Plant for calibrating linear hydroacoustic antennae

FIELD: hydroacoustics.

SUBSTANCE: device has hydro-chamber, emitters, hydro-phones and device for tugging and holding calibrated antenna inside hydro-chamber. Emitters and hydro-phones are mounted in hydro-chamber walls oppositely to one another. Hydro-chamber and device for tugging and holding antenna are made in form of separate sections, engaged with one another as a whole unit, and calibrated antenna is electrically and mechanically disconnected from system for reproducing and controlling parameters of hydro-acoustic field (emitters and hydro-phones). Additionally plant has set-point generator, used for generation of signals for emitters.

EFFECT: higher precision, higher efficiency.

8 cl, 6 dwg

 

The invention relates to the field of hydro-acoustics and can be used for calibration and verification of linear acoustic antennas in the laboratory.

Known installation (In accordance with RIS 29-99 "GSE. Metrology. Basic terms and definitions. "The term "installation" is a short form of the term "measurement setup", which is defined as "a set of functionally integrated measures, measuring instruments, measuring transducers and other devices designed for measuring one or more physical quantities and located in one place.") the same destination [1], adopted for the prototype, containing a closed gidrotamir filled with the working fluid and is made with the ability to work at elevated hydrostatic pressure, the emitters and N hydrophones, which are located inside hydrochory, the device pullback and consolidation of the calibrated antenna inside hydrochory, including the guide and the holders of the antenna, computer, multi-channel digital path emitters, including digital to analog converters, multichannel digital channel hydrophones, including analog-to-digital converters, digital channel measured antenna comprising an analog-to-digital Converter, and the input emitters connected to the outputs of the multichannel digital is a new tract of emitters, the outputs of the hydrophones are connected to the inputs of multi-channel digital channel hydrophones, the antenna output is connected to the digital input channel of the measured antenna and all digital paths and the channel is connected to the computer.

The disadvantage of the prototype is the difficulty of installation maintenance associated with difficulties securing emitters, hydrophones and calibrated antenna inside hydrochory, especially when using large length of hydroclear, the need for which arises during calibration of extended antennas, sometimes reaching several tens of meters in length.

Rail haul and fastening of the calibrated antenna in the prototype is the framework on which by means of holders mounted transducers, hydrophones and antenna. And all this design, as a whole, then located in hydroxamate. All cable glands from emitters, hydrophones and antenna go through a single connector, made in the side wall of hydrochory.

When the failure in the prototype of at least one of the emitter or of the hydrophone is necessary to dismantle the entire device pullback and consolidation of the calibrated antenna: fully remove it from hydrochory with emitters, hydrophones and the antenna. After replacement of the failed item have to laboriously p is the placement of haul and fixing inside hydrochory.

To this must be added the difficulties of mounting a monolithic hydrochory at its standard location and complexity for completing hydrochory working liquid, and then removing the working fluid from hydrochory. This should take into account the complexity of the removal of hydrochory air bubble that is formed by filling a sealed hydrochory working fluid. The presence of air in hydroxamate when calibrating the antenna can lead to large measurement errors.

The input and output of electric signals in gidrotamir and out through one contains a thermal connector in protophyte leads to surges of high voltage signals applied to the emitters, the output signals of the hydrophones and the antenna, which in turn leads to measurement errors.

The technical result from implementation of the invention is to eliminate the disadvantages of the prototype, i.e. the improvement of the operational capabilities of the installation in the first place, when calibrating the long antennas due to the junction of the emitters, hydrophones and antennas from each other, simplifying the process of pulling and fastening hydroacoustic antenna inside hydrochory. And by simplifying the Assembly process and installation hydrochory on standard location and removal processes of the air bubble and the subsequent draining the working fluid from hydrochory. In addition to this the th, by passing electrical cables going to the emitters and from hydrophones and from the antenna, reduced crosstalk signals to each other, and therefore, improves the accuracy of the measurements.

