CN203772506U - Dynamic air tightness detection device in case of automobile road driving - Google Patents
Dynamic air tightness detection device in case of automobile road driving Download PDFInfo
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- CN203772506U CN203772506U CN201420008664.8U CN201420008664U CN203772506U CN 203772506 U CN203772506 U CN 203772506U CN 201420008664 U CN201420008664 U CN 201420008664U CN 203772506 U CN203772506 U CN 203772506U
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Abstract
The utility model provides a dynamic air tightness detection device in the case of automobile road driving. The detection device is wholly arranged on the automobile, and comprises a speed sensor, an air flow sensor, a differential pressure sensor, an atmospheric pressure sensor, a data acquisition unit, a data communication unit, a data processing module, an automobile window plate, an air connection pipe and a piezometer, wherein the automobile window plate and one automobile window frame on the automobile are arranged in a sealing mode; a pressure measuring hole and a ventilation hole are arranged on the automobile window plate; one end of the air connection pipe is inserted in the ventilation hole to be communicated with the air, and the other end is connected with the air flow sensor; the air connection pipe and the ventilation hole are arranged in a sealing mode; one end of the piezometer is inserted in the pressure measuring hole and communicated with the air, and the other end is connected with the differential pressure sensor; and the piezometer and the pressure measuring hole are arranged in a sealing mode. The dynamic air tightness detection device in the case of automobile road driving has the advantages of little equipment, simple structure and low detection cost.
Description
Technical field
The utility model belongs to vehicle air tightness detection technique field, particularly relates to a kind of trap for automobile dynamic air tightness detecting device that travels.
Background technology
The vehicle body experiments of sealing performance means of knowing in traditional body of a motor car Sealing Technology exploitation have dust-proof test and salt fog test, but these two kinds of test modes are respectively to evaluate the sealing property of vehicle body to solid and liquid, and be general qualitative judgement or description, fail the portraying of quantitative.
What the domestic Autonomous Vehicle company application of open report was more in recent years is the static air-tightness detection device of automobile, can detect and calculate the vehicle body equivalence leakage area (also steelyard slepsydra gas equivalent hole area) of automobile in stationary state.For example, the Chinese patent application that the publication number of ChangAn Automobile is CN201138273 discloses a kind of entire carriage air tightness detecting device, and it comprises blower fan, velometer, restriction device, pressure detecting instrument, differential pressure measuring instrument and computing display; Described blower fan is connected with velometer, fan outlet is connected with the air inlet of restriction device by ripple glue pneumatic hose, the air outlet of restriction device connects airtight compartment to be measured, pressure detecting instrument is arranged in the gas circuit of being drawn by the air outlet of restriction device, differential pressure measuring instrument is arranged in the gas circuit of drawing into and out of air port by restriction device, and pressure detecting instrument, differential pressure measuring instrument are connected with computing display by operation circuit respectively.By this pick-up unit, can detect quantitatively the easily leakage situation at generation Leakage Gas position such as automobile engine compartment, car door, vehicle window and rear-box, correctly judge gas leakage source and accurate leakage rate, effectively control product quality.
Abroad, the Chrysler of the U.S. adopts from taking advantage of the air-breathing method of cabin interior, makes to take advantage of cabin interior to form negative pressure, and outside to form a constant dynamic negative-pressure poor with it, then measures and take advantage of cabin interior air leakage rate; Main Auto manufacturer of Japan is as Hino and Mitsubishi adopt the method for supplying gas to car steering chamber interior, makes inner and a constant dynamic positive pressure differential of its outside formation, then measures car chamber interior leakage rate.
In addition, some companies carry out vehicle body dynamic gas tightness test by the driving cycle of wind1 tunnel laboratory simulated automotive now, in order to detect the vehicle body impermeability under different wind speed.
Therefore, existing air-tightness detection device is used for detecting the static impermeability of body of a motor car, have that equipment is more, complex structure and the defect such as floor area is large, and can only measure the vehicle body impermeability under static operating mode, can not fully verify the impermeability under Real-road Driving Cycle.Detect although can carry out similarly dynamically impermeability by wind tunnel test, cost and the experimentation cost of wind1 tunnel laboratory are higher, and are simulated condition, are not the actual automobile running working condition of reflection eventually.
Utility model content
Technical problem to be solved in the utility model is to carry out dynamic impermeability by wind-tunnel and detect cost and the higher defect of experimentation cost for existing, and a kind of trap for automobile dynamic air tightness detecting device that travels is provided.
It is as follows that the utility model solves the problems of the technologies described above adopted technical scheme:
A kind of trap for automobile dynamic air tightness detecting device that travels is provided, comprises:
This pick-up unit integral arrangement is on automobile, comprise vehicle speed sensor, air flow sensor, differential pressure pickup, atmosphere pressure sensor, data acquisition unit, data communication unit, data processing module, glazing panel, air connecting pipe and piezometric tube, one of them window frame sealing on described glazing panel and automobile arranges, on described glazing panel, be provided with pressure tap and air hole, one end of described air connecting pipe is inserted in described air hole and is communicated with atmosphere, the other end is connected with described air flow sensor, between described air connecting pipe and described air hole, sealing arranges, one end of described piezometric tube is inserted in described pressure tap and is communicated with atmosphere, the other end is connected with described differential pressure pickup, between described piezometric tube and described pressure tap, sealing arranges, wherein,
Described vehicle speed sensor, is connected to described data acquisition unit, for obtaining speed of a motor vehicle analog electrical signal;
Described air flow sensor, is connected to described data acquisition unit, for obtaining charge flow rate analog electrical signal;
Described differential pressure pickup, is connected to described data acquisition unit, for obtaining car inner air and outer air pressure reduction analog electrical signal;
Described atmosphere pressure sensor, is connected to described data acquisition unit, for obtaining ambient atmosphere pressure analog electrical signal;
Described temperature sensor, is connected to described data acquisition unit, for obtaining ambient atmosphere temperature simulation electric signal;
Described data acquisition unit, for determining the measured value of described speed of a motor vehicle analog electrical signal, charge flow rate analog electrical signal, car inside and outside differential pressure analog electrical signal, ambient atmosphere pressure analog electrical signal and environment temperature simulation electric signal, and according to vehicle speed data, charge flow rate data, car inner air and outer air pressure difference data, ambient atmosphere pressure data and the ambient temperature data of described measured value output digital electric signal form;
Described data communication unit, be connected between described data acquisition unit and described data processing module, for vehicle speed data, charge flow rate data, car inner air and outer air pressure difference data, ambient atmosphere pressure data and the ambient temperature data of described data acquisition unit output are transferred to described data processing module.
Further, described vehicle speed sensor is arranged on automobile driving axle or output shaft of gear-box.
Further, described data processing module is portable computer.
The trap for automobile that the utility model the provides dynamic air tightness detecting device that travels, integral arrangement is on automobile, pass through vehicle speed sensor, air flow sensor, differential pressure pickup, atmosphere pressure sensor obtains respectively vehicle speed data, charge flow rate data, car inner air and outer air pressure difference data, ambient atmosphere pressure data and ambient temperature data also finally transfer to data processing module, later stage, according to these data, can utilize conventional method (the static impermeability preparation method of existing vehicle body) to obtain the dynamic impermeability of vehicle body of testing automobile, with respect to prior art, because pick-up unit integral arrangement is on automobile, when detection along with the motion of automobile, in the pressure tap of air-flow from glazing panel and air hole, naturally enter, without building expensive wind1 tunnel laboratory, do not need fan blower yet, thereby it is less to have equipment, advantage simple in structure and experimentation cost is low.In addition, automobile, in normal transport condition, thereby can truly reflect the dynamic impermeability of vehicle body under automobile road driving condition when detecting.
Brief description of the drawings
Fig. 1 is the travel system chart of dynamic air tightness detecting device of trap for automobile that the utility model one embodiment provides;
Fig. 2 is the travel schematic diagram of part in dynamic air tightness detecting device car of trap for automobile that the utility model one embodiment provides;
Fig. 3 is the travel schematic diagram of the outer part of dynamic air tightness detecting device car of trap for automobile that the utility model one embodiment provides;
Fig. 4 is the acquisition interface schematic diagram of the data acquisition software in data processing module.
Reference numeral in Figure of description is as follows:
100, data acquisition module; 200, data processing module; 10, described analog electrical signal acquiring unit; 11, vehicle speed sensor; 12, air flow sensor; 13, differential pressure pickup; 14, atmosphere pressure sensor; 15, temperature sensor; 20, data acquisition unit; 30, data communication unit; 1, glazing panel; 2, air connecting pipe; 3, piezometric tube; 4, pressure tap; 5, air hole.
