CN109932151B - Device and method for testing joint diameter movement of blisk under action of traveling wave excitation - Google Patents
Device and method for testing joint diameter movement of blisk under action of traveling wave excitation Download PDFInfo
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- CN109932151B CN109932151B CN201910243417.3A CN201910243417A CN109932151B CN 109932151 B CN109932151 B CN 109932151B CN 201910243417 A CN201910243417 A CN 201910243417A CN 109932151 B CN109932151 B CN 109932151B
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Abstract
A test method of blisk nodal diameter motion under the action of traveling wave excitation is realized on the basis of a blisk nodal diameter motion test device under the action of traveling wave excitation, wherein the test device comprises an industrial personal computer, an analog output board card, a board card case, a power amplifier, a non-contact magnetic field vibration exciter, a modal force hammer, an acceleration sensor, a data acquisition analyzer, an upper computer and a blisk, and modal vibration test is carried out on the blisk through the cooperation of the device; the control program of the traveling wave signal in the industrial control machine in the whole device is developed automatically, is flexible and controllable, the analog output board card and the board card case are efficiently integrated, the operation is simple, the vibration response data acquired by the acceleration sensor can also be used for researching the vibration response characteristic of the blisk in a resonance state, a non-contact magnetic field vibration exciter is adopted, and compared with a conventional flexible rod vibration exciter, the vibration exciter can not introduce additional mass and additional rigidity to a system, and the accuracy of the test is improved.
Description
Technical Field
The invention relates to the technical field of vibration testing, in particular to a method for testing the joint diameter movement of a blisk under the action of traveling wave excitation.
Background
The lightweight and the high-speed of aeroengine bladed disk structure for this kind of novel structure of blisk has obtained extensive application, compares with traditional joggle bladed disk, and the blade of blisk and rim plate are made integratively through advanced manufacturing process, disk body simple structure, and weight becomes light, and the performance is more superior.
The stress condition of the blisk is very complex when the blisk is in a rotating working state, so that the real excitation of the blisk is generally called traveling wave excitation, the traveling wave excitation is generally defined as the excitation of the rotor when the rotor rotates and pressure disturbance with equal intervals is carried out, the traveling wave excitation can be simulated by sequentially applying sinusoidal excitation with equal phase difference to each blade of the blisk in a laboratory, and meanwhile, the mode vibration form and pitch diameter motion rule of the blisk under the traveling wave excitation have important significance on the dynamic design and vibration suppression of the structural member.
At present, the method for identifying the mode shape of the blisk is mainly a method provided by an experimental mode analysis theory, namely, the mode shape is identified by testing the frequency response function of each response point, wherein, the excitation test by adopting a force hammer or an electromagnetic vibration exciter is the most commonly used method, however, because the blisk usually has dense natural frequency intervals and serious mode coupling, the traditional method for testing the mode shape has low test precision and unreliable results, and meanwhile, the mode test has higher requirements on the operation skills of experimenters, and in addition, the mode test experiment only can give a mode shape graph simply and cannot reflect the change rule of the pitch diameter.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a method for testing the joint diameter movement of a blisk under the action of traveling wave excitation, which can improve the identification precision and efficiency of modal shape testing, and adopts the technical scheme that:
a device for testing the pitch diameter motion of a blisk under the action of traveling wave excitation comprises an industrial personal computer, an analog output board card, a board card case, a power amplifier, a non-contact magnetic field vibration exciter, a modal force hammer, an acceleration sensor, a data acquisition analyzer, an upper computer and a blisk;
the ethernet output of industrial computer connects the ethernet input of integrated circuit board machine case, the slot of integrated circuit board machine case is arranged in to the simulation output board card, power amplifier's input is connected to the output of simulation output board card, power amplifier's output is connected the input of non-contact magnetic field vibration exciter, non-contact magnetic field vibration exciter fixed mounting is in blisk below, acceleration sensor pastes in the blade upper surface of blisk, data acquisition analyzer's input is connected to acceleration sensor's output, data acquisition analyzer's ethernet output connects the host computer, blisk top is arranged in to the modal power hammer, the impact end contact blisk upper surface of modal power hammer, data acquisition analyzer is connected to the automatically controlled input electricity of modal power hammer.
The industrial personal computer is internally provided with a LabVIEW program editor, and develops a program by itself to be used as a traveling wave signal generator to generate and control a traveling wave excitation signal.
The analog output board card and the board card case convert traveling wave excitation signals output by the industrial personal computer into analog signals to be output, and the analog signals output by the board card case are transmitted to the power amplifier.
The power amplifier amplifies an input analog signal into a high-voltage excitation signal, and the high-voltage excitation signal is loaded to the non-contact magnetic field vibration exciter.
The non-contact magnetic field vibration exciter generates an alternating magnetic field according to a high-voltage excitation signal, and the alternating magnetic field excites the blisk to generate steady-state vibration.
The modal force hammer is arranged above the blisk, and the modal force hammer hammers the blisk to perform modal testing.
The acceleration sensor is used for acquiring vibration response signals of the blisk.
The data acquisition analyzer is used for recording and analyzing vibration response signals of the blisk obtained by the acceleration sensor in real time.
The upper computer is used for processing vibration response signals of the blisk and identifying the modal vibration mode and pitch diameter motion law of the blisk.
The method for testing the pitch diameter motion of the blisk by adopting the device for testing the pitch diameter motion of the blisk under the action of traveling wave excitation comprises the following steps:
step 1: the industrial personal computer compiles a signal generator program so that the signal generator program can generate and control a multi-channel traveling wave excitation signal;
step 2: adjusting the power amplifier to enable the gains of all channels to be the same, and fixing the non-contact magnetic field vibration exciter below a blade tip measuring point of the blisk at a certain distance through a special clamp;
and step 3: setting excitation signal parameters of each channel in a signal generator program compiled by an industrial personal computer;
and 4, step 4: carrying out modal testing on the blisk to obtain inherent frequencies of each order of the blisk, then carrying out finite element modal analysis on the blisk by the upper computer, and correcting a finite element model according to a modal testing result until the modal testing result is matched with a modal analysis result;
and 5: determining a sweep frequency test range according to the inherent frequency value of each order of the blisk, and carrying out sweep frequency excitation test on the blisk to obtain the resonant frequency of each order of the blisk:
step 5.1: setting signal parameters and sweep frequency excitation parameters of each channel in a signal generator of an industrial personal computer;
step 5.2: starting a power amplifier and a non-contact magnetic field vibration exciter to carry out frequency sweep excitation test on the blisk;
step 5.3: the acceleration sensor collects vibration response signals of the blisk in real time and outputs the vibration response signals to the data acquisition analyzer;
step 5.4: the data acquisition analyzer records and processes the vibration response signal of the blisk in real time and outputs the vibration response signal to the upper computer;
step 5.5: the upper computer acquires the resonant frequency of each order of the blisk according to the vibration response signal of the blisk;
step 6: and (5) carrying out fixed-frequency order excitation test on the blisk according to each order resonance frequency of the blisk obtained in the step 5:
step 6.1: setting excitation signal parameters of each channel in a signal generator of an industrial personal computer, and setting phase differences among the excitation signals according to excitation orders;
step 6.2: starting a power amplifier and a non-contact magnetic field vibration exciter to carry out fixed-frequency excitation on the blisk so as to enable the blisk to be in a stable vibration state;
step 6.3: numbering the blades, starting testing from two measuring points of the blade tips of No. 1 and No. 2 blades, sequentially testing for 12 times according to the blade numbers, completing the vibration response test of a circle of measuring points, and simultaneously obtaining vibration response signals of a circle of measuring points of the blisk by the acceleration sensor and uploading the vibration response signals to an upper computer through a data acquisition analyzer;
step 6.4: the two acceleration sensors are moved inwards in the radial direction, so that the vibration response signals of the multi-circumference measuring points are picked up, and meanwhile, the acceleration sensors obtain the vibration response signals of the multi-circumference measuring points of the blisk and transmit the vibration response signals to the upper computer in real time through the data acquisition analyzer;
step 6.5: changing the excitation order, repeating the step 6.1 to the step 6.4, and finishing the picking of vibration response signals of the multiple circumferential measuring points of the blisk under the excitation of a plurality of traveling waves;
and 7: according to vibration response data of multiple circumferential measuring points on the surface of the blisk, the upper computer draws a modal vibration mode of the blisk under the action of traveling wave excitation and identifies a pitch diameter motion rule;
step 7.1: the upper computer performs time domain response signal noise reduction processing and windowing processing on the vibration response data of the multiple circumferential measuring points on the surface of the blisk;
step 7.2: the upper computer extracts the data subjected to the noise reduction processing of the time domain response signal;
step 7.3: drawing a line frame model of the measuring points of the blisk by an upper computer according to the size parameters, the number of the measuring points and the arrangement condition of the measuring points of the blisk;
step 7.4: and the upper computer loads the vibration response data of each measuring point to the measuring point coordinates of the corresponding wire frame model, draws the modal shape of the blisk, and identifies the pitch diameter motion rule by comparing the pitch diameter change of the modal shape.
