1 INTRODUCTION In the case of grid disturbances or shock loads, the turbogenerator set will be excited by the unbalanced torque and cause the torsional vibration of the shaftshaft. If the torsional vibration amplitude exceeds the allowable value, it will lead to fatigue damage to the shaftline, even As a result of a vicious accident, the analysis of the line monitoring of the torsional vibration of the turbo-generator shafting system has a bearing on the major courses of the turbine generator unit An Lingyun.
Mu Wen introduced the newly developed monitoring and analysis system for the torsional vibration of turbine generator shafts. After analyzing the principle and signal processing methods of the torsional vibration of rotating shafts with the time pulse method, the structure and function analysis of the system are described in detail. 2 Time pulse method torsional vibration measurement principle and signal processing to obtain a series of pulse trains mounted on the shaft 1 of the equidistant or not UM equally divided gears, from the analysis of the shaft torsional vibration signal method using the number of crystal oscillator to determine each pulse The interval time is compared with the pulse interval of the steady angular velocity without torsional vibration. The torsional vibration information of the rotation axis is obtained from s1fflSSJSJas to eliminate the interference of the bending vibration to the torsional vibration measurement. The method of dual sensor pick-up can be used. The principle of the time-pulse method for measuring the torsional vibration of the shaft is a one-week rotation of the ancestral axis.
Time is in the time forward or backward twist angle 2.1 Time pulse method Torsional vibration measurement principle Discretization processing after the pulse timing method is to limit the sensor output signal shaping, discretized into a dense rectangular wave, using single-chip microcomputer 51 components. Under the action of the internal clock, continuous counting of the entrance of the rectangular wave into the hall assumes that the counting pulse is at the interval 1 , then 1 = person. =7 2.2 Torsional Vibration Signal Processing and Analysis 22.1 Torsional Vibration Sample No. Features and Processing Torsional vibration signal contains components with the same frequency or frequency as the rotational speed, but the frequency and rotational speed of the torsional vibration component are irrelevant. The torsional vibration component is taken over the entire period to reduce the barrier effect during spectrum analysis and increase the sampling number of the signal; as the torsional vibration frequency of the turbine generator shaft system is low, this does not require a very high sampling speed. Chen is a gradually decaying process. If the signal of the damping torsional vibration is segmented and analyzed, and the amplitude of the same frequency component is compared between each segment, the amplitude attenuation coefficient at each frequency can be calculated and the modal damping can be obtained. The digital culling of the 22.2 impulse down-sampling method uses the average difference method to eliminate and replace the perturbed values. First, the adjacent points of the sampled data are subtracted from each other, the sum of the non-paid bits is found, and then the sum is divided by the demand. And the number of points, get the average difference to set a certain threshold must be, if the difference between a neighboring two points exceeds the threshold, which is noise, this time can replace the average of the same phase point in the signal several other cycles This point. In addition, the digital filtering of the collected data can also achieve better performance 22.3 quantification error analysis to the enterprise-class Jia 8 server, can realize the remote monitoring and expert consultation of the turbine generator shaft torsional vibration system 4 system Functional Analysis 4.1 Sensor Part The sensor part is negative. The measurement signal of the picking and delivery system of your production site includes the high school cylinder temperature pressure generator phase current voltage generator excitation current and torsional vibration, number, etc. 4.2 Data Acquisition Section Data Acquisition Section Main Pair The real-time collection of various signals at the scene and the preliminary data processing, and some of the characteristic parameters are sent to the database server at the same time. When the torsion angle changes into the state parameter, the data acquisition station is only responsible for the real-time acquisition and calculation of the torque torque. Angular, send certain characteristic parameters to the database server at a regular time, and save the real-time data for a fixed length of time; if the torsion angle or state parameter exceeds the set threshold. The data acquisition station will collect the real-time data of the setup and send it to the database server after being merged with the real-time data before the status change. The engineer station will be responsible for handling the fault event. 4.3 The server part The server part includes the database server and the sector 6 server.
