CN115876417A - Dynamic excitation device of high-speed rotating equipment and use method and application thereof - Google Patents
Dynamic excitation device of high-speed rotating equipment and use method and application thereof Download PDFInfo
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- CN115876417A CN115876417A CN202211733887.6A CN202211733887A CN115876417A CN 115876417 A CN115876417 A CN 115876417A CN 202211733887 A CN202211733887 A CN 202211733887A CN 115876417 A CN115876417 A CN 115876417A
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Abstract
The invention discloses a dynamic excitation device of high-speed rotating equipment, and a use method and application thereof. The dynamic excitation device of the high-speed rotating equipment comprises a flange fixedly arranged on the high-speed rotating equipment, a pump body fixedly connected with the flange, a cylinder body arranged below the pump body and a guide ring which is driven by the high-speed rotating equipment and rotates in the pump body; and a vibration exciter is arranged in the pump body and provides external excitation for the guide ring. The dynamic excitation device of the high-speed rotating equipment applies excitation to the guide ring through the vibration exciter, can excite a rotor system of a rotating part of the rotating equipment in a high-speed running state, and can realize dynamic excitation of a rotor-bending vibration mode.
Description
Technical Field
The invention relates to the technical field of vibration testing, in particular to a dynamic excitation device of high-speed rotating equipment and a using method and application thereof.
Background
The high-speed rotating equipment is widely applied to the production of various stable isotopes, and the rotor dynamics analysis and test technology of the high-speed rotating equipment is concerned in model development and industrial application. Different from conventional low-rotation-speed rotating mechanical products, the high-speed rotating equipment has strict requirements on the rotation speed and reliability index of a rotating component, namely a rotor, so that the research on the rotor dynamics problem of the high-speed rotating equipment is very critical.
For subcritical high speed rotating equipment, it is required that the ratio of a bending critical frequency of the rotor to the operating rotational frequency is greater than 1. Due to the existence of the gyroscopic effect, the modal frequency of a rotating component-rotor system changes along with the change of the rotating speed, and the modal frequency obtained by the excitation of the rotor under the static state cannot represent the critical frequency of the rotor. Limited by test equipment and rotor strength, the capability of acquiring critical frequency by an accelerated test mode is not provided at present. Theory and experimental research work is not systematically developed in the aspect of excitation testing under the rotation state of the rotor, the critical frequency is mainly obtained by a theoretical analysis means, and direct experimental test data support is not available. With the improvement of the development level of high-speed rotating equipment, the research on the dynamic excitation technology of the rotor is increasingly urgent, and the realization of the dynamic excitation test of the rotor has important significance for improving the stability evaluation level of the existing high-speed rotating equipment.
Disclosure of Invention
The invention aims to provide a dynamic excitation device of high-speed rotating equipment, aiming at the technical defects in the prior art.
The invention also aims to provide a using method of the dynamic excitation device of the high-speed rotating equipment.
The invention further aims to provide application of the using method in dynamic excitation testing.
The technical scheme adopted for realizing the purpose of the invention is as follows:
a dynamic excitation device of high-speed rotating equipment comprises a flange fixedly arranged on the high-speed rotating equipment, a pump body fixedly connected with the flange, a cylinder body arranged below the pump body and a guide ring which is driven by the high-speed rotating equipment and rotates in the pump body; and a vibration exciter is arranged in the pump body and provides external excitation for the guide ring.
In the technical scheme, the side surface of the pump body is provided with a threaded hole.
In the technical scheme, the surface of the vibration exciter is provided with threads, and the vibration exciter is installed in the threaded hole through the threads.
In the technical scheme, the distance between the vibration exciter and the lower end face of the flange is 1 mm.
In the technical scheme, the working end face of the vibration exciter is close to the edge of the inner wall of the pump body.
In the technical scheme, the distance between the working end face of the vibration exciter and the guide ring is 1 mm.
In the technical scheme, the upper part of the pump body is fixedly connected with the flange through a bolt.
In the technical scheme, the lower part of the pump body is in interference connection with the cylinder body.
In another aspect of the present invention, the method for using the dynamic excitation device for high-speed rotating equipment includes the following steps:
s1: installing a vibration exciter in the pump body; the guide ring is connected with high-speed rotating equipment and is placed in a cavity in the pump body;
s2: opening the high-speed rotating equipment, and driving the guide ring to rotate;
s3: opening a vibration exciter and setting a sweep frequency excitation mode; the electromagnetic force generated by the vibration exciter excites the guide ring to make it vibrate along the axial direction of the vibration exciter.
S4: measuring the vibration response of the rotor under excitation, judging through FFt conversion peak value, and recording the vibration frequency of one bend of the rotor and the corresponding amplitude value.