Delivered technical result is reached due to the fact that in the known installation comprising a closed gidrotamir filled with the working fluid and is made with the ability to work at elevated hydrostatic pressure, the emitters and N hydrophones inside hydrochory, the device pullback and consolidation of the calibrated antenna inside hydrochory, including the guide and the holders of the antenna, computer, multi-channel digital path emitters, including digital to analog converters, multichannel digital channel hydrophones, including analog-to-digital converters, digital channel measured antenna comprising an analog-to-digital Converter, and the input emitters connected to the outputs of multi-channel digital channel emitters, outputs the hydrophones are connected to the inputs of multi-channel digital channel hydrophones, the antenna output is connected to the digital input channel of the measured antenna and all digital paths and the channel is connected to the computer, the guide device pullback and consolidation of the calibrated antenna attached to the wall of hydrochory, and the holders of the antennas is, configured to move together with the antenna inside hydrochory guide, hydroclear and guide device pullback and consolidation of the calibrated antenna is made of separate sections joined together in a single entity, section hydrochory fit tightly, hydroclear is located relative to the horizon with a longitudinal gradient in the lower part of hydrochory mounted crane, and at the top of the air valve, the transducers and hydrophones inserted into the same intermediate casing, hermetically installed transducers and hydrophones in the case of hydrochory with its outer side, while the transformative elements of the transducers and hydrophones are located inside hydrochory and connectors transducers and hydrophones for connecting electrical signals outside hydrochory.

In the particular case of section hydrochory are located on the same trucks that are installed on the track.

In the particular case of the intermediate casing with hydrophones placed opposite the intermediate buildings with radiators.

In the particular case of the section of the guide device pullback and consolidation of the calibrated antenna mounted in two clamps attached to the wall section hydrochory, when this section of the guide is configured to move in these clips.

In frequent the om case, the installation further comprises a master oscillator, the output of which is connected to the control inputs of digital to analog converters digital multichannel tract emitters, and managed entry into the computer.

In the particular case of the second output driving generator is additionally connected to the control inputs of the analog-to-digital converters multi-channel digital channel hydrophones and digital channel calibrated antenna.

In the particular case of multi-channel digital channel hydrophones made in the form of analog-to-digital Converter and the switch analog signals having N inputs connected to the outputs of the hydrophones, and one output connected to the input of analog-to-digital Converter.

In the particular case described in the previous paragraph, the second output of the master oscillator is connected to the control inputs of the analog-to-digital Converter and the switch analog signals of multi-channel digital channel hydrophones.

The invention is illustrated in the drawing, in which figure 1 presents the General scheme of the installation; figure 2 - General scheme of hydrochory; figure 3 - fixing the transducers and hydrophones in the wall of hydrochory; figs.4, 5 - longitudinal and cross-sectional haul and fastening of the calibrated antenna; figure 6 is a photograph of a General view of the installation.

Setup for calibration of linear acoustic antennas which contains a closed gidrotamir 1 (1), filled with the working liquid 2, mainly water, and executed with the ability to work at high pressure pumping station (Fig. not shown).

Hydroclear 1 is made of individual sections 11,..., 1to(2)hermetically joined to each other.

Each section 11,...,1tohydrochory 1 is located on trucks 31,...,3toinstalled on the track 4, which has a relatively horizon small longitudinal slope. The angle of slope of the track α.

Hydroclear 1 is airtight, with the possibility of filling the working fluid. In the bottom of the last 1tosection hydrochory 1 (α>0 is the lowest point of the entire hydrochory 1) has a valve 5 for water drainage, and the top of the first 11section hydrochory 1 (α>0 is the upper point of the whole hydrochory 1) air valve 6.

Each i-th section hydrochory 1 provided at the ends of the same coupling nuts 7iand 8ithat screw on the appropriate thread on the ends of the section 1i. Nut adjacent sections are connected together by bolts and nuts (Fig. not shown), and is docked to each other and simultaneously aligning, i.e. the position of the single hydrochory relative to the rail track sections hydrochory. To cap the guy who am outside sections of the same studs and nuts are used to fasten the flanges 9 and 10, closing gidrotamir 1 the ends. Sealing joints of hydrochory with each other and outside sections with flanges 9, 10 by using rubber o-rings (Fig. not shown).

Hydroclear equipped with a pressure gauge (Fig. not shown) for measuring it hydrostatic pressure.

In the side walls 11 sections hydrochory 1i,..., 1to, (1) set M emitters 121,..., 12mand N hydrophones 131,..., 13N. In the particular case M=N, transducers and hydrophones are installed opposite each other and are made identical in form.

To each emitter 12 and the hydrophone 13 is connected to their electrical cables. Each emitter 12 or hydrophone 13 is fixed in the side wall 11 with its outer side (figure 3). For this purpose in the side wall 11 execute a series of holes 14, the diameter of which allows you to set the emitters 12 or hydrophones 13. While the emitters 12 or hydrophones 13 are mounted in the intermediate housing 15, which in turn are inserted into the holes 14 and are fastened to the housing 11 by four studs with nuts 16. Sealing the cavity between the housing hydrochory 11 and the intermediate housing 15 by using a rubber o ring 17. Sealing the cavity between the intermediate casing 15 and the emitter 12 (or hydrophone 13) the implementation of which is using a rubber o ring 18.

In this fixing of Converter elements emitters hydrophones 12 and 13 are within hydrochory 1 opposite each other, and their connectors 19 - on the outside of hydrochory.

Such arrangement of the emitters 12 and hydrophones 13 allows you to simplify cable management and operations replacement of individual converters. In addition, with this arrangement of transducers and hydrophones get less noise on the output signal of the test antenna, which are excreted by the contains a thermal connector to the end flange 10 hydrochory.

Guide 20 (figure 4, 5) haul and fastening of the calibrated antenna made in the form of a hollow tube with a longitudinal slit at the bottom. It is fastened in the clamps 21 (figure 5) can move in them. Themselves clamps rigidly fixed to the upper part of the body hydrochory 11. In each section of hydrochory there are 2 clamps. Guide as well as hydroclear, is sectional. The guide section is a segment of a hollow tube with a longitudinal slit at the bottom. One end of this segment, the hollow tube has the form of a truncated cone, the other kind of the opposite of a truncated cone. When the coupling section of the guide cone into each other, and the stacked section of the guide take the form of a single pipe.

The holder of the antenna device pullback and consolidation calibrate the antenna is made in the form of a set of shoes 22, moving inside the guide 20. Each Shoe 22 goes down the axis 23, which extends from the guide 20 through an incision at the bottom. For each axis 23 attached to its holder 24, which represents a rod, bent in an arc of a circle with a spring 25. The calibrated antenna 26 rests on the curved rods 24 and fixed by the spring 25. The sizes of these elements haul such that the center of the arc which is curved rod holder 24, falls on the center of hydrochory 1, where the acoustic field is modeled in the best way. In each Shoe 22 on both ends includes a rigid tube 27, attached to each other and to Shoe the U-shaped bracket 28. Thanks to the rigidity of the tubes 27 all holders of the antenna (the shoes 22) are able to move inside the guide when applying force to the extreme handset. The length of the tube 27, and hence the number of shoes determines the stiffness of the calibrated antenna 26 so that the distance between the holders 24, equal to the length of the tube 27, the antenna 26 had no vertical deflection.

Electronic equipment installation includes (figure 1): multi-channel digital path emitters (MCTI) 29, a digital channel to be calibrated antenna (CCCA) 30, multichannel digital channel hydrophones (MCTG) 31, a master oscillator (MO) 32 and a computer 33.

The wiring of the electronic components is presented in figure 1. Thin arrows here presents a galvanic connection of the emitters 12 of MCTI 29, hydrophones 13 MCTG 31, calibrated antenna 26 with CCCA 30 for transmission of analog signals. Wide gray arrows communication for transmission of clock signals from ZG 32 to the digital-to-analogue converters (DACS) and analog-to-digital Converter (ADC) units 29-31, wide white arrows indicate the communication transmitting digital codes between the computer 33 and blocks 29-32.

MCTI 29 contains M DAC outputs are connected to the inputs of the emitters 12. MCTI 29 may contain M-channel signal amplifier DAC, the task will be the coordination of the DAC used in MCTI, and amplification of the output signals from the DAC to the required levels. Each of the DAC generates a sinusoidal signal with their amplitudes and phases, which are calculated by the program of the computer 33. Digital code values of amplitudes and phases for each DAC are transmitted from the computer 33 to MCTI 29. To ensure hardware equality of all output frequencies of sinusoidal signals generated by the DAC, the unit is incorporated ZG 32, which generates a clock signal supplied to the controlled input of all the DAC, resulting in their simultaneous operation. The frequency of the clock signal to programmatically set the computer 33 and the digital code is transmitted in ZG 32.

CCCA 30 will win ADC, digitizing the output signal of the calibrated antenna. CCCA 30 may also contain an amplifier, which will be the output gain of the antenna to a suitable level for the ADC. The digital code from the ADC output is transmitted to the computer 33 for further processing.

MCTG 31 contains N ADC inputs are connected to the outputs of the hydrophones 13. MCTG 31 may also contain N-channel power amplifier, whose task will be the strengthening of the output signals of the hydrophones 13 to a suitable level for the ADC. The digital code from the outputs of all the ADC is passed to the computer 33 for further processing.

To improve the accuracy of calculation of parameters of the output signals of the hydrophones 13 and the antenna 26 is necessary at the hardware level to take into account the knowledge of the magnitude of the frequency of sinusoidal signals applied to the emitters. To do this, ZG 32 generates the second pulsing signal at the hardware level is a multiple of the first pulsing signal supplied to the DAC MCTI 29. This second signal is applied to the control inputs of the ADC CCCA 30 and ADC MCTG 31. Due to this frequency clocking of all ADC exactly at the hardware level, the multiple frequency sinusoidal signal emitters, and hence the hydrophones.

In the particular case MCTG 31 may be made in the form of a single ADC and switch analog signals having N inputs, connected uchenykh to the outputs of the hydrophones 13, and one output connected to the input of this ADC. In this case, the output signals of all of the hydrophones will be iiprovides by one, not simultaneously. Thus, the digitized reports output signals of the hydrophones receive, rather than simultaneously with some of the same time delay between each two signals. Because the value of the time delay and the waveform generated by the emitters (sinusoidal), is known, then, using an appropriate pre-processing of digital codes, you can perform subsequent calculations as if the output signals of all hydrophones ocifrovivaem at the same time. To improve the accuracy of the calculation in this case, the second pulsing signal ZG 32 should be given to the control inputs of the ADC and switch analog signals MCTG 31.

Setup for calibration of linear acoustic antenna operates as follows.

Pre indoors, designed to accommodate the installation, install track 4 with a slope relative to the horizon. Rail 9 path, set the required number of sections hydrochory 1 on trucks 3. In section hydrochory 1 set of rubber o-rings for sealing joints of adjacent sections and the Union nut 7, 8. Through all partitions miss calcu (cut cord of appropriate length) for the last who tried loading the antenna. The Union nut 7 and 8 adjacent sections of the tightening nuts with studs. As a result of this get gidrotamir required length with a single rail haul and fastening of the calibrated antenna.

M emitters 12 and N hydrophones 13 is installed in the intermediate casing 15, which in turn is inserted into the hole 14. Transducers and hydrophones connect the cables to the outputs of MCTI 29 and MCTG 31, respectively.

From the right flange 10 to calke tie the tube 27 with the Shoe 22, the axis 23 and the holder 24. In the holder 24 invest calibrated antenna and fix it by the spring 25. In Shoe insert the following tube 27, which connect with the previous bracket 28. For calcu (Fig. not shown) drag Shoe 22 with the antenna 26 to the inside of hydrochory 1 to achieve the second tube, the edges of hydrochory. Then similar to that described to this design adds the following Shoe 22, the axis 23, the holder 24 and the spring 25, previously investing in the holder antenna 26. This procedure continues until Thor until the entire antenna will not be inside hydrochory, in the middle of it. After that, Calca is attached to the left flange hydrochory 9, which fits tightly to the outer pane 11hydrochory. The antenna 26 is connected through its contains a thermal connector extension cable, the second contains a thermal connector of the extension cable is included in the special hole in the flange of hydroc the steps 10, which in turn hermetically closes the extreme section 1Tohydrochory. In this case the obtained hermetically closed gidrotamir with the antenna inside. An electric cable connected to the antenna output through connector extension cable antenna to CCCA 30.

To fill hydrochory 1 working fluid 2, the valve 5 is closed and the air valve 6 open. Using pump hydroclear is filled with working fluid. Thus the air that fills gidrotamir, as filling the working fluid goes through the valve 6. Because the valve due to the slope of the track, i.e. hydrochory, is located in the most upper part of the air goes almost all. After filling all hydrochory working fluid, the valve 6 is closed and hydroxamate using pump pump the required hydrostatic pressure. The remaining small part of the air dissolved in the working fluid and does not follow-up measurements noticeable distortion.

After the time required for adaptation emitters, hydrophones and antenna to the initial hydrostatic pressure in hydroxamate acoustic field is created using, for example, the known method [2] modeling of acoustic fields. For this purpose, we first created a computer program calculates the amplitude and phase of the output signals of MCTI 29, value is which digital codes are defined in MCTI 29. Also programmed ZG 32 to generate signals with a given frequency. The output signals of MCTI 29 enter the emitters 13, which create in hydroxamate desired acoustic field. The output signals of the hydrophones 13 and calibrated antenna 26 receives on MZTH 31, CCCA 30, respectively, where is converted into digital codes that are entered into the computer 33. A computer program analyzes the digital codes corresponding to output signals of the hydrophones, and if the decision is made to measurements, these codes of conduct necessary calculations for calibration of the antenna.

After the measurement is reset hydrostatic pressure in hydroxamate and opens the air valve 6, through which the internal cavity of hydrochory receives a message with the atmosphere. This opens the valve 5 installed due to the slope of the track at the lowest point of hydrochory 1, and the working fluid by gravity drained from hydrochory.

Unloading the antenna from hydrochory has a procedure reverse to the above procedure, load the antenna in gidrotamir. While the hydrophones and transducers, and cables going to them, remain in their places. Unit is ready for calibration of the next antenna.

Spatial separation of cables with high-voltage signal emitters and to the whiter with low voltage outputs of the hydrophones and the antenna avoids interference, therefore, to improve the accuracy of measurements. Besides, the installation comprises ZG 32 allows the hardware level to take into account the knowledge of the values of the operating frequency of the acoustic field in hydroxamate, which also improves the accuracy of measurements, using appropriate methods of processing digital data, for example [3].

If the result of the operation of the installation, one of the transducers 12 or 13 fails, it without removing the whole stand is replaced with a new Converter.

Thus, unlike the prototype declared in the installation of improved operational capabilities due to mechanical junction of the emitters, hydrophones and calibrated antennas from each other. It simplifies the process of downloading extended antennas inside hydrochory, the process of removing air from hydrochory while filling the working fluid, and the subsequent release of hydrochory from the working fluid. It also improves the measurement accuracy by eliminating electrical interference between the cables and for the account at the hardware level knowledge of the magnitude of the frequency of sinusoidal signals applied to the emitters.

