SU1483347A1 - Method for monitoring physiomechanical properties of ferromagnetic articles - Google Patents

Abstract

The invention relates to nondestructive testing of physical and mechanical parameters of ferromagnetic materials and products and improves the accuracy of the control. This is achieved by introducing between the controller 1 magnetizing current and generator 3 magnetizing current of an analog-digital divider 2 connected to blocks 11.16 of digital processing and control, which allows varying the magnet current from the output of generator 3 depending on the digital code at the input of the analog - digital divider 2, coming from the digital processing unit 11 by the signal of the control unit 16. Introduction of a field sensor located inside the compensation winding 4 of the converter, and connecting its output to the first input of the switch 8, allows the control unit 16 to connect the output of the field sensor 7 to the input of the analog-to-digital converter 9 and thereby measure the current value of the field polarity. The combination of these blocks in accordance with the program of operation of the digital processing unit 11 provides stabilization of the magnetization field of the measuring transducer. The use of the second and third blocks 13, 14 of the discrete sample memory, the digital-to-analog converter 15, and the differential amplifier 6 connected to the control blocks 16.11, digital processing, the transmitter and the switch 8, allows automatic electronic compensation of the high initial level of the signal from reference product as when changing the magnetisation current value in the process of adaptive search for the optimal magnetization current, and at a constant magnetisation current value in the process of learning and control. 1 il.

Description

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3, depending on the digital code at the input of the analog-digital divider 2, coming from the digital processing unit 11 on the signal of the control unit 16. Introduction of a field sensor located inside the compensation winding 4 of the converter, and connecting its output to the first input of the switch 8, allows the control unit 16 to connect the output of the field sensor 7 to the input of the analog-digital converter 9 and thereby measure the current value of the field polarity. The combination of these blocks in. In accordance with the program of operation of the digital processing unit 11, stabilizes the magnetization field of the measuring transducer. The use of the second 13 and third 14 discrete sample memory blocks, a digital-analog converter 15 and a differential device, or a cell 6 connected to the control and digital processing blocks 16, 11 by the measuring converter and the switch 8, allows automatic electronic compensation of a high initial level signal from the reference product, both when the magnitude of the magnetizing current changes during the adaptive search for the optimal magnetization current and at a constant magnitude of the magnetizing current in , 1 EUCES learning and control. 1 il.

The invention relates to the non-destructive control of the physical and mechanical properties of ferromagnetic materials and can be used in machine building to control the quality of heat treatment of products.

The purpose of the invention is to improve the accuracy of control due to the stabilization of the intensity of the measuring floor

converter and automatic. ktronnoy compensation signal measuring transducer from the reference product.

The drawing shows a block diagram of a device for monitoring the physico-mechanical properties of ferromagnetic products.

The device contains a magnetizing current controller 1 connected in series, a controlled analogue, a digital divider 2, a magnetizing current generator 3, a measuring transducer consisting of two identical windings: a compensation 4 and a measuring 5, which are connected in series-counter, and a differential amplifier 6. The device also contains series-connected magnetization field sensor 7, placed inside the compensation winding 4, switch 8, the second and third inputs of which are connected to the outputs differential amplifier

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6 and the measuring converter, respectively, analog-to-digital converter 9, first block 10 of discrete sample memory, block 1 1 digital-4 signal processing and indicator 12, second block 13 of discrete sample memory, the first input of which is connected to the output of analog-digital the converter 9, and the output to the second input of the digital signal processing unit 11, connected in series to the third discrete sample memory block 14, the first input of which is connected to the output of the block 11, and the digital-to-analog converter 15, whose output is connected En to the second input of the differential amplifier 6, as well as the control unit 16, the outputs of which are connected respectively to the second input of the first memory block 10, the third input of the analog-digital divider 2, the second input of which is connected to the second output of the digital signal processing unit 11, the fourth input the switch 8, the second input of the second memory block 13, the second input of the analog-digital converter 9f, the third input of the block 11, the second input of the indicator 12 and the second input of the third memory block 14.

The device operates as follows

The Compensation cycle is initially carried out, providing electronic compensation for a high initial level of an arbitrary waveform from a reference product. For this, the magnetizing current controller 1 provides, at the output of the magnetizing current generator 3, a sinusoidal magnetizing current of a certain magnitude / amplitude and a frequent, i, exciting measuring transducer. Since the compensation 4 and measuring 5 windings are connected in series-counter and are made identical, there is no signal from the output of the measuring converter. When installed in the winding 5 of the measuring converter of the reference sample, an unbalance signal of complex shape appears at the output of the measuring converter, which is fed to the first input of the differential amplifier 6 and the second input of the switch 8. The program of the computing system of the device is designed so that in the Compensation cycle control unit 16 permits only the input to the second input of the switch 8 to pass through the input of the analog-digital converter 9. The analog-digital converter 9 converts the output One analog signal of a complex form from a reference product into a double parallel code of the corresponding size, which enters the computer system, is further recorded from the output of the digital processing block 11 into the third block 14 of the discrete sampling memory, and in the form of a digital code goes to the digital input digital the log converter 15, and from its analog output - to the second input of the differential amplifier 6. The compensation cycle is completed at the command of the control unit 16 by supplying a control signal enabling walking the analog-to-digital converter 9 of the difference signal coming from the output of the differential amplifier 6 to the third input of the switch 8. Thus, upon completion of the cycle compensation in the third memory block 14, the waveform of the measuring converter from the reference product is recorded in the form of discrete samples, and The output of the digital-to-analog converter 15 is again restored as an analog signal.

