CN112747915B - Spiral pipe natural frequency measuring device - Google Patents
Spiral pipe natural frequency measuring device Download PDFInfo
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- CN112747915B CN112747915B CN202110124041.1A CN202110124041A CN112747915B CN 112747915 B CN112747915 B CN 112747915B CN 202110124041 A CN202110124041 A CN 202110124041A CN 112747915 B CN112747915 B CN 112747915B
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- spiral pipe
- spiral
- bottom support
- natural frequency
- bolt
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- 238000012545 processing Methods 0.000 claims abstract description 16
- 230000001133 acceleration Effects 0.000 claims abstract description 15
- 239000000945 filler Substances 0.000 claims abstract description 12
- 238000012360 testing method Methods 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000012546 transfer Methods 0.000 claims description 2
- 230000005284 excitation Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000013461 design Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000006399 behavior Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a device for measuring the natural frequency of a spiral pipe, which belongs to the technical field of spiral pipes and comprises a spiral pipe, a pipe end fixing device and a natural frequency measuring system. The spiral pipe is spiral structure, and the pipe end is fixed on fixing device, and fixing device installs on the test bench. The fixing device is provided with a bolt, a fixing plate, a clamping plate and a bottom support, wherein the lower end of the fixing plate is connected with the clamping plate through the bolt, the clamping plate is connected with the bottom support through the bolt, and the bottom support is connected with the test bed through the bolt. The filler strips are connected to the inner side and the outer side of the spiral tube, the tube side is connected with a three-way acceleration sensor, and when the spiral tube vibrates, the three-way acceleration sensor can convert acceleration into signals and transmit the signals to the signal acquisition box through the signal processing circuit. The force sensor is arranged on the hammer head of the force hammer, the hammer head is in instantaneous force contact with the spiral pipe, the generated impact force enables the force sensor to receive signals, the signals are transmitted to the signal acquisition box through the signal processing circuit, and the computer receives a signal source obtained by the acquisition box for processing and analysis.
Description
Technical Field
The invention belongs to the technical field of spiral pipes, and particularly relates to a spiral pipe natural frequency measuring device.
Background
The spiral tube type steam generator has compact structure, higher heat transfer efficiency and good heat compensation performance, and has been developed and used in the fields of chemistry, industry, petroleum and the like. In the field of nuclear engineering, it is often used in small modular nuclear reactors. In the operation history of nuclear power plants, a considerable number of heat exchangers fail each year, and fluid-induced vibration inside the heat exchangers is a major cause of pipe breakage. For research on flow-induced vibration behaviors of heat exchange tubes, the most important premise is to obtain the natural frequency of the heat exchange tubes. If the low-order natural frequency of the spiral pipe is similar to the frequency generated by the exciting force of the fluid, system resonance can be caused, noise is generated when the system is light, collision among the spiral pipes is broken when the system is heavy, and personal and property safety is threatened. Therefore, to ensure personal and property safety, it is necessary to measure the natural frequency of the spiral pipe.
The fixing device and the filler strip form certain constraint on the spiral tube. And then the natural frequency of the spiral pipe is obtained by a 'force hammer excitation' method. A simple "force hammer excitation" method is commonly used in modal tests. The force hammer excitation method replaces the vibration exciter with a force hammer with a force sensor as an excitation tool, and the method has the advantages of short signal acquisition time, low cost and easy operation, and particularly, the condition that the connection of the vibration exciter can cause serious interference or additional mass to structural boundary conditions, so that the negative effects are greatly reduced, and the method is suitable for large, medium and small structures.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention aims to design a device for measuring the natural frequency of a spiral pipe, which is used for measuring the natural frequency of the spiral pipe.
