Method of determining metrological characteristics and reliability of matrix vortex-current converter

FIELD: non-destructive testing.

SUBSTANCE: calibrated voltages of maximum value corresponding to the maximum variation of one of the physical parameters are applied to the outputs of the coils of the matrix converter. The calibrated voltage is modulated simultaneously by the sum of calibrated voltages of the permissible values. The voltages are applied continuously until the corresponding converter output failure. The time period from the beginning of the voltage apply to the failure is recognized as total service life of the matrix converter to be tested.

EFFECT: enhanced accuracy of determining.

1 dwg

 

The invention relates to techniques for non-destructive multiparameter control, namely the technology of metrological support matrix eddy current probes of the physical parameters, and is intended for calibration and Metrology expertise, reliability and complete resource matrix eddy current probes in extreme conditions climatic and mechanical environmental influences.

Known methods of determining the metrological performance matrix eddy current probe, which consists in the fact that the transducer is put on multivariate calibration stand on a given gap opposite the reference sample, excite coil inductance (sensitive items) Converter switching current of variable frequency, then the reference sample slip through discrete segments sequentially in mutually perpendicular directions relative to the axis of the centering of the transducer and the sample, which allows for the simulation of changes in physical parameters of the field inspection object, the procedure is repeated at different gaps between the matrix Converter and the sample, then register output signals of the inverter and build according to these signals from changes in the values of the physical parameters to evaluate the metrological show the lei calibrated Converter [RF Patent №2082641, BI No. 18. 1997].

The main disadvantages of the methods are: functional limitation of the calibration matrix converters only metrological performance in static conditions, the stability of which is not reliable for the dynamics; the procedure for calibration of the transducer needs to be repeated periodically practically before each new cycle of the control field of multiparameter object that is economically costly. In addition, the methods do not allow us to determine the operational reliability and the full resource of verified Converter.

Known methods of determining the reliability matrix eddy current probes, namely, that the matrix Converter is installed in a climatic chamber, excite coil inductance matrix Converter switching current of variable frequency, make the camera conditions, adequate changes in individual factors from the external environment, then register with each of the outputs of the Converter changes the output electrical signals from each of the factors, build the appropriate dependencies, which assess the reliability of the calibrated transducer, the maximum values of the factors, simulating the external environment, set the camera values is not more than the maximum of deputysydney, specified in the technical conditions of verified Converter [GOST 20.57.406-81. Testing methods. M.: Publishing house of standards, 1981].

These methods in Metrology known as public or interagency climatic and mechanical tests, which expose all commercially available instrumentation. Such testing is carried out prior to operation of the measuring device in the production of once, i.e. when the device is handed over to the customer. To climatic and mechanical environmental factors include: temperature changes in the range typical for the regions of the Russian Federation (from -60 to +60°C), rain, humidity, air flow and solid elektroprovodyashchimi and oil inclusions, with icing designs eddy current probe and the snow drift control zone and other Such environment is characterized, for example, when monitoring physical parameters of objects of railway transport on the go train in areas with extreme environmental conditions.

These methods are not without drawbacks. They do not allow to provide the conditions for the simultaneous impact of changing factors, adequate the actual environmental conditions, and consequently, to determine the full resource device. The complete resource is the sum of real and residual operational resources. Real life is calculated approximately by known analytical dependences and its value is entered in a technical condition of this measuring device. Normally, the estimated actual resource measuring device installed on the test object, is never exhausted, for example, due to unaccounted time of shutdown of the controlled technical facility for repair or maintenance work, in which the device does not work (resting). Here and there is a residual resource for device non-destructive testing. In addition, the residual resource is still not determined, so the authors of the now established methods of analytical calculation, which is currently being tested [1].

The closest technical solution to the claimed is the method of determining the metrological performance matrix eddy current probe in a dynamic operating conditions, namely, that the inductance matrix Converter excite the switching current of variable frequency, influence of electromagnetic and turn simultaneously on all coils of the inverter by changing the value of the calibrated voltage, equivalent to the largest and simulating the change of ODA is defined physical parameter of the natural sample, repeat the procedure effect on the inductance of the Converter changing other calibrated electric stresses that mimic other physical parameters of the natural sample, build according to the output signals of verified Converter from changes in each of the strains that mimic physical parameters, and are judged by the dependency on metrological performance (accuracy, sensitivity) calibrated Converter [RF Patent №2082640. BI No. 18, 1997].

