CN113155386A - Heater for thermoacoustic combined test, test device and test method - Google Patents
Heater for thermoacoustic combined test, test device and test method Download PDFInfo
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- CN113155386A CN113155386A CN202110330606.1A CN202110330606A CN113155386A CN 113155386 A CN113155386 A CN 113155386A CN 202110330606 A CN202110330606 A CN 202110330606A CN 113155386 A CN113155386 A CN 113155386A
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- 238000012360 testing method Methods 0.000 title claims abstract description 111
- 238000010998 test method Methods 0.000 title claims abstract description 8
- 238000001816 cooling Methods 0.000 claims abstract description 59
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000010453 quartz Substances 0.000 claims abstract description 44
- 238000010438 heat treatment Methods 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 230000001788 irregular Effects 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 10
- 238000009434 installation Methods 0.000 claims description 9
- 239000000498 cooling water Substances 0.000 claims description 6
- 238000009661 fatigue test Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 description 7
- 238000013461 design Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000009304 pastoral farming Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
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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
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/027—Specimen mounting arrangements, e.g. table head adapters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
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Abstract
The invention belongs to the field of acoustic fatigue tests, and particularly relates to an arc quartz lamp heater for a thermoacoustic combined test, a thermoacoustic combined test device and a test method. The heater comprises a first water-cooling cavity (1) and a second water-cooling cavity (2) which are both arc-shaped structures; a plurality of quartz lamp tubes are arranged between the first water-cooling cavity (1) and the second water-cooling cavity (2) to form an arc-shaped heater for heating an irregular test piece; a water inlet and a water outlet are formed in the first water-cooling cavity (1) and the second water-cooling cavity (2) and are used for cooling clamping pieces at two ends of the quartz lamp tube; the two ends of the first water-cooling cavity (1) and the second water-cooling cavity (2) are both connected with a bottom cover (3), and the bottom cover (3) is used for supporting the water-cooling cavities.
Description
Technical Field
The invention belongs to the field of acoustic fatigue tests, and particularly relates to an arc quartz lamp heater for a thermoacoustic combined test, a thermoacoustic combined test device and a test method.
Background
The hypersonic aircraft has the characteristics of high maneuverability, long-distance accurate strike and the like, can effectively reduce attack time, enhances the penetration and defense capabilities, and is one of important development directions in the field of international aerospace. Meanwhile, the flight service environment is extremely harsh, and the local area exceeds 180dB due to high sound intensity noise generated by a propulsion system/boundary layer.
From the 60 s of the 20 th century, a room temperature noise test/acoustic fatigue test was carried out by the Beijing strength environmental institute, the Chinese academy of sciences, the Chinese airplane strength institute and the like for the metal wall plate structure of the airplane, and relevant design standards were established. In 2000, some colleges and universities developed partial relevant theories and numerical analysis researches for aero-engines and jet nozzle structures, thermal noise fatigue tests were less developed, domestic relevant researches were in the stage of just starting, and relevant test technologies (various load application, test measurement, data analysis and the like) corresponding to the national relevant researches were relatively slow to develop.
The quartz lamp heater is a widely used heating mode in the aircraft structure thermal test, and has the biggest advantages of small thermal inertia and convenient control. Laboratories in many countries today are dominated by the use of quartz lamp radiant heaters. From the viewpoint of aircraft structure research, the quartz lamp is most widely applied to structural thermal tests. Along with the continuous rise of the temperature, the failure rate of the electronic component is increased rapidly, an exponential function rule is presented, and the important function of the heating design on the equipment safety is required to be acknowledged. The thermal design is intended to keep the temperature of the components from exceeding a specified value and the cooling method chosen to meet the requirements of the environment in which the equipment is operating.
Disclosure of Invention
The purpose of the invention is as follows: on one hand, the designed heater can remarkably improve the current heating capacity, the heating process is stable, and the requirement of temperature tolerance is met; on the other hand, it has less influence on the uniformity of the sound field.
The technical scheme of the invention is as follows: on one hand, the heater for the thermoacoustic combined test is provided, and comprises a first water-cooling cavity 1 and a second water-cooling cavity 2 which are both arc-shaped structures;
a plurality of quartz lamp tubes are arranged between the first water-cooling cavity 1 and the second water-cooling cavity 2 to form an arc-shaped heater for heating irregular test pieces;
a water inlet and a water outlet are formed in the first water-cooling cavity 1 and the second water-cooling cavity 2 and are used for cooling clamping pieces at two ends of the quartz lamp tube; the two ends of the first water-cooling cavity 1 and the second water-cooling cavity 2 are both connected with a bottom cover 3, and the bottom cover 3 is used for supporting the water-cooling cavities.
Optionally, the heater further comprises: and the first pressing plate 4 and the second pressing plate 5 are correspondingly and respectively arranged on the side walls of the first water-cooling cavity 1 and the second water-cooling cavity 2 and are used for fixing the connecting cable of the quartz lamp tube.
Optionally, the heater further comprises: and the connecting positioning plate 7 is fixedly connected with the two bottom covers.
On the other hand, the test device for the thermoacoustic combined test comprises the heater and the traveling wave tube, wherein the heater is fixedly arranged on the test section of the traveling wave tube; and the tolerance of the sound field uniformity of the traveling wave tube is +/-3 dB.
Optionally, the heater further comprises: and the installation angle piece 8 is fixedly connected with the end part of the bottom cover 3, and the installation angle piece 8 is connected with the side wall of the traveling wave tube test section.
Optionally, the temperature control accuracy of the heater is ± 50 ℃.
In a further aspect, there is provided a method of testing a thermoacoustic combination test, using a test device as described above, the method comprising:
selecting a corresponding traveling wave tube according to the size of a test piece; determining the distance between the quartz lamp tube and the surface of the test piece according to the heating temperature, wherein the higher the heating temperature is, the closer the quartz lamp tube is required to be to the surface of the test piece;
step two, building a heating platform: a corresponding cooling water pipe outlet and a quartz lamp tube wire outlet are reserved on the traveling wave tube test section, and a heater is installed;
step three, debugging a heating system: checking whether the cooling water path works normally, inputting low voltage to check whether the quartz lamp tube works normally;
step four, performing thermoacoustic combined test: and the travelling wave tube is used for carrying out noise loading, and the heater is used for heating the test piece.
Optionally, the distance between the axes of the quartz lamp tubes is 10mm to 20mm, and the mounting position of the quartz lamp tubes is 40mm to 80mm from the surface of the test piece.
The invention has the technical effects that: at present, when a multi-field test is carried out, due to the limitation of fields, equipment and other conditions, other loading devices need to be carried by depending on a noise test environment, and a traveling wave tube is used as a main test device for providing a grazing incidence sound field and is installed in coordination with other loading test devices, so that the thermoacoustic combined test device is provided.
Along with the increasingly severe conditions of the multi-field test, the requirement of temperature loading is higher and higher, and the traditional multi-field test adopts a mode of placing a heater outside a traveling wave tube and heats the heater by utilizing heat radiation through quartz glass. Although the heating mode is convenient to install on site, higher heating temperature cannot be provided, and a better heating environment cannot be provided for the test piece with the irregular shape.
Compared with the heater design scheme in the traditional multi-field coupling test, the design scheme of the arc-shaped heater provided by the invention provides higher heating temperature by utilizing the mode of placing the heater in the traveling wave tube so as to meet the increasing test requirements, is different from the straight appearance of the traditional test piece, and also provides the mode of adopting the arc-shaped heater to match the irregular appearance of the test piece, so that the better heating effect is achieved, and the test capability is further improved.
The invention can provide a better heating environment for the related multi-field coupling test of the hypersonic aircraft, further meet the increasing test load demand, and has important guiding significance for the development of the multi-field coupling test technology.
Drawings
FIG. 1 is a schematic front view of an arcuate heater assembly;
FIG. 2 is a schematic axial view of a curved heater assembly.
Detailed Description
Example 1
In this embodiment, an arc quartz lamp heater for thermoacoustic combined test is provided, which is shown in fig. 1 and fig. 2, where fig. 1 is a schematic front view of the arc heater and fig. 2 is a schematic axial view of the arc heater, the arc quartz lamp heater includes a first water-cooling cavity 1 and a second water-cooling cavity 2, and the first water-cooling cavity 1 and the second water-cooling cavity 2 are both arc structures. A plurality of quartz lamp tubes are arranged between the first water-cooling cavity 1 and the second water-cooling cavity 2; the lamp tube chucks are installed on the sides of the first water-cooling cavity 1 and the second water-cooling cavity 2, and the quartz lamp tube is installed through the lamp tube chucks. The arc-shaped heater is formed to heat the irregular test piece.
The first water-cooling cavity 1 and the second water-cooling cavity 2 are provided with a water inlet and a water outlet, and the water inlet and the water outlet are connected with a water pipe 6 and used for cooling lamp tube chucks at two ends of a quartz lamp tube.
The two ends of the first water-cooling cavity 1 and the second water-cooling cavity 2 are both connected with a bottom cover 3, the bottom cover 3 is used for supporting the water-cooling cavity, and meanwhile, a cable of the quartz lamp tube conveniently penetrates through the bottom cover to be connected with the quartz lamp tube. The four bottom covers 3 of the embodiment are fixedly connected with the connecting and positioning plate 7 in a pairwise manner.
