1 Introduction In the case of grid disturbance or impact load, the turbine generator set will be excited by the unbalanced torque to excite the shaft torsional vibration. If the torsional vibration amplitude exceeds the allowable value, it will cause fatigue damage of the shafting, even Caused a vicious accident Therefore, the analysis of the wire-line monitoring of the turbo-generator shaft torsional vibration is related to the major course of the steam turbine generator set. Muwen introduces the newly developed turbo-generator shaft-axis torsional vibration line monitoring and analysis system. After analyzing the principle and signal processing method of rotating shaft torsional vibration by time pulse method, the structural composition and function analysis of the system are elaborated. The principle of 2 time pulse method torsional vibration measurement and signal processing to obtain a series of pulse trains generated by aliquots or non-UM aliquoting gears mounted on shaft 1, and the method of analyzing the shaft torsional vibration signals is to use the number of crystal oscillators to determine each pulse. The interval time is compared with the pulse interval of the flat angular velocity without torsional vibration. The torsional vibration information of the rotating shaft is obtained from s1fflSSJSJas to eliminate the interference of bending vibration on the torsional vibration measurement. The method 1 of dual sensor pickup can be used. The principle of measuring the torsional vibration of the rotating shaft by the time pulse method is to rotate the shaft for one week, and the mean angle violation is called. The time is then forward or backward in the time of the twist angle is 2.1 time pulse method torsional vibration measurement principle discretization processing after the pulse timing method is to limit the output signal of the sensor, discretization into a dense and rectangular rectangular wave, using a single-chip microcomputer 51 parts. Under the action of the internal clock, the rectangular wave is continuously counted into the hall. It is assumed that the time interval of the counting pulse is 1, then 1 = person. =7 2.2 Processing and analysis of torsional vibration signal 22.1 Characteristics of torsional vibration sampling number and processing The torsional vibration signal contains components with the same frequency or frequency multiplication as the rotational speed, but the frequency of the torsional vibration component is not related to the rotational speed, so it cannot be The whole period of each torsional vibration component is intercepted to reduce the fence effect during spectrum analysis, which can increase the number of samples of the signal; because the torsional vibration frequency of the turbine generator set shaft system is low, this does not require a very high sampling speed. Chen is a gradual decay process. If the signal of the attenuation torsional vibration process is segmented and analyzed by 1 and the amplitude variation of the same frequency component between the segments is compared, the amplitude attenuation coefficient at each frequency can be calculated, and then the modal damping is obtained. The digital rejection of the 22.2 pulse down-interference is performed by the average difference method. The interference value can be eliminated and replaced. The adjacent points of the sampled data are first subtracted, the sum of the absolute bits is obtained, and then the sum is divided by And the number of points, to get the average difference, it is necessary to set a certain threshold. If the difference between two adjacent points exceeds the threshold, it is noise. At this time, the average value of the same phase point in the other cycles of the signal can be replaced. That point. In addition, the digital filtering of the collected data can also be used to achieve a better effect of 22.3 quantization error analysis to the enterprise-level Jia 8 server, which can realize the remote monitoring and expert consultation of the turbo-generator shafting torsional vibration system 4 Functional analysis 4.1 Sensor part Sensor part The measurement signal of the pick-up and transmission system of the production site includes high-temperature cylinder temperature and pressure generator phase current voltage generator excitation current and torsional vibration, etc. 4.2 Data acquisition part of the data acquisition part mainly comes from Real-time acquisition and preliminary data processing of various signals on the site, and some characteristic parameters are sent to the database server. When the torsion angle amplitude changes into the state parameter, the data acquisition station is only responsible for real-time acquisition and calculation of torque torsion. Angle, some characteristic parameters are sent to the database server at a fixed time, and the real-time data of a fixed length of time is saved; and the torsion angle amplitude or state parameter exceeds the set threshold. The data collection station will collect the real-time data of the set, merge it with the real-time data before the state change, and send it to the database server, and the engineer station is responsible for handling the fault event. 4.3 The server part of the server part includes the database server and the boundary 6 server. The database server is responsible for the torsional vibration data of all units in the whole plant, including real-time data and historical data from the server's main negatives torsional vibration real-time data and fault analysis. 4.4 Engineer station part of the engineering station is the analysis and calculation center of the whole system. Once the torsional vibration fault occurs, the analysis software of the engineering station will be illusory, and the analysis number will be measured from the ten database and the Soviet device. In the middle, the internal clock is used to count the gear pulse train to determine the time to turn a tooth, and the end error is avoided as the northing error. The relative error of the system is based on the distributed design idea, using the field bus and the network. The technology builds a real-time network of torsional vibration online monitoring and analysis, and realizes the whole plant sharing of torsional vibration data. With the increasing use of the Internet, the structure of the three systems consists of the sensor system data acquisition system. The unit shaft torsional vibration monitoring and analysis system is pushed to the network and remote scale monitoring, which will surely be the future development trend. The severity of the large-scale steam turbine generator shaft shaft torsional vibration damage is frequently sent to the station 8 and the database. According to the distributed design idea, the sensor system is responsible for the capture and transmission of the on-site port, and it counts the number of acquisition systems. The control level operator station 8 server and the database server together form the on-site management level. With the nature and latency, it has gradually been recognized and valued by the peers of the domestic and international power systems. One person and one unit are stable and reliable.å¿In the initial stage, it is imperative to solve the calculation of electromagnetic torque and shafting torsional vibration response, study the torsional stress life curve and torsional stress check method of unit structure, and determine the complex LAN mode group between life loss and various influencing factors. network. The system is connected to the enterprise LAN to form a subnet of the enterprise network, so as to realize the whole plant sharing of the torsional vibration related data; if the local area network; Will, 1; the internal friction of the server is coupled along the sensitive fiber, and the slight fluctuation of the fiber in the fiber will cause a small amount of light pulse energy to occur at the Rayleigh scattering-based scattering at any position of the sensitive fiber. This scattering is divided into front scatter and backward, and both. The first scattered light will propagate along the front of the fiber, while in the backward direction, the light will return along the fiber to the incident end of the sensitive fiber, the coupler. In the backward direction, the light will enter, 19, the photodetector is detected, along the upward direction of the fiber, the starting position of the return of the light is determined by the equation 2, and the time delay of the propagation of the light pulse from the fiber injection end to the bit 2 is such. The engine-only distributed fiber micro-bend strain sensor system passes through one sensitive fiber. A plurality of micro-inch sensors can be used to monitor the bridge structure strain field in real time online. At some points 8, 8 large strains appear. According to the return, the optical power loss curve, that is, the waveform of the ruler. In order to know the location of the large strain and the magnitude of the strain, when the strain exceeds the threshold, the alarm signal is given by the 6-stage treatment circuit. If the bridge structure breaks somewhere, the sensitive fiber breaks. In the 8th fiber, there is a breakpoint at 1000,1, and the pinch waveform can be quickly found to find the breakpoint, which provides a basis and convenience for the maintenance of the engineering structure. 5 Conclusions A new structure is suitable for various strain measurement sensors. The sensor strain optical power loss curve is based on the simulation test of the bridge structure distributed strain field monitoring system based on 0 technology. Good test results are obtained. Continued on page 270 2 Zhang Xiaoling, Tang Xikuan. Research on shaft torsion angle and torsional vibration testing technology. Tsinghua University 3 Gu Yu, Yang Kun, He Chengbing. Simulation of Torsional Vibration Characteristics of Turbogenerator Based on End Network Method. China Mechanical Engineering, 1999, 105540542.
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