The database server is responsible for the torsional vibration data of all units of the plant, including real-time data and historical data from the server's main stock torsional vibration real-time data and fault analysis and analysis.
4.4 Engineer station Some engineer station is the analysis and calculation center of the entire system. Once the torsional vibration fault occurs, the analysis station of the engineer station changes motion. The analysis data is from the ten database and the Soviet Union. The time pulse method is used to measure the torsional vibration process. The internal clock is used to count the gear train pulse to determine the time when the tooth is turned. The end of the error is not saved as the Hangbei error. The relative error is based on the distributed design idea of ​​the system, using the field bus and calling the network. The technology has built a real-time network for online monitoring and analysis of torsional vibration, enabling the whole plant sharing of torsional vibration data. With the increasingly widespread application of the Internet, the structure of the 3 system consists of the structure of the system including the sensor system data acquisition system. The monitoring and analysis system of the torsional vibration of the unit shaftshaft is pushed towards the network and the remote monitoring of the scales will surely be a trend in the future. The seriousness of the torsional vibration destruction of the shaft of the large turbogenerator set is frequently sent to the Chenggong station Jia 8 server and database. According to the distributed design idea of ​​the server, etc., the sensor system is responsible for the capture and transmission of the on-site ports. It checks the number of acquisition systems and starts the process. ! The Controlling Engineer Station 8 server and database server together form the site management level. With its sexuality and potentiality, it has gradually been recognized and valued by its counterparts in the domestic and foreign power systems. The stability and reliability of the 1 unit and 1 crew are stable. In the initial stage, it is imperative to solve the calculation of the electromagnetic torque and the torsional vibration response of the shafting system. Study the torsional stress life curve and the torsional stress check method for the unit structure and determine the multi-LAN mode group between the life loss and various influencing factors. network. The system is hooked up to the enterprise LAN to form a subnet of the enterprise network to realize the whole plant sharing of the torsional vibration related data; if the LAN is connected, the LAN is connected. The internal coupling of the servers will propagate along the sensitive fiber, and the small fluctuations of the fiber in the fiber will cause a small part of the optical pulse energy to be scattered by Rayleigh scattering at any position of the sensitive fiber. This evanescent scattering is divided into forward scattering and backward, shooting two. The first scattered light will be propagated along the front of the fiber, and the backward light will be returned along the fiber to the incident end of the sensitive fiber through the coupler. In the backward direction, the incident light will enter. 19, the photodetector is detected. Along the upward direction of the optical fiber, the initial position of the return light is determined by 1 and the time delay of the optical pulse from the fiber injection end to the bit 2 propagation is determined. The engine, the only technology distributed fiber microbend strain sensor system passes through a sensitive fiber. With multiple micro-pound sensors, it is possible to monitor the bridge strain field into the hall in real time. At some points 8,8 there is a large strain. According to the return, the optical power loss curve is the waveform curve of the instrument. In order to know the location of the large strain and the magnitude of the strain, when the strain exceeds the threshold, a warning signal is given by the treatment of Tuen Mun Road 6. If the bridge structure breaks somewhere, the sensitive fiber breaks. 8 The optical fiber has break points at 1000 and 1 and can quickly find the break point of the crucible structure according to the Claw waveform curve, which provides a basis and convenience for the maintenance of the engineering structure. 5 Conclusions The new structure of the sensor is suitable for various strain measurement sensors. Strain Optical Power Loss Curve of Sensor Based on the Zero-Technology Simulation Test of Bridge Structure Distribution Strain Field Monitoring System Obtained Good Test Results = 270. 2 Zhang Xiaoling, Tang Xikuan. Spindle twist angle and torsional vibration test technology. Tsinghua University 3 Gu Wei, Yang Kun, He Chengbing. Torsional Vibration Simulation of Turbogenerator Based on End Network Method . China Mechanical Engineering, 1999, 105540542.
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