CN113176083A - System and method for testing vibration response characteristic of tubular vortex reducer - Google Patents
System and method for testing vibration response characteristic of tubular vortex reducer Download PDFInfo
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- CN113176083A CN113176083A CN202110419602.0A CN202110419602A CN113176083A CN 113176083 A CN113176083 A CN 113176083A CN 202110419602 A CN202110419602 A CN 202110419602A CN 113176083 A CN113176083 A CN 113176083A
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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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- 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
- G01M7/025—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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
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Abstract
The invention discloses a system and a method for testing vibration response characteristics of a tubular vortex reducer, wherein the system for testing vibration response characteristics of the tubular vortex reducer comprises the following steps: an input section for inputting an excitation signal; the test part is used for carrying out non-rotation vibration response characteristic test on 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 method 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 guide disc.
Description
Technical Field
The invention belongs to the technical field of vibration characteristic measurement, and particularly relates to a system and a method for testing vibration response characteristics of a tubular vortex reducer.
Background
In aircraft engine secondary air systems, bleed air flow paths are designed to absorb heat from the high thermal load turbine disks, prevent hot gases from being drawn into the cavities between the turbine disks from the main turbine gas passages, and seal the bearing chamber from oil and gas leakage.
The currently adopted internal air entraining mode is to guide air from the bore of the drum of the high-pressure compressor to the high-pressure shaft in an inward direction, and the air entraining mode can avoid increasing external pipelines and improve the air entraining safety. However, the air flow obtained in this way is subjected to rotational influences, which can form strong vortices in the disk chamber, resulting in a large flow pressure loss. To solve the problem of large energy loss of air flowing in the rotating disk cavity, various vortex reducer structures are usually installed in the rotating disk cavity to limit the air rotation and guide the air to flow radially inwards. Wherein, the tubular vortex reducer is a structure that a set of radial vortex reducing pipes are arranged in a disc cavity of the compressor, and can effectively prevent air flow from generating larger circumferential speed, thereby inhibiting the generation of vortex and effectively reducing the pressure loss in the disc. However, due to the "pipe organ effect", the pipe is prone to vibration under the excitation of the gas stream, which can lead to cracking due to high cycle fatigue.
At present, research on a vortex reducer focuses on flow characteristic analysis for reducing free vortices and pressure drop loss, but relatively few researches on the vibration characteristic and structural damping optimization of the vortex reducer are made, and the experimental research on the vibration characteristic of the vortex reducer is more rarely reported. As a key hot end component in an aeroengine, when a tubular vortex reducer works in a disc cavity of an air compressor, a complex nonlinear fluid-solid coupling effect and an airflow exciting force effect are involved, influence factors are more, a vibration mechanism is complex, a non-negligible vibration problem is generated under the combined action of vortex and a rotor in the disc cavity, and the vibration safety of a turbine disc is threatened, so that experimental research on the vibration response characteristic analysis of the vortex reducer is necessary.
In summary, a new system and method for testing the vibration response characteristics of the tubular vortex reducer are needed.
Disclosure of Invention
The invention aims to provide a vibration response characteristic testing system and method for a tubular vortex reducer, so as to solve one or more technical problems. The method 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 guide disc.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention discloses a vibration response characteristic test system of a tubular vortex reducer, which comprises:
an input section for inputting an excitation signal;
the test part is used for carrying out non-rotation vibration response characteristic test on the tubular vortex reducer according to the excitation signal to obtain test result data; the tubular vortex reducer comprises a to-be-detected part of the air guide pipe and an air guide disc; the test section includes:
vortex reducer basis fixing device includes: the device comprises a clamping block, an air guide disc and a pressing block; the pressing block is used for being fixedly connected with the vibration isolation base platform, the clamping block is detachably and fixedly arranged on the pressing block, and the clamping block is used for installing a to-be-tested part of the air guide pipe and the air guide disc;
the jacking force load applying and measuring device is used for applying jacking force to the to-be-measured part of the air guide pipe and the air guide disc and measuring an applied load value;
the exciting force applying and measuring device is used for applying exciting force to the to-be-measured part of the air guide pipe and the air guide disc and measuring an 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 to-be-measured part of the air guide pipe;
and the output part is used for outputting the test result data.