Embodiment
Clearer for technical matters, technical scheme and beneficial effect that the utility model is solved, below in conjunction with drawings and Examples, the utility model is described in further detail.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
As shown in Figures 1 and 2, the trap for automobile that the utility model one embodiment the provides dynamic air tightness detecting device that travels, comprises data acquisition module 100 and data processing module 200:
Described data acquisition module 100, for obtaining vehicle speed data, charge flow rate data, car inner air and outer air pressure difference data, ambient atmosphere pressure data and ambient temperature data; Described data acquisition module 100 comprises analog electrical signal acquiring unit 10, data acquisition unit 20 and data communication unit 30:
Described analog electrical signal acquiring unit 10, for obtaining speed of a motor vehicle analog electrical signal, charge flow rate analog electrical signal, car inside and outside differential pressure analog electrical signal, ambient atmosphere pressure analog electrical signal and environment temperature simulation electric signal;
Described analog electrical signal acquiring unit 10 comprises:
Vehicle speed sensor 11, is connected to described data acquisition unit 20, for obtaining speed of a motor vehicle analog electrical signal; Described vehicle speed sensor 11 is arranged on the driving shaft of automobile or the output shaft of wheel box, by a BNC(Bayonet Nut Connector, bayonet nut connector) line is connected to described data acquisition unit 20.Preferably, the installation during for the ease of test, described vehicle speed sensor 11 adopts laser velocimeter sensor, and is arranged on the driving shaft of automobile.
Air flow sensor 12, is connected to described data acquisition unit 20, for obtaining charge flow rate analog electrical signal.
Differential pressure pickup 13, is connected to described data acquisition unit 20, for obtaining car inner air and outer air pressure reduction analog electrical signal.
Atmosphere pressure sensor 14, is connected to described data acquisition unit 20, for obtaining ambient atmosphere pressure analog electrical signal.Ambient atmosphere pressure refers to herein, the atmospheric pressure of the automobile present position of detection.
Temperature sensor 15, is connected to described data acquisition unit 20, for obtaining ambient atmosphere temperature simulation electric signal.Environment temperature refers to herein, the temperature of the automobile present position of detection.
Described data acquisition unit 20, be connected with described analog electrical signal acquiring unit 11, for determining the measured value of described speed of a motor vehicle analog electrical signal, charge flow rate analog electrical signal, car inside and outside differential pressure analog electrical signal, ambient atmosphere pressure analog electrical signal and environment temperature simulation electric signal, and according to vehicle speed data, charge flow rate data, car inner air and outer air pressure difference data, ambient atmosphere pressure data and the ambient temperature data of described measured value output digital electric signal form; Data acquisition unit is herein analog input module, for example ADAM4017(8 tunnels analogy amount load module), it can gather the analog input such as voltage, electric current signal.
Described data communication unit 30, be connected between described data acquisition unit 20 and described data processing module 200, for described vehicle speed data, charge flow rate data, car inner air and outer air pressure difference data, ambient atmosphere pressure data and ambient temperature data are transferred to described data processing module 200.Described data communication unit 30 need to ensure the normal communication of data processing module 200 and data acquisition unit 20, realizes the communication between data processing module 200 communications protocol interfaces different from data acquisition unit 20.In the present embodiment, described data communication unit 30 is serial converter, is specially R-485/232 converter, to realize analog input module and dataphone.
Described data processing module 200, for calculate the vehicle body equivalence leakage area under current vehicle speed according to described vehicle speed data, charge flow rate data, car inner air and outer air pressure difference data, ambient atmosphere pressure data and ambient temperature data, and characterize the dynamic impermeability of vehicle body with vehicle body equivalence leakage area; Or, for calculating the multiple flow-pressure differential data groups under the different speed of a motor vehicle according to described vehicle speed data, charge flow rate data, car inner air and outer air pressure difference data, ambient atmosphere pressure data and ambient temperature data, obtain polynomial fittings according to described multiple flow-pressure differential data groups, and characterize the dynamic impermeability of vehicle body with the coefficient of described polynomial fitting.
In the present embodiment, described data processing module 200 is portable computer (notebook computer), and portable computer has advantages of that volume is little, is easy to carry about with one, and is specially adapted to the detection of the dynamic steam tightness of vehicle body.
In the present embodiment, in notebook computer, be preinstalled with data acquisition software, on data acquisition software, can show in real time vehicle speed data, charge flow rate data, car inner air and outer air pressure difference data, ambient atmosphere pressure data and ambient temperature data, and show the data such as atmospheric density and equivalent leakage area of utilizing above-mentioned data to calculate in real time.The interface of data acquisition software as shown in Figure 4.
In the present embodiment, the software for curve such as MAT-LAB is housed in notebook computer, by work out corresponding spline interpolation program language in MAT-LAB, calling this spline interpolation program realizes described multiple flow-pressure differential data groups generation SPL and error analysis curve, and calculate the every coefficient of sectional spline function, thereby draw the spline interpolation algebraic expression of flow-pressure differential relation, characterize the dynamic steam tightness of body of a motor car with this.
In addition, as shown in Figure 3, the described trap for automobile dynamic air tightness detecting device that travels also comprises glazing panel 1, air connecting pipe 2 and piezometric tube 3; Wherein,
Described glazing panel 1, for substitute a glass for vehicle window of falling in the time testing, the sealing setting in the time of test and between its residing window frame of described glazing panel 1, for example can be coated in fluid sealant the surrounding of glazing panel 1, make to seal between glazing panel 1 and window frame, to prevent that air from entering from this, on described glazing panel 1, be provided with pressure tap 4 and air hole 5.Plank of described glazing panel 1 can be also sheet metal.
Described air connecting pipe 2, its one end is inserted in described air hole 5 and is communicated with atmosphere, and the other end is connected with described air flow sensor 12, and between described air connecting pipe 2 and described air hole 5, sealing arranges; For example be coated in the surrounding of air hole 5 with fluid sealant, make sealing between air connecting pipe 2 and air hole 5, to prevent that air from entering from this.
Described piezometric tube 3, its one end is inserted in described pressure tap 4 and is communicated with atmosphere, the other end is connected with described differential pressure pickup 13, between described piezometric tube 3 and described pressure tap 4, sealing arranges, for example be coated in the surrounding of pressure tap 4 with fluid sealant, make sealing between piezometric tube 3 and pressure tap 4, to prevent that air from entering from this.In the present embodiment, piezometric tube is flexible pipe.
The trap for automobile that above-mentioned enforcement the provides concrete testing process of dynamic air tightness detecting device of travelling is as follows:
First, after data acquisition unit, portable computer are connected by serial converter, entirety is placed on the back row seats of automobile, next vehicle rear window glass falls, to be fixed on glass for vehicle window position with the glazing panel of air connecting pipe, and plank surrounding is done to encapsulation process, air connecting pipe other end is connected to air flow sensor in car.Access in car the more external differential pressure pickup of pressure measurement flexible pipe through the reserved pressure tap of glazing panel with a piezometric tube.Fix a laser velocimeter on driving shaft side, be then connected on data acquisition unit by BNC line; Differential pressure pickup, air flow sensor, atmosphere pressure sensor and temperature sensor are arranged in to correct position in car, and differential pressure pickup, air flow sensor, atmosphere pressure sensor and temperature sensor are connected with data acquisition unit by signal wire respectively.
Then, automobile being reached to outdoor (for example skid pad) tests.
The trap for automobile that the utility model the provides dynamic air tightness detecting device that travels, obtain vehicle speed data, charge flow rate data, car inner air and outer air pressure difference data, ambient atmosphere pressure data and ambient temperature data by data acquisition module, after processing above-mentioned data by data processing module, can characterize the dynamic impermeability of vehicle body, with respect to prior art, can truly reflect the dynamic impermeability of vehicle body under automobile road driving condition, and there is the advantage that equipment is less, simple in structure and experimentation cost is low.And in test process, all parts of pick-up unit are all put onboard, test fairly simplely, do not need too many manpower yet, test can be completed by two people, and wherein a people drives, one man operation equipment; Also can be completed by a people (driver), when operating equipment, stop.
