CN105698923A - Method for calculating radiation noise generated by pipe wall of water-filling pipeline during reverberation method - Google Patents
Method for calculating radiation noise generated by pipe wall of water-filling pipeline during reverberation method Download PDFInfo
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- CN105698923A CN105698923A CN201610130814.6A CN201610130814A CN105698923A CN 105698923 A CN105698923 A CN 105698923A CN 201610130814 A CN201610130814 A CN 201610130814A CN 105698923 A CN105698923 A CN 105698923A
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- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
Abstract
The invention discloses a method for calculating the radiation noise generated by the pipe wall of a water-filling pipeline during the reverberation method. According to the method, firstly, the radiation noise and the jet noise, generated due to the vibration of the pipe wall of a water-filling pipeline, are measured based on the reverberation method. Secondly, only the jet noise of the water-filling pipeline is measured and obtained based on the reverberation method, so that the radiation noise of the underwater water-filling pipeline generated during the vibration process is obtained. The above method is simple in calculation and high in efficiency. The radiation noise and the jet noise, generated by the pipe wall of the water-filling pipeline in a single non-noise-elimination pool and measured based on the reverberation method, is subtracted by the jet noise of the water-filling pipeline measured based on the reverberation method. In this way, the radiation noise of the water-filling pipeline generated during the vibration process is obtained.
Description
Technical field
The invention belongs to acoustic measurement field, particularly relate to and a kind of calculate the method that water-filled pipe in reverberation method is produced radiated noise by tube wall。
Background technology
The radiated noise of water-filled pipe is made up of two parts under water: one is that water in water-filled pipe is when flowing, run into the change (when amassing change such as elbow, pipeline section) of pipeline configuration shape, produce radiated noise because of the interaction of current and pipeline configuration shape；If the absolute roughness of tube wall is excessive, when water flows fast through, also can encourage tube wall, produce radiated noise；When the water pump as jet source is as the great vibrations of self is transferred to water-filled pipe under water, thus producing radiated noise；This noise like all produces because of tube wall vibration, is called tube wall radiated noise；Two is owing to the water in water-filled pipe is from when managing interior ejection, and because sharply blending between static water, both interact, and produce radiated noise, and this noise like produces because of submerged jet, is called jet noise；Therefore, when utilizing reverberation method to carry out the test of water-filled pipe radiated noise, hydrophone in the acoustical signal gathered, the mixing of both noises is superimposed, and this is that the tube wall radiated noise evaluating water-filled pipe brings difficulty。
Patent CN101368845A relates to draining noise sensing chamber and detection method thereof, it is possible to the noise of multiple pipe fitting and tubing is carried out test comparison, provides test platform for exploitation low noise drainage pipe pipe fitting。This patent, for the noise measuring when draining of the drainage pipeline in the air being, has pertained only to the noise propagated in atmosphere owing to current encourage tube wall to produce, it does not have when relating to current outlet spout, the jet noise produced because current blend with air。
What patent CN104132727A proposed is a kind of high-rise/super high-rise building drainage pipeline noise measuring system and method for testing, provides reliably with reference to test data at the noiseproof feature of actual skyscraper draining for each tubing。When this patent relates to having current to flow in drain pipe, the noise propagated in atmosphere that excitation tube wall is formed, owing to test system is the tubing of a circulation, it is not related to the jet noise produced when current flow out from the mouth of pipe。
The drainage pipeline radiated noise test carried out in atmosphere, the interaction of air dielectric and pipeline need not be considered, i.e. the coupling of pipeline and air dielectric, but then must take into the interaction of pipeline and aqueous medium under water, the characteristic impedance of such as steel pipe is than the characteristic impedance of water only big 30 times, the characteristic impedance of igelite stereoplasm tube is than the characteristic impedance of water only big 5 times, owing to the acoustic characteristic impedance of air and aqueous medium differs nearly 3500 times, therefore, drainage pipeline test system and method for testing in air are not appropriate for being applied to the evaluation of water-filled pipe radiated noise under water。
Summary of the invention
It is an object of the invention to provide a kind of computational methods simple, calculate the method that in reverberation method, water-filled pipe is produced radiated noise by tube wall。