Compared with the prior art, the invention has the beneficial effects that:
(1) the traveling wave signal control program in the industrial personal computer is developed automatically, is flexible and controllable, and is simple to operate, and the analog output board card and the board card case are efficiently integrated;
(2) the vibration response data acquired by the acceleration sensor can also be used for researching the vibration response characteristic of the blisk in a resonance state;
(3) compared with the conventional flexible rod vibration exciter, the non-contact magnetic field vibration exciter does not introduce additional mass and additional rigidity to the system, and the testing accuracy is improved.
Drawings
FIG. 1 is a block diagram of electrical signal connections under the action of traveling wave excitation in accordance with one embodiment of the present invention;
FIG. 2 is a schematic diagram of the apparatus for testing the joint diameter movement of a blisk under the action of traveling wave excitation according to an embodiment of the present invention;
FIG. 3 is a flow chart of a blisk pitch diameter movement test under the action of traveling wave excitation according to an embodiment of the present invention;
FIG. 4 is a graphical representation of blisk modal shape through finite element analysis under traveling wave excitation in accordance with an embodiment of the present invention;
FIG. 5 is a front panel of a signal generator under traveling wave excitation in accordance with one embodiment of the present invention;
FIG. 6 is a block diagram of a first portion of a signal generator operating under traveling wave excitation in accordance with one embodiment of the present invention;
FIG. 7 is a block diagram of a second part of the engineering process of a signal generator under the action of traveling wave excitation according to an embodiment of the present invention;
FIG. 8 is a block diagram of a third part of the engineering process of a signal generator under the action of traveling wave excitation according to an embodiment of the present invention;
FIG. 9 is a three-dimensional waterfall plot of a zero-order fixed-frequency excitation blisk with 192Hz as the excitation frequency according to an embodiment of the present invention;
FIG. 10 is a time domain signal diagram of zero order constant frequency excitation of a blisk with 192Hz as the excitation frequency according to an embodiment of the present invention;
fig. 11 is a modal shape diagram obtained by a test of zero-order constant frequency excitation of a blisk with 192Hz as an excitation frequency according to an embodiment of the present invention.
In the figure: 1. the device comprises an upper computer, a data acquisition analyzer, a power amplifier, a simulation output board card, a data acquisition analyzer, a blisk, a data acquisition analyzer, a power amplifier, a data acquisition analyzer, a simulation output board card, a data acquisition analyzer, a power amplifier.
