CN107731218B - Reciprocating underwater very low frequency sound source - Google Patents
Reciprocating underwater very low frequency sound source Download PDFInfo
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- CN107731218B CN107731218B CN201710894282.8A CN201710894282A CN107731218B CN 107731218 B CN107731218 B CN 107731218B CN 201710894282 A CN201710894282 A CN 201710894282A CN 107731218 B CN107731218 B CN 107731218B
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- sound source
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K15/00—Acoustics not otherwise provided for
- G10K15/04—Sound-producing devices
- G10K15/06—Sound-producing devices using electric discharge
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K15/00—Acoustics not otherwise provided for
- G10K15/04—Sound-producing devices
- G10K15/043—Sound-producing devices producing shock waves
Abstract
The invention provides a reciprocating underwater very low frequency sound source. Including tearing open the electric impact rammer of handrail and rammer plate, converter and sound insulation cover, the bottom installation excitation pole of electric impact rammer, the tip installation piston of excitation pole, the upper portion sectional fixture of electric impact rammer, the one end of balance bar is fixed in on the anchor clamps, the other end installation flat block of balance bar, erection bracing frame in the sound insulation cover, the electric impact rammer is installed on the support frame, the whole electric impact rammer of sound insulation cover parcel, the bottom of sound insulation cover sets up aerifys the gasbag, the power input mechanism of electric impact rammer is connected to the converter. The working frequency of the sound source is 7-10Hz, the reciprocating mechanism is adopted to push the piston to move periodically to generate a very low frequency sound wave, the equipment composition is simple, the electric energy conversion efficiency is high, the engineering practicability is strong, and the sound source is suitable for being used as a very low frequency sound source during underwater sound detection or remote sound transmission.
Description
Technical Field
The invention relates to an underwater very low frequency sound source.
Background
Currently, the commonly used underwater sound sources are: explosive explosion sound sources, electroacoustic transducer sound sources, parametric array sound sources, hydrodynamic sound sources, electromagnetic sound sources, laser sound sources, plasma sound sources and the like. Among these sound sources, only explosive explosion sound sources and hydrodynamic sound sources can generate low-frequency sound waves of 20Hz or less and also have a high sound source level. The hydrodynamic sound source generates sound waves by adopting the instant release of airflow, and the working mode is similar to that of an explosive explosion sound source. The repeatability of the acoustic signals generated by these sources is poor due to the effects of explosive explosion and instantaneous release of air flow, which are influenced by pressure, water temperature, and the amount of charge and aeration. The plasma sound source is instantly ignited and exploded by electric sparks to generate sound waves, the working principle is similar to that of explosive explosion sound sources and hydrodynamic sound sources, and the problems of poor repeatability of sound signals and the like exist. Although the parametric array sound source can generate low-frequency sound waves, the conversion efficiency is extremely low. The sound source of the electroacoustic transducer utilizes the resonance of the transducer to realize sound wave emission, and because the wavelength of the very low frequency sound wave is long, for example, when the wavelength is 10Hz, the wavelength of the underwater sound wave is 150m, which makes the very low frequency electroacoustic transducer difficult to realize miniaturization. A typical electromagnetic low-frequency sound source is manufactured by DP of uk, with a type UW350, and a minimum operating frequency of 20Hz, but during low-frequency operation, the rubber ring sealed between the piston and the cylinder at the front end of the sound source is easily torn, which causes water to enter the electronic compartment and the sound source to fail. In addition, when an electroacoustic transducer sound source, a parametric array sound source and an electromagnetic sound source are used, a signal source and a power amplifier are required, and the matching between the sound source and the power amplifier needs to be considered, so that the system composition is complicated.
At present, a very low frequency underwater sound source is needed for ground sound detection and remote sound propagation research, but the modes of generating the very low frequency sound waves have the problems of poor repeatability, low radiation efficiency, vibration crack of a rubber ring and the like, so that a new mode of generating the very low frequency sound waves is urgently needed to be researched.
Based on the principle of an electrodynamic transducer, a 5Hz-1000Hz very low frequency broadband emission sound source (Vandaparian, acoustic technology, 2013) is developed to be a 5Hz-1000Hz ultra-wideband very low frequency sound source. However, the total mass of the sound source is 900kg, and when the sound source is used, a signal source and a power amplifier must be matched, so that the system composition is complicated, and the test implementation is difficult.
