JPH10160621A - Wave making device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form the joint parts of wave making plates of smooth shape in a wave making device where a plurality of wave making machines are horizontally arranged in a testing water tank together. SOLUTION: A hollow round column 8 is fixed to the front end of a forward/ backward rod 6A of a wave making machine 10A, and the inner end parts of first and second plate bodies 9a and 9b which are larger in length than the radius of the column 8 are pivotally fixed by a bolt 12a on the axial center of the column 8. Then, wave making plates 11a and 11b pivoted by the outer ends of the bodies 9a and 9b of adjacent wave making machines are pivoted by the outer ends of the bodies 9a and 9b, and the hollow round column is interposed into the joint parts of the wave making plates, thereby form the joint parts thereof of smooth shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-directional wave generator for reproducing ocean waves in a test tank.

[0002]

2. Description of the Related Art Generally, for research on ships and marine structures,
A wave-making apparatus in which a plurality of wave-making machines are arranged in a lateral direction of a test water tank is used. As a conventional wavemaker, FIG.
(Side sectional view) is known. That is, in FIG. 9, reference numeral 1 denotes a motor as a drive source, and the rotation of the motor 1 converts the rotation of the motor 1 into a linear motion by a ball screw 2, a nut 3 screwed to a ball screw 2, and a nut 3. And is transmitted to the wave-making plate 7 via the support columns 4 guided by the linear way 5 and the rods 6 connected to the support columns 4.

In the wave maker 010, since the fulcrum of the rod 6 is located at the center of the wave maker 7, the wave maker 7 moves back and forth in a vertical state with respect to the linear movement of the rod 6, and Waves can be formed on the front surface. Then, as shown in FIG. 8, a plurality of wavemakers 010 having such a configuration are mounted side by side in the test water tank 20, and oblique waves can be generated by moving each wavemaker 7 back and forth. it can. In addition, an ocean wave having a multidirectional spectrum can be generated by driving each wave-making plate by a certain algorithm.

[0004]

By the way, in the above-described wavemaker, a step is generated between mutually adjacent wavemakers, and a diffracted wave w is generated there (see FIG. 10). However, there is a problem that the accuracy of the method is reduced. In order to improve this, a driving point is provided at the end of the wave plate, the variation in the distance between the wave plates due to the phase difference is compensated by a flexible plate, and the continuity between the wave plates is maintained, and There have been proposed wave-making devices having a structure for preventing water leakage from the sea (Japanese Patent Publication Nos. 6-17847 and 6-70598).

However, these wave-making devices have a problem in durability of the flexible plate, and also have a problem in that the cost is increased due to the complexity of the structure of the expansion and contraction portion. The present invention is intended to solve these problems. By providing a structure having continuity without providing an expansion / contraction mechanism between the wave-making plates, it has good durability, low cost, and diffraction. It is an object of the present invention to provide a wave making device capable of preventing generation of waves.

[0006]

According to the present invention, there is provided a wave-making apparatus comprising a plurality of wave-makers arranged side by side in a test water tank in a horizontal direction. , A rod that is driven forward and backward by the motor, and a cylinder connected to the rod, and a connecting jig for a wave-making plate is attached to each of the upper and lower ends of the cylinder. Is composed of two plates, a first plate and a second plate, and each of the plates is formed to have a size slightly longer than the radius of the column, and each of the plates is formed of them. The ends are pivotally supported on the bolts on the axis of the cylinder, respectively, and the ends of the wave-making plate are rotatably supported at the respective outer ends to solve the problem.

[0007] A second plate of the wave maker disposed on the right side of the wave maker at the outer end of the first plate has a wave maker plate whose outer end is pivotally supported. The left end is pivotally supported, and the outer end of the first plate of the wavemaker disposed on the left side of the wavemaker is pivoted to the outer end of the second plate. The right end of the corrugated plate is pivoted to solve the problem.

Further, a control system for driving each motor of each wave maker by an algorithm to generate an ocean wave having a multidirectional spectrum is provided as means for solving the problem.