Detailed Description
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In the embodiment, a blisk is taken as an implementation object, and the size parameters are shown in table 1:
TABLE 1 blisk size parameter (unit: m)
As shown in fig. 1 to 11, the invention provides a device for testing the pitch diameter motion of a blisk under the action of traveling wave excitation, which comprises an industrial personal computer 3, an analog output board card 6, a board card case 7, a power amplifier 5, a non-contact magnetic field exciter 8, a modal hammer 10, an acceleration sensor 9, a data acquisition analyzer 2 and an upper computer 1, wherein the industrial personal computer 3 adopts a high-performance notebook computer, the analog output board card 6 adopts an NI-9263 output board card which is a synchronous updating analog output module, the board card case 7 adopts an NIcDAQ-9189 case which is a bus power supply ethernet case designed for a small sensor measurement system, the board card is directly inserted into the case to form the analog output module in the use process, the power amplifier 5 adopts a YE5876 power amplifier which is connected with the non-contact magnetic field exciter 8 and the analog output board card 6 through a BNC input-output interface, the maximum power is 800W, 12 paths of input and output channels are shared, stable signal gain can be provided, the non-contact magnetic field vibration exciter 8 is a YE15401 non-contact magnetic field vibration exciter, the maximum peak value exciting force is 20N, non-contact vibration excitation is carried out on the blisk 4 in the mode of applying magnetic field force, the modal force hammer 10 is a PCB 086D05 impact force hammer, the test range is 1 Hz-22 kHz, the sensitivity is 0.23mV/N, and is used for carrying out modal test on the blisk 4 by adopting a hammering method, and the acceleration sensor 9 is a B type&The K4517 acceleration sensor is connected with the data acquisition analyzer 2 through a cable with UNF, and has the sensitivity of 1.02 mV/m.s-2The device is arranged on a tested piece through an adhesive, the testing frequency range is 1 Hz-20 kHz, the mass is only 0.65 g, and the device hardly influences the testing result, the data acquisition analyzer 2 adopts a data acquisition analyzer 2 with the model of LMS SCADAS Mobile Front-End, the data acquisition analyzer 2 is connected with an upper computer 1 through an Ethernet cable, 16 data acquisition channels are used for 24-bit A/D conversion, a standard ICP modulation input sensor and an analog voltage input sensor can be used, the upper computer 1 adopts a high-performance notebook computer, and finite element analysis software and data processing software are arranged in the high-performance notebook computer;
the Ethernet output end of the industrial personal computer 3 is connected with the Ethernet input end of the board card case 7 to transmit the generated traveling wave excitation signal, the analog output board card 6 is arranged in a slot of the board card case 7 to fixedly install the analog output board card 6, the input traveling wave excitation signal is subjected to analog processing through the analog output board card 6, the output end of the analog output board card 6 is connected with the input end of the power amplifier 5 to lead out the analog signal to the power amplifier 5, the output end of the power amplifier 5 is connected with the input end of the non-contact magnetic field exciter 8, the power amplifier 5 amplifies the input analog signal to ensure that the non-contact magnetic field exciter 8 generates enough alternating magnetic field, the non-contact magnetic field exciter 8 is fixedly arranged below the blisk 4, and the non-contact magnetic field exciter is close to the blade tip of the blisk 4, the utility model discloses a vibration test device, including four modes force hammer 10, acceleration sensor 9, data collection analyzer 2, modal force hammer 10, integral bladed disk 4, modal force hammer 10, the impact end contact integral bladed disk 4 upper surface of modal force hammer 10, data collection analyzer 2 is connected to the automatically controlled input electricity of modal force hammer 10, carries out the modal test to the acceleration of the vibration place of origin of blade detection to signal conduction to data acquisition analyzer 2 that will detect, the input of acceleration sensor 9's output connection data acquisition analyzer 2, gathers and the analysis the signal of input, host computer 1 is connected to the ethernet output of data acquisition analyzer 2, carries out the integration processing with the data after the analysis, integral bladed disk 4 top is arranged in to modal force hammer 9's output, the impact end contact integral bladed disk 4 upper surface of modal force.
The industrial personal computer 3 is internally provided with a LabVIEW program editor which is a basis for compiling the traveling wave signal generator, and the industrial personal computer 3 automatically develops a program to be used as the traveling wave signal generator to generate and control a traveling wave excitation signal.
The analog output board card 6 and the board card case 7 convert the traveling wave excitation signal output by the industrial personal computer 3 into an analog signal to be output, and the analog signal output by the board card case 7 is transmitted to the power amplifier 5.
The power amplifier 5 amplifies the input analog signal into a high-voltage excitation signal, and the high-voltage excitation signal is loaded to the non-contact magnetic field vibration exciter 8.
The non-contact magnetic field vibration exciter 8 generates an alternating magnetic field according to the high-voltage excitation signal, and the alternating magnetic field excites the blisk 4 to generate steady-state vibration.
The modal force hammer 10 is arranged above the blisk 4, and the modal force hammer 10 hammers the blisk 4 to perform modal testing.
The acceleration sensor 9 is used for acquiring a vibration response signal of the blisk 4.
The data acquisition analyzer 2 is used for recording and analyzing vibration response signals of the blisk 4 acquired by the acceleration sensor 9 in real time.
The upper computer 1 is used for processing a vibration response signal of the blisk 4 and identifying the modal shape and pitch diameter motion law of the blisk 4.