The research on the high-power very-low-frequency underwater sound source (Phragmites, Phragmites university Phragmites paper 2011) establishes an equivalent magnetic circuit model, a mechanical vibration dynamics model and a dynamic characteristic differential equation set of the electromagnetic type very-low-frequency sound source, develops the electromagnetic type driving high-power very-low-frequency underwater sound source, and can realize sound wave emission of 5Hz-500 Hz. However, when the sound source is used, pressure compensation needs to be considered, and a signal source and a power amplifier need to be matched, so that the system composition is complicated, and the test implementation is difficult.
The electric impact rammer is a device for ramming foundation in construction operation of building and bridge, etc. and is characterized by that after the rotation of motor is passed through crankshaft and speed-reducing mechanism, the spring is compressed to drive ramming plate to implement reciprocating linear motion. Because the ramming plate forms a certain angle with the ground, the ramming plate can also advance at a certain speed in the process of ramming the foundation. The electric impact rammer has a large weight, and the phenomenon of oil leakage of a crankshaft or breakage of a spring and the like often occurs, so the electric impact rammer cannot be used on hard ground and can only be used for ramming such as soil, clay, sandy soil, barren concrete and the like.
Disclosure of Invention
The invention aims to provide a reciprocating underwater very low frequency sound source which is simple in composition, large in vibration amplitude and good in sound signal repeatability.
The purpose of the invention is realized as follows: including tearing open the electric impact rammer of handrail and rammer plate, converter and sound insulation cover, the bottom installation excitation pole of electric impact rammer, the tip installation piston of excitation pole, the upper portion sectional fixture of electric impact rammer, the one end of balance bar is fixed in on the anchor clamps, the other end installation flat block of balance bar, erection bracing frame in the sound insulation cover, the electric impact rammer is installed on the support frame, the whole electric impact rammer of sound insulation cover parcel, the bottom of sound insulation cover sets up aerifys the gasbag, the power input mechanism of electric impact rammer is connected to the converter.
The present invention may further comprise:
1. the electric impact rammer is provided with a shock absorber, and the support frame is fixed at the position of the shock absorber of the electric impact rammer.
2. The balance bar is a threaded steel rod, the balancing block is a cubic steel block, a through hole is formed in the middle of the balancing block, the balancing block is sleeved on the balance bar through the through hole in the middle, and adjusting nuts are arranged on two sides of the balancing block.
3. The anchor clamps are made by the stainless steel, have the cylinder of taking the internal screw thread at anchor clamps top, are 60 degrees between cylinder and the anchor clamps, and the compensating bar is installed on the cylinder.
The invention uses the working principle of the electric impact rammer for reference, processes and transforms the electric impact rammer, manufactures an underwater very low frequency sound source, has the working frequency of 7Hz-10Hz, and has the characteristics of simple equipment composition, large vibration amplitude, good sound signal repeatability and the like.
The invention has the advantages that: firstly, the rotating force of a motor is converted into the force for driving an excitation rod and a piston to do linear reciprocating motion by utilizing a crankshaft, a speed reducing mechanism, a spring and the like in the electric battering ram, and the piston is pushed to do periodic reciprocating motion underwater, so that a very low frequency sound wave signal is generated; secondly, because adopt electronic impact rammer to realize the reciprocating motion of piston irradiator, do not have the rubber structure, can avoid like electromagnetic type sound source well: when low-frequency sound waves are radiated, the rubber ring is torn due to too large amplitude; thirdly, because the electric impact rammer drives the exciting rod and the piston to impact the water medium to generate sound wave radiation, and water is a medium with good flexibility, when resistance is applied to a piston radiator, a spring in the electric impact rammer can be well protected, the electric impact rammer is prevented from being broken, and the electric impact rammer is small in damage, so that when the sound source is used in water, the working time of the sound source is far longer than that of the electric impact rammer in the process of ramming a foundation, the electric impact rammer can be used for a long time, and the sound wave can be stably radiated for a long time; finally, the engineering practicability of the very low frequency sound source is very strong, and the emission of underwater sound waves with different frequencies can be realized only by adjusting the working frequency of the frequency converter in the using process, so that the using process is simpler than that of a conventional electroacoustic transducer sound source, a parametric array sound source and an electromagnetic sound source, and the problems of signal source amplitude, power amplifier gain, matching with the sound source and the like do not need to be considered;
the invention has the beneficial effects that firstly, all the equipment is designed in a mechanical structure, so that the operation process has good repeatability, and the generated sound wave signals have single frequency and very low frequency, the frequency components of the signals are clean, the continuous operation can be carried out for a long time, and the requirements of external field test testing can be met; secondly, noise pollution generated by the motor in the running process is isolated by the sound insulation cover, and the vibration of a ramming body, the sound insulation cover and the like caused by the rotation of the motor in the electric impact rammer is inhibited by the inflatable air bag, so that underwater radiation noise caused by the vibration of the ramming body and the like of the electric impact rammer is reliably reduced; and finally, the underwater piston is adopted for sound wave emission, no additional circuit or waterproof design is provided, the structure is simple, and the installation and the use are convenient.
Drawings
Fig. 1 is a schematic view of the overall structure of a reciprocating underwater very low frequency sound source according to the present invention.
Figure 2 is a side view of the reciprocating underwater very low frequency sound source of the present invention in its entirety.
Fig. 3 is a top view of the piston.
Fig. 4 is a schematic view of a fixture.
Fig. 5 is a schematic view of the support frame.
Fig. 6 is a schematic view of the excitation lever.
FIG. 7 is a schematic view of a shock rod flange.
Fig. 8 is a side view of the sound-proof enclosure.
Fig. 9 is a top view of the sound-proof enclosure.
FIG. 10 shows the results of a spectrum test of 10Hz sound emitted by the very low frequency sound source.
Detailed Description
The invention is described in more detail below by way of example.
The underwater very low frequency sound source designed by adopting the reciprocating mechanism comprises an electric impact rammer 1, an excitation rod 2, a piston 3, a clamp 4, a balance bar 5, a balancing block 6, a support frame 7, a sound insulation cover 8, an inflatable air bag 9 and a frequency converter. The handrail is removed from the electric impact rammer 1, the rammer plate is rammed, the vibration exciting rod mounting flange 21 of the vibration exciting rod 2 is connected to the bottom of the electric impact rammer 1, the piston 3 is connected to the other end of the vibration exciting rod 2, the clamp 4 runs through the upper portion of the electric impact rammer 1, one end of the balance bar 5 is fixed on the clamp 4, the flat block 6 is installed and installed to the other end, the one end of the support frame 7 is fixed in the shock absorber 11 of the electric impact rammer 1, the other end is fixed on the sound insulation cover 8, the sound insulation cover 8 wraps the electric impact rammer 1, the inflatable airbag 9 is placed at the bottom of the sound insulation cover 8, and.
The model of the electric battering ram 1 is HCD80, the matching power is 2.2kW, the mass of the whole electric battering ram is about 80kg, the handrail and the ramming plate are removed, and the power supply input mechanism is connected with the frequency converter.
The exciting rod 2 is made of stainless steel, the exciting rod 2 is composed of an exciting rod mounting flange 21 and an exciting rod body 22, the specification of the exciting rod mounting flange 21 is consistent with that of a tamping plate mounting flange of the electric impact rammer 1, and the exciting rod body 22 is a slender cylindrical rod, and the bottom end of the exciting rod body is provided with threads.
The piston radiator 3 is made of stainless steel and is of a disc structure with a hole in the middle, a through hole with threads is formed in the center of the disc, the thread specification is matched with that of the exciting rod, and the hole diameter of the hole is slightly larger than the outer diameter of the exciting rod body 2.
The clamp 4 is made of stainless steel, a cylinder 45 with internal threads is arranged at the top end of the clamp 4, an angle of 60 degrees is formed between the cylinder 45 and the clamp 4, and a through hole 41 and a through hole 42 are formed at the lower end of the clamp 4; the clamp can be fixed on the upper part of the electric impact ram by locking the long stud and the nut.
The balance bar 5 is a steel rod with threads, the specification of the threads is matched with the specification of the internal threads of the cylinder in the clamp 4, one end of the balance bar 5 is screwed into the cylinder 45 in the clamp 4, and the balance bar 5 is fixed at one end of the clamp 4.
The balancing block 6 is a cubic steel block, and a through hole is formed in the middle of the balancing block 6;
the support frame 7 is a thick steel plate which is bent at a right angle, through holes are formed in two ends of the thick steel plate, one end of the support frame is fixed to a shock absorber of the electric impact rammer through bolts, and the other end of the support frame is fixed to the sound insulation cover through bolts and nuts. After the vibration exciting rod at the bottom end of the electric battering ram is kept in a vertical state, nuts at two ends of the balancing block are locked, and the balancing block is fixed on the balance bar.
