CN105784096B - A kind of measuring system and measurement method of water-filled pipe jet noise - Google Patents
A kind of measuring system and measurement method of water-filled pipe jet noise Download PDFInfo
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- CN105784096B CN105784096B CN201610130813.1A CN201610130813A CN105784096B CN 105784096 B CN105784096 B CN 105784096B CN 201610130813 A CN201610130813 A CN 201610130813A CN 105784096 B CN105784096 B CN 105784096B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H3/00—Measuring characteristics of vibrations by using a detector in a fluid
Abstract
The invention discloses a kind of measuring systems and measurement method 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 parallelepiped structure, and internal water-filling, top uncovered, bottom uses cross beam support；Poly (methyl methacrylate) plate is mounted 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 present invention reliably eliminates the tube wall radiated noise that water-filled pipe is vibrated etc. generations by water impact or water pump, the flow noise generated when eliminating space average because hydrophone moves；The measurement method of water-filled pipe jet noise, when eliminating free field measurement jet noise, hydrophone is formed " pseudo- sound " by the impact of flow to be influenced；The advantages of using reverberation method, reduces the workload of free field measurement water-filled pipe jet noise radiated.
Description
Technical field
The invention belongs to the measuring systems and measurement side of acoustic measurement field more particularly to a kind of water-filled pipe jet noise
Method.
Background technology
Submerged jet noise is usually to be sprayed from nozzle with certain flow velocity by being immersed in the water in the water-filled pipe in water,
It is blended because of the flow quickly sprayed and drastically between hydrostatic, the two interacts and the radiated noise of generation.Jet noise (non-empty
Change) magnitude it is typically small, it is easy to flooded by the radiated noise of tube wall vibration, if utilizing continuous moving hydrophone in reverberation method
When progress space average removes acquisition jet noise, then the low speed flow noise that generation is continuously moved by hydrophone makes an uproar blending in jet stream
In sound, this is very unfavorable to the experimental study of submerged jet noise.Patent (104132727 A of CN) --- it is a kind of it is high-rise/
High-rise building drainage pipeline noise measuring system and test method and patent (101368845 A of CN) --- drainage pipeline noise
Sensing chamber and its detection method, what is all referred to is the aerial radiated noise test of drainage pipeline；Wang Man (see applied acoustics,
2003(1)：Charging line sound radiation control research 35-38) carried out only places hydrophone sound intensity battle array to comment in nozzle
The acoustical behavior of valence muffler is quickly sprayed without reference to the flow of water-filled pipe to the survey of generated jet noise in hydrostatic
Amount system and measurement method.
Invention content
The object of the present invention is to provide a kind of simple in structure, measurement systems of the good water-filled pipe jet noise of measurement effect
System.The purpose of the present invention further includes providing a kind of measurement method of accurate and effective water-filled pipe jet noise.
A kind of measuring system 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 parallelepiped structure, and internal water-filling, top uncovered, bottom uses cross beam support；Poly (methyl methacrylate) plate
Inside reverberation box, reverberation box is divided into two parts：Fluerics and test section；Water-filled pipe is placed on penetrating for reverberation box
Flow area；Hydrophone vertical linear array is placed on the test section in reverberation box.
A kind of measuring system of water-filled pipe jet noise can also include：
1, the pipe shaft of water-filled pipe installs N to vibration damping box, and vibration damping box is the double-deck semicircle pole-shell structure, no head cover, vibration damping box
Internal diameter and the outer diameter of water-filled pipe be identical, there is lug at the both ends of the double-deck semicircle pole-shell structure, there is through-hole on lug, each pair of
The lug of vibration damping box is opposite, is connected at lug, and iron sand is filled inside vibration damping box.
2, the nozzle of water-filled pipe is equipped with a pair of of nozzle fixture, and nozzle fixture is semicircle ring structure, nozzle fixture it is interior
The outer diameter of diameter and water-filled pipe is identical, and the outside of nozzle fixture carries lug, is provided with through-hole, the lug of two nozzle fixtures
Relatively, it is connected at lug.
3, the nozzle of water-filled pipe is equipped with baffle, and baffle is connect with nozzle fixture；The internal diameter of baffle and water-filled pipe
Outer diameter be it is identical, what the lower surface of baffle and the nozzle of water-filled pipe were generally flush with.