The trap for automobile that the utility model above-described embodiment the provides dynamic air tightness detecting device that travels is realized by following detection method, and the method comprises the following steps:
S1, obtain vehicle speed data, charge flow rate data, car inner air and outer air pressure difference data, ambient atmosphere pressure data and ambient temperature data;
S2, calculate vehicle body under current vehicle speed equivalence leakage area according to described vehicle speed data, charge flow rate data, car inner air and outer air pressure difference data, ambient atmosphere pressure data and ambient temperature data, and characterize the dynamic impermeability of vehicle body with vehicle body equivalence leakage area; Or, calculate the multiple flow-pressure differential data groups under the different speed of a motor vehicle according to described vehicle speed data, charge flow rate data, car inner air and outer air pressure difference data, ambient atmosphere pressure data and ambient temperature data, obtain polynomial fittings according to described multiple flow-pressure differential data groups, and characterize the dynamic impermeability of vehicle body with the coefficient of described polynomial fitting.
Wherein, in step S2, the computing formula of equivalent leakage area Ae is as follows:
Wherein, Q is charge flow rate, is measured by air flow sensor; μ is the coefficient of flow of air flowmeter, may calculate by Calibration Box and theory; Δ P is car inside and outside differential pressure, is measured by differential pressure pickup; D is surrounding air density, is obtained by following formula:
Wherein, P is ambient atmosphere pressure, is measured by atmosphere pressure sensor; T is environment temperature, is obtained by temperature sensor measurement; Ps, Ts and Ds are respectively atmospheric pressure, temperature and the atmospheric density under the status of criterion.The status of criterion, typically referring to temperature is that 0 DEG C (273.15 open) and pressure are the situation of 101.325 kPas (1 standard atmospheric pressure, 760 mm Hg), the density that now atmospheric density is air is 1.293g/L.
By gathering the test figure under the different speed of a motor vehicle, utilize above-mentioned formula, can draw the dynamic impermeability of vehicle body of testing automobile.When the dynamic impermeability of vehicle body that obtains in test is undesirable, can for example, detect the air leak position of vehicle body by external tool (stethoscope), these air leak positions are carried out to encapsulation process, carry out again impermeability detection, larger on the bubble-tight impact of vehicle body to judge the gas leakage of which position, and improve accordingly the hermetically-sealed construction of vehicle body, to make the dynamic airtight sexual satisfaction requirement of vehicle body, improve the comfortableness of taking.
In the present embodiment, preferably, step S1 is specially:
S11, obtain speed of a motor vehicle analog electrical signal, charge flow rate analog electrical signal, car inside and outside differential pressure analog electrical signal, ambient atmosphere pressure analog electrical signal and environment temperature simulation electric signal;
S12, determine the measured value of described speed of a motor vehicle analog electrical signal, charge flow rate analog electrical signal, car inside and outside differential pressure analog electrical signal, ambient atmosphere pressure analog electrical signal and environment temperature simulation electric signal, and according to vehicle speed data, charge flow rate data, car inner air and outer air pressure difference data, ambient atmosphere pressure data and the ambient temperature data of described measured value output digital electric signal form;
S13, described vehicle speed data, charge flow rate data, car inner air and outer air pressure difference data, ambient atmosphere pressure data and ambient temperature data are transferred to data processing module.
In the present embodiment, in step S2, " obtain polynomial fitting according to described multiple flow-pressure differential data groups " and be specially:
Store described multiple flow-pressure differential data group;
Described multiple flow-pressure differential data groups are imported to the process software in data processing module;
Process software calls spline interpolation program described multiple flow-pressure differential data groups is carried out to polynomial curve fitting, generate cubic spline curve and error analysis curve, the polynomial coefficient of digital simulation simultaneously, draw the polynomial fitting that characterizes flow-pressure differential relation according to the coefficient of polynomial fitting, characterize the dynamic impermeability of vehicle body with the coefficient of described polynomial fitting.Cubic spline functions computational accuracy is high, generally adopts it to do generate segmentation algebraic polynomial, curve and carry out error analysis.
This kind of characterizing method introduced error analysis control method " to characterize the dynamic impermeability of vehicle body with the coefficient of described polynomial fitting ", be after each group test data is all followed the numerical evaluation of piecewise fitting to compare, judge and adjusted, the error of trial value and calculated value is effectively controlled, more can portrays the impermeability characteristic of automobile accurate quantification.
This kind of characterizing method that " characterize the dynamic impermeability of vehicle body with the coefficient of described polynomial fitting ", on the one hand, it is right that the dynamic impermeability actual effect of various vehicle body encapsulation scheme that can the simple and quick instruction carriage to same development is opposed; On the other hand, be also conducive to that the instruction carriage of development is carried out to the dynamic impermeability of vehicle body with same level to mark vehicle and carry out contrast and analysis.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any amendments of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection domain of the present utility model.
