CN107192564A - A kind of pressure fluctuation fatigue experimental device of Train door - Google Patents
A kind of pressure fluctuation fatigue experimental device of Train door Download PDFInfo
- Publication number
- CN107192564A CN107192564A CN201610147626.4A CN201610147626A CN107192564A CN 107192564 A CN107192564 A CN 107192564A CN 201610147626 A CN201610147626 A CN 201610147626A CN 107192564 A CN107192564 A CN 107192564A
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- Prior art keywords
- pneumatic operated
- operated valve
- pipeline
- valve
- pressure fluctuation
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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
- G01M17/00—Testing of vehicles
- G01M17/08—Railway vehicles
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The present invention is a kind of pressure fluctuation fatigue experimental device of Train door, is related to pressure fluctuation fatigue test technology field.The present invention includes test loop, control assembly and measurement assembly；In test loop, mounting tool is assembled with testpieces, forms sealed test space, and mounting tool is connected with pipeline；In control assembly, PLC directly controls the first magnetic valve and the second magnetic valve, and then controls the first pneumatic operated valve and the second pneumatic operated valve, and power is provided for pneumatic operated valve by source of the gas, and according to test requirements document, either end or two ends of the assembling in pipeline；Measurement assembly is arranged on mounting tool and testpieces.A variety of pressure difference environments of experiment lab simulation aerodynamic loading formation can be achieved in the present invention, it can realize and uniform distributed load is applied to testpieces, pressure difference value and test frequency can be adjusted according to actual conditions, fully meet the pressure fluctuation fatigue test requirement that means of transport is produced because running at high speed to parts such as car door, vehicle windows.
Description
Technical field
The present invention relates to pressure fluctuation fatigue test technology field, and in particular to a kind of pressure arteries and veins of Train door
Dynamic fatigue experimental device, be particularly suitable for use in bear aerodynamic loading produce the high ferro of surface pressing pulsation, subway,
The car door fatigue test such as automobile.
Background technology
With the fast development of national high ferro, train running speed is more and more faster, and its security and comfortableness will
Seek also more and more higher.For the train that low speed is run, bullet train is intersected in tunnel by, open-wire line
And the aerodynamic loading that tunnel intersection etc. is produced under complex working condition is taken to the safety in operation of train and passenger
There is large effect in comfortableness, particularly belong to the car door in train body strength weak area.
Car door is the important component of train, not only with up and down passenger effect, also with sound insulation, every
The function such as heat and sealing is to ensure the riding comfort of interior.In train high-speed cruising, car door
Sealing make it that a pressure differential can be produced inside and outside car door under aerodynamic loading effect, and then causes car door
Deform.Because car door forms for multilayer material is gluing, and its top is provided with the windowpane of observation,
Therefore, it is difficult to carry out accurate car door Analysis of Fatigue Behavior by means such as theoretical calculation or mathematical simulations.
Only by simulating the pressure fluctuation fatigue test of actual pressure difference environment, the fatigue behaviour of car door could be examined.
At present, car body materials fatigue test is carried out both at home and abroad typically by the way of actual track experiment, that is, is arranged
Car is travelled on one or a few representational circuits, and related sensor is arranged on into key position, real
When measurement car body external load and its own response.But, this method has time-consuming, laborious, cost
The shortcomings of height, poor repeatability of test data.In addition, such actual the examination of road method can also take preciousness
Railway transportation resource, influence figure determines the normally travel of train.
The technological difficulties of pressure fluctuation fatigue test of the car door under aerodynamic loading environment are essentially consisted in：First,
Car door area is larger, and surface irregularity；Second, aerodynamic loading is uniformly distributed load；3rd, pressure
Pulsatile change frequency is determination value (being generally less than 2Hz)；4th, pressure fluctuation cycle-index is more (generally
More than 1000000 times).
The content of the invention
The present invention provides a kind of pressure fluctuation fatigue experimental device of Train door, can solve the problem that aforementioned four skill
Art problem, fully meets test requirements document, while having, efficiency high, energy consumption are low, cost is low, test data weight
The advantages of renaturation is good.
