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最新刊期
卷 51 ， 期 12 ， 2022
- 摘要：Main control system is the control core of wind turbine, but its domestic independence is very low, and the external dependence is relatively large, which is the weakest link in wind turbine equipment. On the basis of analyzing the current situation of localization of wind power main control system, the design, development and application of Huaneng Revival Wind Power PLC system was introduced. It is the first batch of 100% domestic wind power main control systems in China. Aiming at solving the problems of poor software and hardware adaptability and lack of CAN open modules, a domestic wind power PLC module with core chips such as CPU and FPGA was designed, and the domestic CAN open communication module was developed. Test by an authoritative third party shows that it has fully met the actual needs of functional performance and reliability indicators of the localized wind power main control system of wind turbines. The demonstration application of onshore 2 MW,offshore 5 MW wind turbines and the batch application of onshore 1.5 MW wind turbines show that, the wind power main control system has strong real-time performance, high environmental adaptability and anti-electromagnetic interference capabilities. It fully satisfies the application requirements of various wind turbines, indicating that the control core of wind turbines in China has achieved full autonomy and controllability.关键词：wind power unit;main control system;Huaneng Revival Wind Power PLC;domestic independence;development and application44|162|0更新时间：2025-09-28
- 摘要：Thermal power units have implemented a series of transformation under the goals of “carbon neutrality and carbon peaking”. These transformation measures include: various measures for energy conservation and consumption reduction, the transformation of large flow heat supply and industrial steam extraction, flexible operation for thermal power units, and the adoption of AC series compensation and UHVDC transmission technology for long-distance transmission. With the implementation of these measures, the safety and reliability problems of steam turbine and auxiliary equipment become increasingly prominent. Based on the field cases and experiences, this paper systematically summarizes the mechanism and characteristics of typical faults, such as the shafting vibration of main and auxiliary equipment, rotor cracks and rotating parts fall off, vibration and corrosion of long turbine blades, stuck and vibration of steam inlet valve, and so on. Moreover, corresponding countermeasures are given to provide technical support for the safe and stable operation of thermal power units under the current situation.关键词：thermal power unit;deep peak load regulation;large flow heating;vibration;rotor crack10|236|4更新时间：2025-09-28
- 摘要：Blades are the key load-bearing components that convert wind energy into electric energy. The complex forces, high failure rate and high maintenance cost have always been prominent problems restricting the safety and economy of wind turbines. To improve the development of in-service safety guarantee technology for wind turbine blades, the commonly used monitoring methods for blades are reviewed according to the monitoring principle. The commonly used blades monitoring methods can be divided into two types: the contact monitoring methods based on vibration signal and mechanical waves, and the non-contact monitoring methods based on thermodynamics and optics. The contact monitoring methods determine the safety state of the blade through the time-frequency,frequency spectrum and other information of the blade vibration signal or the strain energy released when the blade is damaged. The non-contact monitoring methods can be divided into infrared thermal imaging, laser Doppler velocimetry and computer vision monitoring methods. The research progeress and application status of various blade monitoring mthods are presented. Finally, suggestions and prospects are put forward for the application of blade condition monitoring methods in actual wind turbines.关键词：wind turbine;blades;condition monitoring;contact monitoring;non-contact monitoring8|338|6更新时间：2025-09-28
