CN115265979A - Evaluation device and evaluation method for rotor blade vibration test system by blade tip timing method - Google Patents
Evaluation device and evaluation method for rotor blade vibration test system by blade tip timing method Download PDFInfo
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- CN115265979A CN115265979A CN202210883966.9A CN202210883966A CN115265979A CN 115265979 A CN115265979 A CN 115265979A CN 202210883966 A CN202210883966 A CN 202210883966A CN 115265979 A CN115265979 A CN 115265979A
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- 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
- G01M7/022—Vibration control arrangements, e.g. for generating random vibrations
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The invention discloses a rotor blade vibration test system evaluation device adopting a blade tip timing method, which comprises a driving motor, a simulation impeller connected with an output shaft of the driving motor, a strong magnetic excitation piece arranged around the simulation impeller and used for emitting magnetic field excitation to enable simulation blades on the simulation impeller to resonate when rotating, a strain assembly arranged on the simulation blades of the simulation impeller and used for measuring strain signals for obtaining the strain condition of a simulation blade body, a remote measurement system electrically connected with the strain assembly and used for transmitting the strain signals, a first data processor electrically connected with the remote measurement system and used for processing the strain signals to obtain the vibration frequency of the simulation blades and the vibration stress of the simulation blade body, a simulation casing circumferentially arranged on the periphery of the simulation impeller, a timing sensor arranged on the simulation casing and used for sensing a time sequence of the arrival time of the blade tips of the simulation blades, a second data processor electrically connected with the timing sensor and a simulation analyzer.
Description
Technical Field
The invention relates to the technical field of engine evaluation, in particular to an evaluation device of a rotor blade vibration test system by a blade tip timing method. In addition, the invention also relates to a blade tip timing method rotor blade vibration test system evaluation method for evaluating by adopting the blade tip timing method rotor blade vibration test system evaluation device.
Background
The blade of the aero-engine is one of the most critical parts of the aero-engine, the working environment is severe, the design and test technology is complex, the technical requirements for processing and detection are high, and the blade is a product with intensive knowledge and technology. When the blades of the aircraft engine are in a working state, the blades are easily vibrated under the action of gas exciting force and mechanical exciting force, and the vibration of the rotating mechanical blades is one of important factors causing mechanical faults of the rotating mechanical blades, so that the vibration of the rotating blades is very necessary to be monitored in real time. The general specifications of foreign military engines and civil aviation airworthiness regulations place blade dynamic stress measurement at an important position, the blade of an aeroengine is required to be ensured to avoid resonance caused by a known excitation source in the design stage, and the vibration characteristics of the blade are determined to be within an acceptable range compared with the characteristics expected by the design through verification tests, wherein the verification tests comprise the measurement of the vibration stress and the vibration frequency of the blade in the working process under the conditions of parts, a core machine or a complete machine.
In the aspect of rotor blade vibration testing technology, a great deal of research work is done by some domestic and foreign research institutions, and certain effect is achieved. At present, the method for testing the vibration of the rotor blade mainly comprises the following steps: "contact strain gage method" and "non-contact tip timing method". The contact strain gage method is characterized in that a certain number of strain gages are adhered to a blade, and a strain signal is transmitted to external strain testing equipment through an electric initiator to be tested. The technology has high test accuracy, but the patch lead wire process is complex, the preparation period is long, the technical difficulty is high, strain measuring points are easy to lose effectiveness due to severe working environment, only the vibration condition of the blade attached with the strain gauge can be tested, the number of the blades which can be tested at one time is limited, in addition, structural modification for testing has more or less influence on the mechanical property and the pneumatic property of an engine, and the technology cannot be used as a means for monitoring the blade vibration for a long time. In the implementation process of the non-contact type blade tip timing method, the sensor is arranged on a relatively static casing instead of a rotating blade, namely, the measured blade is not in contact with the measuring sensor, the structure of the engine is not required to be greatly modified, and the non-contact type blade tip timing method has the characteristics of short preparation period, long working time of the sensor, capability of simultaneously performing vibration test on all blades at the same level and less influence on the performance of the engine, and can be used as a long-time monitoring means for blade vibration. The blade tip timing method is a research hotspot of the current non-contact type rotating blade vibration testing technology and is developed on the basis of an intermittent phase method and a pulse modulation method. The basic principle of the blade tip timing method is that a blade tip timing sensor is mounted on a casing, the sensor is used for sensing the arrival time of the blade tip, if the blade vibrates, the arrival time of the blade tip can be advanced or lagged, and the time sequence is processed through different blade tip timing processing algorithms, so that the information such as the vibration frequency of the blade and the vibration displacement of the blade tip can be obtained. Because the tip timing method belongs to a typical undersampling mode, the working principle and the data processing algorithm of the tip timing method are very special, so that the conventional metrological verification method is difficult to carry out metrological calibration on the aspect of test accuracy on the test system based on the tip timing principle in practical application.
