CN110083988A - A kind of characteristics of ship underwater radiation noise appraisal procedure - Google Patents
A kind of characteristics of ship underwater radiation noise appraisal procedure Download PDFInfo
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- CN110083988A CN110083988A CN201910428667.4A CN201910428667A CN110083988A CN 110083988 A CN110083988 A CN 110083988A CN 201910428667 A CN201910428667 A CN 201910428667A CN 110083988 A CN110083988 A CN 110083988A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/15—Vehicle, aircraft or watercraft design
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The present invention is to provide a kind of characteristics of ship underwater radiation noise appraisal procedures.1, boat length, lectotype selection and the total number, equipment of input ship conceptual scheme are away from stem distance；2, the exciting force of equipment centroid position is identified；3, the stand-alone device far field underwater radiation noise sound source level and frequency band sound source level of Ship '；4, at Ship ' transverse direction a meters by stem to the overall level of stern each point, draw acoustic pressure along hull longitudinal distribution curve as ship by characteristic curve, determine the equivalent acoustic centre of source of ship；5, characteristics of ship underwater radiation noise sound source level, frequency band sound source level and spectra of sound pressure source level are estimated；6, the obtained parameter of step 5 and design requirement limit value are compared, obtains characteristics of ship underwater radiation noise parameter demonstration assessment result.The present invention can estimate the far field sound pressure value of ship under running working condition according to demonstration stage ship conceptual scheme, and limit value carries out demonstration assessment to it according to demand.
Description
Technical field
The present invention relates to a kind of vibration reduction of ship noise reduction technology, specifically a kind of underwater radiation noise assessment side
Method.
Background technique
Characteristics of ship underwater radiation noise index is mainly used for describing the superiority and inferiority of vibration reduction of ship noise reduction measure resultant effect, measures ship
Oceangoing ship is by the distance of passive sonar detection detective distance.For example, when underwater radiation noise overall level is reduced to 140 decibels by 150 decibels,
If considering the detection of sonar full frequency band, ship will shorten to original detection range by the distance of passive sonar detection discovery
23%.
Far field sound pressure that the underwater radiation noise index of ship excites in water generally according to ship is assessed and is examined.Institute
Far field is called, is span ship-set a distance and the position that ship can be considered as to a point.Current at home and abroad pertinent literature or money
There is not yet related characteristics of ship underwater radiation noise proves the report of study on assessing method in material.It is ground in Ship Vibration Noise Exposure Forecast method
Aspect is studied carefully, although having the method for some maturations, such as FInite Element, boundary element method and statistical Energy Analysis Approach are Ship Vibration noise-induced
Can forecast analysis provide theoretical foundation (Wang Xu Zhangming, Wang Yu, the macro magnitude of China, the modeling of Ship Structure and underwater vibration and
The FEM/BEM of radiated noise is calculated, Ship Mechanics SUM, the phase of volume 64, p89~95,2008), but these methods exist to ship parameter
The demanding problem of oneself degree of knowing, the parameters such as structural drawings, equipment deployment scenarios of analysis pair need to be obtained in forecast analysis.So
And in the demonstration stage, the conceptual scheme of ship is more rough, only the parameters such as tonnage, out to out and preliminary lectotype selection, nothing
Method is assessed according to the demonstration that existing method carries out characteristics of ship underwater radiation noise index.
Summary of the invention
The purpose of the present invention is to provide a kind of characteristics of ship underwater radiation noise appraisal procedures of quantization.