The aim of the invention can be achieved by the following technical scheme:
A device for measuring the natural frequency of a spiral pipe comprises the spiral pipe, a pipe end fixing device and a natural frequency measuring device. The spiral tube is provided with filler strips which are respectively clamped at the inner side and the outer side of the spiral tube. The three-way acceleration sensor is arranged on the outer side of the spiral tube and connected to the signal box through a data line, and the signal box is connected to the computer. The two ends of the spiral tube are fixed on the fixing device, and the fixing device comprises a fixing clamping plate and a support. The fixed splint is fixed with spiral pipe end phase-match, fixed splint passes through splint with the bottom support and is connected, fixed plate and bottom support are connected to the splint, the support is fixed on the test bench.
The two ends of the spiral tube are fixed through the fixing device, so that the fixing constraint is achieved. When the natural frequency is measured, the spiral tube is uniformly distributed with the filler strip positions according to the requirements, and the spiral tube is enabled to vibrate freely through knocking by a force hammer. The force hammer is characterized in that a force sensor is arranged on the force hammer head, when the hammer head is in instant force contact with a workpiece, an impact force is generated, the force sensor receives a signal, then an instant waveform which is close to a half sine is generated, the signal is transmitted to a signal acquisition box, and finally the signal is transmitted to a computer for signal processing analysis.
In the above-mentioned spiral pipe natural frequency measuring device, spiral pipe both ends fixed plate, symmetry joint is at the spiral pipe end, and the fixed plate bulge is processed according to the pipe end arc and is made, and the diameter is less than spiral pipe diameter, and four bolt holes have been opened respectively from top to bottom to the fixed plate, and the fixed plate is screwed up through the bolt after the butt joint.
In the above-mentioned spiral pipe natural frequency measuring device, the splint of fixed plate lower extreme connection, two bolt holes have been opened respectively to the upside, and two symmetrical splint upside pass through bolted connection in the downside of fixed plate, and the downside of splint passes through bolted connection on the bottom support.
In the spiral pipe natural frequency measuring device, four bolt holes are formed in the position, connected with the two clamping plates, of the upper end of the bottom support, four bolt holes are formed in the position, connected with the test bed, of the bottom support, the upper side of the bottom support is connected with the lower side of the clamping plates through bolts, and the lower side of the bottom support is connected with the test bed through bolts.
In the device for measuring the natural frequency of the spiral pipe, the upper part, the middle part and the lower part of the filler strip are provided with three bolt holes, and the two filler strips are symmetrically arranged on the inner side and the outer side of the spiral pipe through bolts.
In the device for measuring the natural frequency of the spiral tube, the three-way acceleration sensor detects acceleration of the spiral tube during vibration, converts the acceleration into signals, and transmits the signals to the signal acquisition box through the signal processing circuit, so that the motion condition of the spiral tube in three directions can be obtained, and the device is small in size and light in weight.
In the above-described spiral pipe natural frequency measuring device, the signal processing circuit transmits the acceleration signal to the signal acquisition box.
In the above-mentioned spiral tube natural frequency measuring device, the signal collection box is used for collecting, amplifying and filtering the excitation signal and the response signal, and then is used as a signal source for computer analysis and processing.
In the device for measuring the natural frequency of the spiral pipe, the force hammer is used as an excitation tool, the spiral pipe is rapidly knocked to vibrate freely, and the time for acquiring signals through the force hammer is short, the cost is low and the operation is easy.
In the above-mentioned spiral tube natural frequency measuring device, the force sensor is mounted on the hammer head of the force hammer, when the hammer head is in instant force-applying contact with the workpiece, an impact force is generated, the impact force can make the force sensor receive the signal, then an instant waveform close to half sine is generated, and the instant waveform is transferred to the signal acquisition box through the signal processing circuit.
In the above-mentioned spiral pipe natural frequency measuring device, the computer processes and analyzes the signal source to obtain the spiral pipe natural frequency.
