Photoelectric Transmission Study Of Strain Test Of Rotating Parts

In the operation failure of mainstream doubly-fed wind turbines,the proportion of gearbox failure is the highest.The optimal design of wind turbine gearbox can reduce the occurrence of faults.The root strain test method calculates the tooth load distribution of gears through the root stress waveform.Coefficient and load non-uniformity factor can provide accurate technical guidance for the gearbox's gear shaping technology and load sharing performance evaluation,increasing the life of the gearbox.The traditional measurement of the root stress data mainly relies on the contact type slip ring.The increase of the single machine power of the wind turbine makes the limitation of data transmission by the slip ring more and more.In this paper,the traditional slip ring contact type data transmission method is further improved,and a rotating part strain test photoelectric transmission system is designed.The photoelectric data non-contact technology is used for strain data transmission.It is proposed to carry out specific design and experimental verification for each module of the system.Firstly,according to the requirements of current non-contact signal transmission technology and the comparison of transmission modes,the advantages of optoelectronic non-contact data transmission are highlighted,and the overall scheme of the rotating part strain test system is proposed.In the current optical modulation method,the average transmission power is adopted.The comparison of the three aspects of average bandwidth demand and transmission capacity clarifies the advantages of using the OOK optical modulation method.Secondly,according to the functional requirements of the strain test,the relevant hardware circuit design is made for the strain test photoelectric transmission system,including the strain measurement circuit and the amplification module,the light emission circuit,the light receiving circuit,the power supply circuit and the communication link under different working conditions.The design;its complete optoelectronic transmission channel lays the foundation for data transmission.Thirdly,according to the design of strain system and the transmission requirements of strain data,the experimental platform of strain test system is built,and the reasonable photoelectric transmission controller and optical communication frame format structure are selected to design the rotating side and fixed side main control modules.In the design of the side main control module,a method of capturing the synchronization header and identifying the data bit by using the eCAP module of the DSP and the Manchester data encoding method 'is proposed.Finally,using LabVIEW to write the upper computer strain data monitoring interface,the strain data display and data storage are realized;in the overall operation of the strain test system,compared with the slip ring data transmission,the correctness of the photoelectric data transmission is verified,and the photoelectric data is performed.Communication performance test of different transmission distance and reception angle.