In a further development of the invention, the input comprises:
a function signal generator for generating a sinusoidal steady-state signal;
the power amplifier is used for amplifying the sine steady-state signal to obtain an amplified signal; the amplified signal is used as an excitation signal of the test section.
A further improvement of the present invention resides in that the jacking force load applying and measuring device includes: the oil pump, the oil pressure gauge, the jack and the jacking block; the oil pump is communicated with an oil inlet of the jack through the oil pressure gauge, and the jacking block is fixedly installed at a jacking force output end of the jack.
A further improvement of the present invention resides in that the exciting force applying and measuring device includes: the device comprises a vibration exciter, a vibration exciting rod and a 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 the part to be tested of the air guide pipe; the dynamic force sensor is arranged on the excitation rod.
The invention is further improved in that the excitation rod is a flexible threaded connecting rod with a variable cross section, the middle of the flexible threaded connecting rod is narrow, and the two ends of the flexible threaded connecting rod are wide.
In a further improvement of the present invention, the output unit includes: the data acquisition unit 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 unit.
The invention discloses a method for testing vibration response characteristics of a tubular vortex reducer, which is based on the system provided by the invention and comprises the following steps of:
installing a to-be-tested part of the air entraining pipe and an air entraining disc on the clamping block through bolts, applying a jacking load through a jacking load applying and measuring device, monitoring a load value, and acquiring a jacking load used in a testing process;
connecting an exciting force applying and measuring device with a blade of a to-be-tested part of the bleed air pipe, and transmitting a simple-resonance stable-state vibration signal to the to-be-tested part of the bleed air 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 by using a sensor to obtain vibration displacement responses at different positions of the length of the bleed air pipe; changing the excitation frequency to obtain an amplitude-frequency response curve of the bleed pipe at each measuring point; changing the amplitude of the exciting force to obtain a vibration frequency response curve under the action of exciting force loads with different amplitudes; and replacing the parts to be tested of the bleed air pipe with different lengths, diameters and fit gaps to obtain the change curves of the vibration and response characteristics of the bleed air pipe under different structural parameters.
The method is further improved in that when the jacking force load used in the test process is obtained, a force hammer percussion method is adopted to measure and obtain an attenuation response curve of the free vibration of the air guide pipe to-be-tested piece, and the natural frequency of the vortex reducer is obtained through frequency spectrum analysis;
natural frequency f of part to be tested of nth-time loading air guide pipenNatural frequency f of order n-1n-1And when the relative error between the load and the load is smaller than a preset value, taking the load corresponding to the nth loading as the jacking load used in the experimental test process.
The invention is further improved in that the bleed air pipe to-be-tested piece comprises a bleed air pipe to-be-tested piece with a damping pipe and a bleed air pipe to-be-tested piece without the damping pipe.
The invention has the further improvement that when the air guide pipe to-be-tested piece with the damping pipe is adopted, the invention also comprises the following steps: and replacing the damping tube models with different lengths, grooving numbers and grooving depths to obtain the change curves of the vibration and response characteristics of the bleed air tube under different damping tube structure parameters.
Compared with the prior art, the invention has the following beneficial effects:
the method 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 guide disc.
According to the invention, the air guide pipe and the air guide disc are connected to the clamping block in a detachable mode (can be bolts), so that the air guide pipe and the air guide disc are convenient to detach and replace, and the change curves and the influence rules of different structural parameters of the air guide pipe and the damping pipe on the vibration and response characteristics can be explored by replacing the model of the to-be-tested part of the air guide pipe.
In the invention, the vortex reducer under the non-rotating condition is subjected to equivalent centrifugal force action under the rotating condition by applying the jacking force load, and the axial displacement constraint and the radial displacement constraint which are actually received are equivalent by fastening the bolts on the clamping blocks, so that the cost of an experimental section and the experimental safety concern are greatly reduced, and the jacking force load can be monitored by an oil pump and an oil pressure gauge, thereby facilitating the manual fine control and the active operation.
In 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 variable cross-section flexible exciting rod is adopted to apply excitation, so that the influence of additional constraint on the vibration characteristic of the vortex reducer is eliminated, and the measurement precision is improved.
