JP3811640B2 - Reinforcement structure of sonar dome - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reinforcing structure for a sonar dome, and more particularly to a reinforcing structure for a spindle-shaped sonar dome having excellent durability for protecting an underwater transducer for a high frequency band.
[0002]
[Prior art]
In order to search for an underwater object, an underwater transducer that attaches a transducer to the bottom of the ship and transmits sound waves, receives and analyzes the reflected sound from the target object and the sound waves generated by the object, It is sealed and stored in a sonar dome (protective container) in order to suppress the impact of obstacles such as driftwood during navigation and noise generated by navigation.
[0003]
FIG. 5 shows a schematic diagram of an underwater transducer and a sonar dome for storing the underwater transducer, and an underwater transducer 1 attached to the bottom of a ship (not shown) is formed in a spindle shape to reduce resistance in the water during navigation. The rubber or resin sonar dome 2 is housed.
[0004]
As described above, the sonar dome 2 is required to have a sufficient strength so that the sonar dome 2 is not affected by the impact of an obstacle during navigation, and can sufficiently withstand internal pressure. In the sonar dome 2 in the frequency band, rubber or resin reinforced with a fiber material is used in relation to sound transmission performance.
[0005]
A spindle-shaped sonar dome 2 made of a conventional rubber material for a high frequency band is made of chloroprene rubber as a rubber material and poly-p-phenylene as a reinforcing fiber material in order to keep the sound transmission loss level in water as low as possible. A terephthalamide fiber is preferably used, and its reinforcing structure is composed of one reinforcing layer made of organic fiber cords arranged in parallel in the longitudinal direction and two layers of organic fiber cords arranged in parallel in the circumferential direction perpendicular thereto. -It has been composed of a reinforcing layer made of metal.
[0006]
Here, since the sonar dome 2 has a spindle-shaped dome shape, when viewed from an inclined surface, each of the reinforcing cords has a longitudinal direction X and a circumferential direction Y as shown in FIG. They are arranged in parallel.
[0007]
[Problems to be solved by the invention]
However, such a spindle-shaped sonar dome reinforcing structure has a defect that the strain on the organic fiber cords arranged in the longitudinal direction is increased, and it is difficult to increase the pressure resistance of the sonar dome.
[0008]
The object of the present invention is to improve the pressure resistance performance and durability by devising the arrangement angle of these organic fiber cords while maintaining the sound transmission loss level by using organic fiber cords equivalent to conventional ones. An object of the present invention is to provide a sonar dome reinforcing structure for a high frequency band excellent in performance.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the sonar dome reinforcing structure of the present invention includes at least one reinforcing layer composed of organic fiber cords arranged in parallel in the longitudinal direction, and ±± The gist of the invention is that it is composed of a rubber layer reinforced by a reinforcing layer composed of at least two or more even layers composed of organic fiber cords arranged in parallel at an equal angle of 1 to 40 °.
[0010]
The angle formed with the circumferential direction of the organic fiber cords arranged in parallel inclined in the circumferential direction is preferably ± 5 to 35 °.
[0011]
In addition, another sonar dome reinforcing structure of the present invention has one or more reinforcing layers made of organic fiber cords arranged in parallel in the circumferential direction, and at an equal angle of ± 40 to 80 ° with respect to the circumferential direction. The gist of the invention is that it is composed of a rubber layer reinforced by a reinforcing layer composed of two or more even layers composed of inclined organic fiber cords arranged in parallel.
[0012]
The angle formed between the organic fiber cords arranged in parallel and inclined in the circumferential direction is preferably ± 45 ° to 65 °.
[0013]
Thereby, the tension | tensile_strength assignment concerning the organic fiber cord of 3 or more layers can be averaged, and the pressure resistance performance of a protective container can be improved and durability can be improved.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0015]
In each figure, the same constituent elements are denoted by the same reference numerals, and redundant description is omitted.
[0016]
FIG. 1 omits a part of a code for explaining the arrangement direction of an organic fiber code (hereinafter also referred to as a cord) that reinforces a sonar dome (protective container) according to the first embodiment of the present invention. In the plan view shown, the sonar dome 2 includes an organic fiber cord 3 arranged in parallel to the longitudinal direction and an organic fiber cord arranged in parallel inclined at an equal angle of ± α ° with respect to the circumferential direction. -Reinforced by a two-layered reinforcing layer consisting of four, five.