The method is interesting because it does not require regular or periodic use of multiparameter bench equipment, and its advantage is that information, once received on the bench equipment with the reference patterns and exemplary matrix eddy current transducer is stored in the form of a reference system, which contains data about the change of each of the measured physical parameters, expressed as changes in the calibrated voltages. Here, under the physical parameter means: move, gap, defect with its characteristics, electrical properties, etc. Each of many physical parameters, expressed in the calibrated voltages, electromagnetic influences on verified Converter, and reference the system at the same time automatically according to a given program to form modified by the calibrated value of the electric voltage in accordance with changes in one or another parameter or factor. On the other hand, the method is limited in functionality, as it allows to determine the full operating life test matrix eddy current probe in extreme environmental conditions.

The technical result, which directed this solution is the simulation of changes in physical parameters of the field object and environmental factors electromagnetic calibrated voltage and the possibility of determining the full service life under extreme climatic and mechanical effects that, in General, when using the new technology will ensure the quality and reliability of controlled multiparameter objects especially responsible, especially tehnoobshow destination. When this new technology is cost-effective because it requires constant test bench equipment and special climatic chambers, initiating a change in the physical parameters of the field of object control, and environmental factors.

The invention consists in that in the method of determining the metrological performance and reliability matrix eddy current probe in a dynamic operating conditions, which consists in the excitation of the coils about ascuaga matrix Converter switching current of variable frequency, in placing an exemplary matrix Converter first on multiparameter bench, then in a climatic chamber and in both cases, a separate removal from the outputs of the exemplary matrix Converter dependency changes the output electrical signals from each of the n physical parameters of the reference samples and each of m environmental factors, respectively, and the reference experimental data store and create thereon software for automated calibration and subsequent matrix converters, allowing alternating electromagnetic effects simultaneously on all coils tested matrix Converter by changing the value of the calibrated electric voltages simulating the change of each physical parameter of the reference sample and each separately the environmental factor, and the limits of change of the calibrated voltage is selected to change the physical parameters from minimum to maximum values, and factors from normal to maximum permissible values specified in the technical specifications to test the Converter, and upon the results of the automated checking build characteristics change vs the x output electric signals of verified Converter depending on the changes individually calibrated voltages, simulating n physical parameters and m environmental factors, analyze the dependence on the physical parameters and environmental factors and is judged on accuracy, sensitivity and reliability of the calibrated transducer, in addition to the input coils of verified matrix Converter affect one of n calibrated voltage maximum value, corresponding to the maximum change one of the physical parameters, and modulate it calibrated voltage at the same time the entire amount of m calibrated voltage maximum allowable values, and the cumulative impact on the calibrated transducer continuously up to the time of occurrence of a failure in the respective output of this Converter, and the length of time from the start of the operation until the time of the occurrence failure is considered a complete resource for test matrix Converter under extreme environmental conditions.

The proposed automated technology is implemented in the device shown in the drawing.

The circuit device includes a source 1 of the commutated current variable frequency for excitation of n inductors (sensors) test matrix eddy current probe 2, the processor node 3 monitor 4 and the electromagnetic int is has 5 for electromagnetic coupling with n coils of the matrix Converter 2. Structurally, the interface 5 is incorporated into the structure of verified Converter 2.

Test matrix eddy-current transducer 2 is an electromagnetic matrix consisting of n inductors, different in accordance with the task of separate and independent control of physical parameters on the electrical and geometrical parameters, shape, location and coordinate the orientation of the coil in the matrix that provides the coil matrix of different magnitude and direction areas of sensitivity. The number n of the inductance in the Converter 2 must be equal, as a rule, the number n of the measured physical parameters. The carrier frequency of excitation of the n inductors, electromagnetic matrix, which are the inputs of the Converter 2, is chosen not less than an order of magnitude more than the switching frequency. Switching provides sequential (serial) excitation of each coil, which causes the elimination of electromagnetic interference n inductors of the Converter 2 to each other. In the excitation inductance matrix switching current of variable frequency in the vicinity of each of the coils in turn creates an electromagnetic field at a time determined by the switching frequency.

