JP2846832B2 - Underwater obstacle detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underwater obstacle detecting apparatus for detecting underwater obstacles such as whales with good performance.

[0002]

2. Description of the Related Art In recent years, as shown in FIG.
An all-submersible hydrofoil S winging at a speed of 5 knots has appeared and is operating not only in Japan but also in foreign sea routes. 45
To fly at knot speeds, underwater obstacles (for example,
Even in the presence of whales or suspended objects, the ship may collide with the front strut 1 without delay in the evacuation operation. At that time, a large impact force is generated and the hydrofoil S stops in an emergency. There is.

Therefore, as disclosed in Japanese Patent Application Laid-Open No. 6-24387, a high-speed ship is used to quickly find (detect) whales and the like existing ahead in the traveling direction during wing running and to perform an escape maneuver. A collision prevention assistance device has been proposed.

In this conventional example, two sets of transducers are provided in a center pod provided at the lower end of a front strut of a hydrofoil, and different frequencies (20 kHz and 5 kHz) are provided from each transducer.
(0 kHz), oscillating ultrasonic waves to detect a cetacean or the like in front, and display means for displaying the distance and direction.

[0005]

However, in the above-mentioned conventional example, although the transducer is disposed in the center pod, it has been found that the detection performance is deteriorated by various noises.

In general, as the noise level (N) increases with respect to the reflected signal level (S) (that is, the S / N ratio decreases), the detection performance deteriorates and the detection distance decreases. . In other words, if the noise level is high, a detection distance sufficient to perform an evacuation operation cannot be secured.

[0007] By the way, noise can be caused by various causes, such as sea noise (a noise of a ship originally existing in the sea, noise of a biological sound, etc.), and flow noise (a noise generated on the surface of a center pod by the movement of a ship. Generated noise), cavitation noise (noise due to cavitation generated on the surface and edges of the structure as the ship sails), and solid-borne noise (vibration of the structure and vibration of the equipment as the ship sails) There are various types of noise: transmitted noise, running noise (noise caused by underwater sound when the ship is running, struting noise, etc.), and reverberation (reverberation inside the center pod).

Therefore, the applicant first investigated which noise deteriorates the detection performance, and as a result, especially in the case of a ship that sails at a high speed of 45 knots, the flow noise reduces the detection performance. It turned out to be dominant in the degradation. That is, it is understood that the flow noise caused by the turbulence of the water flow generated on the surface of the center pod submerged in the water as the ship sails greatly affects the detection performance by lowering the S / N ratio. Was. In addition,
Japanese Unexamined Patent Publication (Kokai) No. 1-233195 discloses an underwater sound insulating material in which a cavity is provided inside a rubber elastic body on the surface of a hull outer plate. It is not intended to reduce flow noise from the viewpoint of the mounting structure.

Therefore, in the invention according to this application, flow noise is mainly reduced to prevent the detection function of the detection device from deteriorating, and whales and the like existing in the water are found with a sufficient detection distance and evacuated. An object of the present invention is to provide an underwater obstacle detection device capable of reliably maneuvering a ship.

[0010]

In order to achieve the above object, the underwater obstacle detecting device according to claim 1 is provided with a center pod at a lower end portion of a strut of a hydrofoil ship.
Of the reinforced plastic whose acoustic impedance is relatively close to water
A detection sensor that forms a nose cone with a stick, oscillates ultrasonic waves inside the nose cone toward the sea in the forward direction of the hydrofoil ship, and receives ultrasonic waves from the front to detect an underwater obstacle. was HaiSo, in part or all aspects other than detection direction of the center pod <br/> of water and an acoustic impedance stuck a very different sound insulator, said Nozuko
Characterized in that the lining or coating of rubber material for flow noise reduction on the sides except for the front end of the whole or detection direction of the surface in contact with seawater over emissions.

A second aspect of the present invention is the underwater obstacle detection device according to the first aspect, wherein the rubber material for reducing flow noise is a rubber having a high noise attenuation effect such as chloroprene.

According to a third aspect of the present invention, there is provided the underwater obstacle detecting device according to the first or second aspect, wherein the hydrofoil ship has the center.
The nose has a hydrofoil that protrudes on both sides from the pod.
At the rear end of the cone, place a seal plate with rubber packing
It is characterized by being fixed .

According to a fourth aspect of the present invention, there is provided an underwater obstacle detecting apparatus according to the third aspect, wherein the seal plate itself is formed of a damping material .

[0014] underwater obstacle detection system of claim 5, claim
In the configuration of 3, the vibration damping material is attached to the front side of the seal plate.
And a sound insulation material is attached so as to cover the vibration damping material .

[0015]

According to the structure of the first aspect, the center of the hydrofoil ship is provided.
-Ultrasonic waves are oscillated from the detection sensor built in the pod toward the sea in the forward direction of the hydrofoil, and the reflected ultrasonic waves are reflected by hitting underwater obstacles such as whales existing in front. The underwater obstacle can be detected by receiving with the detection sensor. In this case,
The noise can be shielded, and the detection performance can be further improved.

Further, a center port incorporating the detection sensor is provided.
By lining or coating a rubber material reinforced plastic member seawater in contact with the surface of the head portion, attenuate flow noise has become a dominant obstacles to detection performance damping effect due to the viscoelastic properties of the rubber material Let
It can be significantly reduced.

The nose cone is composed of water and an acoustic impedance.
Is made of reinforced plastic that is relatively close
Then, the ultrasonic wave oscillated from the detection sensor makes the nose cone
Ultrasonic waves that pass through and are reflected from the front
The attenuation of the ultrasonic wave when passing through the nose cone is small
As a result, the detection performance is improved accordingly.

In addition, a separate nose is attached to the head of the center pod.
Nose cone itself because it is a configuration to form nose cone
Is easy to work, and also propagated from the center pod
Effective shielding of noise such as incoming solid-borne noise
You.

According to the second aspect of the present invention, when the chloroprene rubber is used as the rubber material for reducing the flow noise, it is easy to line the submerged body and has a high corrosion resistance, so that it can be used in seawater and can reduce the flow noise. It is suitable for obtaining an effect.

In the third aspect, the rear end of the nose cone is
The rubber packing itself sandwiched between the lubricating plates also acts as a vibration isolating rubber.
, The solid that propagates from the center pod
Blocking of noise such as propagation sound is effectively exhibited.

In the fourth and fifth aspects, the presence of a vibration damping material or the like allows
The noise reduction effect is further exhibited.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a submersible body (center pod) 2 at the lower end of a front strut 1 of a hydrofoil S which is a high-speed ship.
It is a figure which shows a mode that the ultrasonic wave reflected and hitting the underwater obstacle (whale) W which exists ahead is detecting an underwater obstacle.

This embodiment is an example of application to a hydrofoil S which wings at high speed as shown in FIG. 1, and is formed at the lower part of a front strut 1 and at the head of a center pod 2 as shown in FIG. Nose cone 3 (this is also called a submerged body part)
Usually, the detection sensor of the present invention is provided in the center pod 2 part). In FIG. 1, 1A is a rear strut, WL is a water line, and in FIG. 2, 4 is a hydrofoil that projects horizontally from the center pod 2 to both sides.

FIG. 3 is a horizontal sectional view of the nose cone according to the first embodiment, and FIG. 4 is a side sectional view thereof.

As shown in FIGS. 3 and 4, a detection sensor 5 which is a transmitter / receiver having both functions of a transmitter and a receiver is provided at a substantially central position in the streamlined nose cone 3. ing.
The box-shaped detection sensor 5 is attached to a flat plate-shaped bracket 6 protruding inside the nose cone 3 by bolts 7. The nose cone 3 itself has a transmission loss (a signal level lowering) when an ultrasonic wave oscillated from the detection sensor 5 passes through the nose cone 3 and a reflected ultrasonic wave reflected by an underwater obstacle passes through the nose cone 3. It is made of a material (for example, reinforced plastic) whose acoustic impedance is relatively close to that of water to minimize attenuation. This material also has rigidity that can withstand water pressure. A connection box 8 for introducing and connecting an electric wire protrudes rearward from the detection sensor 5. In addition, a boat speedometer 9 is provided at the bottom of the nose cone 3.

The outer surface of the nose cone 3 (the surface in contact with seawater) is lined or coated with a corrosion-resistant rubber material (for example, chloroprene rubber) 10. This is the case for ships that fly at speeds of up to 45 knots.
Since flow noise is generated, which is a major obstacle to detection performance, the flow noise is effectively attenuated, and the fluid excitation noise generated by the nose cone itself is reduced (that is, the S / N ratio is reduced). To increase the detection performance. Note that a medium such as water or castor oil is sealed inside the nose cone 3 due to the use of ultrasonic waves for detection.

On the inner surface of the nose cone 3 (the side surface where the detection sensor 5 is located), a sound insulating material 15 made of a sponge having a closed air bubble, for example, a material whose acoustic impedance is significantly different from that of water is adhered. The sound insulating material 15 is not provided in the range of the front surface (detection direction) of the detection sensor 5. This is because the noise in the direction other than the detection direction is shielded by the sound insulating material 15 as much as possible.

FIGS. 5 and 6 show a second embodiment in which a rubber material 1 is provided at the front end in the detection direction to prevent transmission loss of ultrasonic waves.
Reference numeral 0 denotes a case in which the rubber material 10 is provided only on the side surface excluding this portion without sticking. The other components are the same as those of the first embodiment, and therefore, the same components are denoted by the same reference numerals and description thereof will be omitted.

FIGS. 7 and 8 show a third embodiment in which no rubber material is provided.
An example will be described. If the noise can be sufficiently reduced by the combination of the sound insulating material 15, the seal plate (damping plate) and the packing as described below, it is not necessary to provide a rubber material.

FIG. 9 shows the shape of the nose cone 3 at the rear end position. At this position, a flange 3a for attaching a vibration-proof rubber (packing) and a seal plate described later is formed.

As shown in FIG. 10, an anti-vibration rubber 11 also serving as a packing is attached to the rear end of the nose cone 3 for watertightness inside the nose cone 3.
A rectangular sealing plate 12 shown in FIG. 1A is fixed by bolts. Anti-vibration rubber 1 that doubles as packing
1 also works effectively to block the solid-borne sound transmitted from the center pod 2. In addition, the electric wire penetration hardware 13 protrudes from the seal plate 12.

The seal plate 12 itself is formed of a damping material,
The sound insulating material 15 may be adhered thereon, as shown in FIGS. 11 (a) and 11 (b).
As shown in (1), a stainless steel plate may be used as the seal plate 12, and a rectangular thin vibration damping material 14 may be attached to the inner surface of the seal plate 12 with the wire penetrating hardware 13 interposed therebetween, and the sound insulating material 15 may be stuck thereon. The sound insulating material 15 is made of the same material as the sound insulating material 15 attached to the inner surface of the nose cone 3 (the side surface excluding the front surface).

FIG. 12 shows the result of confirming the noise reduction effect of the present invention by an actual ship experiment. That is, the noise level of the hydrofoil is determined by the noise level when there is no conventional noise countermeasure and when the noise countermeasure as described in the present application is applied (however, the sound insulation material 15 on the seal plate 12 is not provided in the experiment). It is measured in the state and is shown in the graph. The vertical axis shows the noise level (dB), and the horizontal axis shows the noise frequency (kHz). According to this graph, it was confirmed that when the frequency transmitted and received by the detection sensor is around 50 kHz, a noise reduction effect of 20 dB or more is obtained. If the noise level is reduced by 20 dB, the conventional detection distance becomes about 200
m was doubled in this application, that is, about 40
0 m means that the time to take the evacuation action is about 1 in the state of sailing at a speed of 45 knots.
It can be increased from 0 seconds (requiring fairly agile maneuvering) to about 20 seconds. Therefore, when the invention according to this application is adopted, sufficient time for the evacuating operation is ensured, so that the underwater obstacle can be reliably avoided.

[0035]

In the configuration of claims 1 to 5, according to the present invention, toward the detection sensor incorporated in the submerged body of the hydrofoil in the sea ahead in the traveling direction of the hydrofoil oscillates an ultrasonic wave, the ultrasonic waves By receiving the reflected ultrasonic waves reflected by an underwater obstacle such as a whale that is present in front of the object by the detection sensor, a sufficient detection distance (from the conventional about 200 m to about 400 m from the conventional about 200 m to the conventional one) can be obtained. As a result, the underwater obstacle can be detected as a result, and as a result, it is possible to navigate while reliably avoiding large marine life and suspended matter such as whales and dolphins existing in the water.

[0036] In claim 1, a built-in detection sensor Sen
By attaching a sound insulating material having a significantly different acoustic impedance from water to a part of the tarpod portion other than the detection direction or to the entire side surface, various noises from the outside can be isolated, so that the detection performance can be significantly improved.

Also, a center pocket having a built-in detection sensor is provided.
The surface that comes in contact with seawater is lined or coated with a rubber material for flow noise reduction, so flow noise, which is the dominant obstacle to detection performance, can be significantly reduced, resulting in a significant improvement in detection performance Can be achieved. In some cases, the rubber material at the front end of the center pod in the detection direction is not provided from the viewpoint of preventing transmission loss.

The nose cone is composed of water and an acoustic impedance.
Is made of reinforced plastic that is relatively close
Then, the ultrasonic wave oscillated from the detection sensor makes the nose cone
Ultrasonic waves that pass through and are reflected from the front
The attenuation of the ultrasonic wave when passing through the nose cone is small
As a result, the detection performance is improved accordingly.

Also, there is a separate nose on the head of the center pod.
Nose cone itself because it is a configuration to form nose cone
Is easy to work, and also propagated from the center pod
Effective shielding of noise such as incoming solid-borne noise
You.

In particular, when the rubber material for reducing flow noise is rubber such as chloroprene which has a high noise reduction effect, it is easy to line the submerged body and has high corrosion resistance. It is suitable to withstand use and to obtain a flow noise reduction effect.

In the third aspect, the rear end of the nose cone is
The rubber packing itself sandwiched between the
Works effectively to cut off the
Noise reduction effect, further improving the detection performance.
The above can be achieved.

According to the fourth and fifth aspects, the interposition of a damping material or the like is provided.
Noise reduction effect by even more large Kikunaru.

[Brief description of the drawings]

FIG. 1 is a side view showing a state in which a hydrofoil ship which is an application example of the present application oscillates ultrasonic waves and detects an underwater obstacle.

FIG. 2 is a perspective view showing a state in which an ultrasonic wave is oscillated from a nose cone on the center pod head at the lower end of a front strut of the hydrofoil to detect an underwater obstacle.

FIG. 3 is a horizontal sectional view of the nose cone according to the first embodiment.

FIG. 4 is a side sectional view of the nose cone.

FIG. 5 is a horizontal sectional view of a nose cone according to a second embodiment.

FIG. 6 is a side sectional view of the nose cone.

FIG. 7 is a horizontal sectional view of a nose cone according to a third embodiment.

FIG. 8 is a side sectional view of the nose cone.

FIG. 9 is a front view showing a shape of a nose cone rear end position.

FIG. 10 is a front view of an anti-vibration rubber also serving as a packing.

11A is a front view of a seal plate, and FIG. 11B is a side view thereof.

FIG. 12 is a comparison diagram of noise levels between a conventional ship and an actual ship according to the present invention.

[Explanation of symbols]

 S: High-speed ship (hydrofoil ship) 1: Front strut 1A: Rear strut 2 ... Center pod 3 ... Nose cone 3a ... Flange 4 ... Hydrofoil 5 ... Detector sensor 6 ... Bracket 7 ... Bolt 8 ... Connection box 9 ... Ship Speedometer 10: Rubber material 11: Anti-vibration rubber also serving as packing 12: Seal plate 13: Wire penetrating hardware 14: Damping material 15, 15A: Sound insulation material W: Underwater obstacles (whales)

──────────────────────────────────────────────────続 き Continued on front page (51) Int.Cl. ⁶ Identification code FI G08G 3/02 G08G 3/02 A (72) Inventor Hidekazu Kobayashi 1-1, Kawasaki-cho, Akashi-shi, Hyogo Prefecture Akashi Kawasaki Heavy Industries, Ltd. Inside the factory (72) Inventor Takeo Iimori 3-1-1, Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Kawasaki Heavy Industries, Ltd. 1 Kobe Plant, Kawasaki Heavy Industries, Ltd. (72) Inventor Masaki Omine 3-1-1, Higashikawasaki-cho, Chuo-ku, Kobe City, Hyogo Prefecture 1 Kobe Plant, Kawasaki Heavy Industries, Ltd. 2-1 (56) References JP-A-6-24387 (JP, A) JP-A-62-190480 (JP, A) JP-A-1-126578 (JP, A) JP-A-60-120226 ( JP, A) JP-A-62-45189 (JP, A) JP-A-61-70240 (JP, A) JP-A-4-53576 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , (DB name) B63B 43/20 B63B 1/26 B63B 43/18 B63B 49/00 G01S 7/52

Claims (5)

(57) [Claims] A center is provided at the lower end of a strut of a hydrofoil.
-A pod is installed and water and sound are placed on the center pod head.
Nose of reinforced plastic with relatively close impedance
A cone is formed, and a detection sensor for oscillating ultrasonic waves toward the sea ahead of the hydrofoil in the traveling direction of the hydrofoil ship and receiving ultrasonic waves from the front to detect an underwater obstacle is provided inside the nose cone. Then, a sound insulating material whose acoustic impedance is significantly different from that of water is attached to a part or the whole side surface of the center pod other than the detection direction, and the entire surface of the nose cone in contact with seawater or the front end of the detection direction is excluded. An underwater obstacle detection device, characterized in that a rubber material for reducing flow noise is lined or coated on a side surface. 2. The underwater obstacle detection device according to claim 1, wherein the rubber material for reducing flow noise is a rubber having a high noise attenuation effect such as chloroprene. 3. The hydrofoil is mounted on the center pod.
Has hydrofoil overhanging on both sides, behind the nose cone
Attach the seal plate to the end with rubber packing
The underwater obstacle detection device according to claim 1 or 2,
Place. 4. The method according to claim 1, wherein the seal plate itself is formed of a damping material.
The underwater obstacle detection device according to claim 3, characterized in that: 5. When a damping material is attached to the front side of the sealing plate.
In both cases, sound insulation was applied so as to cover the damping material
The underwater obstacle detection device according to claim 3, wherein: