CN107655429B - Method and device for measuring vibration displacement of blade - Google Patents
Method and device for measuring vibration displacement of blade Download PDFInfo
- Publication number
- CN107655429B CN107655429B CN201610635337.9A CN201610635337A CN107655429B CN 107655429 B CN107655429 B CN 107655429B CN 201610635337 A CN201610635337 A CN 201610635337A CN 107655429 B CN107655429 B CN 107655429B
- Authority
- CN
- China
- Prior art keywords
- blade
- signal
- engine rotor
- rotation
- starting point
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B15/00—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
Abstract
The invention relates to the technical field of vibration measurement of rotating blades, in particular to a method and a device for measuring vibration displacement of a blade. A method of measuring vibratory displacement of a blade, comprising: acquiring the moment when the blade tip of each blade of the engine rotor passes through the microwave sensor; acquiring the moment of the starting point of each rotation of the engine rotor; calculating the rotating arc length of the starting point of each rotation of the engine rotor according to the moment when the blade tip of any blade passes through the microwave sensor, the moment of the starting point of each rotation of the engine rotor and the rotating speed of the engine rotor; and calculating the vibration displacement of the blade according to the rotating arc length of the starting point of each rotation of the engine rotor and the arc length between the balance point position of the blade tip and the microwave sensor when the engine rotor is positioned at the starting point.
Description
Technical Field
the invention relates to the technical field of vibration measurement of rotating blades, in particular to a method and a device for measuring vibration displacement of a blade.
background
At present, the method for measuring the blade vibration parameters is mainly a non-contact measuring method. In the non-contact measurement method, the measurement of the blade vibration displacement is the basis of the measurement of the blade vibration parameter.
in the prior art, non-contact blade vibration measurement methods mainly include a capacitance method, a laser method, an optical fiber method, an eddy current method and the like. When the engine is in a normal working state, the engine has the characteristics of high internal temperature, high pressure, high pollution, high air flow speed, high blade rotating speed, large blade length change, irregular blade shape and the like. The capacitance method has the characteristics of incapability of resisting high temperature, low high-speed rotation response speed, small required blade tip clearance and the like; the laser method and the optical fiber method have the characteristics of no high temperature resistance, strict requirements on the shape, the surface characteristics and the like of the blade, poor pollution resistance and the like; the eddy current method has the characteristics of being incapable of resisting high temperature, low in high-speed rotation response speed, strict in requirements on blade shape and clearance and the like, so that the blade vibration measurement method has certain errors and cannot accurately measure blade vibration displacement.
Disclosure of Invention
the embodiment of the invention provides a method and a device for measuring blade vibration displacement, which can accurately measure the blade vibration displacement.
In order to achieve the purpose, the invention adopts the following technical scheme:
according to an aspect of the present invention, there is provided a method of measuring a vibratory displacement of a blade, comprising: acquiring the moment when the blade tip of each blade of the engine rotor passes through the microwave sensor; acquiring the moment of the starting point of each rotation of the engine rotor; calculating the rotating arc length of the starting point of each rotation of the engine rotor according to the moment when the blade tip of any blade passes through the microwave sensor, the moment of the starting point of each rotation of the engine rotor and the rotating speed of the engine rotor; and calculating the vibration displacement of the blade according to the rotating arc length of the starting point of each rotation of the engine rotor and the arc length between the balance point position of the blade tip and the microwave sensor when the engine rotor is positioned at the starting point.
According to an aspect of the invention, the method of measuring the vibratory displacement of the blade further comprises: acquiring a reflected signal which is transmitted by the microwave sensor and reflected by the blade by using the microwave sensor; directly receiving a microwave signal transmitted by a microwave sensor as a reference signal; and calculating the moment when the blade tip of each blade passes through the microwave sensor according to the reflection signal and the reference signal.
According to an aspect of the invention, the method of measuring the vibratory displacement of the blade further comprises: acquiring a phase curve and an amplitude curve according to the reference signal and the reflection signal; and analyzing the moment when the blade tip of each blade passes through the microwave sensor according to the phase curve and the amplitude curve.
