JP4027528B2 - Sound material performance measuring device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an acoustic material performance measuring device for measuring the acoustic performance of an acoustic material (sound absorbing material and sound transmitting material) under high water pressure, and more specifically, using high water pressure in the deep sea as a measurement environment, The present invention relates to an acoustic material performance measuring apparatus capable of performing the measurement work with high efficiency.
[0002]
[Prior art]
In order to confirm the acoustic performance of an acoustic material such as a sound absorbing material and an acoustic transmission material used under high water pressure, it is necessary to measure the acoustic performance in a high water pressure measurement environment.
[0003]
Conventionally, as a method for measuring the acoustic performance of an acoustic material under high water pressure, a sample is installed together with an acoustic measuring device in a large water pressure tank, and measurement is performed in a state where the internal pressure of the tank is increased.
[0004]
However, when acoustic performance is measured in a hydraulic tank, reflection and scattering of sound waves occur, so if the sample is a sound-absorbing material, the measurable frequency range is limited to the high frequency band in consideration of the wavelength and the near field. End up. When the sample is a sound transmitting material, it is necessary to make the sample larger than a predetermined size in order to avoid diffraction of sound waves. Therefore, it is difficult to measure acoustic performance unless it is a considerably large hydraulic tank.
[0005]
Therefore, instead of using a water pressure tank as described above, it is conceivable to suspend an acoustic measuring instrument attached with a sample from the ship to the sea and use the high water pressure in the deep sea as a measurement environment. However, since it takes a lot of time to hang an acoustic measuring instrument from the ship to the deep sea and to take it up after the measurement is completed, it is very efficient to simply suspend a set of acoustic measuring instruments from the ship. In addition, there is a possibility that the measurement conditions of a plurality of samples vary. On the other hand, when multiple sets of acoustic measuring instruments are suspended from the ship at the same time, it is difficult to suspend the acoustic measuring instruments to the deep sea because the total weight of these acoustic measuring instruments and communication cables becomes excessive. .
[0006]
[Problems to be solved by the invention]
An object of the present invention is to enable measurement of acoustic performance from a low frequency band to a high frequency band under high water pressure by using high water pressure in the deep sea as a measurement environment, and to perform the measurement work efficiently. An object of the present invention is to provide an acoustic material performance measuring apparatus that makes it possible.
[0007]
[Means for Solving the Problems]
Acoustic material performance measuring device of the present invention for achieving the above object, as well as interpolation by bundling at least a communication cable and a power cable, is interposed a filler in the gap of these cables, the steel wire layers on the outer circumference A platform is suspended from a ship via an armor cable covered with an exterior material , and a plurality of sets of acoustic measuring devices are mounted on the platform, and an underwater electronic unit that switches between the plurality of sets of acoustic measuring devices is mounted on the platform. The communication cable is connected to the underwater electronic unit and is installed in a pressure vessel .
[0008]
In this way, by suspending the platform equipped with an acoustic measurement device from the ship and using the high water pressure in the deep sea as the measurement environment, it is possible to measure the acoustic performance from the low frequency band to the high frequency band under high water pressure. It becomes possible. Moreover, since the platform includes a plurality of sets of acoustic measuring devices, highly efficient measurement work can be performed under the same conditions.
[0009]
The acoustic material performance measuring device is configured to interpolate by bundling a communication cable and a power cable from the ship, is interposed a filler in the gap of these cables, armor cable coated with a sheathing material composed of a steel wire layer on the outer periphery By hanging the platform via the cable, it is possible to prevent these cables from being subjected to tension, and to switch the plurality of sets of acoustic measuring instruments by controlling the underwater electronic unit. Since the number of communication cables is standardized and the number of the cables is reduced and the entire apparatus is lightened, the length of the armor cable can be increased and the acoustic measuring instrument can be suspended to the deep sea. Thus, by suspending the acoustic measuring instrument to the deep sea, it becomes possible to realize a measurement environment with high water pressure and eliminating the influence of sound wave reflection and the like.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 illustrates an acoustic material performance measuring apparatus according to an embodiment of the present invention. In the figure, a carriage 1 is equipped with a winch drum 2 that can be driven to rotate, and the armor cable 3 can be wound up by the rotation of the winch drum 2. A frame crane 4 is disposed at the edge of the carriage 1, and the tip of the armor cable 3 is suspended toward the sea with a reel block 5 attached to the frame crane 4 as a fulcrum. The rear end of the armor cable 3 is connected to the acoustic material measurement system 8 via the land connection cable 6 and the line connector 7.