The object of the present invention is achieved like this:
Step 1, input boat length l, lectotype selection and the equipment total number N of ship conceptual scheme, equipment away from stem away from
From li；
Step 2, the exciting force for going out equipment centroid position using equipment motivation source load identification formulas solutions；
Step 3 is radiated under water using the stand-alone device far field of ship stand-alone device underwater radiation noise formula Ship '
Sound source level LPkWith frequency band sound source level LPkm(ω)；
Step 4, using at a meters of Ship ' transverse direction of multi-source energy supposition formula by stem to the overall level of stern each point,
Draw acoustic pressure along hull longitudinal distribution curve as ship by characteristic curve, determine the equivalent acoustic centre of source of ship；
Step 5 utilizes sound source level calculation formula estimation characteristics of ship underwater radiation noise sound source level, frequency band sound source level and spectra of sound pressure
Source level；
Step 6 by the obtained characteristics of ship underwater radiation noise sound source level of step 5, frequency band sound source level, spectra of sound pressure source level and is set
Meter demand limit compares, and obtains characteristics of ship underwater radiation noise parameter demonstration assessment result.
The present invention may also include:
1. frequency band sound source level L described in step 3Pkm(ω) and sound source level LPkIt indicates are as follows:
Wherein, M is the total number of frequency band, P0For reference sound pressure, Fkm(ω) is m-th of frequency at k-th of equipment centroid position
The exciting force of leukorrhagia, TkThe transmission function of (ω) between equipment motivation power and equipment single machine radiated noise acoustic pressure, passes through parent form
The pier mooring test of ship measures:
Tk(ω)=Pk(ω)/fk(ω)
In formula, fk(ω) is exciting force at k-th of the equipment measured on parent ship, Pk(ω) is to measure on parent ship
K-th of equipment generate single machine radiated noise equivalent sound pressure.
2. utilizing at a meters of Ship ' transverse direction of multi-source energy supposition formula by stem to total sound of j-th of sound field point of ship stern
Grade PjWith sound control Pj(ω) is indicated are as follows:
Wherein, N is equipment total number, ljIndicate the fore-and-aft distance between j-th of sound field point and stem, lkIndicate k-th of equipment
Fore-and-aft distance between stem.
3. utilizing the characteristics of ship underwater radiation noise sound source level L of sound source level calculation formula estimationP、LP(ω) and spectra of sound pressure source level
LPs(ω) is respectively indicated are as follows:
LP=max (Pj)
LP(ω)=max (Pj(ω))
LPs(ω)=LP(ω)-10logΔω
Wherein, △ ω is the bandwidth that center frequency is ω.
4.P0=1 μ Pa.
The present invention provides a kind of characteristics of ship underwater radiation noise appraisal procedures of quantization, can be general according to demonstration stage ship
The scheme of thought estimates the far field sound pressure value of ship under running working condition, thus propose the underwater radiation noise sound source level of novel ship,
The indexs such as frequency band sound source level and spectra of sound pressure source level, and it is assessed according to design requirement limit value.
Beneficial effects of the present invention: the method for the present invention is simple and easy, overcomes current Ship Radiated-Noise parameter demonstration work
The uncertainty that " artificial experience " method conclusion is used in work, without carrying out modeling and simulating according to hull structural design drawing,
To master hull out to out parameter and lectotype selection result just can be obtained the underwater radiation noise value of ship, and by with design
Demand limit compares to obtain the assessment result of characteristics of ship underwater radiation noise index, relative to the ship currently based on " artificial experience "
Vibration and noise reducing parameter demonstration method is greatly improved reasonability and accuracy that characteristics of ship underwater radiation noise proves result.
Detailed description of the invention
Fig. 1 is characteristics of ship underwater radiation noise parameter demonstration appraisal procedure flow chart.
Fig. 2 is that the equivalent acoustic centre of source of ship determines schematic diagram, in which: 1 is the equivalent acoustic centre of source；2 be ship；3 be equipment；4 are
Lateral sound field site；Pass through characteristic curve subject to 5.
Fig. 3 is characteristics of ship underwater radiation noise frequency band sound source level parameter demonstration assessment figure, in which: 1 estimates for frequency band sound source level
As a result；2 be frequency band sound source level limit value line.
Specific embodiment
It illustrates below and the present invention is described in more detail.
