CN102322391A - Protection method for carrying out predictive analysis on vibration condition of wind turbine blades - Google Patents
Protection method for carrying out predictive analysis on vibration condition of wind turbine blades Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses an industrial protection method for carrying out predictive analysis on the vibration condition of wind turbine blades. The natural flapwise frequency interval value and the natural edgewise frequency interval value of the wind turbine blades in operation first need to be acquired to set a digital bandwidth filter and work out the maximum tolerable extreme acceleration value aS of the blades, the frequency-range digital bandwidth filter is utilized to filter out the flapwise frequency point value and the edgewise frequency point value of the blades, an acceleration point value is worked out according to the flapwise frequency point value and the edgewise frequency point value, and is filtered into a voltage amplitude, two to five seconds start to be counted, at least two transient acceleration point values are sampled each second, a CPU (central processing unit) is used for working out the arithmetic mean value of accelerations per second and then working out the final arithmetic mean value (full-time mean acceleration value apz) of the acceleration of the turbine blades within limited M seconds, and when timing exceeds M seconds, the apz is compared with the a S: if the apz is larger than or equal to aS, a controller controls a wind turbine to safely decelerate until the wind turbine is stopped, or else the wind turbine blades continue to operate. According to a blade vibration condition prediction result, the protection method can stop the rotation of the blades in advance in order to reduce economic loss caused by the damage of the blades.
Description
Technical field
The present invention relates to wind-driven generator intelligent monitoring technical field; Belong to the observation and control technology that blade of wind-driven generator vibration power frequency is forecast in advance; To reach the purpose that makes blower fan obtain protecting, particularly the pneumatic equipment blades made condition of shaking is carried out the guard method of forecast analysis.
Background technique
Wind power generating set all is arranged on the wind resource abundant area, but atrocious weather also often occurs in the wind resource abundant area, and especially in winter, wind speed is too high; Temperature is low excessively, and the head of wind-force unit and blade often will suffer boisterous baptism under running state, more is easy to generate the phenomenon of blade cracking; This loss is very big, can only after leaf destruction, far control shutdown at once passively to the personnel that wind-force unit real-time running state is monitored; This tends to take place the chain reaction that all the other intact blades rupture in succession or fracture, and promptly in stopping process, the blade on same typhoon power unit also can be damaged suddenly; The loss that this damage causes can not in time remedy especially, and for the sake of assurance, the staff of monitoring wind-force unit can only be immediately with all the other homotype unit shutdown inspections that is moving; The reason that causes the blade crack or fracture is more, and the wind-force unit output is higher, and stalling characteristics are not obvious; Also be one of factor of taking place of accident, but the most basis former because blade is when turning round before damage, from the damaged condition of blade; Resonance phenomenon frequently occurs, certainly, special blade vibration monitoring device is not set; Also be one of factor that causes the accident generation, therefore, the resonance that produces during work is prejudicial greatly to machinery.
Therefore, in sum, blade has very important effect for the stable operation of wind-powered electricity generation unit, the blade fault that in a single day is damaged, and the difficulty that the wind-force unit resumes operation is bigger, and the time is longer, causes bigger electric quantity loss.From economic aspect, the proportion that blade accounts in the complete machine cost reaches more than 1/5th, only is the direct loss that spare parts purchasing brings.At present; In the existing unit of existing wind energy turbine set; Comprise that still there is the part wind-force unit sheet (not passing through optimal design and improvement) of certain defective in the design of blade own, cause the potential risk of blade injury when all having work the more less because of resonance, iff is that quantity wind-force turbines vane on the low side carries out design optimization; Obviously be uneconomic, also just can not guarantee its normal design service life.
Summary of the invention
The object of the present invention is to provide and a kind of the pneumatic equipment blades made condition of shaking is carried out the guard method of forecast analysis; Can predict the operating mode of the blade of wind energy conversion system running in advance; According to predicting the outcome to the blade movement operating mode; Make blade shift to an earlier date stall, reach blade is early found and the purpose of early remedying, reduce to greatest extent because blade damages the economic loss that causes.