[0011]
The underwater part is comprised as follows with respect to the ship upper part mentioned above. That is, the front end side of the armor cable 3 is connected to the platform 10 via the retaining bracket 9. This platform 10 is equipped with a plurality of sets of acoustic measuring instruments 12 via ladder-like measuring jigs 11. Each acoustic measuring device 12 includes a transmitter that transmits sound waves, a substrate that fixes a sample of an acoustic material in a sound wave transmission path, and a receiver that receives sound waves reflected by the sample. These acoustic measuring instruments 12 are detachable from the platform 10 together with the measuring jig 11.
[0012]
FIG. 1 shows a setting for low frequencies. In FIG. 1, a measuring jig 11 includes two sets of acoustic measuring devices 12, and reflects sound waves transmitted from low-frequency transmitters SAL and SBL by samples S1 and S2, respectively, and receives the reflected sound. The devices MA and MB are configured to receive. On the other hand, FIG. 2 shows a setting for high frequency. In FIG. 2, the measurement jig 11 includes four sets of acoustic measuring devices 12, which are transmitted from a medium frequency transmitter SAM, a high frequency transmitter SAH, a medium frequency transmitter SBM, and a high frequency transmitter SBH. Sound waves are reflected by the samples S1, S2, S3, and S4, respectively, and the reflected sound is received by the receivers MA and MB. However, the receiver MA is common to the transmitters SAM and SAH, and the receiver MB is common to the transmitters SBM and SBH.
[0013]
The platform 10 is attached with an underwater electronic unit 13 in which an electronic unit for switching a plurality of sets of acoustic measuring devices 12 is built in a pressure resistant container. The underwater electronic unit 13 is connected to a communication cable or a power cable inserted in the armor cable 3. The communication cable is a cable for transmitting signals of a transmission system, a reception system, a water temperature / depth detection system, and a signal switching system. In addition, a sensor 14 for measuring the water temperature and depth is attached to the measuring jig 11. This sensor 14 may be one that transmits the water temperature and depth to the ship in real time, or may be one that records water temperature and depth data over time.
[0014]
FIG. 3 shows a cross-sectional structure of the armor cable. As shown in FIG. 3, the armor cable 3 bundles one coaxial cable 21 (communication cable), a plurality of signal cables 22 (communication cables), and a plurality of power lines 23 (power cables). In order to ensure the water pressure resistance in the gap, a sheath material 25 made of black polyurethane is covered with a filler 24 interposed, and an outer covering material 26 made of two steel wire layers is covered around the sheath material 25. Yes. The armor cable 3 transmits signals and supplies power via the coaxial cable 21, the signal cable 22, and the power line 23, and the exterior material 26 on the outer side of the armor cable 3 can withstand the total weight of the underwater part and the weight of the cable that has been fed out. It is designed to exhibit strength that enables suspension and lifting of the underwater part. As various cables, optical fibers may be used in addition to metal wires.
[0015]
In the armor cable 3, it is preferable to use the coaxial cable 21 for communication in a transmission system. A signal cable 22 may be used for communication in the reception system, the water temperature / depth detection system, and the signal switching system. The power supply system is preferably distributed over a plurality of power supply lines 23 so as not to affect the signal as much as possible. Each of the signal cable 22 and the power supply line 23 is provided with a vacant line to ensure redundancy when a trouble occurs.
[0016]
FIG. 4 is a block diagram of the underwater electronic unit. In the figure, ● is a terminal for the armor cable 3 and ○ is a terminal for the transducer. As shown in FIG. 4, in the channel selection unit 31, the channel selector 33 drives the relay driver 34 based on the control signal input via the input / output circuit 32. The selected channel detection circuit 35 detects the channel selected by the relay driver 34 and outputs it to the outside.
[0017]
The relay driver 34 drives the relays RL1 and RL5 when the channel is Ch0, drives the relays RL2 and RL5 when the channel is Ch1, drives the relays RL3 and RL6 when the channel is Ch2, and drives the relays RL4 and RL6 when the channel is Ch3. It comes to drive. These relays RL1 to RL6 turn on the switches SW1 to SW6, respectively, in the driving state.
[0018]
In the setting for low frequency shown in FIG. 1, measurement of the sample S1 can be performed when the channel is Ch0, and measurement of the sample S2 can be performed when the channel is Ch2. On the other hand, in the high frequency setting shown in FIG. 2, the measurement of the sample S1 is performed when the channel is Ch0, the measurement of the sample S2 is performed when the channel is Ch1, the measurement of the sample S3 is performed when the channel is Ch2, and the measurement is performed when the channel is Ch3. Sample S4 can be measured. In addition, it is preferable to equip the relay also with a preliminary relay to ensure redundancy when a trouble occurs.
[0019]
The underwater electronic unit 13 includes two constant voltage power supply units 36 and 37, and these constant voltage power supply units 36 and 37 are connected to power supplies (± 24V and ± 15V) provided in the carriage 1, respectively. The depth processing circuit 38 corrects the depth detected by the depth sensor 39 and outputs it to the outside.