The test method has high repeatability and wide applicability, the clamp blocks are designed to be detachable and can be adapted according to the form of the piece to be tested, and various key parts concerning the vibration characteristics in the turbine machinery can be measured, such as various vortex reducers, damping blades, gilding 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 drawings used in the description of the embodiments or the prior art are briefly introduced below; it is obvious that the drawings in the following description are some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic block diagram of a non-rotational vibration response characteristic experimental test system of a tubular vortex reducer according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a non-rotational vibration response characteristic experimental test system of a tubular vortex reducer according to an embodiment of the invention;
FIG. 3 is a schematic illustration of a vortex reducer attachment apparatus and a top force load application and measurement apparatus in accordance with an embodiment of the present invention;
FIG. 4 is a schematic view of an excitation force application and measurement device in an embodiment of the present invention;
FIG. 5 is a schematic view of a vortex breaker vibration response measurement device in an embodiment of the present invention;
FIG. 6 is a schematic flow chart of an experimental test method for non-rotational vibration response characteristics of a tubular vortex reducer according to an embodiment of the invention; fig. 6 (a) is a schematic flow chart of a bleed air pipe model in which the to-be-measured object is an undamped pipe, and fig. 6 (b) is a schematic flow chart of a bleed air pipe model with a damped pipe;
in fig. 1 to 6, 1-function signal generator; 2-a power amplifier; 3-a vibration exciter; 4-exciting a vibration rod; 5-a dynamic force sensor; 6-clamping a block; 7-a top block; 8-a jack; 9-a gantry; 10-a to-be-detected part of the air guide pipe; 11-a gas guiding disc; 12-a sensor; 13-a data collector; 14-a computer; 15-oil pressure gauge; 16-an oil pump; 17-a sensor support; 18-a bracket; 19-mounting a nut; and 20-briquetting.
Detailed Description
In order to make the purpose, technical effect and technical solution of the embodiments of the present invention clearer, the following clearly and completely describes the technical solution of the embodiments of the present invention with reference to the drawings in the embodiments of the present invention; it is to be understood that the described embodiments are only some of the embodiments of the present invention. Other embodiments, which can be derived by one of ordinary skill in the art from the disclosed embodiments without inventive faculty, are intended to be within the scope of the invention.
Referring to fig. 1 and 2, a non-rotational vibration response characteristic testing system for a tubular vortex reducer according to an embodiment of the present invention mainly includes 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 signal is amplified by the power amplifier 2 and then is used as an input excitation signal of the system;
the test part mainly comprises a vortex reducer base 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 reducer foundation fixing device includes: the test device comprises a rack 9, a clamping block 6, an air guide disc 11 and an air guide pipe to-be-tested piece 10 (including an air guide pipe to-be-tested piece without a damping pipe and an air guide pipe to-be-tested piece with a damping pipe). The two side racks 9 are arranged on the 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 the two ends. The air guide pipe to-be-detected piece 10 and the air guide disc 11 are fastened on the clamping blocks through bolts in the axial direction and the radial direction, and displacement constraint in actual work is simulated.
The jacking force load applying and measuring device includes: the oil pump 16, the oil pressure gauge 15, the jack 8, the top block 7 and the pressing block 20.
The exciting force applying and measuring device includes: the vibration exciter 3, the variable cross section exciting rod 4 and the dynamic force sensor 5.
The vortex reducer vibration response measuring device comprises a sensor support 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. Fixing a sensor support frame 17 on the base of the table frame 9, respectively installing an eddy current displacement sensor and an acceleration sensor on a bracket 18 extending out of the sensor support frame 17, and adjusting the positions of the bracket 18 and an installation nut 19 to ensure that a proper measurement gap is kept between the head of the sensor 12 and the surface of a measured point of the bleed air 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 force hammer percussion method is adopted to measure and obtain an attenuation response curve of free vibration of the vortex reducer, and the natural frequency of the vortex reducer is obtained through frequency spectrum analysis; the air guide pipe and the air guide disc are fastened on the clamping block through bolts in the axial direction and the radial direction, and displacement constraint of the vortex reducer in actual work is simulated; loading a part to be tested of the air guide pipe to a completely fastened state by measuring the natural frequency, and taking a load corresponding to the completely fastened state as a jacking load used in an experimental test process; the variable cross-section flexible threaded connecting rod with a narrow middle part and wide two sides is adopted for applying the exciting force, so that the thin rod part fully consumes the tangential load generated by the vibration exciter under the self flexibility, and the influence of additional constraint on the vortex reducer is eliminated; the design of the clamping block is adopted, so that the model of the vortex reducer to be tested in the experiment can be conveniently replaced; the method comprises the following steps that (1) an experiment is carried out on two to-be-tested parts of the air guide pipe without a damping pipe and the air guide pipe with a damping pipe, and the damping effect of the damping pipe in the vibration process can be contrastingly researched; the model of the bleed air pipe to be tested with different lengths, different diameters and different fit clearances is replaced, so that the change curves and the influence rules of different bleed air pipe structure parameters on the vibration and response characteristics can be explored; by replacing the clamping block matched with the to-be-tested piece of the bleed air pipe, the test system can realize measurement of vibration response characteristics of various vortex reducers and damping blades.
Referring to fig. 3, in the vortex reducer fixing device, the jacking load applying and measuring device according to the embodiment of the present invention, the jack 8 is placed on the base of the platform 9, the top block 7 is installed, and the top block is connected to the pressing block 20 through the side bolt. The pressing block 20 is fixed on the rack 9, and the bolt at 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 disc are fastened on the clamping block through bolts in the axial direction and the radial direction, and displacement constraint of the vortex reducer in actual work is simulated.
Referring to fig. 4, an excitation force applying and measuring apparatus according to an embodiment of the present invention is shown. The vibration exciter 3 is connected with the part to be tested 10 of the bleed air pipe through the vibration exciting rod 4 with the variable cross section, the vibration exciting rod 4 is divided into two sections, and the middle of the vibration exciting rod is connected through the dynamic force sensor 5 and used for measuring the size of the exciting force in real time. An excitation rod 4 (a variable cross-section flexible threaded connecting rod) is adopted to apply excitation force, so that the thin rod part fully consumes tangential load generated by the vibration exciter under self flexibility, and the influence of additional constraint on the vortex reducer is eliminated.
Referring to fig. 5, a schematic diagram of a vortex reducer vibration response measuring device according to an embodiment of the invention is shown. A sensor support frame 17 is fixed on the base of the table frame 9, an eddy current displacement sensor and an acceleration sensor are respectively arranged on a bracket 18 extending out of the support frame, and the positions of the bracket 18 and a mounting nut 19 are adjusted, so that a proper measuring gap is kept between the head part of the sensor 12 and the surface of a measured point on the air guide pipe to-be-measured piece 10.
Referring to fig. 6, a non-rotational vibration response testing method for a tubular vortex reducer according to an embodiment of the present invention includes the following steps:
and 8, replacing the model to be tested of the bleed air pipe with the damping pipe, and controlling the fit clearance of the bleed air pipe and the damping pipe in the installation process so as to avoid interference. Repeating the steps 2 to 6, and researching the vibration reduction effect of the damping pipe in the vibration process of the vortex reducer;
and 9, replacing damping tube models with different lengths, grooving numbers and grooving depths, and repeating the steps 2 to 6 to obtain the change curves of the vibration and response characteristics of the bleed air tube under different damping tube structure parameters.
According to the method, the air guide pipe and the air guide disc are connected to the clamping block through the bolts, so that the air guide pipe and the air guide disc are convenient to disassemble and replace, and the change curves and the influence rules of different structural parameters of the air guide pipe and the damping pipe on vibration and response characteristics can be explored by replacing the to-be-tested part of the air guide pipe; the top block and the pressing block are combined fixing devices and are used for keeping and supporting basic loads applied in experiments, and the design of the clamping block can be adapted according to the form of a to-be-detected part of the air entraining pipe, so that the measurement of vibration response characteristics of various vortex reducers and damping blades is realized.
To sum up, the embodiment of the invention discloses a system and a method for testing vibration response characteristics of a tubular vortex reducer. Measuring by adopting a force hammer percussion method to obtain an attenuation response curve of free vibration of the vortex reducer, and obtaining the natural vibration frequency of the vortex reducer through frequency spectrum analysis; the test system can measure the vibration and response characteristics of various tubular vortex reducers by replacing clamping blocks matched with the bleed pipe to be tested, and has important significance for deeply knowing the action mechanism of the tubular vortex reducers, inhibiting the vibration of the vortex reducers and researching the rule of the coupling vibration of the tubular vortex reducers and the bleed discs.
Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the embodiments of the present invention without departing from the spirit and scope of the present invention, which is set forth in the claims of the present application.