- 摘要：In order to solve the problem that the diagnostic accuracy of current gas turbine gas path faults based on data-driven needs to be improved, a gas path fault diagnosis method based on parallel optimization of dual-channel feature fusion is proposed. Firstly, a gas turbine thermodynamic model is used to construct a sample set of gas path fault data. Secondly, convolutional neural network and long and short term memory neural network are used to mine the spatial and temporal features of the data in parallel, and the optimization methods of the first layer large convolutional kernel and squeeze excitation network are introduced in the two channels respectively. Finally, the features extracted from the two channels are fused into a one-dimensional tensor and then reconstructed into the fully connected layer for gas path fault type identification. The experimental results show that, the proposed method has better recognition accuracy than the conventional machine learning and deep learning gas path fault diagnosis methods, with an average diagnosis accuracy of 98.24%, which is practical and feasible.关键词：gas turbine;gas path fault diagnosis;convolutional neural network;long and short term memory neural network;feature fusion;parallel optimization16|138|2更新时间：2025-09-28
- 摘要：Power plant equipment condition monitoring based on sound signal is a new type of equipment condition fault diagnosis technology. The high noise environment of power plant is the technical difficulty to be solved in the application of this technology. Aiming at solving the problem of sound recognition of power plant equipment in high noise environment, a fusion feature generation method of power plant equipment sound based on Mel frequency cepstrum coefficient(MFCC) and gamma tone frequency cepstrum coefficient(GFCC) is proposed to realize accurate recognition of different equipment operation sounds. Firstly, the 96-channel sound imager is used to collect the sound signals of 6 kinds of equipment in operation in the high noise environment of the power plant,and preprocess the sound signals to obtain multi-frame sample signals. Then, MFCC and GFCC are applied to extract the features of the preprocessed audio signal to obtain the original high-dimensional features. In order to eliminate the influence of noise and reduce the feature dimension, principal component analysis(PCA), de-noise automatic encoder(DAE) and t-SNE algorithm are respectively used to reduce the dimension of the original highdimensional features, calculate the separability criterion function value of the corresponding category, and fuse the reduced dimension features in the same dimension reduction method to obtain the fused features. Finally, Gaussian white noise is added to the data set, and support vector machine algorithm is used for equipment voice recognition based on the fusion features to verify the accuracy and robustness of the fusion features. The experimental results show that, the fusion features have both the accuracy of MFCC features and the robustness of GFCC features.Compared with the MFCC and GFCC feature extraction methods before and after dimension reduction, the recognition success rate has been significantly improved, which can provide a theoretical basis for the further research of power plant equipment condition monitoring and fault warning methods.关键词：condition monitoring;fault diagnosis;sound recognition;fusion features;denoising;dimension reduction8|233|0更新时间：2025-09-28
- 摘要：In order to better evaluate the steam-flow exciting vibration of cooling pipe and improve the safety guarantee of power unit condenser, the steam flow in the throat and on the shell side of the condenser is numerically simulated respectively. The steam flow on the shell side was simulated with the outlet flow field of the throat as the inlet condition. Based on the distribution of the flow field on the shell side of the condenser, the critical cross velocity and risk coefficient are calculated to distinguish the steam-flow exciting vibration, so as to complete the evaluation of the steam-flow exciting vibration of the cooling pipe. The simulation results show that, the risk coefficient of steam-flow exciting vibration at the peripheral cooling pipe of the “tree” bundle module above both sides of the condenser is about 1.2, indicating there has a great possibility of steam-flow exciting vibration. The evaluated steam-flow exciting vibration position is consistent with the vibration failure position of the condenser cooling pipe. This method can make a more specific and detailed evaluation of the condenser cooling pipe on the cross section of the tube bundle.关键词：condenser;cooling pipe;flow field on the shell side;steam-flow exciting vibration;numerical simulation8|78|0更新时间：2025-09-28