The technical scheme is that：
A kind of pressure fluctuation fatigue experimental device of Train door, including test loop, control assembly and measurement
Component；
Wherein, test loop includes mounting tool and pipeline, and control assembly includes the first magnetic valve, the first gas
Dynamic valve, the second pneumatic operated valve, the second magnetic valve, source of the gas, PLC and blower fan；
In test loop, mounting tool is assembled with testpieces, forms sealed test space；On mounting tool
Provided with two through holes, described two through holes are connected with pipeline respectively, and pipeline is divided into two branch roads；
In control assembly, the first pneumatic operated valve and the second pneumatic operated valve are separately positioned on two branch roads of pipeline, the
One pneumatic operated valve and the second pneumatic operated valve are connected with source of the gas respectively, and the first pneumatic operated valve and the second pneumatic operated valve are respectively with first
Magnetic valve and the second magnetic valve are connected, and the first magnetic valve and the second magnetic valve are connected with PLC respectively；
According to test requirements document, either end or two ends of the assembling in pipeline；
Measurement assembly is arranged on mounting tool and testpieces.
The measurement assembly include dial gauge, data collecting instrument, foil gauge and pressure sensor, dial gauge and
Foil gauge is arranged on the outside of testpieces, and pressure sensor is arranged on mounting tool, wherein, foil gauge and
Pressure sensor is connected with data collecting instrument respectively.
The control assembly also includes stop valve, and the stop valve is arranged on any one branch road of pipeline.
Two through holes on the mounting tool are arranged in mounting tool and testpieces connecting end surface opposite face
Portion is on the position of left and right edges, and two through holes are located at same horizontal line.
The pipeline selects external diameter 100mm pvc pipe.
The source of the gas is air accumulator or air compressor machine.
Beneficial effects of the present invention are：
A variety of pressure difference environments of experiment lab simulation aerodynamic loading formation can be achieved in the present invention, can be largely classified into
Three kinds of situations, i.e. negative pressure, malleation and the circulation of zero-mean positive/negative-pressure.It is larger in testpieces area, and surface
In the case of out-of-flatness, it can realize and uniform distributed load is applied to testpieces, can be according to actual conditions
Pressure difference value and test frequency are adjusted, the requirement of multiple pressure fluctuation circulation is met.The present invention has into simultaneously
This low, energy consumption is low, be easily assembled to, reproducible test data and the features such as good scalability, completely full
The pressure fluctuation fatigue test requirement that sufficient means of transport is produced because running at high speed to parts such as car door, vehicle windows.
Brief description of the drawings
Fig. 1 is test device systematic schematic diagram.
Wherein, 1- car doors, 2- dial gauges, 3- data collecting instruments, 4- foil gauges, 5- mounting tools, 6- pressures
Force snesor, 7- stop valves, the magnetic valves of 8- first, the pneumatic operated valves of 9- first, the pneumatic operated valves of 10- second, 11-
Two magnetic valves, 12- sources of the gas, 13-PLC controllers, 14- blower fans, 15- pipelines, arrow direction is air-flow
Direction.
Embodiment
The present invention is described further with reference to the accompanying drawings and examples.
The present invention is a kind of pressure fluctuation fatigue experimental device of Train door, in the side of Train door
Produce the pressure fluctuation of malleation or negative pressure or zero-mean positive/negative-pressure, and measurement pressure pulse value and car simultaneously
The displacement and strain of door and vehicle window.
As shown in figure 1, testpieces is car door 1, experimental rig of the present invention includes：Test loop, control
Component and measurement assembly；Wherein, test loop includes mounting tool 5 and pipeline 15, and control assembly includes cutting
Only valve 7, the first magnetic valve 8, the first pneumatic operated valve 9, the second pneumatic operated valve 10, the second magnetic valve 11, source of the gas
12nd, PLC 13 and blower fan 14, measurement assembly include dial gauge 2, data collecting instrument 3, foil gauge 4
With pressure sensor 6.In Fig. 1, arrow direction is airflow direction.
After mounting tool 5 in test loop is assembled with car door 1, the sealing cavity of formation is test space；
By changing the air pressure in the test space, to simulate the different gas that car door 1 is likely encountered in the process of running
Pressure condition, meets the pressure fluctuation fatigue test requirement of car door 1.Mounting tool 5 and testpieces connecting end surface
The middle part of opposite face is respectively provided with a through hole close to the position of left and right edges, and two through holes are located at same horizontal line
On, two through holes are connected with pipeline 15 respectively, and pipeline 15 is divided into two branch roads, i.e., propped up shown in Fig. 1
Road A and branch road B；Pvc pipe of the pipeline 15 from external diameter 100mm；Gas can be in pipeline 15, erector
Fill and flowed in 5 sealed circuits constituted with car door 1.