In order to evaluate the accuracy of the test result of the tip timing method in engineering, the blade body vibration stress is generally obtained by using a contact strain gauge method, then the corresponding relation between the tip vibration displacement and the blade body vibration stress is obtained by using finite element analysis, and finally the result obtained by using the strain gauge method and the result obtained by using the non-contact tip timing method are quantitatively compared, analyzed and evaluated by using the corresponding relation. The existing evaluation device for the rotor blade vibration test system based on the tip timing method generally designs a special rotor test piece and a casing, a strain gauge is pasted at the blade body of a rotor blade, and then the test piece is installed on a large-scale rotor tester to be driven in a rotating mode. The high-speed airflow is used as a vibration excitation source during the rotation of the blade. A slip ring current leading device is used as a signal transmission device, and a vibration strain signal on a rotating blade is transmitted to a relatively static strain test system through the friction contact of a brush ring and a brush wire in the current leading device. In the test process, a rotor part of the electric initiator is fixedly connected with a cantilever end of a rotor to be tested, and a stator part (such as an electric initiator shell) is fixed on a test piece casing or a special support. Meanwhile, a rotor blade vibration testing system based on blade tip timing is applied to carry out vibration testing on the rotary blade, so that two vibration testing results are obtained in the same time period, and the accuracy of the blade tip timing method testing results is evaluated.
However, because the existing evaluation device of the rotor blade vibration test system based on the tip timing method usually adopts an electrical initiator as a signal transmission device based on the contact strain gauge method, the equipment composition and the installation procedures of all links are very complicated, and the requirement on test operators is very high. In addition, in the test process, the bearing of the electric starter needs to be lubricated continuously, and the brush ring and the brush wire in the electric starter need to be cooled, so that a complex cooling system needs to be arranged for the electric starter on the test site. Even so, the test still has higher risk because the lubricating and cooling links of the electricity guiding device have the possibility of being burnt out when the pool is slightly poor. In order to ensure the smooth operation of the test, a plurality of operation posts are required to be arranged in the test process, and a plurality of people cooperate with each other to complete the work of each link during the test.
In summary, the existing evaluation device for the rotor blade vibration test system based on the tip timing method has the disadvantages of complex structure, complex operation, high test risk and high consumption of manpower and material resources.
Disclosure of Invention
The invention provides an evaluation device of a rotor blade vibration test system based on a tip timing method, which aims to solve the technical problems of complex structure, complex operation, high test risk and high consumption of manpower and material resources of the existing evaluation device of the rotor blade vibration test system based on the tip timing method.
According to one aspect of the invention, the evaluation device for the rotor blade vibration testing system based on the tip timing method comprises a driving motor, a simulation impeller connected with an output shaft of the driving motor, a strong magnetic excitation piece arranged around the simulation impeller and used for emitting magnetic field excitation to enable simulation blades on the simulation impeller to resonate when rotating, a strain component arranged on the simulation blades of the simulation impeller and used for measuring strain signals for obtaining the strain condition of a simulation blade body, a remote measurement system electrically connected with the strain component and used for transmitting the strain signals, a first data processor electrically connected with the remote measurement system and used for processing the strain signals to obtain the vibration frequency of the simulation blades and the vibration stress of a simulation blade body, a simulation casing circumferentially arranged on the periphery of the simulation impeller, a timing sensor arranged on the simulation casing and used for sensing a time sequence of the arrival time of the tips of the simulation blades, a second data processor electrically connected with the timing sensor and used for processing the time sequence of the arrival time of the tips of the simulation blades to obtain the vibration frequency of the simulation blades and the vibration displacement of the tips of the simulation blades, and a lower die blade vibration displacement analyzer used for performing modal analysis on the simulation blades to obtain the corresponding relationship between the tips of the vibration of the simulation blades and the vibration displacement of the simulation blades.
As a further improvement of the above technical solution:
further, the simulation impeller includes a connecting shaft connected with an output shaft of the driving motor and a plurality of simulation blades arranged on the connecting shaft at intervals in the circumferential direction.
Further, the strain assembly comprises a strain gauge attached to the blade body of the simulation blade and a strain transmission lead wire connected with the strain gauge and the telemetry system respectively.
Furthermore, the telemetering system comprises a telemetering system transmitting end arranged on the cantilever end of the connecting shaft and connected with the strain transmission lead, a telemetering system receiving end in radio connection with the telemetering system transmitting end, and a telemetering system data processor respectively and electrically connected with the telemetering system receiving end and the first data processor.
Furthermore, the connecting shaft is provided with a connecting cavity along the axial direction, the wall surface of the connecting shaft is provided with a connecting hole communicated with the connecting cavity along the radial direction, and the strain transmission lead is arranged in the connecting hole in a penetrating way to be connected with the transmitting end of the remote measuring system.
Furthermore, a first flange mounting edge is arranged at the cantilever end of the connecting shaft, and a second flange mounting edge which is connected with the first flange mounting edge is arranged at the transmitting end of the remote measuring system.
According to another aspect of the present invention, there is also provided a method for evaluating a blade tip timing method rotor blade vibration test system, which adopts the above apparatus for evaluating a blade tip timing method rotor blade vibration test system to perform evaluation, including the following steps: s1, driving a simulated impeller to rotate by the operation of a driving motor, and enabling a strong magnetic excitation piece to send out magnetic field excitation so as to enable simulated blades on the simulated impeller to resonate when rotating; s2, strain signals simulating the strain condition of the blade body of the blade are obtained through measurement of the strain assembly, the strain signals are transmitted to a first data processor through a remote measuring system, and the strain signals are processed through the first data processor to obtain the vibration frequency of the simulated blade and the vibration stress of the blade body of the simulated blade; meanwhile, sensing a time sequence of the arrival time of the simulated blade tip to a second data processor through a timing sensor, and processing the time sequence of the arrival time of the simulated blade tip through the second data processor to obtain the vibration frequency of the simulated blade and the vibration displacement of the simulated blade tip; and S3, performing modal analysis on the simulated impeller through the simulation analyzer to obtain the corresponding relation between the simulated blade tip vibration displacement and the simulated blade body vibration stress under the simulated blade resonance rotating speed, and then performing accuracy evaluation on the simulated blade vibration frequency and the simulated blade tip vibration displacement obtained by the second data processor according to the corresponding relation between the simulated blade tip vibration displacement and the simulated blade body vibration stress and the simulated blade vibration frequency and the simulated blade body vibration stress obtained by the first data processor.
As a further improvement of the above technical solution:
further, step S1 is preceded by the steps of: s0, determining the radius of a wheel body of the simulated impeller, the length of the simulated blades and the thickness of the simulated blades according to the vertical distance between the center of an output shaft of the driving motor and a base of the driving motor, determining the width of the simulated blades and the number of the simulated blades according to the wind resistance influence generated by the ambient air when the simulated blades rotate and the power of the driving motor, and then obtaining the first-order modal frequency of the simulated blades according to an empirical formula, wherein the empirical formula is F =810092H/I2, F is frequency, H is the thickness of the simulated blades, and I is the length of the simulated blades.
Further, the method between S0 and S1 further comprises the following steps: modal analysis is carried out on the simulated impeller through the simulation analyzer to obtain the first-order modal frequency of the simulated blade so as to verify the first-order modal frequency of the simulated blade obtained according to an empirical formula, and then the feasibility of the structural dimension design scheme of the simulated impeller is verified.
Further, the method between S0 and S1 further comprises the following steps: modal analysis is carried out on the simulated impeller through the simulation analyzer, a first-order modal vibration stress distribution calculation result of the simulated blade is obtained, the mounting position of the strain assembly is determined according to the first-order modal vibration stress distribution calculation result of the simulated blade, and then the strain assembly is mounted.
The invention has the following beneficial effects:
the invention relates to an evaluation device of a blade tip timing method rotor blade vibration test system, which comprises the steps of firstly driving a simulation impeller to synchronously rotate through a driving motor, sending magnetic field excitation through a strong magnetic excitation piece to enable the simulation blade on the simulation impeller to resonate when rotating, then obtaining a strain signal simulating the blade body strain condition when simulating the blade resonance through the measurement of a strain assembly, transmitting the strain signal through a remote measuring system, processing the strain signal through a first data processor to obtain the simulation blade vibration frequency and the simulation blade body vibration stress, simultaneously sensing a time sequence of the arrival moment of the simulation blade tip through a timing sensor, processing the time sequence of the arrival moment of the simulation blade through a second data processor to obtain the simulation blade vibration frequency and the simulation blade tip vibration displacement, finally performing modal analysis on the simulation blade through a simulation analyzer to obtain the corresponding relation between the simulation blade tip vibration displacement of the simulation blade at the simulation blade resonance speed and the simulation blade body vibration stress, using the simulation blade tip vibration displacement obtained by the first simulator and the simulation blade body vibration stress obtained by the simulation as the simulation blade tip vibration stress and the simulation blade body vibration stress obtained by the first simulator, and using the simulation blade tip vibration stress as a simple and other simulation device, and using the existing strong magnetic excitation medium as a simple and convenient remote measuring driving device for the existing technology for the simulation blade tip vibration excitation device for the simulation blade tip vibration operation, and the simulation blade. The remote measuring system does not need lubrication and cooling, so that the risk level in the test process is obviously reduced, and the manpower and material resources are saved.
In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural diagram of a blade tip timing method rotor blade vibration test system evaluation device according to a preferred embodiment of the present invention;
FIG. 2 isbase:Sub>A sectional view taken along line A-A of the apparatus for evaluating the tip timing rotor blade vibration test system shown in FIG. 1.
Illustration of the drawings:
1. driving a motor; 2. simulating an impeller; 21. a connecting shaft; 211. connecting holes; 22. simulating a blade; 3. a strain component; 31. a strain gauge; 32. a strain transmission lead; 4. a telemetry system; 41. a telemetry system transmitting end; 5. and simulating a case.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the accompanying drawings, but the invention can be embodied in many different forms, which are defined and covered by the following description.
FIG. 1 is a schematic structural diagram of an evaluation device of a tip timing method rotor blade vibration test system according to a preferred embodiment of the present invention;
FIG. 2 isbase:Sub>A sectional view taken along line A-A of the apparatus for evaluating the tip timing rotor blade vibration test system shown in FIG. 1.
As shown in fig. 1 and fig. 2, the evaluation device of the blade tip timing method rotor blade vibration test system according to the embodiment includes a driving motor 1, a simulated impeller 2 connected to an output shaft of the driving motor 1, a strong magnetic excitation member arranged around the simulated impeller 2 and used for emitting magnetic field excitation to cause the simulated blade 22 on the simulated impeller 2 to resonate when rotating, a strain assembly 3 arranged on the simulated blade 22 of the simulated impeller 2 and used for measuring a strain signal for obtaining a blade body strain condition of the simulated blade 22, a remote measurement system 4 electrically connected to the strain assembly 3 and used for transmitting the strain signal, a first data processor electrically connected to the remote measurement system 4 and used for processing the strain signal to obtain a vibration frequency of the simulated blade 22 and a blade body vibration stress of the simulated blade 22, a simulated casing 5 circumferentially arranged on the periphery of the simulated impeller 2, a timing sensor arranged on the simulated casing 5 and used for sensing a time sequence of arrival times of the blade tip of the simulated blade 22, a timing sensor electrically connected to process a time sequence of arrival times of the simulated blade tip 22 to obtain a vibration frequency of the simulated blade 22 and a second data of the simulated blade tip vibration displacement of the simulated blade 22, and a corresponding relationship between the simulated blade tip vibration stress obtained by the simulated blade 22 and the simulated blade tip vibration stress analyzer. Specifically, the evaluation device of the blade tip timing method rotor blade vibration test system drives the simulation impeller 2 to synchronously rotate through the driving motor 1, sends out magnetic field excitation through the strong magnetic excitation part so as to enable the simulation blade 22 on the simulation impeller 2 to resonate when rotating, then obtains a strain signal simulating the blade body strain condition of the blade 22 when the simulation blade 22 resonates through the measurement of the strain component 3, transmits the strain signal through the remote measurement system 4 so as to process the strain signal through the first data processor so as to obtain the vibration frequency of the simulation blade 22 and the vibration stress of the blade body of the simulation blade 22, simultaneously senses the time sequence simulating the arrival time of the blade tip of the blade 22 through the timing sensor, processes the time sequence simulating the arrival time of the blade tip of the blade 22 through the second data processor so as to obtain the vibration frequency of the simulation blade 22 and the vibration displacement of the blade tip of the simulation blade 22, finally, the simulation blade 22 is subjected to modal analysis through a simulation analyzer to obtain the corresponding relation between the tip vibration displacement of the simulation blade 22 and the blade body vibration stress of the simulation blade 22 at the resonance rotating speed of the simulation blade 22, and the accuracy of the vibration frequency of the simulation blade 22 and the tip vibration displacement of the simulation blade 22 obtained by a second simulator through the corresponding relation between the tip vibration displacement of the simulation blade 22 and the blade body vibration stress of the simulation blade 22 obtained by the first simulator and the vibration frequency of the simulation blade 22 and the blade body vibration stress of the simulation blade 22 obtained by the first simulator is evaluated. And the remote measuring system 4 is used as a strain signal transmission device, compared with a power initiator in the prior art, the remote measuring system 4 does not need to be lubricated and cooled, so that the risk level in the test process is obviously reduced, and the manpower and material resources are saved. Optionally, the strong magnetic actuator is a strong magnet. Optionally, the first data processor, the second data processor and the analog analyzer are computers. It should be understood that the specific structure of the computer is well known to those skilled in the art and will not be described in excessive detail herein.
As shown in fig. 2, in the present embodiment, the dummy impeller 2 includes a connecting shaft 21 connected to the output shaft of the dynamo-electric machine 1, and a plurality of dummy blades 22 arranged on the connecting shaft 21 at intervals in the circumferential direction. Specifically, driving and rotating motor 1 works to drive connecting shaft 21 synchronous revolution through the output shaft, and then drive simulation blade 22 synchronous revolution, and then simulate out blade rotating state in the actual work process, simultaneously, driving and rotating motor 1's installation convenient operation, and need not supporting other complicated auxiliary assembly, saved manpower and materials resources.
In the present embodiment, as shown in fig. 2, the strain gauge assembly 3 includes a strain gauge 31 attached to the body of the dummy blade 22 and a strain transmission lead 32 connected to the strain gauge 31 and the telemetry system 4, respectively. Specifically, a strain signal simulating the strain condition of the blade 22 is obtained by measuring the strain gauge 31, and the strain signal is transmitted to the telemetry system 4 through the strain transmission lead 32. Alternatively, the strain gauges 31 are attached to the blade body of the dummy blade 22 by a bonding process. It should be understood that the specific steps of the pasting process are well known to those skilled in the art and will not be described in excessive detail herein.
As shown in fig. 2, in the present embodiment, the telemetry system 4 includes a telemetry system transmitting end 41 disposed on the cantilever end of the connecting shaft 21 and connected to the strain transmission lead 32, a telemetry system receiving end in radio connection with the telemetry system transmitting end 41, and a telemetry system data processor electrically connected to the telemetry system receiving end and the first data processor, respectively. Specifically, the strain signal transmitted by the strain transmission lead 32 is received through the telemetry system transmitting end 41 and is transmitted to the telemetry system receiving end, then the strain signal is transmitted to the telemetry system data processor, and finally the strain signal is transmitted to the first data processor for processing, so that the vibration frequency of the simulated blade 22 and the blade body vibration stress of the simulated blade 22 are obtained. It should be understood that the specific structure of the telemetry system transmitting end 41, the telemetry system receiving end, and the telemetry system data processor are well known to those skilled in the art and will not be described in any greater detail herein.