The sound insulation cover 8 is made of stainless steel, the main body structure is cylindrical, the top end is rectangular, the bottom end is of a double-layer cylindrical structure, a fixing frame 81 is arranged on the inner side of the sound insulation cover 8, an assembling hole is formed in the fixing frame 81, a flange 82 is arranged on the outer side of the sound insulation cover 8, and the sound insulation cover 8 is divided into a left sound insulation cover 83 and a right sound insulation cover 84 by taking the flange 82 as a boundary; the left part and the right part can be fastened together through a flange, a bolt and a nut, and a fixing frame is arranged in the sound insulation cover.
The inflatable air bag 9 is made of butyl rubber, is placed in the double-layer cylindrical shell structure at the bottom end of the sound insulation cover 8, is inflated, and generates buoyancy force to enable the whole electric impact rammer to leave the water surface so as to prevent the mechanical structure of the electric impact rammer from being wetted by water;
the frequency converter is of a Siemens V20 series, has a rated power of 4.0kW, and is used for carrying out frequency conversion on a motor in the electric impact rammer 1 to realize reciprocating motion of the exciting rod 2 and the piston 3 under different frequencies;
the assembly sequence is as follows: the left sound insulation cover 83 and the right sound insulation cover 84 are combined together, bolts penetrate through the flange 82, and the sound insulation cover 8 is assembled by locking and fixing through nuts; the handle and the tamping plate of the electric impact rammer 1 are removed, the support frame 7 is fixed on the electric impact rammer 1 by using the bolts 71 and 72 at the shock absorber 11 of the electric impact rammer 1, then the electric impact rammer 1 and the support frame 7 are placed into the sound insulation cover 8, the bolts penetrate through the fixing frame 81 and the support frame 7 and then are locked and fixed by using the nuts, and thus, the electric impact rammer 1 and the sound insulation cover 8 are integrated; the clamp 4 penetrates through the upper part of the electric impact rammer 1, the long stud 43 penetrates through the through hole 41 and the through hole 42, and the clamp is locked by the nut 44, so that the clamp 4 is fixed on the upper part of the electric impact rammer 1; screwing the balance bar 5 into the cylinder 45 of the clamp 4, penetrating the balance block 6 through the balance bar 5, and pre-locking nuts 61 and 62 at two ends of the balance bar 5; the sound insulation cover 8, the electric impact rammer 1, the support frame 7, the clamp 4, the balance bar 5 and the balancing block 6 are integrally suspended; the mounting flange 21 of the exciting rod is penetrated to the bottom of the electric impact rammer 1 and is locked by a bolt, the exciting rod 2 is fixed at the bottom of the electric impact rammer 1, the piston 3 penetrates through the rod body 22 of the exciting rod, and the piston radiator 3 is fixed on the rod body 22 of the exciting rod by the nut 31 and the nut 32; the positions of the nut 61 and the nut 62 and the position of the balance block 6 on the balance bar 5 are adjusted, so that the rod body 22 of the shock excitation rod is in a vertical state, the piston radiator 3 is in a horizontal state, the whole body of the very low frequency sound source can be lifted, the piston radiator 3 enters water, the inflatable air bag 9 is placed at the bottom end in the sound insulation cover 8, and the air is inflated, so that the bottom end of the electric impact rammer 1 is away from the water surface; the frequency converter is connected to a power input mechanism of the electric impact rammer 1, and the frequency of the frequency converter is adjusted, so that the piston radiator 3 can reciprocate in water at a certain frequency, and a very low frequency sound wave signal is generated.
When the very low frequency source was tested in a water tank, the spectral analysis results obtained by the hydrophones are shown in fig. 10, with stable spectral amplitudes.
The working frequency of the sound source is (7-10) Hz, the reciprocating mechanism is adopted to push the piston to move periodically to generate very low frequency sound waves, the equipment composition is simple, the electric energy conversion efficiency is high, the engineering practicability is strong, and the sound source is suitable for being used as a very low frequency sound source during underwater sound detection or remote sound transmission. The present invention has been described in detail with reference to the embodiments, and various modifications thereof can be made by those skilled in the art based on the above description. Therefore, certain details of the embodiments are not to be interpreted as limiting, and the scope of the invention is to be defined by the appended claims.
