Patent Translate Powered by EPO and Google Notice This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate, complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or financial decisions, should not be based on machine-translation output. DESCRIPTION JPS62284278 [0001] The present invention relates to a baffle on which a transducer or the like is fixedly supported in a sonar. [Prior Art] A transducer or the like used in a sonar needs to avoid the influence of unnecessary sound pressure to obtain a predetermined characteristic. Therefore, when constructing a sonar, the transducer or the like is usually specified. It is fixed to and supported by the baffle so as to be an arrangement of As conventional baffles of this type, two types of soft and hard types are known, and as the soft type baffles, for example, a structure in which a small air chamber is sealed with a rubber material such as neoprene Are known. This is intended to make use of the property of air having an extremely low acoustic impedance as compared to water, and aim for completely soft reflection of unnecessary sound pressure incident on the baffle. Also, a hard type buckle is constructed using a rigid material such as metal, which, contrary to the soft type baffle, has a high acoustic impedance compared to water and a 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 buckle function is significantly reduced, and thus under high water pressure There is a problem that it is impossible to use On the other hand, is the hard type baffle an acoustic impedance high enough? In the case of having it, it is necessary to make the thickness of the plate sufficiently large, so that there is a problem that it becomes very heavy to be usable even at low frequencies. The present invention has been made to solve these problems, and it is an object of the present invention to realize a sonar baffle which can be used under high water pressure and which is lightweight and has an excellent buckle function. [Means for Solving the Problems] In order to achieve the above object, the present invention is a damping material mainly composed of rubber on the surface of a water resistant membrane made of a rigid material having a sealed air chamber inside. Is provided. 04-05-2019 1 [Operation] In the present invention having the above-described configuration, of the sound pressure incident on the buckle, the high pressure sound pressure is reflected by the water pressure resistant film, and the low frequency sound pressure transmitted through the water pressure resistant film is It can be totally reflected by the air in the air chamber inside the shell. Further, the resonance phenomenon of the water pressure resistant film and the re-radiation of the sound pressure obliquely incident on the water pressure resistant film are suppressed and reduced by the damping material adhered to the surface of the water pressure resistant film, thereby It prevents the disturbance of the wave field of the wave output. Therefore, according to this, by using the water pressure resistant membrane, the air chamber is not reduced by water pressure, and the use under high water pressure becomes possible, and the water pressure resistant membrane is made of a rigid material However, it is possible to reduce the weight because it is not necessary to increase the thickness of the plate, and to reflect the incident sound pressure completely by the water resistant film and the air chamber, and at the same time the sound field of the receiver output by the damping material. Can be prevented, so that an excellent baffle function that can stabilize the characteristics of the receiver output can be expected. An embodiment will be described below with reference to the drawings. FIG. 1 is a front view showing an embodiment of a baffle for a sonar according to the present invention, in which 1 is a water resistant film, 2 is a damping material (damping material), and 3 is a transducer. The water pressure resistant film 1 is formed of a rigid material such as metal or resin so as to withstand high water pressure, and has, for example, a shape having dome shaped portions on the upper and lower sides of a cylindrical body. Has a sealed air chamber. The damping material 2 is mainly composed of rubber, and the damping material 2fjc is adhered to the surface of the water pressure resistant shell 1 to constitute the sonar baffle of this embodiment, and the transducer 3 is controlled. It is fixed to the outer peripheral surface of the vibrating material 2 in a predetermined arrangement. In the present embodiment, the damping material 2 is stuck over 130% of the wave receiving area and 90 tees of the surface area of the water pressure resistant film 1. Next, to explain the operation of the above-mentioned structure) First, since the water pressure resistant film 1 is formed of a rigid material, this water pressure resistant film itself reflects the incident sound pressure of a constant eclipse, that is, the high pressure sound pressure. Can. Here, although part of the incident sound pressure passes through the water pressure resistant film 