As shown in fig. 2, in the present embodiment, the connecting shaft 21 has a connecting cavity along the axial direction, the wall surface of the connecting shaft 21 has a connecting hole 211 communicating with the connecting cavity along the radial direction, and the strain transmission lead 32 is inserted into the connecting hole 211 to connect with the transmitting end 41 of the telemetry system. Specifically, the strain-transmitting lead 32 passes through the attachment hole 211 into the attachment cavity and then through the attachment cavity for attachment to the pad of the telemetry system transmitter end 41.
As shown in fig. 2, in this embodiment, a first flange mounting edge is disposed on the cantilever end of the connecting shaft 21, and a second flange mounting edge is disposed on the transmitting end 41 of the telemetry system and is connected to the first flange mounting edge. Specifically, the first flange mounting edge and the second flange are connected in a mounting mode to fix the transmitting end 41 of the telemetry system on the cantilever end of the connecting shaft 21, so that connection is reliable, and work is stable.
As shown in fig. 2, the evaluation method of the tip timing method rotor blade vibration test system according to the embodiment adopts the evaluation device of the tip timing method rotor blade vibration test system for evaluation, and includes the following steps: s1, driving a simulated impeller 2 to rotate by the operation of a driving motor 1, and enabling a strong magnetic excitation piece to send out magnetic field excitation so as to enable simulated blades 22 on the simulated impeller 2 to resonate when rotating; s2, strain signals simulating the blade body strain condition of the blade 22 are obtained through measurement of the strain assembly 3, the strain signals are transmitted into a first data processor through a remote measuring system 4, and the strain signals are processed through the first data processor to obtain the vibration frequency of the simulated blade 22 and the blade body vibration stress of the simulated blade 22; meanwhile, sensing the time sequence of the arrival time of the tip of the simulated blade 22 into a second data processor through a timing sensor, and processing the time sequence of the arrival time of the tip of the simulated blade 22 through the second data processor to obtain the vibration frequency of the simulated blade 22 and the vibration displacement of the tip of the simulated blade 22; and S3, performing modal analysis on the simulated impeller 2 through a simulation analyzer to obtain the corresponding relation between the tip vibration displacement of the simulated blade 22 and the blade body vibration stress of the simulated blade 22 at the resonance rotating speed of the simulated blade 22, and then performing accuracy evaluation on the vibration frequency of the simulated blade 22 and the tip vibration displacement of the simulated blade 22 obtained by the second data processor according to the corresponding relation between the tip vibration displacement of the simulated blade 22 and the blade body vibration stress of the simulated blade 22 and the vibration frequency and the blade body vibration stress of the simulated blade 22 obtained by the first data processor. Specifically, firstly, the driving and rotating motor 1 drives the simulation impeller 2 to rotate so as to simulate the actual rotation condition of the simulation impeller 2, the operation of the driving and rotating motor 1 is safe and simple, then the simulation blade 22 is excited to resonate by the strong magnetic excitation piece when rotating, the strong magnetic excitation piece is used as a resonance excitation source, compared with an excitation source which takes air or other fluid as an excitation medium, the installation operation of the strong magnetic excitation piece is safer and simpler, the strain component 3, the remote measurement system 4 and the first data processing are mutually matched in the same way so as to realize contact type strain test, the vibration frequency of the simulation blade 22 and the vibration stress of the blade body of the simulation blade 22 are obtained, in the process, the remote measurement system 4 is used as a strain signal transmission device, compared with an electrical initiator, the installation operation is more simple and convenient, and lubrication and cold air are not needed, the risk in the test process is obviously reduced, meanwhile, the timing sensor and the second data processor are mutually cooperated to obtain the vibration frequency of the simulated blade 22 and the tip vibration displacement of the simulated blade 22, the non-contact type strain test is realized, finally, the corresponding relation between the tip vibration displacement of the simulated blade 22 and the blade body vibration stress of the simulated blade 22 is obtained through the simulation analyzer, the simulation blade 22 vibration frequency and the tip vibration displacement of the simulated blade 22 obtained through the non-contact type strain test are compared and analyzed with the simulation blade 22 vibration frequency and the simulation blade 22 blade body vibration stress obtained through the previous contact type strain test, and the accuracy evaluation of the test structure of the non-contact type strain test is completed.
In this embodiment, before the step S1, the method further includes the steps of: s0, according to the vertical distance between the center of the output shaft of the driving motor 1 and the base of the driving motor 1, determining the wheel body radius of the simulation impeller 2, the length of the simulation blade 22 and the thickness of the simulation blade 22, then according to the wind resistance influence generated by the ambient air when the simulation blade 22 rotates and the power of the driving motor 1, determining the width of the simulation blade 22 and the number of the simulation blade 22, and then according to an empirical formula, obtaining the first-order modal frequency of the simulation blade 22, wherein the empirical formula is F =810092H/I2, wherein F is the frequency, H is the thickness of the simulation blade 22, and I is the length of the simulation blade 22. It should be understood that the design of the simulated impeller 2 fully considers the wind resistance influence and the power influence of the driving motor 1, and ensures that the test of the simulated impeller 2 can be performed in a normal environment and the resonance with strong response can occur in the highest rotating speed range of the motor.
In this embodiment, the step between S0 and S1 further includes: modal analysis is carried out on the simulated impeller 2 through a simulation analyzer to obtain the first-order modal frequency of the simulated blade 22, so as to verify the first-order modal frequency of the simulated blade 22 obtained according to an empirical formula, and further verify the feasibility of the structural dimension design scheme of the simulated impeller 2. Specifically, a first-order modal frequency is obtained through modal analysis to verify the first-order modal frequency obtained by the root smoke formula, so that feasibility verification of the structural size design scheme of the simulated impeller 2 is realized, and reliability of a subsequent test result is ensured.
In this embodiment, the step between S0 and S1 further includes: modal analysis is carried out on the simulated impeller 2 through a simulation analyzer, a first-order modal vibration stress distribution calculation result of the simulated blade 22 is obtained, the installation position of the strain component 3 is determined according to the first-order modal vibration stress distribution calculation result of the simulated blade 22, and then the strain component 3 is installed. Specifically, a calculation result of the first-order modal vibration stress distribution of the simulated blade 22 is obtained through simulation, and then the strain component 3 is reasonably installed, so that the accuracy of a strain signal in a subsequent testing process is improved, and the accuracy of an evaluation result is indirectly improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A rotor blade vibration test system evaluation device by a blade tip timing method is characterized in that, the device comprises a driving and rotating motor (1), a simulation impeller (2) connected with an output shaft of the driving and rotating motor (1), a strong magnetic exciting piece arranged around the simulation impeller (2) and used for emitting magnetic field excitation to enable a simulation blade (22) on the simulation impeller (2) to resonate when rotating, a strain assembly (3) arranged on the simulation blade (22) of the simulation impeller (2) and used for measuring and obtaining a strain signal simulating the blade body strain condition of the simulation blade (22), a remote measurement system (4) electrically connected with the strain assembly (3) and used for transmitting the strain signal, a first data processor electrically connected with the remote measurement system (4) and used for processing the strain signal to obtain the vibration frequency of the simulation blade (22) and the vibration stress of the blade body of the simulation blade (22), a simulation casing (5) circumferentially arranged on the periphery of the simulation impeller (2), a timing sensor arranged on the simulation casing (5) and used for sensing a time sequence simulating the arrival time sequence of the blade tip of the simulation blade (22) to obtain the vibration frequency of the simulation blade tip (22) and a second simulated blade tip vibration displacement (22) and a simulated blade tip vibration displacement analysis device electrically connected with the timing sensor and used for obtaining the second simulated blade tip vibration displacement (22) and simulating the vibration displacement of the blade tip (22) and the displacement A simulation analyzer of correspondence between blade (22) and blade body vibratory stresses.
2. The tip timing method rotor blade vibration test system evaluation device according to claim 1, wherein the dummy impeller (2) includes a connection shaft (21) connected to an output shaft of the dynamo-electric machine (1) and a plurality of dummy blades (22) arranged on the connection shaft (21) at intervals in a circumferential direction.
3. The tip timing rotor blade vibration test system evaluation device of claim 2, wherein the strain assembly (3) comprises a strain gauge (31) attached to the body of the dummy blade (22) and strain transmission leads (32) connected to the strain gauge (31) and the telemetry system (4), respectively.