According to an aspect of the invention, the method of measuring the vibratory displacement of the blade further comprises: respectively converting the reflection signals into low-frequency reflection signals and low-frequency reflection signals delayed by 90-degree phases; converting the reference signal into a low-frequency reference signal; and inputting the low-frequency reflection signal, the low-frequency reference signal and the low-frequency reflection signal with the phase delayed by 90 degrees into a microwave signal demodulation system to calculate a phase curve and an amplitude curve.
According to an aspect of the invention, the method of measuring the vibratory displacement of the blade further comprises: acquiring a starting point signal of each rotation of an engine rotor through an indicating sensor; and calculating the moment of the starting point of each rotation of the engine rotor according to the starting point signal of each rotation of the engine rotor.
According to one aspect of the invention, the moment when the tip of each blade passes the microwave sensor and the moment when the starting point of each revolution of the engine rotor are measured separately by the maximum method.
according to one aspect of the invention, the arc length between the position of the balance point of the blade tip and the microwave sensor when the engine rotor is at the starting point is obtained by a calibration method or by direct measurement.
according to another aspect of the present invention, there is provided a blade vibration displacement measuring apparatus comprising: the blade tip passing time acquiring device is configured to acquire the time when the blade tip of each blade of the engine rotor passes through the microwave sensor; a start timing obtaining device configured to obtain a timing of a start point per rotation of the engine rotor; the processing unit can calculate the rotating arc length of the starting point of each rotation of the engine rotor according to the moment when the blade tip of the blade passes through the microwave sensor and the moment when the starting point of each rotation of the engine rotor; and the vibration displacement of the blade can be calculated according to the rotation arc length of the starting point of each rotation of the engine rotor and the arc length between the balance point position of the blade tip and the microwave sensor when the engine rotor is positioned at the starting point.
According to another aspect of the present invention, the blade tip passing timing acquiring device includes: a microwave sensor configured to transmit a microwave signal and receive a reflected signal reflected by a blade of an engine rotor; the microwave signal demodulation system is configured to directly receive the microwave signal transmitted by the microwave sensor and serve as a reference signal, collect the reflected signal and acquire a phase curve and an amplitude curve according to the reference signal and the reflected signal, and the demodulation signal source is configured to provide a demodulation signal by the microwave signal demodulation system.
According to another aspect of the present invention, a microwave signal demodulation system includes: a first down converter for processing the reflected signal into a low frequency reflected signal; the phase shifter is used for delaying the low-frequency reflection signal by 90 degrees of phase to obtain a low-frequency reflection signal delayed by 90 degrees of phase; the second down converter is used for processing the reference signal into a low-frequency reference signal; and the I/Q demodulator is used for calculating a phase curve and an amplitude curve according to the low-frequency reflection signal, the low-frequency reference signal and the low-frequency reflection signal delayed by 90 degrees of phase.
According to another aspect of the present invention, the start timing obtaining means includes: the starting mechanism is fixed on the engine rotor and used as a rotation starting point of the engine rotor; and the indicating sensor is used for acquiring a starting point signal of each rotation of the engine rotor by acquiring the signal of the starting mechanism.
By adopting the method and the device for measuring the vibration displacement of the blade, the actual rotating arc length of the blade is calculated according to the moment when the blade passes through the microwave sensor and the moment of the starting point of each rotation of the rotor of the engine, and then the vibration displacement of the blade is calculated according to the actual rotating arc length and the rotating arc length of the position of the balance point of the blade. Because the embodiment of the invention takes the moment of the starting point of each rotation as the absolute reference point, the problem that the blade vibration displacement cannot be accurately measured in the prior art can be solved. And because the testing device does not need to be in contact with the rotor of the engine, the vibration displacement of the blade can be accurately tested in real time under the condition that the engine normally works, and the testing device is not influenced by the complex environment in the engine, the shape of the blade, the surface characteristic of the blade, the high-speed rotation of the blade and the like.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart illustrating a measurement method according to one embodiment of the present invention;
FIG. 2 is a graph illustrating waveforms of signals collected by a measurement method according to an embodiment of the present invention;
FIG. 3 is a signal waveform diagram showing the microwave sensor signal shown in FIG. 2 after removal of the DC offset of the waveform;
FIG. 4 is a schematic view showing a mounting structure of a sensor according to an embodiment of the present invention;
FIG. 5 is a schematic view showing the embodiment shown in FIG. 4 with the engine rotor rotating;
FIG. 6 is a schematic diagram showing the structure of a measuring apparatus according to an embodiment of the present invention;
Fig. 7 is a schematic diagram showing the structure of the microwave signal demodulating system in the embodiment shown in fig. 6.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. In the drawings, the thickness of regions and layers may be exaggerated for clarity. The same reference numerals denote the same or similar structures in the drawings, and thus detailed descriptions thereof will be omitted.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1 shows a flow chart of a measurement method according to an embodiment of the invention. Fig. 2 is a method for measuring blade vibration displacement according to the embodiment of fig. 1, which is a waveform diagram of signals collected by the measuring method according to the embodiment of the invention, and comprises the following steps:
S1, acquiring the time when the blade tip of each blade of the engine rotor passes through the microwave sensor, and accurately extracting the position information of the blade tip of the blade of the engine rotor in a rotating state according to the received microwave signal;
and S2, acquiring the moment of the starting point of each rotation of the engine rotor, and obtaining the difference value of the starting point moments of two adjacent rotations, namely T shown in figure 2 according to the moment of the starting point of each rotation, wherein T is the time of each rotation of the engine rotor. The moment of the starting point of each rotation of the engine rotor is used as an absolute reference point; according to the moment of the starting point of each rotation of the engine rotor and the moment of the blade tip of the first blade passing through the microwave sensor in the rotation of the engine rotor passing through the microwave sensor, the rotation time of the first blade passing through the microwave sensor in the rotation of the engine rotor, namely t1 shown in fig. 2, can be obtained;
S3, calculating the rotation arc length of the starting point of each rotation of the engine rotor according to the moment when the blade tip of any blade passes through the microwave sensor, the moment of the starting point of each rotation of the engine rotor and the rotation speed of the engine rotor;
And S4, calculating the vibration displacement of the blade according to the rotation arc length of the starting point of each rotation of the engine rotor and the arc length between the balance point position of the blade tip and the microwave sensor when the engine rotor is positioned at the starting point. When the rotor is located at the initial point, the arc length between the blade tip balance point position and the microwave sensor is the arc length between the blade tip balance point position and the microwave sensor when the indication sensor is over against the initial point of the rotor, and the rotating arc length is a fixed arc length and cannot change along with the vibration of the blade.
According to an embodiment of the present invention, the method for acquiring the time when the blade tip of each blade of the engine rotor passes through the microwave sensor in step S1 includes:
S11, acquiring a reflected signal which is transmitted by the microwave sensor and reflected by the blade by the microwave sensor;
S12, directly receiving the microwave signal transmitted by the microwave sensor as a reference signal;
And S13, calculating the moment when the blade tip of each blade passes through the microwave sensor according to the reflection signal and the reference signal.
Specifically, the method for calculating the time when each blade passes through the microwave sensor includes acquiring a phase curve and an amplitude curve according to the reference signal and the reflected signal, and analyzing the time when the blade tip of each blade passes through the microwave sensor according to the phase curve and the amplitude curve.
According to an embodiment of the invention, a method of acquiring a phase curve and an amplitude curve comprises: down-converting the reflected signal and the demodulated signal into a low-frequency reflected signal, and delaying the phase by 90 degrees to obtain a low-frequency reflected signal delayed by the phase by 90 degrees; down-converting the reference signal and the demodulated signal into a low-frequency reference signal; and inputting the low-frequency reflection signal, the low-frequency reference signal and the low-frequency reflection signal delayed by 90 degrees of phase into a microwave signal demodulation system to calculate the phase curve and the amplitude curve.