A kind of calculate the method that water-filled pipe in reverberation method is produced radiated noise by tube wall, utilize reverberation method measurement to obtain radiated noise and jet noise that water-filled pipe is produced by tube wall vibration, deduct and utilize reverberation method measurement to obtain water-filled pipe only to produce jet noise, thus obtaining the radiated noise that water-filled pipe is produced by tube wall vibration under water。
The present invention is a kind of calculates the method that in reverberation method, water-filled pipe is produced radiated noise by tube wall, it is also possible to including:
The detailed process of 1, utilize reverberation method measurement to obtain radiated noise that water-filled pipe produces by tube wall vibration and jet noise is:
Step S10: recording the acoustic pressure power spectrum that non-anechoic tank, is produced by background noise, value is designated as dB10；
Step S20: water-filled pipe is immersed in non-anechoic tank, the mouth of pipe is directed at the bottom of the pond of non-anechoic tank, reverberation method measurement obtain the acoustic pressure power spectrum of radiated noise that water-filled pipe produces and jet noise by tube wall vibration, and value is designated as dB20；
Step S30: the state keeping water-filled pipe is constant, one transmitting transducer hanging the water-filled pipe position to non-anechoic tank, reverberation method obtains the acoustic pressure power spectrum of now transmitting transducer radiated noise, value is designated as dB30, and the reverberation time of non-anechoic tank, value is designated as T0；
Step S40: utilize the acoustic pressure power spectrum under transmitting transducer free-field condition, in conjunction with the acoustic pressure power spectrum dB30 in S30 and reverberation time T0, obtain the room constant of non-anechoic tank, utilize this room constant frequency-division section that the acoustic pressure power spectrum in step S20 is modified, obtain water-filled pipe and produced the free field equivalent sound pressure level dB1 and radiated dBW1 of radiated noise and jet noise by tube wall vibration。
2, utilize reverberation method measurement to obtain water-filled pipe only to produce the detailed process of jet noise and be:
Step S11: recording the acoustic pressure power spectrum that non-anechoic tank, is produced by background noise, value is designated as dB11；
Step S21: water-filled pipe is placed on the water surface of non-anechoic tank, after pipe shaft installs vibration damping box, mouth of pipe installation mouth of pipe fixture and baffle, the mouth of pipe of water-filled pipe and the upper surface of baffle have just been immersed in the water surface, being obtained now water-filled pipe by reverberation method measurement and only produce the acoustic pressure power spectrum of jet noise, value is designated as dB21；
Step S31: the state keeping water-filled pipe is constant, is hung to non-anechoic tank, by a transmitting transducer, reverberation method obtains the acoustic pressure power spectrum of now transmitting transducer radiated noise, and value is designated as dB31 and the reverberation time of non-anechoic tank, and value is designated as T1；
Step S41: utilize the acoustic pressure power spectrum data under transmitting transducer free-field condition, in conjunction with the acoustic pressure power spectrum data dB31 in S31 and reverberation time data T1, obtain the room constant of non-anechoic tank, utilize this room constant frequency-division section that the acoustic pressure power spectrum data in step S21 is modified, obtain the free field equivalent sound pressure level dB2 and radiated dBW2 of the noise that water-filled pipe produces because of jet。
3, the free field equivalent sound pressure level dB3 and radiated dBW3 of the radiated noise that waterpipe is produced by tube wall vibration, its value respectively dB2-dB1 and dBW2-dBW1。
Beneficial effect:
The present invention a kind of calculate water-filled pipe in reverberation method produced by tube wall the usefulness of the method for radiated noise be utilize water-filled pipe under water to be produced the mechanism of radiated noise and water-filled pipe by tube wall vibration produce the mechanism of radiated noise because of jet different and carry out: the radiated noise that water-filled pipe is produced by tube wall vibration under water is pipe interior current excitation tube wall hindered or water pump vibration is delivered to tube wall etc. and vibrates and produce；The radiated noise that water-filled pipe produces because of jet is that in pipeline, the current of ejection sharply blend hydrostatic and produce, and belongs to turbulence noise；Therefore, radiated noise that water-filled pipe is produced by tube wall vibration and the radiated noise that water-filled pipe produces because of jet are radiated noises two kinds separate, two kinds of radiated noises are incoherent, and this makes the jet noise of water-filled pipe is produced by tube wall vibration under water radiated noise and water-filled pipe to be added；