The objective of the invention is to realize like this: a kind of the pneumatic equipment blades made condition of shaking is carried out the guard method of forecast analysis; A kind of to the pneumatic equipment blades made guard method that condition predicts of shaking; Comprise have the vibration monitoring module, the controller and the CPU of rotation speed monitoring module, relay, acceleration metering appearance and vibration transducer; The method step characteristic of its realization is: 1. utilize existing computational methods to wind power generation unit blade; In conjunction with the relevant performance parameter that wind energy conversion system blade of the same type has been tested out; Rotating speed according to the wind energy conversion system trouble free service; So that intrinsic flapping frequency interval value Fhx-Fhd and intrinsic shimmy range between a frequency value Fbx-Fbd when knowing the above-mentioned wind energy conversion system of the on-the-spot operation of having installed blade working of the same type; According to above-mentioned intrinsic flapping frequency interval value and intrinsic shimmy range between a frequency value, utilize the CPU correspondence frequency range to be set at digital bandwidth wave filter between the above-mentioned Fhx-Fhd and the digital bandwidth wave filter of frequency range between above-mentioned Fbx-Fbd, according to the beaming limit of pneumatic equipment blades made with reverse the maximum that the limit calculates above-mentioned blade of the same type and stand limit acceleration value aS; 2. at the digital bandwidth wave filter between the Fbx-Fbd blade is leached at flapping frequency point value between the Fhx-Fhd and the shimmy frequency point value between Fbx-Fbd at digital bandwidth wave filter between the Fhx-Fhd and frequency range by frequency range; And adopt digital filtering to try to achieve the relevant acceleration point value according to the flapping frequency point value and the shimmy frequency point value that are leached by controller; And above-mentioned acceleration point value filtered into voltage magnitude, convert the instantaneous acceleration numerical value that shows with the voltage signal amplitude to; 3. from measuring in the above-mentioned voltage magnitude, pick up counting M second 2≤M≤5; Use CPU through acceleration metering appearance and vibration transducer sample in each second sensing N instantaneous acceleration point value-a1, a2, a3 at least ... AN, N>=2, and with above-mentioned N instantaneous acceleration point value record at M all sensings in second, be back to CPU; Calculate mean acceleration ap=(a1+a2+a3+ second of per second with CPU ... + aN)/N; First second mean acceleration second is ap1, and the 2nd second mean acceleration second is ap2, by that analogy; Mean acceleration second of N second is apN; Try to achieve the final arithmetic mean value-all the period of time mean acceleration value apz=(ap1+ap2+ap3+ of pneumatic equipment blades made acceleration in second with CPU again at the M that limits ... + apM)/M, self clock surpasses M during second, and CPU stands limit acceleration value aS relatively to all the period of time mean acceleration value apz with maximum immediately: during as if apz>=aS; The electrical signal order that controller sends orderly closedown makes wind energy conversion system safety reduction of speed until parking through relay; If apz＜during aS, controller does not send the order of orderly closedown electrical signal, continues to make pneumatic equipment blades made to keep the start running.
The device that the present invention utilized comprises existing apparatus such as CPU, controller; But because blower fan MANUFACTURER during making blower fan, just encrypts control program or be cured in the hardware, so at first the circuit design and the alarm failure of blower fan are analyzed; Understand the signal mode of the collection point of fan trouble; Like switching value signal, current signal, voltage signal, resistance signal or the like, find out the pattern (orderly closedown, dead halt, emergency shutdown) of the shutdown that these faults cause simultaneously, select the signal of this vibration protection parallelly connected at last with hydraulic oil level sensor signal; Oscillating signal is after vibration module is handled; When touching its warning and reaching the standard grade, vibration module will make the switching value signal of one of relay output, and this switching value signal and hydraulic oil level sensor voltage of signals grade and size of current are suitable.
Owing to be protection, when finding that blade has problem, hope that blower fan can shut down as early as possible to blade; So be that signal is linked into the emergency shutdown loop in the embodiment of project application, but as blade protection, when finding that blade has problem; Fitness for purpose can just can find that the possibility of in time remedying is so just arranged at the problem initial stage, if blower fan is carried out the emergency shutdown loop; Owing to the powerful inertia that instantaneous stop produces, blade is further damaged, revise so revise original arrangement and method for construction; When vibration fault takes place, carry out the orderly closedown process, insert hydraulic oil level sensor signal and just can reach requirement.
Method of the present invention is utilized general vibration protection module, and carries out software programming according to Forecasting Methodology of the present invention, in conjunction with mathematical algorithm; Raising is to blade operating mode prediction accuracy and reliability; To practice thrift most the simple designs of cost, reach the purpose that realizes blade protection, realize finding the morning that blade is damaged; The purpose of early remedying reduces because blade damages the economic loss that causes to greatest extent.
(1) can explain its Forecasting Methodology through following specific embodiment: (1) known conditions (for example, can learn) according to the Campbell chart of TACKE600kW type unit to the blade movement operating mode: 19.5 meters blade natural frequency natural frequency flapwise (intrinsic flapping frequency) 1.7-1.75Hz, edgewise (shimmy frequency) 3.05-3.2 Hz is (according to foreign data; To be; Mainly be 600kW type unit) 23.2 meters blade natural frequencys: natural frequency flapwise (intrinsic flapping frequency) 1.71 Hz, edgewise (shimmy frequency) 2.88 Hz (what be directed against is production domesticization 750kW blower fan unit rule blade) are not difficult to find out according to above condition, from 19 meters to 23.2 meters fan blade; It is not very big that its natural frequency flapwise (intrinsic flapping frequency) changes; And edgewise (shimmy frequency) variation is bigger, and the length of blade of TACKE blower fan is 21.2 meters, because of the restriction of equipment and technical specifications; Can't measure particularly it; According to existing condition, can't measure, therefore; Temporary transient frequency according to 750KW blower fan standard type is set, and adjusts through actual conditions again.
(2) leaching corresponding to the signal in the same frequency segment in two natural frequencys of blade; The amplitude of confirming acceleration in this frequency then can not be greater than setting value: by the beaming limit of (glass fibre reinforced plastic material) blade with reverse limit decision; Realize that through controller digital filtering leaches concrete acceleration value; If the acceleration value of obtaining is greater than setting numerical value, the blade vibration monitoring module will be exported so, through WP2000 controller output stopping signal.
(3) about with the pneumatic excitation force of the harmonic component of 3 times of speed-frequencies (be called for short 3P) and the contrast situation of blade natural frequency; Three times of speed-frequency formula f=3*n/60, * is a multiplication sign, wherein n is a rotating speed; When wheel speed is respectively 0-25n/min; Three times of corresponding speed-frequencies are respectively 0-1.25 Hz, and 1.25 * 20%=0.25Hz, 1.25Hz+0.25Hz=1.5Hz < 1.7Hz; So it is little that the possibility of resonance takes place for three times of speed-frequencies of blade and blade natural frequency, this should carry out just confirming in Blade Design, the production process.So the vibration protection appearance is mainly still protected because the flutter that the aerodynamic force that changes causes.
(4) acceleration signal that is changed by sensor is transformed to voltage signal through sensor; Through the A/D sampling, get into controller again, be respectively the bandwidth filter of 1.7-1.75Hz and 3.05-3.2 Hz then through two frequency ranges; Leach this two-part voltage magnitude signal; In 5s, obtain mean value again, when mean value during greater than setting value, relay sends stopping signal.
The present invention can predict the operating mode of the blade of wind energy conversion system running in advance, according to blade movement is vibrated predicting the outcome of operating mode, makes blade shift to an earlier date stall, reaches blade is early found and the purpose of early remedying, and reduces to greatest extent because the economic loss that the blade damage causes.
Embodiment
A kind of the pneumatic equipment blades made condition of shaking is carried out the guard method of forecast analysis; A kind of to the pneumatic equipment blades made guard method that condition predicts of shaking; Comprise have the vibration monitoring module, the controller and the CPU of rotation speed monitoring module, relay, acceleration metering appearance and vibration transducer; The method step characteristic of its realization is: 1. utilize existing computational methods to wind power generation unit blade; In conjunction with the relevant performance parameter that wind energy conversion system blade of the same type has been tested out; Rotating speed according to the wind energy conversion system trouble free service; So that intrinsic flapping frequency interval value Fhx-Fhd and intrinsic shimmy range between a frequency value Fbx-Fbd when knowing the above-mentioned wind energy conversion system of the on-the-spot operation of having installed blade working of the same type; According to above-mentioned intrinsic flapping frequency interval value and intrinsic shimmy range between a frequency value, utilize the CPU correspondence frequency range to be set at digital bandwidth wave filter between the above-mentioned Fhx-Fhd and the digital bandwidth wave filter of frequency range between above-mentioned Fbx-Fbd, according to the beaming limit of pneumatic equipment blades made with reverse the maximum that the limit calculates above-mentioned blade of the same type and stand limit acceleration value aS; 2. will leach at flapping frequency point value between the Fhx-Fhd and the shimmy frequency point value between Fbx-Fbd at the digital bandwidth wave filter between the Fbx-Fbd at digital bandwidth wave filter between the Fhx-Fhd and frequency range by frequency range; And adopt digital filtering to try to achieve the relevant acceleration point value according to the flapping frequency point value and the shimmy frequency point value that are leached by controller; And above-mentioned acceleration point value filtered into voltage magnitude, convert the instantaneous acceleration numerical value that shows with the voltage signal amplitude to; 3. from measuring in the above-mentioned voltage magnitude, pick up counting M second 2≤M≤5; Use CPU through acceleration metering appearance and vibration transducer sample in each second sensing N instantaneous acceleration point value-a1, a2, a3 at least ... AN, N>=2, and with above-mentioned N instantaneous acceleration point value record at M all sensings in second, be back to CPU; Calculate mean acceleration ap=(a1+a2+a3+ second of per second with CPU ... + aN)/and N, first second mean acceleration second is ap1, the 2nd second mean acceleration second is ap2; By that analogy, mean acceleration second of N second is apN, tries to achieve the final arithmetic mean value-all the period of time mean acceleration value apz=(ap1+ap2+ap3+ of pneumatic equipment blades made acceleration in second at the M that limits with CPU again ... + apM)/M; Self clock surpasses M during second; CPU stands limit acceleration value aS relatively to all the period of time mean acceleration value apz and maximum immediately: if apz>=during aS, the electrical signal order that controller sends orderly closedown makes wind energy conversion system safety reduction of speed until parking through relay, if apz＜during aS; Controller does not send the order of orderly closedown electrical signal; Relay is failure to actuate, and continues to make pneumatic equipment blades made to keep the start running, but controller moment is accomplished the comparison procedure of above-mentioned apz＜aS; Obtain a result, and send the instruction of whether shutting down.
The present invention's sensing N instantaneous acceleration point value at least of sampling in each second; This N acceleration point value is the vibration acceleration momentary value; It can be identical in every adjacent two blanking times of quickening number of degrees instantaneous point value of each second; Also can be different, blanking time is identical then for pressing rule sampling vibration acceleration point value, and blanking time, difference was then for extracting at least two instantaneous vibration acceleration point values in each second at random.The number of second second instantaneous acceleration point value of surveying was 6 if the number of the instantaneous acceleration point value of surveying is 3 in first second, and the number that M surveys the instantaneous acceleration point value second is 10; Be per second survey the number of times of instantaneous acceleration point value can be identical, also can be different, per second surveys that it doesn't matter between the number of times of instantaneous acceleration point value; But per second will be surveyed twice or two instantaneous vibration acceleration point values at least, and the times N of measured instantaneous vibration acceleration point value is many more, certainly; The actual integer value of N can not be infinitely great, when selecting the actual integer value of N, and operating mode choose reasonable that should be concrete according to blade; Correspondingly, all the period of time mean acceleration value apz that finally calculates is just accurate more, therefore; According to the result sizes that apz and aS compare, just can predict more exactly, foresee blade whether will damage or foresee possibility controller that blade is about to damage can corresponding differentiation comparative result, if apz＜during aS; Controller will make pneumatic equipment blades made work on, do not shut down, when if apz >=during aS; Controller will make the pneumatic equipment blades made dead halt; The problem of the potential damage pneumatic equipment blades made of avoiding soon possibly occurring, thus reach the purpose of protecting blade better, play the prevention effect of preventing trouble before it happens conscientiously.
The parts that the present invention adopted are that existing TAC84 module (is produced by Denmark Dancontrol company
)Or existing OrbiVib module (producing by Denmark), can certainly be that other similarly can be the existing universal component that the present invention utilized.
The TAC84 module is the module that has two kinds of functions of vibration protection and rotating speed protection concurrently, and it comes measuring vibrations and measure rotating speed near switch through one through acceleration transducer, and the main feature of TAC84 module is: 1. adopt 11 pin BNC connectors; 2. module is inserted on the socket through the BNC connector on the housing; 3. vibration transducer adopts VS05e; 4. button and demonstration are arranged on the panel, show to comprise digital display screen and status indicator lamp; 5. use is comparatively general, technology maturation, highly versatile; 6. volume is less, is convenient to install; 7. control simple and easyly, reliability is higher.
The OrbiVib module is a low-frequency vibration monitoring modular, has the function of analog amount input and the output of control analog amount.Also be furnished with an external vibration sensor box, the function of vibration protection, rotating speed protection and temperature acquisition that the OrbiVib module is integrated, its panel main feature has: 1. an address toggle switch is arranged; 2. adopt standard guide rail electric box; 3. support the Profibus Field bus; 4. two digital quantity input ports that encoding function is arranged; 5. two relay outputs; 6. 8 PT100 temperature inputs; 7. can extend to 16 PT100 temperature inputs; 8. one two axis accelerometer of outside connection; 9. the safety protection function that is independent of the Profibus bus of standard; 10. the vibration transducer that uses is OrbiVib Sensor.