In the wave-making apparatus of the present invention, the end (connecting portion) of the wave-making plate can freely rotate along the outer periphery of the cylinder, so that the phase difference between the wave-making plates arranged adjacent to each other can be obtained. The resulting shortage of distance can be compensated for by the radius of the cylinder.

Further, since the connecting portions between the wave-making plates are cylindrical, the connecting portions can be maintained in a smooth shape.

Furthermore, since the end of the wave-making plate rotates while sliding on the outer periphery of the cylinder, water leakage from the back surface of the wave-making plate can be prevented. For this reason, continuity at the connection between the wave-making plates can be maintained, and a highly accurate wave can be generated.

By driving the motor of each wave maker by an algorithm, an ocean wave having a multidirectional spectrum can be generated.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a wave-making apparatus according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of FIG. FIG. 4 is an enlarged view of a main part of FIG. 2, FIG. 4 is a front view of the same, and FIGS. The same reference numerals in FIGS. 1 to 7 as those in FIGS. 8 to 10 indicate substantially the same members.

As shown in FIG. 1, the wave-making apparatus of this embodiment also comprises a plurality of wave-making machines 10 mounted side by side in a test water tank 20. The wavemaker 10 also includes a motor 1 as a drive source, a ball screw 2 for converting the rotation of the motor 1 into a linear motion, and a nut 3 screwed to the ball screw 2.

The nut 3 is connected to a support 4, and the support 4 is connected to a guide linear way 5 and a rod 6. The rod 6 is connected to a lightweight hollow cylinder 8. At the upper and lower ends of the hollow cylinder 8, two plate members including a first plate member 9 a and a second plate member 9 b as a jig for connecting the wave plate 11 are attached.

That is, the bolt 12 on the axis of the hollow cylinder 8
When the respective inner ends of both plate members 9a and 9b are pivotally connected by a, and the respective wavemakers 10 are juxtaposed at the respective outer ends of both plate members 9a and 9b as shown in FIG. The ends of the wave-making plates 11a and 11b (supplied with supplementary symbols "a" and "b" for clarifying the related configuration) are pivotally connected by bolts 12b and 12c, respectively.

Here, each of the plates 9a and 9b is formed to have a dimension slightly longer than the radius of the hollow column 8. That is, as shown in FIG. 5, at the outer end of the second plate 9b on the hollow cylinder 8A connected to the rod 6A of the wavemaker 10A,
The right end of the wave plate 11b whose left end is pivotally supported by the first plate 9a on the hollow cylinder 8B connected to the rod 6B of the wave generator 10B on the left side of the wave maker 10A is pivotally supported. At the outer end of the first plate 9a on the column 8A, a wave maker 10 on the right side of the wave maker 10A is provided.
The left end of the wave-making plate 11a whose right end is pivotally supported by the second plate 9b on the hollow cylinder 8C connected to the rod 6C of C is pivotally supported.

In this way, the plurality of wavemakers 10 are
7, the wave-making plates 11a and 11b are pivotally supported at their ends by the plate members 9a and 9b of the wave-making machine 10 adjacent to each other. Thus, a wave making device is configured.

Here, the plates 9a and 9b are formed to have dimensions slightly longer than the radius of the hollow cylinder 8, and the inner ends are pivotally supported by bolts on the axis of the hollow cylinder and are formed at the outer ends. Corrugated sheet
Since the end of 11 is configured to be pivotally supported by bolts 12b or 12c, the wave-making plate 11 rotates while sliding the side end surface facing the outer periphery of the hollow cylinder 8 against the outer periphery of the hollow cylinder 8. become.

In the above configuration, when the motor 1 of each wave maker 10 is driven with a certain phase difference, the rod 6 of each wave maker moves forward and backward with the phase difference. As each rod 6 moves forward and backward, each wave-making plate 11a, 11b moves from a state parallel to the lateral wall of the test water tank 20 shown in FIG. 7 to a state shown in FIG.