Stop valve 7 in control assembly is arranged on any one branch road of pipeline 15, is entered according to test requirements document
Row is set, it is ensured that air-flow one-way flow in test loop.On the branch road A and branch road B of pipeline 15 respectively
Be provided with the first pneumatic operated valve 9 and the second pneumatic operated valve 10, the first pneumatic operated valve 9 and the second pneumatic operated valve 10 simultaneously with gas
Source 12 is connected, and source of the gas 12 is air accumulator or air compressor machine, for the first pneumatic operated valve 9 and the second pneumatic operated valve 10
Power is provided；First pneumatic operated valve 9 and the second pneumatic operated valve 10 respectively with the first magnetic valve 8 and the second magnetic valve 11
It is connected, the first magnetic valve 8 and the second magnetic valve 11 are connected with PLC 13 simultaneously, PLC
13 directly the first magnetic valve 8 of control and the second magnetic valves 11, and then control the first pneumatic operated valve 9 and second pneumatic
The switch and time interval of valve 10.Blower fan 14 is arranged on the A ends or B ends of pipeline 15, can be set to
Exhausting or blowing pattern, can set different rotating speeds to produce the air-flow of friction speed.Control assembly
By reasonably setting, the pressure fluctuation fatigue test of given frequency and setting pressure value can be realized：Frequency
Adjust the opening/closing time of the first magnetic valve 8 and the second magnetic valve 11 to control by PLC 13, press
Force value is controlled by adjusting the rotating speed of blower fan 14.
Dial gauge 2 and foil gauge 4 in measurement assembly are arranged on the outside (relative to test space) of car door 1,
The real-time measurement to car door displacement and strain can be realized；Pressure sensor 6 is arranged on mounting tool 5,
The real-time measurement of pressure in the test space to car door 1 and the composition of mounting tool 5 can be realized；Wherein, should
Become piece 4 and pressure sensor 6 respectively with data collecting instrument 3 to be connected, measurement data can be carried out display with
Storage.
One group of embodiment is given below, the pressure difference environment to how to realize negative pressure, malleation and zero-mean positive/negative-pressure
It is specifically described.
First, subnormal ambient：
Blower fan 14 is arranged on the A ends of pipeline 15, is set to exhausting pattern；Open when the first pneumatic operated valve 9 and
When second pneumatic operated valve 10 is closed, negative pressure state is in the test space that car door 1 is constituted with mounting tool 5；
When the first pneumatic operated valve 9 is closed and the second pneumatic operated valve 10 is opened, the experiment that car door 1 is constituted with mounting tool 5
Normal atmosphere pressure condition is in space；Move in circles successively.
Second, positive pressure environment：
Blower fan 14 is arranged on the B ends of pipeline 15, is set to blowing pattern；Open when the second pneumatic operated valve 10 and
When first pneumatic operated valve 9 is closed, barotropic state is in the test space that car door 1 is constituted with mounting tool 5；
When the second pneumatic operated valve 10 is closed and the first pneumatic operated valve 9 is opened, the experiment that car door 1 is constituted with mounting tool 5
Normal atmosphere pressure condition is in space；Move in circles successively.
3rd, zero-mean positive/negative-pressure environment：
Two Fans 14 are separately mounted to the side a and b of pipeline 15, are respectively set to exhausting pattern and blow
Wind pattern；When the second pneumatic operated valve 10 is opened and the first pneumatic operated valve 9 is closed, 5 groups of car door 1 and mounting tool
Into test space in be in barotropic state；When the first pneumatic operated valve 9 is opened and the second pneumatic operated valve 10 is closed,
Negative pressure state is in the test space that car door 1 is constituted with mounting tool 5；Move in circles successively.
