CN113176083B - Vibration response characteristic test system and method for tubular vortex reducer - Google Patents
Vibration response characteristic test system and method for tubular vortex reducer Download PDFInfo
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- CN113176083B CN113176083B CN202110419602.0A CN202110419602A CN113176083B CN 113176083 B CN113176083 B CN 113176083B CN 202110419602 A CN202110419602 A CN 202110419602A CN 113176083 B CN113176083 B CN 113176083B
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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
- G01M13/00—Testing of machine parts
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- 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
- G01M7/025—Measuring arrangements
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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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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a vibration response characteristic test system and a vibration response characteristic test method of a tubular vortex reducer, wherein the vibration response characteristic test system of the tubular vortex reducer comprises the following components: an input section for inputting an excitation signal; the test part is used for testing the non-rotary vibration response characteristic of the tubular vortex reducer according to the excitation signal to obtain test result data; and the output part is used for outputting the test result data. The invention can realize the measurement of the vibration and response characteristics of the tubular vortex reducer, and has important significance for deeply knowing the action mechanism of the tubular vortex reducer, inhibiting the vibration of the vortex reducer and exploring the rule of the coupling vibration of the tubular vortex reducer and the air entraining disc.
Description
Technical Field
The invention belongs to the technical field of vibration characteristic measurement, and particularly relates to a vibration response characteristic test system and method of a tubular vortex reducer.
Background
In an aircraft engine secondary air system, the bleed air flow path is designed to absorb heat from the high heat load turbine disk, prevent hot gases from being drawn into the cavity between the turbine disks from the main turbine gas passage, and seal the bearing chamber from oil and gas leakage.
The internal air-entraining mode adopted at present is to radially and inwardly drain air from the drum cylinder of the high-pressure compressor to the high-pressure shaft, and the air-entraining mode can avoid adding an external pipeline and improve the air-entraining safety. However, the air flow obtained in this way is influenced by the rotation, which forms strong vortices in the disc cavity, resulting in a large flow pressure loss. In order to solve the problem of large energy loss of air flowing in the cavity of the rotating disk, various vortex reducer structures are usually installed in the cavity of the rotating disk to limit the rotation of the air and guide the air to flow radially. The tubular vortex reducer is a structure that a set of radial vortex reducing pipes are arranged in a disc cavity of the air compressor, so that the air flow can be effectively prevented from generating larger circumferential speed, the vortex is restrained, and the loss of pressure in the disc can be effectively reduced. However, due to the "tube organ effect", the tube is prone to vibration under the action of the air flow excitation, and cracking is caused by high cycle fatigue.
At present, research on vortex reducers focuses on flow characteristic analysis for reducing free vortex and reducing pressure drop loss, but research on vibration characteristics and structural damping optimization of the vortex reducers is relatively few, and experimental research on the vibration characteristics of the vortex reducers is more recently reported. As a key hot end component in an aeroengine, the tubular vortex reducer is involved in complex nonlinear fluid-solid coupling action and airflow exciting force action when working in a compressor disc cavity, has more influence factors and complex vibration mechanism, and can generate non-negligible vibration problem under the combined action of vortex and rotor in the disc cavity, thereby threatening the vibration safety of a turbine disc, so that the analysis and development experimental study on the vibration response characteristics of the vortex reducer are necessary.
In view of the foregoing, there is a need for a new system and method for testing the vibration response characteristics of a tubular vortex breaker.
Disclosure of Invention
The invention aims to provide a vibration response characteristic testing system and method for a tubular vortex breaker, which are used for solving one or more technical problems. The invention can realize the measurement of the vibration and response characteristics of the tubular vortex reducer, and has important significance for deeply knowing the action mechanism of the tubular vortex reducer, inhibiting the vibration of the vortex reducer and exploring the rule of the coupling vibration of the tubular vortex reducer and the air entraining disc.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention relates to a vibration response characteristic test system of a tubular vortex reducer, which comprises the following components:
an input section for inputting an excitation signal;
the test part is used for testing the non-rotary vibration response characteristic of the tubular vortex reducer according to the excitation signal to obtain test result data; the tubular vortex breaker comprises an air-entraining pipe to-be-tested piece and an air-entraining disc; the test section includes:
vortex breaker foundation fixing device includes: clamping blocks, air entraining discs and pressing blocks; the pressing block is used for being fixedly connected with the vibration isolation foundation platform, the clamping block is detachably and fixedly arranged on the pressing block, and the clamping block is used for mounting the air-entraining pipe to-be-detected piece and the air-entraining disc;
the top force load applying and measuring device is used for applying a top force to the air entraining pipe to-be-detected piece and the air entraining disc and measuring an applied load value;
the exciting force applying and measuring device is used for applying exciting force to the air entraining pipe to-be-detected piece and the air entraining disc and measuring the applied load value;
the vortex reducer vibration response measuring device comprises an eddy current displacement sensor and an acceleration sensor and is used for realizing vibration response measurement of a piece to be measured of the air entraining pipe;
and the output part is used for outputting the test result data.
