CN113176083B - Vibration response characteristic test system and method for tubular vortex reducer - Google Patents

Abstract

The invention discloses a system and method for testing the vibration response characteristics of a tubular vortex reducer. The system for testing the vibration response characteristics of a tubular vortex reducer includes: an input part for inputting an excitation signal; The excitation signal is used to test the non-rotational vibration response characteristics of the tubular vortex reducer to obtain test result data; the output unit is used to output the test result data. The invention can realize the measurement of the vibration and response characteristics of the tubular vortex reducer, which is useful for in-depth understanding of the action mechanism of the tubular vortex reducer, suppressing the vibration of the vortex reducer, and exploring the law of coupling vibration between the tubular vortex reducer and the air-inducing plate is of great significance.

Description

A test system and method for vibration response characteristics of a tubular vortex reducer

technical field

The invention belongs to the technical field of vibration characteristic measurement, and in particular relates to a vibration response characteristic testing system and method of a tubular vortex reducer.

Background technique

In the secondary air system of an aero-engine, the bleed flow path is designed to absorb the heat of the high heat load turbine disk, prevent hot gas from being sucked into the cavity between the turbine disks from the main turbine gas passage, and seal the bearing chamber to avoid oil and gas leakage.

The current internal bleed air method is to drain the gas radially inward from the high-pressure compressor drum hole to the high-pressure shaft. This bleed air method can avoid adding external pipelines and improve the safety of bleed air. However, the airflow obtained in the above manner will form a strong vortex in the disk cavity due to the influence of the rotation, resulting in a large flow pressure loss. In order to solve the problem of large energy loss when the air flows in the rotating disc cavity, various vortex reducer structures are usually installed in the rotating disc cavity to limit the air rotation and guide its radial inward flow. Among them, the tubular vortex reducer is a structure in which a set of radial vortex reducers are installed in the compressor disk cavity, which can effectively prevent the air flow from generating a large circumferential velocity, thereby inhibiting the generation of vortex and effectively reducing the pressure inside the disk. loss. However, due to the "organ effect", the tubes tend to vibrate when excited by the air flow, which can lead to cracking due to high cycle fatigue.

At present, the research on the vortex reducer focuses on the analysis of the flow characteristics of reducing the free vortex and reducing the pressure drop loss, but there are relatively few studies on the vibration characteristics and structural damping optimization of the vortex reducer, and the experimental research on the vibration characteristics of the vortex reducer is limited. It is rarely reported. As a key hot-end component in an aero-engine, the tubular vortex reducer involves complex nonlinear fluid-solid coupling and airflow excitation when it works in the compressor disk cavity. There are many influencing factors and the vibration mechanism is complex. The combination of eddy current in the disk cavity and the rotor will produce non-negligible vibration problems, which will pose a threat to the vibration safety of the turbine disk. Therefore, it is necessary to carry out experimental research on the vibration response characteristics of the vortex reducer.

In summary, there is an urgent need for a new testing system and method for the vibration response characteristics of a tubular vortex reducer.

Contents of the invention

The object of the present invention is to provide a testing system and method for the vibration response characteristics of a tubular vortex reducer, so as to solve one or more of the above-mentioned existing technical problems. The invention can realize the measurement of the vibration and response characteristics of the tubular vortex reducer, which is useful for in-depth understanding of the action mechanism of the tubular vortex reducer, suppressing the vibration of the vortex reducer, and exploring the law of coupling vibration between the tubular vortex reducer and the air-inducing plate is of great significance.

To achieve the above object, the present invention adopts the following technical solutions:

A test system for vibration response characteristics of a tubular vortex reducer according to the present invention, comprising:

an input unit for inputting an excitation signal;

The test section is used to test the non-rotational vibration response characteristics of the tubular vortex reducer according to the excitation signal, and obtain test result data; the tubular vortex reducer includes an air induction pipe to be tested and an air induction plate; the test Sections include:

The base fixing device of the vortex reducer includes: a clamp block, an air induction plate and a pressure block; the pressure block is used for fixed connection with the vibration isolation foundation platform, and the clamp block is detachably and fixedly installed on the pressure block. The clamping block is used to install the bleed pipe to be tested and the bleed plate;

Jacking force load applying and measuring device, used to apply jacking force to the bleed tube to be tested and the bleed plate, and measure the applied load value;

The exciting force applying and measuring device is used to apply the exciting force to the bleed tube to be tested and the bleed plate, and measure the applied load value;

The vibration response measurement device of the vortex reducer, including the eddy current displacement sensor and the acceleration sensor, is used to realize the vibration response measurement of the bleed air pipe DUT;

an output unit for outputting the test result data.

