CN106996204B - A kind of anechoic room for fan forced grade aerodynamic noise test - Google Patents
A kind of anechoic room for fan forced grade aerodynamic noise test Download PDFInfo
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- CN106996204B CN106996204B CN201710307346.XA CN201710307346A CN106996204B CN 106996204 B CN106996204 B CN 106996204B CN 201710307346 A CN201710307346 A CN 201710307346A CN 106996204 B CN106996204 B CN 106996204B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H5/00—Buildings or groups of buildings for industrial or agricultural purposes
- E04H5/02—Buildings or groups of buildings for industrial purposes, e.g. for power-plants or factories
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
- E04B1/84—Sound-absorbing elements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F17/00—Vertical ducts; Channels, e.g. for drainage
- E04F17/04—Air-ducts or air channels
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
- E04B1/84—Sound-absorbing elements
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Abstract
The invention discloses a kind of anechoic rooms for fan forced grade aerodynamic noise test, belong to anechoic chamber dss^gn field.Anechoic room is asymmetry structure, the adjacent wall in one corner of anechoic room biases inwardly, its one wall of offset portion is in a vertical shape, coupled wall is oblique, fan forced grade testpieces is installed on the inside of the wall of vertical shape, it is provided with inside and outside culvert exhaust system and exerciser on the outside of wall, is provided with far field microphone array at fan forced grade testpieces diameter of the distance far from fan forced grade testpieces import not less than 15 times；The windward side direction of fan forced grade testpieces is arranged in turbulence control screen, the connection of the air inlet of gas handling system and anechoic room, inside and outside culvert exhaust system increases grade testpieces by fan and connect with anechoic room, exerciser is connect with the fan forced grade testpieces, and the present invention realizes the condition met needed for the fan forced grade noise fest research of engineering grade.
Description
Technical field
The invention belongs to anechoic room technical fields, and in particular to a kind of noise elimination for fan forced grade aerodynamic noise test
Room.
Background technique
Main Noise Sources one of of the fan forced grade testpieces as aircraft, carrying out experimental study to it is that fan is examined to increase
The necessary means and the important link in engine noise experimental study system for Low Noise Design and the noise reduction effect of arbitrarily downgrading.
The domestic laboratory for the research of fan aerodynamic noise mechanism test built or built at present, only 3-
4, basis is very weak；And the fan dimension in these laboratories relatively small (fan diameter is generally less than 0.5m), anechoic room ruler
It is very little it is relatively small (height be generally less than 7m, length and width be less than 10m), can only carry out the generation of single stage fan noise source, propagate and
The basic and qualitative experiment research inhibited, being unable to satisfy large-scale anechoic room, (fan diameter is generally higher than 0.8m, anechoic room height
It is greater than 20m greater than 8m, length and width) verification experimental verification demand.
Existing anechoic chamber dss^gn method is applied to the large-scale anechoic chamber dss^gn of fan forced grade aerodynamic noise test, will be present
Following defect:
1) the considerations of lacking in the prior art to sound field symmetry and corresponding special designing method, it is huge to will lead to construction area
Greatly, cost is high；
2) lack in the prior art to large scale, high-power, sophisticated testing device special Vibration Absorbing System Design technology, can ensure
There are technical problems in terms of the large-scale good sound and vibration quality of anechoic room；
3) lack in the prior art to Long Span Roof design and noise elimination wedge mounting technique, will lead to large-scale anechoic room and set
There are problems for meter.Due to the demand to full free found field, no column supporting structural is needed in anechoic room, in addition a large amount of roofs and point
The self weight split, this brings problem to the design of large area anechoic room roof structure is carried out；
4) lack high frequency sound wave in the prior art and absorbed the considerations of being influenced with temperature and humidity by air, when anechoic room becomes large-sized
Afterwards, will lead to propagation path it is elongated when, noise by air absorb and temperature and humidity influenced can not ignore, in turn result in noise testing essence
Not the case where degree decline or even test data are not available；
5) because existing anechoic room is mostly enclosed construction or there are the air circulation of very little, without the concern for design when design
Dedicated low noise air inlet tower.Therefore lack in the prior art suitable for open, big air stream amount, high noise reduction effect, low noise
The gas handling system design method of reflection cannot form the design of large-scale anechoic room and support；
6) lack the means controlled temperature gradient in anechoic room in the prior art, not can avoid after anechoic room becomes large-sized
Its internal temperature gradient changes the influence to noise testing；
7) lack the method to air inlet turbulence control in the prior art, not can avoid after anechoic room becomes large-sized, inside
Can by ground air inlet objective reality air inlet turbulent flow, can not inlet air conditions under simulated engine high-altitude flight state, Jin Eryin
The presence in quadratic noise source is sent out, leading to test result, there are mistakes；
8) lack and test the low noise sound reflecting microphone arm and its high positioning accurate that use under environment suitable for high-frequency noise
Degree method is unable to satisfy the noise testing demand of frequency range 20k-40kHz large size anechoic room.After being become large-sized because of anechoic room,
Therefore how accurate placement sensor and to guarantee that having lower reflections affect is that large-scale anechoic room builds the pass that must be accumulated
Key technology.