- 摘要：Surge is a harmful fault of induced draft fan in power station while the lack of fault data restricts the identification and prevention of surge. The overall model of induced draft fan as well as its upstream and downstream duct and equipment is established based on simulation software Apros, and the surge simulation test is carried out after verifying the accuracy of the model. Precursory characteristics of induced draft fan surge are analyzed according to the test results. The simulation test results show that, greater flue resistance leads to shorter surge period. When the resistance occurs upstream of the induced draft fan, the space from the resistance area to the end of the duct on one side will store and release mass alternately during surge, while the storage mass in areas upstream of the resistance area is basically unchanged. The change of flow parameters at different positions of the duct can be used as precursor features to identify surge. When the downstream resistance of the induced draft fan increases, the surge occurs in the space from the back of the dust collector to the end of the duct on one side. The identification of surge depends on the monitoring of the flow parameters at each position in this area. The flow on both sides can compensate each other, and excessive resistance of public duct will cause surge of fans on both sides.关键词：Apros;induced draft fan;surge;precursory characteristics11|92|1更新时间：2025-09-28
- 摘要：The vibration frequency of the last stage long turbine blade with self-locking shoulder is different due to the different contact states and contact stress of the working surface at different rotating speeds, which presents typical non-linear characteristics, and resulting in certain difficulties in numerical analysis for the turbine blade vibration characteristics. In this paper, the finite element contact method is used to analyze the contact area, contact stress and other contact states of a low-pressure last stage long blade at different rotating speeds, and then the vibration characteristics of the blade system at different pitch diameters and different orders are analyzed. Finally,the “3-coincide point” resonance frequency and resonance speed of the blade in the rotating speed range of 1 300～3 200 r/min are measured in the dynamic balance chamber by using the radio non-contact testing method, and the results are compared with the numerical results. The comparison shows that, the experimental results are consistent with the numerical calculation results, and the 880 mm blade-disk system does not have “3-coincide point”resonance near the working speed.关键词：steam turbine;blade;finite element;dynamic frequency;resonance speed14|78|0更新时间：2025-09-28
- 摘要：The desuperheater is an important means to ensure the safety of superheater and reheater heating surface,but the input of desuperheater will seriously affect the economy of the unit. Through wall temperature characteristic test of screen superheater, high temperature superheater and high temperature reheater, and on the premise of ensuring the safety of heating surface pipes, several suggestions were proposed, such as rising the the trigger temperature of desuperheating water and decreasing the water quantity of desuperheating water. At the same time,the delay time of desuperheating water spraying was observed, and it was considered that the service time of desuperheating water spraying should take into account the delay time of desuperheating water spraying and pay close attention to the variation trend of reheat steam temperature. It found out that, increasing the temperature of water spraying and optimizing the service time of water spraying can both reduce the amount of desuperheating water, greatly improve the economy of boiler operation, prevent the desuperheater pipeline from being subjected to frequent thermal shock, and ensure the safety of heating surface pipes. This method has good application effect.关键词：reheater;desuperheating water;tube wall temperature;trigger temperature;delay time;water spraying way20|44|0更新时间：2025-09-28
- 摘要：The reason for speed jump fault of turbine magneto resistance speed measurement is complex and the treatment is very difficult. This paper analyzes the general characteristics of the speed detection circuit in the form of a case, and makes an in-depth study on the generation mechanism of the jump of the magneto resistive speed measurement speed signal. The results show that, most of the reasons for the jump are the poor matching between the speed measurement gear and the magneto resistive sensor. Under the action of the shaft vibration of the steam turbine, the speed signal generates zero crossing harmonic. When the amplitude of the zero crossing harmonic is greater than the threshold of the detection circuit, the speed jumps, and the magnitude of the speed jump is related to the number of zero crossing harmonics exceeding the threshold. A new method of correcting speed jump with capacitance is proposed, and its feasibility is theoretically analyzed. Moreover, the key points of the implementation process of this method are explained.关键词：magneto resistive velocimetry;speed jump;zero crossing harmonic;capacitance correction10|23|0更新时间：2025-09-28