A further improvement of the present invention is that the input section includes:
a function signal generator for generating a sinusoidal steady-state signal;
the power amplifier is used for amplifying the sinusoidal steady-state signal to obtain an amplified signal; the amplified signal is used as an excitation signal for the test section.
A further improvement of the present invention is that the top force load applying and measuring device comprises: the hydraulic jack comprises an oil pump, an oil pressure gauge, a jack and a jacking block; the oil pump is communicated with the oil inlet of the jack through the oil pressure gauge, and the jacking block is fixedly arranged at the jacking force output end of the jack.
A further improvement of the present invention is that the exciting force applying and measuring device includes: the vibration exciter, the vibration exciting rod and the dynamic force sensor; the input end of the vibration exciter is used for receiving the excitation signal, the output end of the vibration exciter is fixedly connected with one end of the vibration exciting rod, and the other end of the vibration exciting rod is used for being connected with a piece to be detected of the air entraining pipe; the dynamic force sensor is arranged on the excitation rod.
The invention further improves that the exciting rod is a flexible threaded connecting rod with a variable cross section and a narrow middle and wide two ends.
A further improvement of the present invention is that the output section includes: the data acquisition device is used for acquiring data acquired by the eddy current displacement sensor and the acceleration sensor; and the computer is used for storing and displaying the data acquired by the data acquisition device.
The invention relates to a method for testing vibration response characteristics of a tubular vortex reducer, which is based on the system disclosed by the invention and comprises the following steps of:
the method comprises the steps of installing an air entraining pipe to-be-detected piece and an air entraining disc on a clamping block through bolts, applying a top force load through a top force load applying and measuring device, monitoring a load value, and obtaining the top force load used in the test process;
connecting an exciting force applying and measuring device with a blade of a piece to be detected of the air entraining pipe, and transmitting a simple harmonic steady vibration signal to the piece to be detected of the air entraining pipe to realize exciting force loading; wherein, the amplitude of the exciting force is stabilized on a preset value by monitoring the load value of the exciting force;
measuring and obtaining vibration displacement responses of the different positions of the length of the air guide pipe by adopting a sensor; changing the excitation frequency to obtain an amplitude-frequency response curve of the induced air pipe at each measuring point; changing the amplitude of exciting force to obtain a vibration frequency response curve under the load action of the exciting force with different amplitude; and replacing the air-entraining pipe to-be-tested pieces with different lengths, diameters and fit clearances to obtain the change curves of the vibration and response characteristics of the air-entraining pipe under different structural parameters.
The invention is further improved in that when the top force load used in the test process is obtained, a force hammer knocking method is adopted to measure and obtain the damping response curve of the free vibration of the air entraining pipe to be tested, and the natural frequency of the vortex breaker is obtained through frequency spectrum analysis;
natural frequency f of nth loaded induced draft tube to-be-measured piece n Natural frequency f from n-1 th time n-1 When the relative error is smaller than a preset value, the load corresponding to the nth loading is used as the top force load used in the experimental test process.
The invention further improves that the bleed air pipe to-be-detected piece comprises a bleed air pipe to-be-detected piece with a damping pipe and a bleed air pipe to-be-detected piece without the damping pipe.
The invention further improves that when the air entraining pipe to be measured piece with the damping pipe is adopted, the invention further comprises: and replacing damping tube models with different lengths, grooving numbers and grooving depths to obtain change curves of the vibration and response characteristics of the air entraining tube under different damping tube structural parameters.
Compared with the prior art, the invention has the following beneficial effects:
the invention can realize the measurement of the vibration and response characteristics of the tubular vortex reducer, and has important significance for deeply knowing the action mechanism of the tubular vortex reducer, inhibiting the vibration of the vortex reducer and exploring the rule of the coupling vibration of the tubular vortex reducer and the air entraining disc.
According to the invention, the air-guiding pipe and the air-guiding disk are connected to the clamping block in a detachable mode (can be bolts), so that the air-guiding pipe is convenient to detach and replace, and the change curves and influence rules of structural parameters of different air-guiding pipes and damping pipes on vibration and response characteristics can be explored by replacing the model of the air-guiding pipe to-be-tested piece.
In the invention, the centrifugal force effect under the rotation condition is equivalent to the vortex reducer under the non-rotation condition by adopting a mode of applying a top force load, the displacement constraint in the axial direction and the radial direction which are actually born is equivalent by adopting a mode of fastening bolts on the clamping blocks, the cost of an experimental section and the concern of experimental safety are greatly reduced, and the top force load can be regulated by an oil pump and monitored by an oil pressure meter, thereby being convenient for manual fine control and initiative operation.
According to the invention, the fastening state between the vortex reducer and the clamping block is obtained by adopting a force hammer knocking method, the operation is simple and easy to implement, and the excitation is applied by adopting the variable-section flexible excitation rod, so that the influence of additional constraint on the vibration characteristic of the vortex reducer is eliminated, and the measurement precision is improved.
The testing method provided by the invention has the advantages of high repeatability and wide applicability, the clamping blocks are designed to be detachable and can be adapted according to the form of the to-be-tested piece, and various key components which are concerned with vibration characteristics in turbine machinery can be measured, such as various vortex reducers, damping blades, gold-drawing blades and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description of the embodiments or the drawings used in the description of the prior art will make a brief description; it will be apparent to those of ordinary skill in the art that the drawings in the following description are of some embodiments of the invention and that other drawings may be derived from them without undue effort.
FIG. 1 is a schematic block diagram of a tubular vortex breaker non-rotational vibration response characteristic experimental test system in accordance with an embodiment of the present invention;
FIG. 2 is a schematic diagram of a test system for experimental non-rotational vibration response characteristics of a tubular vortex breaker in accordance with an embodiment of the present invention;
FIG. 3 is a schematic view of a vortex breaker fixture and a top load applying and measuring device in an embodiment of the invention;
FIG. 4 is a schematic view of an excitation force application and measurement device according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a vortex breaker vibration response measurement apparatus in accordance with an embodiment of the present invention;
FIG. 6 is a flow chart of a test method for experimental non-rotational vibration response characteristics of a tubular vortex breaker according to an embodiment of the present invention; fig. 6 (a) is a schematic flow diagram of a bleed pipe model in which the part to be measured is an undamped pipe, and fig. 6 (b) is a schematic flow diagram of a bleed pipe model with a damped pipe;
in fig. 1 to 6, a 1-function signal generator; a 2-power amplifier; 3-vibration exciter; 4-exciting rod; 5-dynamic force sensor; 6-clamping blocks; 7-a top block; 8-jack; 9-a rack; 10-an air entraining pipe to-be-detected piece; 11-an air entraining tray; 12-a sensor; 13-a data collector; 14-a computer; 15-oil pressure gauge; 16-an oil pump; 17-a sensor support; 18-brackets; 19-mounting a nut; 20-briquetting.
Detailed Description
In order to make the purposes, technical effects and technical solutions of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention are clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it will be apparent that the described embodiments are some of the embodiments of the present invention. Other embodiments, which may be made by those of ordinary skill in the art based on the disclosed embodiments without undue burden, are within the scope of the present invention.
Referring to fig. 1 and 2, a system for testing non-rotational vibration response characteristics of a tubular vortex breaker according to an embodiment of the present invention mainly comprises an input portion, a testing portion and an output portion.
The input section includes: a function signal generator 1 and a power amplifier 2; the function signal generator 1 generates a sine steady-state signal with a certain frequency, and the sine steady-state signal is amplified by the power amplifier 2 and then used as an input excitation signal of the system;
the testing part mainly comprises a vortex reducer foundation fixing device, a top force load applying and measuring device, an exciting force applying and measuring device, a vortex reducer vibration response measuring device and the like.