The present invention adopts and the mouth of pipe of water-filled pipe is placed on the water surface carries out water-filled pipe and only produce the measurement of jet noise, because the water surface is definitely soft acoustic boundary, the radiation impedance making the mouth of pipe diminishes, reduce coupling between the mouth of pipe with water, reduce further the acoustic radiation ability of the mouth of pipe, it is the pipe diameter place of 7-8 times on distance mouth of pipe axial line owing to jet noise produces maximum position, therefore the mouth of pipe is placed near the water surface and jet noise is not caused damage；Vibration damping box, mouth of pipe fixture and baffle is utilized to inhibit vibration and the mouth of pipe eddy current of tube wall, thus obtaining the jet noise that water-filled pipe only produces；
The present invention is by same non-anechoic tank, utilize reverberation method measurement to obtain radiated noise and jet noise that water-filled pipe is produced by tube wall vibration, deduct the jet noise of only generation after the tube wall of water-filled pipe is carried out vibration damping and killer tube opening vortex that reverberation method is measured, thus obtaining the radiated noise that water-filled pipe is produced under water by tube wall vibration。
Accompanying drawing explanation
Fig. 1 is reverberation method when measuring the radiated noise that produced by tube wall vibration of water-filled pipe and jet noise, and water-filled pipe is at the placement schematic diagram of non-anechoic tank,；
Fig. 2 is that reverberation method measures water-filled pipe when only producing jet noise, and water-filled pipe is at the placement schematic diagram of non-anechoic tank,；
Fig. 3 is that reverberation method measures water-filled pipe when only producing jet noise, the killer tube wall vibrations adopt water-filled pipe and the schematic diagram of mouth of pipe vortex device；
Fig. 4 is that reverberation method measures water-filled pipe vibration damping box structure top view when only producing jet noise, to the killer tube wall vibrations that water-filled pipe adopts；
The mouth of pipe fixture suppressing water-filled pipe mouth of pipe eddy current and baffle structure top view when Fig. 5 is reverberation method measurement water-filled pipe jet noise, to water-filled pipe employing；
Fig. 6 is that reverberation method measures water-filled pipe by the flow chart of steps in tube wall vibration generation radiated noise and jet noise task；
Fig. 7 is that reverberation method measurement water-filled pipe only produces the flow chart of steps in jet noise task；
Fig. 8 is in the present embodiment, reverberation method radiated noise that the water-filled pipe measured is produced by tube wall vibration and the free field equivalent sound pressure level figure of jet noise；
Fig. 9 is in the present embodiment, reverberation method the water-filled pipe measured only produces the free field equivalent sound pressure level figure of jet noise；
Figure 10 is in the present embodiment, utilizes the water-filled pipe that the computational methods of the present invention obtain to be produced the free field equivalent sound pressure level figure of radiated noise by tube wall vibration。
Detailed description of the invention
Below in conjunction with accompanying drawing 1～accompanying drawing 10, the present invention is described in further details。
It is an object of the invention to provide and a kind of calculate the method that water-filled pipe in reverberation method is produced radiated noise by tube wall, can in the radiated noise of the water-filled pipe under water test that reverberation method carries out, the radiated noise produced by tube wall vibration for evaluating water-filled pipe provides a kind of computational methods。
A kind of calculate the method that water-filled pipe in reverberation method is produced radiated noise by tube wall, based on the basis that non-anechoic tank, adopts the water-filled pipe radiated noise that reverberation method is carried out to test, the radiated noise produced by tube wall vibration including the water-filled pipe of reverberation method measurement and jet noise, the water-filled pipe that reverberation method is measured only produces jet noise two main tasks；
The water-filled pipe that described reverberation method is measured is produced the task of radiated noise and jet noise by tube wall vibration, comprises the following steps:
Step S10: the measurement of non-anechoic tank, background noise, records the acoustic pressure power spectrum that non-anechoic tank, is produced by background noise, and value is designated as dB10；
Step S20: water-filled pipe is immersed in non-anechoic tank, the mouth of pipe is directed at the bottom of the pond of non-anechoic tank, reverberation method measurement obtain the acoustic pressure power spectrum of radiated noise that water-filled pipe produces and jet noise by tube wall vibration, and value is designated as dB20；
Step S30: the state keeping water-filled pipe is constant, a transmitting transducer hangs the water-filled pipe position to non-anechoic tank, reverberation method obtains the acoustic pressure power spectrum of now transmitting transducer radiated noise, and value is designated as dB30；Meanwhile, measuring the reverberation time of non-anechoic tank, value is designated as T0；