[0017]
The angle α is 1 to 40 °, preferably 5 to 35 °. Thereby, it is possible to average the tension applied to each of the organic fiber cords 3, 4, 5, improve the pressure resistance performance of the protective container 2, and improve the durability.
[0018]
Here, if the angle is less than 1 °, the effect of reducing the tension cannot be obtained, and if it exceeds 40 °, a larger tension is generated than in the prior art, or the shape retainability deteriorates.
[0019]
Each of the cords 3, 4, and 5 is covered with a rubber material at the upper and lower surfaces, laminated, and further covered with a rubber material to form the sonar dome 2.
[0020]
The rubber material is preferably chloroprene rubber in order to keep the sound transmission loss level in water as low as possible, and the reinforcing fiber material is preferably poly-p-phenylene terephthalamide fiber from the same viewpoint.
[0021]
The thickness of the entire rubber layer including the reinforcing layer constituting the sonar dome 2 is adjusted to 3 to 15 mm, preferably 5 to 10 mm, from the viewpoint of withstanding the impact received during navigation and suppressing the sound transmission loss level.
[0022]
FIG. 2 is a plan view similar to FIG. 1 showing another embodiment for explaining the arrangement direction of the cords for reinforcing the sonar dome of the present invention. The sonar dome 2 is arranged in parallel to the circumferential direction. Reinforced by two layers of organic fiber cord 6 and organic fiber cords 7 and 8 arranged in parallel and inclined at an equal angle of ± β ° with respect to the circumferential direction.
[0023]
The angle β is 40 to 80 °, preferably 45 to 65 °. Thereby, it is possible to average the tension applied to each of the organic fiber cords 6, 7, and 8 and improve the pressure resistance performance of the protective container 2.
[0024]
Here, if the angle is less than 40 °, a larger tension is generated than in the conventional technique, and if it exceeds 80 °, a larger tension is generated than in the conventional technique.
[0025]
The embodiment of FIG. 2 is different from the configuration of the embodiment of FIG. 1 in that the arrangement angle of each code as a reinforcing layer is different, and the other configurations are the same as those of the embodiment of FIG. The description to be omitted is omitted.
[0026]
[Example 1]
Aramid fiber (du Pont Kevlar: poly-p-phenylene terephthalamide fiber) 1500d / 2 as an organic fiber code is parallelized on a rubber sheet made of chloroprene rubber having a thickness of 0.5 mm, and 25 fibers per 5 cm. Then, a reinforcing layer in which an organic fiber cord was embedded by setting a chloroprene rubber having a thickness of 0.5 mm on the upper side was set.
[0027]
One layer of this reinforcing layer is arranged so that the code direction is in the longitudinal direction, and the inclination angles (α) in the code direction with respect to the circumferential direction are ± 20 °, 30 °, 40 respectively on the upper and lower surfaces thereof. Four kinds of protective containers having a total thickness of 8 mm were designed by placing them at 50 ° and covering the upper and lower surfaces with chloroprene rubber.
[0028]
When the inner pressure of the protective container designed as described above is sealed, the tension acting on the cord in the longitudinal direction and the cord inclined in the circumferential direction is calculated in relation to the inclination angle α, and this is calculated using the conventional reinforcing structure ( The maximum tension of the cord in the longitudinal direction (1 layer, 2 layers in the circumferential direction) is set to 1.0 and compared with this, the former tension ratio is “− ○ −” and the latter tension ratio is “− □ −”. These are shown on the vertical axis of FIG.
[0029]
In addition to FIG. 3, the deformation amount of the protective container at the time of filling with the internal pressure is compared with the deformation amount of the protective container having the conventional reinforcing structure as 1.0, and the ratio of the deformation amount is “−”. “-” Is shown on the vertical axis.
[0030]
As a result, it was possible to reduce the tension of the cord by about 20% or more when the inclination angle α = 30 °, and it was confirmed that the tension was reduced as a whole when the inclination angle α was 1 to 40 °.
[0031]
Further, it was confirmed that the deformation amount was reduced by about 30% at the inclination angle α = 30 °, and the deformation amount was reduced as a whole when the inclination angle α was 1 to 45 °.
[0032]
[Example 2]
The same reinforcing layer as in Example 1 is arranged so that the code direction is in the circumferential direction, and the upper and lower surfaces thereof have inclination angles (β) in the code direction of ± 30, 40 respectively with respect to the circumferential direction. Five kinds of protective containers were designed so that the total thickness would be 8 mm by placing them at an angle of 50 °, 60 °, and 70 ° and covering the upper and lower surfaces with chloroprene rubber.