Claims (5)
1. The utility model provides a reciprocating type underwater very low frequency sound source, is including tearing open electronic battering ram, converter and the sound proof cover of handrail and rammer board, characterized by: the bottom of electric battering ram installs the excitation rod, and the tip installation piston of excitation rod, the upper portion sectional fixture of electric battering ram, on the one end of balance bar was fixed in anchor clamps, the other end installation flat piece of balance bar, erection bracing frame in the sound proof cover, electric battering ram installs on the support frame, whole electric battering ram of sound proof cover parcel, and the bottom of sound proof cover sets up aerifys, and the power input mechanism of electric battering ram is connected to the converter.
2. The reciprocating underwater very low frequency sound source of claim 1, wherein: the electric impact rammer is provided with a shock absorber, and the support frame is fixed at the position of the shock absorber of the electric impact rammer.
3. A reciprocating underwater very low frequency sound source as claimed in claim 1 or 2, wherein: the balance bar is a threaded steel rod, the balancing block is a cubic steel block, a through hole is formed in the middle of the balancing block, the balancing block is sleeved on the balance bar through the through hole in the middle, and adjusting nuts are arranged on two sides of the balancing block.
4. A reciprocating underwater very low frequency sound source as claimed in claim 1 or 2, wherein: the anchor clamps are made by the stainless steel, have the cylinder of taking the internal screw thread at anchor clamps top, are 60 degrees between cylinder and the anchor clamps, and the compensating bar is installed on the cylinder.
5. A reciprocating underwater very low frequency sound source as claimed in claim 3, wherein: the anchor clamps are made by the stainless steel, have the cylinder of taking the internal screw thread at anchor clamps top, are 60 degrees between cylinder and the anchor clamps, and the compensating bar is installed on the cylinder.
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| CN201710894282.8A CN107731218B (en) | 2017-09-28 | 2017-09-28 | Reciprocating underwater very low frequency sound source |
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| CN201710894282.8A CN107731218B (en) | 2017-09-28 | 2017-09-28 | Reciprocating underwater very low frequency sound source |
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| CN107731218A CN107731218A (en) | 2018-02-23 |
| CN107731218B true CN107731218B (en) | 2021-07-06 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1193557A (en) * | 1997-03-13 | 1998-09-23 | 考克库姆·索尼克斯公司 | Sound generator |
| DE102007018841A1 (en) * | 2007-04-20 | 2008-10-30 | Mts Europe Gmbh | Impulse waves producing device for medical treatment of patient, has rear retaining surface limiting transverse path between ultimate state, which corresponds to small distance between electrodes, and another ultimate state |
| CN102269816A (en) * | 2011-05-06 | 2011-12-07 | 中南大学 | Ultrasonic underwater microtopography detection testing device and method |
| CN104038862A (en) * | 2013-03-06 | 2014-09-10 | 中国科学院声学研究所 | Electric acoustic transmitting transducer |
| CN105170438A (en) * | 2015-10-15 | 2015-12-23 | 哈尔滨工程大学 | Broadband vibrating device for underwater cylindrical shell |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2685784A1 (en) * | 1991-12-27 | 1993-07-02 | Gagno Robert | Compressed-gas transducer for producing submarine sound vibrations |
| CA2526309C (en) * | 2004-12-21 | 2012-04-17 | Her Majesty In Right Of Canada As Represented By The Minister Of Nationa L Defence | Portable low frequency projector |
| CN103021396A (en) * | 2012-12-17 | 2013-04-03 | 中国船舶重工集团公司第七一五研究所 | Deep-water broadband transducer with ultralow backward radiation |
| CN103236256B (en) * | 2013-03-25 | 2015-10-28 | 中国船舶工业系统工程研究院 | A kind of percussive low-frequency underwater acoustic transducer driven based on energy by ocean current |
-
2017
- 2017-09-28 CN CN201710894282.8A patent/CN107731218B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1193557A (en) * | 1997-03-13 | 1998-09-23 | 考克库姆·索尼克斯公司 | Sound generator |
| DE102007018841A1 (en) * | 2007-04-20 | 2008-10-30 | Mts Europe Gmbh | Impulse waves producing device for medical treatment of patient, has rear retaining surface limiting transverse path between ultimate state, which corresponds to small distance between electrodes, and another ultimate state |
| CN102269816A (en) * | 2011-05-06 | 2011-12-07 | 中南大学 | Ultrasonic underwater microtopography detection testing device and method |
| CN104038862A (en) * | 2013-03-06 | 2014-09-10 | 中国科学院声学研究所 | Electric acoustic transmitting transducer |
| CN105170438A (en) * | 2015-10-15 | 2015-12-23 | 哈尔滨工程大学 | Broadband vibrating device for underwater cylindrical shell |
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