CN105784096A - Measurement system and measurement method for jet noise of water filling pipe - Google Patents
Measurement system and measurement method for jet noise of water filling pipe Download PDFInfo
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- CN105784096A CN105784096A CN201610130813.1A CN201610130813A CN105784096A CN 105784096 A CN105784096 A CN 105784096A CN 201610130813 A CN201610130813 A CN 201610130813A CN 105784096 A CN105784096 A CN 105784096A
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- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
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Abstract
The invention discloses a measurement system and a measurement method for jet noise of a water filling pipe. The measurement system comprises the water filling pipe, a reverberation box, a polymethyl methacrylate board and a hydrophone vertical line array. The reverberation box has a steel cuboid structure and is filled with water. The top end of the reverberation box is not provided with a cover, and the bottom is supported by a crossbeam. The polymethyl methacrylate board is mounted in the reverberation box and divides the reverberation box into two parts, namely a jet area and a testing area. The water filling pipe is placed at the jet area of the reverberation box. The hydrophone vertical line array is placed at the testing area in the reverberation box. The measurement system and the measurement method have advantages of reliably eliminating pipe wall radiation noise generated by factors such as water current impact of the water filling pipe or water pump vibration, eliminating flow noise which is generated by hydrophone motion in space averaging. The measurement method for jet noise of the water filling pipe eliminates the effect of a dummy sound caused by water current impact on the hydrophone in measuring the jet noise by a free field. Advantages of a reverberation method are used, thereby reducing workload in measuring the radiation sound power of the jet noise of the water filling pipe by the free field.
Description
Technical field
The invention belongs to acoustic measurement field, particularly relate to measurement system and the measuring method of a kind of water-filled pipe jet noise.
Background technology
Submerged jet noise is usually and is sprayed from the mouth of pipe with certain flow velocity by the water being immersed in the water-filled pipe in water, because sharply blending between current and the hydrostatic of quickly ejection, and the radiated noise that both interact and produce.The magnitude of jet noise (non-cavitation) is typically small, it is easy to be flooded by the radiated noise of tube wall vibration, if utilize continuous moving hydrophone in reverberation method carry out space average go gather jet noise time, the low-speed flow noise produced that then moved continuously by hydrophone will blend in jet noise, and the experimental study of submerged jet noise is very disadvantageous by this.Drainage pipeline noise detection chamber and detection method thereof, what all refer to is the aerial radiated noise test of drainage pipeline to patent (CN104132727A)---a kind of high-rise/super high-rise building drainage pipeline noise measuring system and method for testing and patent (CN101368845A)---；Wang Man is (see applied acoustics, 2003 (1): 35-38) the charging line sound radiation control research carried out, simply place hydrophone sound intensity battle array to evaluate the acoustical behavior of deafener at the mouth of pipe, it does not have the current relating to water-filled pipe quickly spray to hydrostatic measurement system and the measuring method of produced jet noise.
Summary of the invention
It is an object of the invention to provide a kind of simple in construction, the measurement system of the water-filled pipe jet noise that measurement effect is good.The purpose of the present invention also includes the measuring method providing a kind of accurate and effective water-filled pipe jet noise.
The measurement system of a kind of water-filled pipe jet noise, including water-filled pipe, reverberation box, poly (methyl methacrylate) plate and hydrophone vertical linear array；
Reverberation box is steel rectangular structure, internal water-filling, and top uncovered, bottom adopts cross beam support；Poly (methyl methacrylate) plate is arranged on inside reverberation box, and reverberation box is divided into two parts: fluerics and test section；Water-filled pipe is placed on the fluerics of reverberation box；Hydrophone vertical linear array is placed on the test section in reverberation box.
The measurement system of a kind of water-filled pipe jet noise, it is also possible to including:
1, the pipe shaft of water-filled pipe installs N to vibration damping box, vibration damping box is double-deck semicolumn shell structure, without top cover, the internal diameter of vibration damping box and the external diameter of water-filled pipe are identical, there is lug at the two ends of double-deck semicolumn shell structure, and lug has through hole, and the lug of every pair of vibration damping box is relative, connect at lug place, the internal filling iron ore of vibration damping box.
2, the mouth of pipe of water-filled pipe is provided with a line up fixture, and mouth of pipe fixture is semicircular ring structure, and the internal diameter of mouth of pipe fixture and the external diameter of water-filled pipe are identical, the outside of mouth of pipe fixture is with lug, having through hole, the lug of two mouth of pipe fixtures is relative, connects at lug place.
3, the mouth of pipe of water-filled pipe is provided with baffle, and baffle is connected with mouth of pipe fixture；The internal diameter of baffle and the external diameter of water-filled pipe are identical, and the lower surface of baffle and the mouth of pipe of water-filled pipe are generally flush with.
4, a termination jet source of water-filled pipe, the other end of water-filled pipe is placed on the center, fluerics of reverberation box, and the axis of water-filled pipe is perpendicular to the water surface in reverberation box, and the mouth of pipe of water-filled pipe and the upper surface of baffle are immersed under water.
5, the external diameter of baffle is three times of pipe external diameter.
The measuring method of a kind of water-filled pipe jet noise, comprises the following steps,
Step one: by water-filling in reverberation box, measures the background noise at point position place of reverberation box build-in test district by hydrophone vertical linear array, and is undertaken the background noise of different measuring points position suing for peace, on average；
Step 2: the center of fluerics hangs transmitting transducer in reverberation box, measured the acoustic pressure power spectrum at point position place of reverberation box build-in test district, reverberation time by hydrophone vertical linear array, and to the acoustic pressure power spectrum of different measuring points position and the reverberation time sues for peace, on average；
Step 3: after water-filled pipe is installed vibration damping box, mouth of pipe fixture and baffle, the mouth of pipe of water-filled pipe is placed near the water surface so that the water in water-filled pipe is with in speed K injection to the fluerics of reverberation box, and the water of overflow is derived by the guiding device of reverberation box；
Step 4: measured the acoustic pressure power spectrum of the submerged jet noise of the water-filled pipe formation at point position place by hydrophone vertical linear array in reverberation box；
Step 5: utilize the room constant of the transmitting transducer acoustic pressure power spectrum data in free field and reverberation time data calculating reverberation box, acoustic pressure power spectrum in S4 step is modified, then obtains the equivalent free field sound pressure level of water-filled pipe submerged jet noise and the radiated of free field.
Beneficial effect:
Usefulness of the present invention is the experimental test that the case utilizing steel plate to make carries out water-filled pipe jet noise as reverberation box, due to the internal water-filling of reverberation box, outside is air, the characteristic impedance of tank wall is more much larger than the characteristic impedance of air (nearly 80000 times), jet noise is radiated the sound wave of tank wall can well back in reverberation box, and acoustical energy losses only small (being about one thousandth), by calibrating the room constant of reverberation box, it becomes possible to obtain the equivalent free field sound pressure level of water-filled pipe jet noise and the radiated of free field；Adopt installation vibration damping box on the pipe shaft of water-filled pipe to carry out pressing down shaking, decrease the acoustic energy that tube wall radiates in water, the impact of tube wall radiated noise of largely having decayed；Adopt the water surface being perpendicular in reverberation box by water-filled pipe axis, the mouth of pipe has just been immersed in reverberation box the method for the water surface and has carried out jet noise test, the water surface above for air, bottom is water, belong to absolute soft-sided circle acoustically, and the mouth of pipe is when being immersed in the water surface, the radiation impedance that the radiation impedance of the mouth of pipe is compared when water-filled pipe is totally submerged in water is low, this also reduces the mouth of pipe to the ability of radiative acoustic wave in water, owing to the generation maximum of jet radiated noise is the locus place of orifice plane 8-10 times of nozzle diameter of distance, therefore the mouth of pipe is placed on the water surface, do not cause the loss of jet radiated noise；By installing baffle at mouth of pipe place, the upper surface of baffle has just been immersed under water, cut off when the water in water-filled pipe quickly spurts into the path forming eddy current after water, it is to avoid the impact that jet noise is tested by the eddy current crack of generation.
The water-filled pipe jet noise measuring method of the present invention avoids when free field measures jet noise, and hydrophone can be subject to the impact of jet, produces " pseudo-sound " impact；This measuring method is passed through jet vectoring in fluerics, and the acoustic energy of fluerics is propagated to test section by poly (methyl methacrylate) plate, owing to belonging to hydrostatic in test section, avoids hydrophone well and is subject to the impact that stream impacts；This measuring method is the measurement utilizing hydrophone vertical linear array fixed point to carry out jet radiated noise, do not adopt the method that in reverberation method under water, continuous moving hydrophone carries out space average, avoid hydrophone in test process, flow noise impact that hydrophone connects the motion of cable relative hydrostatic and produces, the background noise of the hydrophone self when this reduces the test of water-filled pipe jet noise；Utilizing reverberation box to measure the jet noise of water-filled pipe in conjunction with reverberation method, workload is more much smaller than the workload that free field measures jet noise, and tests enforcement and be easier to.
Accompanying drawing explanation
Fig. 1 is reverberation box schematic diagram；
Fig. 2 is that water-filled pipe places schematic diagram；
Fig. 3 is vibration damping box profile；
Fig. 4 is vibration damping box top view；
Fig. 5 is mouth of pipe fixture and baffle top view；
Fig. 6 is hydrophone vertical linear array schematic diagram；
Fig. 7 is reverberation box test section point position schematic diagram；
Fig. 8 is the flow chart that water-filled pipe jet noise of the present invention measures the embodiment of system and measuring method.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in further details.
It is an object of the invention to provide the measurement system of a kind of water-filled pipe jet noise and measuring method, it is possible to solve the measurement problem of water-filled pipe jet noise.
The measurement system of a kind of water-filled pipe jet noise and measuring method, including water-filled pipe, reverberation box, poly (methyl methacrylate) plate, hydrophone vertical linear array, described water-filled pipe is arranged on the fluerics in reverberation box, described reverberation box is rectangular structure, without top cover, bottom adopts cross beam support, internal water-filling, outside is air, and reverberation box is divided into two parts by described poly (methyl methacrylate) plate: fluerics and test section；Described hydrophone vertical linear array is placed in the test section of reverberation box, gathers the noise of water-filled pipe jet radiation.
Described water-filled pipe is steel circular configuration.
The twice that fluerics volume is test section volume of described reverberation box, has multiple point position in the test section of reverberation box.
The pipe shaft of described water-filled pipe installs vibration damping box, vibration damping box is double-deck semicolumn shell structure, without top cover, internal filling iron ore, the internal diameter of vibration damping box and the external diameter of water-filled pipe are identical, the outside of vibration damping box, with lug, lug has four bolt holes, difference is pipe thickness ten times of outer, the inside radius of double-deck semicolumn shell；The mouth of pipe of described water-filled pipe installs mouth of pipe fixture, and mouth of pipe fixture is semicircular ring structure, has three bolt holes, and the internal diameter of mouth of pipe fixture and the external diameter of water-filled pipe are identical, and the outside of mouth of pipe fixture, with lug, lug has two bolt holes；Baffle is installed at the mouth of pipe place of described water-filled pipe, baffle is circular ring structure, the diameter of internal ring is identical with the external diameter of water-filled pipe, baffle has screwed hole, it is alignment that the bolt hole center on solid mouth of pipe fixture is stayed close at the center of screwed hole, the thickness of baffle is the twice of pipe thickness, and the external diameter of baffle is three times of mouth of pipe external diameter.
Two vibration damping boxes are enclosed within the pipe shaft of water-filled pipe, the lug of two vibration damping boxes is relative, wear with studs at lug place, nut is utilized to fasten, vibration damping box is just arranged on the pipe shaft of water-filled pipe, inside vibration damping box, fill iron ore, the pipe shaft of water-filled pipe is installed five to vibration damping box, the outer diameter length being spaced apart water-filled pipe between vibration damping box between two；The lug of two mouth of pipe fixtures is relative, to wear with studs at lug place, utilize nut to fasten, mouth of pipe fixture is just arranged on the mouth of pipe place of water-filled pipe, and the distance between mouth of pipe fixture and orifice plane is the thickness of baffle；Baffle is packed into the mouth of pipe, the through hole on screw hole alignment mouth of pipe fixture on baffle, by bolt by the through hole on mouth of pipe fixture, it is threaded in baffle, fastens bolt, make baffle concordant with the mouth of pipe, gap place between baffle and the mouth of pipe is coated with fluid sealant, blocking gap, and utilize paper knife to be struck off by fluid sealant, make laminating between baffle and the mouth of pipe good.
One termination jet source of described water-filled pipe, the other end of water-filled pipe is placed on the center, fluerics of reverberation box, and the axis of water-filled pipe is perpendicular to the water surface in reverberation box, and the mouth of pipe of water-filled pipe and the upper surface of baffle have just been immersed under water.
Described hydrophone vertical linear array is a hydrophone linear array, and hydrophone arranges at equal intervals, and on hydrophone vertical linear array, the hydrophone at two ends can not close to the water surface and water tank bottom, and hydrophone vertical linear array is placed in the test section of reverberation box.
A kind of water-filled pipe jet noise measures system and measuring method, and the step of described measuring method is as follows:
Step S1: water will be full of in described reverberation box, by hydrophone vertical linear array in test section according to the position specified, measure the background noise at point position place, test section, and undertaken the background noise of different measuring points position suing for peace, on average；
Step S2: hang transmitting transducer in the center, fluerics of reverberation box, by hydrophone vertical linear array position according to measuring point in test section, measure the sound source acoustic pressure power spectrum at different spaces point position place, test section, reverberation time, and undertaken the sound source acoustic pressure power spectrum at different spaces point position place and reverberation time suing for peace, on average；
Step S3: after vibration damping box, mouth of pipe fixture and baffle are arranged on water-filled pipe, the mouth of pipe of water-filled pipe and the upper surface of baffle have just been immersed in the water surface, open jet source, making the water in water-filled pipe with in certain speed injection to the fluerics of reverberation box, the water of overflow is derived through the guiding device of reverberation box；
Step S4: by hydrophone vertical linear array position according to measuring point in test section, measures the acoustic pressure power spectrum during submerged jet that water-filled pipe formed respectively, and is undertaken the acoustic pressure power spectrum at different spaces point position place suing for peace, on average；
Step S5: utilize the acoustic pressure power spectrum data under transmitting transducer free-field condition and reverberation time data, obtain the room constant of reverberation box, and the acoustic pressure power spectrum in step S4 is modified, it is possible to obtain the equivalent free field sound pressure level of water-filled pipe submerged jet and the radiated of free field.
The invention discloses the measurement system of a kind of water-filled pipe jet noise and measuring method, including water-filled pipe, reverberation box, poly (methyl methacrylate) plate, hydrophone vertical linear array, described water-filled pipe is placed on the fluerics of reverberation box, described reverberation box is steel rectangular structure, reverberation box is divided into two parts by described poly (methyl methacrylate) plate: fluerics and test section, and described hydrophone vertical linear array is placed on the test section of reverberation box；The measurement system of this water-filled pipe jet noise, reliably eliminates the tube wall radiated noise that water-filled pipe is produced by water impact or water pump vibration etc., the flow noise produced because of hydrophone motion when eliminating space average；The measuring method of this water-filled pipe jet noise, when eliminating free field measurement jet noise, hydrophone is subject to the impact of the impact formation " pseudo-sound " of current, the advantage utilizing reverberation method, decreases free field and measures the workload of water-filled pipe jet noise radiated.
The measurement system of a kind of water-filled pipe jet noise and measuring method, including water-filled pipe, reverberation box, poly (methyl methacrylate) plate, hydrophone vertical linear array, described water-filled pipe is placed on the fluerics of reverberation box, described reverberation box is steel rectangular structure, top uncovered, bottom adopts cross beam support, and not with earth surface, reverberation box is divided into two parts by described poly (methyl methacrylate) plate: fluerics and test section；Described hydrophone vertical linear array is placed on the test section in reverberation box；The axis of water-filled pipe is perpendicular to the upper surface of the water surface in reverberation box, the mouth of pipe and baffle and has just been immersed under water.
The pipe shaft of water-filled pipe installs vibration damping box, and vibration damping box is double-deck semicolumn shell structure, one end uncovered, there is lug at the two ends of double-deck semicolumn shell structure, lug has through hole, adopts studs and nut to be fixed on pipe shaft by vibration damping box, at the internal filling iron ore of vibration damping box.
The mouth of pipe of water-filled pipe installs mouth of pipe fixture, and mouth of pipe fixture is semicircular ring structure, has bolt hole.
The mouth of pipe of water-filled pipe installs baffle, and baffle has screw hole, aligns with the bolt hole center in the mouth of pipe fixture of fastening in screw hole center, adopts studs and nut to be fastened on mouth of pipe fixture by baffle.The outer surface of baffle and the mouth of pipe of water-filled pipe are generally flush with.
The internal diameter of vibration damping box and the external diameter of water-filled pipe are identical, and the internal diameter of mouth of pipe fixture and the external diameter of water-filled pipe are identical, and the internal diameter of baffle and the external diameter of water-filled pipe are identical.Difference is pipe thickness ten times of outer, the internal diameter of vibration damping box, the thickness of baffle is the twice of pipe thickness, and the external diameter of baffle is three times of pipe external diameter.
Described hydrophone vertical linear array is made up of through the hydrophone of calibration amplitude and phase place, and measuring method comprises the following steps:
Step S1: by water-filling in described reverberation box, measures the background noise at point position place of reverberation box build-in test district by hydrophone vertical linear array, and is undertaken the background noise of different measuring points position suing for peace, on average；
Step S2: the center of fluerics hangs transmitting transducer in reverberation box, measured the acoustic pressure power spectrum at point position place of reverberation box build-in test district, reverberation time by hydrophone vertical linear array, and to the acoustic pressure power spectrum of different measuring points position and the reverberation time sues for peace, on average；
Step S3: after water-filled pipe is installed vibration damping box, mouth of pipe fixture and baffle, the mouth of pipe of water-filled pipe is placed near the water surface, making the water in water-filled pipe with in certain speed injection to the fluerics of reverberation box, the water of overflow is derived by the guiding device of reverberation box；
Step S4: measured the acoustic pressure power spectrum of the submerged jet noise of the water-filled pipe formation at point position place by hydrophone vertical linear array in reverberation box；
Step S5: utilize the room constant of the transmitting transducer acoustic pressure power spectrum data in free field and reverberation time data calculating reverberation box, acoustic pressure power spectrum in S4 step is modified, then obtains the equivalent free field sound pressure level of water-filled pipe submerged jet noise and the radiated of free field；
In step S1, S2 and S4, also include:
Described hydrophone vertical linear array, in test process, moves in test section according to test point position, postpones when moving to specific bit, carries out test and measures, it is desirable to step S2 keeps consistent with the hydrophone vertical linear array placement in step S4.
As shown in Fig. 1～Fig. 7, the measurement system of a kind of water-filled pipe jet noise and measuring method, including reverberation box 1, poly (methyl methacrylate) plate 2, water-filled pipe 3, hydrophone vertical linear array 4, described reverberation box 1 is made up of steel plate, structure is cuboid, top uncovered, described poly (methyl methacrylate) plate 2 is inserted into the inside of reverberation box 1, the pipe shaft of described water-filled pipe 3 is provided with five pairs of vibration damping boxes 31, being provided with mouth of pipe fixture 32 and baffle 33 on the mouth of pipe of water-filled pipe 3, described hydrophone vertical linear array 4 is made up of eight hydrophone 41.
Described reverberation box 1 is of a size of long 9m, wide 3.6m, high 1.7m, tank thickness 1cm, has overflow launder on the top of reverberation box 1, and the bottom of reverberation box 1 adopts cross beam support, and internal water-filling, outside is air.
Described poly (methyl methacrylate) plate 2 is of a size of long 3.58m, wide 1.7m, thickness 2cm, poly (methyl methacrylate) plate 2 is inserted in reverberation box 1, in the place that the edge of poly (methyl methacrylate) plate 2 connects with reverberation box 1, glass cement is adopted to carry out embedding, caulking joint, and utilizing paper knife to be wiped off by the burr of glass cement, reverberation box 1 is divided into fluerics and test section by poly (methyl methacrylate) plate 2, and the volume of fluerics is about the twice of test section volume.
Described water-filled pipe 3 is steel circular pipe, internal water-filling, and the internal diameter of pipe is 88mm, and the external diameter of pipe is 108mm, and length is 2m, and a termination jet source of water-filled pipe 3, the other end is placed in reverberation box 1；nullThe pipe shaft of water-filled pipe 3 is installed vibration damping box 31，Vibration damping box 31 is processed into by iron sheet，Double-deck semicolumn shell structure，Without top cover，Lug is had at the two ends of semicolumn shell，Lug has four through holes，The long 200mm of vibration damping box 31，Internal diameter is 108mm，Thickness of shell is 3mm，Radial distance between inner surface and the outer surface of shell of inner shell is 106mm，The inner side of two vibration damping boxes 31 is attached on the pipe shaft of water-filled pipe 3，Lug is relative，Four through holes on alignment lug，Studs and nut 34 is utilized to fasten，Vibration damping box 31 is made tightly to be fitted on water-filled pipe 3，Filling iron ore in vibration damping box 31，Iron ore surface after filling up is concordant with the top of vibration damping box 31，Water-filled pipe 3 is installed five altogether to vibration damping box 31，It is spaced apart 100mm between two vibration damping boxes 31，Formed by the lug of line and other vibration damping box 31 formed by the lug of two vibration damping boxes 31, between line, angle is 72 degree，Namely the lug of vibration damping box 31 is staggered；Mouth of pipe place at water-filled pipe 3, mouth of pipe fixture 32 is installed, mouth of pipe fixture 32 is semicircular ring structure, thickness is 20mm, internal diameter is 108mm, external diameter is 208mm, namely in, the radial distance of outer toroid is 100mm, lug is had at the two