- 摘要：In order to solve the problem of frequent failures of coal mills in coal-fired power stations, a fault early warning method based on multi-state estimation(MSET) and vector similarity is proposed. Taking the mediumspeed coal mill of a 350 MW unit as the research object, the key parameters that can characterize its operating status are selected, the historical data containing fault information is collected, and the data set is divided. The process memory matrix is established on the training set data by equal-spacing sampling method, and the observation vector is input into the MSET model to obtain its corresponding estimation vector. At the same time, the similarity function of the two is defined, and the early warning threshold is determined by the sliding window method. At last, the actual operation data is used to carry out verification, and the results show that, when the coal mill runs normally,the average relative error of the input model data prediction is below 1%. When the coal jamming fault occurs in the coal mill, the model can detect the abnormal operation of the coal mill in time and issue an alarm 380 s before tripping. It is proved that the model can accurately predict the change trend of various parameters and realize the rapid and accurate intelligent early warning of coal mill failures.关键词：medium-speed coal mill;process memory matrix;multi-state estimation;average similarity;early fault warning19|183|4更新时间：2025-09-28
- 摘要：Under the combined action of steam flow disturbance and unbalanced centrifugal force, unstable synchronous vibration is easy to occur during the operation of high and intermediate pressure rotors of high parameter steam turbines. Through theoretical derivation of the vibration control equation of rotor bearing system,the influence mechanism of steam flow disturbance on the unbalanced response of steam turbine rotor is analyzed,and then the fault diagnosis and treatment methods of unstable synchronous vibration are summarized. The vibration treatment cases of two 300 MW-level steam turbine generator units are introduced in detail, which verifies the proposed treatment strategy. The field treatment of such vibration faults can be carried out by enhancing system stability, alleviating steam flow disturbance and reducing mass unbalance. When the measures such as adjusting the bearing elevation and changing the opening sequence of high-pressure regulating valve are invalid, the unstable synchronous vibration of high and intermediate pressure rotor can be reduced through on-site precision dynamic balance.关键词：steam turbine rotor;steam flow disturbance;mass imbalance;fault diagnosis;dynamic balancing9|93|0更新时间：2025-09-28
- 摘要：The flow-induced vibration will cause structure damage and failure for heat exchanger. By taking the tubular gas-gas heat exchanger vibration in an ultra-supercritical 660 MW coal-fired generator unit as an example,the vibration modes of multi-span U-fin tube and tubular gas-gas heat exchanger were analyzed by ANSYS finite element analysis method, and the natural frequency of the heat exchange tube bundle was calculated. The effects of vortex shedding, turbulent buffeting and acoustic resonance on the vibration of tubular gas-gas heat exchanger were analyzed. The results indicate that, the acoustic resonance induced by vortex shedding or turbulent buffeting is the root cause of the tubular gas-gas heat exchanger vibration. On this basis, the corresponding vibration control method is put forward, and the effective vibration elimination effect is achieved in practical engineering.关键词：tubular gas-gas heat exchanger;flow-induced vibration;finite element analysis;vibration elimination16|156|0更新时间：2025-09-28
- 摘要：Based on large amounts of field dynamic balance test data, the dynamic balance methods of asymmetric high-pressure rotor, unsupported medium pressure rotor and single supported low-pressure rotor used in the supercritical or ultra supercritical turbine produced by ALSTOM technology are studied. The results show that,there is a serious non orthogonal problem in the vibration mode of high pressure rotor, and the interference coefficient of vibration mode must be considered in the dynamic balance calculation. The first-order unbalance condition of the intermediate pressure rotor can be identified according to the vibration peak value and phase relationship at the No.1 and No.2 bearings in critical speed region. At a constant speed of 3 000 r/min, the firstorder or second-order unbalance condition of the intermediate pressure rotor can be inferred from the vibration amplitude and phase relationship at the No.2 and No.3 bearings. The unsupported side of the low pressure rotor can identify and decompose the unbalanced vibration mode by using the vibration information of adjacent bearings.关键词：steam turbine;vibration;unbalance condition;rotor;bearing19|51|0更新时间：2025-09-28
