Method of identifying effect of technological changes over time of input control values on dynamic control channel characteristics of object with variable structure

IPC classes for russian patent Method of identifying effect of technological changes over time of input control values on dynamic control channel characteristics of object with variable structure (RU 2450302):

G05B13/04 - involving the use of models or simulators

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FIELD: physics.

SUBSTANCE: at the beginning of each test during a certain period of time, the signal at the output of the object is picked up without transmission of any organised action to its inputs; a technological control program and a stepwise signal are then transmitted to the object through a control channel, while further picking up the signal at the output of the object until the end of transient processes, wherein the control action is varies either simultaneously with the beginning of transmission of the technological control program to the object or after, wherein in all repetitions of tests of each of the experiments, that lag is set to be equal; after completion of each experiment, transient response curves obtained during the tests are averaged; the averaged transient response curve of the first experiment is superimposed at the instant the control action changes with the averaged transient response curve of the second experiment and the first averaged transient response curve is subtracted from the second to obtain the final transient response curve; the obtained final transient response curve is smoothed with selection of the old and new established levels and dynamic characteristics of the effect of the technological control program on the output value of the object is estimated on the investigated control channel.

EFFECT: identifying the effect of technological changes over time of input control values on dynamic control channel characteristics of an object with a variable structure.

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The invention relates to automatic control and regulation, and can be used for the experimental description of the object's properties and build models describing the behavior of an object with variable structure under technological change in time of the input value management (technology management program) for cyclic and continuous interest in existing management systems.

The complex of methods of identification of objects in control systems using pseudorandom (PS) signals formed on the basis of sequences of maximum length (see theory and application of pseudorandom signals / A.I. Alekseev, Sheremetiev A.G., Aces GI, Glazov B. I. // - "Science", 1969). Under a pseudo-random sequence means a sequence of p-ary digits generated by a shift register with appropriate feedback. Pseudo-random (noise-like) they are called for the reason that despite the regular structure have almost all the signs of realization of the random sequences. In addition, the autocorrelation function of the PS signal formed in accordance with a binary sequence (p=2), resembles the autocorrelation function of white noise, i.e. δ-function. In systems for measuring motion parameters of PS-a signals ensuring the Ute maximum measurement accuracy of range and speed, as their chart of uncertainty is almost optimal. As you know, the δ-functions are used to identify objects in the control systems.

Identification of objects in existing management systems carry out a lump sum in the period setting of the support systems of the decisions of the human operator, either periodically for Supervisory adaptation settings used models of objects. Thus, in the second case, the periods of the control objects in normal mode alternate with periods of active identification of these objects. During the identification of the objects managed in the mode of an input to hidden or open PS-signals.

Disadvantage: under the action applied to the object active test effects can significantly change the properties of this object. Its influence program changes test (trial) impact on the results of identification of the properties of the object, the method does not take into account. The results of identification for the same object can be significantly different.

The closest in technical essence to the present invention is a method for identifying objects in existing systems, including the fixing of the trajectories of change of input and output variables in time and the assessment of the dynamic nature of the istics of the investigated channel regulation by difference of the trajectories of change over time in the predicted and actually received by the time-dependent output values of the object, the difference trajectory changes over time predicted and actually implemented the time-dependent controls, according to the forecast errors and regulation, pre-identified channel perturbations, and evaluation of the ratio control channel is found by the formula (SU # 2325683 G058 13/04 was investigated, 2008).

The disadvantage of this method is that it is not possible to identify the impact of technological change in time of the input control values on the dynamic characteristics of the control channel object with variable structure.

The objective of the invention is to identify the impact of technological change in time of the input control values on the dynamic characteristics of the control channel object with variable structure that improves the quality of the experimental study of the object.

This is achieved in that in the method of identifying the impact of technological change in time of the input control values on the dynamic characteristics of the control channel object with variable structure, including the first experiment - a series of parallel experiments - cycles operation object according to the curves of the acceleration of the object (the time variation of the output values of the object under the effect of a step change of the input variable) channel d is lirovaniya without a supply of technological change in time of the input control values and the second experiment a series of parallel experiments cycles of operation with the supply of technological change in time of the input control values during each of the first experience for a certain period of time, record the signal at the output of the object without submitting to its inputs any organized influences, then the object serves intermittent signal on channel regulation and technological change in time of the input control values, capturing the signal at the output of the object until the end of the transient, and regulating the impact of changing either simultaneously with the beginning of the submission process control program for the object, or later, with all the repetitions of the experiments each experiment is lag set the same, after the completion of each experiment acceleration curves obtained in the experiments, average, average curve acceleration of the first experiment combined torque changes in the regulatory impact with the average curve of the acceleration of the second experiment and subtract the first averaged curve acceleration of the second with obtaining final curve acceleration, reflecting the impact of in-time process control program to output value of the object on a particular control channel, the resulting curve acceleration smooth with the selection on it's old and novog the steady-state levels and evaluate the dynamic characteristics of the impact of technological control program on a particular channel regulation on the output value of the object, when this conditional transfer coefficient for the channel, "the Impact of technological change in time of the input values of the control for changing the output values of the object are determined by the expression:

- the old value of the steady-state level on the final smoothed curve acceleration output values of the object - to moments of submission, as regulatory impact on a particular channel regulation, and technological programs management;

Δt≥0 is the delay time changes in regulatory impact relative to the beginning of the submission process control program;

- the value of the new steady-state level on the final smoothed curve acceleration output value of the object after the filing of the regulatory impact on a particular channel management and technology management program.

Figure 1 shows the resulting curve of acceleration according to the experiments conducted on the research object.

Figure 1 is displayed: 1 - technological change in time of the input control values; 2 - intermittent signal on the control channel, that is, the trajectory of change in time of the input variable object research; 3 - average curve acceleration of the first experiment curve changes in BP is when the output value of the object under the action of abrupt change in the input variable of the object on the control channel without filing process control program; 4 - average curve acceleration of the second experiment curve changes over time of the output values of the object under the action of abrupt change in the input variable of the object on the control channel with the process control program; 5 - final smoothed curve acceleration of the object; U_CR- option variable process control program in time; U_p- regulatory effect on a particular control channel; Δt is the delay time changes in regulatory impact relative to the beginning of the submission process control program;- the old value of the steady-state level on the final smoothed curve acceleration output values of the object - to moments of submission, as regulatory impact on a particular channel regulation, and technological programs management;- the value of the new steady-state level on the final smoothed curve acceleration output value of the object after the filing of the regulatory impact on a particular channel management and technology management program.

After conducting experiments on the examined object and obtain the final smoothed curve acceleration of the object 5 (1) by the formula (1) are not normal dynamic characteristics and living conditions of the inmates, because of these characteristics will depend on what will Δt is the delay time changes in regulatory impact relative to the beginning of the submission process control program. As the impact of technological change in time of the input values of the control properties of the object change!

As the object is the object with variable structure. Technological change in time of the input control values change the structure of the object itself. A typical example of such an object is the ladle with molten steel and slag in the process furnace steel processing - when the melt blowing a neutral gas through immersion lined the tuyere. Technological change in time of the input control values represent the change in position of the lance in the ladle during the purge. This provision is changed according to a certain program that accelerates the process of homogenization of the molten steel temperature and chemical composition. When moving the lance is the breakdown of laminarinase convective flow of the melt under the action of rising gas streams emanating from the working end of the lance.

Technological change in time of the input control values can be quite different. Most often implemented in the automatic mode. This can realitv is to be one or the other pre-selected automatic program.

As regulatory impact in the considered example is, for example, the intensity of the purge - air flow rate of the inert gas. As the output value of the object can be seen, for example, the maximum variation of melt temperature throughout the volume of the bucket, i.e. the difference between the temperature of most hot and less hot local areas of the melt in the ladle.

Each structural location of the tuyere in the bucket has its own pattern of convective flow is a function of the current fluid curves and changes of speed of movement of the molten steel. In addition, when other conditions are equal to each such position of the tuyere corresponds to its temperature distribution and chemical composition of individual volumes of melt bucket. If you change the position of the tuyeres, for example to raise it in the "bucket-lance-melt" will begin the transition process. If the position of the tuyere is changed according to the program, in the "bucket-lance-melt" constructively be specific sequence in time of different objects. Transients from essentially different objects will overlap. Moreover, the result cannot be obtained by a simple summation, because there is the effect of the growing influence of technology programs. Moreover, the effect of the gain does not remain constant. The thing is that what changes is the new sequence (exchangeable) objects! Herself curve acceleration is a complex curve (as the sum of several vzaimoobuslovlennykh curves). The impact of each new state of the object generated by changes of its structure, as a rule, until the end realized in no time. The system does not have time to come to a new steady state, the coming of the new technological programs. Curves can accelerate from essentially different objects will overlap. In the above example, it is beneficial to the properties of the object itself, since it makes the output of convective flow of melt from the laminar state. It is possible to measure only the integral, generalized result. For these reasons, obtaining descriptions in General is difficult.

