CN108593229A - Integral impeller blade vibration measurement device and measurement method - Google Patents
Integral impeller blade vibration measurement device and measurement method Download PDFInfo
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- CN108593229A CN108593229A CN201810253565.9A CN201810253565A CN108593229A CN 108593229 A CN108593229 A CN 108593229A CN 201810253565 A CN201810253565 A CN 201810253565A CN 108593229 A CN108593229 A CN 108593229A
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- piezoelectric patches
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- blade vibration
- vibration measurement
- data acquisition
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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
Abstract
The present invention provides a kind of Integral impeller blade vibration measurement devices, including experimental stand and impeller assembly, impeller assembly is mounted on experimental stand；The impeller assembly includes integral wheel (2), piezoelectric patches excitation system, data storage device and data acquisition equipment；Piezoelectric patches excitation system includes piezoelectric patches (6), and the piezoelectric patches (6) is installed in data acquisition equipment on integral wheel (2)；Data acquisition equipment is connected on data storage device.The present invention also provides a kind of Integral impeller blade vibration measurement methods using above-mentioned Integral impeller blade vibration measurement device.Measuring device provided by the invention can make tested integral wheel by generation vibration under the Engine Excitation of required order, and obtain the vibration data of blade, can be used for blade oscillation measurement, the effect of blade vibration impedance bundary measure is forecast.
Description
Technical field
The present invention relates to vibration damping fields, and in particular, to a kind of Integral impeller blade vibration measurement device and measurement method.
Background technology
The ratio that stress fracture failure caused by high cycle fatigue accounts for engine failure occurs due to flow-induced vibration for engine blade
Example up to 40%.To save oil consumption, development trend is widely used integral wheel (also referred to as integral blade disc) or whole leaf joint skill
Art.Integral wheel structure is by blade and wheel disc be cast or the mechanical processings mode such as forging is made of one, or by ready-made list
A blade electron beam is welded to wheel disc outer rim and forms one.Although integral wheel loss of weight may be up to 25~40%, knot
Structure damping ratio drops to 0.01% magnitude, while conventional frictions impedance bundary technology is no longer feasible between some convex shoulders, leaf etc..For
Reduce and the risk that flow-induced vibration unstability causes the stress excessive occurs, it usually needs integral wheel is carried out at dry-friction damping
Reason.In order to effectively be forecast to the effect of dry-friction damping processing, needing to establish integral wheel, (processing containing frictional damping is arranged
Apply) vibration-testing apparatus of blade.Integral wheel is surveyed with traditional blades and the vibration of blade in the impeller of wheel disc split design
Examination, the forecast of impedance bundary effect have marked difference.In integral wheel, blade is no longer the tenon by rotor blade one by one
Head is mounted in the tongue-and-groove of wheel disc and links together, and impedance bundary measure between two blades nor for frictional damping is carried out
Processing, therefore one or more blades can not be taken out and tested, it is necessary to it is tested for entire integral wheel；It rubs simultaneously
The centrifugal force that the performance of impedance bundary measure effect is generated dependent on the rotation of impeller, therefore also must be considered that integral wheel high speed
Rotating speed when rotation.Measurement measure at present for blade vibratory response in integral wheel under rotation status is few.It is primarily present
Difficult point be：First, the influence of high speed rotation rotating speed, rotating speed height causes to increase the requirements such as misaligning；Second is that Airflow Exciting-Vibration Force
Influence it is more difficult how reliably to apply each rank exciting force especially under rotation status；Third, the influence of data acquisition, special
It is not under high speed rotation, acquisition instrument is set as why not influenced the rotation imbalance amount of aerodynamics and integral wheel, storing
It is standby how to be stored.
Invention content
For the defects in the prior art, the object of the present invention is to provide a kind of Integral impeller blade vibration measurement device with
Measurement method.
According to Integral impeller blade vibration measurement device provided by the invention, including experimental stand and impeller assembly, impeller
Component is mounted on experimental stand；
The impeller assembly includes integral wheel, piezoelectric patches excitation system, data storage device and data acquisition equipment；
Piezoelectric patches excitation system includes piezoelectric patches, and the piezoelectric patches is installed in data acquisition equipment on integral wheel；
Data acquisition equipment is connected on data storage device.
Preferably, the piezoelectric patches excitation system also includes that control device is switched with the control of piezoelectric patches vibrator；Control dress
It sets, piezoelectric patches vibrator control switch, piezoelectric patches are sequentially connected；
Multiple piezoelectric patches are fixedly mounted on along integral wheel circumferential direction on the spoke of integral wheel.
Preferably, spoke along piezoelectric patches excitation system generate simulation flow-induced vibration flow direction on upstream face with
Piezoelectric patches is both provided on downstream face, the piezoelectric patches on piezoelectric patches and downstream face on upstream face is deposited in spoke circumferential direction
It is poor in setting angle；
The control device is mounted on the center of integral wheel.
Preferably, the data acquisition equipment includes the acceleration transducer on the blade of integral wheel and strain
Piece sensor；
Data acquisition equipment is evenly arranged in impeller circumferential direction.
Preferably, the experimental stand includes the transmission shaft being fastenedly connected and installation disk；
The integral wheel, control device and piezoelectric patches vibrator control switch are installed on installation disk.
Preferably, the data storage device includes the on-line storage electronic box being arranged on installation disc centre position；
The on-line storage electronic box includes timer, RAM card, USB interface and A/D conversion modules.
Preferably, the transmission shaft is the Hollow Transmission Shafts with axially extending bore；
Wherein one end in the both ends of hollow rotating shaft in axial direction is connected with installation disk, and cunning is equipped on the other end
Ring, the data signal line connected on data acquisition equipment are connected after passing through the axially extending bore in Hollow Transmission Shafts with slip ring；
Data storage device is connected with the slip ring.
Preferably, experimental stand also includes motor and holder；
Motor is connected with Hollow Transmission Shafts, and Hollow Transmission Shafts are rack-mount by the bearing of setting；
It is additionally provided with encoder on the other end of the Hollow Transmission Shafts in axial direction.
Preferably, also comprising vacuum chamber, internal vacuum chamber forms accommodation space, and the installation disk is all provided with integral wheel
It sets in accommodation space；
Hollow Transmission Shafts are justified from the spatially extended rear and installation in vacuum chamber arrival accommodation space except accommodation space
Disk is connected；
It is connected by rotating seal between Hollow Transmission Shafts and vacuum chamber；Be additionally provided on the vacuum chamber vacuum pump with
Vacuometer.
The present invention also provides a kind of Integral impeller blades using above-mentioned Integral impeller blade vibration measurement device to shake
Dynamic measurement method, comprises the steps of：
Vacuum drawn step：Vacuum pump is opened, after the vacuum degree in accommodation space reaches setting value, closes vacuum pump；
Simulate flow-induced vibration forming steps：Control device is enabled to control the level that switch applies setting to piezoelectric patches vibrator,
Control the voltage in piezoelectric patches；
Data acquisition step：Motor is opened, data acquisition equipment is enabled to acquire blade vibration data；
Data storing steps：Data storage device is enabled to store blade vibration data.
Compared with prior art, the present invention has following advantageous effect：
1, measuring device provided by the invention can make to produce under tested Engine Excitation of the integral wheel by required order
Raw vibration, and the vibration data of blade is obtained, it is pre- to can be used for blade oscillation measurement, the effect of blade vibration impedance bundary measure
Report.
2, the present invention, which solves existing paddle response vibration-testing, can not take into account excitation simulation, response test under high speed rotation
The technical issues of.
3, the on-line storage module arrangement in the present invention is in wheel disk center, when data are stored to certain capacity, in taking-up
Card is deposited, off-line data processing is carried out；The acceleration transducer of blade surface and the cabling of strain-ga(u)ge transducer are along blade simultaneously
Surface is symmetrical, reduces the influence that performance is misaligned to high speed rotational blade.
4, the configuration of the present invention is simple is reasonable, reliable for operation.
Description of the drawings
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon：
Fig. 1 is Integral impeller blade vibration measurement device structural schematic diagram provided by the invention；
Fig. 2 is piezoelectric patches excitation system and data acquisition equipment schematic view of the mounting position；
Fig. 3 is the excitation for 0,1,2,4 orders that piezoelectric patches excitation system is eradicated.