1, according to demonstration stage ship conceptual scheme, determine length over all l, equipment total number N, k-th of equipment away from ship
Bow distance lkAnd its under-chassis vibration acceleration response characteristic Xk(ω)；
2, identify that formula calculates the exciting force F of equipment centroid position according to equipment motivation source loadk(ω)
Fk(ω)=Hk(ω)-1Xk(ω)
In formula, ω is frequency, Hk(ω) is vibration acceleration frequency response transfer function matrix of the equipment mass center to under-chassis, generally
The numerical simulation calculation method for being taken based on finite element acquires:
Hki(ω)=xki(ω)
In formula, Hki(ω) is vibration acceleration frequency response transmission function of k-th of equipment mass center to i-th of under-chassis, xki(ω)
The vibration acceleration at lower under-chassis is acted on for k-th of equipment centroid position unit force.
3, according to the frequency band sound source level L of the stand-alone device of ship stand-alone device underwater radiation noise formula Ship 'Pkm
(ω) and sound source level LPk:
In formula, M is the total number of frequency band, P0=1 μ Pa is reference sound pressure, Fkm(ω) is the at k-th equipment centroid position
Exciting force under m frequency band, TkThe transmission function of (ω) between equipment motivation power and equipment single machine radiated noise acoustic pressure, generally
It is measured by the pier mooring test of parent ship:
Tk(ω)=Pk(ω)/fk(ω)
In formula, fk(ω) is exciting force at k-th of the equipment measured on parent ship, Pk(ω) is to measure on parent ship
K-th of equipment generate single machine radiated noise equivalent sound pressure.
4, according at a meters of Ship ' transverse direction of multi-source energy supposition formula by stem to total sound of j-th of sound field point of ship stern
Grade PjWith sound control Pj(ω):
In formula, N is equipment total number, ljIndicate the fore-and-aft distance between j-th of sound field point and stem, lkIndicate k-th of equipment
Fore-and-aft distance between stem, a take 50 meters.
According to PjAcoustic pressure can be drawn along hull longitudinal distribution curve, and be considered as ship by characteristic curve, by curve
Peak value do vertical line to ship longitudinal axis, intersection point is the equivalent acoustic centre of source of ship, away from stem distance be l0。
5, characteristics of ship underwater radiation noise sound source level L is estimated according to sound source level calculation formulaP, frequency band sound source level LP(ω) harmony
Pressure spectrum source level LPs(ω):
LP=max (Pj)
LP(ω)=max (Pj(ω))
LPs(ω)=LP(ω)-10logΔω
In formula, △ ω is the bandwidth that center frequency is ω.
6, characteristics of ship underwater radiation noise sound source level, frequency band sound source level and the spectra of sound pressure source level and design 5 steps being calculated
Demand limit compares, and when above three value is all larger than equal to demand limit, characteristics of ship underwater radiation noise qualified is removed
It is unqualified except this.
The present invention can estimate the far field sound pressure value of ship under running working condition according to demonstration stage ship conceptual scheme, from
And propose the indexs such as the underwater radiation noise sound source level, frequency band sound source level and spectra of sound pressure source level of novel ship, and limit according to demand
Value carries out demonstration assessment to it.
Claims (5)
1. a kind of characteristics of ship underwater radiation noise appraisal procedure, it is characterized in that:
Step 1, the boat length l, lectotype selection and the equipment total number N that input ship conceptual scheme, equipment are away from stem distance li；
Step 2, the exciting force for going out equipment centroid position using equipment motivation source load identification formulas solutions；
Step 3 utilizes the stand-alone device far field underwater radiation noise of ship stand-alone device underwater radiation noise formula Ship '
Sound source level LPkWith frequency band sound source level LPkm(ω)；
Step 4, using by stem to the overall level of stern each point, being drawn at a meters of Ship ' transverse direction of multi-source energy supposition formula
Acoustic pressure along hull longitudinal distribution curve as ship by characteristic curve, determine the equivalent acoustic centre of source of ship；
Step 5 utilizes sound source level calculation formula estimation characteristics of ship underwater radiation noise sound source level, frequency band sound source level and spectra of sound pressure source
Grade；
Step 6 needs the obtained characteristics of ship underwater radiation noise sound source level of step 5, frequency band sound source level, spectra of sound pressure source level and design
It asks limit value to compare, obtains characteristics of ship underwater radiation noise parameter demonstration assessment result.
