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JPS607377

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DESCRIPTION JPS607377
[0001]
The present invention relates to a transducer used in a sonar device or the like to transmit and
receive underwater sound waves. Conventionally, this type of transducer is used by being stored
in a sonar dome provided on the bottom of a watercraft or the like, or in the sail of a 1-m water
ship, as shown in FIG. The m stages of vibrators 1.2 in n height directions in the circumferential
direction are arranged in a cylindrical shape, and the center positions of the vibrator
arrangement in each stage are arranged on the same straight line. And in the conventional sonar,
the used frequency is a single frequency or the used center frequency f. On the other hand, the
frequency change was about. +-. 10%. However, recently, with the increase of ships and the like,
it has become necessary to change the use frequency to prevent sonar interference between
ships. That is, it has become necessary to cope with the broadening of 1.6 or more in the ratio of
the lower limit operating frequency fL and the upper limit operating frequency ? ? with one
sonar transducer. By the way, the transmission level SL converted to the distance of 1 m of the
runner has an acoustic output level tP, a transmission directivity gain t-D1. When closed, it is
shown by the following equation: 5L = 170.8-1-P + 1) IT (, dB) where it is well known that the
detection performance of OdlJ = 11 tPa sonar is proportional to the transmission level, and The
directivity gain is known to decrease as the frequency decreases, and to increase as the acoustic
radiation area is constant. In order to support wide-band operation with one transmitter /
receiver and ensure detection performance even at the lower limit use frequency fL, secure the
transmission level at the lower limit use frequency fL, that is, transmit directivity gain control In
order not to reduce T, it is necessary to design the echo emission area of the transducer to the
lower limit use frequency. As a method of using a sonar, phase change the transducer equivalent
to a part of one circumference, and transmit while rotating the transmission beam where the
center of transmission beam becomes every arrangement pitch in the circumferential direction ?
0 TATINGDIRECTIONALT ? AN 8 MI 88 ION There are ? DT) modes, but the array spacing of
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the transducers is the wavelength ? at the used center frequency fo. It is known that harmful
large side a-ups do not occur in the RDT mode by setting the value to 1/2 or less. Therefore,
conventionally, in order to minimize the number of transducers necessary, the transducer
arrangement interval dt? is approximately ?. / 2 or d / ?. If the inside diameter is 0.5, and the
transducer arrangement number m in the circumferential direction is D, the diameter of the
transducer is @ m * 2?D / ?0. Now, the ratio D / ? of the diameter of the transducer to the
wavelength ? at the lower limit operating frequency fL = 7.5.
Assuming that the ratio H / ? of the height H of the transducer to the wavelength ? == 3.6, the
number of arrangements of transducers according to the prior art is 48 in the circumferential
direction, the height direction The arrangement number n of is the eight-stage arrangement of
FIG. 1 (a), and the ? DT horizontal directivity is as shown in FIG. 2 + a). However, 1 (DT
horizontal directivity) at the upper limit operating frequency fH (fH = 1, 6 fL) is the ratio d / ? ?
20.8 of the wavelength ? ? at the arrangement interval d of the transducers and the upper limit
operating frequency f ? As shown in FIG. 2 (b), a large side lobe is generated which reduces the
indoor ability. On the other hand, when the number of transducer arrays is determined at the
upper limit use frequency fH, the number of arrays m in the circumferential direction is 72, and
the number of arrays n in the height direction is 12 stages, as shown in FIG. Since the ratio d / ?