The vibration transducer that TAC84 and OrbiVib module adopt is respectively VS05e Sensor and OrbiVib Sensor, and through comparing the performance parameters of VS05e Sensor and OrbiVib Sensor, every kind of module all has different separately pluses and minuses.The TAC84 functions of modules is simple, and advantages of small volume has been passed through the check of time, and technology is comparatively ripe, highly versatile, and working environment adaptability is stronger, and functional reliability is higher.Belong to a kind of novel intelligent object, function is more, except the detection with vibration and rotating speed; Has the temperature acquisition function simultaneously; The Profibus Field bus is supported in the communication aspect, can directly check through blower fan PLC, but its volume is bigger; Sensor installation conditions and working environment are had relatively high expectations, and the stability of work also remains the textual criticism of time.According to the actual features of this project, requirement is through this device being installed, being realized the reliable and stable protection to fan blade; Functional requirement is fairly simple clear; Simultaneously, blower fan MANUFACTURER solidifies the program encryption of blower fan in process of production, is difficult to realize cracking it according to existing technical conditions; No matter be, use the OrbiVib module to realize that the possibility of this project is all less from the communication or the technical elements of control.Equally, consider, multi-functionally also mean increasing of investment, if use the OrbiVib module to realize that the possibility that extra function is utilized is also less on existing blower fan from establishing economic aspect.To sum up, the type selecting of this project equipment is intended and is adopted the TAC84 module to design.
Utilize TAC84 module and TACKE blade, the hardware and the parameter setting of assembling vibration protection: connect as follows according to the existing circuit diagram of TACKE blade: 1, the TAC84 pin connects; 2# line: 24VDC is (+) power line just; The 6# line: the vibration sensor signal line, insert vibration sensor signal; 8# line: vibration transducer+12V power line; 0# line: 24VDC negative supply (-) ground wire; The 11# line: the switching line when warning or newspaper sensor fault, insert No. 126 terminals of signal with the tooth fuel level in tank and link to each other.Vibration transducer is installed in the base plate position in cabin, is positioned at generator supporting base or cabin base plate vicinity and is difficult for the position that quilt is touched.
Owing to do not had space mounting TAC84 module in the former TB1 of TACKE unit, the existing TAC84 base is punched is installed on the side of cabin TB1, makes guard shield protection simultaneously.In this vibration-testing, do not use the rotating speed measuring ability in the TAC84 module,, promptly lost efficacy with the rotating speed measuring ability so parameter 7 is set to 0; According to the type of vibration transducer, that the offset of demarcating on the setting value of TAC84 parameter 13 and the vibration transducer is consistent.
Claims (1)
1. one kind is carried out the guard method of forecast analysis to the pneumatic equipment blades made condition of shaking; Comprise have the vibration monitoring module, the controller and the CPU of rotation speed monitoring module, relay, acceleration metering appearance and vibration transducer; The method step characteristic of its realization is: 1. utilize existing computational methods to wind power generation unit blade; In conjunction with the relevant performance parameter that wind energy conversion system blade of the same type has been tested out; Rotating speed according to the wind energy conversion system trouble free service; So that intrinsic flapping frequency interval value Fhx-Fhd and intrinsic shimmy range between a frequency value Fbx-Fbd when knowing the above-mentioned wind energy conversion system of the on-the-spot operation of having installed blade working of the same type; According to above-mentioned intrinsic flapping frequency interval value and intrinsic shimmy range between a frequency value, utilize the CPU correspondence frequency range to be set at digital bandwidth wave filter between the above-mentioned Fhx-Fhd and the digital bandwidth wave filter of frequency range between above-mentioned Fbx-Fbd, according to the beaming limit of pneumatic equipment blades made with reverse the maximum that the limit calculates above-mentioned blade of the same type and stand limit acceleration value aS; 2. will leach at flapping frequency point value between the Fhx-Fhd and the shimmy frequency point