The method for testing the pitch diameter motion of the blisk 4 by adopting the blisk pitch diameter motion testing device under the action of traveling wave excitation comprises the following steps:
step 1: the industrial personal computer 3 compiles a signal generator program to enable the signal generator program to generate and control a multi-channel traveling wave excitation signal;
step 2: adjusting the power amplifier 5 to ensure that the gains of all channels are the same, and fixing the non-contact magnetic field vibration exciter 8 below a blade tip measuring point of the blisk 4 by a certain distance through a special clamp;
and step 3: setting excitation signal parameters of each channel in a signal generator program compiled by an industrial personal computer 3;
and 4, step 4: carrying out modal testing on the blisk 4 to obtain each order of natural frequency of the blisk 4, then carrying out finite element modal analysis on the blisk 4 by the upper computer 1, and correcting a finite element model according to a modal testing result until the modal testing result is matched with a modal analysis result;
and 5: determining a sweep frequency test range according to the inherent frequency value of each order of the blisk 4, and carrying out sweep frequency excitation test on the blisk 4 to obtain the resonant frequency of each order of the blisk 4:
step 5.1: setting signal parameters of each channel and sweep frequency excitation parameters in a signal generator of an industrial personal computer 3;
step 5.2: starting a power amplifier 5 and a non-contact magnetic field vibration exciter 8 to carry out frequency sweep excitation test on the integral blade disc 4;
step 5.3: the acceleration sensor 9 collects the vibration response signal of the blisk 4 in real time and outputs the vibration response signal to the data acquisition analyzer 2;
step 5.4: the data acquisition analyzer 2 records and processes the vibration response signal of the blisk 4 in real time and outputs the vibration response signal to the upper computer 1;
step 5.5: the upper computer 1 acquires the resonant frequency of each order of the blisk 4 according to the vibration response signal of the blisk 4;
step 6: and (5) performing fixed-frequency order excitation test on the blisk 4 according to the resonant frequency of each order of the blisk 4 obtained in the step 5:
step 6.1: setting excitation signal parameters of each channel in a signal generator of the industrial personal computer 3, and setting phase differences among the excitation signals according to excitation orders;
step 6.2: starting a power amplifier 5 and a non-contact magnetic field vibration exciter 8 to carry out fixed-frequency excitation on the integral blade disc 4 so as to enable the integral blade disc to be in a steady-state vibration state;
step 6.3: numbering the blades, starting testing from two measuring points of the blade tips of No. 1 and No. 2 blades, sequentially testing for 12 times according to the blade numbers to finish the vibration response test of a circle of measuring points, and simultaneously obtaining vibration response signals of a circle of measuring points of the blisk 4 by the acceleration sensor 9 and uploading the vibration response signals to the upper computer 1 through the data acquisition analyzer 2;
step 6.4: the two acceleration sensors 9 are moved inwards in the radial direction, so that the vibration response signals of the multiple circumferential measuring points are picked up, and meanwhile, the acceleration sensors 9 obtain the vibration response signals of the multiple circumferential measuring points of the blisk 4 and transmit the vibration response signals to the upper computer 1 in real time through the data acquisition analyzer 2;
step 6.5: changing the excitation order, repeating the step 6.1 to the step 6.4, and finishing the picking of vibration response signals of multiple circumferential measuring points of the blisk 4 under the excitation of a plurality of traveling waves;
and 7: according to vibration response data of a plurality of circumferential measuring points on the surface of the blisk 4, the upper computer 1 draws a modal shape of the blisk 4 under the action of traveling wave excitation and identifies a pitch diameter motion rule;
step 7.1: the upper computer 1 performs time domain response signal noise reduction processing and windowing processing on the vibration response data of the multiple circumferential measuring points on the surface of the integral blisk 4;
step 7.2: the upper computer 1 extracts the data subjected to the time domain response signal denoising processing;
step 7.3: according to the size parameters, the measuring point number and the measuring point arrangement condition of the blisk 4, the upper computer 1 draws a line frame model of the measuring points of the blisk 4;
step 7.4: the upper computer 1 loads vibration response data of each measuring point to the corresponding measuring point coordinates of the wire frame model, the modal shape of the blisk 4 is drawn, and the pitch diameter motion rule is identified by comparing the change of the pitch diameter of the modal shape.
