CN110319920A - A kind of noise quantitative forecast method and system based on equipment equivalent sound source point - Google Patents
A kind of noise quantitative forecast method and system based on equipment equivalent sound source point Download PDFInfo
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- CN110319920A CN110319920A CN201910403177.9A CN201910403177A CN110319920A CN 110319920 A CN110319920 A CN 110319920A CN 201910403177 A CN201910403177 A CN 201910403177A CN 110319920 A CN110319920 A CN 110319920A
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Abstract
A kind of noise quantitative forecast method, system and computer readable storage medium based on equipment equivalent sound source point provided in an embodiment of the present invention, wherein method includes: the corresponding origin world coordinates of local coordinate origin for obtaining over-the-counter observation point world coordinates and opening equipment；It obtains to open the corresponding equivalent sound source point acoustical power frequency spectrum of equipment and obtain from equipment equivalent source point data base and opens the corresponding equivalent sound source point local coordinate of equipment；According to over-the-counter observation point world coordinates and origin world coordinates, equivalent sound source point local coordinate is converted into equivalent sound source point world coordinates；Obtain the relative position of over-the-counter observation point equivalent sound source point corresponding with equipment is opened；Calculate the first overall sound pressure level for opening equipment corresponding equivalent sound source point appearance measuring point on the scene under semi-free state；Attenuation processing is carried out to the first overall sound pressure level, obtains the second overall sound pressure level for opening equipment corresponding equivalent sound source point appearance measuring point on the scene in the mounted state；Export second overall sound pressure level.
Description
Technical field
The present invention relates to ships, track train noise calculation technical field, in particular to one kind based on equipment etc.
Imitate the noise quantitative forecast method and system of point source of sound.
Background technique
In ship, track train field, mobile unit external radiated noise in the running is seriously affected and is occupied around track
The comfort of the people and station passenger.Therefore the track trains such as high-speed rail require pass-by noise index when delivering and checking and accepting, track
The noise of train is more than this noise objective, then the track train must not be delivered for use.Therefore, it in the track train design phase, needs
Forecast pass-by noise value according to mobile unit situation, to vehicle-mounted every type equipment, as tractive transformer, traction convertor, air-conditioning,
Useless row etc., gives an acoustical power limit value, occurs noise situation not up to standard when track train being avoided to deliver, can be significantly less
The cost cost of noise abatement is carried out after the completion of train manufacture again.
Domestic and foreign scholars more establishing criterias and environment directive/guide in terms of track train noise prediction, standard directive guide is more
It is suitable for noise prediction when train driving more, stationary radiant noise when platform is stopped at for train, the standard is simultaneously uncomfortable
With.Car body is mainly considered as point sound source or line source, the outer attenuation portions of vehicle, as Gaseous attenuation, ground are imitated by environment directive/guide
It should decay etc. and to be only applicable to traveling train noise forecast.When train is more than certain speed, noise phase that when stationary vehicle radiates
Noise when driving can be neglected, especially atmospheric attenuation part.Standard directive guide and environment directive/guide can not forecast vehicle
Noise when static.
Existing track train pass-by noise forecasts that common method includes FInite Element, statistical Energy Analysis Approach, boundary element method
Deng the business software that has of above method includes Ansys, VA One, Virtual.lab etc., but need to establish phase in Noise Exposure Forecast
The acoustic model answered, and in the track train design phase, mobile unit type has not determined, the noise source excitation load of model
It does not determine, mathematical modeling and load application etc. need to spend the extensive work time, and Modeling Calculation engineer need to grasp the above business
Software just can be carried out forecast；Ansys is relatively chiefly used in low frequency, and needs a large amount of acoustic mesh, and computational efficiency is low；And VA One compared with
It is chiefly used in calculating vehicle interior sound field, Virtual.lab is suitable for calculating vehicle outer sound field, overall sound pressure level when the vehicle outer sound field provided.
The prior art can not accomplish convenient, general in terms of Noise Exposure Forecast.
Therefore, a kind of outer stationary radiant noise quantitative forecast method and system of track train vehicle is needed, to solve existing skill
Art can not provide a kind of convenient, general Noise Exposure Forecast method, be forecast with the train steady state-noise to the design phase
The technical issues of.
Summary of the invention
In view of this, the embodiment of the present invention to be designed to provide a kind of noise based on equipment equivalent source quantitative pre-
Reporting method, a kind of convenient, general Noise Exposure Forecast method can not be provided by solving the prior art, with the train to the design phase
The technical issues of stationary state noise is forecast.
In a first aspect, the application is provided the following technical solutions by the embodiment of the application:
A kind of noise quantitative forecast method based on equipment equivalent sound source point, comprising: obtain over-the-counter observation point world coordinates
And open the corresponding origin world coordinates of local coordinate origin of equipment；Wherein, the unlatching equipment is to described over-the-counter
The equipment of observation point generation noise；The corresponding equivalent source of the unlatching equipment is obtained from equipment equivalent source point data base
Point acoustical power frequency spectrum and the corresponding equivalent sound source point local coordinate of the acquisition unlatching equipment, wherein the equipment equivalent source
It is included at least in point data base: the corresponding equivalent sound source point local coordinate of multiple unlatching equipment and equivalent sound source point sound
Power spectrum；According to the over-the-counter observation point world coordinates and the origin world coordinates, by the equivalent sound source point part
Coordinate is converted to equivalent sound source point world coordinates；It is global based on the over-the-counter observation point world coordinates and the equivalent sound source point
Coordinate obtains the relative position of over-the-counter observation point equivalent sound source point corresponding with the unlatching equipment；Based on the unlatching
The corresponding equivalent sound source point acoustical power frequency spectrum of equipment and the relative position calculate the unlatching equipment under semi-free state
First overall sound pressure level of corresponding equivalent sound source point appearance measuring point on the scene；Attenuation processing is carried out to first overall sound pressure level, is obtained
To the unlatching equipment second overall sound pressure level of the corresponding equivalent sound source point in the over-the-counter observation point in the mounted state；It is defeated
Second overall sound pressure level out.
In one embodiment, calculating unlatching equipment corresponding equivalent sound source point under semi-free state exists
First overall sound pressure level of over-the-counter observation point, comprising: according to acoustic propagation rule, be based on the corresponding equivalent source of the unlatching equipment
The relative position of point acoustical power frequency spectrum and over-the-counter observation point equivalent sound source point corresponding with the unlatching equipment, calculating are opened
The corresponding equivalent sound source point of equipment is opened in the first equivalent sound source point sound pressure level of the over-the-counter observation point；It is right according to simulating random series
The first equivalent sound source point sound pressure level carries out energy supposition, obtains first overall sound pressure level.
In one embodiment, described that energy supposition is carried out to the first equivalent sound source point sound pressure level, obtain described the
One overall sound pressure level, comprising: according to simulating random series, all first equivalent sound source point sound pressure levels for opening equipment to every carry out energy
Amount superposition obtains every and opens the corresponding equivalent sound source point of equipment in the first unlatching equipment sound pressure level of the over-the-counter observation point；
Equipment sound pressure level is opened to the first of all unlatching equipment and carries out energy supposition, obtains first overall sound pressure level.
In one embodiment, the equivalent of the unlatching equipment is obtained from equipment equivalent source point data base described
Before point source of sound acoustical power frequency spectrum and the acquisition equivalent sound source point local coordinate for opening equipment, further includes: set described in foundation
Standby equivalent source point data base comprising the steps of: the part for obtaining N number of measuring point around equipment where N number of measuring point microphone is sat
MarkAnd the actual measurement sound pressure level of N number of measuring point
Wherein, N > 1, N are positive integer；For the coordinate of j-th of measuring point；For the actual measurement sound pressure level of j-th of measuring point；?
Equipment surface or internal random determine the local coordinate of N number of equivalent sound source point and N number of equivalent sound source pointWherein,Respectively i-th equivalent sound source point
Coordinate；According to the local coordinate of the local coordinate of equivalent sound source point and measuring point, the phase of N number of equivalent sound source point and N number of measuring point is determined
To position R=[R11R12......R1N；R21R32......R2N；......；RN1RN2......RNN；], whereinWherein, RijFor i-th of equivalent sound source point and jth measuring point
Relative position；According to radiation law: LP=LW- 20lgR-8 is calculated, and the corresponding equivalent sound source point acoustical power of equipment is obtained
Frequency spectrumWherein, LPFor the actual measurement sound pressure level of N number of measuring point；For i-th equivalent sound source point
Equivalent sound source point acoustical power frequency spectrum；R is the relative position of N number of equivalent sound source point and N number of measuring point；The equipment is corresponding etc.
It imitates point source of sound local coordinate and equivalent sound source point acoustical power frequency spectrum saves, obtain the equipment equivalent source point data base.
In one embodiment, described to establish equipment equivalent source point data base, further comprise the steps of: setting tolerance；According to
Radiation law: LP=LW- 20lgR-8 obtains N number of equivalent sound source point in M where N number of measuring point and M verificating sensor
First forecast sound pressure level of check post and the first actual measurement sound pressure level, wherein LPFor the actual measurement sound pressure level of N number of measuring point；LWIt is N number of etc.
Imitate the equivalent sound source point acoustical power frequency spectrum of point source of sound；R is the relative position of N number of equivalent sound source point and N number of measuring point, and M is positive whole
Number；By the first forecast sound pressure level compared with the first actual measurement sound pressure level, judge difference whether within tolerance；If no
It is the equivalent sound source point acoustical power frequency spectrum for then recalculating the corresponding equivalent sound source point of equipment
And update the equipment equivalent source point data base.
In one embodiment, described that attenuation processing is carried out to first overall sound pressure level, comprising: from car body decaying number
The corresponding car body pad value of equipment is opened according to calling in library, wherein the car body attenuation data includes at least in library: Duo Gekai
Open the corresponding car body pad value of equipment；Obtain the outer pad value of vehicle for opening the equivalent sound source point appearance measuring point on the scene of equipment；
Based on pad value outside the car body pad value and/or the vehicle, attenuation processing is carried out to first overall sound pressure level.
Based on the same inventive concept, second aspect, the application provide following technical side by the embodiment of the application
Case:
A kind of noise quantitative forecast system based on equipment equivalent source, comprising:
First obtains module, corresponds to for obtaining over-the-counter observation point world coordinates and opening the local coordinate origin of equipment
Origin world coordinates；Wherein, the equipment of opening is the equipment for generating noise to the over-the-counter observation point；Second obtains
Modulus block, for obtaining the corresponding equivalent sound source point acoustical power frequency of the unlatching equipment from equipment equivalent source point data base
Compose and obtain the corresponding equivalent sound source point local coordinate of the unlatching equipment, wherein in the equipment equivalent source point data base
It includes at least: the corresponding equivalent sound source point local coordinate of multiple unlatching equipment and equivalent sound source point acoustical power frequency spectrum；
Conversion module is used for according to the over-the-counter observation point world coordinates and the origin world coordinates, will be described equivalent
Point source of sound local coordinate is converted to equivalent sound source point world coordinates；
Module is obtained, the over-the-counter observation point world coordinates and the equivalent sound source point world coordinates are based on, described in acquisition
The relative position of over-the-counter observation point equivalent sound source point corresponding with the unlatching equipment；
Computing module is based on the corresponding equivalent sound source point acoustical power frequency spectrum of unlatching equipment and the relative position, meter
Calculate first overall sound pressure level for opening equipment corresponding equivalent sound source point appearance measuring point on the scene under semi-free state；
Processing module obtains the unlatching equipment in installation shape for carrying out attenuation processing to first overall sound pressure level
Second overall sound pressure level of the corresponding equivalent sound source point in the over-the-counter observation point under state；
Output module, for exporting second overall sound pressure level.
Based on the same inventive concept, the third aspect, the application provide following technical side by the embodiment of the application
Case:
A kind of computer readable storage medium, is stored thereon with computer program, comprising: the program is executed by processor
When method and step described in any of the above-described embodiment may be implemented.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
Compared with prior art, in the embodiment of the present application, the unlatching for generating noise to the over-the-counter observation point is set
Standby to be equivalent to multiple equivalent sound source points, equivalent process is convenient and simple, has versatility to arbitrary noise source；It uses simultaneously
Simulating random series avoid the calculating of prior art very complicated, and a kind of convenient, general make an uproar can not be provided by solving the prior art
Sound forecasting procedure, the technical issues of forecast with the train steady state-noise to the design phase.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment
Attached drawing is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not to be seen as
It is the restriction to range, it for those of ordinary skill in the art, without creative efforts, can be with
Other relevant attached drawings are obtained according to these attached drawings.
Fig. 1 is the stream for the noise quantitative forecast method based on equipment equivalent sound source point that present pre-ferred embodiments provide
Cheng Tu；
Fig. 2 is the flow chart for establishing equipment equivalent source point data base that present pre-ferred embodiments provide；
Fig. 3 is the position view of global coordinate system and local coordinate system that present pre-ferred embodiments provide；
Fig. 4 is the over-the-counter observation point sound pressure level cloud atlas that present pre-ferred embodiments provide；
Fig. 5 is the function for being the noise quantitative forecast system based on equipment equivalent source that present pre-ferred embodiments provide
It can module diagram.
Specific embodiment
The embodiment of the present application solves existing by providing a kind of noise quantitative forecast method based on equipment equivalent source
There is technology that can not provide a kind of convenient, general Noise Exposure Forecast method, is carried out with the train steady state-noise to the design phase
The technical issues of forecast.
The technical solution of the embodiment of the present application is in order to solve the above technical problems, general thought is as follows:
A kind of noise quantitative forecast method based on equipment equivalent sound source point, comprising:
It obtains over-the-counter observation point world coordinates and opens the corresponding origin world coordinates of local coordinate origin of equipment；Its
In, the equipment of opening is the equipment for generating noise to the over-the-counter observation point；
Obtained from equipment equivalent source point data base the corresponding equivalent sound source point acoustical power frequency spectrum of the unlatching equipment and
Obtain the corresponding equivalent sound source point local coordinate of the unlatching equipment, wherein in the equipment equivalent source point data base at least
It include: the corresponding equivalent sound source point local coordinate of multiple unlatching equipment and equivalent sound source point acoustical power frequency spectrum；
According to the over-the-counter observation point world coordinates and the origin world coordinates, the equivalent sound source point is locally sat
Mark is converted to equivalent sound source point world coordinates；
Based on the over-the-counter observation point world coordinates and the equivalent sound source point world coordinates, the over-the-counter observation is obtained
The relative position of point equivalent sound source point corresponding with the unlatching equipment；
Based on the corresponding equivalent sound source point acoustical power frequency spectrum of unlatching equipment and the relative position, opened described in calculating
Open the first overall sound pressure level of equipment corresponding equivalent sound source point appearance measuring point on the scene under semi-free state；
Attenuation processing is carried out to first overall sound pressure level, it is corresponding etc. in the mounted state to obtain the unlatching equipment
Point source of sound is imitated in the second overall sound pressure level of the over-the-counter observation point；
Export second overall sound pressure level.
In order to better understand the above technical scheme, right in conjunction with appended figures and specific embodiments
Above-mentioned technical proposal is described in detail.
Illustrate first, herein presented term "and/or", only a kind of incidence relation for describing affiliated partner, table
Show there may be three kinds of relationships, for example, A and/or B, can indicate: individualism A exists simultaneously A and B, individualism B this
Three kinds of situations.In addition, character "/" herein, typicallys represent the relationship that forward-backward correlation object is a kind of "or".
Secondly illustrate: herein presented unlatching equipment is the equipment for generating noise to the over-the-counter observation point；This
The equipment occurred in text is the equipment that can generate noise to the over-the-counter observation point；A part that equipment is equipment is opened, is opened
Opening equipment is that equipment is in open state, and equipment further includes not opening equipment.
Embodiment one
This forecasting procedure can be used for track train, ship etc. there are in the field of noise, and the technical program is only with track
Train explains.
As shown in Figure 1, present embodiments providing a kind of noise quantitative forecast method based on equipment equivalent sound source point, wrap
It includes:
S101: obtaining over-the-counter observation point world coordinates and opens the corresponding origin overall situation seat of local coordinate origin of equipment
Mark；Wherein, the equipment of opening is the equipment for generating noise to the over-the-counter observation point；During actual implementation, outside the venue
Observation point world coordinates and origin world coordinates are directly inputted by user；
Over-the-counter observation point: the noise examination point chosen outside railway train body.Such as: residential area point.
S102: the corresponding equivalent sound source point acoustical power of the unlatching equipment is obtained from equipment equivalent source point data base
Frequency spectrum and the corresponding equivalent sound source point local coordinate of the acquisition unlatching equipment, wherein the equipment equivalent source point data base
In include at least: the corresponding equivalent sound source point local coordinate of multiple unlatching equipment and equivalent sound source point acoustical power frequency spectrum；
Equivalent sound source point: by the equipment for generating noise with multiple equivalent sound source points for being distributed in inside equipment or surface come
Substitution, can reflect the acoustics directive property of radiation of equipment noise well, such as the acoustical power frequency of the equivalent sound source point at blower disengaging
Compose it is larger, far from blower import and export equivalent sound source point acoustical power frequency spectrum it is smaller, replaced with conventional method with a sound source
One equipment is compared, and is avoided that the near field far field bigger than normal of the single sound source method of tradition problem less than normal.
During actual implementation, the device type and equipment size for opening equipment can be determined according to opening of device operating condition,
Then it is navigated in equipment equivalent source point data base according to the device type and equipment size of opening equipment and opens equipment
Data cell, then search the corresponding equivalent sound source point local coordinate of required unlatching equipment and equivalent sound source point acoustical power frequency
Spectrum.
In an alternative embodiment, as shown in Fig. 2, obtaining institute from equipment equivalent source point data base described
Before stating the equivalent sound source point acoustical power frequency spectrum for opening equipment and obtaining the equivalent sound source point local coordinate for opening equipment,
Further include: establish the equipment equivalent source point data base comprising the steps of:
Obtain the local coordinate of N number of measuring point around equipment where N number of measuring point microphoneAnd the actual measurement sound pressure level of N number of measuring pointIts
In, N > 1, N are positive integer；For the coordinate of j-th of measuring point；For the actual measurement sound pressure level of j-th of measuring point；
The local coordinate of N number of equivalent sound source point and N number of equivalent sound source point is determined in equipment surface or internal randomWherein,Respectively i-th equivalent sound source point
Coordinate；
According to the local coordinate of the local coordinate of equivalent sound source point and measuring point, N number of equivalent sound source point and N number of measuring point are determined
Relative position R=[R11R12......R1N；R21R32......R2N；......；RN1RN2......RNN；], whereinWherein, RijFor i-th of equivalent sound source point and jth measuring point
Relative position；
According to radiation law: LP=LW- 20lgR-8 is calculated, and the corresponding equivalent sound source point acoustical power of equipment is obtained
Frequency spectrumWherein, LPFor the actual measurement sound pressure level of N number of measuring point；For i-th equivalent sound source point etc.
Imitate point source of sound acoustical power frequency spectrum；R is the relative position of N number of equivalent sound source point and N measuring point；
Using coordinate conversion and hardstand semi-free field acoustic propagation principle, establish equivalent sound source point acoustical power frequency spectrum with
Measuring point surveys the relationship of sound pressure level, is randomly assigned N number of equivalent by iterative calculation by N number of measuring point coordinate and actual measurement sound pressure level
Point source of sound position obtains the size of N number of equivalent sound source point.By establishing the equivalent source point model of equipment, can reflect well
The acoustics directive property of radiation of equipment noise, the acoustical power frequency spectrum such as the equivalent sound source point at blower disengaging is larger, far from blower into
The acoustical power frequency spectrum of the equivalent sound source point in exit is smaller.In conventional method, whole equipment is considered as a sound source, with sound source
It is in the same size apart from consistent then acoustic pressure, the not directive property problem of energy conversion unit radiated noise, and equipment is bigger, single sound
It is more inaccurate to learn calculating.
In addition, the method that the present embodiment proposes the equivalent source point model of equipment, can establish any type of equipment and set
Standby acoustical power database, has versatility.It gives the correct time in advance in pass-by noise, calls the equivalent sound source point and respective counts for opening equipment
According to.
In an alternative embodiment, it further comprises the steps of: and judges the corresponding N number of equivalent sound source point acoustical power frequency of equipment
Whether spectrum is greater than 0；If it is not, then recalculating the equivalent sound source point acoustical power frequency spectrum of the corresponding equivalent sound source point of equipmentAnd the equipment equivalent source point data base is updated, by the corresponding equivalent source of the equipment
Point local coordinate and equivalent sound source point acoustical power frequency spectrum save, and obtain the equipment equivalent source point data base.Actual implementation
In the process, by the corresponding device type of equipment, equipment size, equivalent source point number, equivalent sound source point local coordinate, equivalent
Point source of sound acoustical power frequency spectrum is saved as a data cell, obtains equipment equivalent source point data base.
In an alternative embodiment, described to establish equipment equivalent source point data base, it further comprises the steps of:
Tolerance is set；
According to radiation law: LP=LW- 20lgR-8 obtains N number of equivalent sound source point in N number of measuring point and M verifying sensing
First forecast sound pressure level of M check post where device and the first actual measurement sound pressure level, wherein LPFor the actual measurement acoustic pressure of N number of measuring point
Grade；LWFor the equivalent sound source point acoustical power frequency spectrum of N number of equivalent sound source point；R is the opposite position of N number of equivalent sound source point and N number of measuring point
It sets, M is positive integer；
By the first forecast sound pressure level compared with the first actual measurement sound pressure level, judge difference whether within tolerance；If
It is not the equivalent sound source point acoustical power frequency spectrum for then recalculating the corresponding equivalent sound source point of equipment
And update the equipment equivalent source point data base.
During actual implementation, detection device equivalent sound source point can be gone to pass in M verifying by M verifying microphone
The actual measurement sound pressure level of sound device, and compare equipment equivalent sound source point in the predicted value of M check post, judge equipment equivalent sound source point
Correctness, the i.e. Reconstruction of Sound Field when it is accurate.In addition, N number of survey electric transducer can also be used to verifying equipment equivalent sound source point
Correctness.
During actual implementation, the equivalent sound source point for opening equipment can be obtained from equipment equivalent source point data base
Acoustical power frequency spectrum, the equivalent sound source point local coordinate for opening equipment.
S103: according to the over-the-counter observation point world coordinates and the origin world coordinates, by equivalent sound source point office
Portion's coordinate is converted to equivalent sound source point world coordinates；Such as: the origin world coordinates for opening equipment is 2,3,0；Open equipment
Equivalent sound source point local coordinate is -0.5,0.5,1, then equivalent sound source point world coordinates is 1.5,3.5,1.
S104: being based on the over-the-counter observation point world coordinates and the equivalent sound source point world coordinates, obtains described over-the-counter
The relative position of observation point equivalent sound source point corresponding with the unlatching equipment；Such as: over-the-counter observation point world coordinates is 10,
10,0；Equivalent sound source point world coordinates is 1.5,3.5,1；Then pass through relative position calculation formulaThe two relative position R=10.7 is calculated,For
I-th of equivalent sound source point world coordinates, XC、YC、ZCFor over-the-counter observation point world coordinates.
World coordinates refers to the coordinate under global coordinate system；Local coordinate refers to the coordinate under local coordinate system.Such as
Shown in Fig. 3, global coordinate system XYZ: for coordinate origin on railway train body, vehicle commander direction is X, vehicle width direction Y, root
According to right-handed scale (R.H.scale) principle, Z-direction vertically upward is determined.
Local coordinate system xiyizi: coordinate origin is i, the length direction of device coordinate with device numbering in equipment
For xi, width direction yi, according to right-handed scale (R.H.scale) principle, determine z vertically upwardiDirection.One track train has one
Global coordinate system, one or more local coordinate systems, the quantity of local coordinate system are to open the quantity of equipment.Black is small in figure
Point is the corresponding equivalent sound source point of equipment.
The it is proposed of local coordinate and world coordinates makes the technical program have versatility in Noise Exposure Forecast.Different tracks
The device location of train, device type, opening of device operating condition all may be different, when device location, device type, opening of device
When operating condition changes, it need to only re-enter over-the-counter observation point world coordinates and origin world coordinates and call and open equipment pair
The equivalent sound source point local coordinate answered can Fast Prediction again.If only with a kind of coordinate, it will encounter following two and ask
Topic:
If the equivalent sound source point of appearance measuring point, equipment and equipment is all sat using global on the spot 1, only with a kind of coordinate
Mark；As one can imagine needing the equivalent sound source point of each input field appearance measuring point, equipment and equipment when implementing the technical program
Coordinate, in order to the normal implementation of the technical program, but equivalent source point quantity is especially more, and workload is very big, it will leads
Cause the technical program practicability in implementation process too poor.
2, in addition, will overcome in 1 if the coordinate of the equivalent sound source point of over-the-counter observation point, equipment and equipment immobilizes
The problem of.At the same time, it may appear that it is not implementable to will lead to the technical program once coordinate changes for another problem.
And during actual implementation, the device location of different track trains, device type, opening of device operating condition all may be different, if this
Scheme uses a kind of coordinate, will lose versatility.
S105: being based on the corresponding equivalent sound source point acoustical power frequency spectrum of unlatching equipment and the relative position, calculates institute
State the first overall sound pressure level for opening equipment corresponding equivalent sound source point appearance measuring point on the scene under semi-free state；
Semi-free state: equipment single machine state, i.e. equipment is in equipment factory building, when being also not installed on track train
State.
In an alternative embodiment, described to calculate unlatching equipment corresponding equivalent sound under semi-free state
First overall sound pressure level of source point appearance measuring point on the scene, comprising:
According to acoustic propagation rule Lpi=Lwi-20lgRij- 8, based on the corresponding equivalent sound source point acoustical power frequency of unlatching equipment
Compose LwiAnd the relative position R of over-the-counter observation point equivalent sound source point corresponding with equipment is openedi, calculate that open equipment corresponding etc.
Imitate the first equivalent sound source point sound pressure level L of point source of sound appearance measuring point on the scenepi。 LwiFor i-th of equivalent sound source point acoustical power frequency spectrum,
RiFor the relative position of i-th equivalent sound source point and over-the-counter observation point, LpiFor i-th of equivalent sound source point appearance measuring point on the scene
First equivalent sound source point sound pressure level, wherein i=1,2,3 ..., NK.
It can be multiple for opening equipment, such as: equipment is opened in track train: tractive transformer, is led traction convertor
Draw motor cooling blower.Assuming that opening equipment is K platform, every unlatching equipment has N equivalent sound source point, then a total of N*K etc.
Imitate point source of sound, herein it is calculative be the N*K equivalent sound source point appearance measuring point on the scene that K platform opens equipment N*K a first
Equivalent sound source point sound pressure level Lpi(i=1,2,3 ..., NK), wherein K is positive integer.
According to simulating random series, to the first equivalent sound source point sound pressure level Lpi(i=1,2,3 ..., NK) carries out energy supposition,
Obtain the first overall sound pressure level LPtotal.With simulating random seriesAvoid prior art very complicated
It calculates, LPtotalFor the first overall sound pressure level of N*K equivalent sound source point appearance measuring point on the scene, Lpi(i=1,2,3 ..., NK) be
First equivalent sound source point sound pressure level of i-th of equivalent sound source point appearance measuring point on the scene.
In an alternative embodiment, described that energy supposition is carried out to the first equivalent sound source point sound pressure level, it obtains
First overall sound pressure level, comprising:
According to simulating random seriesN number of first equivalent sound source point acoustic pressure of equipment is opened to every
Grade Lpi(i=1,2,3 ..., N) carries out energy supposition, obtains the corresponding equivalent sound source point appearance measuring point on the scene of every unlatching equipment
First open equipment sound pressure level LK(k=1,2,3 ..., K)；Open equipment to K platform first opens equipment sound pressure level LK(k
=1,2,3 ..., K) carry out energy suppositionObtain the first overall sound pressure level LPtotal。
During actual implementation, the first unlatching equipment sound pressure level L that K platform opens equipment can also be calculated separatelyK(k=1,
2,3 ..., K) and the first overall sound pressure level LPtotalIt determines ratio, determines the Noise contribution percentage of every unlatching equipmentThe equivalent sound source point of every equipment is to over-the-counter observation point all amounts of contributing, outside the venue
The final noise level of observation point be all equivalent sound source points of all devices to the energy supposition of Exterior radiation noise and, can divide
The corresponding equivalent source of every equipment is not calculated to the contribution amount and percentage contribution of pass-by noise, in order to equipment into
Row sequence, provides guide for noise abatement, if a certain site noise is exceeded, need to only pay close attention to the spot noise contribution amount
Maximum equipment.As shown in the table, X, Y, Z are over-the-counter observation point world coordinates.
| X | Y | Z | Traction electric machine cooling blower | Air-conditioning | Tractive transformer | Total value |
| -6.4 | -3.75 | 1.2 | 66.8187 | 56.7762 | 65.1605 | 69.3269 |
| -3.3 | -3.75 | 1.2 | 63.4408 | 58.4955 | 68.4976 | 69.9962 |
| 2.02 | -3.75 | 1.2 | 59.1751 | 62.4269 | 70.6847 | 71.5483 |
| 6.35 | -3.75 | 1.2 | 56.6988 | 66.9828 | 66.1674 | 69.8215 |
| -10 | -7.5 | 1.2 | 63.7846 | 54.6946 | 60.8404 | 65.9091 |
| -5 | -7.5 | 1.2 | 62.1209 | 56.8071 | 63.6712 | 66.4717 |
| 0 | -7.5 | 1.2 | 59.2635 | 59.3754 | 65.4744 | 67.1911 |
| 5 | -7.5 | 1.2 | 56.7131 | 62.2265 | 64.1658 | 66.7656 |
| 10 | -7.5 | 1.2 | 54.6171 | 63.7846 | 61.3851 | 66.0805 |
From table it can be seen that, traction electric machine cooling blower, air-conditioning, every equipment of tractive transformer Noise contribution
With over-the-counter observation spot noise total value.By lateral comparison, it can determine in three unlatching equipment that Noise contribution is maximum and set
It is standby.
In addition, also sound pressure level cloud atlas can be established by programming, as shown in figure 4, Fig. 4 is the corresponding sound pressure level cloud atlas of upper table,
Cube represents train simplified model, and slice cloud atlas represents the sound pressure level of different over-the-counter observation points, and rectangular block represents different colours pair
Different sound pressure levels is answered, sound pressure level gradually increases from lower to upper.From the figure, it can be seen that on same plane Z=1.2
For over-the-counter observation point, the corresponding color of slice cloud atlas closer to plane Y=0 has bigger sound pressure level, i.e. plane Y=-
Over-the-counter observation point on 3.75 has bigger sound pressure level than plane Y=-7.5；In the intersection of plane Z=1.2 and Y=-7.5
On line, the smallest over-the-counter observation point of sound pressure level is the corresponding point of X=-10；Sound pressure level cloud atlas can intuitively show over-the-counter any observation
The larger and smaller position of noise of point can be visually seen noise profile rule, and any position acoustic pressure convenient for non-acoustic professional scholar
Grade is based on calculated value non-fitting curve.
S106: attenuation processing is carried out to first overall sound pressure level, the unlatching equipment is obtained and corresponds in the mounted state
Equivalent sound source point the over-the-counter observation point the second overall sound pressure level；
As a kind of optional embodiment, attenuation processing is carried out to the first overall sound pressure level, comprising:
The corresponding car body pad value of equipment is opened firstly, calling from car body attenuation data library, wherein car body decaying number
According to being included at least in library: multiple corresponding car body pad values of unlatching equipment.It, can be according to unlatching during actual implementation
The corresponding device type of equipment and equipment size navigate to the data cell for opening equipment, then root in car body attenuation data library
The corresponding car body pad value of unlatching equipment needed for being searched according to the car body model where opening equipment.During actual implementation,
Data cell of the car body model in car body attenuation data library can first be navigated to, further according to open equipment device type, set
Standby size searches and opens the corresponding car body pad value of equipment.Different car body models are different the decaying of same equipment, example
Such as: standard EMU 250, standard EMU 350 are different the decaying of traction electric machine cooling blower；Same car body is to setting
The decaying of standby two equipment that type is identical but equipment size is different is different, such as: standard EMU 250 to having a size of
The traction electric machine cooling blower of 30*30*10 and the traction electric machine cooling blower having a size of 60*50*20 are different.It obtains
Open the outer pad value of vehicle of the equivalent sound source point appearance measuring point on the scene of equipment；The outer pad value of vehicle be mainly derived from outside temperature,
Atmospheric pressure etc. has decaying to noise.What is calculated in the present embodiment is decayed outside vehicle that all equivalent sound source points show up appearance measuring point
Average value, with that, using entire car body as a sound source, atmosphere can be calculated more accurately in conventional method and declined to noise
Subtract.Then, based on car body pad value and/or the outer pad value of vehicle, attenuation processing is carried out to the first overall sound pressure level.
As a kind of optional embodiment, the corresponding car body decaying of equipment is opened calling from car body attenuation data library
Before value, further includes: establish car body attenuation data library comprising the steps of:
Obtain the second forecast sound pressure level of equipment corresponding equivalent sound source point appearance measuring point on the scene under semi-free state；
The second forecast sound pressure level not comprising car body is that equipment equivalent sound source point is calculated according to acoustic propagation rule and simulating random series
's.Obtain the second actual measurement sound pressure level of equipment appearance measuring point on the scene；It is measured by the sound pressure sensor of appearance point layout on the scene
Second actual measurement sound pressure level.The difference for determining the second forecast sound pressure level with the second actual measurement sound pressure level, obtains car body to the car body of equipment
Pad value；The corresponding car body pad value of equipment is saved, car body model, device type, equipment size, car body pad value save,
Obtain car body attenuation data library.The car body attenuation data library of every class equipment is established, convenient for calling when Noise Exposure Forecast.
In the train design phase, designer can distribute acoustical power index to equipment, it is then assumed that the various of train set
Standby assembled scheme, and sound pressure level forecast is carried out to various assembled schemes, judge that the noise that point (over-the-counter observation point) is examined outside vehicle is
It is no exceeded, and then instruct noise of equipment Distribution Indexes, it be track train overall design unit is that every equipment divides acoustical power index
Data are provided to support.
S107: output second overall sound pressure level.The way of output can be table, image, audio etc., not limit herein
System.
Technical solution in above-mentioned the embodiment of the present application, at least have the following technical effects or advantages:
Compared with prior art, in the embodiment of the present application, the unlatching for generating noise to the over-the-counter observation point is set
Standby to be equivalent to multiple equivalent sound source points, equivalent process is convenient and simple, has versatility to arbitrary noise source；It uses simultaneously
Simulating random series avoid the calculating of prior art very complicated, and a kind of convenient, general make an uproar can not be provided by solving the prior art
Sound forecasting procedure, the technical issues of forecast with the train steady state-noise to the design phase.
Embodiment two
Based on the same inventive concept, as shown in figure 5, present embodiments providing a kind of noise based on equipment equivalent source
Quantitative forecast system, comprising:
First obtains module 201, for obtaining over-the-counter observation point world coordinates and opening the local coordinate origin pair of equipment
The origin world coordinates answered；Wherein, the equipment of opening is the equipment for generating noise to the over-the-counter observation point；
Second obtains module 202, corresponding etc. for obtaining the unlatching equipment from equipment equivalent source point data base
It imitates point source of sound acoustical power frequency spectrum and obtains the corresponding equivalent sound source point local coordinate of the unlatching equipment, wherein described equipment etc.
It is included at least in effect sound source point data base: the corresponding equivalent sound source point local coordinate of multiple unlatching equipment and equivalent sound
Source point acoustical power frequency spectrum；
Conversion module 203 is used for according to the over-the-counter observation point world coordinates and the origin world coordinates, will be described
Equivalent sound source point local coordinate is converted to equivalent sound source point world coordinates；
Module 204 is obtained, the over-the-counter observation point world coordinates and the equivalent sound source point world coordinates are based on, is obtained
The relative position of over-the-counter observation point equivalent sound source point corresponding with the unlatching equipment；
Computing module 205, based on the corresponding equivalent sound source point acoustical power frequency spectrum of the unlatching equipment and the opposite position
It sets, calculates first overall sound pressure level for opening equipment corresponding equivalent sound source point appearance measuring point on the scene under semi-free state；
Processing module 206 obtains the unlatching equipment and is pacifying for carrying out attenuation processing to first overall sound pressure level
Second overall sound pressure level of the corresponding equivalent sound source point in the over-the-counter observation point under dress state；
Output module 207, for exporting second overall sound pressure level.
As a kind of optional embodiment, computing module 205, comprising:
Computational submodule, for being based on the corresponding equivalent sound source point acoustical power of the unlatching equipment according to acoustic propagation rule
The relative position of frequency spectrum and over-the-counter observation point equivalent sound source point corresponding with the unlatching equipment, calculates and opens equipment pair
First equivalent sound source point sound pressure level of the equivalent sound source point answered in the over-the-counter observation point；
It is superimposed submodule, for carrying out energy supposition to the first equivalent sound source point sound pressure level according to simulating random series,
Obtain first overall sound pressure level.
As a kind of optional embodiment, it is superimposed submodule and is used for:
According to simulating random series, all first equivalent sound source point sound pressure levels for opening equipment to every carry out energy supposition, obtain
The corresponding equivalent sound source point of equipment, which is opened, to every opens equipment sound pressure level the first of the over-the-counter observation point；
Equipment sound pressure level is opened to the first of all unlatching equipment and carries out energy supposition, obtains described first total acoustic pressure
Grade.
As a kind of optional embodiment, further includes: first database establishes module, for from equipment equivalent source
The equivalent sound source point acoustical power frequency spectrum for opening equipment and the equivalent sound source point office for opening equipment are obtained in point data base
Before portion's coordinate, the equipment equivalent source point data base is established, comprising the following steps:
Obtain the local coordinate of N number of measuring point around equipment where N number of measuring point microphoneAnd the actual measurement sound pressure level of N number of measuring pointIts
In, N > 1, N are positive integer；For the coordinate of j-th of measuring point；For the actual measurement sound pressure level of j-th of measuring point；
The local coordinate of N number of equivalent sound source point and N number of equivalent sound source point is determined in equipment surface or internal randomWherein,Respectively i-th equivalent sound source point
Coordinate；
According to the local coordinate of the local coordinate of equivalent sound source point and measuring point, N number of equivalent sound source point and N number of measuring point are determined
Relative position R=[R11R12......R1N；R21R32......R2N；......；RN1RN2......RNN；], whereinWherein, RijFor i-th of equivalent sound source point and jth measuring point
Relative position；
According to radiation law: LP=LW- 20lgR-8 is calculated, and the corresponding equivalent sound source point acoustical power of equipment is obtained
Frequency spectrumWherein, LPFor the actual measurement sound pressure level of N number of measuring point；For i-th equivalent sound source point etc.
Imitate point source of sound acoustical power frequency spectrum；R is the relative position of N number of equivalent sound source point and N measuring point；
The corresponding equivalent sound source point local coordinate of the equipment and equivalent sound source point acoustical power frequency spectrum are saved, institute is obtained
State equipment equivalent source point data base.
As a kind of optional embodiment, first database establishes module, is also used to:
Tolerance is set；
According to radiation law: LP=LW- 20lgR-8 obtains N number of equivalent sound source point in N number of measuring point and M verifying sensing
First forecast sound pressure level of M check post where device and the first actual measurement sound pressure level, wherein LPFor the actual measurement acoustic pressure of N number of measuring point
Grade；LWFor the equivalent sound source point acoustical power frequency spectrum of N number of equivalent sound source point；R is the opposite position of N number of equivalent sound source point and N number of measuring point
It sets, M is positive integer；
By the first forecast sound pressure level compared with the first actual measurement sound pressure level, judge difference whether within tolerance；
If it is not, then recalculating the equivalent sound source point acoustical power frequency spectrum of the corresponding equivalent sound source point of equipmentAnd update the equipment equivalent source point data base.
As a kind of optional embodiment, processing module 206, comprising:
Submodule is called, opens the corresponding car body pad value of equipment for calling from car body attenuation data library, wherein
The car body attenuation data includes at least in library: multiple corresponding car body pad values of unlatching equipment；
Acquisition submodule, for obtaining pad value outside the vehicle for opening the equivalent sound source point appearance measuring point on the scene of equipment；
Submodule is handled, for being based on the car body pad value and/or the outer pad value of the vehicle, to described first total sound
It arbitrarily downgrades and carries out attenuation processing.
As a kind of optional embodiment, further includes: the second Database module is used for from car body attenuation data library
Before middle calling opens the corresponding car body pad value of equipment, car body attenuation data library is established.
It is described to establish car body attenuation data library during actual implementation, comprising:
Obtain the second forecast sound pressure level of equipment corresponding equivalent sound source point appearance measuring point on the scene under semi-free state；
The second forecast sound pressure level not comprising car body is that equipment equivalent sound source point is calculated according to acoustic propagation rule and simulating random series
's；Obtain the second actual measurement sound pressure level of equipment appearance measuring point on the scene；It is measured by the sound pressure sensor of appearance point layout on the scene
Second actual measurement sound pressure level；The difference for determining the second forecast sound pressure level with the second actual measurement sound pressure level, obtains car body to the car body of equipment
Pad value；The corresponding car body pad value of equipment is saved, car body attenuation data library is obtained.Herein, the car body of every class equipment is established
Attenuation data library, convenient for being called when Noise Exposure Forecast.
Technical solution in above-mentioned the embodiment of the present application, at least have the following technical effects or advantages: and the prior art
It compares, in the embodiment of the present application, the unlatching equipment for generating noise to the over-the-counter observation point is equivalent to multiple equivalent sounds
Source point, equivalent process is convenient and simple, has versatility to arbitrary noise source；Simulating random series are used simultaneously, avoid existing skill
The calculating of art very complicated, a kind of convenient, general Noise Exposure Forecast system can not be provided by solving the prior art, to design
The technical issues of train steady state-noise in stage is forecast.
Embodiment three
Based on the same inventive concept, a kind of computer readable storage medium is present embodiments provided, calculating is stored thereon with
Machine program, performs the steps of when computer program is executed by processor
It obtains over-the-counter observation point world coordinates and opens the corresponding origin world coordinates of local coordinate origin of equipment；Its
In, the equipment of opening is the equipment for generating noise to the over-the-counter observation point；
Obtained from equipment equivalent source point data base the corresponding equivalent sound source point acoustical power frequency spectrum of the unlatching equipment and
Obtain the corresponding equivalent sound source point local coordinate of the unlatching equipment, wherein in the equipment equivalent source point data base at least
It include: the corresponding equivalent sound source point local coordinate of multiple unlatching equipment and equivalent sound source point acoustical power frequency spectrum；
According to the over-the-counter observation point world coordinates and the origin world coordinates, the equivalent sound source point is locally sat
Mark is converted to equivalent sound source point world coordinates；
Based on the over-the-counter observation point world coordinates and the equivalent sound source point world coordinates, the over-the-counter observation is obtained
The relative position of point equivalent sound source point corresponding with the unlatching equipment；
Based on the corresponding equivalent sound source point acoustical power frequency spectrum of unlatching equipment and the relative position, opened described in calculating
Open the first overall sound pressure level of equipment corresponding equivalent sound source point appearance measuring point on the scene under semi-free state；
Attenuation processing is carried out to first overall sound pressure level, it is corresponding etc. in the mounted state to obtain the unlatching equipment
Point source of sound is imitated in the second overall sound pressure level of the over-the-counter observation point；
Export second overall sound pressure level.
In the specific implementation process, when which is executed by processor, any reality in above-described embodiment one may be implemented
Apply mode.
In several embodiments provided herein, it should be understood that disclosed device and method can also lead to
Other modes are crossed to realize.The apparatus embodiments described above are merely exemplary, for example, the flow chart in attached drawing and
Block diagram shows the system in the cards of the device of multiple embodiments according to the present invention, method and computer program product
Framework, function and operation.In this regard, each box in flowchart or block diagram can represent a module, program segment or generation
A part of code, a part of module, section or code include it is one or more it is for implementing the specified logical function can
It executes instruction.It should also be noted that function marked in the box can also be with not in some implementations as replacement
It is same as the sequence marked in attached drawing generation.For example, two continuous boxes can actually be basically executed in parallel, they
Sometimes it can also execute in the opposite order, this depends on the function involved.It is also noted that block diagram and or flow chart
In each box and the box in block diagram and or flow chart combination, can as defined in executing function or movement
Dedicated hardware based system is realized, or can be realized using a combination of dedicated hardware and computer instructions.
In addition, each functional module in each embodiment of the present invention can integrate one independent portion of formation together
Point, it is also possible to modules individualism, an independent part can also be integrated to form with two or more modules.
If the methodological function in the present invention realized in the form of software function module and as independent product sale or
In use, can store in a computer readable storage medium.Based on this understanding, technical solution of the present invention
Substantially the part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words
It embodies, which is stored in a storage medium, including some instructions are used so that a computer
Equipment (can be personal computer, server or the network equipment etc.) execute each embodiment method of the present invention whole or
Part steps.And storage medium above-mentioned include: USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory),
Random access memory (RAM, Random Access Memory), magnetic or disk etc. are various to can store program code
Medium.It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, without necessarily requiring or implying between these entities or operation
There are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to
Cover non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", not
There is also other identical elements in the process, method, article or equipment for including element for exclusion.
These are only the preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.It should also be noted that similar label and letter are under
Similar terms are indicated in the attached drawing in face, therefore, once being defined in a certain Xiang Yi attached drawing, are then not required in subsequent attached drawing
It is further defined and explained.
More than, only a specific embodiment of the invention, but scope of protection of the present invention is not limited thereto, and it is any ripe
It knows those skilled in the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, should all cover
Within protection scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (8)
1. a kind of noise quantitative forecast method based on equipment equivalent sound source point characterized by comprising
It obtains over-the-counter observation point world coordinates and opens the corresponding origin world coordinates of local coordinate origin of equipment；Wherein, institute
Stating and opening equipment is the equipment for generating noise to the over-the-counter observation point；
The corresponding equivalent sound source point acoustical power frequency spectrum of the unlatching equipment and acquisition are obtained from equipment equivalent source point data base
The corresponding equivalent sound source point local coordinate of the unlatching equipment, wherein included at least in the equipment equivalent source point data base:
The corresponding equivalent sound source point local coordinate of multiple unlatching equipment and equivalent sound source point acoustical power frequency spectrum；
According to the over-the-counter observation point world coordinates and the origin world coordinates, the equivalent sound source point local coordinate is converted
For equivalent sound source point world coordinates；
Based on the over-the-counter observation point world coordinates and the equivalent sound source point world coordinates, the over-the-counter observation point and institute are obtained
State the relative position for opening the corresponding equivalent sound source point of equipment；
Based on the corresponding equivalent sound source point acoustical power frequency spectrum of unlatching equipment and the relative position, the unlatching equipment is calculated
The first overall sound pressure level of corresponding equivalent sound source point appearance measuring point on the scene under semi-free state；
Attenuation processing is carried out to first overall sound pressure level, obtains the unlatching equipment corresponding equivalent source in the mounted state
Second overall sound pressure level of the point in the over-the-counter observation point；
Export second overall sound pressure level.
2. the method as described in claim 1, which is characterized in that the calculating unlatching equipment is corresponding under semi-free state
Equivalent sound source point appearance measuring point on the scene the first overall sound pressure level, comprising:
According to acoustic propagation rule, it is based on the corresponding equivalent sound source point acoustical power frequency spectrum of the unlatching equipment and the over-the-counter observation point
The relative position of equivalent sound source point corresponding with the unlatching equipment calculates and opens the corresponding equivalent sound source point of equipment in the field
First equivalent sound source point sound pressure level of appearance measuring point；
According to simulating random series, energy supposition is carried out to the first equivalent sound source point sound pressure level, obtains first overall sound pressure level.
3. method according to claim 2, which is characterized in that described to carry out energy to the first equivalent sound source point sound pressure level
Superposition, obtains first overall sound pressure level, comprising:
According to simulating random series, all first equivalent sound source point sound pressure levels for opening equipment to every carry out energy supposition, obtain every
Platform opens the corresponding equivalent sound source point of equipment and opens equipment sound pressure level the first of the over-the-counter observation point；
Equipment sound pressure level is opened to the first of all unlatching equipment and carries out energy supposition, obtains first overall sound pressure level.
4. the method as described in claim 1, which is characterized in that it is described from equipment equivalent source point data base obtain described in
Before opening the equivalent sound source point acoustical power frequency spectrum of equipment and obtaining the equivalent sound source point local coordinate for opening equipment, also wrap
It includes: establishing the equipment equivalent source point data base comprising the steps of:
Obtain the local coordinate of N number of measuring point around equipment where N number of measuring point microphone
And the actual measurement sound pressure level L of N number of measuring pointP=[Lp1；Lp2......LpN]；Wherein, N is positive integer；It is surveyed for j-th
The coordinate of point；For the actual measurement sound pressure level of j-th of measuring point；
The local coordinate of N number of equivalent sound source point and N number of equivalent sound source point is determined in equipment surface or internal randomWherein,Yi E、The coordinate of respectively i-th equivalent sound source point；
According to the local coordinate of the local coordinate of equivalent sound source point and measuring point, determine that N number of equivalent sound source point is opposite with N number of measuring point
Position R=[R11R12......R1N；R21R32......R2N；......；RN1RN2......RNN；], whereinWherein, RijFor the phase of i-th equivalent sound source point and j-th of measuring point
To position；
According to radiation law: LP=LW- 20lgR-8 is calculated, and the corresponding equivalent sound source point acoustical power frequency spectrum of equipment is obtainedWherein, LPFor the actual measurement sound pressure level of N number of measuring point；For the equivalent of i-th equivalent sound source point
Point source of sound acoustical power frequency spectrum；R is the relative position of N number of equivalent sound source point and N number of measuring point；
The corresponding equivalent sound source point local coordinate of the equipment and equivalent sound source point acoustical power frequency spectrum are saved, described set is obtained
Standby equivalent source point data base.
5. method as claimed in claim 4, which is characterized in that it is described to establish equipment equivalent source point data base, it further include step
It is rapid:
Tolerance is set；
According to radiation law: LP=LW- 20lgR-8 obtains N number of equivalent sound source point in N number of measuring point and M verificating sensor institute
M check post first forecast sound pressure level and first actual measurement sound pressure level, wherein LPFor the actual measurement sound pressure level of N number of measuring point；LW
For the equivalent sound source point acoustical power frequency spectrum of N number of equivalent sound source point；R is the relative position of N number of equivalent sound source point and N number of measuring point, and M is
Positive integer；
By the first forecast sound pressure level compared with the first actual measurement sound pressure level, judge difference whether within tolerance；
If it is not, then recalculating the equivalent sound source point acoustical power frequency spectrum of the corresponding equivalent sound source point of equipment
And update the equipment equivalent source point data base.
6. the method as described in claim 1, which is characterized in that described to carry out attenuation processing, packet to first overall sound pressure level
It includes:
It is called from car body attenuation data library and opens the corresponding car body pad value of equipment, wherein in car body attenuation data library
It includes at least: multiple corresponding car body pad values of unlatching equipment；
Obtain the outer pad value of vehicle for opening the equivalent sound source point appearance measuring point on the scene of equipment；
Based on pad value outside the car body pad value and/or the vehicle, attenuation processing is carried out to first overall sound pressure level.
7. a kind of noise quantitative forecast system based on equipment equivalent source characterized by comprising
First obtains module, for obtaining over-the-counter observation point world coordinates and opening the corresponding origin of local coordinate origin of equipment
World coordinates；Wherein, the equipment of opening is the equipment for generating noise to the over-the-counter observation point；
Second obtains module, for obtaining the corresponding equivalent sound source point of the unlatching equipment from equipment equivalent source point data base
Acoustical power frequency spectrum and the corresponding equivalent sound source point local coordinate of the acquisition unlatching equipment, wherein the equipment equivalent sound source point
It is included at least in database: the corresponding equivalent sound source point local coordinate of multiple unlatching equipment and equivalent sound source point acoustical power
Frequency spectrum；
Conversion module is used for according to the over-the-counter observation point world coordinates and the origin world coordinates, by the equivalent source
Point local coordinate is converted to equivalent sound source point world coordinates；
Module is obtained, the over-the-counter observation point world coordinates and the equivalent sound source point world coordinates are based on, is obtained described over-the-counter
The relative position of observation point equivalent sound source point corresponding with the unlatching equipment；
Computing module is based on the corresponding equivalent sound source point acoustical power frequency spectrum of unlatching equipment and the relative position, calculates institute
State the first overall sound pressure level for opening equipment corresponding equivalent sound source point appearance measuring point on the scene under semi-free state；
Processing module obtains the unlatching equipment in the mounted state for carrying out attenuation processing to first overall sound pressure level
Second overall sound pressure level of the corresponding equivalent sound source point in the over-the-counter observation point；
Output module, for exporting second overall sound pressure level.
8. a kind of computer readable storage medium, is stored thereon with computer program characterized by comprising the program is located
The method and step as described in any claim of claim 1~6 may be implemented in reason device when executing.
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