In addition, the side walls of the first water-cooling cavity 1 and the second water-cooling cavity 2 are correspondingly provided with a first pressing plate 4 and a second pressing plate 5 respectively, and the first pressing plate and the second pressing plate are used for fixing a connecting cable and a lamp tube chuck of the quartz lamp tube.
Example 2
In this embodiment, a testing apparatus for thermoacoustic combination test is provided, which includes the heater as described in embodiment 1, and further includes a traveling wave tube. The traveling wave tube of the embodiment can be a common traveling wave tube and comprises a horn section, a test section and an anechoic section, and the arc-shaped heater is installed in a cavity of the test section of the traveling wave tube.
In this embodiment, the end of the bottom cover 3 of the arc-shaped heater is fixedly connected with an installation angle piece 8, and the installation angle piece 8 is connected with the side wall of the traveling wave tube test section.
In addition, the tolerance of the sound field uniformity of the traveling wave tube is +/-3 dB. According to the load requirement of thermoacoustic combined test, the test device needs to be installed in a traveling wave tube and provides thermal load, and the requirement is not to cause excessive influence on the uniformity of a test sound field, and the tolerance is set to +/-3 dB.
Specifically, in this embodiment, 47 quartz lamps can be installed between the first water-cooling cavity 1 and the second water-cooling cavity 2, and the wheelbase between the lamps is different from 10mm to 20 mm; the first water-cooling cavity 1 and the second water-cooling cavity 2 are respectively provided with 2 water inlets and 2 water outlets for the water-cooling cavities to be communicated with water to cool the lamp holder clamping end. In this embodiment, the heater has a size of 570mm × 400mm × 900mm, and the water inlet/outlet pipes and the outlet grooves extend out of the top and bottom surfaces of the traveling wave tube. The quartz lamp tube is arranged at a position which is 40mm to 80mm away from the surface of the test piece, and can provide a heating temperature of not less than 800 ℃.
In the embodiment, the device is firstly installed inside the traveling wave tube and fixed by the installation angle sheet 8, and the distance between the lamp tube and the test piece can be adjusted by adjusting the position of the installation angle sheet 8, so that the situation that the lamp tube bursts in the test process due to too short distance is avoided, and the situation that the heating temperature cannot meet the test requirement due to too long distance is also avoided.
When the quartz lamp tube is used, the quartz lamp tubes are installed one by one and are clamped and installed by the lamp tube clamping heads, the lead wires are led out from the side, and the lead wires extend out of the bottom of the traveling wave tube from the four square wire outlet grooves below. After the lamp tube is installed, the cover plate is pressed tightly, the lamp tube is stably clamped in the test process, and then the water inlet pipe and the water outlet pipe are connected to provide cooling for the heater.
Example 3
In this embodiment, the test apparatus described in embodiment 2 is used to provide a test method of thermoacoustic combination test, and the specific test method is as follows:
step one, selecting a traveling wave tube. The corresponding traveling wave tube test device is selected according to the size of the test piece, the distance from the lamp tube to the surface of the test piece is determined according to the heating temperature, the heating temperature is higher, the quartz lamp tube needs to be closer to the surface of the test piece, the external environment temperature condition of normal work of the quartz lamp tube is considered, the heat radiated by the quartz lamp tube is influenced by the lamp tube after being reflected by the surface of the test piece due to the fact that the quartz lamp tube is too close to the test piece, and therefore the size parameter of the heater can be determined.
And step two, building a heating platform. And reserving a corresponding cooling water pipe outlet and a quartz lamp tube wire outlet on the traveling wave tube test device. When the test piece and the heater are installed, the test piece and the heater are installed in place. When the heater is installed, the installation is stable and reliable, so that the test effect is not influenced by vibration generated in the noise loading process.
And step three, debugging the heating system. Before the formal test, checking whether the cooling water channel works normally, and confirming that the phenomena of water seepage and water leakage do not exist; inputting low voltage to check whether the quartz lamp tube works normally; and confirming the safety of the field test environment, and keeping the personnel and the test equipment out of the safety distance.