Step S40: utilize the acoustic pressure power spectrum under transmitting transducer free-field condition, in conjunction with the acoustic pressure power spectrum dB30 in S30 and reverberation time T0, obtain the room constant of non-anechoic tank, utilize this room constant frequency-division section that the acoustic pressure power spectrum in step S20 is modified, obtain the free field equivalent sound pressure level dB1 and radiated dBW1 of radiated noise that water-filled pipe produces by tube wall vibration and jet noise；
The water-filled pipe that described reverberation method is measured only produces the task of jet noise, comprises the following steps:
Step S11: the hum measurement of non-anechoic tank, records the acoustic pressure power spectrum that non-anechoic tank, is produced by background noise, and value is designated as dB11；
Step S21: water-filled pipe is placed on the water surface of non-anechoic tank, after pipe shaft installs vibration damping box, mouth of pipe installation mouth of pipe fixture and baffle, the mouth of pipe of water-filled pipe and the upper surface of baffle have just been immersed in the water surface, being obtained acoustic pressure power spectrum when water-filled pipe only produces jet noise by reverberation method measurement, value is designated as dB21；
Step S31: the state keeping water-filled pipe is constant, is hung by a transmitting transducer to non-anechoic tank, reverberation method obtains the acoustic pressure power spectrum of transmitting transducer radiated noise, and value is designated as dB31；Meanwhile, measuring the reverberation time of non-anechoic tank, value is designated as T1；
Step S41: utilize the acoustic pressure power spectrum under transmitting transducer free-field condition, in conjunction with the acoustic pressure power spectrum dB31 in S31 and reverberation time T1, obtain the room constant of non-anechoic tank, utilize this room constant frequency-division section that the acoustic pressure power spectrum in step S21 is modified, obtain water-filled pipe and only produce the free field equivalent sound pressure level dB2 and radiated dBW2 of jet noise；
Water-filled pipe is produced the free field equivalent sound pressure level dB3 and radiated dBW3 of radiated noise, its value respectively dB2-dB1 and dBW2-dBW1 by tube wall vibration；
The invention discloses and a kind of calculate the method that water-filled pipe in reverberation method is produced radiated noise by tube wall, the radiated noise produced by tube wall vibration including the water-filled pipe of reverberation method measurement and jet noise, the water-filled pipe that reverberation method is measured only produces jet noise two main tasks；The present invention utilizes the mechanism that water-filled pipe is produced radiated noise by tube wall vibration different from the mechanism that water-filled pipe jet noise produces, and two kinds of noises are irrelevant mutually；The radiated noise and jet noise that the water-filled pipe that reverberation method measurement obtains produces will be utilized by tube wall vibration at same non-anechoic tank, deduct the jet noise that the water-filled pipe of reverberation method measurement only produces, thus obtaining the radiated noise that water-filled pipe is produced by tube wall vibration, this is that the tube wall radiated noise ability evaluating water-filled pipe under water provides a kind of computational methods。
A kind of calculating the method that water-filled pipe in reverberation method is produced radiated noise by tube wall, radiated noise that the water-filled pipe measured including reverberation method is produced by tube wall vibration and jet noise, the water-filled pipe that reverberation method is measured only produces jet noise two main tasks；
Water-filled pipe 2 is stainless steel tube, internal water-filling, and specification is DN100, internal diameter 88mm, external diameter 108mm, and pipe thickness is 10mm, and length is 2200mm, termination jet source (centrifugal pump, not shown) of water-filled pipe 2；
The water-filled pipe that reverberation method is measured is produced the task of radiated noise and jet noise by tube wall vibration, comprises the following steps:
Step S10: the measurement of non-anechoic tank, background noise, records the acoustic pressure power spectrum that non-anechoic tank, is produced by background noise, and value is designated as dB10；
Step S20: water-filled pipe is immersed in non-anechoic tank, the mouth of pipe is directed at the bottom of the pond of non-anechoic tank, reverberation method measurement obtain the acoustic pressure power spectrum of radiated noise that water-filled pipe produces and jet noise by tube wall vibration, and value is designated as dB20；
Step S30: the state keeping water-filled pipe is constant, one transmitting transducer hanging the water-filled pipe position to non-anechoic tank, reverberation method obtains the acoustic pressure power spectrum of now transmitting transducer radiated noise, value is designated as dB30, and the reverberation time of non-anechoic tank, value is designated as T0；