This in turn increases the productivity of the stand, i.e. increases the number of calibration antennas per unit of time. This achieves the above technical R is the result.

Figure 6 presents a photograph illustrating a specific example of implementation calibrating the linear acoustic antennas. In the foreground of this photograph shows the leftmost section hydrochory 11. This section is located on the trolley 31which in turn is located on the track 4. The section has two coupling nuts: left - 71and right - 81. The left side section muffled by the flange 9, to the right side of the section 11docked section 12. The side sections are clearly visible intermediate casing 15, which are mounted hydrophones 13 (pictures not shown). Each hydrophone is your electric cable. On the opposite, invisible in the pictures, the parties similarly situated emitters. Under the track, the locations of the wheels of the truck, put plates of different thickness, which provides the slope of the track. In the upper left part of the section 11there is an air valve 6. In the background of the photo is visible to the computer 33 and the rack with electronic equipment installation.

Sources of information

1. U.S. patent No. 4468760, CL 367 - 13 (H 04 R 29/00), 1984 - the prototype.

2. RF patent №2116705, CL H 04 R 29/00, 1998.

3. RF patent №2142141, CL G 01 R 27/28, H 04 R 29/00, G 01 L 27/00, 1999.

1. Setup for calibration of linear acoustic antennas containing closed the th gidrotamir, filled with the working fluid and is made with the ability to work at elevated hydrostatic pressure, the emitters and N hydrophones inside hydrochory, the device pullback and consolidation of the calibrated antenna inside hydrochory, including the guide and the holders of the antenna, computer, multi-channel digital path emitters, including digital to analog converters, multichannel digital channel hydrophones, including analog-to-digital converters, digital channel measured antenna comprising an analog-to-digital Converter, and the input emitters connected to the outputs of multi-channel digital channel emitters, the outputs of the hydrophones are connected to the inputs of multi-channel digital channel hydrophones, the antenna output is connected to the input of a digital channel measured antenna and all digital paths and the channel is connected to a computer, characterized in that the guide device pullback and consolidation of the calibrated antenna attached to the wall of hydrochory, and the holders of the antenna is arranged to move together with the antenna inside hydrochory guide, hydroclear and guide device pullback and consolidation of the calibrated antenna is made of separate sections joined together in a single entity, section hydrochory joined germ is icno, hydroclear is located relative to the horizon with a longitudinal gradient in the lower part of hydrochory mounted crane, and at the top of the air valve, the transducers and hydrophones inserted into the same intermediate casing, hermetically installed transducers and hydrophones in the case of hydrochory with its outer side, while the transformative elements of the transducers and hydrophones are located inside hydrochory and connectors transducers and hydrophones for connecting electrical signals outside hydrochory.

2. Installation according to claim 1, characterized in that section hydrochory are located on the same trucks that are installed on the track.

3. Installation according to claim 1, characterized in that the intermediate casing with hydrophones placed opposite the intermediate buildings with radiators.

4. Installation according to claim 1, characterized in that section of the guide device pullback and consolidation of the calibrated antenna mounted in two clamps attached to the wall section hydrochory, when this section of the guide is configured to move in these clips.

5. Installation according to claim 1, characterized in that it further comprises a master oscillator, the output of which is connected to the control inputs of digital to analog converters digital multichannel tract emitters, and controlled the entrance to the computer.

6. Installation according to claim 5, characterized in that the second output of the master oscillator is additionally connected to the control inputs of analog-to-digital converters multi-channel digital channel hydrophones and digital channel calibrated antenna.

7. Installation according to claim 1, characterized in that the multi-channel digital channel hydrophones made in the form of analog-to-digital Converter and the switch analog signals having N inputs connected to the outputs of the hydrophones, and one output connected to the input of analog-to-digital Converter.

8. Installation according to claim 5 or 7, characterized in that the second output of the master oscillator is connected to the control inputs of analog-to-digital Converter and the switch analog signals of multi-channel digital channel hydrophones.



 

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