The installation test procedure of experimental rig of the present invention is：
Step one, car door 1 is fixed on mounting tool 5, forms closed test space；
Step 2, by the pneumatic operated valve 9 of pipeline 15 and first, the second pneumatic operated valve 10, stop valve 7 and erector
Fill 5 to be attached, constitute test loop；
Step 3, according to the requirement of negative pressure in test space or malleation, blower fan 14 is arranged on the A of pipeline 15
End or B ends；
Step 4, by the first magnetic valve 8, the first pneumatic operated valve 9, source of the gas 12, the second pneumatic operated valve 10, second
Magnetic valve 11 passes sequentially through flexible pipe and is connected, and PLC 13 is electric with the first magnetic valve 8 and second respectively
Magnet valve 11 is connected by wire, composition control component；
Step 5, installs dial gauge 2, foil gauge 4 and pressure sensor 6, and foil gauge 4 and pressure are passed
Sensor 6 is connected with data collecting instrument 3, constitutes measurement assembly；
Step 6, according to test requirements documents such as pressure value and frequencies, rotating speed and the first magnetic valve to blower fan 14
8 and second the opening/closing time of magnetic valve 11 be adjusted；
Step 7, is powered to blower fan 14, control assembly, measurement assembly, and pressure fluctuation fatigue test is opened
Begin；
In step 8, process of the test, the first pneumatic operated valve 9 and the second pneumatic operated valve 10 are alternately closed, so that
There is given pressure difference environment in test space.
Embodiments of the invention are explained in detail above, above-mentioned embodiment is only the optimal reality of the present invention
Example is applied, but the present invention is not limited to above-described embodiment, the knowledge possessed in those of ordinary skill in the art
In the range of, it can also be made a variety of changes on the premise of present inventive concept is not departed from.
Claims (6)
1. a kind of pressure fluctuation fatigue experimental device of Train door, it is characterised in that：Including test loop,
Control assembly and measurement assembly；
Wherein, test loop includes mounting tool (5) and pipeline (15), and control assembly includes the first electromagnetism
Valve (8), the first pneumatic operated valve (9), the second pneumatic operated valve (10), the second magnetic valve (11), source of the gas (12),
PLC (13) and blower fan (14)；
In test loop, mounting tool (5) is assembled with testpieces, forms sealed test space；Erector
(5) are filled provided with two through holes, described two through holes are connected with pipeline (15) respectively, pipeline (15) quilt
It is divided into two branch roads；
In control assembly, the first pneumatic operated valve (9) and the second pneumatic operated valve (10) are separately positioned on pipeline (15)
Two branch roads on, the first pneumatic operated valve (9) and the second pneumatic operated valve (10) are connected with source of the gas (12) respectively,
First pneumatic operated valve (9) and the second pneumatic operated valve (10) respectively with the first magnetic valve (8) and the second magnetic valve (11)
It is connected, the first magnetic valve (8) and the second magnetic valve (11) are connected with PLC (13) respectively；Wind
Machine (14) is arranged on either end or the two ends of pipeline (15)；
Measurement assembly is arranged on mounting tool (5) and testpieces.
2. a kind of pressure fluctuation fatigue experimental device of Train door as claimed in claim 1, it is characterised in that：
The measurement assembly includes dial gauge (2), data collecting instrument (3), foil gauge (4) and pressure sensor (6),
Dial gauge (2) and foil gauge (4) are arranged on the outside of testpieces, and pressure sensor (6), which is arranged on, to be installed
In frock (5), wherein, foil gauge (4) and pressure sensor (6) respectively with data collecting instrument (3)
It is connected.
3. a kind of pressure fluctuation fatigue experimental device of Train door as claimed in claim 1, it is characterised in that：
The control assembly also includes stop valve (7), and the stop valve (7) is arranged on any one of pipeline (15)
On individual branch road.
4. a kind of pressure fluctuation fatigue experimental device of Train door as claimed in claim 1, it is characterised in that：
It is relative with testpieces connecting end surface that two through holes on the mounting tool (5) are arranged at mounting tool (5)
The middle part in face is on the position of left and right edges, and two through holes are located at same horizontal line.
5. a kind of pressure fluctuation fatigue experimental device of Train door as claimed in claim 1, it is characterised in that：
Pvc pipe of the pipeline (15) from external diameter 100mm.
