CN110031158A - A kind of EMU air-tightness quantitative detecting method and system - Google Patents
A kind of EMU air-tightness quantitative detecting method and system Download PDFInfo
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- CN110031158A CN110031158A CN201910390182.0A CN201910390182A CN110031158A CN 110031158 A CN110031158 A CN 110031158A CN 201910390182 A CN201910390182 A CN 201910390182A CN 110031158 A CN110031158 A CN 110031158A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
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- Examining Or Testing Airtightness (AREA)
Abstract
The invention discloses a kind of EMU air-tightness quantitative detecting method and systems, it include: that acquisition Motor train unit body building enclosure two sides are under different pressure differences respectively, EMU inner air and outer air temperature, EMU external and internal pressure and pressurization/pressure regulating equipment data on flows when reaching steady working condition；Pass through the volume of air flow of Motor train unit body building enclosure according to pressurization/pressure regulating equipment data on flows amendment；Determine the volume of air flow of Motor train unit body building enclosure and the relational expression of building enclosure two sides pressure difference；Logarithm conversion is carried out respectively to above-mentioned relation formula both sides；According to the collected data, the relational expression after Logarithm conversion is subjected to the reverse linear fit of least square method, obtains air the index number of the flow and air mass flow coefficient；Tested the quantity of air infiltration of the EMU in the case where setting operating condition is calculated, as its air-tightness quantitative assessing index.The beneficial effects of the present invention are: detection system low cost, the air-tightness of energy quantitative reaction car body.
Description
Technical field
The invention belongs to EMU air-leakage test technical field more particularly to a kind of EMU air-tightness quantitative detection sides
Method and system.
Background technique
Only there is provided background technical informations related to the present invention for the statement of this part, it is not necessary to so constitute first skill
Art.
EMU is important one of modern means of communication.EMU air-tightness refers to that air passes through in car body building enclosure
Resistance when air penetration path, air-leakage test are important procedures when EMU is newly made and overhauled.Good air-tightness pair
It is safely operated and the comfort level of indoor occupant is most important.Existing detection method uses the unsteady pressure method of descending, corresponding
Detection system cost is high, and detection pressure is high, and test result is unable to the air-tightness and infiltration physical process of quantitative reaction car body.
Summary of the invention
To solve the above-mentioned problems, the present invention proposes a kind of EMU air-tightness quantitative detecting method and system, with motor-car
Based on the air flow resistance characteristic of group in the steady state, by measuring its quantity of air infiltration under different pressure differences, quantitatively determine dynamic
The air-tightness of vehicle group.
In some embodiments, it adopts the following technical scheme that
A kind of EMU air-tightness quantitative detecting method, comprising:
Acquisition Motor train unit body building enclosure two sides are under different pressure differences respectively, outer space in EMU when reaching steady working condition
Temperature degree, EMU external and internal pressure and pressurization/pressure regulating equipment data on flows；
Pass through the volume of air flow of Motor train unit body building enclosure according to pressurization/pressure regulating equipment data on flows amendment；
According to air the index number of the flow and air mass flow coefficient, the volume of air stream of Motor train unit body building enclosure is determined
The relational expression of amount and building enclosure two sides pressure difference；
Logarithm conversion is carried out respectively to above-mentioned relation formula both sides；
According to EMU inner air and outer air temperature, EMU external and internal pressure and pressurization/pressure regulating equipment data on flows of acquisition,
Relational expression after Logarithm conversion is subjected to the reverse linear fit of least square method, obtains air the index number of the flow and air mass flow
Coefficient；
According to obtained air the index number of the flow and air mass flow coefficient, tested EMU is calculated in the case where setting operating condition
The quantity of air infiltration, as its air-tightness quantitative assessing index.