The invention has the beneficial effects that: fixing the two ends of the spiral tube through the fixing device, adding constraints such as filler strips and the like, and obtaining the natural frequency of the spiral tube by using a 'force hammer excitation' method, thereby providing assistance for subsequent research of the spiral tube; the device is convenient to detach and simple to operate, and provides reference for design of the spiral pipe end fixing device.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic illustration of a fixture;
FIG. 3 is a schematic view of the bottom bracket;
FIG. 4 is a schematic view of a fixation plate;
FIG. 5 is a schematic view of the mating of the coil and the fixture;
In the figure: 1. a spiral tube; 2. a fixing device; 3. a three-way acceleration sensor; 4. a filler strip; 5. a force sensor; 6. a force hammer; 7. a signal processing circuit; 8. a signal collection box; 9. a computer; 10. A bolt; 11. a fixing plate; 12. a clamping plate; 13. and a bottom support.
Detailed Description
The invention is further described below with reference to the drawings and examples, but the scope of the invention is not limited thereto.
Examples:
as shown in fig. 1, the device for measuring the natural frequency of the spiral pipe comprises the spiral pipe 1 and a fixing device 2, wherein the spiral pipe 1 is of a spiral structure, the fixing device 2 is installed on a test bed, the fixing device 2 comprises a bolt 10, a fixing plate 11, a clamping plate 12 and a bottom support 13, the upper end and the lower end of the fixing plate 11 are respectively fixed by the bolt 10, the lower end of the fixing plate 11 is connected with the clamping plate 12 and is fixed by the bolt 10, the clamping plate 12 is connected with the bottom support 13 through the bolt 10, and the bottom support 13 is connected on the test bed through the bolt 10. The inside and outside both sides of spiral pipe 1 are pressed from both sides by filler strip 4 and connect, the three-way acceleration sensor 3 is bonded to spiral pipe 1 pipe side, and when spiral pipe 1 vibrated, three-way acceleration sensor 3 can be with acceleration conversion signal transmission to signal acquisition box 8 through signal processing circuit 7. The force sensor 5 is arranged on the hammer head of the force hammer 6, the hammer head is in instantaneous force contact with the spiral tube 1, the generated impulse force enables the force sensor to receive signals, the signals are transmitted to the signal acquisition box 8 through the signal processing circuit 7, and the computer 9 receives a signal source obtained by the signal acquisition box 8 for processing and analysis.
Claims (4)
1. The utility model provides a spiral pipe natural frequency measuring device, includes spiral pipe (1) and fixing device (2), spiral pipe (1) is spiral structure, fixing device (2) are installed on the test bench, a serial communication port, fixing device (2) are equipped with bolt (10), fixed plate (11), splint (12) and bottom support (13), splint (12) are connected through bolt (10) to fixed plate (11) lower extreme, splint (12) are connected bottom support (13) through bolt (10), bottom support (13) are connected on the test bench through bolt (10), spiral pipe (1) inside and outside both sides are connected filler strip (4), spiral pipe (1) tube side is connected three-way acceleration sensor (3), when spiral pipe (1) vibrate, three-way acceleration sensor (3) are with acceleration conversion to signal through signal processing circuit (7) transfer to signal acquisition box (8), and the hammer head of force hammer (6) is installed in force transducer (5), and spiral pipe (1) instantaneous force-applying contact, and the force of production makes the force transducer receive the signal to be passed through signal processing circuit (7) and signal acquisition box (8) is carried out signal processing signal acquisition box (8) analysis source analysis, obtaining the natural frequency of the spiral pipe;
Two ends of the spiral tube (1) are fixedly connected to the fixing device (2);
The spiral tube (1) is provided with uniformly arranged filler strips (4), and the filler strips (4) are respectively clamped at the inner side and the outer side of the spiral tube.
2. The device for measuring the natural frequency of the spiral pipe according to claim 1, wherein the fixing plates (11) are symmetrically clamped at the ends of the spiral pipe, the protruding portions of the fixing plates (11) are manufactured according to pipe end arc processing, the diameter of the protruding portions is smaller than that of the spiral pipe, four bolt holes are formed in the upper portion and the lower portion of the fixing plates (11), and the fixing plates (11) are screwed up through bolts after being butted.
