JP6743516B2 - Diaphragm measuring device - Google Patents

Description

The present invention relates to a diaphragm measuring device that measures the position or vibration of a diaphragm.

An example of a low-frequency sound source device that vibrates a diaphragm to emit low-frequency sound is an underwater sound source device. The underwater sound source device vibrates a diaphragm in water such as the ocean, lakes and rivers, emits low-frequency sound, and observes sound propagation in water.

In the underwater sound source device, it is necessary to measure the vibration of the diaphragm in advance or periodically and adjust the vibration state so that a desired sound wave can be obtained.

The underwater sound source device connects a hydraulic cylinder to the diaphragm, drives the hydraulic cylinder, and forcibly vibrates the diaphragm to generate low-frequency sound. Conventionally, when measuring the vibration of the diaphragm, the vibration state of the diaphragm has been measured based on the detection values of a displacement sensor and an acceleration sensor provided in advance on the hydraulic cylinder. Further, the detection results of the displacement sensor and the acceleration sensor are displayed in a control room or the like which is located away from the underwater sound source device.

Note that in Patent Document 1, the vibration in the x direction and the y direction is measured based on the images of the measurement target region sequentially acquired by the imaging unit, and the measurement target measured in time series by the laser range finder. A vibration measuring device and a measuring method for measuring the vibration in the z direction based on the distance to the region and measuring the three-dimensional vibration of the edge portion in the measurement target region are disclosed.

JP 2005-283440 A

However, the higher the vibration of the diaphragm, the smaller the amplitude and the shorter the wavelength, so the amount of change in the hydraulic cylinder becomes smaller. Therefore, in the displacement sensor and the acceleration sensor, the accuracy of vibration detection is lowered, and noise generated in the detection value is increased because the sensor itself vibrates.

Further, in the conventional case, the detection result of the acceleration sensor or the like is displayed in a control room or the like which is separate from the underwater sound source device, and it is necessary to move back and forth between the underwater sound source device and the control room during adjustment. However, the adjustment efficiency was poor.

The present invention provides a diaphragm measuring device capable of contactlessly measuring the position and vibration of a diaphragm regardless of the amplitude of vibration and the length of wavelength.

The present invention is a diaphragm measuring device for measuring vibration of a diaphragm, comprising a frame portion extending in the vertical direction, and extending from the upper end portion and the lower end portion of the frame portion toward the diaphragm, An engaging portion engageable with a frame portion provided around the diaphragm, a pedestal attached to the frame portion in a direction orthogonal to the frame portion, and a pedestal facing the diaphragm on the pedestal. The present invention relates to a diaphragm measuring device, which is provided with a distance meter that irradiates a measuring medium and receives the measuring medium reflected from the diaphragm to measure a distance.

The present invention also provides a diaphragm measurement method, wherein the rangefinder continuously measures the displacement of the diaphragm, and a control device for measuring the vibration of the diaphragm based on the displacement of the diaphragm measured by the rangefinder. It relates to the device.

Also, in the present invention, the engagement portion includes an upper engagement portion provided at an upper end portion of the frame portion and a lower engagement portion provided at a lower end portion of the frame portion. And one of the lower engaging portions engages with the frame portion at two points and the other engages at one point.

Further, according to the present invention, a sliding portion is provided on the pedestal so as to be slidable toward and away from the diaphragm, and the hinge is rotatable in two directions with two axes in which the distance meter is orthogonal to the sliding portion. The present invention relates to a diaphragm measuring device attached via a section.

Further, according to the present invention, the frame part has an opening, the pedestal is rotatably provided with respect to the frame part, and the pedestal is accommodated in the opening by the rotation of the pedestal. The present invention relates to a plate measuring device.

Further, the present invention relates to a diaphragm measuring device configured such that one of the upper engaging portion and the lower engaging portion is expandable/contractible and holds the frame portion, and the other is in contact with the frame portion. ..