? of the arrangement interval d to the wavelength ?8 is 0.5, as shown in FIGS. 3 (a) and 3 (b),
the occurrence of a large side lobe can be prevented. However, the number of transducers is
required to be 2.25 times the number based on the lower limit operating frequency fL. In
addition, the increase in the number of arranged transducers has various disadvantages such as
an increase in the cost of manufacturing a transducer, a decrease in reliability, and a
deterioration in maintenance and maintainability. The present invention solves the abovementioned drawbacks in a wide band sonar system using a single transducer, and the number of
transducer arrays is smaller than that of the lower limit working frequency fL, and the number of
transducers is small. It is an object of the present invention to provide a transmitter-receiver that
obtains the same DT directivity as that of the transmitter-receiver. The transducer according to
the present invention is a cylindrical transducer in which m transducers are arranged in the
circumferential direction and n transducers in the height direction, and the transducer
arrangement number is based on the lower limit operating frequency, and the height The
transducers in the odd and even stages of the direction are arranged at shifted positions. Next,
embodiments of the present invention will be described with reference to the drawings. FIG. 4
shows a perspective view of a transducer according to the invention. Ratio D / ? of the diameter
of the transducer to the wavelength ?1 at the lower limit use frequency fL = 7.5. In the case of
the ratio H / ? of the height H of the transducer to the wavelength, H / ? = 3.6, the vibrators 1
and 2 which are electroacoustic transducers 48 in the circumferential direction and 8 in the
height direction An example is shown in which stages are arranged, and the vibrators 1 at odd
stages in the height direction and the vibrators 2 at even stages are arranged by being shifted by
3 and 75 degrees corresponding to ? 7 m at an angle in the circumferential direction. Here, the
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vibrator 1 and the vibrator 2 have the same characteristics. Further, in the vibrator 1 and the
vibrator 2, the ratio of the adjacent arrangement interval d to the wavelength ? corresponding
to the lower limit use frequency fL is d / ?. ???????? In the present embodiment, the ?
DT water directivity is as shown in FIG. 5 (a) at the lower limit operating frequency, as shown in
FIG. 5 (b) at the upper limit operating frequency, and the conventional FIG. 2 (b) There is no large
side lobe as shown in.
FIG. 6 shows transmission directivity gain in this embodiment. The figure which compared the
directivity gain in the case of a prior art is shown. Here, the horizontal axis represents the ratio
fH7fL between the upper limit operating frequency fH and the lower limit operating frequency
fL, and the vertical axis is the relative directivity when the transmission directivity gain at the
lower limit operating frequency fL in the prior art is used as a reference (OdB) The solid line
representing the gain is the change in directivity gain in the case of the prior art, the broken line
is the change in directivity gain in the case of the ninth embodiment, and this embodiment
relates to the t transmission directivity gain. Also, as described above, it can be seen that the
present invention is an arrangement of transducers based on the lower limit working frequency,
as in the above-described five or more, which is superior to the conventional one. By displacing
the transducers of the above, it is possible to realize directivity characteristics equal to or more
than the ? DT directivity of the transducer according to the prior art with a smaller number of
transducers. This effect is most significant when the shift angle is ? 7 m, which corresponds to
172 in the circumferential direction. According to this invention, the manufacturing cost of the
transducer can be significantly reduced, and the reliability can be improved, and the
maintainability can be improved.
[0002]
Brief description of the drawings
[0003]
1 is a perspective view of a conventional transducer, and FIG. 1 (a) is an example of arrangement
based on the lower limit operating frequency, and FIG. 1 (b) is an example of arrangement based
on the upper limit operating frequency 2 (a) and 2 (b) are shown in FIG. 1 (in the case of the
arrangement of al, there is a directivity 3 in FIG. 2 (a), (bl is in the case of the arrangement of
bl).? DT water thousand showing directivity.
2 (a) and 3 (a) show directivity at the lower limit operating frequency, FIGS. 2 (b) and 3 (b) show
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directivity at the upper limit operating frequency, and FIG. 5 is a perspective view of a transducer
according to the invention, FIG. 5 is an directivity according to the embodiment of the present
invention in the RDT water senile water FIG. 5 (a) is a directivity at the lower use frequency, FIG.
5 (b) is an upper use frequency FIG. 6 is a diagram showing a comparison of the prior art
transducer and the directional gain of the transducer according to the embodiment. l и и и и и и и и и и и
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4 ? early C 1 s C J (b) ? / figure
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