The n inputs of processor node 3 is connected to n outputs, n is wireimage Converter 2. Software CPU node 3 is intended for the maintenance of reference data on n measured physical parameters of the reference sample and m environmental factors. The parameters n and factors of m are initiated in the form of calibrated voltages. Information for the calibrated voltages defined from the first to the last physical parameter and the factor, and the variation ranges of the calibrated voltages contained in the software. Ranges of voltages simulating n physical parameters are taken from the minimum to the maximum values, and the ranges of the voltages simulating m environmental factors, taken from normal to maximum permissible values. The ranges of the measured physical parameters and maximum allowable values of environmental factors necessarily be specified in the technical specifications to test the Converter 2. The output signals of verified Converter 2 are recorded on the video monitor 4.

Electromagnetic interface 5 is a coil of inductance and is designed for electromagnetic coupling with the coils of the transducer 2. When the calibrated excitation voltage interface 5 in its surroundings is created that the same electromagnetic field. This field interacts with the electromagnetic fields of the coils of the solenoid matrix calibrated Converter 2 changes the electrical parameters of the latter, which causes adequate change of the output electric signal Converter 2 due to changes in the values of the calibrated voltage.

Output signals from the calibrated transducer 2 are removed by the inputs of node 3, which programmatically generated according to the output electrical signals from changes in the values of physical parameters and factors and remembered. The received information is displayed on the monitor 4.

The method works as follows.

On coil inductance (sensors) model matrix eddy current probe serves switching current of variable frequency, which excites in series with the switching frequency, each of the inductors exemplary matrix Converter.

Why exemplary matrix Converter are placed on a multiparameter bench in front of the rolling multiparameter reference sample or set oneparametric samples of conductive material on a given gap and move the discrete sample in perpendicular directions relative to the exemplary transducer in a horizontal plane. D. the more change the gap between the Converter and the reference sample by a specified amount and the operation is repeated similarly to the above. Operation continuing on other clearances fixed rate. In all cases, the electrical output signals from outputs of an exemplary matrix Converter capture, remember and build verification characteristics depending on changes of physical parameters.

The next step of the method is that the exemplary matrix Converter is placed in a sealed climatic chamber and creates a consistently conditions, adequate change sequentially each of the factors of the external environment. However, the information record, remember and build output characteristics with the exemplary outputs of the matrix Converter from changes in each factor.

On the received reference experimental data create software for automated calibration, which enables automatic operation of forming the n variable calibrated electrical voltages proportional to the change in n physical parameters of the reference sample, and m changing the calibrated voltages proportional to the change in m environmental factors. After carrying out the above process operations need to use (application) of multiparameter bench and climatic chambers is lost and further Astia method of verification for the subsequent verification of the converters is automatically created by software.

In accordance with the automated software or by the will of the operator simultaneously to all n inputs calibrated Converter affect the individual by changing the value of the calibrated voltage, equivalent in magnitude and nature of changes in certain physical parameter of the reference sample, and build according to output electric signals from all outputs calibrated Converter from this particular physical parameter. Since each of the inductors of verified inverter in conformity with the purpose of the separate and independent control of physical parameters has different electrical and geometrical parameters, shape, location, and coordinate the orientation of the zone of sensitivity in the electromagnetic matrix calibrated Converter, this specific physical parameter will cause the greatest change in output electrical signal at the output of the coil (inverter), which is most sensitive to this physical parameter.

The procedure for calibration with another calibrated voltage, equivalent in size and character changes to another physical parameter, perform similarly. This is another physical parameter will cause the most is the changing of the output electrical signal of verified matrix Converter at the other output, i.e. will match the other measuring coil.