In other embodiments, it adopts the following technical scheme that
A kind of EMU air-tightness quantitative detection system, comprising: pressurization/decompressor, flow measurement device, indoor and outdoor temperature
Spend measuring device, indoor and outdoor device for pressure measurement and data processing centre；
Pressurization/the decompressor is pressurization/reduced pressure treatment in EMU, the flow measurement device by frequency conversion fan
Frequency conversion fan flow is measured, the indoor and outdoor temperature measuring device measures EMU indoor and outdoor temperature, the interior external pressure respectively
Force measuring device measures EMU indoor and outdoor pressure respectively；The data processing centre acquires measurement data, and according to measurement number
According to the quantity of air infiltration of the EMU in the case where setting operating condition is calculated, as its air-tightness quantitative assessing index.
Compared with prior art, the beneficial effects of the present invention are:
(1) detection system low cost, the air-tightness of energy quantitative reaction car body.
(2) test result can qualitative, quantitative reaction EMU building enclosure air penetration physical phenomenon.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.
Fig. 1 is EMU air-tightness quantitative detection system structural schematic diagram in embodiment one；
Fig. 2 is Extensible framework combining structure schematic diagram in embodiment one；
Wherein, 1. frequency conversion fan, 2. filters, 3. air supply ducts, 4. Extensible frameworks, 5. packing cloths, 6. connecting holes, 7.
Data sink, 8. data processing centres.
Specific embodiment
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms that the present invention uses have logical with the application person of an ordinary skill in the technical field
The identical meanings understood.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
Embodiment one
In one or more embodiments, a kind of EMU air-tightness quantitative detecting method is disclosed, comprising:
Acquisition Motor train unit body building enclosure two sides are under different pressure differences respectively, outer space in EMU when reaching steady working condition
Temperature degree, EMU external and internal pressure and pressurization/pressure regulating equipment data on flows；
Pass through the volume of air flow of Motor train unit body building enclosure according to pressurization/pressure regulating equipment data on flows amendment；
According to air the index number of the flow and air mass flow coefficient, the volume of air stream of Motor train unit body building enclosure is determined
The relational expression of amount and building enclosure two sides pressure difference；Logarithm conversion is carried out respectively to above-mentioned relation formula both sides；
According to EMU inner air and outer air temperature, EMU external and internal pressure and pressurization/pressure regulating equipment data on flows of acquisition,
Relational expression after Logarithm conversion is subjected to the reverse linear fit of least square method, obtains air the index number of the flow and air mass flow
Coefficient；
According to obtained air the index number of the flow and air mass flow coefficient, tested EMU is calculated in the case where setting operating condition
The quantity of air infiltration, as its air-tightness quantitative assessing index.
The present embodiment method is based on EMU air flow resistance characteristic in the steady state, by measuring it in different pressure differences
Under the quantity of air infiltration, quantitatively determine the air-tightness of EMU.Firstly, pressurizeed using pressurization/pressure regulating equipment to EMU,
EMU inner air and outer air temperature, pressure, pressurization/pressure regulating equipment data on flows when record system reaches the first steady working condition；To adopting
The data of collection are weighted processing, obtain the test result of the first steady working condition；Secondly, by changing pressurization/pressure regulating equipment
Parameter change EMU building enclosure two sides pressure difference, EMU internal and external temperature, pressure, pressurization/subtract when record system reaches stable state
Press equipment flow；Finally, carrying out data processing to test result: it is assumed that flow meets power exponential function relationship with pressure difference；It will stream
Amount is converted under standard condition；Logarithm process is carried out to flow and pressure difference, and reverse according to test result progress least square method
Linear fit obtains the coefficient and index of power exponential function.
The process of data processing is carried out to test result specifically:
Since indoor and outdoor air state is different, such as temperature/density, therefore pass through the volume of air flow of test macro blower
(qm) not equal to the volume of air flow (q by car body D building enclosureenv)。
It is as follows that relationship is corrected under applied voltage test mode:
Wherein, ρinWith TinThe respectively corresponding density (kg/m of room air3) and temperature (K)；ρeWith TeIt is respectively outdoor
Corresponding density (the kg/m of air3) and temperature (K).
