KR20030089148A - Apparatus for testing the characteristics of vibration cutoff in array sonar system - Google Patents

Abstract

PURPOSE: An apparatus for testing oscillation isolation of an in-line arrayed sound navigation and ranging is provided to improve the accuracy of oscillation isolation on land by applying a tensile force to the in-line arrayed sound navigation and ranging. CONSTITUTION: A water tank(1) is formed to contain water therein. An acoustic sensor(2) is buried in the water of the water tank(1). A vibration generator(30) is installed on a side of the acoustic sensor(2) and applies vibration to the acoustic sensor(2) in a longitudinal direction. A tensile unit(40) is installed on an opposite side of the vibration generator(30) with the acoustic sensor(2) between and applies a tensile force to the acoustic sensor(2). An oscillation sensor(60) is installed on the tensile unit(40) in order to measure oscillation of the acoustic sensor(2) toward the tensile unit(40). An oscillation sensor(50) is installed on the vibration generator(30) in order to measure applied vibrational oscillation of the vibration generator(30).

Description

Line Array Sound Wave Detector Vibration Blocking Characteristic Test Equipment {APPARATUS FOR TESTING THE CHARACTERISTICS OF VIBRATION CUTOFF IN ARRAY SONAR SYSTEM}

The present invention relates to an apparatus for testing vibration blocking characteristics of a line array sound wave detector, and more particularly, by applying a tensile force to a line array sound wave detector, a line array sound wave vibration capable of testing the vibration blocking characteristics of the line array sound wave detector more accurately on land. The present invention relates to a test device for breaking characteristics.

Prearranged sonar means that hydrophones are linearly arranged at regular intervals to detect and identify targets by analyzing signals generated by underwater sound waves.

1 is a block diagram schematically showing a general sound detector, which detects an underwater acoustic signal, converts it into an electrical analog signal, and converts it back into a digital signal and then transmits it; A towing cable 200 connected to the acoustic sensor 300; A signal processor 120 connected to the towing cable 200 and transmitting the electrical signal received from the acoustic sensor 300, and a data processor 110 for classifying, searching, and processing the electrical signal data received from the signal processor 120. It is composed of a ship 100 having a).

In addition, the acoustic sensor 300 is a vibration isolation module (310) for blocking the longitudinal vibration generated from the tug to transmit the acoustic module 330, and converts the input analog signal into a digital signal It consists of a signal transmission module 320 for transmitting, an acoustic module 330 for detecting an acoustic signal, and a tail rope assembly 340 for finally attenuating vibration.

The sound wave detection performance of the line array sound wave detector is affected by the self noise generated in the acoustic sensor. This self-noise is generated by vibration and fluid noise from the towing cable.

Therefore, there have been studies to grasp the vibration characteristics and vibration blocking performance of the sound wave detector against such vibrations.

However, when the vibration characteristics and the vibration blocking performance test of the acoustic sensor of the line array sonar operated in water are actually carried out on the ship at sea, much manpower, time and cost are required.

Figure 2 shows the vibration blocking land test apparatus of the conventional line array sound wave detector.

As shown, a plurality of support ropes 510 are suspended on a support structure 500 such as a ceiling, and the line array sound wave detector 520 is connected to the support ropes 510. In addition, the excitation means 530 for applying the lateral vibration to the line array sound wave detector 520 is provided on one side of the line array sound wave detector 520.

In general, the weight of the line array sonar is about 50 ~ 70kg in 10m. Therefore, when the line array acoustic wave detector is suspended in the air without applying the tensile force as described above, the deflection occurs in the longitudinal direction. It is impossible to test correctly.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an apparatus for testing vibration characteristics of a line array sound wave detector which can more accurately test the vibration blocking characteristics in water.

1 is a block diagram schematically showing a general sound detector

2 is a vibration blocking land test apparatus of a conventional line array sound wave detector

3 and 4 show the structure of the first embodiment of the present invention.

3 is a front view of an apparatus for detecting vibration blocking characteristics of a line array sound wave detector;

4 is an enlarged view of a part of a line array sound wave detector vibration blocking characteristics test apparatus

FIG. 5 is a diagram showing the structure of a second embodiment of the present invention.

** Description of the symbols for the main parts of the drawings **

1: water tank 2: sound sensor

30: excitation part 31: excitation axis

32: excitation means 40: tension portion

41: tensile axis 42: reflected wave reducer

43: tension rope 44: tension applying means

50: excitation vibration measurement sensor 51: excitation axis force sensor

52: excitation axis accelerometer 60: tension portion vibration measurement sensor

61: tensile axis force sensor 62: tensile axis accelerometer

70: support structure 71: support rope

The present invention, in order to achieve the object described above, the water tank formed so as to contain water, the acoustic sensor stored in the tank, and installed on one side of the acoustic sensor, to apply a longitudinal vibration to the acoustic sensor It is provided on the opposite side of the excitation portion with the excitation portion, and the acoustic sensor, and provides a line array acoustic wave detector vibration blocking characteristics test device comprising a tension portion for applying a tensile force to the acoustic sensor.