according to the embodiment of the invention, the blade information can be identified by analyzing the phase curve and the amplitude curve after microwave signal demodulation, namely, by analyzing the low-frequency reflection signal, the low-frequency reference signal and the low-frequency reflection signal delayed by 90 degrees.
when the blade is identified by adopting the amplitude mode of the microwave signal, when the blade passes through the microwave sensor, the reflected energy received by the microwave sensor is relatively large, and a wave peak is formed on the waveform of the amplitude signal. When the blade is identified by adopting the phase mode of the microwave signal, when the blade passes through the microwave sensor, the phase of the signal received by the microwave sensor is increased or decreased, and a wave crest or a wave trough is formed on the waveform of the signal. Wherein, whether the blade is in the wave crest or the wave trough of the signal when reaching the microwave sensor can be automatically identified by software. The specific method comprises the following steps: the average, maximum and minimum values of the entire data are calculated first. If the deviation of the maximum value and the mean value is greater than the deviation of the minimum value and the mean value, the blade is at the peak of the signal when it reaches the microwave sensor. Otherwise, the blade is in the wave trough of the signal when reaching the microwave sensor.
according to an embodiment of the present invention, the method for acquiring the time of each rotation starting point of the rotor of the engine in the step S2 includes:
S21, acquiring a starting point signal of each rotation of the engine rotor through an indicating sensor;
And S22, calculating the time of the starting point of each rotation of the engine rotor according to the starting point signal of each rotation of the engine rotor.
According to an embodiment of the present invention, the time of the microwave sensor may be calculated by a maximum value method. In one embodiment, when it is identified that the tip of the blade is at the peak of the signal past the microwave sensor, the time at which each blade passes the microwave sensor may be measured using a maximum method. The specific method comprises the following steps: firstly, according to a certain proportionality coefficient, the maximum value of the whole section of waveform is multiplied by the proportionality coefficient to obtain the threshold value of the waveform, then the point of the maximum value of each small section of waveform of which the signal is greater than the threshold value is searched, and the time corresponding to the maximum value is the time when the blade reaches the microwave sensor. For example, the average value of the entire waveform is subtracted from each point in the entire waveform, i.e., the dc offset of the waveform is removed, so as to obtain the waveform shown in fig. 3. And calculating the maximum value v1 of the whole waveform, taking a certain proportionality coefficient k, generally taking 0.8, and multiplying the maximum value v1 by the proportionality coefficient k to obtain a threshold value v 2. Intercepting each small segment of waveform with the numerical value larger than a threshold value v2, and calculating the maximum value time of each small segment of waveform to be t 1-t4. and each time t 1-t 4, namely the time when each blade reaches the microwave sensor. In another embodiment, when it is identified that the blade reaches the trough of the signal when the microwave sensor is located, the entire waveform curve is inverted to be the peak signal, and then the time when each blade reaches the microwave sensor is calculated by the above calculation method when the blade reaches the peak of the signal when the microwave sensor is located.
similarly, the time for calculating the starting point of each revolution of the engine rotor passing through the indicating sensor can also be measured by the maximum value method.
according to the embodiment of the present invention, the actual rotation arc length in step S3 is calculated specifically by first calculating the rotation duration of the engine rotor before the moment when the engine rotor starts to rotate and the moment when the engine rotor starts to rotate next according to the moment when the indication sensor collects the moment when the engine rotor starts to rotate before the moment. The rotational frequency of the engine rotor at the present rotation is calculated based on the rotational time period of the engine rotor at the present rotation. And calculating the rotating perimeter of the blade tip in the rotating process according to the diameter of the blade, and calculating the rotating linear speed of the blade by combining the rotating time before the blade rotates. Then, the rotation duration of a certain blade is calculated according to the moment of the starting point of each rotation of the rotor of the engine and the moment of the blade reaching the microwave sensor, and the arc length swept by the balance point of the blade is calculated according to the linear speed of the rotation of the blade.
according to the embodiment of the invention, the arc length between the balance point of the blade tip and the microwave sensor when the engine rotor is located at the starting point in the step S4 can be obtained by a calibration method or by direct measurement.