It can be in the hope of the air mass flow of car body D building enclosure two sides by above-mentioned amendment relational expression.According to revised survey
Data are measured, least square method can be used and further acquire air permeation characteristics parameter, i.e. air the index number of the flow n and air stream
Coefficient of discharge Cenv(m3/(h·Pan)。
It is as follows by the quantity of air infiltration and building enclosure two sides pressure difference relational expression of car body D building enclosure:
qenv=Cenv(Δpenv)n (2)
For the ease of statement, above formula is abbreviated as
Q=C (Δ p)n (3)
Least square method calculating process is as follows:
Using q and Δ p as variable, Logarithm conversion is carried out to above formula both sides, is obtained:
Ln (q)=nln (Δ p)+ln (C) (4)
It is another:
Y=ln (q) (5)
X=ln (Δ p) (6)
C.10, formula is converted to following linear forms:
Y=nx+ln (C) (7)
For completely building air tightness test, test result includes a series of test points, i.e. building enclosure two sides not
It is another for each test point with the quantity of air infiltration corresponding under pressure difference:
yi=ln (qi) (8)
xi=ln (Δ pi) i=1,2....N (9)
Wherein, N is measuring point quantity.It is another:
According to above-mentioned variable, the best estimate value calculating method of n, C are as follows:
Using inversely deducing obtained power exponential function coefficient and index (i.e. air mass flow coefficient CenvRefer to flow characteristics
Number n), calculates tested the quantity of air infiltration of the EMU under specific operation as its air-tightness quantitative assessing index.
Obtained air the index number of the flow and air mass flow coefficient are brought into the air of Motor train unit body building enclosure
The relational expression of volume flow and building enclosure two sides pressure difference in the situation known to the pressure difference of building enclosure two sides, can be moved
The volume of air flow of vehicle group car body building enclosure, i.e., tested the quantity of air infiltration of the EMU in the case where setting operating condition.
For example, tested EMU building enclosure two sides pressure difference is 100Pa, then qenv=Cenv|100|n。
Embodiment two
In one or more embodiments, a kind of EMU air-tightness quantitative detection system is disclosed, by this implementation
Example system can be realized EMU air-tightness quantitative detecting method described in embodiment one；Shown in referring to Fig.1, EMU is airtight
Property quantitative detection system include: that pressurization/decompressor, flow measurement device, indoor and outdoor temperature measuring device, indoor external pressure are surveyed
Measure device and data processing centre；Pressurization/decompressor is pressurization/reduced pressure treatment in EMU by frequency conversion fan, and flow is surveyed
It measures device and measures frequency conversion fan flow, indoor and outdoor temperature measuring device measures EMU indoor and outdoor temperature, indoor external pressure respectively
Measuring device measures EMU indoor and outdoor pressure respectively；Data processing centre acquires measurement data, and is calculated according to measurement data
The quantity of air infiltration of the EMU in the case where setting operating condition, as its air-tightness quantitative assessing index.
Wherein, pressurization/decompressor includes frequency conversion fan 1, Extensible framework 4 and packing cloth 5, referring to Fig. 2, packing cloth 5
It is fixed in Extensible framework 4, packing cloth 5 is equipped with connecting hole 6, and frequency conversion fan 1 is connect by air supply duct 3 with connecting hole 6；
Frequency conversion fan 1 is arranged outside EMU, and filter 2 is arranged between frequency conversion fan 1 and air supply duct 3；Extensible framework 4 will be close
Envelope cloth 5 is fixed on door/window of EMU；It is realized by controlling rotating forward or the reversion of frequency conversion fan to adding in EMU
Pressure or decompression.
In the present embodiment, frequency conversion fan 1 has frequency conversion function, for adjusting compressor flow, and blower lift should be able to gram
Take air flow resistance；Extensible framework 4 has certain retractility and intensity, for packing cloth 5 to be fixed on outside EMU
In door and window；Packing cloth 5 has good gas barrier properties and flexibility, makes it that can continuously be distributed in Extensible framework 4 and EMU
Contact portion, and two sides pressure difference in a certain range when, Air permenbility is approximately zero；Connecting hole 6 has elastic sealing ring, makes to blow
It is in close contact on the inside of pipeline 3 and sealing ring；Filter 2 has certain filtration, and the impurity in air is prevented to enter system；
Air supply duct 3 has retractable, to facilitate the installation and arrangement of system.
Flow measurement device is flowmeter, is located on air supply duct, for monitoring air output；
Indoor and outdoor temperature measuring device includes outside air temperature meter and indoor air temperature meter, is respectively used to measurement motor-car
Group indoor and outdoor temperature；And further calculate indoor and outdoor air density.
Indoor and outdoor device for pressure measurement includes ambient atmospheric pressure meter and room air pressure gauge, and it is indoor to be respectively used to monitoring
Outer air pressure, and further calculate indoor and outdoor air pressure difference.
Each measuring device measurement accuracy all with higher, to guarantee final testing result error within controlled range；
Each measuring device all has the function of data remote, in order to which the real-time Transmission of data is handled.
In the specific structure of EMU air-tightness quantitative detection system shown in Fig. 1, include: flowmeter A, outdoor sky
Gas thermometer B1, ambient atmospheric pressure table C1, indoor air temperature meter B2, room air pressure gauge C2 and Motor train unit body D.
The specific work process of the present embodiment system is as follows:
1) after Motor train unit body D construction, vehicle is blocked according to test request；
2) system pressurization/decompressor is installed in the external door of tested vechicle；
3) in tested EMU building enclosure two sides install room pressure table C2, indoor temperature meter B2, pressure outside table C1,
Outdoor thermometer B1 installs flowmeter A on air supply duct；
4) each measuring device is connected to data sink 7, data sink 7 is connected to data processing centre 8, is gone forward side by side
Row test；
5) after system communication connection is normal, frequency conversion fan 1 is opened, compressor flow is adjusted by frequency converter, makes EMU car
The two sides body D pressure difference reaches setting value P1；
6) enter the first steady working condition to system, using data processing centre 8 to measured flux Q, indoor and outdoor air pressure
P, temperature T is sampled (such as 100 times), and carries out arithmetic weight, as the first steady working condition test result；
7) air quantity that blower 1 is adjusted by frequency converter, makes the two sides Motor train unit body D pressure difference reach setting value P2；
8) enter the second steady working condition to system, using data processing centre 8 to measured flux Q, indoor and outdoor air pressure
P, temperature T is sampled (such as 100 times), and carries out arithmetic weight, as the second steady working condition test result；
9) it is sequentially adjusted in the air quantity of frequency converter adjustment blower, changes the two sides Motor train unit body D pressure difference and reaches setting value Pi, and
Record corresponding flow Q, pressure P, temperature T test result.
10) data processing is carried out to test result.First, it is assumed that flow meets power exponential function relationship with pressure difference；Secondly,
It will be under flow rate conversion to standard condition；Finally, carrying out logarithm process to flow and pressure difference, and minimum two is carried out according to test result
The reverse linear fit of multiplication, the quantity of air infiltration and the power in the pressure difference relational expression of building enclosure two sides for obtaining car body D building enclosure
Exponential function coefficient and index.Detailed process is referring to method described in embodiment one.
11) using obtained power exponential function coefficient and index is inversely deduced, tested EMU is calculated under specific operation
The quantity of air infiltration (such as 100Pa), as its air-tightness quantitative assessing index.
It should be noted that unit under test need to be carried out using seal frame combination when being detected to Motor train unit body D component
Sealing, if unit under test size is smaller, can be used foamed glue and directly packing cloth is pasted on unit under test, and there are certain
Space install air supply duct.
