JPH08177923A - Vibration damping equipment structure - Google Patents

Abstract

PURPOSE: To increase vibration damping performance of a vibration damping equipment structure and to maintain its configuration and performance for a long time by reducing the burden of a storage container consisting of elasticity of the vibration damping equipment. CONSTITUTION: An anchor terminal 13 and a junction member 12 are respectively fixed to both ends of a cylindrical storage container 10 made of an elastic material, and an elastic module 7 is composed by making a connection between the anchor terminal 13 and the junction member 12 with a tensile strength member 15 for regulating tensile force applied to the storage container 1 and also with a cable 4 longer than the tensile strength member 15 for transmitting electric power and signals, while a vibration damping equipment 9 is composed by connecting a mass module 8, through which a cable continuing to the cable 4 is running therein, to the elastic module 7 and a plurality of vibration damping equipment 9 are connected to each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration attenuator for reducing vibrations to a towed body used for underwater exploration and vibrations transmitted from a buoy of a measuring device suspended from a buoy into water.

[0002]

2. Description of the Related Art FIG. 8 is a sectional view showing the structure of a conventional vibration damper. In the figure, reference numeral 1 denotes a hose-shaped storage container that has elasticity so as to expand and contract in the axial direction, and at both ends of it, a towing terminal 2 having an electrical and mechanical connection function is band-tightened, crimped, baked, etc. It is fixed.

A tension member 3 for adjusting the tension applied to the storage container 1 and a cable 4 for transmitting electric power and a signal are connected between the two detention terminals 2. The tensile member 3
Has a surplus length connecting between the two detention terminals 2, and when the storage container 1 extends a predetermined amount, the tensile strength member 3 is fully stretched between the two detention terminals 2 without sagging. Prevent further elongation.

The cable 4 is longer than the length of the tensile strength member 3 and is in a curled state in which the tensile strength member 3 is wound, and the storage container 1 is stretched by a predetermined amount and the tensile strength member 3 is fully stretched. Even in this case, the cable 4 has an extra length and is kept in a curled state, so that the cable 4 is not burdened when the storage container 1 expands and contracts.

In the storage container 1, electrical insulation and
Oil 5 is filled in order to maintain the shape of the storage container 1 against water pressure from the outside. The conventional vibration attenuator 6 is configured as described above. FIG. 9 is a cross-sectional view showing a usage state of the conventional vibration damper having the above structure. As shown in the figure, the vibration attenuator 6 is used in a state in which the storage container 1 is stretched with the length of the tensile member 3 being maximized under the tension. When the vibration received from the ship during use, the cable vibration caused by the towing condition, the array vibration, the vibration caused by the weather condition and the sea condition are transmitted to the vibration damper 6, the storage container 1 expands and contracts due to its own elasticity. , Has the function of damping the transmitted vibration.

[0006]

However, the structure of the conventional vibration damper described above has the following technical limitations. In order to damp the vibration, it depends on the elasticity of the storage container or the composite type of the elasticity of the storage container and the elasticity of the tensile member, and in order to improve the damping performance, the elongation amount and the elongation rate are increased. However, if the amount of expansion is large, the load on the storage container is large, and the internal pressure rise due to deformation and the hose strength are affected. Therefore, it is necessary to design the storage container by limiting the amount of expansion. Further, if the amount of elongation is increased, the amount of deformation of the storage container itself is large, which causes a problem that the shape cannot be maintained for a long time.

There is also a method in which a plurality of vibration dampers are connected and lengthened to increase the composite spring constant and enhance the damping performance. When connecting n elastic bodies in series,
If the respective spring constants are K1, K2, ..., Kn, the combined spring constant K is as follows: 1 / K = 1 / (K1) + 1 / (K2) + ... + 1 / (Kn) Can be represented.

Here, when all the spring constants of the elastic bodies are equal and K1 = K2 ... = Kn = K ',
The composite spring constant K is K = K ′ / n, and FIG. 10 is a graph showing the relationship between the number n of the vibration dampers connected and the composite spring constant K in this case.

As is apparent from the figure, as the number n of connections of the elastic body is increased, the composite spring constant K is decreased. However, when the number of connections exceeds a certain number, it can be seen that the composite spring constant changes only slightly even if the number of connections n is further increased. Therefore, even if the vibration dampers are connected in excess of a certain number, the damping performance is hardly improved.