In an embodiment of the present invention, the vortex breaker base fixing device includes: the device comprises a bench 9, a clamping block 6, a bleed disc 11 and a bleed pipe to-be-tested piece 10 (comprising a bleed pipe to-be-tested piece without a damping pipe and a bleed pipe to-be-tested piece with a damping pipe). The two side racks 9 are arranged on a vibration isolation foundation platform, the bottom plates of the two side racks are fastened through foundation bolts, and the tops of the two side racks are connected through cross beams with threads at two ends. The bleed pipe to-be-tested piece 10 and the bleed disc 11 are fastened on the clamping blocks in the axial direction and the radial direction through bolts, and displacement constraint suffered in actual work is simulated.
The top force load applying and measuring device includes: the hydraulic oil pump 16, the oil pressure gauge 15, the jack 8, the jacking block 7 and the pressing block 20.
The exciting force applying and measuring device includes: the vibration exciter 3, the vibration exciting rod 4 with variable cross section and the dynamic force sensor 5.
The vibration response measuring device of the vortex breaker is composed of a sensor supporting frame 17 and a sensor 12 of a preset type, wherein the sensor 12 of the preset type comprises an eddy current displacement sensor and an acceleration sensor. The sensor support frame 17 is fixed on the base of the rack 9, the eddy current displacement sensor and the acceleration sensor are respectively arranged on a bracket 18 extending out of the sensor support frame 17, and the positions of the bracket 18 and the mounting nut 19 are adjusted, so that a proper measuring gap is kept between the head of the sensor 12 and the surface of the measured point of the air entraining pipe to-be-measured piece 10.
The output part comprises a multi-channel data collector 13 and a computer 14, and the data signals acquired by the multi-channel data collector 13 are output to the computer 14 for display and storage so as to be further debugged and analyzed.
In the test system of the embodiment of the invention, a damping response curve of free vibration of the vortex breaker is measured by adopting a force hammer knocking method, and the natural frequency of the vortex breaker is obtained through spectrum analysis; the air guide pipe and the air guide disk are fastened on the clamping blocks in the axial direction and the radial direction through bolts, and displacement constraint of the vortex breaker in actual work is simulated; loading the air entraining pipe to be tested into a complete fastening state by measuring natural frequency, and taking the load corresponding to the complete fastening state as a top force load used in the experimental test process; the exciting force is applied by adopting a variable-section flexible threaded connecting rod with a narrow middle and two wide sides, so that tangential load generated by the exciter is fully consumed by the thin rod part under the self flexibility, and the influence of additional constraint on the vortex reducer is eliminated; the design of the clamping blocks is adopted, so that the vortex breaker model to be tested in the experiment is convenient to replace; the test is carried out on two air-entraining pipe to-be-tested pieces of the air-entraining pipe without the damping pipe and the air-entraining pipe with the damping pipe, and the damping effect of the damping pipe in the vibration process can be compared and explored; the change curves and influence rules of different bleed air pipe structural parameters on vibration and response characteristics can be explored by changing the to-be-tested bleed air pipe models with different lengths, different diameters and different fit clearances; by replacing clamping blocks matched with the to-be-tested piece of the air entraining pipe, the test system can measure vibration response characteristics of various vortex reducers and damping blades.
Referring to fig. 3, in the vortex breaker fixing apparatus, the top load applying and measuring apparatus according to the embodiment of the present invention, a jack 8 is placed on a base of a stand 9, and is installed in a top block 7 and connected to a pressing block 20 by a side bolt. The pressing block 20 is fixed on the rack 9, and the upper end face of the pressing block 20 is screwed into the top block 7, so that the top block 7 and the pressing block 20 are integrated. The oil pump 16 and the oil pressure gauge 15 are connected with the jack 8, the vortex reducer is jacked up according to the required jacking force by adjusting the oil pump 16, and the jacking force value is read on the oil pressure gauge 15. The air guide pipe and the air guide disk are fastened on the clamping blocks in the axial direction and the radial direction through bolts, and the displacement constraint of the vortex breaker in actual work is simulated.