2. characteristics of ship underwater radiation noise appraisal procedure according to claim 1, it is characterized in that frequency band sound described in step 3
Source level LPkm(ω) and sound source level LPkIt indicates are as follows:
Wherein, M is the total number of frequency band, P0For reference sound pressure, Fkm(ω) is under m-th of frequency band at k-th of equipment centroid position
Exciting force, TkThe transmission function of (ω) between equipment motivation power and equipment single machine radiated noise acoustic pressure, passes through parent ship
Pier mooring test measures:
Tk(ω)=Pk(ω)/fk(ω)
In formula, fk(ω) is exciting force at k-th of the equipment measured on parent ship, Pk(ω) is the kth measured on parent ship
The single machine radiated noise equivalent sound pressure that a equipment generates.
3. characteristics of ship underwater radiation noise appraisal procedure according to claim 2, it is characterized in that public using multi-source energy supposition
By stem to the overall level P of j-th of sound field point of ship stern at a meters of formula Ship ' transverse directionjWith sound control Pj(ω) is indicated are as follows:
Wherein, N is equipment total number, ljIndicate the fore-and-aft distance between j-th of sound field point and stem, lkIndicate k-th of equipment and ship
Fore-and-aft distance between bow.
4. characteristics of ship underwater radiation noise appraisal procedure according to claim 3, it is characterized in that utilizing sound source level calculation formula
The characteristics of ship underwater radiation noise sound source level L of estimationP、LP(ω) and spectra of sound pressure source level LPs(ω) is respectively indicated are as follows:
LP=max (Pj)
LP(ω)=max (Pj(ω))
LPs(ω)=LP(ω)-10logΔω
Wherein, △ ω is the bandwidth that center frequency is ω.
5. characteristics of ship underwater radiation noise appraisal procedure according to claim 4, it is characterized in that: P0=1 μ Pa.
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Cited By (3)
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| CN114117641A (en) * | 2021-12-01 | 2022-03-01 | 中国船舶科学研究中心 | Method for evaluating underwater radiation noise caused by equipment under real ship installation condition |
| CN115630446A (en) * | 2022-12-23 | 2023-01-20 | 中国人民解放军海军工程大学 | Rapid deduction method for real-time simulation of low-frequency radiation noise of underwater vehicle structure |
| CN115783167A (en) * | 2022-11-04 | 2023-03-14 | 哈尔滨工程大学 | Ship design stage sonar self-noise evaluation method and system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114117641A (en) * | 2021-12-01 | 2022-03-01 | 中国船舶科学研究中心 | Method for evaluating underwater radiation noise caused by equipment under real ship installation condition |
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| CN115630446A (en) * | 2022-12-23 | 2023-01-20 | 中国人民解放军海军工程大学 | Rapid deduction method for real-time simulation of low-frequency radiation noise of underwater vehicle structure |
| CN115630446B (en) * | 2022-12-23 | 2023-04-07 | 中国人民解放军海军工程大学 | Rapid deduction method for real-time simulation of low-frequency radiation noise of underwater vehicle structure |
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Inventor after: Pang Fuzhen Inventor after: Li Haichao Inventor after: Wang Xueren Inventor after: Miao Xuhong Inventor after: Wei Zheng Inventor after: Li Yuhui Inventor after: Huo Ruidong Inventor after: Peng Dewei Inventor before: Pang Fuzhen Inventor before: Huo Ruidong Inventor before: Wang Xueren Inventor before: Miao Xuhong Inventor before: Wei Zheng Inventor before: Li Haichao Inventor before: Li Yuhui Inventor before: Peng Dewei |
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