9) lack the method for inspection for carrying out 20kHz frequencies above sound absorbing performance to noise elimination wedge and whole elimination room, Wu Faman
Foot acupuncture therapy is to full ruler or contracts than the accurate testing requirement of fan forced grade component noise.
Summary of the invention
The purpose of the present invention: to solve the above-mentioned problems, the invention proposes one kind to be used for fan forced grade aerodynamic noise
The anechoic room of test, anechoic room is laid out using asymmetry and the design of large span steel reinforced concrete construction roof, exerciser are set using vibration isolation
It counts, gas handling system uses open and low noise reflective design, and the control of temperature and humidity gradients affect is using thermal insulation of roof design and in fact
When monitoring system design, test bracket uses high position precision and low noise reflective design, and high frequency calibrating is using the calibrating voluntarily researched and developed
System and Calibration Technology meet the noise testing demand of large-scale anechoic room.
A kind of technical solution of the present invention: anechoic room for fan forced grade aerodynamic noise test, comprising: exerciser,
Inside and outside culvert exhaust system, gas handling system, turbulence control screen；
The anechoic room is asymmetry structure, and two adjacent walls in one corner of anechoic room are biased to anechoic room direction,
Installation space is formed, fan forced grade testpieces, wall are installed on the inside of the wherein wall in two adjacent walls of the biasing
Outside be provided with inside and outside culvert exhaust system and exerciser, far from fan forced grade testpieces entrance be provided with far field pass
Sound device array, distance of the far field microphone array away from fan forced grade testpieces entrance are fan forced not less than 15 times
Grade testpieces diameter；The entrance of the fan forced grade testpieces is arranged in the turbulence control screen, to the fan
The inlet flow field of booster stage testpieces is rectified, and inlet flow field inlet distortion is controlled, and " additional " noise is inhibited to lead to the problem of；
The exerciser, inside and outside culvert exhaust system, fan forced grade testpieces arrange along same axis, each system axle center
It is consistent；
The connection of the air inlet of the gas handling system and anechoic room, the inside and outside culvert exhaust system and fan forced grade are tested
Part connection, fan forced grade testpieces is located in anechoic room, the exerciser by the inside and outside transmission shaft contained in exhaust system and
The fan forced grade testpieces connection, provides power for it；
It is isolated between the inside and outside culvert exhaust system and exerciser and the anechoic room using wall, the anechoic room
Wall is two-layer wall, and cavity or filling radiation sound-absorbing material, the centre-height setting of the anechoic room are reserved between wall
It is 5-8 times of fan forced grade testpieces diameter；
The far field microphone array is uniformly distributed in arc-shaped centered on fan forced grade testpieces entrance, each transaudient
Angle interval between device is not more than 5 °, and test angle range is 5 ° -120 °, and the far field microphone array is to anechoic room
The distance of wall is not less than 3m；
The noise elimination indoor location noise elimination wedge, the noise elimination wedge cutoff frequency are anechoic room test noise low-limit frequency
70% or more, and the noise elimination wedge in the frequency range of institute's test noise acoustic absorptivity be not less than 0.99.
Preferably, the anechoic room roof is provided with large span from load steelframe support construction, the top of the support construction
Portion is provided with protection structure, and the protection structure is connect by triangle interactive mode connection structure with the support construction, the branch
The lower surface of support structure is equipped with noise elimination wedge；
The protection structure includes: the shale protective layer being arranged from top to bottom, polyester blank band protective layer, screed-coat and hydrophobic
Pearlite insulating layer, for avoiding generating temperature gradient because of periods of direct sunlight inside anechoic room.
Preferably, the inside and outside culvert exhaust system is made of main duct, by-pass air duct and exhausting silencer tower, the main duct
It is connect with the rear end of by-pass air duct with exhausting silencer tower, the front end of the main duct and by-pass air duct is connected with fan forced grade testpieces
It connects；
Preferably, the exerciser is made of motor, gear-box and torsion axis, and the exerciser is by turning round axis and transmission shaft
It is connect with fan forced grade testpieces, the motor, gear-box, torsion axis are sequentially connected, and are co-located on same concrete platform
On, the concrete platform is isolated with anechoic room；
The concrete platform is formed by upper layer basis, subfoundation and positioned at cushion blocking between the two.
Preferably, the gas handling system is made of air intake guiding unit and intake noise reduction tower；
The air intake guiding unit is arranged in intake noise reduction tower, and the intake noise reduction tower is provided with inlet duct, filtering
Device and silencer, air-flow sequentially enter filter device and silencer through inlet duct, enter through the air intake guiding unit and disappear
In sound chamber；
The filter device is arranged in inlet duct, by air inlet louver, stainless steel protective net, electric rolling door and G4 grades
Filter composition；
The outside of air flow inlet of the stainless steel protective net close to the inlet duct, the G4 grades of filter setting exist
The inside of the inlet duct air flow inlet, the air inlet louver setting are filtered in the stainless steel protective net far from described G4 grades
The G4 grades of filter is arranged in close to the side of the stainless steel protective net in the side of device, the electric rolling door；
Closed cavity, setting in the closed cavity are provided between the stainless steel protective net and the G4 grades of filter
There is monitoring device.
Preferably, the turbulence control screen turbulence control unit composition exists to solve surface noise test process
Biggish air inlet turbulent flow causes surface noise test result that can not reflect the noise problem under airflight state；On the other hand it uses
To solve, using causing after asymmetric anechoic room layout designs, inlet flow field is asymmetric, air inlet turbulivity is further increased, generated
The problem of " additional " noise.
Preferably, the anechoic room is internally provided with Temperature and Humidity point, and the Temperature and Humidity point is in 6 bit distributions,
To carry out temperature and humidity measure, temperature gradient monitoring；
The selection of the Temperature and Humidity point is foundation based on the calculated result in the flow field CFD, with fan forced grade testpieces
Centered on, three different radiuses and two different angles are evenly distributed with, can be to high frequency sound wave by air absorption and temperature and humidity
Influence is analyzed, and can solve anechoic room and become large-sized rear noise and absorbed by air is influenced with temperature and humidity, leads to noise testing
Inaccurate technical problem.
Preferably, the anechoic room further includes noise elimination wedge and anechoic room acoustic characteristic detection system；
The noise elimination wedge and anechoic room acoustic characteristic detection system include: medium-high frequency sound source, acoustic waveguide tube, test branch
Frame, microphone, bracing wire steel wire, data acquisition device and control device；
When carrying out anechoic room acoustic characteristic detection, the acoustic waveguide tube need to be passed through the anechoic room and medium-high frequency sound
Source connection, the acoustic waveguide tube mounting axis and the anechoic room center line are located on sustained height, and the medium-high frequency sound source is logical
It crosses the acoustic waveguide tube and transmits sound wave into the anechoic room；High-frequency sound source radiated sound field has good uniform properties in the middle
When, acoustic waveguide tube can not be used, and directly medium-high frequency sound source is placed in the anechoic room, and medium-high frequency sound source is installed
Axis and the anechoic room center line to be checked are located on sustained height, and the medium-high frequency sound source is directly passed into the anechoic room
Pass sound wave；
When carrying out noise elimination wedge acoustic characteristic detection, the acoustic waveguide tube need to be passed through anechoic room and medium-high frequency sound source
Connection, the acoustic waveguide tube mounting axis are located on sustained height with the wedge to be checked and anechoic room center line, the middle height
Frequency sound source transmits sound wave into anechoic room by the acoustic waveguide tube；High-frequency sound source radiated sound field has good uniform spy in the middle
Property when, acoustic waveguide tube can not used, and directly medium-high frequency sound source is placed in anechoic room, and make medium-high frequency sound source installation axle
Line is located on sustained height with noise elimination wedge exemplar to be checked and anechoic room center line, and the medium-high frequency sound source is directly to anechoic room
Interior transmitting sound wave；
The test bracket is arranged between the acoustic waveguide tube and wedge exemplar or the anechoic room, the test bracket
The microphone and data acquisition device are installed in front end, and the test bracket, can be along described under control device control
Bracing wire steel wire moves between the wedge exemplar or the anechoic room and the acoustic waveguide tube；
The noise elimination wedge and anechoic room acoustic characteristic detection system, can obtain sound on propagation path acoustic pressure with biography
The attenuation change characteristic for broadcasting distance, after considering aerial temperature and humidity to the influence of fading amendment of sound transmission, and and theoretical attenuation
Curve is compared, and can obtain wedge absorber in the sound absorption characteristics of middle and high frequency range.
Preferably, the test bracket includes sensor stand, lifting measuring head, laser locator, the sensor branch
Frame is made of pedestal, lower fulcrum bar, upper rack posts, pulley wire rope structure and industrial universal caster wheel；
The pedestal is square, and mounting industrial universal caster wheels are distinguished at four base angles, pedestal by it is lower and on successively right angle setting
There are lower fulcrum bar and upper rack posts, upper rack posts top axis direction is equipped with pulley wire rope structure, perpendicular to upper rack posts axis
Direction is provided with laser locator and lifting measuring head.
Technical effect of the invention: the present invention increases on the basis of traditional anechoic chamber dss^gn, for former ruler or contracting than fan
The uniqueness of large-scale anechoic chamber dss^gn needed for testpieces aeroacoustics of arbitrarily downgrading test, and comprehensively consider economy and usability
Demand, in geomery, sound and vibration quality control, data of the Temperature and Humidity module influences and amendment, air inlet turbulence control, low noise air inlet Deethanizer design
Aspect carries out proprietary design, forms a kind of large-scale anechoic room for fan forced grade aerodynamic noise test.
Detailed description of the invention
Fig. 1 is a kind of structure of a preferred embodiment of the anechoic room for fan forced grade aerodynamic noise test of the present invention
Schematic diagram；
Fig. 2 is the large span of the anechoic room of embodiment illustrated in fig. 1 from load steelframe support construction schematic diagram；
Fig. 3 is the exerciser Vibration Absorbing System Design schematic diagram of embodiment illustrated in fig. 1；
Fig. 4 is the gas handling system design diagram of embodiment illustrated in fig. 1；
Fig. 5 is the filter apparatus configuration schematic diagram of embodiment illustrated in fig. 4；
Fig. 6 is the present invention a kind of the noise elimination wedge and anechoic room sound of the anechoic room for fan forced grade aerodynamic noise test
Learn the structural schematic diagram of one preferred embodiment of Characteristics Detection system；
Wherein, 1- anechoic room, 2- gas handling system, the far field 3- microphone array, 4- noise elimination wedge, 5- turbulence control screen, 6-
Fan forced grade testpieces, 7- motor, 8- gear-box, 9- turn round axis, 10- by-pass air duct, 11- exhausting silencer tower, 12- main duct, 13-
Support construction, 14- protect structure, and 15- triangle interactive mode connection structure, the upper layer 16- is basic, 17- subfoundation, 18- cushion blocking,
19- air intake guiding unit, 20- intake noise reduction tower, 21- inlet duct, 22- silencer, 23- air inlet louver, the protection of 24- stainless steel
Net, 25- electric rolling door, 26-G4 grades of filters, 27- monitoring device, 28- medium-high frequency sound source, 29- acoustic waveguide tube, 30- test
Bracket, 31- microphone, 32- bracing wire steel wire, 33- data acquisition device, 34- control device.
Specific embodiment
To keep the purposes, technical schemes and advantages of the invention implemented clearer, below in conjunction in the embodiment of the present invention
Attached drawing, technical solution in the embodiment of the present invention is further described in more detail.In the accompanying drawings, identical from beginning to end or class
As label indicate same or similar element or element with the same or similar functions.Described embodiment is the present invention
A part of the embodiment, instead of all the embodiments.The embodiments described below with reference to the accompanying drawings are exemplary, it is intended to use
It is of the invention in explaining, and be not considered as limiting the invention.Based on the embodiments of the present invention, ordinary skill people
Member's every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.Under
Face is described in detail the embodiment of the present invention in conjunction with attached drawing.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", "front", "rear",
The orientation or positional relationship of the instructions such as "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside" is based on attached drawing institute
The orientation or positional relationship shown, is merely for convenience of description of the present invention and simplification of the description, rather than the dress of indication or suggestion meaning
It sets or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as protecting the present invention
The limitation of range.
The embodiment of the present invention is described in detail with reference to the accompanying drawing, please refers to Fig. 1 to Fig. 6；
A kind of anechoic room for fan forced grade aerodynamic noise test, comprising: exerciser, inside and outside culvert exhaust system, into
Gas system 2, turbulence control screen 5；
Anechoic room 1 is asymmetry structure, and two adjacent walls in one corner of anechoic room are biased to anechoic room direction, partially
Setting part, wherein a wall is in a vertical shape, another coupled wall is oblique, installation space is formed, in vertical shape
Wall on the inside of fan forced grade testpieces 6 is installed, be provided with inside and outside culverts exhaust system and exerciser on the outside of wall, noise elimination
Room 1 is designed using unsymmetric structure, solves the problems, such as that large-scale anechoic room construction area is big, is saved anechoic room to the greatest extent and is built
If area, cost is saved.
The wall of anechoic room 1 is two-layer wall structure, reserves cavity or filling sucting sound material between wall, guarantees wall foot
Enough sound insulation and vibration isolating effect.
Based on sound field symmetry principle, it will be placed on the side of anechoic room into inside and outside culvert exhaust system axis, and is located at and disappears
Sound chamber center indexed plane.Intake and exhaust axis and anechoic room center line keep biggish distance, save anechoic room to the greatest extent
Area, but the influence of the factors such as distance that need to consider air inlet turbulence control, intake and exhaust axial line distance anechoic room wall are built, is guaranteed
The noise data of noise elimination indoor test is not influenced by space is asymmetrical.
Anechoic room height should comprehensively consider fan forced grade testpieces inlet diameter, so that fan forward pass noise will not be because disappearing
Sound chamber's height is too small to cause sound field to distort, and the centre-height of anechoic room is 5-8 times of fan forced grade testpieces diameter, this implementation
In example, the centre-height of anechoic room is preferably 8 times of testpieces diameter.
Exerciser, inside and outside culvert exhaust system, fan forced grade testpieces 6 arrange that each system axle center is kept along axis one by one
Unanimously, and between inside and outside culvert exhaust system and exerciser and the anechoic room it is isolated using thick and heavy wall, and is aided with other sound insulation
Vibration isolation measure avoids exerciser running noises from being passed to anechoic room to greatest extent.
Exerciser is made of motor 7, gear-box 8 and torsion axis 9, and exerciser is by turning round axis 9 and fan forced grade testpieces 6
Connection, motor 7, gear-box 8, torsion axis 9 and exhaust volute are sequentially connected, are co-located on same concrete platform, concrete
Platform is formed by upper layer basis 16, subfoundation 17 and positioned at cushion blocking 18 between the two, is made full use of between each vibration source
It influences each other, as much as possible consumes and absorb vibrational energy；Concrete platform is isolated with anechoic room, avoids being in contact and just
Property connection, or be attached using dedicated vibration isolation measure.
The import of fan forced grade testpieces 6 is arranged in turbulence control screen 5, to rectify to inlet flow field, controls
Inlet flow field and inlet air flow distortion solve during the static test of ground into present in the air-flow of fanjet import
The problem of stable state, unsteady-state distortion or turbulent flow, reaches engine charge condition in simulated flight, eliminates what " additional " noise generated
Purpose.
At fan forced grade testpieces 6 diameter of the distance far from fan forced 6 import of grade testpieces not less than 15 times
It is provided with far field microphone array；Angle interval between each microphone is not more than 5 °, and test angle range is 5 ° -120 °,
The distance for meeting far field microphone array 3 to fan forced 6 import of grade testpieces should meet the far-field radiation condition of fan sound source,
Far field microphone array 3 should keep certain distance apart from anechoic room wall, be not less than 3m；Avoid anechoic room wall and noise elimination wedge
Microphone test is impacted.
1 roof of anechoic room is provided with large span and is provided with protection from the top of load steelframe support construction 13, support construction
Structure 14, protection structure 14 are connect by triangle interactive mode connection structure 15 with support construction 13, the lower surface of support construction 13
Noise elimination wedge 4 is installed；
Protection structure 14 includes: that the shale protective layer being arranged from top to bottom, polyester blank band protective layer, screed-coat and hydrophobic are precious
Pearl rock insulating layer.On the one hand the part-structure ensure that the conventional funcs such as the heat-insulated of anechoic room roof, waterproof；Meet without column branch
Support, with it is stronger from load-carrying construction, laying that large area wedge can be supported, good oise insulation factor, good fire resistance characteristic
Deng requirement.
The lower surface of support construction is equipped with noise elimination wedge 4, and 4 cutoff frequency of noise elimination wedge is that anechoic room test noise is minimum
70% or more of frequency, noise elimination wedge surface are non-metal facesheet materials, avoid existing eliminating the noise to high frequency and fail, noise elimination wedge is answered
Acoustic absorptivity is not less than 0.99 in the frequency range of institute's test noise, using lightweight, high performance wedge, and using novel
Mounting support structure design, novel form, it is fixed to efficiently solve wedge light and flexible under the conditions of guaranteeing that installation is convenient
The problem of position, and fully ensured that noise elimination wedge has enough back chambers, wedge is improved to the acoustical absorptivity of low-frequency sound wave.
Inside and outside culvert exhaust system is made of main duct 12, by-pass air duct 10 and exhausting silencer tower 11；Inside and outside culvert exhaust system
Comprising exhaust volute, the rear end of main duct 12 and by-pass air duct 10 is connect with exhausting silencer tower 11, main duct 12 and by-pass air duct 10
Front end is connected with fan forced grade testpieces 6
Gas handling system 2 is made of air intake guiding unit and intake noise reduction tower, and air intake guiding unit 19 is arranged in intake noise reduction
In tower 20, intake noise reduction tower 20 is provided with inlet duct 21, filter device and silencer 22, air-flow through inlet duct 21 successively into
Enter filter device and silencer, enters in anechoic room through air intake guiding unit 19；
Filter device be arranged in inlet duct 21, by air inlet louver 23, stainless steel protective net 24, electric rolling door 25 and
G4 grades of filters 26 form；
Stainless steel protective net 24 mainly prevents the sundries such as fallen leaves from entering close to the outside of the air flow inlet of inlet duct 21；
The inside of 21 air flow inlet of inlet duct is arranged in G4 grades of filters 26, to the charge air flow in experimentation
Last filtering is carried out, dust etc. is filtered out；
Side of the stainless steel protective net 24 far from the G4 grades of filter 26 is arranged in air inlet louver 23, mainly prevents
Flying bird, dust storm, sleet etc. enter intake noise reduction tower 20；
G4 grades of filters 26 are arranged in close to the side of the stainless steel protective net 24 in electric rolling door 25；For in non-examination
Guarantee intake noise reduction tower 20 not by the pollution of any external impurities during testing；
It is provided with closed cavity between stainless steel protective net 24 and G4 grades of filters 26, monitoring dress is provided in closed cavity
27 are set, for checking the outwardly sound of filter device.
Above-mentioned gas handling system 2 meets open, big air stream amount, the design of the anechoic room gas handling system of low noise sound reflecting is wanted
It asks, guarantees that charge air flow has uniform, unobstructed runner, reduce flow distortion and flow losses.
Anechoic room is internally provided with 6 Temperature and Humidity points, arranges that six points carry out temperature, humidity inspection inside anechoic room
It surveys, temperature gradient monitoring, temperature gradient etc. is avoided to change the influence to noise testing result.
The selection of Temperature and Humidity point is that the calculated result based on the flow field CFD is foundation, is with fan forced grade testpieces 6
Center, three different radiuses and two different angles are evenly distributed with；It is determined after optimized selection.The principle of selection is and root
According to the location arrangements temperature and humidity integrative sensor in calculated result there may be larger temperature gradient.Meanwhile not influence sound
The temperature gradient of temperature along longitudinal direction is accurately measured under the premise of learning measurement, it is specific that temperature and humidity is installed using liftable electric hoist
Sensor, and electric hoist is hidden in the wedge on roof, reduce sound wave reflecting surface.Meanwhile binding test frequency range is developed
A kind of temperature and humidity revision program reaches and accurately obtains contracting than fan forced grade testpieces high-frequency noise radiation law and characteristic
Ability.
Anechoic room further includes noise elimination wedge and anechoic room acoustic characteristic detection system, noise elimination wedge and anechoic room acoustic characteristic
Detection system includes: medium-high frequency sound source 28, acoustic waveguide tube (optional) 29, test bracket 30, microphone 31, bracing wire steel wire 32, number
According to acquisition device 33 and control device 34；
When carrying out the detection of anechoic room acoustic characteristic, acoustic waveguide tube 29 need to be passed through anechoic room 1 and be connect with medium-high frequency sound source 28,
29 mounting axis of acoustic waveguide tube and the anechoic room center line are located on sustained height, and medium-high frequency sound source 28 passes through acoustic waveguide tube 29
Sound wave is transmitted into anechoic room；When 28 radiated sound field of high-frequency sound source has good uniform properties in the middle, acoustic waveguide can not used
Pipe 29, and directly medium-high frequency sound source 28 is placed in anechoic room 1, and 28 mounting axis of medium-high frequency sound source is disappeared with to be checked
Sound chamber's center line is located on sustained height, and medium-high frequency sound source 28 directly transmits sound wave into the anechoic room.
When carrying out the detection of noise elimination wedge acoustic characteristic, acoustic waveguide tube 29 need to be passed through anechoic room 1 and connected with medium-high frequency sound source 28
It connects, 29 mounting axis of acoustic waveguide tube is located on sustained height with wedge to be checked and anechoic room center line, and medium-high frequency sound source 28 passes through
Acoustic waveguide tube 29 transmits sound wave into anechoic room；It, can not when 28 radiated sound field of high-frequency sound source has good uniform properties in the middle
Using acoustic waveguide tube 29, and directly medium-high frequency sound source 28 is placed in anechoic room 1, and make 28 mounting axis of medium-high frequency sound source
It is located on sustained height with noise elimination wedge exemplar and anechoic room center line to be checked, the medium-high frequency sound source 28 is directly to anechoic room
Interior transmitting sound wave.
Test bracket 30 is arranged between acoustic waveguide tube 29 and wedge exemplar (or described anechoic room), 30 front end of test bracket
Microphone 31 and data acquisition device 33 are installed, test bracket 30, can be along the bracing wire steel wire under the control of control device 34
32 move between wedge exemplar (or described anechoic room) and the acoustic waveguide tube 29.
Noise elimination wedge and anechoic room acoustic characteristic detection system, can obtain sound on propagation path acoustic pressure with propagate away from
From attenuation change characteristic, after considering aerial temperature and humidity to the amendment of the influence of fading of sound transmission, and with theoretical attenuation curve
It is compared, wedge absorber can be obtained in the sound absorption characteristics of middle and high frequency range.
Noise elimination wedge and anechoic room acoustic characteristic detection system, which are directed to existing medium-high frequency sound source, generally has acoustic field uniformity
The disadvantage of difference.The characteristics of small, wave surface is plane is lost in suitable diameter pipeline internal communication based on sound wave, forms one kind
Medium-high frequency sound system that medium-high frequency sound source is combined with acoustic waveguide tube, with good acoustic field uniformity solves noise elimination point
Split the sound source problem with the detection of anechoic room medium-high frequency.
Test bracket 30 include sensor stand, lifting measuring head, sensor stand described in laser locator by pedestal, under
Strut, upper rack posts, pulley wire rope structure and industrial universal caster wheel composition；
Pedestal is square, and mounting industrial universal caster wheels are distinguished at four base angles, pedestal by it is lower and on be sequentially installed with lower fulcrum bar
And upper rack posts, upper rack posts top axis direction are equipped with pulley wire rope structure, perpendicular to upper rack posts axis direction be provided with it is sharp
Light-seeking device and lifting measuring head；Above-mentioned test macro can realize longitudinal height it is adjustable, laterally it is stepless it is adjustable, location error is small,
The low function of reflection coefficient.Meet under high frequency (reaching as high as 40kHz) noise testing environment to the sound reflecting of test bracket low noise, height
Positioning accuracy request.
The invention proposes a kind of anechoic room for fan forced grade aerodynamic noise test, using asymmetry layout and
The design of large span steel reinforced concrete construction roof, exerciser use Vibration Absorbing System Design, and gas handling system uses open and low noise reflective design,
Testpieces import uses turbulence control technology, monitors and inhibits temperature and humidity to influence using modification method, sensor stand is using high
Accuracy test bracket meets the noise testing demand of large-scale anechoic room, overcomes prior art anechoic room construction cost excessively high
The problems such as problem and high frequency are examined and determine.
Finally it is noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations.To the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, those skilled in the art should understand that: it is still
It is possible to modify the technical solutions described in the foregoing embodiments, or part of technical characteristic is equally replaced
It changes；And these are modified or replaceed, the essence for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution
Mind and range.
Claims (9)
1. a kind of anechoic room for fan forced grade aerodynamic noise test characterized by comprising exerciser, inside and outside culvert row
Gas system, gas handling system (2), turbulence control screen (5)；
The anechoic room (1) is asymmetry structure, and two adjacent walls in one corner of anechoic room are biased to anechoic room direction, shape
At installation space, fan forced grade testpieces (6), wall are installed on the inside of the wherein wall in two adjacent walls of the biasing
Outside be provided with inside and outside culvert exhaust system and exerciser, fan forced grade testpieces (6) entrance is being provided with far field
Microphone array (3), distance of the far field microphone array (3) away from fan forced grade testpieces (6) entrance are not less than 15
Fan forced grade testpieces (6) diameter again；The turbulence control screen (5) is arranged in the fan forced grade testpieces (6)
Entrance location is rectified to the inlet flow field to the fan forced grade testpieces (6), control inlet flow field and inhibit into
Mouth inlet distortion；
The exerciser, inside and outside culvert exhaust system, fan forced grade testpieces (6) arrange that each system axle center is protected along same axis
It holds consistent；
The gas handling system (2) connect with the air inlet of anechoic room, the inside and outside culvert exhaust system and fan forced grade testpieces
(6) it connects, the exerciser is connected with inside and outside culvert exhaust system, passes through the transmission shaft and fan in inside and outside culvert exhaust system
Booster stage testpieces (6) connection, provides power for it；
It is isolated between the inside and outside culvert exhaust system and exerciser and the anechoic room (1) using wall, the wall of the anechoic room
Body is two-layer wall, and cavity is reserved between wall or filling radiation sound-absorbing material, the centre-height of the anechoic room are set as
5-8 times of fan forced grade testpieces (6) diameter；
The far field microphone array (3) is uniformly distributed in arc-shaped centered on fan forced grade testpieces (6) entrance, Mei Gechuan
Angle interval between sound device is not more than 5 °, and test angle range is 5 ° -120 °, and the far field microphone array (3) is to disappearing
The distance of the wall of sound chamber (1) is not less than 3m；
The noise elimination indoor location noise elimination wedge, the noise elimination wedge cutoff frequency are anechoic room test noise low-limit frequency
70% or more, and noise elimination wedge acoustic absorptivity in the frequency range of institute's test noise is not less than 0.99.
2. the anechoic room according to claim 1 for fan forced grade aerodynamic noise test, it is characterised in that: described to disappear
Sound chamber (1) roof is provided with large span and is provided with protection knot from the top of load steelframe support construction (13), the support construction
Structure (14), the protection structure (14) is connect by triangle interactive mode connection structure (15) with the support construction (13), described
The lower surface of support construction (13) is equipped with noise elimination wedge (4)；
Protection structure (14) includes: the shale protective layer being arranged from top to bottom, polyester blank band protective layer, screed-coat and hydrophobic
Pearlite insulating layer.
3. the anechoic room according to claim 1 for fan forced grade aerodynamic noise test, it is characterised in that: described
Inside and outside culvert exhaust system is made of main duct (12), by-pass air duct (10) and exhausting silencer tower (11), the main duct (12) and outer
The rear end of duct (10) is connect with exhausting silencer tower (11), and the front end of the main duct (12) and by-pass air duct (10) is increased by fan
Testpieces (6) of arbitrarily downgrading is connect with the anechoic room (1).
4. the anechoic room according to claim 1 for fan forced grade aerodynamic noise test, it is characterised in that: the examination
It tests device to be made of motor (7), gear-box (8) and torsion axis (9), and the exerciser connects the inside and outside culvert row by turning round axis (9)
Gas system, and connect by the inside and outside transmission shaft for containing exhaust system with fan forced grade testpieces (6), the motor
(7), gear-box (8), torsion axis (9) are sequentially connected, and are co-located on same concrete platform, the concrete platform and noise elimination
Room isolation；
The concrete platform is formed by upper layer basis (16), subfoundation (17) and positioned at cushion blocking (18) between the two.
5. the anechoic room according to claim 1 for fan forced grade aerodynamic noise test, it is characterised in that: it is described into
Gas system (2) is made of air intake guiding unit (19) and intake noise reduction tower (20)；
In intake noise reduction tower (20), the intake noise reduction tower (20) is provided with air inlet dress for air intake guiding unit (19) setting
(21), filter device and silencer (22) are set, air-flow sequentially enters filter device and silencer through inlet duct (21), through described
Air intake guiding unit (19) enters in anechoic room；
The filter device setting is in inlet duct (21), by air inlet louver (23), stainless steel protective net (24), electric rolling
Door (25) and G4 grades of filter (26) compositions；
The stainless steel protective net (24) is close to the outside of the air flow inlet of the inlet duct (21), the G4 grades of filter
(26) setting is protected in the inside of the inlet duct (21) air flow inlet, air inlet louver (23) setting in the stainless steel
Side of the net (24) far from the G4 grades of filter (26), the electric rolling door (25) are arranged in the G4 grades of filter (26)
Close to the side of the stainless steel protective net (24)；
Closed cavity is provided between the stainless steel protective net (24) and the G4 grades of filter (26), in the closed cavity
It is provided with monitoring device (27).
6. the anechoic room according to claim 1 for fan forced grade aerodynamic noise test, it is characterised in that: the rapids
Flow control screen (5) is made of multiple turbulence control units, is able to solve air inlet turbulent flow existing for surface noise test process and is caused
Surface noise test result can not reflect the noise problem under airflight state；On the other hand it is able to solve and is disappeared using asymmetric
After sound chamber's layout designs, cause that inlet flow field is asymmetric, air inlet turbulivity further increases, leads to the problem of additional noise.
7. the anechoic room according to claim 1 for fan forced grade aerodynamic noise test, it is characterised in that: described to disappear
Sound chamber is internally provided with Temperature and Humidity point, and the Temperature and Humidity point is in 6 bit distributions, to carry out temperature, humidity inspection
It surveys, temperature gradient monitoring；
The selection of the Temperature and Humidity point is foundation based on the calculated result in the flow field CFD, is with fan forced grade testpieces (6)
Center, three different radiuses and two different angles are evenly distributed with.
8. the anechoic room according to claim 1 for fan forced grade aerodynamic noise test, it is characterised in that: described to disappear
Sound chamber further includes noise elimination wedge and anechoic room acoustic characteristic detection system；
The noise elimination wedge and anechoic room acoustic characteristic detection system include: medium-high frequency sound source (28), acoustic waveguide tube (29), test
Bracket (30), microphone (31), bracing wire steel wire (32), data acquisition device (33) and control device (34)；
When carrying out anechoic room acoustic characteristic detection, the acoustic waveguide tube (29) passes through the anechoic room (1) and medium-high frequency sound
Source (28) connection, acoustic waveguide tube (29) mounting axis and the anechoic room center line are located on sustained height, the middle height
Frequency sound source (28) is by transmitting sound wave in the acoustic waveguide tube (29) Xiang Suoshu anechoic room；High-frequency sound source (28) radiated sound field in the middle
It when with good uniform properties, does not use acoustic waveguide tube (29), and medium-high frequency sound source (28) is directly placed in the noise elimination
In room (1), and medium-high frequency sound source (28) mounting axis and the anechoic room center line to be checked are located on sustained height, institute
It states medium-high frequency sound source (28) and directly transmits sound wave into the anechoic room；
When carrying out noise elimination wedge acoustic characteristic detection, the acoustic waveguide tube (29) need to be passed through anechoic room (1) and medium-high frequency
Sound source (28) connection, acoustic waveguide tube (29) mounting axis are located on sustained height with wedge to be checked and anechoic room center line,
The medium-high frequency sound source (28) transmits sound wave into anechoic room by the acoustic waveguide tube (29)；High-frequency sound source (28) radiates in the middle
It when sound field has good uniform properties, does not use acoustic waveguide tube (29), and medium-high frequency sound source (28) is directly placed in noise elimination
In room (1), and it is same that medium-high frequency sound source (28) mounting axis and noise elimination wedge exemplar to be checked and anechoic room center line are located at
In one height, the medium-high frequency sound source (28) directly transmits sound wave into anechoic room；
The test bracket (30) is arranged between the acoustic waveguide tube (29) and wedge exemplar or the anechoic room, the test
The microphone (31) is installed in bracket (30) front end and data acquisition device (33), the test bracket (30) fill in the control
It sets under (34) control, it can be along the bracing wire steel wire (32) in the wedge exemplar or the anechoic room and the acoustic waveguide tube
(29) it is moved between.
9. the anechoic room according to claim 8 for fan forced grade aerodynamic noise test, it is characterised in that: the survey
Try bracket (30) include sensor stand, lifting measuring head, laser locator, the sensor stand by pedestal, lower fulcrum bar, on
Strut, pulley wire rope structure and industrial universal caster wheel composition；
The pedestal is square, and mounting industrial universal caster wheels are distinguished at four base angles, pedestal by it is lower and on be successively vertically installed with down
Strut and upper rack posts, upper rack posts top axis direction is equipped with pulley wire rope structure, perpendicular to the direction of upper rack posts axis
It is provided with laser locator and lifting measuring head.
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| CN109979424B (en) * | 2019-04-03 | 2023-11-03 | 南京大学 | Method for improving performance of active noise reduction system by using two-sided partition walls |
| CN110332986A (en) * | 2019-07-31 | 2019-10-15 | 中国航发沈阳发动机研究所 | A kind of turbulence control holds one's breath and keep quiet calibration system and method |
| CN112798286B (en) * | 2021-03-19 | 2021-07-06 | 中国航发上海商用航空发动机制造有限责任公司 | Distortion generating device for aircraft engine |
| CN113252338A (en) * | 2021-06-08 | 2021-08-13 | 浙江大学 | Detection device and estimation method for aerodynamic noise outside valve |
| CN113092118B (en) * | 2021-06-09 | 2021-09-28 | 中国航发上海商用航空发动机制造有限责任公司 | Full-scale fan-booster stage performance test device and test method |
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