6. a kind of pressure fluctuation fatigue experimental device of Train door as claimed in claim 1, it is characterised in that：
The source of the gas (12) is air accumulator or air compressor machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610147626.4A CN107192564A (en) | 2016-03-15 | 2016-03-15 | A kind of pressure fluctuation fatigue experimental device of Train door |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610147626.4A CN107192564A (en) | 2016-03-15 | 2016-03-15 | A kind of pressure fluctuation fatigue experimental device of Train door |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107192564A true CN107192564A (en) | 2017-09-22 |
Family
ID=59871056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610147626.4A Pending CN107192564A (en) | 2016-03-15 | 2016-03-15 | A kind of pressure fluctuation fatigue experimental device of Train door |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107192564A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107941446A (en) * | 2017-12-13 | 2018-04-20 | 中铁第四勘察设计院集团有限公司 | A kind of repeated impact test device suitable for tunnel protection door |
| CN111425659A (en) * | 2020-03-25 | 2020-07-17 | 厚力德机器（杭州）有限公司 | All-through vacuum interface diaphragm valve fatigue test system |
| CN111811760A (en) * | 2020-08-12 | 2020-10-23 | 中国人民解放军海军工程大学 | Plate frame model strength/rigidity test system |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003075315A (en) * | 2001-09-05 | 2003-03-12 | Tatsuo Sakai | Fatigue tester and multiple fatigue tester system |
| CN101776513A (en) * | 2010-02-04 | 2010-07-14 | 中南大学 | High-speed train body alternation pneumatic load test device |
| CN102012320A (en) * | 2010-11-03 | 2011-04-13 | 南京康尼机电股份有限公司 | Wind pressure fatigue test device and test method |
| CN103728143A (en) * | 2014-01-18 | 2014-04-16 | 淄博水环真空泵厂有限公司 | High-speed train load fatigue and comfort testing system and testing method |
| CN103968727A (en) * | 2013-02-04 | 2014-08-06 | 上海安莱德汽车零部件有限公司 | Multifunctional car door size detecting device |
| CN104677624A (en) * | 2015-03-19 | 2015-06-03 | 天津航天瑞莱科技有限公司苏州分公司 | Air pressure fatigue load test method and device for train window |
| CN204902706U (en) * | 2015-08-20 | 2015-12-23 | 广州凌云新锐汽车零部件有限公司 | Utensil is examined to door assembly |
| CN105334040A (en) * | 2015-11-27 | 2016-02-17 | 西南交通大学 | Research test bed for fatigue strength and load spectra of proportional vehicle body under multi-point excitation load |
| CN205538257U (en) * | 2016-03-15 | 2016-08-31 | 北京强度环境研究所 | Pressure fluctuation fatigue test device of train door |
-
2016
- 2016-03-15 CN CN201610147626.4A patent/CN107192564A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003075315A (en) * | 2001-09-05 | 2003-03-12 | Tatsuo Sakai | Fatigue tester and multiple fatigue tester system |
| CN101776513A (en) * | 2010-02-04 | 2010-07-14 | 中南大学 | High-speed train body alternation pneumatic load test device |
| CN102012320A (en) * | 2010-11-03 | 2011-04-13 | 南京康尼机电股份有限公司 | Wind pressure fatigue test device and test method |
| CN103968727A (en) * | 2013-02-04 | 2014-08-06 | 上海安莱德汽车零部件有限公司 | Multifunctional car door size detecting device |
| CN103728143A (en) * | 2014-01-18 | 2014-04-16 | 淄博水环真空泵厂有限公司 | High-speed train load fatigue and comfort testing system and testing method |
| CN104677624A (en) * | 2015-03-19 | 2015-06-03 | 天津航天瑞莱科技有限公司苏州分公司 | Air pressure fatigue load test method and device for train window |
| CN204902706U (en) * | 2015-08-20 | 2015-12-23 | 广州凌云新锐汽车零部件有限公司 | Utensil is examined to door assembly |
| CN105334040A (en) * | 2015-11-27 | 2016-02-17 | 西南交通大学 | Research test bed for fatigue strength and load spectra of proportional vehicle body under multi-point excitation load |
| CN205538257U (en) * | 2016-03-15 | 2016-08-31 | 北京强度环境研究所 | Pressure fluctuation fatigue test device of train door |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107941446A (en) * | 2017-12-13 | 2018-04-20 | 中铁第四勘察设计院集团有限公司 | A kind of repeated impact test device suitable for tunnel protection door |
| CN111425659A (en) * | 2020-03-25 | 2020-07-17 | 厚力德机器（杭州）有限公司 | All-through vacuum interface diaphragm valve fatigue test system |
| CN111425659B (en) * | 2020-03-25 | 2021-11-23 | 艾迪机器(杭州)有限公司 | All-through vacuum interface diaphragm valve fatigue test system |
| CN111811760A (en) * | 2020-08-12 | 2020-10-23 | 中国人民解放军海军工程大学 | Plate frame model strength/rigidity test system |
| CN111811760B (en) * | 2020-08-12 | 2022-08-19 | 中国人民解放军海军工程大学 | Plate frame model strength/rigidity test system |
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