At this time, each wave-making plate 11a, 11b is
a, 9b, the wave-making plates 11a, 11b are moved.
b, the end face facing the outer periphery of each hollow cylinder 8 is a hollow cylinder 8
Never leave the outer circumference of the That is, each wave plate 11a, 11
b indicates that the hollow cylinder 8 has an end face facing the outer periphery of the hollow cylinder 8.
It rotates while sliding on the outer circumference of. Therefore each wave maker 10
Are driven with a certain phase difference, and each wave-making plate 11a, 11
Even if there is a phase difference in the movement of b, the shortage of the distance caused by the phase difference between the wave-making plates is compensated for by the radius of the hollow cylinder. ) Does not generate any gaps, and continuity is always maintained, so that no water leaks from the back.

In this manner, a plurality of wave-making plates can be smoothly driven, as shown in FIG. 1, in combination with the connection between the wave-making plates being cylindrical, and the accuracy is high. Waves can be generated. Further, when each motor 1 of each wave maker 10 is driven by an algorithm by a control system (not shown), an ocean wave having a multidirectional spectrum is transmitted to the test tank 20.
Can be generated.

[0023]

As described above, according to the wave making device of the present invention, the following effects and advantages can be obtained. (1) Since the end (connecting portion) of the wave-making plate can freely rotate along the outer periphery of the cylinder, the shortage of the distance caused by the phase difference between the wave-making plates arranged adjacent to each other is reduced. It can be supplemented by the radius. (2) Since the connecting portions between the wave-making plates are cylindrical, the connecting portions can be kept in a smooth shape. (3) Since the end of the wave-making plate rotates while sliding on the outer periphery of the cylinder, water leakage from the back surface of the wave-making plate can be prevented. For this reason, continuity at the connection between the wave-making plates can be maintained, and a highly accurate wave can be generated. (4) By driving the motor of each wave maker by an algorithm, an ocean wave having a multidirectional spectrum can be generated.

[Brief description of the drawings]

FIG. 1 is a plan view of a wave making device as one embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG. 1;

FIG. 3 is an enlarged view of a main part of FIG. 2;

FIG. 4 is a front view of a main part of FIG. 2;

FIG. 5 is a plan view for explaining the operation.

FIG. 6 is a plan view for explaining the operation.

FIG. 7 is a plan view for explaining the operation.

FIG. 8 is a plan view of a conventional wave making device.

FIG. 9 is a sectional view taken along the line BB of FIG. 8;

FIG. 10 is a diagram showing a state of generation of the diffraction wave.

[Explanation of symbols]

 Reference Signs List 1 motor 2 ball screw 3 nut 4 support 5 linear way 6 rod 7 wave plate 8 hollow cylinder 9a first plate 9b second plate 10 wave generator 11a, 11b wave plate 12a, 12b, 12c bolt

Claims (3)

[Claims] 1. A wave-making apparatus comprising a plurality of wave-making machines arranged side by side in a test water tank, wherein each of the wave-making machines is driven forward and backward by a motor as a drive source and the motor. And a column connected to the rod, connecting jigs of the wave-making plate are respectively attached to the upper and lower ends of the column, and the connecting jigs are connected to the first plate and the second plate. Each of the plate bodies is formed to have a dimension slightly longer than the radius of the cylinder, and each of the plate bodies is formed at an inner end portion on the axis of the cylinder. A wave-making device, which is pivotally supported by bolts, and rotatably supports an end of the wave-making plate at each outer end. 2. A wave-making plate having an outer end pivotally supported by an outer end of the first plate body on a second plate body of the wavemaker disposed on the right side of the wavemaker. The left end is pivotally supported, and the outer end of the second plate is connected to the outer end of the first plate of the wavemaker disposed on the left side of the wavemaker. The wave making device according to claim 1, wherein the right end of the plate is pivotally supported. 3. The control system according to claim 1, further comprising a control system for driving each motor of each wave maker by an algorithm to generate an ocean wave having a multidirectional spectrum. Wave making equipment.