The operation verification is repeated sequentially for the other remaining n physical parameters, which in turn will cause the greatest change in the electrical parameters of coils in accordance with the objective of control is designed to control data of the physical parameters. Then the dependences of the output electric signals corresponding to the change of n physical parameters, analyze and define them metrological characteristics of verified matrix Converter in statics.

This technology perform similarly with each of the m factors of the environment, i.e. the effect of individual variable calibrated voltage simultaneously to all inputs calibrated Converter and also build individual according to output electric signals from the outputs of verified Converter from changes in factors. In this case, the change in dependency on changes of the temperature factor will be the largest since the electrical parameters of the coils change much stronger against the dominant factor than on other factors under consideration. The influence of other factors on the electrical parameters of the coil and less comparable, therefore, is a sufficient procedure carry out the ü on that factor, which causes the greatest change in output electrical signal with a calibrated transducer. On the obtained characteristics with outputs calibrated Converter depending on the changes of the factors causing a change in the electrical parameters of the coils of the solenoid matrix calibrated Converter, determine the degree of influence of certain factors on the calibrated Converter, and the value of the maximum allowable load factor detect resistance test the inverter to the environmental factor.

Then move to group procedure. For this purpose, the input coils of the matrix Converter is additionally affected by one of n calibrated voltage maximum value, corresponding to the maximum change one of the specific physical parameters, and modulate it calibrated voltage at the same time the entire amount of m calibrated voltage maximum permissible values. In this case, according to the law “principle of superposition” in the physics of electromagnetic fields resulting effect of multiple independent effects of factors represents the sum of effects of each impact factor separately (see encyclopedia). In other words overlap amplitudes calibrated electric voltage the deposits and the total level calibrated voltage increases, that simulates the effects of amount of factors. This is the cumulative impact on the Converter continuously up to the time of occurrence of a failure in the respective output transducer, and the length of time from the start of the operation up to the time of occurrence of the failure is considered a complete resource for test matrix Converter.

The technical result, which directed this solution is the simulation of changes in physical parameters of the field object and environmental factors electromagnetic calibrated voltage and the possibility of determining the full service life under extreme climatic and mechanical effects that, in General, when using the new technology will ensure the quality and reliability of controlled multiparameter objects especially responsible, especially tehnoobshow destination. When this new technology is cost-effective because it requires constant test bench equipment and special climatic chambers, initiating a change in the physical parameters of the field of object control, and environmental factors.

Literature

1. Vgusakov, Ahimsa. The method of predicting residual life of the products. / Control. Diagnosis. No. 9, 2003. P.30-31.

The method of determining the metrological performance and reliability matrix eddy current probe in dynamic conditions, in which the excitation inductors exemplary matrix Converter switching current of variable frequency, an exemplary matrix Converter first on multiparameter bench, then in a climatic chamber and in both cases, a separate removal from the outputs of the exemplary matrix Converter dependency changes the output electrical signals from each of the n physical parameters of the reference samples and each of m environmental factors, respectively, and the reference experimental data store and create them software automated subsequent research verified the matrix converters, allowing alternate electromagnetic effects simultaneously on all coils tested matrix Converter by changing the value of the calibrated electric voltages simulating the change of each physical parameter of the reference sample and each of the environmental factor, and the limits of change of the calibrated voltages selected the La changes of physical parameters from minimum to maximum values, and for factors from normal to maximum permissible values specified in the technical specifications to test the Converter, and upon the results of the automated checking build characteristics change all output electrical signals calibrated Converter depending on the changes individually calibrated voltages simulating n physical parameters and m environmental factors, analyze the dependence on the physical parameters and environmental factors and is judged on accuracy, sensitivity and reliability of the calibrated transducer, characterized in that, in addition to the inputs of matrix coils calibrated Converter affect one of n calibrated voltage maximum value, corresponding to the maximum value changes one of the physical parameters, and modulate it calibrated voltage at the same time the entire amount of m calibrated maximum allowable stress values, and the cumulative impact on the calibrated transducer continuously up to the time of occurrence of a failure in the respective output of this Converter, and the length of time from the start of the operation up to the time of occurrence of the failure is considered a complete resource for test matrix Converter in extreme conditions the x environment.



 

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