And step four, performing a thermoacoustic combination test. And starting formal test after debugging is finished, gradually loading according to the load required by the test, and dividing the test process into a temperature rising section, a holding section and a temperature reduction section. And test data acquisition and recording are well carried out. The camera can be used for recording the field condition in the whole process, and the working reliability of the heater is checked after the test is finished. The following performance indicators for the heater were noted during the test:
(1) whether the designed water cooling system can meet the cooling requirement or not is ensured, and whether the temperature at the lamp tube chuck is too high in the whole test process or not is ensured to cause the lamp tube to burst so as to influence the test result;
(2) whether the arrangement form of the integrated arc-shaped lamp tube causes the phenomenon of overlarge thermal radiation interference between temperature zones so that the heating process cannot meet the requirement of a temperature control curve; the temperature control precision of the heater is +/-50 ℃;
(3) the requirement of meeting the heating condition simultaneously needs to guarantee that the heater installed into the traveling wave tube does not cause too big influence to the uniformity of the sound field, and the tolerance should be in the required range.
And step five, effect analysis. After the test is finished, the side cover plate of the traveling wave tube in the thermoacoustic combined test is found to be influenced to a certain extent due to overhigh temperature, and the side cover plate of the traveling wave tube adopts common stainless steel 0Cr18Ni9, so that the test can be performed by adopting an alloy material with better heat resistance. Other test results are as follows:
(1) after the cover plate is removed, the heater is stably installed and works normally, and looseness does not occur. The quartz lamp tube is intact and has no bursting condition in the heating process;
(2) after the test is finished, the measured values of all the microphones in the test process all meet the tolerance requirement, the sound field uniformity is not influenced by the heater arranged in the traveling wave tube, and the use requirement is met;
(3) after analyzing and comparing the heating data, the actual heating curve basically meets the control precision requirement (50 ℃) compared with the required temperature control curve.
Claims (8)
1. A heater for thermoacoustic combined test is characterized in that the heater comprises a first water-cooling cavity (1) and a second water-cooling cavity (2) which are both arc-shaped structures;
a plurality of quartz lamp tubes are arranged between the first water-cooling cavity (1) and the second water-cooling cavity (2) to form an arc-shaped heater for heating an irregular test piece;
a water inlet and a water outlet are formed in the first water-cooling cavity (1) and the second water-cooling cavity (2) and are used for cooling clamping pieces at two ends of the quartz lamp tube; the two ends of the first water-cooling cavity (1) and the second water-cooling cavity (2) are both connected with a bottom cover (3), and the bottom cover (3) is used for supporting the water-cooling cavities.
2. The heater for use in a thermoacoustic combination test according to claim 1, wherein the heater further comprises: the first pressing plate (4) and the second pressing plate (5) are correspondingly arranged on the side walls of the first water-cooling cavity (1) and the second water-cooling cavity (2) respectively and used for fixing a connecting cable of the quartz lamp tube.
3. The heater for use in a thermoacoustic combination test according to claim 1, wherein the heater further comprises: and the connecting positioning plate (7) is fixedly connected with the two bottom covers.
4. A test device for thermoacoustic combination testing, comprising a heater according to any one of claims 1 to 3, further comprising a traveling wave tube, said heater being fixedly mounted to a test section of the traveling wave tube; and the tolerance of the sound field uniformity of the traveling wave tube is +/-3 dB.
5. The testing device for thermoacoustic combination tests according to claim 4, wherein the heater further comprises: and the installation angle sheet (8) is fixedly connected with the end part of the bottom cover (3), and the installation angle sheet (8) is connected with the side wall of the travelling wave tube test section.
6. A test device for thermoacoustic combination tests according to claim 4, wherein the temperature control accuracy of the heater is within ± 50 ℃.
7. A method of testing a thermoacoustic combination test using the test device of claim 6, the method comprising:
selecting a corresponding traveling wave tube according to the size of a test piece; determining the distance between the quartz lamp tube and the surface of the test piece according to the heating temperature, wherein the higher the heating temperature is, the closer the quartz lamp tube is required to be to the surface of the test piece;
step two, building a heating platform: a corresponding cooling water pipe outlet and a quartz lamp tube wire outlet are reserved on the traveling wave tube test section, and a heater is installed;
step three, debugging a heating system: checking whether the cooling water path works normally, inputting low voltage to check whether the quartz lamp tube works normally;
step four, performing thermoacoustic combined test: and the travelling wave tube is used for carrying out noise loading, and the heater is used for heating the test piece.
8. The method of claim 7, wherein the axial distance between the quartz lamps is 10mm to 20mm, and the mounting position of the quartz lamps is 40mm to 80mm from the surface of the test piece.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110330606.1A CN113155386A (en) | 2021-03-26 | 2021-03-26 | Heater for thermoacoustic combined test, test device and test method |
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| CN202110330606.1A CN113155386A (en) | 2021-03-26 | 2021-03-26 | Heater for thermoacoustic combined test, test device and test method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114942146A (en) * | 2022-07-22 | 2022-08-26 | 西安交通大学 | Structural thermal assessment device and method with infrared radiation heating adjustment function |
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