1, the water pressure resistant film 1 can withstand high water pressure as described above, so the air chamber inside is not shrunk by water pressure, and therefore The air pressure in the air chamber can completely reflect the sound pressure and low frequency sound pressure transmitted through the water pressure resistance shell 1. The frequency characteristics of the sonar baffle in this example are similar to those of the soft type at low frequencies and near to the hard types 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. On the other hand, since the damping material 2 is mainly composed of rubber, the following functions can be performed without 04-05-2019 2 causing the impedance equivalent to water to the incident sound pressure of the water pressure resistant film 1 and the buckle function of the water pressure resistant film 1. Do. That is, when only the water pressure resistant film 1 made of a rigid material is used as a baffle, a resonance phenomenon occurs in the water pressure resistant shell 1 due to the incident sound pressure, and the sound pressure obliquely incident on the water pressure resistant film 1 Is propagated through the water pressure resistant film 1 and re-radiated, and thereby the sound field at the receiving point of the transmitter / receiver 3 is disturbed, and the directivity of the receiver output is disturbed. Therefore, in the present embodiment, the damping material 2 is attached to the surface of the water pressure resistant film 1, and the resonance of the water pressure resistant film 1 is suppressed by the damping material 2 and the reradiation of the propagation sound pressure is reduced. It is possible to prevent the disturbance of the sound field at the receiving point. FIG. 2 is a diagram showing the horizontal directivity characteristic of the receiver output of the single CH in the embodiment of FIG. 1, where the diameter of the water resistant film 1 with the damping material 2 attached is 75 crn and the measurement frequency is 6 KHz The case of is taken as an example. FIG. 3 shows the horizontal directivity characteristics of the receiver output of a single channel when only the water pressure resistant film 1 is used as a buckle for comparison with the embodiment, and the conditions are the same as in the case of FIG. is there. As is apparent from FIG. 3, the disturbance of the directivity characteristics due to the disturbance of the sound field is large with the water pressure resistant film 1 alone, but in the case of the water pressure resistant film 1 with the damping material 2 attached thereto, In this case, as shown in FIG. 2, disturbance of the directional characteristics does not occur, and it is understood that the damping material 2 prevents disturbance of the sound field. [Effects of the Invention] As described above, according to the present invention, the following effects can be obtained because the damping material is adhered to the surface of the water pressure resistant film whose inside is an air chamber. First, since a water pressure resistant membrane that can withstand high water pressure is used, the air chamber in the water pressure resistant shell is not compressed, and it is possible to use it under high water pressure. In addition, sound pressure reflection can be performed over the entire frequency band because reflection of incident sound pressure is performed by the water pressure resistant film and the air chamber, whereby the water pressure resistance shell has a plate thickness as in the conventional hard type. Since it is not necessary to increase the thickness, it can be made lightweight, and the water pressure resistant membrane has a large buoyancy in the water odor because it contains an air bubble, and the weight in the water is thus further reduced, so the underwater structure It is very advantageous as a thing. Furthermore, the resonance phenomenon of the water pressure resistant film and the re-radiation of the sound pressure obliquely incident on the water pressure resistant film can be suppressed or reduced by the damping material attached to the surface of the water pressure resistant film. Since the disturbance of the wave receiving point of the transducer and the like can be prevented and the stable directivity characteristic can be obtained, 04-05-2019 3 it exhibits an excellent function as a baffle of the transducer and the like in the sonar. [0002] Brief description of the drawings [0003] FIG. 1 is a front view showing an embodiment of a baffle for a sonar according to the present invention, and FIG. 2 is a horizontal orientation of the receiver output when the embodiment is used! FIG. 3 is a graph showing characteristics, and FIG. 3 is a graph showing horizontal directivity characteristics of a receiver output when only a water pressure resistant film is used. 1: Waterresistant film 2: Damping material 3: Transducer patent applicant Applicant Oki Electric Industry Co., Ltd. Attorney Attorney Kimura Toru 2 Front view showing one embodiment of the present invention @ 1 [m 04-05-2019 4
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