4. The evaluation device of the rotor blade vibration test system according to claim 3, wherein the telemetry system (4) comprises a telemetry system transmitting end (41) arranged on the cantilever end of the connecting shaft (21) and connected with the strain transmission lead (32), a telemetry system receiving end in radio connection with the telemetry system transmitting end (41), and a telemetry system data processor electrically connected with the telemetry system receiving end and the first data processor, respectively.
5. The evaluation device of the rotor blade vibration test system according to claim 4, wherein the connecting shaft (21) is axially provided with a connecting cavity, the wall surface of the connecting shaft (21) is radially provided with a connecting hole (211) communicated with the connecting cavity, and the strain transmission lead (32) is inserted into the connecting hole (211) to be connected with the transmitting end (41) of the telemetry system.
6. The device for evaluating a rotor blade vibration test system according to claim 4, wherein the cantilever end of the connecting shaft (21) is provided with a first flange mounting edge, and the transmitting end (41) of the remote measuring system is provided with a second flange mounting edge which is connected with the first flange mounting edge.
7. A method for evaluating a tip timing method rotor blade vibration test system, which is characterized in that the evaluation is carried out by adopting the tip timing method rotor blade vibration test system evaluation device of any one of claims 1 to 6, and the method comprises the following steps:
s1, driving a simulation impeller (2) to rotate by working of a driving motor (1), and enabling a strong magnetic excitation piece to send out magnetic field excitation to enable simulation blades (22) on the simulation impeller (2) to resonate when rotating;
s2, strain signals simulating the blade body strain condition of the blade (22) are obtained through measurement of the strain assembly (3), the strain signals are transmitted into a first data processor through a remote measuring system (4), and the strain signals are processed through the first data processor to obtain the vibration frequency of the simulated blade (22) and the blade body vibration stress of the simulated blade (22); meanwhile, sensing a time sequence of the arrival time of the tip of the simulated blade (22) into a second data processor through a timing sensor, and processing the time sequence of the arrival time of the tip of the simulated blade (22) through the second data processor to obtain the vibration frequency of the simulated blade (22) and the vibration displacement of the tip of the simulated blade (22);
and S3, performing modal analysis on the simulated impeller (2) through a simulation analyzer to obtain the corresponding relation between the tip vibration displacement of the simulated blade (22) and the blade body vibration stress of the simulated blade (22) under the resonance rotating speed of the simulated blade (22), and then performing accuracy evaluation on the vibration frequency of the simulated blade (22) and the tip vibration displacement of the simulated blade (22) obtained by a second data processor according to the corresponding relation between the tip vibration displacement of the simulated blade (22) and the blade body vibration stress of the simulated blade (22) and the vibration frequency of the simulated blade (22) obtained by the first data processor and the blade body vibration stress of the simulated blade (22).
8. The tip timing method rotor blade vibration testing system evaluation method of claim 7, further comprising, before step S1, the steps of:
s0, determining the simulated impeller (2) according to the vertical distance from the center of the output shaft of the driving and rotating motor (1) to the base of the driving and rotating motor (1)The method comprises the steps of determining the width of a simulation blade (22) and the number of the simulation blade (22) according to the wind resistance influence generated by ambient air when the simulation blade (22) rotates and the power of a driving motor (1), and then obtaining the first-order modal frequency of the simulation blade (22) according to an empirical formula, wherein the empirical formula is F =810092H/I2Wherein F is frequency, H is thickness of the simulation blade (22), and I is length of the simulation blade (22).
9. The tip timing rotor blade vibration testing system evaluation method of claim 8, further comprising the step between S0 and S1 of:
modal analysis is carried out on the simulated impeller (2) through a simulation analyzer to obtain the first-order modal frequency of the simulated blade (22), so that the first-order modal frequency of the simulated blade (22) obtained according to an empirical formula is verified, and the feasibility of the structural dimension design scheme of the simulated impeller (2) is verified.
10. The tip timing rotor blade vibration testing system evaluation method of claim 8, further comprising the step between S0 and S1 of:
modal analysis is carried out on the simulated impeller (2) through a simulation analyzer, a first-order modal vibration stress distribution calculation result of the simulated blade (22) is obtained, the installation position of the strain assembly (3) is determined according to the first-order modal vibration stress distribution calculation result of the simulated blade (22), and then the strain assembly (3) is installed.
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