fig. 4 is a schematic view showing a mounting structure of a sensor according to an embodiment of the present invention. In the embodiment shown in fig. 4, the starting mechanism is arranged on the rotor 6 of the engine, and a pin 2 is used as the starting mechanism. The indication sensor 3 is arranged near the engine rotor 6, the directions of sending and receiving microwave signals of the indication sensor 3 penetrate through the rotating shaft of the engine rotor 6, and the pin 2 is arranged opposite to the indication sensor 3. The microwave sensor 4 is mounted on the engine casing 5 and is arranged opposite to the blade 1 of the engine rotor 6. Fig. 5 is a schematic view showing the rotation of the rotor of the engine of the embodiment shown in fig. 4.
the positional relationship when the starting point of the engine rotor 6 reaches the indicating sensor 3 is shown in fig. 4. At this time, the pin 2 passes through the indicating sensor 3, and a peak voltage signal is generated on the waveform of the signal of the indicating sensor 3. The arc length of rotation of the tip of the blade 1, i.e. the arc length between the position of the balance point 7 of the tip of the blade 1 and the microwave sensor 4, is denoted d1, and this arc length d1 is a fixed value and does not vary with the vibration of the blade 1.
The engine rotor 6 rotates clockwise, and the position relationship when the blade 1 reaches the position of the microwave sensor 4 is shown in fig. 5. At this time, the arc length corresponding to the angle of rotation of the starting point of the engine rotor 6 is denoted as d2, and this arc length d2 is the arc length swept by the balance point 7 of the blade 1. The circumference of the periphery of the engine rotor 6 is calculated by the diameter of the engine rotor 6, the linear velocity of the engine rotor 6 is calculated according to the time T of each revolution of the engine rotor 6, and the arc length d2 can be calculated by utilizing the linear velocity and the time T1 when the blade passes through the microwave sensor.
the vibration displacement of the blade 1 is a displacement Δ d between the current position of the tip of the blade 1 and the balance point 7 of the blade 1, which is d2-d 1. When the vibrational displacement of the blade 1 changes, the arc length d2 swept by the balance point 7 of the blade 1 changes as the vibrational displacement of the blade 1 changes.
According to embodiments of the present invention, arc length d1 may be obtained according to a calibration method or directly measured. The calibration method comprises the following specific steps: at low engine speeds, the blade 1 does not vibrate, i.e. the blade 1 is always at the position of the equilibrium point 7, so the arc lengths d1 and d2 calculated above are equal. The arc length d2 swept by the blade 1 during rotation was tested in the normal way, and thus the arc length d1 was also calibrated.
Fig. 6 is a schematic configuration diagram showing a measuring apparatus according to an embodiment of the present invention. The device for measuring the blade vibration displacement according to the embodiment shown in fig. 6 includes a blade tip passing time acquiring device, a starting time acquiring device and a processing unit.
the blade tip passing timing acquisition means is configured to acquire a timing at which a tip of each blade of the engine rotor passes the microwave sensor. The start timing obtaining means is configured to obtain a timing of a start point per rotation of the engine rotor. The processing unit can calculate the rotation arc length of the starting point of each rotation of the engine rotor according to the moment when the blade tip of the blade passes through the microwave sensor and the moment when the starting point of each rotation of the engine rotor; and the vibration displacement of the blade can be calculated according to the rotation arc length of the starting point of each rotation of the engine rotor and the arc length between the balance point position of the blade tip and the microwave sensor when the engine rotor is positioned at the starting point.
according to an embodiment of the invention, the blade tip passing time acquiring device comprises a microwave sensor, a microwave signal demodulating system and a regulating signal source, wherein the microwave sensor is configured to transmit a microwave signal and receive a reflected signal reflected by a blade of an engine rotor, the microwave signal demodulating system is configured to directly receive the microwave signal transmitted by the microwave sensor and serve as a reference signal, collect the reflected signal and acquire a phase curve and an amplitude curve according to the reference signal and the reflected signal, and the demodulating signal source is configured to provide a demodulated signal by the microwave signal demodulating system.
According to the embodiment of the invention, the starting moment acquisition device comprises a starting mechanism and an indicating sensor, wherein the starting mechanism is fixed on the engine rotor and used as a rotation starting point of the engine rotor, and the indicating sensor is used for acquiring a signal of the starting point of each rotation of the engine rotor by acquiring a signal of the starting mechanism.
fig. 7 is a schematic configuration diagram showing the microwave signal mediation system in the embodiment shown in fig. 6. According to the embodiment shown in fig. 7, the microwave signal demodulation system includes a first down converter, a phase shifter, a second down converter and an I/Q demodulator, wherein the first down converter is configured to process the reflection signal into a low-frequency reflection signal, the phase shifter is configured to delay the low-frequency reflection signal by 90 ° to obtain a low-frequency reflection signal delayed by 90 ° in phase, the second down converter is configured to process the reference signal into a low-frequency reference signal, and the I/Q demodulator is configured to calculate a phase curve and an amplitude curve according to the low-frequency reflection signal, the low-frequency reference signal and the low-frequency reflection signal delayed by 90 ° in phase. In summary, the embodiments of the present invention can accurately measure the blade vibration displacement in real time under the normal operating condition of the engine, and are not affected by the complex environment inside the engine, the shape of the blade, the surface characteristics of the blade, the high-speed rotation, and the like. Due to the adoption of a non-contact measuring method, the blades of all stages of the engine rotor can be measured. In addition, because the embodiment of the invention adopts the wave crest method to obtain each time needing to be measured, the reflected signal of the blade and the initial point signal of the indicating sensor can be quickly and accurately identified. Meanwhile, the embodiment of the invention adopts an IQ demodulation microwave signal method, and can rapidly and stably demodulate the phase curve and the amplitude curve of the blade signal, thereby rapidly and accurately measuring the vibration displacement of the blade.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
in the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed.
in addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (11)
1. A method of measuring vibratory displacement of a blade, comprising:
Acquiring the moment when the blade tip of each blade of the engine rotor passes through the microwave sensor;
Acquiring the moment of each starting point of the rotation of the engine rotor;
Calculating the rotation arc length of the starting point of each rotation of the engine rotor according to the moment when the blade tip of any blade passes through the microwave sensor, the moment of the starting point of each rotation of the engine rotor and the rotation speed of the engine rotor;
And calculating the vibration displacement of the blade according to the rotation arc length of the starting point of each rotation of the engine rotor and the arc length between the balance point position of the blade tip and the microwave sensor when the engine rotor is positioned at the starting point.
2. The method of measuring vibratory displacement of a blade of claim 1, further comprising:
acquiring a reflected signal emitted by the microwave sensor and reflected by the blade by using the microwave sensor;
Directly receiving a microwave signal transmitted by the microwave sensor as a reference signal;
and calculating the moment when the blade tip of each blade passes through the microwave sensor according to the reflection signal and the reference signal.
3. the method of measuring vibratory displacement of a blade of claim 2, further comprising:
Acquiring a phase curve and an amplitude curve according to the reference signal and the reflected signal;
And analyzing the moment when the blade tip of each blade passes through the microwave sensor according to the phase curve and the amplitude curve.
4. the method of measuring vibratory displacement of a blade of claim 3, further comprising:
Respectively converting the reflection signals into low-frequency reflection signals and low-frequency reflection signals delayed by 90 degrees;
Converting the reference signal into a low-frequency reference signal;
And inputting the low-frequency reflection signal, the low-frequency reference signal and the low-frequency reflection signal with the phase delayed by 90 degrees into a microwave signal demodulation system to calculate the phase curve and the amplitude curve.
5. the method of measuring vibratory displacement of a blade of claim 1, further comprising:
Acquiring a starting point signal of each rotation of the engine rotor through an indicating sensor;
And calculating the moment of the starting point of each rotation of the engine rotor according to the starting point signal of each rotation of the engine rotor.
6. the method of measuring vibratory displacement of blades according to claim 1, wherein the time when the tip of each blade passes the microwave sensor and the time when the starting point of each revolution of the engine rotor are measured separately by a maximum value method.