In the technical scheme, in S2, the rotating speed of the guide ring is less than or equal to 500r/min, and the output electromagnetic force is less than 3N.
In the technical scheme, the starting frequency of the sweep frequency excitation mode is 1900Hz; the termination frequency was 2000Hz.
In the above technical solution, the sweep interval of the sweep excitation mode is 1Hz.
In another aspect of the invention, the application method is applied to dynamic excitation testing.
In another aspect of the present invention, the rotation speed of the guide ring 4 is set to 50, 200, 300, 500; and obtaining a bending frequency at the corresponding rotating speed. And then drawing a relation curve between the rotating speed and the bending frequency so as to estimate the bending frequency of the rotor at the working rotating speed.
Compared with the prior art, the invention has the beneficial effects that:
1. the dynamic excitation device for the high-speed rotating equipment, provided by the invention, can excite the rotor system of the rotating part of the rotating equipment in a high-speed running state by exciting the guide ring through the vibration exciter, and can realize the excitation of a rotor-bending vibration mode in a dynamic state.
2. The use method of the dynamic excitation device of the high-speed rotating equipment can measure the one-bending vibration mode of the rotor at different rotating speeds.
3. The practical method of the dynamic vibration excitation device of the high-speed rotating equipment is applied to dynamic vibration excitation test, the phenomenon that the one-bending vibration frequency of the rotor increases along with the rotation speed of the rotor is obtained through the test and is consistent with the theoretical calculation trend, and the calculation result of the numerical calculation model of the rotor-supporting system is verified.
Drawings
Fig. 1 is a schematic structural diagram of a dynamic excitation device of a high-speed rotating apparatus.
In the figure: 1-flange, 2-pump body, 3-cylinder, 4-guide ring, 5-vibration exciter, 6-threaded hole and 7-screw.
Detailed Description
The present invention will be described in further detail with reference to specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
A dynamic excitation device of high-speed rotating equipment comprises a flange 1 fixedly arranged on the high-speed rotating equipment, a pump body 2 fixedly connected with the flange, a cylinder body 3 arranged below the pump body 2 and a guide ring 4 driven by the high-speed rotating equipment and rotating in the pump body, wherein the guide ring 4 is arranged on the pump body; a vibration exciter 5 is installed in the pump body 2, and the vibration exciter 5 provides external excitation for the guide ring 4.
Example 2
In this embodiment, detailed configuration information is described on the basis of embodiment 1.
A threaded hole 6 is formed in the side surface of the pump body 2; the surface of the vibration exciter 5 is provided with threads, and the vibration exciter 5 is installed in the threaded hole 6 through the threads. The vibration exciter 5 is 1mm away from the lower end face of the flange 1. The working end face of the vibration exciter 5 is close to the edge of the inner wall of the pump body 2 and is about 1mm away from the guide ring 4. The output power and excitation mode of the exciter 5 can be adjusted by external means. When the vibration exciter 5 works, the output exciting force does not exceed 3N.
The upper part of the pump body 2 is connected with the flange 1 through a screw 7.
The lower part of the pump body 2 is in interference connection with the cylinder body 3. The cylinder 3 is cylindrical and forms an operation protection structure with the pump body 2.
The guide ring 4 is a circular ring structure made of a magnetic material and serves as an excited object in the device. The guide ring 4 is positioned in the cavity of the pump body 2 and is about 1mm away from the inner wall of the pump body. And the upper end of the flange is close to the edge of the flange 1 and is connected with high-speed rotating equipment.
Example 3
This example is based on examples 1 and 2 and describes the method of use.
The use method of the dynamic excitation device of the high-speed rotating equipment comprises the following steps:
s1: the vibration exciter 5 is arranged inside the pump body 2; the guide ring 4 is connected with high-speed rotating equipment and is placed in a cavity in the pump body 2;
s2: opening the high-speed rotating equipment to drive the guide ring 4 to rotate;
s3: turning on a vibration exciter 5 and setting a frequency sweeping excitation mode; the electromagnetic force generated by the vibration exciter 5 excites the guide ring to make it vibrate along the axial direction of the vibration exciter.
S4: measuring the vibration response of the rotor under excitation, judging through FFt conversion peak value, and recording the vibration frequency of one bend of the rotor and the corresponding amplitude value.
Example 4
The present embodiment is described based on embodiment 3, and its application in the dynamic excitation test of the rotor is described.
The purpose of the dynamic excitation device of the high-speed rotating equipment is to obtain the actual critical frequency of the rotor through tests. The guide ring 4 is excited by the vibration exciter 5, and then the rotor is excited (the guide ring 4 is connected with the rotor), when the excitation frequency of the vibration exciter 5 is consistent with the critical frequency of one turn of the rotor, the amplitude of the rotor is increased, and the resonance amplitude is generated. When the vibration signal is picked up by the sensor and subjected to spectrum analysis, the position of a frequency peak can be observed, and the excitation frequency corresponding to the position is regarded as a bending frequency of the rotor.