Referring to fig. 4, an exciting force applying and measuring device according to an embodiment of the present invention is shown. The vibration exciter 3 is connected with the air-entraining pipe to-be-measured piece 10 through a vibration exciting rod 4 with a variable cross section, the vibration exciting rod 4 is divided into two sections, and the middle is connected through a dynamic force sensor 5 and used for measuring the vibration exciting force in real time. The exciting force is applied by the exciting rod 4 (variable-section flexible threaded connecting rod), so that tangential load generated by the exciter is fully consumed by the thin rod part under the self flexibility, and the influence of additional constraint on the vortex reducer is eliminated.
Referring to fig. 5, a schematic diagram of a vibration response measuring apparatus of a vortex breaker according to an embodiment of the invention is shown. The sensor support frame 17 is fixed on the base of the rack 9, the eddy current displacement sensor and the acceleration sensor are respectively arranged on a bracket 18 extending out of the support frame, and the positions of the bracket 18 and the mounting nut 19 are adjusted, so that a proper measuring gap is kept between the head of the sensor 12 and the surface of a measured point on the air-entraining pipe to-be-measured piece 10.
Referring to fig. 6, a method for testing non-rotational vibration response of a tubular vortex breaker according to an embodiment of the present invention includes the following steps:
and 8, replacing the air entraining pipe to-be-tested model with the damping pipe, wherein the fit clearance between the air entraining pipe and the damping pipe is controlled in the installation process so as to avoid interference. Repeating the steps 2 to 6, and exploring the vibration reduction effect of the damping tube in the vibration process of the vortex reducer;
and 9, replacing damping tube models with different lengths, slotting numbers and slotting depths, and repeating the steps 2 to 6 to obtain change curves of vibration and response characteristics of the air entraining tube under different damping tube structural parameters.
In the method, the air-guiding pipe and the air-guiding disk are connected to the clamping blocks through bolts, so that the disassembly and the replacement are convenient, and the change curves and the influence rules of the structural parameters of different air-guiding pipes and damping pipes on vibration and response characteristics can be explored by replacing the air-guiding pipe to-be-detected piece; the jacking block and the pressing block are combined together to be fixing devices for maintaining and supporting basic load applied by experiments, and the design of the clamping block can be adapted according to the form of a piece to be tested of the air-entraining pipe, so that the vibration response characteristics of various vortex reducers and damping blades can be measured.
In summary, the embodiment of the invention discloses a system and a method for testing vibration response characteristics of a tubular vortex breaker, wherein the testing system mainly comprises a foundation fixing device of the vortex breaker, a top force load applying and measuring device, an exciting force applying and measuring device, a vibration response measuring device of the vortex breaker and the like. The damping response curve of the free vibration of the vortex breaker is obtained by measuring by a force hammer knocking method, and the natural vibration frequency of the vortex breaker can be obtained by spectrum analysis; the test system can realize the measurement of the vibration and response characteristics of various tubular vortex reducers, and has important significance for deeply knowing the action mechanism of the tubular vortex reducers, inhibiting the vibration of the vortex reducers and exploring the law of the coupling vibration of the tubular vortex reducers and air entraining discs.
The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, one skilled in the art may make modifications and equivalents to the specific embodiments of the present invention, and any modifications and equivalents not departing from the spirit and scope of the present invention are within the scope of the claims of the present invention.
Claims (10)
1. A tubular vortex breaker vibration response characteristic testing system, comprising:
an input section for inputting an excitation signal;
the test part is used for testing the non-rotary vibration response characteristic of the tubular vortex reducer according to the excitation signal to obtain test result data; the tubular vortex reducer comprises a gas-guiding pipe to-be-tested piece (10) and a gas-guiding disc (11);
the test section includes:
vortex breaker foundation fixing device includes: the device comprises a clamping block (6), an air entraining disc (11) and a pressing block (20); the pressing block (20) is fixedly connected with the vibration isolation foundation platform, the clamping block (6) is detachably and fixedly arranged on the pressing block (20), and the clamping block (6) is used for installing a gas guiding pipe to-be-detected piece (10) and a gas guiding disc (11);
the top force load applying and measuring device is used for applying a top force to the air entraining pipe to-be-measured piece (10) and the air entraining disc (11) and measuring the applied load value;
the exciting force applying and measuring device is used for applying exciting force to the air entraining pipe to-be-measured piece (10) and the air entraining disc (11) and measuring the applied load value;
the vortex reducer vibration response measuring device comprises an eddy current displacement sensor and an acceleration sensor and is used for realizing vibration response measurement of an air guide pipe to-be-measured piece (10);
and the output part is used for outputting the test result data.
2. The vibration response testing system of a tube type vortex breaker according to claim 1, wherein the input section comprises:
a function signal generator (1) for generating a sinusoidal steady-state signal;
the power amplifier (2) is used for amplifying the sinusoidal steady-state signal to obtain an amplified signal; the amplified signal is used as an excitation signal for the test section.
3. A tubular vortex breaker vibration response performance testing system in accordance with claim 1 wherein said top force load applying and measuring means comprises: an oil pump (16), an oil pressure gauge (15), a jack (8) and a jacking block (7); the oil pump (16) is communicated with an oil inlet of the jack (8) through the oil pressure gauge (15), and the jacking block (7) is fixedly arranged at the jacking force output end of the jack (8).
4. The vibration response characteristic test system of a tube type vortex breaker according to claim 1, wherein the exciting force applying and measuring means comprises: the vibration exciter (3), the vibration exciting rod (4) and the dynamic force sensor (5);
the input end of the vibration exciter (3) is used for receiving the excitation signal, the output end of the vibration exciter (3) is fixedly connected with one end of the vibration exciting rod (4), and the other end of the vibration exciting rod (4) is used for being connected with a piece (10) to be detected of the air entraining pipe;
the dynamic force sensor (5) is arranged on the excitation rod (4).
5. The vibration response characteristic testing system of the tubular vortex breaker according to claim 4, wherein the excitation rod (4) is a flexible threaded connecting rod with a variable cross section and a narrow middle and wide two ends.
6. The vibration response testing system of a tube type vortex breaker according to claim 1, wherein the output section comprises:
the data acquisition device (13) is used for acquiring data acquired by the eddy current displacement sensor and the acceleration sensor;
and the computer (14) is used for storing and displaying the data acquired by the data acquisition unit (13).
7. A method for testing vibration response characteristics of a tubular vortex breaker, based on the system of claim 1, comprising the steps of:
the method comprises the steps of installing an air entraining pipe to-be-detected piece and an air entraining disc on a clamping block through bolts, applying a top force load through a top force load applying and measuring device, monitoring a load value, and obtaining the top force load used in the test process;
the exciting force applying and measuring device is connected with the blade of the air entraining pipe to-be-measured piece, and a simple harmonic steady-state vibration signal is transmitted to the air entraining pipe to-be-measured piece, so that exciting force loading is realized; wherein, the amplitude of the exciting force is stabilized on a preset value by monitoring the load value of the exciting force;
measuring and obtaining vibration displacement responses of different positions of the length of the air-entraining pipe in the air-entraining pipe to be measured by adopting a sensor; changing the excitation frequency to obtain an amplitude-frequency response curve of the induced air pipe at each measuring point; changing the amplitude of exciting force to obtain a vibration frequency response curve under the load action of the exciting force with different amplitude; and replacing the air-entraining pipe to-be-tested pieces with different lengths, diameters and fit clearances to obtain the change curves of the vibration and response characteristics of the air-entraining pipe under different structural parameters.
8. The method for testing the vibration response characteristics of the tubular vortex breaker according to claim 7, wherein when a top force load used in the testing process is obtained, a force hammer knocking method is adopted to measure and obtain a damping response curve of free vibration of a gas-introducing pipe to be tested of the vortex breaker, and the natural frequency of the vortex breaker is obtained through frequency spectrum analysis;
natural frequency f of air-entraining pipe to be tested of nth loading vortex reducer n Natural frequency f from n-1 th time n-1 When the relative error is smaller than a preset value, the load corresponding to the nth loading is used as the top force load used in the experimental test process.
9. The method of claim 7, wherein the bleed-pipe test piece comprises a bleed-pipe test piece with a damper pipe and a bleed-pipe test piece without a damper pipe.
10. The method for testing vibration response characteristics of a tubular vortex breaker according to claim 9, wherein when using a bleed pipe test piece with a damper pipe, further comprising: and replacing damping tube models with different lengths, grooving numbers and grooving depths to obtain change curves of the vibration and response characteristics of the air entraining tube under different damping tube structural parameters.
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