4, a termination jet source of water-filled pipe, the other end of water-filled pipe are placed on the jet stream district center of reverberation box, fill
The water surface of the axis of waterpipe in reverberation box, the nozzle of water-filled pipe and the upper surface of baffle are immersed under water.
5, the outer diameter of baffle is three times of pipe outside diameter.
A kind of measurement method of water-filled pipe jet noise, includes the following steps,
Step 1：By water-filling in reverberation box, measured in reverberation box at the point position of test section by hydrophone vertical linear array
Ambient noise, and the ambient noise at different measuring points position summed, is average；
Step 2：The center of fluerics hangs transmitting transducer in reverberation box, is measured by hydrophone vertical linear array mixed
Ring acoustic pressure power spectrum in case at the point position of test section, reverberation time, and at different measuring points position acoustic pressure power spectrum and
Reverberation time is summed, is average；
Step 3：After water-filled pipe is installed vibration damping box, nozzle fixture and baffle, the nozzle of water-filled pipe is placed on the water surface
Near so that the water in water-filled pipe is sprayed with speed K to the fluerics of reverberation box, the water conservancy diversion that the water of overflow passes through reverberation box
Device exports；
Step 4：The underwater of water-filled pipe formation at point position is measured by hydrophone vertical linear array in reverberation box to penetrate
The acoustic pressure power spectrum of flow noise；
Step 5：Acoustic pressure power spectrum data and reverberation time data using transmitting transducer in free field calculate reverberation box
Room constant, the acoustic pressure power spectrum in S4 steps is modified, then obtain water-filled pipe submerged jet noise it is equivalent from
By the radiated of field sound pressure level and free field.
Advantageous effect：
Usefulness of the present invention is to carry out the examination of water-filled pipe jet noise as reverberation box using case made of steel plate
Test tries, and due to water-filling inside reverberation box, outside is air, and the characteristic impedance of tank wall is more much larger than the characteristic impedance of air (close
80000 times), the sound wave that jet noise is radiated tank wall can be well back in reverberation box, and acoustical energy losses very little is (about
One thousandth), by the room constant for calibrating reverberation box, it will be able to obtain the equivalent free field acoustic pressure of water-filled pipe jet noise
The radiated of grade and free field；Using on the pipe shaft of water-filled pipe install vibration damping box carry out vibration suppression, reduce tube wall to
The acoustic energy radiated in water, the influence for tube wall radiated noise of largely having decayed；Using by water-filled pipe axis perpendicular to mixed
The water surface in case is rung, the method that nozzle has just been immersed in the water surface in reverberation box carries out jet noise test, and the upper surface of water surface is air,
Lower part is water, belongs to absolute soft-sided circle acoustically, and when nozzle is immersed in the water surface, and the radiation impedance of nozzle compares charging pipe
Radiation impedance when road is totally submerged in water is low, this also reduces the ability of nozzle radiative acoustic wave into water, due to jet stream spoke
The generation maximum for penetrating noise is to be placed on water at the spatial position of 8-10 times of nozzle diameter of orifice plane, therefore by nozzle
Face does not cause the loss of jet stream radiated noise；By installing baffle at nozzle, the upper surface of baffle has just been immersed under water,
The path for forming vortex after the water in water-filled pipe quickly spurts into water has been cut off, has avoided the eddy current crack of generation to jet stream
The influence of noise testing.
The water-filled pipe jet noise measurement method of the present invention is avoided in free field measurement jet noise, hydrophone meeting
It is impacted by jet stream, generating " pseudo- sound " influences；The measurement method is by the way that by jet vectoring, in fluerics, the acoustic energy of fluerics is logical
It crosses poly (methyl methacrylate) plate and propagates to test section, due to belonging to hydrostatic in test section, avoid hydrophone well by stream impact
It influences；The measurement method is that the measurement for carrying out jet stream radiated noise is pinpointed using hydrophone vertical linear array, not using underwater mixed
The method that continuous moving hydrophone carries out space average in the method for sound, avoids hydrophone in test process, hydrophone connection cables
The flow noise for moving and generating with respect to hydrostatic influences, the hydrophone itself when being tested this reduces water-filled pipe jet noise
Ambient noise；The jet noise of water-filled pipe is measured using reverberation box combination reverberation method, workload is made an uproar than free field measurement jet stream
The workload of sound is much smaller, and tests and implement to be easier.
Description of the drawings
Fig. 1 is reverberation box schematic diagram；
Fig. 2 is that water-filled pipe places schematic diagram；
Fig. 3 is vibration damping box sectional view；
Fig. 4 is vibration damping box vertical view；
Fig. 5 is nozzle fixture and baffle vertical 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 of the embodiment of water-filled pipe jet noise measuring system of the present invention and measurement method.
Specific implementation mode
The present invention is described in further details below in conjunction with attached drawing.
The object of the present invention is to provide a kind of measuring systems and measurement method of water-filled pipe jet noise, can solve to fill
The measurement problem of waterpipe jet noise.
A kind of measuring system and measurement method of water-filled pipe jet noise, including water-filled pipe, reverberation box, organic glass
Plate, hydrophone vertical linear array, the water-filled pipe are mounted on the fluerics in reverberation box, and the reverberation box is rectangular parallelepiped structure,
Without head cover, it is air that bottom, which uses cross beam support, internal water-filling, outside, and reverberation box is divided into two by the poly (methyl methacrylate) plate
Point：Fluerics and test section；The hydrophone vertical linear array is placed in the test section of reverberation box, acquires water-filled pipe jet stream spoke
The noise penetrated.
The water-filled pipe is steel circular configuration.
The fluerics volume of the reverberation box is twice of test section volume, there is multiple measuring points in the test section of reverberation box
Position.
The pipe shaft of the water-filled pipe installs vibration damping box, and vibration damping box is the double-deck semicircle pole-shell structure, no head cover, inside filling
Iron sand, the internal diameter of vibration damping box and the outer diameter of water-filled pipe are identical, and the outside of vibration damping box carries lug, opened on lug there are four
Bolt hole, the outer of the double-deck semicolumn shell, inside radius difference be ten times of pipe thickness；The nozzle installing pipe of the water-filled pipe
Mouthful fixture, nozzle fixture are semicircle ring structure, open that there are three bolt holes, and the internal diameter of nozzle fixture and the outer diameter of water-filled pipe are
Identical, the outside of nozzle fixture carries lug, opens that there are two bolt holes on lug；It is installed at the nozzle of the water-filled pipe
Baffle, baffle are circular ring structure, and the diameter of inner ring is identical with the outer diameter of water-filled pipe, and threaded hole, screw thread are provided on baffle
The center in hole is alignment with the bolt hole center on the nozzle fixture of fastening, and the thickness of baffle is twice of pipe thickness,
The outer diameter of baffle is three times of nozzle outer diameter.
Two vibration damping boxes are sleeved on the pipe shaft of water-filled pipe, the lug of two vibration damping boxes is opposite, is worn with double at lug
Header stud is fastened using nut, and vibration damping box is just mounted on the pipe shaft of water-filled pipe, and iron sand is filled inside vibration damping box,
Five pairs of vibration damping boxes are installed on the pipe shaft of water-filled pipe, two-by-two between vibration damping box between be divided into the outer diameter length of water-filled pipe；By two
The lug of a nozzle fixture is opposite, is worn at lug with studs, is fastened using nut, and nozzle fixture, which is just mounted on, to be filled
At the nozzle of waterpipe, the distance between nozzle fixture and orifice plane are the thickness of baffle；Baffle is packed into nozzle, on baffle
Screw hole alignment nozzle fixture on through-hole be threaded into baffle by bolt by the through-hole on nozzle fixture, fasten spiral shell
Bolt keeps baffle concordant with nozzle, and fluid sealant is coated at the gap between baffle and nozzle, blocks gap, and utilize paper knife
Fluid sealant is struck off, good fit between baffle and nozzle is made.
One termination jet source of the water-filled pipe, the other end of water-filled pipe are placed on the jet stream district center of reverberation box,
The water surface of the axis of water-filled pipe in reverberation box, the nozzle of water-filled pipe and the upper surface of baffle are just immersed in water
Under.
The hydrophone vertical linear array is a hydrophone linear array, hydrophone arranged at equal intervals, on hydrophone vertical linear array
The hydrophone at both ends cannot be placed on close to the water surface and water tank bottom, hydrophone vertical linear array in the test section of reverberation box.
The step of a kind of water-filled pipe jet noise measuring system and measurement method, the measurement method, is as follows：
Step S1：Water will be full of in the reverberation box, by hydrophone vertical linear array according to specified position in test section
It sets, measures the ambient noise at the point position of test section, and the ambient noise at different measuring points position is summed, is average；
Step S2：Transmitting transducer is hung at the jet stream district center of reverberation box, is being tested by hydrophone vertical linear array
According to the position of measuring point in area, sound source acoustic pressure power spectrum at the different spaces point position of test section, reverberation time are measured, and will
Sound source acoustic pressure power spectrum and reverberation time at different spaces point position are summed, are average；
Step S3：After vibration damping box, nozzle fixture and baffle are mounted on water-filled pipe, the nozzle of water-filled pipe and baffle
Upper surface is just immersed in the water surface, opens jet source so that the water in water-filled pipe is sprayed with certain speed to reverberation box
In fluerics, the guiding device export of the water of overflow Jing Guo reverberation box；
Step S4：Water-filled pipe shape is measured respectively according to the position of measuring point in test section by hydrophone vertical linear array
At submerged jet when acoustic pressure power spectrum, and the acoustic pressure power spectrum at different spaces point position summed, is average；
Step S5：Using the acoustic pressure power spectrum data and reverberation time data under transmitting transducer free-field condition, obtain
The room constant of reverberation box, and the acoustic pressure power spectrum in step S4 is modified, so that it may to obtain water-filled pipe submerged jet
Equivalent free field sound pressure level and free field radiated.
The invention discloses a kind of measuring system and measurement method of water-filled pipe jet noise, including it is water-filled pipe, mixed
Case, poly (methyl methacrylate) plate, hydrophone vertical linear array are rung, the water-filled pipe is placed on the fluerics of reverberation box, and the reverberation box is
Reverberation box is divided into two parts by steel rectangular parallelepiped structure, the poly (methyl methacrylate) plate：Fluerics and test section, the hydrophone hang down
Line array is placed on the test section of reverberation box；The measuring system of the water-filled pipe jet noise, reliably eliminates water-filled pipe
Tube wall radiated noise that generations are vibrated etc. by water impact or water pump generates when eliminating space average because hydrophone moves
Flow noise；The measurement method of the water-filled pipe jet noise, when eliminating free field measurement jet noise, hydrophone is by flow
Impact form the influence of " pseudo- sound ", the advantages of using reverberation method, reduce free field measurement water-filled pipe jet noise radiation
The workload of acoustical power.
A kind of measuring system and measurement method of water-filled pipe jet noise, including water-filled pipe, reverberation box, organic glass
Plate, hydrophone vertical linear array, the water-filled pipe are placed on the fluerics of reverberation box, and the reverberation box is steel cuboid knot
Structure, top uncovered, bottom use cross beam support, are not contacted with ground, reverberation box is divided into two parts by the poly (methyl methacrylate) plate：
Fluerics and test section；The hydrophone vertical linear array is placed on the test section in reverberation box；The axis of water-filled pipe perpendicular to
The upper surface of the water surface in reverberation box, nozzle and baffle has just been immersed under water.
The pipe shaft of water-filled pipe installs vibration damping box, and vibration damping box is the double-deck semicircle pole-shell structure, one end uncovered, the double-deck semicolumn
There is lug at the both ends of shell structure, have through-hole on lug, vibration damping box is fixed on pipe shaft using studs and nut, in vibration damping
Iron sand is filled inside case.
The nozzle of water-filled pipe installs nozzle fixture, and nozzle fixture is semicircle ring structure, is provided with bolt hole.
The nozzle of water-filled pipe installs baffle, is provided with screw hole on baffle, in the nozzle fixture of screw hole center and fastening
Bolt hole center be alignment, baffle is fastened on nozzle fixture using studs and nut.The outer surface of baffle
It is generally flush with the nozzle of water-filled pipe.
The internal diameter of vibration damping box and the outer diameter of water-filled pipe are identical, and the internal diameter of nozzle fixture and the outer diameter of water-filled pipe are
Identical, the internal diameter of baffle and the outer diameter of water-filled pipe are identical.The outer of vibration damping box, internal diameter difference be the ten of pipe thickness
Times, the thickness of baffle is twice of pipe thickness, and the outer diameter of baffle is three times of pipe outside diameter.
Hydrophone of the hydrophone vertical linear array by amplitude and phase by calibration forms, and measurement method includes following
Step：
Step S1：By water-filling in the reverberation box, test section measuring point position in reverberation box is measured by hydrophone vertical linear array
The ambient noise at place is set, and the ambient noise at different measuring points position is summed, is average；
Step S2：The center of fluerics hangs transmitting transducer in reverberation box, is measured by hydrophone vertical linear array mixed
Ring acoustic pressure power spectrum in case at the point position of test section, reverberation time, and at different measuring points position acoustic pressure power spectrum and
Reverberation time is summed, is average；
Step S3：After water-filled pipe is installed vibration damping box, nozzle fixture and baffle, the nozzle of water-filled pipe is placed on the water surface
Near so that the water in water-filled pipe is sprayed with certain speed to the fluerics of reverberation box, and the water of overflow passes through reverberation box
Guiding device export；
Step S4：The underwater of water-filled pipe formation at point position is measured by hydrophone vertical linear array in reverberation box to penetrate
The acoustic pressure power spectrum of flow noise；
Step S5：Acoustic pressure power spectrum data and reverberation time data using transmitting transducer in free field calculate reverberation box
Room constant, the acoustic pressure power spectrum in S4 steps is modified, then obtain water-filled pipe submerged jet noise it is equivalent from
By the radiated of field sound pressure level and free field；
Step S1, in S2 and S4, further include：
The hydrophone vertical linear array is moved in test section according to test point position during the test, works as shifting
It moves to after designated position, carries out test measurement, it is desirable that the hydrophone vertical linear array placement in step S2 and step S4 is kept
Unanimously.
As shown in Fig. 1~Fig. 7, a kind of measuring system and measurement method of water-filled pipe jet noise, including reverberation box 1,
Poly (methyl methacrylate) plate 2, water-filled pipe 3, hydrophone vertical linear array 4, the reverberation box 1 are made of steel plate, and structure is cuboid, top
Uncovered, the poly (methyl methacrylate) plate 2 are inserted into the inside of reverberation box 1, and five pairs of vibration damping boxes are equipped on the pipe shaft of the water-filled pipe 3
31, nozzle fixture 32 and baffle 33 are installed on the nozzle of water-filled pipe 3, the hydrophone vertical linear array 4 is listened by eight water
Device 41 forms.
The size of the reverberation box 1 is long 9m, width 3.6m, high 1.7m, tank thickness 1cm, is had on the top of reverberation box 1 excessive
Chute, it is air that the bottom of reverberation box 1, which uses cross beam support, internal water-filling, outside,.
The size of the poly (methyl methacrylate) plate 2 is long 3.58m, width 1.7m, thickness 2cm, and poly (methyl methacrylate) plate 2 is inserted into reverberation
It in case 1, in the place that the edge of poly (methyl methacrylate) plate 2 connects with reverberation box 1, is potted using glass cement, caulking joint, and utilizes sanction
Paper knife wipes the burr of glass cement off, and reverberation box 1 is divided into fluerics and test section, the volume of fluerics by poly (methyl methacrylate) plate 2
About twice of test section volume.
The water-filled pipe 3 is steel circular pipe, and the internal diameter of internal water-filling, pipe is 88mm, and the outer diameter of pipe is 108mm,
Length is 2m, and the one of water-filled pipe 3 terminates jet source, and the other end is placed in reverberation box 1；Pacify on the pipe shaft of water-filled pipe 3
Vibration damping box 31 is filled, vibration damping box 31 is processed by iron sheet, and the double-deck semicircle pole-shell structure, no head cover has at the both ends of semicolumn shell
Lug, opens that there are four through-hole, vibration damping box 31 long 200mm, internal diameter 108mm, thickness of shell 3mm, the interior tables of inner casing on lug
Radial distance between face and the outer surface of shell is 106mm, and the inside of two vibration damping boxes 31 is attached to the pipe shaft of water-filled pipe 3
On, lug is opposite, and four through-holes being aligned on lug are fastened using studs and nut 34, and vibration damping box 31 is made tightly to be bonded
On water-filled pipe 3, iron sand is filled in vibration damping box 31, the iron sand surface after filling up is concordant with the top of vibration damping box 31, is filling
Five pairs of vibration damping boxes 31 are installed altogether on waterpipe 3, between two vibration damping boxes 31 between be divided into 100mm, the lug of two vibration damping boxes 31
Angle is 72 degree between line formed by the lug of formed line and other vibration damping boxes 31 namely the lug of vibration damping box 31 interlocks
Arrangement；At the nozzle of water-filled pipe 3, installation nozzle fixture 32, nozzle fixture 32 is semicircle ring structure, thickness 20mm, interior
Diameter is 108mm, outer diameter 208mm, i.e., the radial distance of inside and outside annulus is 100mm, has lug at the both ends of nozzle fixture 32,
It is provided with through-hole on lug, through-hole is provided on nozzle fixture 32, on the through-hole center on the nozzle fixture 32 of fastening and baffle 33
Threaded hole center be alignment, two nozzle fixtures 32 are attached near the nozzle of water-filled pipe 3, the plane of nozzle fixture 32
Distance away from orifice plane is the thickness of baffle 33, and the lug of nozzle fixture 32 is opposite, tight using studs and nut 35
Gu nozzle fixture 32 is made to be tightly attached at the nozzle of water-filled pipe 3；Baffle 33 is installed at the nozzle of water-filled pipe 3, baffle 33 is
Circular ring structure, thickness 20mm, internal diameter 108mm, outer diameter 324mm are provided with threaded hole, the position of threaded hole on baffle 33
It is matched with the lead to the hole site on nozzle fixture 32, baffle 33 is placed near the nozzle of water-filled pipe 3, utilizes bolt 36
After the through-hole on nozzle fixture 32, baffle 33 is fastened on nozzle fixture 32, at this time the lower surface of baffle 33 and water-filling
What the plane of 3 nozzle of pipeline was generally flush with, the gap between baffle 33 and the nozzle of water-filled pipe 3 is coated with fluid sealant (model：
704) it, is then struck off, is made seamless between baffle 33 and the nozzle of water-filled pipe 3 using paper knife.
The iron sand filled in the vibration damping box 31, particle size range is between 0.2mm-2mm.
The hydrophone vertical linear array 4 is made of eight hydrophones 41, hydrophone B&8103 models of K companies utilize
Coupler reciprocity calibration method carries out consistency calibration, the overall length of hydrophone vertical linear array 4 to the amplitude and phase of hydrophone 41
Degree is 1.4m, and for hydrophone 41 according to the spacing arranged at equal intervals of 0.2m, it is soft that hydrophone 41 using nylon cable tie is fixed on one
On the rope of excellent elasticity, the bottom end of rope hangs a lead, is stretched rope using the weight of lead, each hydrophone 41
Cable is both needed to tighten on rope according to the interval of 0.1m using nylon cable tie；By hydrophone vertical linear array 4 according to shown in Fig. 8
It is placed position in reverberation box；(the present embodiment is not for another termination data collection and analysis equipment of hydrophone vertical linear array 4
It shows).
The head of district 3.6m, wide 3m, high 1.7m are tested in reverberation box, as shown in figure 8, hydrophone vertical linear array distance in test section
Air line distance between babinet wall surface and poly (methyl methacrylate) plate is 1m, between length direction five equidistant measuring points of selection, measuring point
Away from for 0.4m, width direction chooses four equidistant measuring points, and measuring point spacing is 0.33m, and 20 surveys are amounted in such reverberation box
Point.
In Fig. 1~Fig. 7,1 is reverberation box, and 2 be poly (methyl methacrylate) plate, and 3 be water-filled pipe, and 31 be vibration damping box, and 32 be pipe clamp
Tool, 33 be baffle, and 34 be studs and nut, and 35 be studs and nut, and 36 be bolt, and 4 be hydrophone vertical linear array,
41 be hydrophone.
As shown in figure 8, a kind of water-filled pipe jet noise measuring system and measurement method, the step of the measurement method such as
Under：
Step S1：Water will be full of in the reverberation box 1, by hydrophone vertical linear array 4 according to institute in Fig. 7 in test section
The point position shown measures the ambient noise at the different spaces point position of test section, and will be at different spaces point position
Ambient noise is summed, is average；
Step S2：Transmitting transducer is hung at the jet stream district center of reverberation box 1, by hydrophone vertical linear array 4 mixed
It rings in the test section of case 1 according to point position shown in fig. 7, measures the sound source acoustic pressure at the different spaces point position of test section
Power spectrum, reverberation time, and by different spaces point position sound source acoustic pressure power spectrum and the reverberation time summed, put down
；
Step S3：After vibration damping box 31, nozzle fixture 32 and baffle 33 are mounted on water-filled pipe 3, the nozzle of water-filled pipe 3
It is just immersed in the water surface with the upper surface of baffle 33, opens jet source so that the water in water-filled pipe 3 is sprayed with certain speed
To the fluerics of reverberation box 1, the guiding device export of the water of overflow Jing Guo reverberation box 1；
Step S4：It is surveyed according to point position shown in Fig. 7 in the test section of reverberation box 1 by hydrophone vertical linear array 4
Measure water-filled pipe 3 formed submerged jet when acoustic pressure power spectrum, and by the acoustic pressure power spectrum at different spaces point position into
Row sums, is average；
Step S5：Using the acoustic pressure power spectrum data and reverberation time data under transmitting transducer free-field condition, obtain
The room constant of reverberation box 1, and the acoustic pressure power spectrum in step S4 is modified, so that it may it is penetrated under water with obtaining water-filled pipe 3
The free field equivalent sound pressure level and radiated of stream.
The jet noise that the present invention carries out water-filled pipe 3 using the water-filling reverberation box 1 being placed in air measures, and utilizes tank wall
The jet stream radiation acoustic energy of water-filled pipe 3 is stored in reverberation box 1 by good sound reflecting well；It will using poly (methyl methacrylate) plate 2
Reverberation box 1 is divided for fluerics and test section, since the characteristic impedance of poly (methyl methacrylate) plate 2 is approached with water, the jet stream sound in fluerics
Test section can be propagated to well, and the hydrophone of test section is among hydrostatic, not by the flow caused by jet stream
It influences；Reduce the vibration of 3 tube wall of water-filled pipe well using vibration damping box 31；Water-filled pipe 3 is placed in reverberation box 1 and is penetrated
At the water surface site for flowing area, using the absolute soft-sided circle acoustic condition of the water surface, the acoustic radiation ability of nozzle is reduced；Utilize pipe clamp
Tool 32 and baffle 33, which eliminate the eddy current crack generated by nozzle water impact, to be influenced；Utilize the mobile hydrophone vertical line of fixed point
The method of battle array 4 removes the jet noise of acquisition water-filled pipe 3, eliminates and utilizes the hydrophone that space is constantly mobile in underwater reverberation method
Go carry out space average when, hydrophone and hydrophone cables in the process of running, the low frequency noises caused by shake, and
The flow noise caused by opposite hydrostatic movement interferes in operational process；The jet noise of water-filled pipe, examination are measured using reverberation method
It tests implementation to be easier, reduces the workload of measurement.
Claims (6)
1. a kind of measuring system of water-filled pipe jet noise, it is characterised in that：Including water-filled pipe, reverberation box, organic glass
Plate and hydrophone vertical linear array；
Reverberation box is steel rectangular parallelepiped structure, and internal water-filling, top uncovered, bottom uses cross beam support；Poly (methyl methacrylate) plate is installed
Inside reverberation box, reverberation box is divided into two parts：Fluerics and test section；Water-filled pipe is placed on the jet stream of reverberation box
Area；Hydrophone vertical linear array is placed on the test section in reverberation box；
The pipe shaft of the water-filled pipe installs N to vibration damping box, and vibration damping box is the double-deck semicircle pole-shell structure, no head cover, vibration damping box
Internal diameter and the outer diameter of water-filled pipe be identical, there is lug at the both ends of the double-deck semicircle pole-shell structure, there is through-hole on lug, each pair of
The lug of vibration damping box is opposite, is connected at lug, and iron sand is filled inside vibration damping box.
2. a kind of measuring system of water-filled pipe jet noise according to claim 1, it is characterised in that：The water-filling
The nozzle of pipeline is equipped with a pair of of nozzle fixture, and nozzle fixture is semicircle ring structure, the internal diameter of nozzle fixture and water-filled pipe
Outer diameter is identical, and the outside of nozzle fixture carries lug, is provided with through-hole, the lug of two nozzle fixtures is opposite, at lug
Connection.
3. a kind of measuring system of water-filled pipe jet noise according to claim 2, it is characterised in that：The water-filling
The nozzle of pipeline is equipped with baffle, and baffle is connect with nozzle fixture；The internal diameter of baffle and the outer diameter of water-filled pipe are identical, barriers
What the lower surface of plate and the nozzle of water-filled pipe were generally flush with.
4. a kind of measuring system of water-filled pipe jet noise according to claim 3, it is characterised in that：The water-filling
The other end of one termination jet source of pipeline, water-filled pipe is placed on the jet stream district center of reverberation box, and the axis of water-filled pipe hangs down
Directly it is immersed under water in the water surface in reverberation box, the nozzle of water-filled pipe and the upper surface of baffle.
5. a kind of measuring system of water-filled pipe jet noise according to claim 3, it is characterised in that：The baffle
Outer diameter be three times of pipe outside diameter.
6. a kind of measurement method of the measuring system based on water-filled pipe jet noise described in claim 1, it is characterised in that：
Include the following steps,
Step 1：By water-filling in reverberation box, the back of the body in reverberation box at the point position of test section is measured by hydrophone vertical linear array
Scape noise, and the ambient noise at different measuring points position summed, is average；
Step 2：The center of fluerics hangs transmitting transducer in reverberation box, and reverberation box is measured by hydrophone vertical linear array
Acoustic pressure power spectrum, reverberation time at interior test section point position, and at different measuring points position acoustic pressure power spectrum and reverberation
Time is summed, is average；
Step 3：After water-filled pipe is installed vibration damping box, nozzle fixture and baffle, it is attached that the nozzle of water-filled pipe is placed on the water surface
Closely so that the water in water-filled pipe is sprayed with speed K to the fluerics of reverberation box, and the water of overflow is filled by the water conservancy diversion of reverberation box
Set export；
Step 4：The submerged jet that the water-filled pipe at point position is formed is measured by hydrophone vertical linear array in reverberation box to make an uproar
The acoustic pressure power spectrum of sound；
Step 5：The room of reverberation box is calculated in the acoustic pressure power spectrum data and reverberation time data of free field using transmitting transducer
Between constant, the acoustic pressure power spectrum in S4 steps is modified, then obtains the equivalent free field of water-filled pipe submerged jet noise
The radiated of sound pressure level and free field.
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| CN109959444B (en) * | 2017-12-26 | 2021-05-14 | 中国人民解放军海军工程大学 | System and method for testing transient water jet noise full-muffling water tank at outlet of emission pipe |
| CN108562649B (en) * | 2018-03-21 | 2020-09-11 | 哈尔滨工程大学 | Device and method for measuring low-frequency insertion loss of near-water-surface cylindrical shell backing covering layer |
| 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 |
| CN110160637B (en) * | 2018-05-18 | 2021-07-20 | 李文杰 | Method for detecting flushing noise of ceramic toilet by sound power level cylinder measuring surface method |
| CN109141617B (en) * | 2018-08-02 | 2020-11-20 | 哈尔滨工程大学 | Device and method for measuring model flow-induced noise in water tunnel working section |
| CN113432832B (en) * | 2021-06-24 | 2023-01-03 | 哈尔滨工程大学 | Test device for measuring flow-induced noise and vortex-induced noise of marine pipeline |
| CN114046874B (en) * | 2022-01-11 | 2022-03-18 | 中国空气动力研究与发展中心高速空气动力研究所 | Test device for measuring supersonic jet near-field noise |
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