JPH02278999A - Mount structure of transmitter-receiver - Google Patents

Abstract

PURPOSE:To avoid vibration of a transmitter-receiver from being propagated to a ship's hull and to mount the transmitter-receiver to the ship's hull strongly by fitting the transmitter-receiver of one side radiation type to the position of the node of bending vibration of the resonance plate. CONSTITUTION:The specific gravity, the elastic modulus and the size of a resonance plate 2 are set so that the mounting part of mounting members 4a, 4b is a node 71 of a vibration mode 7 in the bending vibration of a resonance plate 2 when a sound wave radiates in to water at the resonance frequency of the transmitter-receiver 1 while the transmitter-receiver 1 of the resonance plate 2 is fitted to the ships hull 3 via the mounting members 4a, 4b. When a sound wave radiates from the transmitter-receiver 1 into water, since the mount members 4a, 4b are arranged to the position of nodes of the vibration, no vibration takes place and the vibration of the transmitter-receiver 1 is not propagated to the ship's hull. Since the mounting members 4a, 4b are made of a material with high stiffness such as a metal, the transmitter-receiver is held strongly. Thus, the holding of the mount strength and the suppression of the delivery of the vibration to the ship's hull are ensured.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a transducer mounting structure, and is particularly used in sonar, etc., and is a single-sided radiation system that transmits and receives low-frequency sound waves on one side of the transducer. This invention relates to a mounting structure for a type of transducer.

[Conventional technology]

BACKGROUND OF THE INVENTION Single-sided radiation type transducers that are used in sonar and the like and perform reversible conversion between electrical energy and acoustic energy are well known. Conventionally, the mounting structure of this type of transducer was
As shown in the figure, a single-sided radiation type transducer 1 was attached to a hull 3 via a cushion 6. The transducer 1 radiates sound waves into the water by moving its acoustic radiation section 5 in a direction perpendicular to the hull 6.

Because of the reaction caused by this acoustic radiation, the entire transducer/receiver 1 vibrates in a direction perpendicular to the hull 3, so it was attached to the hull via a cushion 6.

[Problem to be solved by the invention]

The conventional transducer mounting structure described above is attached to the ship's hull via a cushion, but in this case, if the cushion is hard, it is unavoidable that the vibrations of the transducer will be transmitted to the ship's hull. However, if the cushion is soft, it will not be possible to securely hold the transducer.

An object of the present invention is to eliminate the above-mentioned drawbacks, to provide a transducer/receiver mounting structure that can significantly suppress transmission of vibrations of the transducer to the ship's hull, and that can be securely held on the ship's hull.

[Means to solve the problem]

In the transducer mounting structure of the present invention, a single-sided emitting transducer that emits ultrasonic waves into water is attached to a resonant plate that bends and vibrates. The plate has a specific gravity of 1 and an elastic modulus of 9 dimensions, and has a structure in which the transducer can be attached to the hull through the nodes of the resonant plate.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a side view of one embodiment of the present invention. 1 is a single-sided radiation type transducer, 2 is a resonance plate, 3 is a hull, 4a and 4
b is a mounting member; 5 is an acoustic radiation part of the transducer 1;

The resonant plate 2 is configured to emit sound waves at the resonant frequency of the transducer 1 underwater with the transducer 1 attached to the hull 3 via the mounting members 4a and 4b. The mounting part is the node 7 of the vibration mode 7 in the bending vibration of the resonance plate 2.
Its specific gravity, elastic modulus, and dimensions are set so that it becomes 1.

When a sound wave is emitted from the transducer 1 into the water, the mounting member 4a
, 4b are located at the vibration nodes, so
It does not vibrate, and therefore the vibrations of the transducer 1 are not transmitted to the hull. Furthermore, since the mounting members 4a and 4b can be made of a highly rigid material such as metal, they can firmly hold the transducer, thereby ensuring both the maintenance of the mounting strength and the suppression of vibration transmission to the hull. Can be installed.

In addition, in the above-mentioned embodiment, the case where two transducers are attached to one resonant plate is shown as an example, but as a modified example, one transducer may be attached to one plate. It goes without saying that it is also possible to mount three or more transducers on one mounting plate by selecting the material and dimensions of the resonant plate.

〔Effect of the invention〕

As explained above, the present invention prevents the vibration of the transducer from being transmitted to the hull by attaching the single-sided radiation type transducer at the bending vibration node position of the resonant plate, and eliminates the need for the transducer to pass through the cushion. Therefore, it has the effect of being able to be firmly attached to the hull.

[Brief explanation of drawings]

FIG. 1 is a side view of an embodiment of the transducer mounting structure of the present invention, and FIG. 2 is a side view of a conventional transducer mounting structure. 1... Transducer/receiver, 2... Resonance plate, 3... Hull, 4
a. 4b...Mounting member, 5...Acoustic radiation section, 6...Cushion, 7...Vibration mode, 71...Node.

Claims (1)

[Claims] A single-sided radiation type transducer that emits ultrasonic waves into water is attached to a resonant plate that vibrates in bending, and the specific gravity, elastic modulus, and dimensions of the resonant plate are set so that the attachment part becomes a vibration node of the resonant plate. , and a transducer mounting structure characterized in that the transducer can be attached to a ship hull via a node of the resonant plate.