Claims (10)
1. A tubular deswirler vibration response characteristic testing system, comprising:
an input section for inputting an excitation signal;
the test part is used for carrying out non-rotation vibration response characteristic test on the tubular vortex reducer according to the excitation signal to obtain test result data; the tubular vortex reducer comprises a to-be-detected air guide pipe (10) and an air guide disc (11);
the test section includes:
vortex reducer basis fixing device includes: 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 the to-be-tested part (10) of the air entraining pipe and the air entraining disc (11);
the jacking force load applying and measuring device is used for applying jacking force to the to-be-measured air guide pipe (10) and the air guide disc (11) and measuring an applied load value;
the exciting force applying and measuring device is used for applying exciting force to the to-be-measured part (10) of the air guide pipe and the air guide disc (11) and measuring an 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 to-be-measured part (10) of the bleed air pipe;
and the output part is used for outputting the test result data.
2. The tubular vortex reducer vibration response characteristic testing system of claim 1, wherein the input portion comprises:
a functional signal generator (1) for generating a sinusoidal steady-state signal;
the power amplifier (2) is used for amplifying the sine steady-state signal to obtain an amplified signal; the amplified signal is used as an excitation signal of the test section.
3. The tubular vortex reducer vibration response characteristic testing system of claim 1, wherein the jacking load applying and measuring device comprises: an oil pump (16), an oil pressure gauge (15), a jack (8) and a top 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 installed at a jacking force output end of the jack (8).
4. The tubular vortex reducer vibration response characteristic testing system of claim 1, wherein the excitation force applying and measuring device comprises: the vibration exciter comprises a vibration exciter (3), a vibration exciting rod (4) and a 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 to-be-tested part (10) of the air guide pipe;
the dynamic force sensor (5) is arranged on the excitation rod (4).
5. The tubular vortex reducer vibration response characteristic testing system according to claim 4, wherein the exciting rod (4) is a flexible threaded connecting rod with a narrow middle part and wide two ends and a variable cross section.
6. The tubular vortex reducer vibration response characteristic testing system of claim 1, wherein the output portion comprises:
the data acquisition unit (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 the vibration response characteristic of a tubular vortex reducer is characterized in that the method is based on the system of claim 1 and comprises the following steps:
installing a to-be-tested part of the air entraining pipe and an air entraining disc on the clamping block through bolts, applying a jacking load through a jacking load applying and measuring device, monitoring a load value, and acquiring a jacking load used in a testing process;
connecting an exciting force applying and measuring device with a blade of a to-be-detected part of the bleed air pipe, and transmitting a simple-resonance stable-state vibration signal to the to-be-detected part of the bleed air 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 by using a sensor to obtain vibration displacement responses of different positions of the length of the bleed air pipe in the bleed air pipe to-be-measured piece; changing the excitation frequency to obtain an amplitude-frequency response curve of the bleed pipe at each measuring point; changing the amplitude of the exciting force to obtain a vibration frequency response curve under the action of exciting force loads with different amplitudes; and replacing the parts to be tested of the bleed air pipe with different lengths, diameters and fit gaps to obtain the change curves of the vibration and response characteristics of the bleed air pipe under different structural parameters.
8. The method for testing the vibration response characteristic of the tubular vortex reducer according to claim 7, wherein when a jacking force load used in a testing process is obtained, a force hammer tapping method is adopted to measure and obtain an attenuation response curve of free vibration of a to-be-tested piece of the air entraining pipe of the vortex reducer, and the natural frequency of the vortex reducer is obtained through frequency spectrum analysis;
inherent frequency f of part to be tested of nth-loading vortex reducer air guide pipenNatural frequency f of order n-1n-1And when the relative error between the load and the load is smaller than a preset value, taking the load corresponding to the nth loading as the jacking load used in the experimental test process.
9. The method for testing the vibration response characteristic of the tubular vortex reducer according to claim 7, wherein the bleed air pipe to-be-tested piece comprises a bleed air pipe to-be-tested piece with the damping pipe and a bleed air pipe to-be-tested piece without the damping pipe.
10. The method for testing the vibration response characteristic of the tubular vortex reducer according to claim 9, wherein when the bleed air pipe to-be-tested piece with the damping pipe is adopted, the method further comprises the following steps: and replacing the damping tube models with different lengths, grooving numbers and grooving depths to obtain the change curves of the vibration and response characteristics of the bleed air tube under different damping tube structure parameters.
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