Step S40: utilize the acoustic pressure power spectrum under transmitting transducer free-field condition, in conjunction with the acoustic pressure power spectrum dB30 in S30 and reverberation time T0, obtain the room constant of non-anechoic tank, utilize this room constant frequency-division section that the acoustic pressure power spectrum in step S20 is modified, obtain water-filled pipe and produced the free field equivalent sound pressure level dB1 and radiated dBW1 of radiated noise and jet noise by tube wall vibration；
The pipe shaft of water-filled pipe 2 is installed vibration damping box 21, vibration damping box 21 is double-deck semicolumn shell structure, without top cover, lug is had at the two ends of semicolumn shell, the long 200mm of vibration damping box 21, internal diameter is 108mm, thickness of shell is 3mm, inner layer case inner surface girth is 167mm, radial distance between inner surface and the outer surface of shell of inner shell is 106mm, the inner side of two vibration damping boxes 21 is attached on the pipe shaft of water-filled pipe 2, lug is relative, four through holes (Φ 12) on alignment lug, utilize studs 24 and nut 25 (M10) fastening, vibration damping box 21 is made tightly to be fitted on water-filled pipe 2, filling iron ore in vibration damping box 21, the particle size range of iron ore is 0.2mm-2mm, iron ore surface after filling up is concordant with the top of vibration damping box 21, water-filled pipe 2 is installed five altogether to vibration damping box 21, it is spaced apart 100mm between two vibration damping boxes 21, formed by the lug of line and other vibration damping box 21 formed by the lug of two vibration damping boxes 21, between line, angle is 72 degree, namely the lug of vibration damping box 21 is staggered；Mouth of pipe place at water-filled pipe 2, mouth of pipe fixture 22 is installed, mouth of pipe fixture 22 is semicircular ring structure, thickness is 20mm, internal diameter is 108mm, external diameter is 208mm, the girth of internal ring is 167mm, namely in, the radial distance of outer toroid is 100mm, lug is had at the two ends of mouth of pipe fixture 22, lug has through hole (Φ 12), mouth of pipe fixture 22 has through hole (Φ 14), align with the screwed hole center on baffle 23 in through hole center on the mouth of pipe fixture 22 of fastening, two mouth of pipe fixtures 22 are attached near the mouth of pipe of water-filled pipe 2, the thickness that distance is baffle 23 of the plane separation orifice plane of mouth of pipe fixture 22, by relative for the lug of mouth of pipe fixture 22, utilize studs 26 and nut 27 (M10) fastening, mouth of pipe fixture 22 is made to be close to the mouth of pipe place of water-filled pipe 2；Baffle 23 is installed at the mouth of pipe place of water-filled pipe 2, baffle 23 is circular ring structure, thickness is 20mm, internal diameter is 108mm, external diameter is 324mm, baffle 23 has screwed hole (Φ 10), align with the through hole center on mouth of pipe fixture 22 in the center of screwed hole, baffle 23 is placed near the mouth of pipe of water-filled pipe 2, utilize bolt 28 (M10) by after the through hole on mouth of pipe fixture 22, baffle 23 is fastened on mouth of pipe fixture 22, now the plane of the lower surface of baffle 23 and water-filled pipe 2 mouth of pipe is generally flush with, gap between the mouth of pipe of baffle 23 and water-filled pipe 2, it is coated with fluid sealant (model: 704 glue), then paper knife is utilized to strike off, make between the mouth of pipe of baffle 23 and water-filled pipe 2 seamless；
In conjunction with accompanying drawing 1～accompanying drawing 5, wherein, 1 be non-anechoic tank, 2 be water-filled pipe, 21 be vibration damping box, 22 be mouth of pipe fixture, 23 be baffle, 24 be studs, 25 be nut, 26 be studs, 27 be nut, 28 for bolt。
The water-filled pipe that described reverberation method is measured only produces the task of jet noise, comprises the following steps:
Step S11: the hum measurement of non-anechoic tank, records the acoustic pressure power spectrum that non-anechoic tank, is produced by background noise, and value is designated as dB11；
Step S21: water-filled pipe is placed on the water surface of non-anechoic tank, after pipe shaft installs vibration damping box, mouth of pipe installation mouth of pipe fixture and baffle, the mouth of pipe of water-filled pipe and the upper surface of baffle have just been immersed in the water surface, being obtained water-filled pipe by reverberation method measurement and only produce the acoustic pressure power spectrum of jet noise, value is designated as dB21；
Step S31: the state keeping water-filled pipe is constant, is hung by a transmitting transducer to non-anechoic tank, reverberation method obtains the acoustic pressure power spectrum of now transmitting transducer radiated noise, and value is designated as dB31 and the reverberation time data of non-anechoic tank, and value is designated as T1；
Step S41: utilize the acoustic pressure power spectrum under transmitting transducer free-field condition, in conjunction with the acoustic pressure power spectrum dB31 in S31 and reverberation time T1, obtain the room constant of non-anechoic tank, utilize this room constant frequency-division section that the acoustic pressure power spectrum in step S21 is modified, obtain the free field equivalent sound pressure level dB2 and radiated dBW2 of the noise that water-filled pipe produces because of jet；