ends of mouth of pipe fixture 32, lug has through hole, mouth of pipe fixture 32 has through hole, align with the screwed hole center on baffle 33 in through hole center on the mouth of pipe fixture 32 of fastening, two mouth of pipe fixtures 32 are attached near the mouth of pipe of water-filled pipe 3, the thickness that distance is baffle 33 of the plane separation orifice plane of mouth of pipe fixture 32, by relative for the lug of mouth of pipe fixture 32, studs and nut 35 is utilized to fasten, mouth of pipe fixture 32 is made to be close to the mouth of pipe place of water-filled pipe 3；Baffle 33 is installed at the mouth of pipe place of water-filled pipe 3, baffle 33 is circular ring structure, thickness is 20mm, internal diameter is 108mm, external diameter is 324mm, baffle 33 has screwed hole, the position of screwed hole is mated with the lead to the hole site on mouth of pipe fixture 32, baffle 33 is placed near the mouth of pipe of water-filled pipe 3, utilize bolt 36 by after the through hole on mouth of pipe fixture 32, baffle 33 is fastened on mouth of pipe fixture 32, now the plane of the lower surface of baffle 33 and water-filled pipe 3 mouth of pipe is generally flush with, gap between the mouth of pipe of baffle 33 and water-filled pipe 3, it is coated with fluid sealant (model: 704), then paper knife is utilized to strike off, make between the mouth of pipe of baffle 33 and water-filled pipe 3 seamless.
The iron ore of filling in described vibration damping box 31, particle size range is between 0.2mm-2mm.
Described hydrophone vertical linear array 4 is made up of eight hydrophone 41, hydrophone is 8103 models of B&K company, utilize coupler reciprocity calibration method that amplitude and the phase place of hydrophone 41 are carried out concordance calibration, the total length of hydrophone vertical linear array 4 is 1.4m, hydrophone 41 arranges at equal intervals according to the spacing of 0.2m, hydrophone 41 adopts nylon cable tie to be fixed on the rope of excellent elasticity of a softness, the bottom of rope hangs a lead, rope is stretched by the weight utilizing lead, the cable of each hydrophone 41 is both needed to utilize nylon cable tie to tighten on rope according to the interval of 0.1m；Position in the hydrophone vertical linear array 4 reverberation box shown in Fig. 8 is placed；Another termination data collection and analysis equipment (the present embodiment is not shown) of hydrophone vertical linear array 4.
Reverberation box build-in test head of district 3.6m, wide 3m, high 1.7m, as shown in Figure 8, in test section, the air line distance between hydrophone vertical linear array distance casing wall and poly (methyl methacrylate) plate is 1m, longitudinally chooses five equidistant measuring points, measuring point spacing is 0.4m, width chooses four equidistant measuring points, and measuring point spacing is 0.33m, amounts to 20 measuring points in such reverberation box.
In Fig. 1～Fig. 7,1 is reverberation box, and 2 is poly (methyl methacrylate) plate, and 3 is water-filled pipe, and 31 is vibration damping box, and 32 is mouth of pipe fixture, and 33 is baffle, and 34 is studs and nut, and 35 is studs and nut, and 36 is bolt, and 4 is hydrophone vertical linear array, and 41 is hydrophone.
As shown in Figure 8, a kind of water-filled pipe jet noise measures system and measuring method, and the step of described measuring method is as follows:
Step S1: be full of water in described reverberation box 1, by hydrophone vertical linear array 4 point position shown in Fig. 7 in test section, measure the background noise at different spaces point position place, test section, and undertaken the background noise at different spaces point position place suing for peace, on average；
Step S2: hang transmitting transducer in the center, fluerics of reverberation box 1, by hydrophone vertical linear array 4 point position shown in Fig. 7 in the test section of reverberation box 1, measure the sound source acoustic pressure power spectrum at different spaces point position place, test section, reverberation time, and undertaken the sound source acoustic pressure power spectrum at different spaces point position place and reverberation time suing for peace, on average；
Step S3: after vibration damping box 31, mouth of pipe fixture 32 and baffle 33 are arranged on water-filled pipe 3, the mouth of pipe of water-filled pipe 3 and the upper surface of baffle 33 have just been immersed in the water surface, open jet source, making the water in water-filled pipe 3 with in certain speed injection to the fluerics of reverberation box 1, the water of overflow is derived through the guiding device of reverberation box 1；
Step S4: by hydrophone vertical linear array 4 point position shown in Fig. 7 in the test section of reverberation box 1, measures the acoustic pressure power spectrum during submerged jet that water-filled pipe 3 formed, and is undertaken the acoustic pressure power spectrum at different spaces point position place suing for peace, on average；
Step S5: utilize the acoustic pressure power spectrum data under transmitting transducer free-field condition and reverberation time data, obtain the room constant of reverberation box 1, and the acoustic pressure power spectrum in step S4 is modified, it is possible to obtain free field equivalent sound pressure level and the radiated of water-filled pipe 3 submerged jet.
The present invention utilizes the jet noise that the water-filling reverberation box 1 being placed in air carries out water-filled pipe 3 to measure, and utilizes the sound reflecting that tank wall is good, the jet of water-filled pipe 3 is radiated acoustic energy and is stored in well in reverberation box 1；Utilize poly (methyl methacrylate) plate 2 that reverberation box 1 is divided into fluerics and test section, owing to the characteristic impedance of poly (methyl methacrylate) plate 2 is close with water, jet acoustic energy in fluerics can be propagated well to test section, and the hydrophone of test section is among hydrostatic, not by the water currents caused by jet；Vibration damping box 31 is utilized to reduce the vibration of water-filled pipe 3 tube wall well；Water-filled pipe 3 is placed on the water surface site place of fluerics in reverberation box 1, utilizes the absolute soft-sided circle acoustic condition of the water surface, reduce the acoustic radiation ability of the mouth of pipe；Mouth of pipe fixture 32 and baffle 33 is utilized to eliminate the eddy current crack impact produced because of mouth of pipe water impact；The method utilizing the mobile hydrophone vertical linear array 4 of fixed point removes to gather the jet noise of water-filled pipe 3, eliminate the hydrophone utilizing space constantly to move in reverberation method under water when removing to carry out space average, hydrophone and hydrophone cables are in running, because of the low frequency noises that shake causes, and because of the kinetic flow noise interference of relative hydrostatic in running；Utilizing reverberation method to measure the jet noise of water-filled pipe, test enforcement is easier to, and decreases the workload of measurement.
Claims (7)
1. the measurement system of a water-filled pipe jet noise, it is characterised in that: include water-filled pipe, reverberation box, poly (methyl methacrylate) plate and hydrophone vertical linear array；
Reverberation box is steel rectangular structure, internal water-filling, and top uncovered, bottom adopts cross beam support；Poly (methyl methacrylate) plate is arranged on inside reverberation box, and reverberation box is divided into two parts: fluerics and test section；Water-filled pipe is placed on the fluerics of reverberation box；Hydrophone vertical linear array is placed on the test section in reverberation box.
2. the measurement system of a kind of water-filled pipe jet noise according to claim 1, it is characterized in that: the pipe shaft of described water-filled pipe installs N to vibration damping box, vibration damping box is double-deck semicolumn shell structure, without top cover, the internal diameter of vibration damping box and the external diameter of water-filled pipe are identical, and there is lug at the two ends of double-deck semicolumn shell structure, lug has through hole, the lug of every pair of vibration damping box is relative, connects at lug place, the internal filling iron ore of vibration damping box.
3. the measurement system of a kind of water-filled pipe jet noise according to claim 1, it is characterized in that: the mouth of pipe of described water-filled pipe is provided with a line up fixture, mouth of pipe fixture is semicircular ring structure, the internal diameter of mouth of pipe fixture and the external diameter of water-filled pipe are identical, the outside of mouth of pipe fixture is with lug, having through hole, the lug of two mouth of pipe fixtures is relative, connects at lug place.
4. the measurement system of a kind of water-filled pipe jet noise according to claim 1, it is characterised in that: the mouth of pipe of described water-filled pipe is provided with baffle, and baffle is connected with mouth of pipe fixture；The internal diameter of baffle and the external diameter of water-filled pipe are identical, and the lower surface of baffle and the mouth of pipe of water-filled pipe are generally flush with.
5. the measurement system of a kind of water-filled pipe jet noise according to claim 1, it is characterized in that: a termination jet source of described water-filled pipe, the other end of water-filled pipe is placed on the center, fluerics of reverberation box, the axis of water-filled pipe is perpendicular to the water surface in reverberation box, and the mouth of pipe of water-filled pipe and the upper surface of baffle are immersed under water.
6. the measurement system of a kind of water-filled pipe jet noise according to claim 4, it is characterised in that: the external diameter of described baffle is three times of pipe external diameter.
7. the measuring method based on the measurement system of the water-filled pipe jet noise described in claim 1, it is characterised in that: comprise the following steps,
Step one: by water-filling in reverberation box, measures the background noise at point position place of reverberation box build-in test district by hydrophone vertical linear array, and is undertaken the background noise of different measuring points position suing for peace, on average；
Step 2: the center of fluerics hangs transmitting transducer in reverberation box, measured the acoustic pressure power spectrum at point position place of reverberation box build-in test district, reverberation time by hydrophone vertical linear array, and to the acoustic pressure power spectrum of different measuring points position and the reverberation time sues for peace, on average；
Step 3: after water-filled pipe is installed vibration damping box, mouth of pipe fixture and baffle, the mouth of pipe of water-filled pipe is placed near the water surface so that the water in water-filled pipe is with in speed K injection to the fluerics of reverberation box, and the water of overflow is derived by the guiding device of reverberation box；
Step 4: measured the acoustic pressure power spectrum of the submerged jet noise of the water-filled pipe formation at point position place by hydrophone vertical linear array in reverberation box；
Step 5: utilize the room constant of the transmitting transducer acoustic pressure power spectrum data in free field and reverberation time data calculating reverberation box, acoustic pressure power spectrum in S4 step is modified, then obtains the equivalent free field sound pressure level of water-filled pipe submerged jet noise and the radiated of free field.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN108917907A (en) * | 2018-05-17 | 2018-11-30 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | The conversion method of characteristics of ship underwater radiation noise test result in different water environments |
| CN109141617A (en) * | 2018-08-02 | 2019-01-04 | 哈尔滨工程大学 | A kind of device and method for measuring model stream in the active section of water hole and swashing noise |
| CN109959444A (en) * | 2017-12-26 | 2019-07-02 | 中国人民解放军海军工程大学 | Transmitting tube outlet transient state water-jet flow noise totally disappeared sound pond test macro and method |
| CN110160637A (en) * | 2018-05-18 | 2019-08-23 | 李文杰 | Acoustic power level cylindrical measurement face method detects the method that ceramic pedestal pan rinses noise |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0394755A (en) * | 1989-09-08 | 1991-04-19 | Matsushita Electric Ind Co Ltd | Bubble exhausting device |
| JPH0659298B2 (en) * | 1989-08-02 | 1994-08-10 | 松下電器産業株式会社 | Bubble ejector |
| CN104132727A (en) * | 2014-06-23 | 2014-11-05 | 中国建筑设计研究院 | Drainpipe noise test system and test method for high-rise/ultra-high-rise building |
| CN104501938A (en) * | 2014-11-19 | 2015-04-08 | 哈尔滨工程大学 | Method for measuring underwater sound source low frequency radiation sound power in rectangular reverberation water tank arranged in air |
| CN105318965A (en) * | 2015-12-03 | 2016-02-10 | 哈尔滨工程大学 | Flow guide device used for measuring underwater jet flow noises by reverberation method |
-
2016
- 2016-03-09 CN CN201610130813.1A patent/CN105784096B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0659298B2 (en) * | 1989-08-02 | 1994-08-10 | 松下電器産業株式会社 | Bubble ejector |
| JPH0394755A (en) * | 1989-09-08 | 1991-04-19 | Matsushita Electric Ind Co Ltd | Bubble exhausting device |
| CN104132727A (en) * | 2014-06-23 | 2014-11-05 | 中国建筑设计研究院 | Drainpipe noise test system and test method for high-rise/ultra-high-rise building |
| CN104501938A (en) * | 2014-11-19 | 2015-04-08 | 哈尔滨工程大学 | Method for measuring underwater sound source low frequency radiation sound power in rectangular reverberation water tank arranged in air |
| CN105318965A (en) * | 2015-12-03 | 2016-02-10 | 哈尔滨工程大学 | Flow guide device used for measuring underwater jet flow noises by reverberation method |
Non-Patent Citations (4)
| Title |
|---|
| 刘永伟 等: ""水下射流噪声数值计算与试验研究"", 《南京大学学报》 * |
| 尚大晶 等: ""水下声源辐射声功率测量实验研究"", 《哈尔滨工程大学学报》 * |
| 王春旭 等: ""水下湍射流噪声试验研究"", 《船舶力学》 * |
| 王曼 等: ""充液管路噪声辐射控制研究"", 《应用声学》 * |
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