3. The device for measuring the natural frequency of the spiral pipe according to claim 1, wherein clamping plates (12) are connected to the lower end of the fixing plate (11), two bolt holes are respectively formed in the upper side and the lower side of the fixing plate (11), the upper sides of the two symmetrical clamping plates are connected to the lower side of the fixing plate (11) through bolts, and the lower side of the clamping plates (12) is connected to a bottom support (13) through bolts.
4. The device for measuring the natural frequency of the spiral pipe according to claim 1, wherein four bolt holes are formed in the position, connected with two clamping plates, of the upper end of the bottom support (13), four bolt holes are formed in the position, connected with a test bed, of the bottom support (13), the upper side of the bottom support (13) is connected with the lower side of the clamping plates through bolts, and the lower side of the bottom support (13) is connected with the test bed through bolts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110124041.1A CN112747915B (en) | 2021-01-29 | 2021-01-29 | Spiral pipe natural frequency measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110124041.1A CN112747915B (en) | 2021-01-29 | 2021-01-29 | Spiral pipe natural frequency measuring device |
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| Publication Number | Publication Date |
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| CN112747915A CN112747915A (en) | 2021-05-04 |
| CN112747915B true CN112747915B (en) | 2024-05-31 |
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| CN202110124041.1A Active CN112747915B (en) | 2021-01-29 | 2021-01-29 | Spiral pipe natural frequency measuring device |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113375900B (en) * | 2021-05-14 | 2023-05-12 | 东方电气集团科学技术研究院有限公司 | Method for testing amplitude and frequency response of flow-induced vibration of tube bundle structure |
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| KR20110062286A (en) * | 2009-12-03 | 2011-06-10 | 동아대학교 산학협력단 | Stiffness measuring device and method for bearing in actual shaft system |
| CN103837223A (en) * | 2014-03-07 | 2014-06-04 | 山东科技大学 | Inherent frequency measuring system and method of automobile steering system |
| CN104501941A (en) * | 2014-12-02 | 2015-04-08 | 苏州长风航空电子有限公司 | Method for testing the low-frequency inherent frequency of aircraft engine sensor |
| CN107907206A (en) * | 2017-11-15 | 2018-04-13 | 大连交通大学 | A kind of intrinsic frequency on-line detecting system |
| CN109738210A (en) * | 2019-03-15 | 2019-05-10 | 浙江众泰汽车制造有限公司 | A kind of automobile driving axle dynamic vibration absorber performance testing device and its test method |
| CN214502855U (en) * | 2021-01-29 | 2021-10-26 | 浙江工业大学 | Spiral tube natural frequency measuring device |
-
2021
- 2021-01-29 CN CN202110124041.1A patent/CN112747915B/en active Active
Patent Citations (7)
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| KR20110021271A (en) * | 2009-08-25 | 2011-03-04 | 한국프랜지공업 주식회사 | Apparatus for measuring natural frequency of dynamic damper |
| KR20110062286A (en) * | 2009-12-03 | 2011-06-10 | 동아대학교 산학협력단 | Stiffness measuring device and method for bearing in actual shaft system |
| CN103837223A (en) * | 2014-03-07 | 2014-06-04 | 山东科技大学 | Inherent frequency measuring system and method of automobile steering system |
| CN104501941A (en) * | 2014-12-02 | 2015-04-08 | 苏州长风航空电子有限公司 | Method for testing the low-frequency inherent frequency of aircraft engine sensor |
| CN107907206A (en) * | 2017-11-15 | 2018-04-13 | 大连交通大学 | A kind of intrinsic frequency on-line detecting system |
| CN109738210A (en) * | 2019-03-15 | 2019-05-10 | 浙江众泰汽车制造有限公司 | A kind of automobile driving axle dynamic vibration absorber performance testing device and its test method |
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| CN112747915A (en) | 2021-05-04 |
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