The above examples are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above examples, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (9)
1. A method for testing the pitch diameter motion of a blisk under the action of traveling wave excitation is realized on the basis of a device for testing the pitch diameter motion of the blisk under the action of traveling wave excitation, wherein the device for testing the pitch diameter motion of the blisk comprises an industrial personal computer, an analog output board card, a board card case, a power amplifier, a non-contact magnetic field vibration exciter, a modal force hammer, an acceleration sensor, a data acquisition analyzer, an upper computer and a blisk;
the device is characterized in that the Ethernet output end of the industrial personal computer is connected with the Ethernet input end of the board card case, the analog output board is arranged in a slot of the board card case, the output end of the analog output board is connected with the input end of the power amplifier, the output end of the power amplifier is connected with the input end of the non-contact magnetic field exciter, the non-contact magnetic field exciter is fixedly arranged below the blisk, the acceleration sensor is adhered to the upper surface of the blade of the blisk, the output end of the acceleration sensor is connected with the input end of the data acquisition analyzer, the Ethernet output end of the data acquisition analyzer is connected with the upper computer, the modal force hammer is arranged above the inner ring of the blisk, the impact end of the modal force hammer is contacted with the upper surface of the blisk, the electric control input end of the modal force hammer is,
the test method comprises the following steps:
step 1: the industrial personal computer compiles a signal generator program so that the signal generator program can generate and control a multi-channel traveling wave excitation signal;
step 2: adjusting the power amplifier to enable the gains of all channels to be the same, and fixing the non-contact magnetic field vibration exciter below a blade tip measuring point of the blisk at a certain distance through a special clamp;
and step 3: setting excitation signal parameters of each channel in a signal generator program compiled by an industrial personal computer;
and 4, step 4: carrying out modal testing on the blisk to obtain inherent frequencies of each order of the blisk, then carrying out finite element modal analysis on the blisk by the upper computer, and correcting a finite element model according to a modal testing result until the modal testing result is matched with a modal analysis result;
and 5: determining a sweep frequency test range according to the inherent frequency value of each order of the blisk, and carrying out sweep frequency excitation test on the blisk to obtain the resonant frequency of each order of the blisk:
step 5.1: setting signal parameters and sweep frequency excitation parameters of each channel in a signal generator of an industrial personal computer;
step 5.2: starting a power amplifier and a non-contact magnetic field vibration exciter to carry out frequency sweep excitation test on the blisk;
step 5.3: the acceleration sensor collects vibration response signals of the blisk in real time and outputs the vibration response signals to the data acquisition analyzer;
step 5.4: the data acquisition analyzer records and processes the vibration response signal of the blisk in real time and outputs the vibration response signal to the upper computer;
step 5.5: the upper computer acquires the resonant frequency of each order of the blisk according to the vibration response signal of the blisk;
step 6: and (5) carrying out fixed-frequency order excitation test on the blisk according to each order resonance frequency of the blisk obtained in the step 5:
step 6.1: setting excitation signal parameters of each channel in a signal generator of an industrial personal computer, and setting phase differences among the excitation signals according to excitation orders;
step 6.2: starting a power amplifier and a non-contact magnetic field vibration exciter to carry out fixed-frequency excitation on the blisk so as to enable the blisk to be in a stable vibration state;
step 6.3: numbering the blades, starting testing from two measuring points of the blade tips of No. 1 and No. 2 blades, sequentially testing for 12 times according to the blade numbers, completing the vibration response test of a circle of measuring points, and simultaneously obtaining vibration response signals of a circle of measuring points of the blisk by the acceleration sensor and uploading the vibration response signals to an upper computer through a data acquisition analyzer;
step 6.4: the two acceleration sensors are moved inwards in the radial direction, so that the vibration response signals of the multi-circumference measuring points are picked up, and meanwhile, the acceleration sensors obtain the vibration response signals of the multi-circumference measuring points of the blisk and transmit the vibration response signals to the upper computer in real time through the data acquisition analyzer;
step 6.5: changing the excitation order, repeating the step 6.1 to the step 6.4, and finishing the picking of vibration response signals of the multiple circumferential measuring points of the blisk under the excitation of a plurality of traveling waves;
and 7: according to vibration response data of multiple circumferential measuring points on the surface of the blisk, the upper computer draws a modal vibration mode of the blisk under the action of traveling wave excitation and identifies a pitch diameter motion rule;
step 7.1: the upper computer performs time domain response signal noise reduction processing and windowing processing on the vibration response data of the multiple circumferential measuring points on the surface of the blisk;
step 7.2: the upper computer extracts the data subjected to the noise reduction processing of the time domain response signal;
step 7.3: drawing a line frame model of the measuring points of the blisk by an upper computer according to the size parameters, the number of the measuring points and the arrangement condition of the measuring points of the blisk;
step 7.4: and the upper computer loads the vibration response data of each measuring point to the measuring point coordinates of the corresponding wire frame model, draws the modal shape of the blisk, and identifies the pitch diameter motion rule by comparing the pitch diameter change of the modal shape.
2. The method for testing the pitch diameter motion of the blisk under the action of traveling wave excitation according to claim 1, wherein a LabVIEW program editor is arranged in the industrial personal computer, and a self-developed program of the industrial personal computer is used as a traveling wave signal generator to generate and control traveling wave excitation signals.
3. The method for testing the pitch diameter motion of the blisk under the action of traveling wave excitation according to claim 1, wherein traveling wave excitation signals output by the industrial personal computer are converted into analog signals by the analog output board card and the board card case and output, and the analog signals output by the board card case are transmitted to the power amplifier.
4. The method for testing the pitch diameter motion of the blisk under the action of traveling wave excitation according to claim 1, wherein the power amplifier amplifies an input analog signal into a high-voltage excitation signal, and the high-voltage excitation signal is loaded to a non-contact magnetic field exciter.
5. The method for testing the nodal diameter motion of the blisk under the action of traveling wave excitation according to claim 1, wherein the non-contact magnetic field exciter generates an alternating magnetic field according to a high-voltage excitation signal, and the alternating magnetic field excites the blisk to generate steady-state vibration.
6. The method for testing the pitch diameter motion of the blisk under the action of traveling wave excitation according to claim 1, wherein the modal force hammer is arranged above the blisk, and the modal force hammer hammers the blisk to perform modal testing.
7. The method for testing the pitch diameter motion of the blisk under the action of traveling wave excitation according to claim 1, wherein the acceleration sensor is used for acquiring a vibration response signal of the blisk.
8. The method for testing the pitch diameter motion of the blisk under the action of traveling wave excitation according to claim 1, wherein the data acquisition analyzer is used for recording and analyzing vibration response signals of the blisk obtained by the acceleration sensor in real time.
9. The method for testing the nodal diameter motion of the blisk under the action of traveling wave excitation according to claim 1, wherein the upper computer is used for processing a vibration response signal of the blisk and identifying the modal shape and the nodal diameter motion law of the blisk.
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| CN203479487U (en) * | 2013-07-31 | 2014-03-12 | 沈阳工程学院 | Experiment device for testing vibration modes of steam turbine simulated impeller |
| CN103528667B (en) * | 2013-10-23 | 2015-05-20 | 东北大学 | Laser scanning based cylindrical shell modal shape testing device and method |
| CN104458176A (en) * | 2014-12-15 | 2015-03-25 | 中国飞机强度研究所 | Noise and vibration combined test device for blade of rotor |
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| CN106596011A (en) * | 2016-11-21 | 2017-04-26 | 中国船舶重工集团公司第七0五研究所 | Small impeller mode testing method based on exciting point optimization and vibration measurement with laser |
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| CN107991080A (en) * | 2017-12-05 | 2018-05-04 | 中国人民解放军总参谋部第六十研究所 | A kind of high frequency Modal Analysis on Blade method based on non-contact vibration measuring and simulation calculation |
| CN108760020A (en) * | 2018-06-01 | 2018-11-06 | 东北大学 | Fiber composite thin plate Non-Linear Vibration characterization test method based on vibration measurement with laser |
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| CN101561342A (en) * | 2009-05-15 | 2009-10-21 | 北京工业大学 | System and method for measuring time-sharing quick steady-state sine sweep excitation frequency response function |
| CN109359392A (en) * | 2018-10-19 | 2019-02-19 | 北京化工大学 | A kind of turbo blade Stress Calculation method using non-cpntact measurement |
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