- 摘要：The surface coating of the moving blade in the first stage of a gas turbine peeled off, and fatigue cracks occurred at the trailing edge adapter R. To solve thiese problems, failure analysis was performed, and the failure mechanism was discussed. Firstly, investigations were carried out on the failure blades, including the visual observations, material composition analysis, and microstructure analysis. Then, the temperature field and stress field distribution on the blade was simulated. The results show that, sulfur and vanadium in heavy oil will form sulfates and vanadates after combustion, due to local high temperature, these sulfates and vanadates passes through the gap in the ceramic insulation layer and reacts with the material, thus making the surface coating peel off. The high temperature region obtained by CFD analysis is consistent with the spalling region of coating. The results obtained by mechanical simulation show that, the stress level is high at the tailing edge, and fatigue cracks occurr at the tailing edge adapter R by frequent start and stop. Based on the research results, the dominant fatigue mechanism in the root is concluded to be corrosion-fatigue, and reasonable suggestions are put forward for the use of turbine blades.关键词：gas turbine;failure analysis;physical and chemical analysis;blade external heat transfer;blade stress simulation;corrosion-fatigue28|245|0更新时间：2025-09-28
- 摘要：Aiming at solving the problems of inaccurate measurement and short service life of SO_2 electrochemical gas sensor in monitoring air pollutants around thermal power plants, by taking the fly ash from a gangue-fired power plant in Shuozhou, Shanxi Province as the research object, and based on the analysis of the morphological characteristics of fly ash, the settling speed of fly ash and the amount of deposition at different times were obtained through theoretical calculation, and the influence of fly ash on the measurement error of SO_2 sensor was tested by experiments. The results show that, the diameter distribution range of the fly ash is 4～10 μm, the settling velocity of the fly ash is 2.25×10-3 m/s and the deposition amount in one day is 1.55 mg. The deposition time of fly ash will affect the measurement error of the sensor, the longer the deposition time, the greater the measurement deviation of the sensor. The reason is that the deposition of fly ash leads to the reduction of gas diffusion area s and diffusion coefficient K of the electrochemical sensor. Under the condition of fly ash deposition, the greater the gas mass concentration, the faster the gas reaches the working electrode area, the higher the effective SO_2 concentration detected in the limited response time, and the smaller the measurement error of the sensor. When the SO_2 electrochemical sensor is used in the environment with a large amount of fly ash, it is recommended to install a filter membrane with pore diameter less than 4 μm to prevent dust and clean the deposited fly ash regularly.关键词：air pollution monitoring;SO_2 electrochemical sensor;sedimentation speed;fly ash from thermal power plant;morphology scanning6|61|1更新时间：2025-09-28
- 摘要：The differential pressure type steam flow measurement instrument has large calculation error under variable working conditions. To solve this problem, relevant analysis and research is carried out, and it points out that, under variable working conditions, the revised calculating coefficients of the differential pressure type steam flow measurement instrument change greatly, and the fixed correction coefficients of the existing measurement correction scheme cannot meet the engineering requirements, so it is necessary to re-calculate iteratively. Combined with theoretical calculation and engineering application experience, in view of the optimization calculation and logic configuration of various correction coefficients under variable working conditions, a simplified modified calculation method which is suitable for engineering application is proposed, which effectively improves the measuring accuracy of the differential pressure type steam flow measuring instrument under variable operating conditions and meets the practical requirements of engineering.关键词：variable working condition;steam flow;measurement;engineering application12|47|0更新时间：2025-09-28
- 摘要：A full-scale three-dimensional heat transfer model is established for a typical blade air thermal deicing system, and the convection of solid coupling heat transfer process is simulated and observed. At the same time, the one-dimensional heat transfer model is simplified and constructed, and the influence of key parameters such as ambient temperature on the temperature of deicing air flow is explored. On the basis of BP neural network, the corresponding relationship between the environmental conditions and the minimum deicing air flow temperature is established. The results show that, under the comprehensive influence of the blade layer structure and the blade channel arrangement, the air thermal deicing at the middle of the blade leading edge is the most difficult. With the help of BP neural network, the rapid calculation and prediction of the minimum deicing air flow temperature under different conditions can be realized. The multi-factor weight analysis shows that, the environmental temperature and the thermal conductivity of PVC material are the two key parameters affecting the minimum deicing air flow temperature. For deicing in the range of 0.2r～r, the blade length is also a key parameter affecting the minimum deicing air flow temperature, with influence weight up to 14.3%.关键词：wind power generation;air thermal deicing;heat transfer optimization;BP neural network9|257|2更新时间：2025-09-28
- 摘要：The main shaft assembly runout of wind turbine is a kind of fault mode with high frequency and great fault harm in wind farms. At present, the method for detecting the runout displacement of the main shaft assembly in wind farm has the shortcomings of low detection efficiency and poor measurement accuracy. To solve this problem, an efficient on-line monitoring technology for detecting the runout displacement of the main shaft assembly is proposed, and the corresponding monitoring device and early warning system is developed to realize the real-time and on-line monitoring of the runout displacement of the main shaft assembly. The monitoring data of the main shaft assembly runout is obtained by installing laser displacement sensor reasonably, and then the data is analyzed by time series prediction method, and the ARMA model of the main shaft assembly runout is established.The actual application shows that, by predicting the development trend of the runout displacement of the main shaft assembly, the runout state of the main shaft assembly can be grasped in time and its abnormality or deterioration trend can be detected in advance, thus the early warning information can be given when it is judged that the main shaft assembly is likely to have runout fault. Therefore, the generation and spread of the runout fault can be avoided and the safe and stable operation of wind turbine can be ensured.关键词：wind turbine;main shaft assembly;axial runout displacement;ARMA model;fault warning23|100|1更新时间：2025-09-28
- 摘要：Nuclear power turbine island operation capability is very important for nuclear power units, but little research has been done on nuclear power turbine island operation simulation and rotor stress. In order to realize the analysis of rotor stress and simulation under island operation in nuclear power turbine, 100% PN and 50%PN load shedding to island operation conditions in a nuclear power turbine is simulated based on MATLAB and the rotor stress under both conditions is numerically simulated based on ANSYS, focusing on the simulation results of the speed rise, the centrifugal stress field of the rotor at the highest speed under both conditions and the transient thermal stress field of the rotor during the island operation. The results show that, under 100%PN load shedding to island operation condition, the maximum speed rise reaches 1 574.78 r/min and the maximum centrifugal stress reaches 168.09 MPa, which occurs at the end of the medium-pressure stage. The thermal stress increases gradually with time, and the maximum stress appears at the root of the turbine wheel after the second stage of the high pressure rotor. The maximum stress value is less than the permissible stress of the rotor material at the corresponding temperature, and the two island operation conditions are safe.关键词：nuclear power turbine;island operation;turbine rotor;stress;simulation11|60|0更新时间：2025-09-28
- 摘要：To investigate the excitation sources and transfer path of turbo-generator components, an operational transfer path analysis(OTPA) model is established by using the vibration data of generator components under stable operating conditions as input and output signals. Then, singular value decomposition(SVD) technology is used to solve the transfer rate matrix. It is determined that the model does not omit important excitation source and transfer path by multi-coherence analysis based on partial coherence function. The accuracy of the model is verified by comparing the synthesized signal with measured signal. Based on the OTPA model, the effective vibration contribution of different excitation points to target points is analyzed. The excitation source contribution factor is proposed to analyze the contribution of different excitation sources to target points.Two turbo-generators in a nuclear power station suffered serious vibration fault. Considering overhaul plans of the nuclear power station, the comprehensive treatment measures for vibration fault are formulated by using the OTPA. It shows that the vibration faults of the two generators are successfully eliminated. The application of the OTPA method can improve the efficiency of generator vibration fault treatment.关键词：nuclear power unit;turbo-generator;vibration;OTPA;excitation source;contribution factor6|67|1更新时间：2025-09-28
- 摘要：Effective early warning of main bearing failures in wind turbines is a key issue to improve their reliability and availability. In order to find out wind turbine main bearing faults in time and avoid greater loss, an XGBoostKDE-based wind turbine main shaft bearing temperature prediction and fault warning method is proposed. The relevant characteristic parameters in supervisory control and data acquisition(SCADA) system are selected as input variables to predict the main bearing temperature under normal operating conditions of the wind turbine, and the residuals between the predicted value and the operating data during normal operation are obtained. Afterward, the non-parametric kernel density estimation(KDE) method is applied to determine the residual warning threshold, and the sliding window analysis method is combined to achieve the main bearing fault warning of the wind turbine.Moreover, a 2 MW-level wind turbine is used as the research object, and the operating data in the SCADA system is read for verification. The experimental results show that, this method can predict the main bearing temperature under normal operating conditions with accuracy of 97.6%, respond to the fluctuation of the temperature curve when the main bearing fails, and give an effective warning signal to the main bearing failure of the wind turbine nearly one month in advance.关键词：wind turbine main bearings;fault warning;XGBoost;kernel density estimation;sliding window analysis16|261|4更新时间：2025-09-28
- 摘要：Various typical vibration faults of Arabelle half speed nuclear power turbo-generator unit, the main type of nuclear power turbo-generator in China, are analyzed, including some unique vibration faults. Through a large number of field experimental studies on 24 units, the mechanism and characteristics of common vibration faults of Arabelle turbo-generator, such as dynamic and static friction, high pressure and intermediate pressure rotor vibration climbing during rising power, mass(thermal) unbalance, structural resonance of vibration sensor supporting bracket of generator, insufficient bolt tightening force of coupling, and long period vibration fluctuation of shaft system, are analyzed and summarized. Moreover, the on-site treatment measures for different vibration faults are also proposed.It can provide a reference for vibration fault diagnosis and treatment of Arabelle nuclear power turbo-generator units.关键词：Arabelle;nuclear power unit;turbo-generator unit;vibration fault;field experiment17|45|0更新时间：2025-09-28
- 摘要：At present, the fault diagnosis of wind turbines relies heavily on diagnostic analysts. For large-scale wind turbine groups, it is difficult to ensure the accuracy and efficiency of diagnosis by relying solely on manual analysis.In order to solve this problem, the automatic diagnosis method of typical faults of wind turbine bearing based on sweep frequency analysis technology is applied in the large-scale fault diagnosis of wind turbine group, the conditions for implementing the large-scale application are analyzed, the actual application results in Huaneng renewable energy smart operation and maintenance system are introduced, and the development of smart diagnosis technology is prospected in combination with the actual needs of maintenance personnel. The automatic diagnosis method has achieved preliminary results in application, which reduces the dependence on manual diagnosis to a certain extent, and provides effective technical means and valuable practical experience for large-scale fault diagnosis of wind turbine groups.关键词：wind turbine unit;sweep frequency analysis;automatic diagnosis;large-scale fault diagnosis;smart operation and maintenance9|71|1更新时间：2025-09-28
- 摘要：In view of the fracture of laser repaired main shaft of a wind turbine, several tests and analysis methods were carried out for the samples, such as macro inspection, chemical composition analysis, room temperature tensile test, room temperature impact test, brittle transition temperature test, metallographic analysis, cladding size measurement, hardness test and fracture scanning electron microscope analysis. The results show that, the matrix material and deposition quality of the shaft sample were unqualified, and the fracture property of the sample was high cycle fatigue fracture in multi-source areas. These source areas located on the outer wall of the heat affected zone adjacent to the cladding layer. The main cause of the shaft fatigue fracture was the poor performance of the cladding heat affected zone.关键词：wind turbine unit;main shaft;deposition quality;multi-source area;high cycle fatigue fracture11|78|2更新时间：2025-09-28
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