A further improvement of the present invention is that the input unit includes:

A function signal generator for generating sinusoidal steady-state signals;

The power amplifier is used to amplify the sinusoidal steady-state signal to obtain an amplified signal; the amplified signal is used as an excitation signal of the testing unit.

A further improvement of the present invention is that the jack force load applying and measuring device includes: an oil pump, an oil pressure gauge, a jack and a jacking block; the oil pump communicates with the oil inlet of the jack through the oil pressure gauge, and the The jacking block is fixedly installed at the jacking force output end of the jack.

A further improvement of the present invention is that the device for applying and measuring the excitation force includes: a vibration exciter, an excitation rod and a dynamic force sensor; the input end of the vibration exciter is used to receive the excitation signal, and the excitation The output end of the device is fixedly connected with one end of the exciting rod, and the other end of the exciting rod is used to connect with the air-inducing tube to be tested; the dynamic force sensor is arranged on the exciting rod.

A further improvement of the present invention is that the exciting rod is a flexible threaded connecting rod with variable cross-section, narrow in the middle and wide at both ends.

A further improvement of the present invention is that the output unit includes: a data collector for acquiring the data collected by the eddy current displacement sensor and the acceleration sensor; a computer for storing and displaying the data obtained by the data collector.

A method for testing the vibration response characteristics of a tubular vortex reducer of the present invention, based on the above-mentioned system of the present invention, includes the following steps:

Install the bleed pipe to be tested and the bleed disc on the clamp block through bolts, apply the jack load through the jack load application and measuring device and monitor the load value to obtain the jack load used in the test process;

Connect the excitation force applying and measuring device to the blade of the air-inducing pipe to be tested, and transmit the simple harmonic steady-state vibration signal to the air-inducing pipe to be tested, so as to realize the loading of the exciting force; wherein, by monitoring the excitation force Load value, so that the amplitude of the exciting force is stabilized at the predetermined value;

Use sensors to measure the vibration displacement response at different positions of the bleed air pipe length; change the excitation frequency to obtain the amplitude-frequency response curve of the bleed air pipe at each measuring point; change the amplitude of the excitation force to obtain the load effect of the excitation force with different amplitudes The vibration frequency response curve below; change the air-induction tube to be tested with different lengths, diameters and matching clearances, and obtain the variation curves of the air-induction tube vibration and response characteristics under different structural parameters.

A further improvement of the present invention is that, when obtaining the jacking force load used in the test process, the attenuation response curve of the free vibration of the bleed pipe to be tested is measured by using the hammer knocking method, and the natural frequency of the vortex reducer is obtained through frequency spectrum analysis;

When the relative error between the natural frequency f _n of the n-th loading of the bleed pipe to be tested and the n-1 natural frequency f _n-1 is less than the preset value, the n-th loading of the corresponding load is taken as the experimental test process The top force load used in .

A further improvement of the present invention is that the air-inducing tube to be tested includes an air-inducing tube to be tested with a damping tube and an air-inducing tube to be tested without a damping tube.

The further improvement of the present invention is that, when adopting the bleed pipe to be tested with the damping tube, it also includes: replacing the damping tube model with different lengths, slot numbers and slot depths, and obtaining the vibration and vibration of the bleed tube under different damping tube structural parameters. Variation curve of the response characteristic.

Compared with the prior art, the present invention has the following beneficial effects:

The invention can realize the measurement of the vibration and response characteristics of the tubular vortex reducer, which is useful for in-depth understanding of the action mechanism of the tubular vortex reducer, suppressing the vibration of the vortex reducer, and exploring the law of coupling vibration between the tubular vortex reducer and the air-inducing plate is of great significance.

In the present invention, the air-inducing tube and the air-inducing disc are connected to the clamp block in a detachable manner (may be a bolt), which is convenient for disassembly and replacement. Variation curves and influence laws of vibration and response characteristics.