[0020]
In the acoustic material performance measuring apparatus described above, the platform 10 equipped with the acoustic measuring device 12 is suspended from the top of the carriage 1 and the high water pressure in the deep sea is used as a measurement environment. It is possible to measure acoustic performance from a low frequency band to a high frequency band. The setting for the low frequency and the setting for the high frequency can be performed simply by exchanging the measurement jig 11 to which a plurality of sets of acoustic measuring devices 12 are attached.
[0021]
Moreover, since the platform 10 includes a plurality of sets of acoustic measuring devices 12 and can simultaneously measure the acoustic performance of a plurality of samples, the measurement work can be performed efficiently. In addition, since the same condition is always applied to a plurality of samples suspended at the same time, measurement can be carried out without worrying about variations in measurement conditions even when the marine weather changes in a short time. In addition, since the said measuring apparatus is provided with various sensors, the water temperature and water depth at the time of measurement can always be grasped | ascertained on the trolley 1.
[0022]
In the above-described acoustic material performance measuring apparatus, the platform 10 is suspended from the carrier 1 via the armor cable 3 in which various cables including the coaxial cable 21, the signal cable 22, and the power line 23 are inserted. The cable is not subjected to tension. In addition, since the underwater electronic unit 13 for switching the plural sets of acoustic measuring devices 12 is installed, a common communication cable for the plural sets of acoustic measuring devices 12 should be used inside the armor cable 3. Can do. Therefore, the number of communication cables can be reduced and the entire apparatus can be reduced in weight.
[0023]
In the acoustic material performance measuring apparatus according to the present invention, it is possible to increase the length of the armor cable 3 by avoiding the tension load on the communication cable and reducing the weight of the entire apparatus. It can be hung. Thus, by suspending the acoustic measuring instrument to the deep sea, it becomes possible to realize a measurement environment with high water pressure and eliminating the influence of reflection of sound waves and the like. In addition, reducing the number of communication cables makes it possible to place a spare cable inside the armor cable 3, which improves the redundancy in the event of a trouble, and thus the operability and reliability of the entire device. It contributes to the improvement.
[0024]
In the above-described embodiment, the measurement of the acoustic performance (reflection sound attenuation performance) of the sound absorbing material is mainly described. However, by changing the configuration of the acoustic measuring device mounted on the platform, other acoustic characteristics such as acoustic transmission performance can be obtained. It can also be applied to performance measurement.
[0025]
【The invention's effect】
According to the present invention described above, as well as interpolation by bundling at least a communication cable and a power cable, is interposed a filler in the gap of these cables were coated exterior material made of steel wire layer on the outer periphery A platform is suspended from the ship via an armor cable, and a plurality of sets of acoustic measuring devices are mounted on the platform, and an underwater electronic unit for switching between a plurality of sets of acoustic measuring devices is installed in the platform and installed in a pressure vessel . By connecting a communication cable to the underwater electronics, acoustic performance can be measured over a wide range of frequency bands from a low frequency band to a high frequency band under high water pressure in the deep sea. The measurement work can be efficiently performed under the same conditions.
[Brief description of the drawings]
FIG. 1 is a side view showing a setting for low frequency of an acoustic material performance measuring apparatus according to an embodiment of the present invention.
2 is a side view of an essential part showing a setting for high frequency of the acoustic material performance measuring apparatus of FIG. 1; FIG.
FIG. 3 is a cross-sectional view of an armor cable used in the acoustic material performance measuring apparatus shown in FIG.
4 is a block diagram of an underwater electronic unit used in the acoustic material performance measuring apparatus of FIG. 1. FIG.
[Explanation of symbols]
1 Ship 2 Winch drum 3 Armor cable 10 Platform 11 Measuring jig 12 Acoustic measuring device 13 Underwater electronics 14 Sensor MA, MB Receiver S1, S2, S3, S4 Sample SAL, SBL Low frequency transmitter SAM, SBM medium frequency transmitter SAH, SBH high frequency transmitter

Claims (2)

While the interpolation by bundling at least a communication cable and a power cable, is interposed a filler in the gap of these cables, down hanging platform on board through the armor cable coated with a sheathing material composed of a steel wire layer on the outer periphery A plurality of sets of acoustic measuring devices are mounted on the platform, and an underwater electronic section for switching the plurality of sets of acoustic measuring instruments is installed in the pressure-resistant container, and the communication cable is attached to the underwater electronic section. Sound material performance measuring device connected with Acoustic material performance measuring device of claim 1 in which the detachable measurement jig fitted with the plurality of sets of acoustic instrument with respect to the platform.

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