Since the measured dynamic characteristics of the object are conditional, they are meaningful only for this technology programs. Losing the generality of the obtained dynamic descriptions of the object. To study the dynamic characteristics of the object with variable structure is possible only for a specific technology programs. Therefore, as the necessary conditions of the experiment it is necessary to capture technological change in time of the input Majesty the n control.

The method is implemented as follows.

1. In the first experiment several times off the curve of the acceleration of the object on the control channel without technology management program. The obtained curves average.

2. In the second experiment, several times removed curve acceleration of the object on the control channel with the technological program, and the input signal on the control channel change abruptly at the same time or after the filing of the object technology management program. The obtained curves average.

3. First the averaged curve is subtracted from the second, thus find the averaged curve of the acceleration of the impact of technological programs on the transient response on a particular control channel. The resulting curve acceleration smooth.

4. On the final smoothed curve acceleration distinguish oldand the newsteady-state levels.find as the value of the steady-state level on the final smoothed curve acceleration output values of the object, which took place before moments of submission, as regulatory impact on a particular channel management and technology management program.find as the value of the steady-state level on the final smoothed curve acceleration is echodnou value of the object, which took place after the filing of the regulatory impact on a particular channel management and technology management program.

5. Evaluate the dynamic properties of the impact of technological programs on a particular channel regulation on output variables of the object. So the conditional transfer coefficient for the channel, "the Impact of technological control program to change the output values of the object are determined by the expression (1).

The number of repetitions of experiments n in the experiment should be such as to further allow to reliably detect effects on the object regulatory impact and process control program: n≥5. While a lower value indicates less noise variance. Than the experimental scatter shot curves of acceleration within a given experiment will be higher the greater the number of required experiments.

The advantage of this method is its relative simplicity. It can be used for objects with variable structure of different nature, which are used for process control program: metallurgical units, mixers with intelligent control, pseudocistela, ventilation systems with variable position vanes and other

The method of identifying the impact of technological change in time of the input values of the control dynamically the characteristics of the channel control object with variable structure, including the first experiment - a series of parallel experiments - cycles operation object according to the curves of the acceleration of the object (the time variation of the output values of the object under the effect of a step change of the input variable) channel regulation without filing process control program and the second experiment is a series of parallel experiments - cycles of an object with a process control program, wherein during each of the first experience for a certain period of time, record the signal at the output of the object without submitting to its inputs any organized influences, then the object serves intermittent signal on the control channel and technology program management, locking next, the signal at the output of the object until the end of the transient, and regulating the impact of changing either simultaneously with the beginning of the submission process control program for the object, or later, with all the repetitions of the experiments each experiment and this delay : set the same, after the completion of each experiment acceleration curves obtained in the experiments average, the averaged curve of acceleration of the first experiment combined torque changes in the regulatory impact with the average curve of the acceleration of the second experiment and Wichita the t first the averaged curve of the acceleration of the second with obtaining final curve acceleration, reflecting the impact of in-time process control program to output value of the object on a particular control channel, the resulting curve acceleration smooth emitting at her old and new steady-state levels and evaluate the dynamic characteristics of the impact of technological control program on a particular channel regulation on the output value of the object, while the conditional transfer coefficient for the channel, "the Impact of technological control program to change the output values of the object are determined by the expression
,
where- the old value of the steady-state level on the final smoothed curve acceleration output values of the object - to moments serve as a regulatory impact on a particular channel regulation, and technological programs management;
Δt≥0 is the delay time changes in regulatory impact relative to the beginning of the submission process control program;
- the value of the new steady-state level on the final smoothed curve acceleration output value of the object after the filing as regulatory impact on a particular channel management and technology program management.