In the present invention, the method of applying jacking load to the vortex reducer under the non-rotating condition is used to equivalent the centrifugal force under the rotating condition, and the method of fastening the bolts on the clamping block is used to equivalent the actual axial and radial force. The upward displacement constraint greatly reduces the cost of the experimental section and the safety concerns of the experiment, and the jacking load can be adjusted by the oil pump and monitored by the oil pressure gauge, which is convenient for manual fine control and active operation.

In the present invention, the fastening state between the vortex reducer and the clamping block is obtained by using the force hammer knocking method, the operation is simple and easy to implement, and the flexible excitation rod with variable cross-section is used to apply excitation to eliminate the influence of additional constraints on the vibration characteristics of the vortex reducer , improving the measurement accuracy.

The test method of the present invention has high repeatability and wide applicability. The clamping block is designed to be detachable and can be adapted according to the form of the test piece, which can realize the measurement of various key components concerned with vibration characteristics in turbomachinery, such as various Vortex reducer, damping blade, Larkin blade, etc.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art; obviously, the accompanying drawings in the following description are For some embodiments of the present invention, those skilled in the art can also obtain other drawings based on these drawings without creative effort.

Fig. 1 is a schematic block diagram of an experimental testing system for non-rotating vibration response characteristics of a tubular vortex reducer according to an embodiment of the present invention;

2 is a schematic diagram of an experimental testing system for non-rotating vibration response characteristics of a tubular vortex reducer according to an embodiment of the present invention;

Fig. 3 is a schematic diagram of a vortex reducer fixing device and a jacking load application and measurement device in an embodiment of the present invention;

Fig. 4 is a schematic diagram of an excitation force application and measurement device in an embodiment of the present invention;

Fig. 5 is a schematic diagram of a vibration response measuring device of a vortex reducer in an embodiment of the present invention;

Fig. 6 is a schematic flow chart of an experimental testing method for non-rotating vibration response characteristics of a tubular vortex reducer according to an embodiment of the present invention; wherein, (a) in Fig. 6 is a schematic flow chart of an bleed pipe model in which the test piece is an undamped tube, Among Fig. 6 (b) the schematic flow chart of the sample to be tested is the bleed pipe model with damping pipe;

In Fig. 1 to Fig. 6, 1-function signal generator; 2-power amplifier; 3-vibrator; 4-exciting rod; 5-dynamic force sensor; 6-clamp block; 7-top block; 8-jack ;9-bench; 10-induction pipe to be tested; 11-induction plate; 12-sensor; 13-data collector; 14-computer; 15-oil pressure gauge; 16-oil pump; 17-sensor support frame; 18-bracket; 19-installation nut; 20-press block.

Detailed ways

In order to make the purpose, technical effects and technical solutions of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments It is a part of the embodiment of the present invention. Based on the disclosed embodiments of the present invention, other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall all fall within the protection scope of the present invention.

Referring to Fig. 1 and Fig. 2, a test system for non-rotating vibration response characteristics of a tubular vortex reducer according to an embodiment of the present invention is mainly composed of an input part, a test part and an output part.

The input part includes: a function signal generator 1 and a power amplifier 2; wherein, a sinusoidal steady-state signal of a certain frequency is generated by the function signal generator 1, and the signal is amplified by the power amplifier 2 as the input excitation signal of the system;

The test part is mainly composed of vortex reducer foundation fixing device, top force load application and measurement device, excitation force application and measurement device, vortex reducer vibration response measurement device, etc.

In the embodiment of the present invention, the base fixing device of the vortex reducer includes: a stand 9, a clamp block 6, an air induction plate 11, and an air induction pipe to be tested 10 (including an air induction pipe to be tested without a damping pipe and an air induction pipe to be tested with There are two types of bleed pipes of damping pipes to be tested). The platform 9 on both sides is placed on the vibration isolation foundation platform, the bottom plate is fastened by anchor bolts, and the top is connected by a beam with threads at both ends. The air-inducing tube to be tested 10 and the air-inducing disc 11 are fastened to the clamping block by bolts in the axial and radial directions, simulating the displacement constraints encountered in actual work.

The jacking load applying and measuring device includes: an oil pump 16 , an oil pressure gauge 15 , a jack 8 , a jacking block 7 and a pressing block 20 .

The device for applying and measuring the excitation force includes: an exciter 3 , an excitation rod 4 with variable cross-section and a dynamic force sensor 5 .