It should be noted that other steps are the same as vehicle test pattern in addition to tested EMU prepares operating condition difference.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (7)
1. a kind of EMU air-tightness quantitative detecting method characterized by comprising
Acquisition Motor train unit body building enclosure two sides are under different pressure differences respectively, EMU inner air and outer air temperature when reaching steady working condition
Degree, EMU external and internal pressure and pressurization/pressure regulating equipment data on flows；
Pass through the volume of air flow of Motor train unit body building enclosure according to pressurization/pressure regulating equipment data on flows amendment；
According to air the index number of the flow and air mass flow coefficient, determine the volume of air flow of Motor train unit body building enclosure with
The relational expression of building enclosure two sides pressure difference；
Logarithm conversion is carried out respectively to above-mentioned relation formula both sides；
It, will be right according to EMU inner air and outer air temperature, EMU external and internal pressure and pressurization/pressure regulating equipment data on flows of acquisition
Relational expression after number conversion carries out the reverse linear fit of least square method, obtains air the index number of the flow and air mass flow system
Number；
According to obtained air the index number of the flow and air mass flow coefficient, tested air of the EMU in the case where setting operating condition is calculated
Infiltration capacity, as its air-tightness quantitative assessing index.
2. a kind of EMU air-tightness quantitative detecting method as described in claim 1, which is characterized in that according to pressurization/decompression
The amendment of equipment data on flows passes through the volume of air flow of Motor train unit body building enclosure, specifically:
Wherein, qenvFor the volume of air flow of Motor train unit body building enclosure, qmFor pressurization/pressure regulating equipment data on flows, ρinWith
TinThe respectively corresponding density of room air and temperature, ρeWith TeThe respectively corresponding density of outdoor air and temperature.
3. a kind of EMU air-tightness quantitative detecting method as described in claim 1, which is characterized in that the Motor train unit body
The volume of air flow of building enclosure and the relational expression of building enclosure two sides pressure difference, specifically:
qenv=Cenv(Δpenv)n
Wherein, qenvFor the volume of air flow of Motor train unit body building enclosure, n is air the index number of the flow, CenvFor air
Discharge coefficient, Δ penvFor building enclosure two sides pressure difference.
4. a kind of EMU air-tightness quantitative detecting method as described in claim 1, which is characterized in that after Logarithm conversion
Relational expression carries out the reverse linear fit of least square method, specifically:
Relational expression after Logarithm conversion are as follows: ln (qenv)=nln (Δ penv)+ln(Cenv)；
Another y=ln (qenv), x=ln (Δ penv), it obtains: y=nx+ln (Cenv)；
The test data for bringing each test point into obtains air the index number of the flow n and air mass flow coefficient CenvFitting knot
Fruit.
5. a kind of EMU air-tightness quantitative detecting method as described in claim 1, which is characterized in that according to obtained air
The index number of the flow and air mass flow coefficient calculate tested the quantity of air infiltration of the EMU in the case where setting operating condition, specifically:
Obtained air the index number of the flow and air mass flow coefficient are brought into the volume of air of Motor train unit body building enclosure
The relational expression of flow and building enclosure two sides pressure difference in the situation known to the pressure difference of building enclosure two sides, can obtain EMU
The volume of air flow of car body building enclosure, i.e., tested the quantity of air infiltration of the EMU in the case where setting operating condition.
6. a kind of EMU air-tightness quantitative detection system characterized by comprising pressurization/decompressor, flow measurement dress
It sets, indoor and outdoor temperature measuring device, indoor and outdoor device for pressure measurement and data processing centre；
Pressurization/the decompressor is pressurization/reduced pressure treatment in EMU by frequency conversion fan, the flow measurement device measurement
Frequency conversion fan flow, the indoor and outdoor temperature measuring device measure EMU indoor and outdoor temperature respectively, and the interior external pressure is surveyed
Amount device measures EMU indoor and outdoor pressure respectively；The data processing centre acquires measurement data, and according to measurement data meter
The quantity of air infiltration of the EMU in the case where setting operating condition is calculated, as its air-tightness quantitative assessing index.
7. a kind of EMU air-tightness quantitative detection system as claimed in claim 6, which is characterized in that the pressurization/decompression
Device includes frequency conversion fan, Extensible framework and packing cloth, and the packing cloth is fixed in Extensible framework, and packing cloth is equipped with
Connecting hole, frequency conversion fan are connect by pipeline with connecting hole；Packing cloth is fixed on door/window of EMU by the Extensible framework
On.
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