It is shown in figure：
Specific implementation mode
With reference to specific embodiment, the present invention is described in detail.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection domain.
In the description of the present invention, it is to be understood that, term "upper", "lower", "front", "rear", "left", "right", " perpendicular
Directly ", the orientation or positional relationship of the instructions such as "horizontal", "top", "bottom", "inner", "outside" is orientation based on ... shown in the drawings or position
Relationship is set, is merely for convenience of description of the present invention and simplification of the description, device is not indicated or implied the indicated or element is necessary
With specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
Integral impeller blade vibration measurement device provided by the invention, including experimental stand and impeller assembly, impeller assembly
On experimental stand.The impeller assembly includes integral wheel 2, piezoelectric patches excitation system, data storage device and number
According to collecting device, piezoelectric patches excitation system includes piezoelectric patches 6, and the piezoelectric patches 6 is installed in whole leaf with data acquisition equipment
On wheel 2, data acquisition equipment is connected on data storage device.The data acquisition equipment includes mounted on integral wheel 2
Acceleration transducer 7 and strain-ga(u)ge transducer 8, data acquisition equipment on blade are evenly arranged in impeller circumferential direction, phase
The cabling of Ying Di, data acquisition equipment are also symmetrical along blade surface, and performance is misaligned to reduce high speed rotational blade
Influence.Preferably, the data acquisition equipment is fixed on by way of stickup on blade.
The piezoelectric patches excitation system also includes that control device 4 controls switch 5 with piezoelectric patches vibrator；Control device 4, pressure
Electric piece vibrator control switch 5, piezoelectric patches 6 are sequentially connected, and multiple piezoelectric patches 6 are fixedly mounted on along 2 circumferential direction of integral wheel
On the spoke of integral wheel 2.Upstream of the spoke on the flow direction of the simulation flow-induced vibration generated along piezoelectric patches excitation system
It is both provided with piezoelectric patches 6 on face and downstream face, the piezoelectric patches 6 on upstream face is with the piezoelectric patches 6 on downstream face along spoke circumferential direction
It is poor that there are setting angles on direction.Preferably, piezoelectric patches 6 is pasted onto by insulation and silver-colored conductive epoxy adhesives on spoke.It is excellent
Selection of land, the control device 4 is mounted on the center of integral wheel 2, to reduce the shadow that high speed rotational blade misaligns performance
It rings.
The experimental stand includes the transmission shaft that is fastenedly connected and installation disk 3, the integral wheel 2, control device 4 with
And piezoelectric patches vibrator control switch 5 is installed on installation disk 3.In embodiment, the transmission shaft is with axially extending bore
Hollow Transmission Shafts 9, wherein one end in the both ends of hollow rotating shaft in axial direction is connected with installation disk 3, on the other end
Slip ring 13 is installed, the data signal line connected on data acquisition equipment pass through after the axially extending bore in Hollow Transmission Shafts 9 with cunning
Ring 13 is connected, and data storage device is connected with the slip ring 13, and the blade vibration data that such data acquisition equipment acquires can be with
It is transmitted in data storage device by slip ring 13 in real time.In change case, the data storage device includes to be arranged in installation circle
On-line storage electronic box on 3 center of disk, the on-line storage electronic box include timer, RAM card, USB interface and
A/D conversion modules take out RAM card when data are stored to certain capacity, carry out off-line data processing.On-line storage electronic box
The influence for misaligning performance to high speed rotational blade also for reduction at installation 3 center of disk is set.
Experimental stand also includes motor 11 and holder, and motor 11 is connected with Hollow Transmission Shafts 9, and Hollow Transmission Shafts 9 are by setting
The bearing 10 set is rack-mount, and encoder 12 is additionally provided on the other end of the Hollow Transmission Shafts 9 in axial direction.Separately
Outside, measuring device provided by the invention also includes vacuum chamber 1, and the inside of vacuum chamber 1 forms accommodation space, the installation disk 3 and
Integral wheel 2 is arranged in accommodation space.Hollow Transmission Shafts 9 from except accommodation space it is spatially extended through vacuum chamber 1 to
It is connected with installation disk 3 after in up to accommodation space, is connected by rotating seal 15 between Hollow Transmission Shafts 9 and vacuum chamber 1.Institute
It states and is additionally provided with vacuum pump 14 and vacuometer 16 on vacuum chamber 1.Preferably, the vacuum chamber 1, can also set on experimental stand
The measuring apparatus such as pressure thermometer, the tachometer of monitoring are set, the signal that these measuring apparatus generate can also be transmitted to data
It is stored in storage device.