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This is followed by a cycle of stabilizing the field of magnetization. The sensor 7 field is located inside the winding 4 and permanently records the magnitude of the magnetic field strength of the measuring transducer created by the magnetizing current. An analog signal from the sensor 7 output is fed to the first input of the switch 8. At the command of the control unit 16, the sensor signal of the floor 7 is fed to the input of the analog-digital converter 9 and is recorded as a digital code in the second discrete-sample memory block 13. In accordance with the work program of the computing system, digital processing unit 11 periodically compares the current value of the sensor field strength with the recorded digital code in the second discrete sample memory block 13 and provides a differential code to the input of the controlled analog-digital divider 2 to adjust the magnetisation current value .

Then the Learning cycle is performed.

Samples from a representative training set are alternately placed into the measuring winding 5 of the measuring converter. The initial analogue-4 signals from the training samples and the reference product are fed to the first and second inputs of the differential amplifier 6. The difference signal through the third input of the switch 8 is fed to the input of the analog-digital pre-g generator 9 and recorded as a digital code in the first block 10 discrete sample memory. Upon completion of the sampling of the original signal of the measuring converter of the training sample of samples, the control unit 16 switches the operation of the device to the calculation of the spectral components in the basis of trigonometric functions. The results of calculations of the spectral components, together with the corresponding physico-mechanical parameters of the samples from the training sample, are recorded in the RAM of the digital processing unit 11. Thereafter, the AND processing unit performs a correlation-regression analysis of training results in order to select the functional relationship between the physicomechanical indicators of the ferromagnetic product and the spectral composition of the signan of a complex shape of the measuring transducer, determine the estimates of the coefficients of the regression equation, multiple correlation coefficient and standard error physicomechanical indicators. In an adaptive search for the optimal form of magnetizing current, the Compensation, Stabilization of the Magnetization Field, and Training cycles are repeated. In the second block 13 and the third block 14 of the discrete sample memory, the digital codes of the signals of the reference product and the sensor 7 field are automatically overwritten. At the output of the magnetizing current controller 1, a probing effect is provided such that the multiple correlation coefficient has a maximum value for a particular training set.

In the Measurement cycle for each sample being measured, the difference signal from the output of differential amplifier 6 is fed to the third input of switch 8 and, at the command of control unit 16, passes to the input of analog-digital converter 9. After sampling the informative signal, the resulting set of discrete samples is written to the first block 10 discrete sample memory. In accordance with the work program of the computing system, the digital processing unit 11 performs functional transformations to calculate the required physical and mechanical parameters set in a cycle. Training a control model, namely, comparing the current value of the field strength of sensor 7 with a given code, calculating the spectral components and conducting correlation-regression analysis of learning outcomes. The results of calculations in the corresponding units of measurement of physicomechanical indicators are fed to the input of indicator 12.

The application of the proposed device provides a high stability of the probing effect on the control object, the formation of the range of changes of the informative signal that is optimal for discretization, the possibility of excluding from the procedure a functional transformation of the initial level of a different set of physical and mechanical parameters of ferromagnetic products, which increases the accuracy of measuring the physical and mechanical parameters ferromagnetic steel.

Claims (1)

Invention Formula A device for monitoring the physicomechanical properties of ferromagnetic products, containing a magnetizing current controller, a series-connected generator and a measuring converter, serially connected analog-to-digital converter and the first discrete-sample memory block, switch, control unit connected to the second input the first block of discrete sample memory, and the series-connected digital signal processing unit and the indicator, which are different in that, in order to increase the accuracy control, it is equipped with between the output of the magnetization current controller and the control input of the generator by an analog-digital divider, the second and third inputs of which are connected respectively to the second output of the digital signal processing unit and the second output of the control unit, a differential amplifier, the first input of which is connected to the output of the measuring converter, a magnetization sensor The output of which is connected to the first input of the switch, the second, third and fourth inputs of which are connected respectively to the outputs of the differential y ilitel, the sensor and the third output of the control unit, and the switch output - to the input of an analog-digital transformation the body, the second discrete sample memory block, the first and second inputs of which are connected respectively to the output of the analog-digital converter and the fourth output of the control unit; the fifth, sixth and seventh outputs of which are connected respectively to the second input of the analog-digital converter, first input of the digital block signal processing and the second input of the indicator, and serially connected third block of memory of discrete samples, the first and second inputs of which are connected respectively to the eighth output of the unit pack AB 9 148334710 the second output of the block is digital-but to the outputs of the first and second blocks of signal processing, and the digital-memory, measuring transducer by a low-voltage transducer, the output of which is performed with two consecutively connected to the second input of the diff-windings a second amplifier and a compensation one, and the third inputs of the digital processing unit of the magnetizing field are placed. The signal’s grandchildren are connected to three compensation windings.