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JPS62284279

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS62284279
[0001]
The present invention relates to a baffle on which a transducer or the like is fixedly supported in
a sonar. [Background Art] In order to obtain a predetermined characteristic, it is necessary to
avoid the influence of unnecessary sound pressure in order to obtain a predetermined
characteristic, and therefore, when configuring a sonar, usually, the above-mentioned transducer
is specified. It is fixed to and supported by the baffle so as to be an arrangement of Two types of
conventional baffles of this type are known: soft type and hard type. As the soft type baffle, for
example, one having a structure in which a small air chamber is sealed with a rubber material
such as neoprene is known. It is done. This is intended to make use of the nature of air, which
has an extremely low acoustic impedance compared to water, and to aim for completely soft
reflection of unnecessary sound pressure incident on the buckle. In addition, hard type baffles
are constructed using a rigid material such as metal, which, contrary to the soft type baffles, has
high acoustic impedance compared to water, and rigid reflection. It is aimed at. [Problems to be
Solved by the Invention] However, the above-mentioned two conventional baffles have the
problems described below. That is, the soft type baffle shrinks the air chamber when water
pressure is applied, and as a result, the acoustic impedance approaches water and the sound
permeability becomes good, so the baffle function is significantly reduced, and thus under high
water pressure There is a problem that it is impossible to use On the other hand, when hard
baffles have an acoustic impedance sufficiently higher than water, it is often necessary to make
the thickness of the plate sufficiently thick, so that the problem is that they become very heavy in
order to be usable even at low frequencies. There is. The present invention has been made to
solve these problems, and it is an object of the present invention to realize a novel sonar baffle
which can be used under high water pressure and is light in weight and has sufficient panful
function. [Means for Solving the Problems] In order to achieve the above-mentioned object, the
present invention is directed to a water pressure resistant shell made of a rigid material, the
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outer peripheral surface of which is a mounting surface for mounting a transducer etc. And a
sealed air chamber to be formed. [Operation] In the present invention having the above-described
configuration, of the sound pressure incident on the baffle, the high pressure sound pressure is
reflected by the water pressure resistance shell, and the low frequency sound pressure
transmitted through the water pressure resistance shell is It can be completely reflected by the
air of the air chamber inside the shell. Therefore, according to this, the use of the water pressure
resistant shell makes it possible to use the water chamber under high water pressure since the
air chamber is not reduced by water pressure, and the water pressure resistant shell is made of
metal. Since it is not necessary to increase the thickness of the plate, it is lightweight, and since
the sound pressure can be completely reflected by the water pressure resistant shell and the air
chamber as described above, a sufficient buckle function can be obtained.
An embodiment will be described below with reference to the drawings. FIG. 1 is a front view
showing an embodiment of a sonyni baffle according to the present invention, FIG. 2 is a plan
view thereof, and FIG. 3 is a partially enlarged sectional view. In the figure, 1 is a water pressure
resistant shell formed of a rigid material such as resin or metal so as to withstand high water
pressure, 2 is a sealed air chamber, and the buckle for the sonar of this embodiment is this water
pressure resistant shell 1 And the air chamber 2. More specifically, as shown in FIG. 3, the water
pressure resistant shell 1 comprises a cylindrical body 1a, a dome shaped lid 1b for closing the
upper and lower surfaces of the body 1 &, upper and lower sides of the body 1a. An air chamber
2t-is formed by securing the peripheral portion of the lid 1b to the end face so as to seal the
inside by any method such as welding, bonding or the like. Reference numeral 3 denotes a
transducer, and the transducer 3 is fixed in a predetermined arrangement to the outer peripheral
surface of the water pressure resistant shell 1, more specifically to the outer peripheral surface
of the body 1a forming the water pressure resistant shell 1 together with the lid 1b A cylindrical
cylindrical array is constructed. That is, the outer peripheral surface of the water pressure
resistant shell 1 is used as a mounting surface of the transducer 3, and the transducer 3 is fixed
to this mounting surface so as to form a sonar array. Next, the function of the above-described
configuration will be described. First, since the water pressure resistant shell 1 is formed of a
rigid material such as metal, the water pressure resistant shell 1 itself generates a certain amount
of incident sound pressure, high frequency sound The pressure can be reflected. Here, a part of
the incident sound pressure or low frequency sound pressure passes through the water pressure
shell 1, but since the water pressure shell 1 can withstand high water pressure as described
above, the air chamber 2 inside the water pressure is water pressure Therefore, the sound
pressure transmitted through the water pressure shell 1 can be completely reflected by the air in
the air chamber 2. FIG. 4 is a diagram showing sound pressure output frequency characteristics
at the receiving point of the transducer 3 fixed to the water pressure resistant shell 1 described
above, where the water pressure resistant shell 1 made of rigid material with plate thickness 40
in order is used The case where the acoustic center or reception point of the transducer 3 is
placed 31 mm ahead is shown as an example. In this case, the sound pressure reflectivity of the
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innerr baffle consisting of the water pressure resistant shell 1 and the air chamber 2 is
approximately 1, and the sound pressure transmittance, which is the comparison output with the
case without the baffle, is approximately O, perfect sound insulation effect Is obtained. The
frequency characteristics of the sonar baffle with the above-mentioned configuration are similar
to the soft type at low frequencies, and close to the hard type at high frequencies, and the sound
pressure reflectance is 1 over the entire frequency band. Because the sound pressure
transmittance is close to O, a sufficient baffle function can be obtained.
The shape and the structure of the water pressure resistant shell in the present invention are not
limited to those shown in the illustrated embodiment, and it is a theory that design changes can
be made as needed. [Effects of the Invention] As described above, according to the present
invention, a water pressure resistant water resistant shell made of a rigid material having an
outer peripheral surface as a mounting surface for a transducer etc., and a seal formed by the
water resistant shell. Since the air chamber is provided, the air chamber does not shrink due to
water pressure, and it can be used under high water pressure. In addition, since the water
pressure resistant shell does not need to be thick as in the conventional hard type, it can be
configured to be lightweight, and moreover, the sound pressure is reflected over the entire
frequency band with the water resistant shell and the air chamber. As a result, unnecessary
sound pressure is prevented from affecting the transducers and the like, and a sufficient buckle
function can be obtained. Furthermore, in the present invention, since the water pressure
resistant shell encloses the air chamber, it has a high buoyancy in water, whereby the weight as
the baffle in the water can be made lighter than that of the conventional soft type. Therefore,
there is an advantage that the underwater structure becomes a very advantageous structure.
[0002]
Brief description of the drawings
[0003]
1 is a front view showing an embodiment of a baffle for a sonar according to the present
invention, FIG. 2 is a plan view thereof, FIG. 3 is a partially enlarged sectional view of the
embodiment of FIG. 1, and FIG. It is a figure which shows an example of the sound pressure
output frequency characteristic in the wave receiving point of the transducer attached to a
degree baffle.
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