CN106872574A - A kind of coupling loss factor experimental technique of bullet train aluminium section bar and the operatic tunes - Google Patents
A kind of coupling loss factor experimental technique of bullet train aluminium section bar and the operatic tunes Download PDFInfo
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- CN106872574A CN106872574A CN201710252361.9A CN201710252361A CN106872574A CN 106872574 A CN106872574 A CN 106872574A CN 201710252361 A CN201710252361 A CN 201710252361A CN 106872574 A CN106872574 A CN 106872574A
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- section bar
- aluminium section
- operatic tunes
- receiving chamber
- loss factor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H7/00—Measuring reverberation time ; room acoustic measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0234—Metals, e.g. steel
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- General Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
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- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The present invention relates to a kind of bullet train aluminium section bar and the coupling loss factor experimental technique of the operatic tunes, comprise the following steps：Sound insulation measurement to car body aluminium section bar in sound booth obtains the acoustic pressure of the operatic tunes in sounding room and receiving chamber respectively；Vibration acceleration test on aluminium section bar during sound insulation measurement；Reverberation time to the operatic tunes in sounding room and receiving chamber tests；Aluminium section bar modal density is obtained using half-power bandwidth method；Calculating analysis is carried out to the coupling loss factor of car body aluminium section bar and the operatic tunes based on statistic energy analysis method.The beneficial effects of the invention are as follows：Can the accurate coupling loss factor for calculating high-speed train body aluminium section bar and the operatic tunes, researcher can be helped accurately to set up the equivalent forecast model of bullet train statistical Energy Analysis Approach.
Description
Technical field
NVH the invention belongs to rail traffic vehicles industry predicts field, is related to a kind of bullet train aluminium section bar and the operatic tunes
Coupling loss factor experimental technique.
Background technology
According to domestic and international bullet train aluminium section bar and the coupling loss factor analysis method of the operatic tunes, one kind is to utilize finite element
Method is tested to the radiation efficiency of aluminium section bar so as to calculate acquisition coupling loss factor, the coupling loss needs that this mode is obtained
By prolonged calculating, and can only the accurate coupling loss factor for predicting low frequency；Another kind is the side using experiment
Formula is obtained, and the vibrator that experiment is used belongs to power excitation and actual bullet train has certain error with noise excitation.
Experiment acquisition is carried out to the coupling loss factor of bullet train aluminium section bar and the operatic tunes based on statistic energy analysis method, from
And for the High-Speed Train Design stage statistic energy analysis equivalent forecast model of method provides theoretical direction.
The content of the invention
The technical problem to be solved in the present invention is：Based on above mentioned problem, the present invention provide a kind of bullet train aluminium section bar with
The coupling loss factor experimental technique of the operatic tunes.
The present invention solves a technical scheme being used of its technical problem：A kind of bullet train aluminium section bar and the operatic tunes
Coupling loss factor experimental technique, comprises the following steps：Sound insulation measurement to car body aluminium section bar in sound booth is sent out respectively
The acoustic pressure of the operatic tunes in sound chamber and receiving chamber；Vibration acceleration test on aluminium section bar during sound insulation measurement；To sounding room and reception
The reverberation time of the indoor operatic tunes is tested；Aluminium section bar modal density is obtained using half-power bandwidth method；Based on statistics energy point
Analysis method carries out calculating analysis to the coupling loss factor of car body aluminium section bar and the operatic tunes.
Specifically include following steps：
(1) high-speed train body aluminium section bar exemplar is selected；
(2) high-speed train body aluminium section bar exemplar is installed to the experiment hole of sound insulation measurement；
(3) place that encapsulation process ensures noiseless leakage is carried out to exemplar surrounding using putty, while using fixture to aluminium
Section bar is fixed；
(4) it is transaudient in sounding room and receiving chamber arrangement 12 respectively according to sound insulation measurement standard GB/T19889.3-2005
Device, and place 12 face non-directive sound sources in corner；
(5) 10 acceleration sensings are arranged at random respectively in the sounding room side of car body aluminium section bar exemplar and receiving chamber side
Device；
(6) sound source is placed in sounding room the test for carrying out sounding room and receiving chamber acoustic pressure, while test obtaining aluminium section bar sample
Acceleration responsive on part；
(7) sound source is respectively placed in sounding room and receiving chamber and carries out reverberation time test；
(8) aluminium section bar modal density is obtained using half-power bandwidth method；
(9) calculate sounding room energy, receive room energy frequency spectrum figure, aluminium section bar energy, fissipation factor, receiving chamber in sounding room
Internal loss factor, sounding room input power frequency spectrum, sounding room and receiving chamber modal density, the coupling loss of sounding room to receiving chamber
The factor, receiving chamber calculate the coupling of car body aluminium section bar and the operatic tunes based on statistic energy analysis method to the coupling loss factor of sounding room
Close fissipation factor.