The rotor system may be excited and its amplitude dispersed after resonance, resulting in instability of the rotor system and even failure of the fryer. Therefore, the rotating speed of the guide ring 4 in the dynamic test is controlled within 500r/min, and the output electromagnetic force is less than 3N.
There are two methods for obtaining a bending frequency by applying the dynamic excitation device of the high-speed rotating equipment.
First, the rotation speed of the guide ring 4 is set to 50r/min, 200r/min, 300r/min, 500r/min, respectively, by the method of embodiment 3; and obtaining a bending frequency at the corresponding rotating speed. And then drawing a relation curve between the rotating speed and the bending frequency so as to estimate the bending frequency of the rotor at the working rotating speed.
Second, a bending frequency was obtained directly at the operating speed according to the method of example 3.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (14)
1. A kind of high-speed rotating equipment dynamic excitation device, characterized by that: the guide ring is driven by the high-speed rotating equipment and rotates in the pump body; and a vibration exciter is arranged in the pump body and provides external excitation for the guide ring.
2. The dynamic excitation device for a high-speed rotating apparatus as claimed in claim 1, wherein: and a threaded hole is formed in the side surface of the pump body.
3. The dynamic excitation device for high-speed rotating equipment as claimed in claim 2, wherein: the surface of the vibration exciter is provided with threads, and the vibration exciter is installed in the threaded hole through the threads.
4. The dynamic excitation device for a high-speed rotating apparatus as claimed in claim 1, wherein: the vibration exciter is 1mm away from the lower end face of the flange.
5. The dynamic excitation device for high-speed rotating equipment as claimed in claim 4, wherein: the working end face of the vibration exciter is close to the edge of the inner wall of the pump body.
6. The dynamic excitation device for high-speed rotating equipment as claimed in claim 5, wherein: the working end face of the vibration exciter is 1mm away from the guide ring.
7. The dynamic excitation device for a high-speed rotating apparatus as claimed in claim 1, wherein: the upper part of the pump body is fixedly connected with the flange through a bolt.
8. The dynamic excitation device for high-speed rotating equipment as claimed in claim 7, wherein: the lower part of the pump body is in interference connection with the cylinder body.
9. The use method of the dynamic excitation device of the high-speed rotating equipment as claimed in any one of claims 1 to 8, wherein: the method comprises the following steps:
s1: installing a vibration exciter in the pump body; the guide ring is connected with high-speed rotating equipment and is placed in a cavity in the pump body;
s2: opening the high-speed rotating equipment to drive the guide ring to rotate;
s3: opening a vibration exciter and setting a sweep frequency excitation mode; the electromagnetic force generated by the vibration exciter excites the guide ring to make it vibrate along the axial direction of the vibration exciter.
S4: measuring the vibration response of the rotor under excitation, judging through FFt conversion peak value, and recording the vibration frequency of one bend of the rotor and the corresponding amplitude value.
10. Use according to claim 9, characterized in that: in S2, the rotating speed of the guide ring is less than or equal to 500r/min, and the output electromagnetic force is less than 3N.
11. Use according to claim 10, characterized in that: the starting frequency of the sweep frequency excitation mode is 1900Hz; the termination frequency was 2000Hz.
12. Use according to claim 11, characterized in that: the sweep interval of the sweep excitation mode is 1Hz.
13. Use of the method according to claims 9-12 in dynamic excitation testing.
14. The use of claim 13, wherein: firstly, setting the rotation speed of the guide ring 4 to be 50r/min, 200r/min, 300r/min and 500r/min respectively through the use method of the claims 9-12; and obtaining a bending frequency at the corresponding rotating speed. And then drawing a relation curve between the rotating speed and the bending frequency so as to estimate the bending frequency of the rotor at the working rotating speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211733887.6A CN115876417A (en) | 2022-12-30 | 2022-12-30 | Dynamic excitation device of high-speed rotating equipment and use method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211733887.6A CN115876417A (en) | 2022-12-30 | 2022-12-30 | Dynamic excitation device of high-speed rotating equipment and use method and application thereof |
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| Publication Number | Publication Date |
|---|---|
| CN115876417A true CN115876417A (en) | 2023-03-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211733887.6A Pending CN115876417A (en) | 2022-12-30 | 2022-12-30 | Dynamic excitation device of high-speed rotating equipment and use method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115876417A (en) |
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- 2022-12-30 CN CN202211733887.6A patent/CN115876417A/en active Pending
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