On the other hand, the present invention is a support structure, several support ropes hanging down on the support structure, an acoustic sensor suspended in the air by the support rope, and installed on one side of the acoustic sensor, the length of the acoustic sensor It may be implemented to include a vibration unit for applying the directional vibration, and a tension unit provided in the opposite direction of the vibration unit with the acoustic sensor therebetween, to apply a tensile force to the acoustic sensor.

In addition, it is preferable to further comprise a tension part vibration measurement sensor unit provided in the tension unit for measuring the vibration of the tension side of the acoustic sensor.

In addition, it is preferable that the vibration further comprises a vibration measurement sensor unit provided in the vibration to measure the vibration of the vibration.

In addition, the excitation portion is preferably configured to include an excitation axis continuously installed on one side of the acoustic sensor, and an excitation means connected to the excitation axis to generate a vibration.

In addition, the tension portion is provided in the tension axis continuously installed in the acoustic sensor, the reflection wave reducer is formed on the end of the tension axis and made of a mass body, the tension rope is connected to the reflection wave reducer, and connected to the tension rope It is preferably configured to include a tension applying means capable of applying a tensile force.

In addition, the vibration part vibration measuring unit is configured to include an excitation shaft force sensor installed between the excitation shaft and the excitation means for measuring the force, and an excitation axis accelerometer installed on the excitation shaft to measure the acceleration It is preferable.

In addition, the tension unit vibration measurement sensor unit includes a tension axis force sensor installed between the tension axis and the reflected wave reducer to measure the force, and a tensile axis accelerometer installed on the reflected wave reducer to measure the acceleration It is preferred to be configured.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 and 4 are views showing the structure of the first embodiment of the present invention, Figure 3 is a front view of the line array acoustic wave detector vibration shielding characteristic test apparatus, Figure 4 is a line array acoustic wave detector vibration shielding characteristic test apparatus Some enlarged views.

FIG. 5 is a diagram showing the structure of the second embodiment of the present invention, which is a front view of the line array acoustic wave detector vibration shielding characteristic test apparatus.

As shown in Figure 3, the line array sound wave detector vibration blocking characteristics test apparatus of the present invention can fill the water, the upper portion is formed in a rectangular shape, when the long length of the front face has the shaft through hole on both sides And (11) and the tank (1) formed with a tension shaft through-hole (12); An acoustic sensor (2) stored in the tank (1) and installed therein; An excitation part 30 installed at one side of the water tank 1 to apply longitudinal vibration to the acoustic sensor 2; A tension unit 40 disposed in an opposite direction of the excitation unit 30 with the water tank 1 interposed therebetween to apply a tensile force to the acoustic sensor 2; An excitation vibration measurement sensor unit 50 installed on the excitation unit 30; It consists of a tension unit vibration measurement sensor unit 60 installed in the tension unit 40.

The excitation unit 30 is connected to one end of the acoustic sensor (2) and the excitation shaft 31 is installed through the excitation shaft through hole 11 of the side of the tank (1); It is configured to include an excitation means 32 connected to the excitation shaft 31 to generate a vibration. In addition, a cable outlet 33 is formed in the excitation shaft 31 so that the cable for transferring the signal generated by the acoustic sensor can be drawn out. The excitation means 32 may be composed of a hydraulic excitation or electromagnetism excitation.

The tension unit 40 is connected to the acoustic sensor 2 and installed through the tension shaft through hole 12 of the water tank 1, and the tension shaft 41 for applying a tensile force to the acoustic sensor 2. )and; A reflection wave reducing body 42 connected to the tensile axis 41; A tension rope 43 connected to the reflection wave reducing body 42; The tension rope 43 is composed of a tension applying means 44 provided.

The reflected wave reducer 42 serves as a point mass to reduce the error in numerical calculation by allowing a large force and a small acceleration to be measured. It is numerically advantageous to add as much point mass as possible, but if excessive lateral deflection occurs due to the point mass, other vibrations are caused and the error is rather large. According to the test, the reflection wave reducing body 42 preferably has a weight corresponding to 2 to 3 times the weight corresponding to the unit length (1 m) of the acoustic sensor 2.

Excitation vibration measurement sensor unit 50 is an excitation shaft force sensor (force transducer: 51) that is installed between the excitation shaft 32 and the excitation means (32) and the excitation shaft ( It is composed of an excitation axis accelerometer 52 which is installed in 32) to measure the acceleration.

The tension unit vibration measurement sensor unit 60 includes a tension axis force sensor 61 capable of measuring a force applied between the tension shaft 41 and the reflection wave reducing body 42 and the reflection wave reducing body ( 42 is configured as a tensile axis accelerometer 62 that can measure the acceleration.

As shown in FIG. 4, both sides of the water tank 1 are installed at the shaft through hole 11 and the tension shaft through hole 12 of the flange 13, and the flange 13 has the shaft 31 or the shaft to be tensioned. An oil ring 14 is provided at the inner circumference of the flange 13 to prevent water from flowing out of the water tank through the access hole when the 41 is moved in and out.

5 is a diagram showing the structure of a second embodiment of the present invention.