[0010]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention secures a detention terminal and a relay member to both ends of a cylindrical storage container made of an elastic material, respectively. A tensioning member for adjusting the tension applied to the storage container and a cable for transmitting electric power and a signal longer than the tensioning member are connected to form an elastic module, and the elastic module is a mass module in which the cable is passed inside. To form a vibration attenuator, and a plurality of such vibration attenuators are connected.

[0011]

[Function] When the vibration damper structure is used, tension is applied from the outside in the axial direction of the vibration damper, but in reality, the tension from the outside is constantly changing. Has become. The elastic module expands and contracts to absorb this change in tension, thus dampening the vibration. Although the mass module does not expand and contract, inertial force is exerted by its own mass and resists changes in tension, thus further reducing vibration.

[0012]

1 is a partial sectional view showing an embodiment of the present invention. In the figure, 7 is an elastic module and 8 is a mass module. By connecting the elastic module 7 and the mass module 8, the vibration attenuator 9 of the present embodiment is constructed.

First, the structure of the elastic module 7 will be described. Reference numeral 10 denotes an elastic module side storage container (hereinafter abbreviated as E side storage container), which is a cylindrical container having elasticity and flexibility. Reference numeral 12 is a relay member, which is the E-side storage container 1
It is fixed to the end of 0 by band tightening, caulking, baking, etc.

Reference numeral 13 denotes a convex type detent terminal, which is fixed to the end portion of the E-side storage container 10 on the side not connected to the relay member 12 by band tightening, caulking, baking or the like. Reference numeral 15 denotes an elastic module-side tensile member (hereinafter abbreviated as E-side tensile member), which connects the convex tow terminal 13 and the relay member 12 to adjust the tension applied to the E-side storage container 10. The E-side tensile strength member 15 connects the convex-type detention terminal 13 and the relay member 12 with an extra length, and when the E-side storage container 10 extends a predetermined amount in the axial direction, the E-side tensile strength member 1
5 is in an extended state without sagging, and the E side storage container 1
0 will not grow any further.

The E-side tensile member 15 is made of, for example, aramid fiber having a small elongation. Reference numeral 4 denotes a cable, one end of which is connected to the convex detention terminal 13 and which passes through the E-side storage container 10 and the relay member 12 to pass through the M-side storage container described below and is connected to the recessed detention terminal described below. It will be.

The portion of the cable 4 on the elastic module 7 side corresponds to the E side storage container 10 which expands and contracts in the axial direction.
In a state where the side tensile member 15 is curled so as to be wound, so that the elastic module 7 is not stretched even if it is extended to the maximum extent,
It is stored in the E-side storage container 10 with a sufficient extra length. 5 is oil, which is filled in the E-side storage container 10 and serves to electrically insulate the inside and to maintain the shape of the E-side storage container 10 against water pressure from the outside.

Next, the structure of the mass module will be described.
Reference numeral 11 denotes a mass module side storage container (hereinafter abbreviated as M side storage container), which is a cylindrical container having elasticity and flexibility. A relay member 12 is provided at one end of the M-side storage container 11.
Is fixed by tightening the band, caulking, baking, etc.

Reference numeral 14 denotes a concave type retracting terminal, which is fixed to the end portion of the M-side storage container 11 which is not connected to the relay member 12 by band tightening, caulking, baking or the like.
Reference numeral 16 is a tensile member on the side of the mass module (hereinafter abbreviated as M-side tensile member), which is the concave type retracting terminal 14 and the relay member 1.
It connects with 2 without any extra length. M side storage container 1
Even if tension is applied to No. 1, it does not extend in the axial direction.

The M-side tensile member 16 is also made of a material having a small elongation such as aramid fiber. The material of the M-side tensile member 16 and the above-mentioned E-side tensile member 15 is not limited to aramid fiber, and any material may be used as long as it has a small elongation and can receive axial tension. You may use.

As described above, the cable 4 passes through the relay member 12 from the inside of the E-side storage container 10, passes through the inside of the M-side storage container 11, and is connected at its end portion to the concave retracting terminal 14. The mass module 8 side portion of the cable 4 is the M side storage container 1
Since 1 does not extend in the axial direction, it does not require much extra length and has an appropriate degree of slack, so that the M-side storage container 1
It is stored in 1.