The vibration response measuring device of the vortex reducer consists of a sensor support frame 17 and a preset type of sensor 12, and the preset type of sensor 12 includes an eddy current displacement sensor and an acceleration sensor. Fix the sensor support frame 17 on the base of the stand 9, respectively install the eddy current displacement sensor and the acceleration sensor on the bracket 18 stretched out from the sensor support frame 17, and adjust the positions of the bracket 18 and the mounting nut 19, so that the sensor An appropriate measurement gap is maintained between the head of the bleed tube 12 and the surface of the measured point of the bleed tube to be tested 10 .

The output part includes a multi-channel data collector 13 and a computer 14, and outputs the data signals acquired by the multi-channel data collector 13 to the computer 14 for display and storage, so as to further debug and analyze.

In the test system of the embodiment of the present invention, the attenuation response curve of the free vibration of the vortex reducer is measured by the hammer knocking method, and the natural frequency of the vortex reducer is obtained through frequency spectrum analysis; It is fastened on the clamp block by bolts in the radial direction, simulating the displacement constraint of the vortex reducer in actual work; by measuring the natural frequency, the bleed air pipe to be tested is loaded to a fully tightened state, and the load corresponding to the fully tightened state is taken as The jacking force load used in the experimental testing process; the excitation force is applied by a flexible threaded connecting rod with a narrow middle and wide sides, so that the thin rod part can fully consume the tangential load generated by the exciter under its own flexibility, eliminating The impact of additional constraints on the vortex reducer; the design of the clamp block is used to facilitate the replacement of the vortex reducer model to be tested in the experiment; among them, the two kinds of bleed pipes without damping pipe and bleed pipe with damping pipe are to be The test piece can be used to compare and explore the damping effect of the damping tube during the vibration process; the model of the induced air tube to be tested with different lengths, different diameters, and different fit clearances can be replaced to explore the changes in the vibration and response characteristics of different induced air tube structural parameters Curves and influence rules; by replacing the clamp block that is compatible with the bleed air pipe to be tested, the test system can realize the measurement of the vibration response characteristics of various vortex reducers and damping blades.

Please refer to Fig. 3, in the vortex reducer fixing device, the jacking force load application and measuring device of the embodiment of the present invention, the jack 8 is placed on the base of the stand 9, the top block 7 is loaded, and the side bolts are connected with the pressure block 20 connected. Fix the pressing block 20 on the stand 9, and screw the upper end face bolts of the pressing block 20 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 to the jack 8. By adjusting the oil pump 16, the vortex reducer is jacked up according to the required jacking force, and the jacking force value is read on the oil pressure gauge 15. The air-inducing pipe and the air-inducing disc are fastened on the clamping block by bolts in the axial and radial directions, simulating the displacement constraint of the vortex reducer in actual work.

Please refer to FIG. 4 , the excitation force applying and measuring device of the embodiment of the present invention. The vibrator 3 and the bleed tube to be tested 10 are connected through a variable-section exciting rod 4. The exciting rod 4 is divided into two sections, and the middle is connected by a dynamic force sensor 5 for real-time measurement of the exciting force. Exciting rod 4 (flexible threaded connecting rod with variable cross-section) is used to apply the exciting force, so that the thin rod part can fully consume the tangential load generated by the exciter under its own flexibility, and eliminate the influence of additional constraints on the vortex reducer.

Please refer to FIG. 5 , which is a schematic diagram of a vibration response measuring device of a vortex reducer according to an embodiment of the present invention. The sensor support frame 17 is fixed on the base of the stand 9, the eddy current displacement sensor and the acceleration sensor are respectively installed on the bracket 18 that the support frame stretches out, and the positions of the bracket 18 and the mounting nut 19 are adjusted so that the sensor's 12 An appropriate measurement gap is maintained between the head and the surface of the measured point on the air-inducing tube under test 10 .