The line array sound wave detector vibration blocking characteristic test apparatus includes: a support structure (70) capable of hanging and supporting the acoustic sensor (2); Several support ropes 71 connected to the support structure 70; An acoustic sensor 2 suspended under the support rope 71; An excitation part 30 connected to one end of the acoustic sensor 2 to apply longitudinal vibration to the acoustic sensor 2; A tension unit 40 installed in an opposite direction of the excitation unit 30 with the acoustic sensor 2 interposed therebetween to apply a tensile force to the acoustic sensor 2; An excitation vibration measurement sensor unit 50 installed on the excitation unit 30; It consists of a tension unit vibration measurement sensor unit 60 installed in the tension unit 40.

The structure of the excitation part 30, the tension part 40, the vibration part vibration measurement sensor part 50, and the tension part vibration measurement sensor part 60 is the same as that of 1st Example.

The operation of the first embodiment of the present invention will be described below.

When the acoustic sensor 2 is actually used, the expected tensile force applied to the acoustic sensor 2 is set, and the expected tension force is applied to the tension rope 43 using the tension applying means 44. The tensile force is applied to the acoustic sensor 2 through the tension axis 41.

When the vibration means 32 applies the vibration, the vibration is measured by the vibration vibration measurement sensor unit 50, and the vibration is transmitted to the acoustic sensor 2 via the vibration shaft 31, the tensile shaft It is transmitted to the tension vibration measurement sensor unit 60 via 41, the tension vibration measurement sensor unit 60 measures the transmitted vibration.

In addition, the output of the acoustic sensor 2 can be measured using a cable connected through the cable outlet (33).

Accordingly, the vibration measured by the vibration part of the vibration measuring sensor unit 50 and the output of the acoustic sensor 2 measured in the cable connected via the cable outlet 33 and the vibration measured by the tension part vibration measuring sensor 60 By comparison, the line array sound wave detector vibration blocking characteristics can be known.

The operation of the second embodiment is the same as that of the first embodiment. However, in the second embodiment, while the acoustic sensor 2 is suspended from the support rope 71, the first embodiment is different in that it operates in water stored in the water tank 1.

As described above, the present invention can be more accurately know the vibration blocking characteristics of the line array sound wave detector by performing the experiment in the state where the tensile force is applied.

The present invention provides an apparatus for testing vibration characteristics of a line array sound wave detector that can more accurately test the vibration blocking characteristics in water on land.

Claims (10)

A water tank formed to hold water; An acoustic sensor stored in the tank; An excitation unit installed at one side of the acoustic sensor to apply vibration in the longitudinal direction to the acoustic sensor; A tension unit disposed on the opposite side of the excitation unit with the acoustic sensor interposed therebetween, the tension unit applying a tensile force to the acoustic sensor; Line array sound wave detector vibration shielding characteristics testing device comprising a. A support structure; Several support ropes suspended below the support structure; An acoustic sensor suspended in the air by the support rope; An excitation unit installed at one side of the acoustic sensor to apply longitudinal vibration to the acoustic sensor; A tension unit disposed opposite the excitation unit with the acoustic sensor interposed therebetween to apply a tensile force to the acoustic sensor; Line array sound wave detector vibration shielding characteristics testing device comprising a. The method according to claim 1 or 2, And a tension unit vibration measurement sensor unit installed in the tension unit to measure the vibration of the tension unit side of the acoustic sensor. The method according to claim 1 or 2, And an excitation unit vibration measuring sensor unit installed in the excitation unit to measure the excitation vibration of the excitation unit. The method of claim 1 or 2, wherein the excitation portion An excitation shaft continuously installed at one side of the acoustic sensor; Excitation means connected to the excitation shaft to generate vibration; Line array sound wave detector vibration shielding characteristics testing device comprising a. The method of claim 4, wherein the excitation portion An excitation shaft continuously installed at one side of the acoustic sensor; Excitation means connected to the excitation shaft to generate vibration; Line array sound wave detector vibration shielding characteristics testing device comprising a. The method of claim 1, wherein the tension portion A tension shaft provided continuously to the acoustic sensor; A reflection wave reducing body installed at an end of the tensile shaft and formed of a mass; A tension rope connected to the reflection wave reducing body; And a tension applying means connected to the tension rope to apply a desired tensile force. The method of claim 3, wherein the tension portion A tension shaft installed continuously on the other side of the acoustic sensor; A reflection wave reducing body installed at an end of the tensile shaft and formed of a mass; A tension rope connected to the reflection wave reducing body; And a tension applying means connected to the tension rope to apply a desired tensile force. The vibration measuring sensor unit of claim 6, wherein An excitation shaft force sensor installed between the excitation shaft and the excitation means for measuring a force; An excitation axis accelerometer installed on the excitation axis and capable of measuring acceleration; Line array sound wave detector vibration shielding characteristics testing device comprising a. According to claim 8, wherein the tension portion vibration measuring sensor unit A tension axis force sensor installed between the tension axis and the reflected wave reducer to measure force; A tensile axis accelerometer installed in the reflected wave reducer to measure acceleration; Line array sound wave detector vibration shielding characteristics testing device comprising a.