The free field equivalent sound pressure level dB3 of the radiated noise that water-filled pipe is produced by tube wall vibration and radiated dBW3, its value respectively dB2-dB1 and dBW2-dBW1。
Claims (4)
1. one kind calculates the method that in reverberation method, water-filled pipe is produced radiated noise by tube wall, it is characterized in that: utilize reverberation method measurement to obtain radiated noise and jet noise that water-filled pipe is produced by tube wall vibration, deduct and utilize reverberation method measurement to obtain water-filled pipe only to produce jet noise, thus obtaining the radiated noise that water-filled pipe is produced by tube wall vibration under water。
2. according to claim 1 a kind of calculate the method that water-filled pipe in reverberation method is produced radiated noise by tube wall, it is characterised in that: the detailed process of described utilize reverberation method measurement to obtain radiated noise that water-filled pipe produces by tube wall vibration and jet noise is:
Step S10: recording the acoustic pressure power spectrum that non-anechoic tank, is produced by background noise, value is designated as dB10；
Step S20: water-filled pipe is immersed in non-anechoic tank, the mouth of pipe is directed at the bottom of the pond of non-anechoic tank, reverberation method measurement obtain the acoustic pressure power spectrum of radiated noise that water-filled pipe produces and jet noise by tube wall vibration, and value is designated as dB20；
Step S30: the state keeping water-filled pipe is constant, one transmitting transducer hanging the water-filled pipe position to non-anechoic tank, reverberation method obtains the acoustic pressure power spectrum of now transmitting transducer radiated noise, value is designated as dB30, and the reverberation time of non-anechoic tank, value is designated as T0；
Step S40: utilize the acoustic pressure power spectrum under transmitting transducer free-field condition, in conjunction with the acoustic pressure power spectrum dB30 in S30 and reverberation time T0, obtain the room constant of non-anechoic tank, utilize this room constant frequency-division section that the acoustic pressure power spectrum in step S20 is modified, obtain water-filled pipe and produced the free field equivalent sound pressure level dB1 and radiated dBW1 of radiated noise and jet noise by tube wall vibration。
3. according to claim 1 a kind of calculate the method that water-filled pipe in reverberation method is produced radiated noise by tube wall, it is characterised in that: described utilize reverberation method measurement to obtain water-filled pipe only to produce the detailed process of jet noise and be:
Step S11: recording the acoustic pressure power spectrum that non-anechoic tank, is produced by background noise, value is designated as dB11；
Step S21: water-filled pipe is placed on the water surface of non-anechoic tank, after pipe shaft installs vibration damping box, mouth of pipe installation mouth of pipe fixture and baffle, the mouth of pipe of water-filled pipe and the upper surface of baffle have just been immersed in the water surface, being obtained now water-filled pipe by reverberation method measurement and only produce the acoustic pressure power spectrum of jet noise, value is designated as dB21；
Step S31: the state keeping water-filled pipe is constant, is hung to non-anechoic tank, by a transmitting transducer, reverberation method obtains the acoustic pressure power spectrum of now transmitting transducer radiated noise, and value is designated as dB31 and the reverberation time of non-anechoic tank, and value is designated as T1；
Step S41: utilize the acoustic pressure power spectrum data under transmitting transducer free-field condition, in conjunction with the acoustic pressure power spectrum data dB31 in S31 and reverberation time data T1, obtain the room constant of non-anechoic tank, utilize this room constant frequency-division section that the acoustic pressure power spectrum data in step S21 is modified, obtain the free field equivalent sound pressure level dB2 and radiated dBW2 of the noise that water-filled pipe produces because of jet。
4. according to claim 1 a kind of calculate the method that water-filled pipe in reverberation method is produced radiated noise by tube wall, it is characterized in that: the free field equivalent sound pressure level dB3 of the radiated noise that described waterpipe is produced by tube wall vibration and radiated dBW3, its value respectively dB2-dB1 and dBW2-dBW1。
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| CN111236457A (en) * | 2020-01-09 | 2020-06-05 | 哈尔滨工程大学 | Sound barrier for reducing sound energy loss |
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| CN109238436B (en) * | 2018-09-01 | 2020-09-25 | 哈尔滨工程大学 | Method for measuring transient sound source characteristics in reverberation pool |
| CN111236457A (en) * | 2020-01-09 | 2020-06-05 | 哈尔滨工程大学 | Sound barrier for reducing sound energy loss |
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