[0033]
When the inner pressure of the protective container designed as described above is sealed, the tension acting on the cord in the circumferential direction and the cord inclined in the circumferential direction is calculated in relation to the inclination angle β. (1 layer in the direction, 2 layers in the circumferential direction) The maximum tension of the cord is set to 1.0 and compared with this, the former tension ratio is “− ○ −” and the latter tension ratio is “− □ −”. Each is shown on the vertical axis of FIG.
[0034]
In addition to the above, FIG. 4 shows the amount of deformation of the protective container at the time of filling with the internal pressure as 1.0 as the amount of deformation of the protective container having the conventional reinforcing structure, and compares the amount of deformation with “−”. “-” Is shown on the vertical axis.
[0035]
As a result, it became possible to reduce the tension of the cord by about 20% or more at the inclination angle β = 60 °, and it was confirmed that the tension was reduced when the inclination angle β was 40 to 70 ° as a whole.
[0036]
Further, it was confirmed that the deformation amount was reduced by about 40% at the inclination angle β = 60 °, and the deformation amount was reduced at the inclination angle β of 35 to 70 ° as a whole.
[0037]
In addition, the structure of the sonar dome 2 of each of the above embodiments includes the one-layer organic fiber cords 3 arranged in parallel in the longitudinal direction and the parallel slants inclined at equal angles of ± α ° with respect to the circumferential direction. A description has been given of what is reinforced by a two-layer reinforcing layer composed of arranged organic fiber cords 4 and 5, but a plurality of organic fiber cords 3 and an even number of organic fiber cords of two or more layers. Application is also possible in the case of reinforcement with 4 and 5.
[0038]
Further, two layers of organic fiber cords 6 arranged in parallel in the circumferential direction and organic fiber cords 7 and 8 arranged in parallel and inclined at an equal angle of ± β ° with respect to the circumferential direction, respectively. The case where the reinforcing layer is reinforced with a plurality of organic fiber cords 6 and organic fiber cords 7 and 8 of two or more even layers can be applied.
[0039]
【The invention's effect】
As described above, the present invention maintains the sound transmission loss level by using multiple layers of reinforcing cords equivalent to the conventional one, and devise only the arrangement angle of these cords to devise each cord. -The tension applied to the door could be averaged.
[0040]
As a result, the pressure resistance performance as the sonar dome can be improved, and as a result, the durability of the sonar dome can be improved.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a plan view with a part of a cord omitted for explaining the arrangement direction of a cord for reinforcing a sonar dome according to a first embodiment of the present invention.
FIG. 2 is a plan view in which a part of a cord for explaining the arrangement direction of a cord for reinforcing a sonar dome showing a second embodiment of the present invention is omitted.
FIG. 3 is a graph for explaining the characteristics of the sonar dome of the present invention reinforced by the first embodiment shown in FIG. 1;
FIG. 4 is a graph for explaining the characteristics of the sonar dome of the present invention reinforced by the second embodiment shown in FIG. 2;
FIG. 5 is an explanatory diagram for explaining the outline of an underwater transducer and a spindle-shaped sonar dome that houses the underwater transducer.
FIG. 6 is a perspective view for explaining the arrangement direction of cords for reinforcing a conventional spindle-shaped sonar dome.
[Explanation of symbols]
1 Underwater transducer 2 Sonar dome 3, 4, 5, 6, 7, 8 Organic fiber cord

Claims (4)

From at least one reinforcing layer composed of organic fiber cords arranged in parallel in the longitudinal direction, and organic fiber cords arranged in parallel inclined at an equal angle of ± 1 to 40 ° with respect to the circumferential direction. A sonar dome reinforcement structure comprising a rubber layer reinforced with a reinforcement layer comprising at least two or more even layers. The reinforcing structure of a sonar dome according to claim 1, wherein an angle formed with the circumferential direction of the organic fiber cords arranged in parallel inclined in the circumferential direction is ± 5 to 35 °. It consists of one or more reinforcing layers composed of organic fiber cords arranged in parallel in the circumferential direction, and organic fiber cords arranged in parallel that are inclined at an equal angle of ± 40 to 80 ° with respect to the circumferential direction. A reinforcing structure of a sonar dome composed of a rubber layer reinforced by a reinforcing layer composed of two or more even layers. The reinforcing structure for a sonar dome according to claim 3, wherein an angle formed between the organic fiber cords arranged in parallel and inclined in the circumferential direction is ± 45 ° to 65 °.

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