JPH0958579A - Oceanographic research ship - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high performance oceanographic research ship to prevent deterioration of performance of an acoustic apparatus even in a high speed area by a method wherein the acoustic apparatus is not covered with air bubble group. SOLUTION: In an oceanographic research ship 1 wherein an acoustic apparatus 3 to measure submarine topographies protruded from a ship bottom 2, the width of a neck-form connection part 4 between the acoustic apparatus 3 and the ship's bottom 2 is decreased to a value lower than the width wa of the acoustic apparatus 3.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a marine research vessel.

[0002]

2. Description of the Related Art Conventionally, as shown in a side view of FIG. 4 and a transverse sectional view of FIG. 5, a marine research vessel 1 has an acoustic equipment 3 projecting from a ship bottom 2 at the front thereof.

[0003]

While this type of research vessel is sailing, the acoustic equipment installed on the bottom of the ship surveys the seabed topography. However, when traveling at high speed, the bow wave becomes large. Air is entrained in the waves to form air bubbles, and a large amount of air bubbles travel along the side of the ship and flow into the bottom of the ship. At this time, when the group of bubbles flows around the acoustic equipment installed on the bottom of the ship, the propagation of sound waves is deteriorated, noise increases, and the accuracy of sound measurement is significantly reduced. As a result, improvement of work efficiency due to speeding up of research vessels is hindered.

The present invention has been proposed in view of the above circumstances, and provides a high-performance marine research vessel capable of preventing deterioration of the performance of an acoustic device even in a high speed range by preventing bubbles from covering the acoustic device. The purpose is to

[0005]

In order to achieve such an object, the present invention provides a marine research vessel in which an acoustic device for surveying the seabed topography is projected on the bottom of the ship, and The width of the connection portion with the ship bottom is smaller than the width of the audio equipment.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an overall side view thereof, and FIG.
II is a lateral cross-sectional view taken along the line II, and FIG. 3 is a bottom view taken along the line III-III in FIG.

In the above drawings, the same reference numerals as those in FIGS. 4 to 5 indicate the same members as those in the drawings, respectively. First, in FIGS. 1 and 2, with the ship bottom 2 of the audio equipment 3 installed on the ship bottom 2. The widths w ₁ and w ₂ of the neck-shaped connecting portion 4 are smaller than the width w _a of the audio device 3, as shown in the bottom view of FIG. 3III-III. That is, the broken line is an example of an elliptical neck-shaped adhesive portion that is substantially equal to the long axis of the horizontal cross section of the audio device 3, and the chain line indicates a slightly small neck-shaped adhesive part that is coaxial with the audio device 3 and has a slightly circular shape. It is one example shown. Due to such a structure, there is a slight vertical clearance δ between the neck-shaped adhesive portion 4 and the ship bottom.

In such a structure, the bubbles that have flowed into the bottom of the ship have the property of coming into close contact with the bottom 2 of the ship due to buoyancy and flowing to the stern side. Therefore, the bubbles flow through the clearance δ between the acoustic equipment 3 and the ship bottom 2 and do not cover the acoustic equipment.

[0009]

In such a structure, the bubbles flowing along the bottom of the ship pass through the gap δ between the acoustic equipment and the bottom of the ship, and do not cover the acoustic equipment. Therefore, it is possible to prevent the performance of the audio device from being deteriorated due to the bubbles.

In short, according to the present invention, in a marine research vessel in which an acoustic device for measuring the seabed topography is projected from the bottom of the ship, the width of the connection between the acoustic device and the bottom of the ship is determined by the width of the acoustic device. The present invention is extremely useful industrially, since a high-performance marine research vessel can be obtained in which bubbles are prevented from covering the acoustic device and the performance of the acoustic device is prevented from deteriorating even at high speeds by making the size smaller than that. .

[Brief description of drawings]

FIG. 1 is an overall side view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG.

FIG. 3 is a bottom view taken along the line III-III of FIG.

FIG. 4 is an overall side view showing a conventional ocean observation ship.

5 is a transverse cross-sectional view taken along the line VV of FIG.

[Explanation of symbols]

1 research vessels (marine research vessel hull) 2 boat bottom 3 an acoustic equipment 4 neck-like adhesive portion δ gap w _a sound equipment of the width w ₁ neck-like width of w ₂ neck-like adhesive portion of the adhesive portion

Claims (1)

[Claims] 1. In a marine research vessel in which an acoustic device for surveying the seabed topography is projected from the bottom of the ship, the width of the connection between the acoustic device and the bottom of the ship is made smaller than the width of the audio device. Marine research ship characterized by.