The present invention also relates to a diaphragm measuring device, wherein the distance meter is detachably attached to the hinge portion.

Furthermore, the present invention relates to a diaphragm measuring device in which the distance meter is a laser distance meter.

According to the present invention, there is provided a diaphragm measuring device for measuring the vibration of a diaphragm, wherein the frame part extends in the vertical direction, and extends from the upper end part and the lower end part of the frame part toward the diaphragm, respectively. An engaging portion engageable with a frame portion provided around the diaphragm, a pedestal attached to the frame portion in a direction orthogonal to the frame portion, and the diaphragm on the pedestal Since it is provided with a distance meter that is provided facing each other and irradiates the measurement medium and receives the measurement medium reflected from the diaphragm to measure the distance, high accuracy is achieved regardless of the amplitude or wavelength of the diaphragm. Moreover, it is possible to measure the distance to the diaphragm, suppress the noise generated in the diaphragm, and improve the measurement accuracy.

It is a perspective view showing the state where a diaphragm measuring device was attached to an underwater sound source device. It is a perspective view of a diaphragm measuring device showing a state in which a pedestal is opened. It is a rear perspective view of the diaphragm measuring device showing a state in which the pedestal is opened. It is a perspective view of a diaphragm measuring device showing a state where a pedestal is stored.

Embodiments of the present invention will be described below with reference to the drawings.

First, referring to FIGS. 1 to 4, a diaphragm measuring device according to an embodiment of the present invention will be described.

FIG. 1 shows a case where the diaphragm measuring device 1 is applied to an underwater sound source device 2 as a low frequency sound source device.

The underwater sound source device 2 includes a hollow cylindrical enclosure 3 having both open ends, a diaphragm 4 (only one of which is shown in FIG. 1) closing both openings of the enclosure 3, and the underwater sound source device 2. 2 has a frame portion 5 for supporting 2. The frame portion 5 is made of a pipe material, and is configured to support the underwater sound source device 2 and protect the underwater sound source device 2 from obstacles.

A hydraulic cylinder (not shown) is provided inside the enclosure 3, and the vibrating plate 4 is vibrated with a predetermined amplitude and a predetermined acceleration by the hydraulic cylinder.

The diaphragm measuring device 1 is provided so as to extend vertically on the frame portion 5 so as to face the diaphragm 4. The diaphragm measuring device 1 extends in the vertical direction and has a flat frame portion 7 made of, for example, aluminum. The frame 7 has a rectangular opening 8 which is long in the vertical direction, and a side end face of the frame 7 is provided with a handle 10 extending in the vertical direction.

At the upper end of the frame part 7, first engaging parts 6 extending from the left and right side parts toward the vibrating plate 4, respectively, and the first engaging parts 6 are positioned below the first engaging parts 6. A second engaging portion 11 that faces the engaging portion 6 is provided. The first engaging portion 6 and the second engaging portion 11 constitute an upper engaging portion.

The first engagement portion 6 has a pair of left and right first engagement pieces 9 and 9 fixedly provided on the upper end of the frame portion 7. The first engagement pieces 9 and 9 have the frame. Semicircular recesses 12, 12 that can be fitted to the portion 5 are formed. The left and right ends of the second engaging portion 11 are slidably fitted to the frame portion 7 and are provided so as to be vertically displaceable. The second engagement portion 11 has second engagement pieces 13 and 13 extending from the left and right ends toward the diaphragm 4, respectively. Semicircular recesses 14 and 14 that can be fitted to the frame portion 5 are formed at positions corresponding to the recesses 12 and 12 on the upper surfaces of the second engaging pieces 13 and 13.