Oil 5 is filled in the M-side container 11 and serves to electrically insulate the inside and to maintain the shape of the M-side container 11 against water pressure from the outside. There is. The elastic module 7 and the mass module 8 described above are connected by the relay member 12 as described above to form the vibration damper 9.

FIG. 2 is a partial sectional view showing an embodiment in which the relay member is separable. Reference numeral 17 denotes an elastic module side relay member (hereinafter abbreviated as E side relay member), which is fixed to the E side storage container 10 by band tightening, caulking, baking or the like. The E-side relay member 17 functions as a retention terminal having an electrical and mechanical connection function, and its shape is similar to that of the concave retention terminal 14.

18 is a relay member for the mass module (hereinafter referred to as M
It is abbreviated as a side relay member. ), And the M-side storage container 11
It is fixed by tightening the band, crimping, baking, etc. The M-side relay member 18 functions as a retention terminal having an electrical and mechanical connection function, and its shape is a convex retention terminal 13.
Is the same as By fitting the E-side relay member 17 and the M-side relay member, the elastic module 7 and the mass module 8
Are connected to form a vibration attenuator.

The convex detent terminals 13 and the concave detent terminals located at both ends of the vibration damper 9 can be fitted to each other, and have an electrical and mechanical connection function. This allows a plurality of vibration dampers 9 to be connected in series. In actual use, the vibration attenuator structure is constructed by connecting a plurality of the vibration attenuators 9 described above.

FIG. 3 is a diagram showing a case where the vibration damper structure according to the present invention is used in a field such as towing of a towed body. In the figure, 19 is a vibration attenuator structure in which a plurality of vibration attenuators 9 composed of an elastic module 7 and a mass module 8 are connected so that the towing side is the elastic module 7.

Reference numeral 20 is a ship, 21 is a tow cable, and 22 is a towed body. FIG. 4 is a diagram when the vibration attenuator structure according to the present invention is used in a field such as an ocean observation buoy. In the figure, 19 is a vibration damper structure,
A plurality of vibration attenuators 9 including an elastic module 7 and a mass module 8 are connected so that the hanging side is the elastic module 7. Reference numeral 23 is a buoy, 24 is a hanging cable, and 25 is an observation instrument.

FIG. 5 is a view showing a usage state of this embodiment. As shown in the figure, tension will be applied from the outside in the axial direction of the vibration damper, but in actual use,
This external tension is constantly changing, which causes vibration. Since the elastic module 7 expands and contracts to absorb this change in tension, the vibration is damped. Although the mass module 8 installed adjacent to the elastic module 7 does not expand or contract, inertial force is exerted by its own mass and resists the change in tension, so that the vibration is further reduced.

The vibrations are from the ship that receives it during use,
There are cable vibrations, array vibrations, weather conditions, and sea conditions that occur in towed states, but these can be effectively eliminated. In the above description, the mass module 8 also has a cylindrical shape, but this is because the entire vibration damper structure can be wound and housed in a drum-like object. 8 may have any shape such as a sphere, an ellipse, or a polygonal column.

FIG. 6 is a diagram showing the calculation result of the amount of vibration transmission by the vibration damper structure of the present invention, and FIG. 7 is a diagram showing a calculation model. For comparison, the calculation results and calculation model of the conventional vibration damper structure are also shown. The figures in the figure are based on the conventional vibration attenuator, and are the calculation results of the vibration transmission amount when the number of the vibration attenuators is one and four, respectively.

The figure shows the result of calculation of the amount of vibration transmission when the vibration attenuator of the present invention is used, and the vibration attenuators in which the elastic module and the mass module are connected are respectively set to two sets and four sets. Here, the elastic module of the vibration damper of the present invention corresponds to a conventional vibration damper, and the calculation parameters are the same. Further, the calculation parameters of the mass module are set as those excluding the spring constant from the calculation parameters of the elasticity module. That is, the elastic module and the mass module have the same length and the same mass.