Please refer to Fig. 6, a non-rotating vibration response test method of a tubular vortex reducer according to an embodiment of the present invention, based on the above-mentioned test system of the present invention, includes the following steps:

Step 1, install the air induction pipe (without damping pipe) and air induction plate of the vortex reducer to be tested in the clamp block, install the clamp block to the top block and fasten it with bolts, and use the oil pressure gauge to control the applied top pressure. force load monitoring;

Step 2: After applying a small initial pressure load to the vortex reducer with a hydraulic jack, the attenuation response curve of the free vibration of the vortex reducer is measured by the hammer striking method, and a part of the free vibration of the vortex reducer is obtained through frequency spectrum analysis. The first-order bending natural frequency f ₀ , and then use the jack to increase the load step by step, and measure the natural frequency f _i of the vortex reducer at the i-th loading respectively. After several measurements, it is found that the n-th loading vortex reducer natural frequency f _n and The relative error between the n-1th frequency f _n-1 is less than 0.2%. It is considered that after the n-th loading, the vortex reducer and the clamp block are already in a fully tightened state, and the load corresponding to the n-th loading is taken as Jacking loads used during experimental testing;

Step 3, adjust the distance between the measuring end of the eddy current displacement sensor installed on the bracket and the surface of the vortex reducer, so that it is within a suitable range, that is, about 0.5mm, so that the measured value is within the linear measurement range of the sensor In order to ensure the measurement accuracy;

Step 4: Use flexible threaded connecting rods to connect the vibrator and the bleed pipe to be tested, so that the simple harmonic steady-state vibration signal output by the vibrator is transmitted to the vortex reducer to realize the loading of the exciting force. The dynamic force sensor is used to measure the exciting force applied to the vortex reducer, and adjust the power amplifier to stabilize the amplitude of the exciting force at a given value;

Step 5, using an eddy current displacement sensor to measure the vibration displacement responses at different positions of 100%, 80% and 50% of the length of the bleed air pipe, and changing the excitation frequency to obtain the amplitude-frequency response curve of the bleed air pipe at each measuring point;

Step 6. After the above measurement obtains the vibration frequency response curve under the action of a certain amplitude excitation force load, change the amplitude of the excitation force, repeat the operation after step 5 to measure, and obtain the vibration frequency response curve under the action of a certain amplitude excitation force load. The vibration frequency response curve of

Step 7, replace the model of the bleed pipe to be tested with different lengths, diameters and fit clearances, repeat steps 2 to 6, and obtain the variation curves of the bleed pipe vibration and response characteristics under different structural parameters;

Step 8, replace the model to be tested with the air induction pipe with the damping pipe. During the installation process, the matching gap between the air induction pipe and the damping pipe should be well controlled to avoid interference. Repeat steps 2 to 6 to explore the damping effect of the damping tube during the vibration of the vortex reducer;

Step 9, replace the damping tube model with different lengths, slot numbers and slot depths, repeat steps 2 to 6, and obtain the change curves of the vibration and response characteristics of the air induction tube under different damping tube structural parameters.

In the method of the present invention, the air-inducing tube and the air-inducing disc are connected to the clamping block by bolts, which is convenient for disassembly and replacement. By replacing the air-inducing tube to be tested, the variation curves of the structural parameters of different air-inducing tubes and damping tubes on vibration and response characteristics can be explored. and the law of influence; the top block and the pressure block are combined fixtures to maintain and support the basic load imposed by the experiment, and the design of the clamp block can be adapted according to the form of the bleed tube to be tested, so as to achieve various reductions Measurement of vibration response characteristics of vortex and damper blades.

To sum up, the embodiment of the present invention discloses a test system and method for the vibration response characteristics of a tubular vortex reducer. The measuring device and the vibration response measuring device of the vortex reducer are composed. The attenuation response curve of the free vibration of the vortex reducer is measured by the hammer knocking method, and the natural vibration frequency of the vortex reducer can be obtained through frequency spectrum analysis; there are two kinds of bleed air pipes without damping pipe and bleed pipe with damping pipe To conduct experiments on the parts to be tested, the damping effect of the damping tube during the vibration process can be compared and explored. The model of the induced air tube to be tested with different lengths, different diameters, and different fit clearances can be replaced, and the influence of different structural parameters of the induced air tube on vibration and response characteristics can be explored. The change curve and influence law, and by replacing the clamp block that is compatible with the bleed pipe to be tested, the test system can realize the measurement of the vibration and response characteristics of various tubular vortex reducers. It is of great significance to study the action mechanism of the vortex reducer, suppress the vibration of the vortex reducer, and explore the coupling vibration law of the tubular vortex reducer and the bleed plate.

The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art can still modify or equivalently replace the specific embodiments of the present invention. , any modifications or equivalent replacements that do not deviate from the spirit and scope of the present invention are within the protection scope of the claims of the present invention pending application.

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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