Flexible Sensor Network Based Impact-monitoring Technique For Wind Turbine Blade

With the development of society,wind power generation has become one of the most widely used new energy technologies.However,wind turbines are mostly built in desert,Gobi and other areas with poor natural conditions,where the natural conditions are relatively harsh,and they are more susceptible to lightning,sand and other impact damage.In order to ensure the safe operation of wind turbine structure and reduce maintenance costs,it is of great significance to study the online health monitoring of wind turbine structure.Passive Lamb wave structural damage monitoring technology is one of the research hotspots in the field of structural health monitoring.Based on the intelligent spray sensing technology,the wind turbine blade structure is taken as an example to study the impact damage monitoring and location of composite wind turbine blade structure.The main work of the paper is as follows:Firstly,the research status of passive Lamb wave structure health monitoring technology and the problems of impact monitoring based on piezoelectric sensor network are analyzed.For example,when using a piezoelectric sensor to arrange a sensor network,it is necessary to use glue to paste it.After a period of time,it is easy to fall off.The lead connected to the piezoelectric piece may affect the operation of the structure.Therefore,this paper uses new sensors to overcome the defects of piezoelectric sensors.Secondly,the basic principle and preparation of the intelligent spray sensor,the sensing mechanism and the arrangement method of the sensor network are introduced.According to the classification of Lamb wave structure health monitoring technology,combined with the characteristics of wind turbine blade structure,this paper chooses passive Lamb wave structure health monitoring technology.Moreover,the principle of spraying the sensor is described,and the positioning algorithm is determined.Thirdly,the framework of composite structure impact monitoring system based on intelligent spray sensor network is designed,includes receiving response signal,adjusting and amplifying signal circuit,data acquisition and signal processing and analysis,The signal conditioning module is mainly designed and developed to realize the amplification of the collected response signal.Finally,the wind turbine blade composite structure model is taken as the object,and the research method and monitoring system are verified by experiments.The verification content is: comparing the performance of the piezoelectric sheet and the smart spray sensor when processing the response signal,and comparing the experimental positioning result with the actual damage result to determine whether the new monitoring method is effective.The research and experimental verification results show that the composite material impact monitoring system and method based on intelligent spray sensor network research in this subject can achieve the monitoring effect of traditional monitoring methods.The intelligent spray sensor has good sensing capability and can detect the location of impact damage more accurately.At the same time,the monitoring method using new sensor materials and new technology proposed in this paper makes up for some defects in the application field of traditional passive Lamb wave structure health monitoring technology,and expands the application range of structural health monitoring technology to a certain extent.