The beneficial effects of the invention are as follows：High-speed train body aluminium section bar can be accurately calculated to be damaged with the coupling of the operatic tunes
The consumption factor, can help researcher accurately to set up the equivalent forecast model of bullet train statistical Energy Analysis Approach.
Brief description of the drawings
The present invention is further described below in conjunction with the accompanying drawings.
Fig. 1 is sounding room energy frequency spectrum figure；
Fig. 2 is receiving chamber energy frequency spectrum figure；
Fig. 3 is aluminium section bar energy frequency spectrum figure；
Fig. 4 is fissipation factor spectrogram in sounding room；
Fig. 5 is receiving chamber internal loss factor spectrogram；
Fig. 6 is sounding room input power spectrogram；
Fig. 7 is sounding room modal density spectrogram；
Fig. 8 is receiving chamber modal density spectrogram；
Fig. 9 is coupling loss factor spectrogram of the sounding room to receiving chamber；
Figure 10 is coupling loss factor spectrogram of the receiving chamber to sounding room；
Figure 11 is the coupling loss factor spectrogram between aluminium section bar and the operatic tunes；
Figure 12 is bullet train aluminium section bar energy transmission schematic diagram；
Wherein：1. sounding room, 2. aluminium section bar, 3. receiving chamber.
Specific embodiment
Presently in connection with specific embodiment, the invention will be further described, and following examples are intended to illustrate rather than
Limitation of the invention further.
(1) spectrum measurement of oise insulation factor is carried out to body construction according to GB/T19889-2005 in acoustical laboratory, it is first
First the average sound pressure to sounding room and receiving chamber is tested, and then calculates sounding room and receiving chamber energy respectively according to formula (1)
Amount
In formula：V represents sounding room or receives building volume；P represents acoustic pressure in sounding room and receiving chamber；ρ represents atmospheric density；
C represents transmission speed of the sound in the operatic tunes.Sounding room and receiving chamber energy frequency spectrum figure are shown in Fig. 1,2.
(2) acceleration responsive on aluminium section bar is tested respectively while sound insulation measurement, is calculated according to formula (3)
Obtain energy of the aluminium section bar in the case of acoustically-driven
E=M ν2 (2)
In formula：M represents the quality of aluminium section bar exemplar；ν represents that aluminium shape surface average speed is responded.Aluminium section bar energy frequency spectrum
See Fig. 3.
(3) after sound insulation measurement has been carried out, according to GB/T 20247-2006 to the reverberation time in sounding room and receiving chamber
Test, so that the internal loss factor obtained in sounding room and receiving chamber is calculated by formula (3),
In formula：T60Represent the reverberation time；F represents analysis frequency.Internal loss factor spectrogram in sounding room and receiving chamber
See Fig. 4,5.
(4) after sound insulation measurement and reverberation time test, the input power obtained in sounding room is calculated by formula (4),
P1=Lw-10log(4/A) (4)
In formula：A represents the absorption of the sounding room operatic tunes, LwRepresent the sound pressure level in the operatic tunes.Sounding room input power frequency spectrum
See Fig. 6.
(5) calculate obtain the operatic tunes in the energy and receiving chamber of the operatic tunes in sounding room and receiving chamber internal loss factor it
Afterwards, can be calculated by formula (5) and obtain sounding room to receiving chamber coupling loss factor,
In formula：η13Represent sounding room to receiving chamber coupling loss factor；η3Represent receiving chamber operatic tunes internal loss factor；E1With
E3The energy of the operatic tunes in sounding room and receiving chamber is represented respectively.Fig. 9 is seen in sounding room to the coupling loss factor spectrogram of receiving chamber.
(6) modal density of sounding room and the receiving chamber operatic tunes is calculated by formula (6) and obtained,
In formula：V0It is the volume of the operatic tunes；CaIt is the velocity of sound in air；AsIt is the surface area of the operatic tunes；leIt is the girth of the operatic tunes.
Sounding room and receiving chamber modal density spectrogram are shown in Fig. 7,8.
(7) the acceleration frequency response function result based on aluminium section bar in half-power bandwidth method, using mode counting method, by system
The quantity for counting formant obtains the modal density of aluminium section bar.
(8) in the modal density by calculating the sounding room and receiving chamber operatic tunes for obtaining, according to statistic energy analysis method
Reciprocity formula (7) is calculated and obtains receiving chamber to the coupling loss factor between sounding room.
Receiving chamber is shown in Figure 10 to the coupling loss factor spectrogram of sounding room.
(9) in input power, the internal loss factor of the sounding room operatic tunes, sounding room and the receiving chamber for obtaining the sounding room operatic tunes
The operatic tunes energy, the coupling loss factor of receiving chamber to sounding room in the case of, by formula (8) and statistical Energy Analysis Approach reciprocity
Property principle n1η12=n2η21, calculate the coupling loss factor for obtaining aluminium section bar and the operatic tunes.