7. The method for measuring the vibration displacement of the blade as claimed in claim 1, wherein the arc length between the position of the balance point of the blade tip and the microwave sensor when the engine rotor is at the starting point is obtained by a calibration method or direct measurement.
8. A blade vibrational displacement measuring apparatus comprising:
The blade tip passing time acquiring device is configured to acquire the time when the blade tip of each blade of the engine rotor passes through the microwave sensor;
a start timing acquisition device configured to acquire a timing of a start point per rotation of the engine rotor;
The processing unit can calculate the rotating arc length of the starting point of each rotation of the engine rotor according to the moment when the blade tip of the blade passes through the microwave sensor and the moment of the starting point of each rotation of the engine rotor; and the vibration displacement of the blade can be calculated according to the rotation arc length of the starting point of each rotation of the engine rotor and the arc length between the balance point position of the blade tip and the microwave sensor when the engine rotor is positioned at the starting point.
9. The apparatus for measuring vibrational displacement of blades according to claim 8, wherein said blade tip passing timing obtaining means includes:
A microwave sensor configured to transmit a microwave signal and receive a reflected signal reflected by a blade of the engine rotor;
A microwave signal demodulation system configured to directly receive the microwave signal emitted by the microwave sensor and serve as a reference signal, collect the reflected signal, and acquire a phase curve and an amplitude curve according to the reference signal and the reflected signal, and,
a demodulation signal source configured to provide a demodulation signal for the microwave signal demodulation system.
10. The apparatus for measuring vibratory displacement of a blade of claim 9, wherein the microwave signal demodulation system comprises:
A first down converter for processing the reflected signal into a low frequency reflected signal;
the phase shifter is used for delaying the low-frequency reflection signal by 90 degrees of phase to obtain a low-frequency reflection signal delayed by 90 degrees of phase;
a second down converter for processing the reference signal into a low frequency reference signal;
And the I/Q demodulator is used for calculating a phase curve and an amplitude curve according to the low-frequency reflection signal, the low-frequency reference signal and the low-frequency reflection signal delayed by 90 degrees of phase.
11. the apparatus for measuring vibrational displacement of blades according to claim 8, wherein said start time obtaining means includes:
the starting mechanism is fixed on the engine rotor and used as a rotation starting point of the starting mechanism;
And the indicating sensor is used for acquiring a starting point signal of each rotation of the engine rotor by acquiring the signal of the starting mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610635337.9A CN107655429B (en) | 2016-08-04 | 2016-08-04 | Method and device for measuring vibration displacement of blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610635337.9A CN107655429B (en) | 2016-08-04 | 2016-08-04 | Method and device for measuring vibration displacement of blade |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107655429A CN107655429A (en) | 2018-02-02 |
| CN107655429B true CN107655429B (en) | 2019-12-17 |
Family
ID=61127410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610635337.9A Active CN107655429B (en) | 2016-08-04 | 2016-08-04 | Method and device for measuring vibration displacement of blade |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107655429B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109000776B (en) * | 2018-09-28 | 2020-09-04 | 北京化工大学 | Turbine blade vibration parameter analysis method and analysis device |
| CN111256636B (en) * | 2018-11-30 | 2021-11-19 | 上海电气电站设备有限公司 | Method for measuring torsion of blade |
| CN109556765B (en) * | 2018-12-10 | 2021-02-19 | 中国航发四川燃气涡轮研究院 | Blade non-contact vibration stress measurement value conversion method |
| CN110608673B (en) * | 2019-05-21 | 2020-11-17 | 西安交通大学 | Integrated measurement method for axial displacement, radial vibration displacement and rotating speed of rotor |
| CN110553716B (en) * | 2019-10-12 | 2020-07-10 | 西安交通大学 | Method for measuring vibration natural frequency of looped blade structure based on computer vision |
