Study On The Method Of Refractory Brick Interior Defect Diagnosis And Design System

Along with the progress and development of the high temperature industrial technology, quality of the refractory is also getting higher and higher, especially the refractory brick has been applied massively in ferrous metallurgy industry, its quality and life relate to the safety and economic efficiency of ferrous metallurgy industry. The technique of refractory brick has formed, but the technique of testing the interior quality fault of the refractory brick has not been developed, until now, the overwhelming refractory diagnosis method is backward. In this paper striking method is adopted to testing the interior quality fault of the refractory brick, according to refractory brick striking sound it is judged if there are defects and differentiate the type of the fault.In order to diagnosis the interior quality fault of the refractory brick, it needs to obtain the useful data information from the rap sound signal. Firstly, it uses finite impulse response (FIR) digital filtering technique. On the other hand, striking sound is a series of interval signal, adopting double threshold comparison method to judge the start and ending points of striking sound, then to get the extracted signals. Extracted signals are time-domain signal without obvious regulation and it cannot be used to detect defects. Appling Welch method to estimate the power spectrum and then detecting by spectrum data, nevertheless, peak points are energy concentrations in one signal, and there are correlation within peak points of the same spectrum. We can extract peak points to be used characteristic data in refractory brick interior quality fault diagnosis. Above methods have the characteristics that computes rapidly and meet real-time demand of online detection.This paper puts forward and experiences an effective method of interior defect diagnosis of refractory brick based on the fisher discriminate analysis which uses characteristic data. The author discovered the lack of fisher discriminate by analyzing method through it is used, it is normal class which has led characteristic value decomposition, it caused the differentiate which is not obviously between the flaw class. In view of the above situation it proposed the interior defect diagnosis method of refractory brick based on PCA-FDA mixed model. After these, the author took test on simulation of these means, and gained better defect test and diagnose result, explained that the method may apply in the actual system.Digital signal processor (DSP) has the formidable ability of signal processing, it may be competent to the online detection definitely. The author chooses the component according to the actual need, definite the module and the function, designs the electric circuit connection of each module, completes the schematic diagram and the PCB, as well as make the hardware. Compiles the C language based on the processing algorithm during the theory research stage, designs main program to make the system dispatching each subroutine program reasonably under the no-operation system. Operator can connect the system by the keyboard and LCD. The interior defect diagnosis system of refractory brick has the characteristics of stable, fast, operating simply, function completed and meeting the demand of online detection completely.