Claims (3)
1. the trap for automobile dynamic air tightness detecting device that travels, it is characterized in that, this pick-up unit integral arrangement is on automobile, comprise vehicle speed sensor, air flow sensor, differential pressure pickup, atmosphere pressure sensor, data acquisition unit, data communication unit, data processing module, glazing panel, air connecting pipe and piezometric tube, one of them window frame sealing on described glazing panel and automobile arranges, on described glazing panel, be provided with pressure tap and air hole, one end of described air connecting pipe is inserted in described air hole and is communicated with atmosphere, the other end is connected with described air flow sensor, between described air connecting pipe and described air hole, sealing arranges, one end of described piezometric tube is inserted in described pressure tap and is communicated with atmosphere, the other end is connected with described differential pressure pickup, between described piezometric tube and described pressure tap, sealing arranges, wherein,
Described vehicle speed sensor, is connected to described data acquisition unit, for obtaining speed of a motor vehicle analog electrical signal;
Described air flow sensor, is connected to described data acquisition unit, for obtaining charge flow rate analog electrical signal;
Described differential pressure pickup, is connected to described data acquisition unit, for obtaining car inner air and outer air pressure reduction analog electrical signal;
Described atmosphere pressure sensor, is connected to described data acquisition unit, for obtaining ambient atmosphere pressure analog electrical signal;
Described temperature sensor, is connected to described data acquisition unit, for obtaining ambient atmosphere temperature simulation electric signal;
Described data acquisition unit, for determining the measured value of described speed of a motor vehicle analog electrical signal, charge flow rate analog electrical signal, car inside and outside differential pressure analog electrical signal, ambient atmosphere pressure analog electrical signal and environment temperature simulation electric signal, and according to vehicle speed data, charge flow rate data, car inner air and outer air pressure difference data, ambient atmosphere pressure data and the ambient temperature data of described measured value output digital electric signal form;
Described data communication unit, be connected between described data acquisition unit and described data processing module, for vehicle speed data, charge flow rate data, car inner air and outer air pressure difference data, ambient atmosphere pressure data and the ambient temperature data of described data acquisition unit output are transferred to described data processing module.
2. the trap for automobile according to claim 1 dynamic air tightness detecting device that travels, is characterized in that, described vehicle speed sensor is arranged on automobile driving axle or output shaft of gear-box.
3. the trap for automobile according to claim 1 and 2 dynamic air tightness detecting device that travels, is characterized in that, described data processing module is portable computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420008664.8U CN203772506U (en) | 2013-08-13 | 2014-01-07 | Dynamic air tightness detection device in case of automobile road driving |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320493569.7 | 2013-08-13 | ||
| CN201320493569 | 2013-08-13 | ||
| CN201420008664.8U CN203772506U (en) | 2013-08-13 | 2014-01-07 | Dynamic air tightness detection device in case of automobile road driving |
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| CN203772506U true CN203772506U (en) | 2014-08-13 |
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| CN201420008664.8U Expired - Fee Related CN203772506U (en) | 2013-08-13 | 2014-01-07 | Dynamic air tightness detection device in case of automobile road driving |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108982022A (en) * | 2018-06-01 | 2018-12-11 | 中南大学 | Car body is compared in contracting for air tightness test |
| CN112765814A (en) * | 2021-01-20 | 2021-05-07 | 中车唐山机车车辆有限公司 | Airtight performance maintaining design method based on full life cycle |
| CN113295350A (en) * | 2021-05-28 | 2021-08-24 | 中南大学 | System for obtaining dynamic air tightness index of train model and method, device and equipment for obtaining dynamic air tightness index of train |
-
2014
- 2014-01-07 CN CN201420008664.8U patent/CN203772506U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108982022A (en) * | 2018-06-01 | 2018-12-11 | 中南大学 | Car body is compared in contracting for air tightness test |
| CN108982022B (en) * | 2018-06-01 | 2020-08-28 | 中南大学 | Scaling vehicle body for air tightness test |
| CN112765814A (en) * | 2021-01-20 | 2021-05-07 | 中车唐山机车车辆有限公司 | Airtight performance maintaining design method based on full life cycle |
| CN113295350A (en) * | 2021-05-28 | 2021-08-24 | 中南大学 | System for obtaining dynamic air tightness index of train model and method, device and equipment for obtaining dynamic air tightness index of train |
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