value between Fbx-Fbd at the digital bandwidth wave filter between the Fbx-Fbd at digital bandwidth wave filter between the Fhx-Fhd and frequency range by frequency range; And adopt digital filtering to try to achieve the relevant acceleration point value according to the flapping frequency point value and the shimmy frequency point value that are leached by controller; And above-mentioned acceleration point value filtered into voltage magnitude, convert the instantaneous acceleration numerical value that shows with the voltage signal amplitude to; 3. from measuring in the above-mentioned voltage magnitude, pick up counting M second 2≤M≤5; Use CPU through acceleration metering appearance and vibration transducer sample in each second sensing N instantaneous acceleration point value-a1, a2, a3 at least ... AN, N>=2, and with above-mentioned N instantaneous acceleration point value record at M all sensings in second, be back to CPU; Calculate mean acceleration ap=(a1+a2+a3+ second of per second with CPU ... + aN)/N; First second mean acceleration second is ap1, and the 2nd second mean acceleration second is ap2, by that analogy; Mean acceleration second of N second is apN; Try to achieve the final arithmetic mean value-all the period of time mean acceleration value apz=(ap1+ap2+ap3+ of pneumatic equipment blades made acceleration in second with CPU again at the M that limits ... + apM)/M, self clock surpasses M during second, and CPU stands limit acceleration value aS relatively to all the period of time mean acceleration value apz with maximum immediately: during as if apz>=aS; The electrical signal order that controller sends orderly closedown makes wind energy conversion system safety reduction of speed until parking through relay; If apz＜during aS, controller does not send the order of orderly closedown electrical signal, continues to make pneumatic equipment blades made to keep the start running.
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| CN103291549A (en) * | 2012-02-29 | 2013-09-11 | 南通大学 | Electromechanical coordinating and restraining method of rotary spindle chattering by utilization of two-shaft tilt sensor |
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| DK178952B1 (en) * | 2013-08-19 | 2017-06-26 | Gen Electric | Methods and systems for detecting damage to the wind turbine rotor blade |
| CN107061185A (en) * | 2017-04-14 | 2017-08-18 | 广州特种承压设备检测研究院 | A kind of pneumatic equipment bladess state monitoring method and system based on vibration detection and transmission of wireless signals |
| CN107255978A (en) * | 2017-05-27 | 2017-10-17 | 中国大唐集团科学技术研究院有限公司 | Method for visually monitoring, apparatus and system based on CFD flow field analyses |
| CN108254147A (en) * | 2018-01-22 | 2018-07-06 | 浙江大学 | Shake table feedback signal frequency-division section amplitude modulation system |
| CN112884727A (en) * | 2021-01-28 | 2021-06-01 | 华北电力大学（保定） | Wind turbine blade vibration monitoring method |
| CN112966207A (en) * | 2021-01-28 | 2021-06-15 | 北京清源能控科技有限公司 | Vibration monitoring method based on image acquisition |
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| CN103291549A (en) * | 2012-02-29 | 2013-09-11 | 南通大学 | Electromechanical coordinating and restraining method of rotary spindle chattering by utilization of two-shaft tilt sensor |
| DK178952B1 (en) * | 2013-08-19 | 2017-06-26 | Gen Electric | Methods and systems for detecting damage to the wind turbine rotor blade |
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| CN107061185A (en) * | 2017-04-14 | 2017-08-18 | 广州特种承压设备检测研究院 | A kind of pneumatic equipment bladess state monitoring method and system based on vibration detection and transmission of wireless signals |
| CN107061185B (en) * | 2017-04-14 | 2019-09-17 | 广州特种承压设备检测研究院 | A kind of pneumatic equipment bladess state monitoring method and system based on vibration detection and wireless signal transmission |
| CN107255978A (en) * | 2017-05-27 | 2017-10-17 | 中国大唐集团科学技术研究院有限公司 | Method for visually monitoring, apparatus and system based on CFD flow field analyses |
| CN107255978B (en) * | 2017-05-27 | 2019-11-08 | 中国大唐集团科学技术研究院有限公司 | Method for visually monitoring, apparatus and system based on CFD flow field analysis |
| CN108254147A (en) * | 2018-01-22 | 2018-07-06 | 浙江大学 | Shake table feedback signal frequency-division section amplitude modulation system |
| CN108254147B (en) * | 2018-01-22 | 2023-09-12 | 浙江大学 | Frequency-division amplitude modulation system for feedback signal of vibrating table |
| CN112884727A (en) * | 2021-01-28 | 2021-06-01 | 华北电力大学（保定） | Wind turbine blade vibration monitoring method |
| CN112966207A (en) * | 2021-01-28 | 2021-06-15 | 北京清源能控科技有限公司 | Vibration monitoring method based on image acquisition |
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