A handle portion 15 serving as a displacing means is provided between the first engagement pieces 9, 9 at the upper end of the frame portion 7. The handle portion 15 has a screw 16 protruding downward, and the screw 16 is screwed into the second engaging portion 11. The screw 16 is rotated by the rotation of the handle portion 15, the second engaging portion 11 is displaced in the vertical direction, and the second engaging pieces 13 and 13 are moved relative to the first engaging pieces 9 and 9. It is designed to approach and separate from each other. That is, the first engaging pieces 9, 9 and the second engaging pieces 13, 13 are expanded and contracted by the operation of the handle portion 15 so that they can be engaged with and disengaged from the frame portion 5.

A third engaging portion 17 which is a lower engaging portion extending toward the diaphragm 4 is provided at a lower end portion of the frame portion 7. The third engaging portion 17 is located at the center or substantially the center in the left-right direction with respect to the frame portion 7, and is composed of a plate piece. The lower surface of the third engaging portion 17 is formed with a semicircular recess 18 that can be fitted into the frame portion 5. The recesses 12, 14, 18 provided in the first engaging portion 6, the second engaging portion 11, and the third engaging portion 17 are formed so as to correspond to the shape of the underwater sound source device 2. , But is not limited to a semi-circular shape.

The first engaging portion 6, the second engaging portion 11, and the third engaging portion 17 constitute an engaging portion for attaching the diaphragm measuring device 1 to the frame portion 5. Further, the engaging portion and the frame portion 7 constitute an attachment for attaching the measuring portion.

A rectangular pedestal 19 is provided in the opening 8, and the pedestal 19 has a shape that can be stored in the opening 8. The pedestal 19 is attached to the frame 7 via a shaft 21. There is. The pedestal 19 is rotatable about the shaft 21, and is biased clockwise by its own weight in FIG. 2, for example.

The base of the pedestal 19 is provided with detent pieces 22, 22 that are wider than the pedestal 19 and project in a direction orthogonal to the pedestal 19. Clampers 24, 24 (see FIG. 2) are provided at the tips of the rotation stopping pieces 22, 22 so as to project in a direction parallel to the pedestal 19. By fitting the clamper parts 24, 24 into a clamper receiver (not shown) provided on the frame part 7, the position of the pedestal 19 in a horizontal state is fixed. The clampers 24, 24 can be fitted and removed with a predetermined force.

When the clamper portions 24, 24 contact the frame portion 7, the pedestal 19 is supported in a state of being orthogonal or substantially orthogonal to the frame portion 7. Adjustment screws 25, 25 are provided on the frame portion 7 at positions facing the rotation stopping pieces 22, 22. Fine adjustment of the fixing position of the pedestal 19 is possible by adjusting the protrusion amount of the adjusting screws 25, 25 with the adjusting screws 25, 25 abutting against the rotation stopping pieces 22, 22. There is.

On the back surface of the tip of the pedestal 19 (see FIG. 2), a rotation stop plate 26 having a width wider than that of the pedestal 19 is provided. When the pedestal 19 is rotated counterclockwise in FIG. 2, the rotation stopping plate 26 comes into contact with the frame portion 7. When the rotation stopper plate 26 abuts on the frame portion 7, the pedestal 19 is housed in the opening 8 and is parallel or substantially parallel to the frame portion 7.

Further, a fixing screw 27 projecting toward the center of the opening 8 is screwed into the frame 7. With the rotation stopper plate 26 in contact with the frame portion 7, the fixing screw 27 is rotated and the tip end is pressed against the pedestal 19, so that the pedestal 19 is stored in the opening 8. It is supposed to be fixed.

A guide groove 28 (see FIG. 2) parallel to the longitudinal direction of the pedestal 19 is formed in the pedestal 19, and a long hole 28a parallel to the guide groove 28 is formed at the center of the guide groove 28. ing. A sliding portion 29 is slidably provided in the guide groove 28. A knurled screw 30 for fixing is screwed into the sliding portion 29 through the elongated hole 28a. Therefore, by loosening the knurled screw 30, the sliding portion 29 can slide along the guide groove 28. That is, the diaphragm 4 can be slid in the approaching and separating directions. Further, by tightening the knurled screw 30, the sliding portion 29 can be fixed at an arbitrary position in the guide groove 28.

A hinge portion 31 extending toward the diaphragm 4 is fixed to the sliding portion 29. The hinge portion 31 has two orthogonal rotation axes, and is rotatable in two orthogonal directions of the vertical direction and the horizontal direction. A distance meter 32 is detachably attached to a flange 31a provided at the tip of the hinge portion 31. The distance meter 32 is a non-contact distance meter that measures the distance to the object to be measured by irradiating the object to be measured with the measuring medium and receiving the measuring medium reflected by the object to be measured. The range finder 32 is, for example, a laser range finder or an ultrasonic range finder. In this embodiment, a laser rangefinder using light as a measuring medium is used.

The position of the distance meter 32 can be adjusted with respect to the vibrating plate 4 in the approaching/separating direction, the vertical rotation direction, and the horizontal rotation direction.

The distance meter 32 is connected to a control device 33 (see FIG. 2) such as a PC, and the measurement result of the distance meter 32 is input to the control device 33. A display unit 34 (see FIG. 2) such as a monitor is connected to the control device 33, and the measurement result of the distance meter 32 and the like are displayed on the display unit 34. The control device 33 and the display unit 34 are provided close to the distance meter 32.

Further, the control device 33 has a storage unit 35 (see FIG. 2) such as a semiconductor memory or an HDD. In the storage unit 35, a control program for driving the distance meter 32 and controlling the measurement interval, and the amplitude and frequency of the diaphragm 4 from the displacement of the distance to the diaphragm 4 measured by the distance meter 32. A calculation program for calculation and a program such as a display program for displaying the calculation result on the display unit 34 are stored, and data such as measurement results and calculation results are also stored.

Next, attachment of the diaphragm measuring device 1 to the underwater sound source device 2 and measurement of the diaphragm 4 by the diaphragm measuring device 1 will be described. Although the diaphragm measuring device 1 is provided for each of the two diaphragms 4, the case where the diaphragm measuring device 1 is provided for one of the diaphragms 4 will be described below.

When the diaphragm measuring device 1 is attached to the underwater sound source device 2, first, the handle portion 15 is rotated to displace the second engaging portion 11 downward. The concave portion 18 of the third engaging portion 17 and the frame portion 5 are fitted to each other, and the frame portion 5 is passed between the first engaging pieces 9, 9 and the second engaging pieces 13, 13. The recesses 12, 12 of the first engagement pieces 9, 9 are fitted to the frame portion 5.

Next, the handle portion 15 is rotated in the opposite direction to displace the second engaging portion 11 upward, and the frame portion 5 is fitted between the concave portions 12 and 12 and the concave portions 14 and 14. .. At this time, the diaphragm measuring device 1 is supported by the frame portion 5 at three points of the first engaging portion 6, the second engaging portion 11 and the third engaging portion 17, and the frame portion 5 is The first engaging pieces 9 and 9 are held by the second engaging pieces 13 and 13.

When the diaphragm measuring device 1 is attached to the frame portion 5, the distance meter 32 is placed in a horizontal posture, the hinge portion 31 is fixed, and the diaphragm 4 is directly faced. The leveling of the distance meter 32 is carried out based on a horizontal detecting means such as a bubble tube which the distance meter 32 itself has. The position of the distance meter 32 is preferably set such that the optical axis of the distance meter 32 is at the center or substantially the center of the diaphragm 4.

Finally, the sliding portion 29 is slid to adjust the distance between the diaphragm 4 and the distance meter 32, and the knurled screw 30 is locked to lock the underwater sound source device of the diaphragm measuring device 1. Installation to 2 is completed.

After the installation of the diaphragm measuring device 1 is completed, the diaphragm 4 is vibrated with a predetermined output by a hydraulic cylinder (not shown). The control device 33 causes the distance meter 32 to measure the acquisition time in which the distance to the diaphragm 4 is set continuously at a predetermined time interval, for example, a sampling cycle corresponding to the operation cycle.

The measurement result of the distance meter 32 is sequentially input to the control device 33, stored in the storage unit 35 in association with the acquisition time.

The control device 33 calculates the velocity and acceleration of the diaphragm 4 and the amplitude and frequency based on the distance to the diaphragm 4 in time series, that is, the displacement between the diaphragms 4. Thereby, the vibration of the diaphragm 4 with respect to the distance meter 32 (displacement in the approaching/separating direction) is acquired as waveform data, and the vibration state of the diaphragm 4 is measured.

At this time, data such as speed, acceleration, amplitude, and frequency of the diaphragm 4 calculated by the control device 33 and waveform data are displayed on the display unit 34, so that the operator can see the vibration state of the diaphragm 4. You can check it.

Based on the data displayed on the display unit 34, the operator determines whether the diaphragm 4 obtains a desired vibration, that is, whether the underwater sound source device 2 emits a desired low frequency sound. If it is determined that the desired low frequency sound is not obtained, the drive state of the hydraulic cylinder (not shown) is adjusted, and the vibration state of the diaphragm 4 is adjusted.

It should be noted that the relationship between the drive state of the hydraulic cylinder (not shown), the vibration state of the diaphragm 4, and the low-frequency sound emitted from the underwater sound source device 2 may be stored in the storage unit 35 in advance as a database. Good. In this case, the control device 33 compares the vibration state of the diaphragm 4 obtained by measurement with the database, and displays on the display unit 34 whether or not a desired vibration is obtained. Good.

As described above, in the present embodiment, the vibration of the diaphragm 4 is measured in a non-contact manner by the diaphragm measuring device 1 attached to the frame portion 5 which is a non-vibrating portion. The vibration of the vibrating plate 4, which is the vibrating portion, can be measured without vibrating the measuring device 1 itself.

Therefore, the vibration of the diaphragm 4 can be measured with high accuracy regardless of the amplitude of the vibration and the length of the wavelength, and whether or not a desired sound wave can be obtained can be measured. In addition, it is possible to suppress the generation of noise in the measurement result, and improve the measurement accuracy.

Further, the diaphragm measuring device 1 is attached to the frame portion 5 supporting the underwater sound source device 2, and data such as velocity, acceleration, amplitude, frequency, etc. and waveform data calculated based on the measurement result of the distance meter 32. Is displayed on the display unit 34 provided adjacent to the diaphragm measuring device 1.

Therefore, the vibration state of the diaphragm 4 can be confirmed on the spot. Further, since the diaphragm 4 and the diaphragm measuring device 1 are in a separated state, and the underwater sound source device 2 can be independently adjusted, there is a restriction on the diaphragm measuring device 1 side. Therefore, the vibration state of the diaphragm 4 can be easily adjusted.

Further, the diaphragm measuring device 1 is configured to be supported by the frame portion 5 at three points of the first engaging portion 6, the second engaging portion 11 and the third engaging portion 17. Therefore, a portion where the frame portion 5 is fitted to the first engaging pieces 9 and 9 and the second engaging piece 13 and 13 is fitted to the frame portion 5 and the third engaging portion 17. Even if the portion to be made is not parallel, that is, if one is inclined, the diaphragm measuring device 1 can be stably supported. The first engaging portion 6 may be supported at one point and the third engaging portion 17 may be supported at two points.

Further, the pedestal 19 is rotatable via the shaft 21, the pedestal 19 can be stored in the opening 8, and the distance meter 32 can be attached and detached. It can be easily transported.

In the present embodiment, the range finder 32 (laser range finder) is used as the range finder for measuring the distance to the diaphragm 4, but other range finder such as an ultrasonic range finder may be used. Good. Since the wavelength of the ultrasonic wave used in the ultrasonic range finder is significantly different from the wavelength of the vibration of the vibration plate 4, the influence of the interference between the sound waves is small, and the vibration of the vibration plate 4 can be accurately measured. it can.