According to this, is that there is only one conventional vibration attenuator corresponding to one elastic module, and if this length is set to L, then 4 is connected and the length is 4L. Become. Since the length of the mass module is the same as that of the elastic module, since two sets of the vibration attenuator of the present invention in which the elastic module and the mass module are connected are connected, the length is 4L, and four sets are used. Therefore, the length is 8L.

As is apparent from the figure, the vibration damper structure according to the present invention has a significantly improved damping performance as compared with the conventional vibration damper structure. In particular, comparing the conventional type and the present invention, it can be seen that the damping performance is excellent even though the number of elastic modules is half. The lengths of and are the same.

Further, also in the vibration damper structure of the present invention, it is understood that the damping performance is improved by increasing the number of connected vibration dampers. It should be noted that if the number of connected vibration attenuators is increased and the vibration attenuator structure is lengthened, the number of resonances will increase, but this resonance point region is not a practical range.
There is no problem in use.

As described above, by using a plurality of vibration dampers in which the elastic module and the mass module are connected,
The damping performance is greatly improved. Further, since the vibration is damped without relying only on the extension of the elastic module, the deformation of the storage container can be reduced, and the shape and internal pressure of the storage container can be kept normal for a long period of time.

[0035]

As described in detail above, according to the present invention, by using a plurality of vibration attenuators in which a mass module is connected to an elastic module, not only the vibration is attenuated by expansion and contraction of the elastic module, but also the mass module is used. The vibration can be further damped by the inertial force of. This has the effect of significantly improving the vibration damping performance.

Further, since the vibration is also damped by the mass module instead of relying only on the expansion and contraction of the elastic module, even if the elastic module is configured to suppress the expansion,
Sufficient vibration damping performance can be obtained. Therefore, the deformation of the storage container can be reduced, and the shape and internal pressure of the storage container can be kept normal for a long period of time, and the performance of the vibration damper structure can be maintained.

By constructing the mass module by using the elastic cylindrical storage container, the entire vibration damper structure can be wound and stored in a drum-like object, so that it can be transported, expanded and stored. It has the effect of making it easier to handle.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of an embodiment.

FIG. 2 is a partial cross-sectional view showing a detachable relay member of the embodiment.

FIG. 3 is a diagram in which the vibration damper structure of the embodiment is used for towing.

FIG. 4 is a diagram in which the vibration damper structure of the embodiment is used for suspension.

FIG. 5 is a use state of the vibration damper structure of the embodiment.

FIG. 6 is a calculation result of a vibration transmission amount.

FIG. 7 is a calculation model of a vibration damper structure.

FIG. 8 is a sectional view showing a conventional vibration damper.

FIG. 9 is a cross-sectional view showing a usage state of a conventional vibration damper.

FIG. 10 is a graph showing the relationship between the number of connected conventional vibration dampers and the composite spring constant.

[Explanation of symbols]

 4 Cable 5 Oil 7 Elastic Module 8 Mass Module 9 Vibration Damper 10 E-Side Storage Container 11 M-Side Storage Container 12 Relay Member 13 Convex Detention Terminal 14 Recessed Detention Terminal 15 E-Side Strength Member 16 M-Side Strength Member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Nobuyuki Yoshitake 6-11-23-201 Hino, Konan-ku, Yokohama-shi, Kanagawa Prefecture (72) Kyoji Yoshikawa 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. In-house (72) Inventor Kenichi Machida 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd.

Claims (3)

[Claims] 1. A tensile strength member for fixing a tension terminal and a relay member to both ends of a cylindrical container made of an elastic material, and adjusting a tension applied to the container between the tension terminal and the relay member. A vibration attenuator is configured by connecting a cable for transmitting electric power and a signal longer than the tensile strength member to form an elastic module, and connecting a mass module in which a cable continuous to the cable is passed inside to the elastic module. A vibration attenuator structure is characterized in that a plurality of the vibration attenuators are connected. 2. The mass module according to claim 1,
A relay member and a tension terminal are respectively fixed to both ends of a cylindrical storage container made of an elastic material, and a tension member in which the relay member and the tension terminal are connected with no extra length, and a power longer than the tension member. A vibration attenuator structure characterized by being connected with a cable for transmitting a signal. 3. The vibration damper structure according to claim 1 or 2, wherein the container is filled with oil.