true EP0236653B1 (en) 1990-07-04

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EP86440104A Expired - Lifetime EP0236653B1 (en) 1985-12-11 1986-12-01 Wave generator

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EP (1) EP0236653B1 (en)
KR (1) KR870006319A (en)
AT (1) ATE54354T1 (en)
BR (1) BR8606163A (en)
CA (1) CA1278926C (en)
DE (1) DE3672483D1 (en)
ES (1) ES2017639B3 (en)
FR (1) FR2602012B1 (en)
IL (1) IL80882A (en)
IN (1) IN167898B (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1003170A3 (en) * 1990-03-15 1991-12-17 Wow Company DEVICE FOR CREATING A MOVEMENT ON THE SURFACE OF A LIQUID.
BE1011083A6 (en) 1997-04-03 1999-04-06 Inan Mehmet Zahit Wave generator for liquids.
KR100689750B1 (en) * 2005-11-21 2007-03-09 인하대학교 산학협력단 An circulating ocean water tank system for absorbing wave energy
CN103276688B (en) * 2013-05-23 2015-05-20 中国长江三峡集团公司 Experimental water channel device for simulating instantaneous and complete break of dam
KR101585648B1 (en) * 2015-02-23 2016-01-15 홍익대학교 산학협력단 Solitary wave generating wave channel
US9920544B1 (en) 2016-11-29 2018-03-20 Walter Judson Bennett Plunger wave generator apparatus for efficiently producing waves in a body of water
AU2017251684B2 (en) * 2017-02-09 2018-12-06 Smartpark Technologies LLC Surfing wave pool using ship waves
KR102065839B1 (en) 2018-03-06 2020-01-13 이재훈 Wave generating device
KR102378608B1 (en) * 2020-01-07 2022-03-24 김기태 A wave generating system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE158102C (en) *
BR7202358A (en) * 1971-04-21 1976-05-04 Offshore Technology Corp PROCESS AND MECHANISM TO GENERATE PROPER WAVES FOR SURFING (WAVES PLANNING)
FR2291803A1 (en) * 1974-11-20 1976-06-18 Alsthom Cgee IMPROVEMENTS FOR SWELL GENERATORS OF THE DIVER TYPE

Also Published As

Publication number Publication date
ES2017639B3 (en) 1991-03-01
ATE54354T1 (en) 1990-07-15
FR2602012B1 (en) 1988-10-07
FR2602012A1 (en) 1988-01-29
IL80882A0 (en) 1987-03-31
CA1278926C (en) 1991-01-15
DE3672483D1 (en) 1990-08-09
BR8606163A (en) 1987-09-22
IL80882A (en) 1990-11-05
EP0236653A1 (en) 1987-09-16
KR870006319A (en) 1987-07-10
IN167898B (en) 1991-01-05

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