Further, since the distance meter 32 is removable, it can be easily replaced with an appropriate distance meter according to the distance to the diaphragm 4 and the vibration state.

Further, in the present embodiment, the handle portion 15 is rotated to displace the second engaging portion 11 in the vertical direction, but the first engaging portion 6 and the third engaging portion 17 are also vertically moved. It may be displaceable in any direction. As a result, the diaphragm measuring device 1 of this embodiment can be applied to other low frequency sound source devices or the like having different sizes of the frame portion 5, and the versatility of the diaphragm measuring device 1 can be improved. .. Further, in the present embodiment, the diaphragm measuring device 1 is attached to the frame portion 5, but it may be at another position as long as it can measure the vibrating portion in a non-contact manner.

Further, in this embodiment, the pedestal 19 is rotatable via the shaft 21 fixedly provided, but the shaft 21 may be vertically displaceable. By displacing the shaft 21 in the vertical direction, the pedestal 19 is displaced in the vertical direction, and it becomes possible to adjust the optical axis of the range finder 32 in the vertical direction. Therefore, the versatility of the diaphragm measuring device 1 is improved. Can be increased.

Further, in this embodiment, the vibration of the diaphragm 4 is measured based on the displacement of the diaphragm 4 for each time series. However, when the distance to the measurement object is measured and the vibration is not measured, The control device 33 can be omitted.

DESCRIPTION OF SYMBOLS 1 Vibrating plate measuring device 2 Underwater sound source device 4 Vibrating plate 5 Frame part 7 Frame part 6 First engaging part 11 Second engaging part 17 Third engaging part 19 Pedestal 22 Rotation stop piece 26 Rotation stop plate 28 Guide groove 29 Sliding part 32 Distance meter 33 Control device 34 Display part 35 Storage part

Claims (8)

A vibrating plate measuring device for measuring vibration of a vibrating plate, comprising: a frame part extending in a vertical direction; and a frame part extending from the upper end part and the lower end part of the frame part toward the vibrating plate. An engaging portion engageable with a frame portion provided on the base portion, a pedestal attached to the frame portion in a direction orthogonal to the frame portion, and provided on the pedestal so as to face the diaphragm. A vibrating plate measuring device, comprising: a distance meter that irradiates a measuring medium and receives the measuring medium reflected from the vibrating plate to measure a distance. The diaphragm according to claim 1, wherein the distance meter has a control device that continuously measures the displacement of the diaphragm and measures the vibration of the diaphragm based on the displacement of the diaphragm measured by the distance meter. measuring device. The engaging portion includes an upper engaging portion provided at an upper end portion of the frame portion and a lower engaging portion provided at a lower end portion of the frame portion, and the upper engaging portion and the lower engaging portion. The diaphragm measuring device according to claim 1 or 2, wherein one of the portions is engaged with the frame portion at two points and the other is engaged at one point. A sliding portion is provided on the pedestal so as to be slidable toward and away from the vibrating plate, and is attached to the sliding portion via a hinge portion that is rotatable in two directions with two axes orthogonal to the distance meter. The diaphragm measuring device according to any one of claims 1 to 3. The frame part has an opening, the pedestal is rotatably provided with respect to the frame part, and the pedestal is configured to be housed in the opening by rotation of the pedestal. 4. The diaphragm measuring device according to any one of 4. The diaphragm measuring device according to claim 3, wherein one of the upper engaging portion and the lower engaging portion is configured to be expandable/contractible so as to hold the frame portion, and the other abuts on the frame portion. The diaphragm measuring device according to claim 4, wherein the range finder is detachably attached to the hinge portion. The diaphragm measuring device according to claim 1, wherein the range finder is a laser range finder.

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