The present invention also provides a kind of Integral impeller blades using above-mentioned Integral impeller blade vibration measurement device to shake
Dynamic measurement method, comprises the steps of：Vacuum drawn step：Vacuum pump 14 is opened, is set when the vacuum degree in accommodation space reaches
After definite value, vacuum pump 14 is closed；Simulate flow-induced vibration forming steps：Control device 4 is enabled to be applied to piezoelectric patches vibrator control switch 5
Fixed level is added, the voltage in piezoelectric patches 6 is controlled；Data acquisition step：Motor 11 is opened, data acquisition equipment is enabled to acquire leaf
Piece vibration data；Data storing steps：Data storage device is enabled to store blade vibration data.
Preferred embodiment：
Integral impeller blade vibration measurement device structure is as shown in Figure 1 under the rotation status of the present invention.Vacuum chamber 1 provides
The vacuum environment of Integral impeller blade vibration-testing can effectively eliminate the influence of aerodynamics, and vacuum chamber 1 is preferably with height
The transparent material of intensity is processed making, while in order to ensure air-tightness, needing be bolted between the seam of vacuum chamber
On the basis of carry out glue envelope processing；Hollow Transmission Shafts 9 and the equal seam crossings of slip ring 13 are also required to be sealed processing.In vacuum pump 14
Under the action of, the air in vacuum chamber 1 is extracted, and the vacuum degree in vacuum chamber 1 is monitored by vacuometer 16, when reaching
After required vacuum degree, vacuum pump 14 is stopped, and at this time can start to measure work, namely the vacuum when blade vibration is tested
Pump 14 necessarily is in closed state.Pressure in vacuum chamber 1 maintains 20mbar or so by two-stage vane pump, rather than minimum
1mbar, this be in order to piezoelectric patches 6 optimum performance play.
Integral wheel 2 is loaded into the end that Hollow Transmission Shafts 9 are located in vacuum chamber 1 by installing disk 3, installs disk 3
The attachment device that integral wheel 2 is installed in practical steam turbine should be simulated as possible；The other end of Hollow Transmission Shafts 3 connects motor
11,11 high speed rotation of motor provides power, and 2 high speed rotation of integral wheel is driven by Hollow Transmission Shafts 9.Hollow Transmission Shafts 9 are logical
2 groups of bearings 10 for crossing left and right ends are supported.Since Hollow Transmission Shafts 9 need, across an end face of vacuum chamber 1, to adopt
The leakproofness of vacuum chamber 1 is not had an impact with the guarantee of rotating seal 15.In addition, cabling is needed in Hollow Transmission Shafts 9, including
The supply lines of piezoelectric patches 6, the control line of control device 4, the cable of encoder 12, the cabling of acceleration transducer 7 and strain
The cabling of sensor 8.In order to realize the transmission of data between sound component, in the end connection slip ring 13 of Hollow Transmission Shafts 9.
As shown in Fig. 2, the piezoelectric patches 6 in piezoelectric patches excitation system is by insulating with silver-colored conductive epoxy adhesives circumferentially
It is pasted onto on the spoke of integral wheel, N number of piezoelectric patches is arranged on the incoming upstream and downstream two sides of spoke.4 cloth of control device
It sets at the center of installation disk 3, reduces to the greatest extent to misaligning and the influence of amount of unbalance.Piezoelectric patches vibrator controls 5 pairs of switch
Claim to be arranged on the circle of circumference one of installation disk 3.Piezoelectric patches is operated in d31Pattern.Control device 4 is controlled to piezoelectric patches vibrator
Switch 5 applies the voltage in corresponding level control piezoelectric patches, controls the phase of piezoelectric patches exciting force to the rank needed for realization
Secondary excitation；There are certain differential seat angles between two groups of piezoelectric patches 6 of upstream and downstream simultaneously, and are given respectively by control device 4
Go out sinusoidal and cosine mode voltage analog wave-passage excitation.As shown in figure 3, by taking N=60 piezoelectric patches 6 as an example, when each piezoelectricity
The phase of piece after rationally controlling, may be implemented 0 rank, 1 rank, 2 ranks, 4 rank exciting forces (corresponding pitch diameter is respectively 0,1,2,4,
Other each rank exciting forces can similarly obtain), due to the coupling between rim section and blade, piezoelectric patches 6 can be provided
The exciting force of each order is applied on blade.
As shown in Fig. 2, the acceleration transducer 7 of small size high sensitivity that the blade surface of integral wheel 2 is pasted and small
The data that the strain-ga(u)ge transducer 8 of size high sensitivity can respond blade vibration are acquired, in stickup and arrangement, leaf
The acceleration transducer 7 on piece surface and the cabling of strain-ga(u)ge transducer 8 are first symmetrical along blade surface, to reduce to high speed
Rotating vane misaligns the influence of performance.
A kind of embodiment of data storage device be by be arranged in the on-line storage electronic box at installation disk 3 center into
Row storage, on-line storage electronic box includes timer, RAM card, USB interface, A/D conversion modules.On-line storage electronic box is arranged
At 3 center of installation disk, to reduce the influence for misaligning performance to high speed rotational blade.When data are stored to certain capacity,
RAM card is taken out, off-line data processing is carried out.
The another embodiment of data storage device is the acceleration transducer 7 and strain-ga(u)ge transducer blade surface
The signal wire of 8 gathered datas is connected to the moved end of slip ring 13 by Hollow Transmission Shafts 3, and the other end of slip ring 13 passes data in real time
Pass data storage device.The pressure thermometer of monitoring, tacho signal are stored also by this mode.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring the substantive content of the present invention.In the absence of conflict, the feature in embodiments herein and embodiment can arbitrary phase
Mutually combination.
Claims (10)
1. a kind of Integral impeller blade vibration measurement device, which is characterized in that include experimental stand and impeller assembly, impeller assembly
On experimental stand；
The impeller assembly includes integral wheel (2), piezoelectric patches excitation system, data storage device and data acquisition equipment；
Piezoelectric patches excitation system includes piezoelectric patches (6), and the piezoelectric patches (6) is installed in data acquisition equipment on integral wheel (2)；
Data acquisition equipment is connected on data storage device.
2. Integral impeller blade vibration measurement device according to claim 1, which is characterized in that piezoelectric patches exciting system
System also includes control device (4) and piezoelectric patches vibrator control switch (5)；Control device (4), piezoelectric patches vibrator control switch
(5), piezoelectric patches (6) is sequentially connected；
Multiple piezoelectric patches (6) are fixedly mounted on along integral wheel (2) circumferential direction on the spoke of integral wheel (2).
3. Integral impeller blade vibration measurement device according to claim 2, which is characterized in that spoke swashs along piezoelectric patches
It is both provided with piezoelectric patches (6), upstream on upstream face and downstream face on the flow direction for the simulation flow-induced vibration that vibrating system generates
Piezoelectric patches (6) on face and the piezoelectric patches (6) on downstream face are that there are setting angles in spoke circumferential direction is poor；
The control device (4) is mounted on the center of integral wheel (2).
4. Integral impeller blade vibration measurement device according to claim 1, which is characterized in that the data acquisition equipment
Including the acceleration transducer (7) on the blade of integral wheel (2) and strain-ga(u)ge transducer (8)；
Data acquisition equipment is evenly arranged in impeller circumferential direction.
5. Integral impeller blade vibration measurement device according to claim 2, which is characterized in that the experimental stand includes
The transmission shaft being fastenedly connected and installation disk (3)；
The integral wheel (2), control device (4) and piezoelectric patches vibrator control switch (5) are installed in installation disk (3)
On.
6. Integral impeller blade vibration measurement device according to claim 5, which is characterized in that the data storage device
Including being arranged in the on-line storage electronic box on installation disk (3) center；
The on-line storage electronic box includes timer, RAM card, USB interface and A/D conversion modules.
7. Integral impeller blade vibration measurement device according to claim 5, which is characterized in that the transmission shaft be with
The Hollow Transmission Shafts (9) of axially extending bore；
Wherein one end in the both ends of hollow rotating shaft in axial direction is connected with installation disk (3), and cunning is equipped on the other end
Ring (13), the data signal line connected on data acquisition equipment pass through after the axially extending bore in Hollow Transmission Shafts (9) with slip ring
(13) it is connected；
Data storage device is connected with the slip ring (13).
8. Integral impeller blade vibration measurement device according to claim 7, which is characterized in that experimental stand also includes electricity
Machine (11) and holder；
Motor (11) is connected with Hollow Transmission Shafts (9), and Hollow Transmission Shafts (9) are rack-mount by the bearing (10) of setting；
It is additionally provided with encoder (12) on the other end of the Hollow Transmission Shafts (9) in axial direction.
9. Integral impeller blade vibration measurement device according to claim 8, which is characterized in that also include vacuum chamber (1),
Accommodation space is formed inside vacuum chamber (1), the installation disk (3) is arranged at integral wheel (2) in accommodation space；
Hollow Transmission Shafts (9) reach rear in accommodation space and installation from the spatially extended vacuum chamber (1) that runs through except accommodation space
Disk (3) is connected；
It is connect by rotating seal (15) between Hollow Transmission Shafts (9) and vacuum chamber (1)；It is also set up on the vacuum chamber (1)
There are vacuum pump (14) and vacuometer (16).
10. a kind of integral wheel leaf using the Integral impeller blade vibration measurement device described in any one of claim 1 to 9
Piece vibration measurement method, which is characterized in that comprise the steps of：
Vacuum drawn step：Vacuum pump (14) is opened, after the vacuum degree in accommodation space reaches setting value, closes vacuum pump
(14)；
Simulate flow-induced vibration forming steps：Control device (4) is enabled to apply the electricity of setting to piezoelectric patches vibrator control switch (5)
It is flat, the voltage in control piezoelectric patches (6)；
Data acquisition step：Motor (11) is opened, data acquisition equipment is enabled to acquire blade vibration data；
Data storing steps：Data storage device is enabled to store blade vibration data.
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| CN109506867A (en) * | 2019-01-08 | 2019-03-22 | 大连交通大学 | A kind of air-flow-heat engine coupling excitation experimental rig |
| CN109580071A (en) * | 2018-11-29 | 2019-04-05 | 浙江大学 | A kind of rotation drive shaft exciting force and impeller measurement of exciting force method |
| CN109612663A (en) * | 2019-01-08 | 2019-04-12 | 大连交通大学 | A kind of rotation high-frequency alternating air-flow excitation experimental rig |
| CN111350675A (en) * | 2020-03-10 | 2020-06-30 | 中国农业大学 | Quantitative measurement system for hydraulic damping ratio of rotary centrifugal impeller |
| CN113309710A (en) * | 2021-05-25 | 2021-08-27 | 清华大学 | Measuring device and measuring method for underwater mode of rotary impeller machine |
| CN113959664A (en) * | 2021-11-19 | 2022-01-21 | 华能国际电力股份有限公司 | Blade dynamic frequency remote measuring device using piezoelectric sheet |
| WO2022252353A1 (en) * | 2021-06-01 | 2022-12-08 | 上海交通大学 | Calibration device and method for blade tip timing measurement system |
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| CN111350675B (en) * | 2020-03-10 | 2021-02-19 | 中国农业大学 | Quantitative measurement system for hydraulic damping ratio of rotary centrifugal impeller |
| CN113309710A (en) * | 2021-05-25 | 2021-08-27 | 清华大学 | Measuring device and measuring method for underwater mode of rotary impeller machine |
| WO2022252353A1 (en) * | 2021-06-01 | 2022-12-08 | 上海交通大学 | Calibration device and method for blade tip timing measurement system |
| CN113959664A (en) * | 2021-11-19 | 2022-01-21 | 华能国际电力股份有限公司 | Blade dynamic frequency remote measuring device using piezoelectric sheet |
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