| CN111323190B (en) * | 2020-04-13 | 2021-01-12 | 北京化工大学 | Measuring method and measuring device for five-dimensional vibration of rotating blade |
| CN112611449A (en) * | 2020-12-30 | 2021-04-06 | 南安昌晟消防科技有限公司 | Blade vibration measuring method of wind generating set |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08271489A (en) * | 1995-03-31 | 1996-10-18 | Osaka Gas Co Ltd | Method and apparatus for evaluating damage of metallic sample |
| US5794942A (en) * | 1993-01-08 | 1998-08-18 | The Texas A&M University System | Modulated pressure damper seals |
| CN103364069A (en) * | 2012-04-05 | 2013-10-23 | 中国航空工业集团公司沈阳发动机设计研究所 | Non-contact rotating vane vibration testing method based on positioning without rotating speed |
| CN105300513A (en) * | 2015-11-20 | 2016-02-03 | 天津大学 | Method and device for identifying resonance frequency multiplication number of blade vibration of multiple tip timing sensors |
-
2016
- 2016-08-04 CN CN201610635337.9A patent/CN107655429B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5794942A (en) * | 1993-01-08 | 1998-08-18 | The Texas A&M University System | Modulated pressure damper seals |
| JPH08271489A (en) * | 1995-03-31 | 1996-10-18 | Osaka Gas Co Ltd | Method and apparatus for evaluating damage of metallic sample |
| CN103364069A (en) * | 2012-04-05 | 2013-10-23 | 中国航空工业集团公司沈阳发动机设计研究所 | Non-contact rotating vane vibration testing method based on positioning without rotating speed |
| CN105300513A (en) * | 2015-11-20 | 2016-02-03 | 天津大学 | Method and device for identifying resonance frequency multiplication number of blade vibration of multiple tip timing sensors |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107655429A (en) | 2018-02-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107655429B (en) | Method and device for measuring vibration displacement of blade | |
| US8121813B2 (en) | System and method for clearance estimation between two objects | |
| CN105973448B (en) | A kind of apparatus for rotating vane vibration measurement method and system | |
| Lawson et al. | Tubomachinery blade vibration amplitude measurement through tip timing with capacitance tip clearance probes | |
| US6584849B2 (en) | Analyzing vibration of rotating blades | |
| US7509862B2 (en) | System and method for providing vibration detection in turbomachinery | |
| CN105466550B (en) | Non-homogeneous lack sampling blade tip-timing vibration signal reconstruction method and its device | |
| CN105509876B (en) | Lack sampling blade tip-timing vibration signal reconstruction method and its device | |
| CN111239432B (en) | Blade arrival time measuring method based on blade end timing and acquisition system thereof | |
| US10539588B2 (en) | Method for reducing error in rotor speed measurements | |
| CN103116032A (en) | Method and device for acquiring rotating speed of wind generating set | |
| US9593998B2 (en) | Method for determining current eccentricity of rotating rotor and method of diagnostics of eccentricity of rotating rotor | |
| CN109540482A (en) | A kind of turbine blade is without the mutually high frequency multiplication synchronous vibration parameters analysis method of key and analytical equipment | |
| CN106092534B (en) | Blade modal damps measuring method | |
| CN205426330U (en) | Device is discerned to many apex timing sensor blade vibration resonance frequencies | |
| CN103221791A (en) | Method for monitoring a rotary element belonging to a mechanical transmission of a wind turbine | |
| JP2012137335A (en) | Method and apparatus for measuring vibration of bucket | |
| CN107247155A (en) | A kind of rotor of turbogenerator set transient speed test device and its method of testing | |
| CN104677486A (en) | Aero-engine vibration signal phase measurement method based on revolving speed pulse reconstruction | |
| CN110991018A (en) | Blade tip timing arrival pulse signal simulation method | |
| CN211777611U (en) | Device for measuring synchronous vibration and pitch diameter of shrouded blade | |
| RU2584723C1 (en) | Method of determining parameters of oscillations of blades of rotating wheel of turbine machine and device therefor | |
| CN110844110B (en) | Method for determining phase of blade motion parameter | |
| JP6468511B2 (en) | Vibration detection device, rotating machine, vibration detection method and program | |
| US20160319695A1 (en) | System and methods for determining blade clearance for asymmertic rotors |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |