X-ray Thickness Gauge Hardware Design And Measurement Data Analysis

Rolling of strip steel has always been an important part of the rolling process in the steel industry.In the rolling of strip steel,the strip thickness is an important indicator to measure the strip quality.The value of strip thickness plays a decisive role in the quality of the steel strip.Therefore,the measurement accuracy of the thickness gauge will have a direct impact on the quality of the strip steel,thus laying an important position in the AGC system(automatic thickness control system).Among the numerous thickness gauges in the market,X-ray thickness gauges have a wide range of applications due to their high measurement accuracy,high signal-to-noise ratio and many other characteristics.In X-ray thickness gauges,traditional X-ray thickness gauges use industrial control computers for data acquisition,which are relatively expensive and relatively complex in structure.In the rolling process of the strip steel,the irregular shape of the roll and the roll bearing will cause the non-circularity of the roll itself,and at the same time,the geometric axis of the roll body will be separated from the axis of rotation.The eccentric disturbance of the roller will cause the roll gap to produce high-frequency cyclical changes during the actual operation,which will cause a certain periodic deviation in the thickness of the strip outlet.In summary,this article will introduce the design process of the thickness gage data acquisition system in detail,and will study the eccentric disturbance and noise signals in the strip outlet thickness.The following is a detailed study of this article:(1)The X-ray thickness gauge data acquisition system was designed,and the hardware part of the X-ray thickness gauge data acquisition system was described in detail.Each module(ADC module,DAC module,etc.)in the X-ray thickness gauge data acquisition system was described separately.DI module,DO module and WIFI module)design and function selection.In addition,for the main functions of the system software part,how to implement software programming for data acquisition on the ARM control board and download program functions online are also introduced.(2)For different noises in the strip thickness,use the four filtering methods:inertial filtering,mean filtering,high-pass filtering,and autocorrelation filtering to process the signals.Then simulate the results in the MATLAB platform to obtain the filtering results.The filtering effect of the method ultimately reduces the effect of noise on thickness measurements.(3)Introduce the formation of roller eccentricity and its mathematical model.The content includes:using least squares parameter estimation method to identify the parameters in the eccentric perturbation model,and finally obtain the eccentric perturbation model;the adaptive notch filter recognizes the fixed frequency eccentric perturbation signals in multiple signals through step-by-step identification;The SFT calculates the signal FFT more quickly according to the sparseness of the signal frequency domain.On the premise of knowing the approximate frequency of the eccentric disturbance signal,in order to reduce the workload,a regional DFT method is proposed to identify the signal spectrum on-line;according to the foregoing work,identification is performed.The presence of field data compensates for eccentric disturbances and eventually achieves the goal of increasing strip outlet thickness accuracy.