Figure 12 is the coupling loss factor experiment schematic diagram of bullet train aluminium section bar and the operatic tunes.
By the power flow equilibrium relation of statistic energy analysis method, can obtain：
In formula：P represents input power, wherein P2And P3Equal to zero；ω is angular frequency；ηiRepresent subsystem internal loss because
Son；EiRepresent the energy in subsystem；ηijRepresent the coupling loss factor between subsystem.
P is obtained by testing1Sounding room sound source input power, η1Sounding room operatic tunes internal loss factor, E1、E2、E3Sounding room,
Energy, η in aluminium section bar, receiving chamber13Coupling loss factor, η of the sounding room to receiving chamber31Coupling of the receiving chamber to sounding room
Fissipation factor, then by statistical Energy Analysis Approach reciprocity principle n1η12=n2η21, the modal density n of test acquisition aluminium section bar2, while
According to η21=η23, calculate obtain aluminium section bar to the operatic tunes coupling loss factor and the operatic tunes to aluminium section bar coupling loss factor.
Coupling loss factor spectrogram between aluminium section bar and the operatic tunes is shown in Figure 11.
With above-mentioned according to desirable embodiment of the invention as enlightenment, by above-mentioned description, relevant staff is complete
Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' entirely.The technology of this invention
Property scope is not limited to the content on specification, it is necessary to its technical scope is determined according to right.
Claims (2)
1. the coupling loss factor experimental technique of a kind of bullet train aluminium section bar and the operatic tunes, it is characterized in that：Comprise the following steps：
Sound insulation measurement in sound booth to car body aluminium section bar obtains the acoustic pressure of the operatic tunes in sounding room and receiving chamber respectively；Sound insulation measurement process
Vibration acceleration test on middle aluminium section bar；Reverberation time to the operatic tunes in sounding room and receiving chamber tests；Using half-power
Bandwidth Method obtains aluminium section bar modal density；Car body aluminium section bar is entered with the coupling loss factor of the operatic tunes based on statistic energy analysis method
Row calculates analysis.
2. the coupling loss factor experimental technique of a kind of bullet train aluminium section bar according to claim 1 and the operatic tunes, it is special
Levying is：Specifically include following steps：
(1) high-speed train body aluminium section bar exemplar is selected；
(2) high-speed train body aluminium section bar exemplar is installed to the experiment hole of sound insulation measurement；
(3) place that encapsulation process ensures noiseless leakage is carried out to exemplar surrounding using putty, while using fixture to aluminium section bar
It is fixed；
(4) 12 microphones are arranged in sounding room and receiving chamber respectively according to sound insulation measurement standard GB/T19889.3-2005, with
And place 12 face non-directive sound sources in corner；
(5) 10 acceleration transducers are arranged at random respectively in the sounding room side of car body aluminium section bar exemplar and receiving chamber side；
(6) sound source is placed in sounding room the test for carrying out sounding room and receiving chamber acoustic pressure, while test obtaining on aluminium section bar exemplar
Acceleration responsive；
(7) sound source is respectively placed in sounding room and receiving chamber and carries out reverberation time test；
(8) aluminium section bar modal density is obtained using half-power bandwidth method；
(9) coupling loss factor of car body aluminium section bar and the operatic tunes is calculated based on statistic energy analysis method.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710252361.9A CN106872574A (en) | 2017-04-18 | 2017-04-18 | A kind of coupling loss factor experimental technique of bullet train aluminium section bar and the operatic tunes |
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| CN201710252361.9A CN106872574A (en) | 2017-04-18 | 2017-04-18 | A kind of coupling loss factor experimental technique of bullet train aluminium section bar and the operatic tunes |
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| CN106872574A true CN106872574A (en) | 2017-06-20 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110245448A (en) * | 2019-06-24 | 2019-09-17 | 西北工业大学 | A kind of Subsystem equivalent statistics energy spectrometer modeling method |
| CN111044615A (en) * | 2019-12-25 | 2020-04-21 | 苏州大学 | Sound insulation performance analysis method, device and system of sound insulation structure and storage medium |
-
2017
- 2017-04-18 CN CN201710252361.9A patent/CN106872574A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 张捷等: "高速列车铝型材声振特性测试及等效建模", 《浙江大学学报（工学版）》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110245448A (en) * | 2019-06-24 | 2019-09-17 | 西北工业大学 | A kind of Subsystem equivalent statistics energy spectrometer modeling method |
| CN111044615A (en) * | 2019-12-25 | 2020-04-21 | 苏州大学 | Sound insulation performance analysis method, device and system of sound insulation structure and storage medium |
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Application publication date: 20170620 |