RU3008U1 - AUTOMATIC CONTROL SYSTEM FOR GAS-TURBINE ENGINE - Google Patents

Abstract

An automatic engine control system comprising a first control channel, which consists of a first control unit, a first comparison element and a first parameter controller connected in series, a second control channel, which consists of a second control device, a second comparison element and a second parameter controller connected in series, the output of each parameter controller connected to the corresponding input of the selector, while the output of the selector is connected to the actuator, the output of which is connected with the engine, and the engine is connected to the first and second meter of adjustable values, while the output of each meter of adjustable variable is connected to the second inputs of the first and second comparison element of the corresponding control channel, characterized in that the system further comprises a device for determining the zone of joint operation of the regulators, connected in series the third comparison element, the key, the integrating link, the summing element, and the first input of the device for determining the zone of joint work of the regulator c is connected to the output of the first parameter controller, and the second input to the output of the second parameter controller, with the output to the second key input, the first input of the third comparison element connected to the output of the first setter, and the second input to the output of the first meter of adjustable magnitude, the first the input of the summing element is connected to the output of the first master, and the second input to the output of the integrating link, while the output to the first input of the first comparison element.

Description

F 02 with 9/28

AUTOMATIC CONTROL SYSTEM FOR GAS-TURBINE ENGINE

The utility model relates to the field of automatic regulation of complex objects, for example, gas turbine engines (GTE), the cuts of which are set by regulating one of the n parameters and limiting the maximum permissible values for the given operating mode. The rest (n - I) parameters.

Known control systems designed to automatically control several parameters of a gas turbine engine with an effect on fuel consumption, comprising a speed control channel, which consists of a speed controller, a first comparison element and a speed controller, a gas temperature limiting channel, which consists of a gas temperature controller, second comparison element and gas temperature controller, minimum signal selector, actuator, engine and frequency meters rotation and gas temperature I, fig. 4.6; 2, fig. 3.26.

Better than the selector in the automatic control system (CAP) allows you to exclude the zone of joint operation of the control channels and provides in all operating conditions of the system the impact on the regulatory factor of only one regulator. However, under the influence of random noise and disturbances on the ATS with a selector, a zone of joint operation of control channels appears, which leads to a decrease in the static accuracy of the system.

The closest technical solution chosen for the closest analogue is the SAR GTD containing a frequency control channel

rotation, which consists of a series-connected speed controller, a first comparison element and a speed controller, a gas temperature limiting channel, which consists of a series-connected temperature controller, a second comparison element and a gas temperature controller, the output of each parameter controller is connected to the corresponding input of the minimum signal, while the output of the minimum signal selector is connected to the actuator, the output of which is connected to the engine, and d the wiggler is connected to an inertialess speed meter and a gas temperature inertialess meter, while the output of each adjustable well meter is connected to the second inputs of the first and second comparison elements of the corresponding control channel 2., Fig. 3.26.

As you know, selectors in the ATS GTD are introduced to eliminate the zone of joint work of the regulation channels. Selectors provide in all operating conditions of the system the impact on the regulatory factor of only one controller, included in the work depending on the operation mode of the gas turbine engine. In this case, each of the control channels operates autonomously and its parameters can be selected without regard to interaction with other controllers. Typically, the principle of selection is applied, according to which the engine parameter is adjusted, which is closest to the value determined by the regulator setting (regulation program). Such selection is implemented using algebraic selectors.

Let us consider the conditions for the existence of a mode of continuous channel switching in a stabilization system of a two-dimensional object with one control action and with an algebraic selector based on the method of structural transformations 3, since such a regime disrupts the normal operation of the ATS with the selector.

undamped oscillations in the difference of signals E at the inputs of the selector

where U1 is the selectable signal of the speed control channel;

U2 is a selectable signal of the gas temperature limiting channel.

It is known that the work of an algebraic selector is described by the expression

W, if kE 0;

and

TJ2 if kE O

where k +1 - in the case of a maximum selector;

i, 1 in the case of a minimum selector.

Therefore, with respect to the difference of the input signals, the algebraic selector of two quantities can be represented in the form of an equivalent nonlinear structure, including non-linearity of the module type. In this case, the analysis of the noise immunity of a two-channel ATS with a selector reduces to the study of an equivalent single-channel nonlinear system containing module-type nonlinearity.

Consider the case when the change in the regulatory factor is carried out by the speed control channel, and random interference affects the gas temperature limiting channel. Each of the regulation channels operates autonomously. Accordingly, if both adjustable parameters of the motor are close to the values determined by the settings of the regulators, then the influence of the squeezing control channel will lead to repeated changes in the sign of the difference in signal E depending on the level of random interference. This is characterized by the interaction of the regulators through the selector and the emergence of a collaboration zone.

Similarly, analysis can be carried out in the presence of interference in another control channel or in both channels simultaneously.

S U1 - U2, (1)

 U1 + U2 + k | E, (2)

Consider a nonlinear inertialess element equivalently replaced by two inertialess elements 4, Fig. 9.25: non-linear in mathematical expectation and linear in random centered component.

Note 4 that for even nonlinear characteristics with rectifying properties, the expectation of the signal at the output is nonzero even with zero expectation of a random signal at the input.

In this case, in the collaboration zone, when the control channels of both parameters work simultaneously, the selector turns into a normal adder 2. As a result, for the ATS of the gas turbine engine in the zone of joint operation of the regulators acting on one regulatory factor, in steady-state modes, a decrease in the values of the adjustable parameters with respect to the specified settings of the regulators is characteristic, which leads to a decrease in the static accuracy of the system.

The task to which the utility model is directed is to increase the static accuracy of regulation of the ATS GTE in the presence of interference.

The problem is achieved in that in the automatic control system of a gas turbine engine containing a first control channel, which consists of a first master, connected in series with the first comparison element and the first parameter regulator, a second control channel, which consists of connected in series with the second master, the second comparison element and the second parameter knob, the output of each parameter knob is connected to the corresponding input of the selector, while the output of the selector is sub specific to the actuator, the output of which is connected to the engine, and the engine is connected to the first and second non-response measuring instrument of adjustable values, while the output of each meter

adjustable variable connected to the second inputs of the first and second comparison element of the corresponding control channel, in contrast to the closest analogue introduced a device for determining the zone of joint operation of the regulators, connected in series with the third element of comparison, a key, an integrating link, a summing element, and the first input of the device for determining the zone of joint work controllers is connected to the output of the first parameter controller, and the second input to the output of the second parameter controller, while the output to the second input key, the first input of the third comparison element is connected to the output of the first master, and the second input is connected to the output of the first meter of adjustable magnitude, the first input of the summing element is connected to the output of the first master, and the second input is connected to the output of the integrating link, while the output of the summing element is connected to the first input of the first element of comparison.

The essence of the system is illustrated by drawings. In FIG. I is a block diagram of an ATS GTE; in FIG. 2 is a block diagram of a device for determining a zone of joint operation of regulators; FIG. 3 - graphs of changes in system parameters at steady state.

The system contains a first control channel, which consists of a first setter I, series-connected the first comparison element 2 and the first parameter 3 regulator, a second regulation channel, which consists of a series-connected second setter 4, the second comparison element 5 and the second parameter 6 controller, each output the parameter regulator is connected to the corresponding input of the selector 7, while the output of the selector 7 is connected to the actuator 8, the output of which is connected to the motor 9, and the motor 9 is connected ene 10 with the first and second controlled variables II meter, thus measuring the output of each controlled variable is connected to the second inputs of the first 2 and the second comparison element 5

the corresponding channel of regulation, the device for determining the zone of joint operation of the regulators 12, sequentially connected the third comparison element 13, the key 14, the integrating link 15, the summing element 16, and the first input of the device for determining the zone of joint work of the regulators 12 is connected to the output of the first regulator of parameter 3, and the second the input is to the output of the second controller of parameter 6, while the output is to the second input of the key 14, the first input of the third comparison element 13 is connected to the output of the first master I, and the second input to the output th meter 10 of the summing element 16 is connected to the output of the first set point I, and the second input - to the output integriruschego link 15, while the output - to the first input of the first comparison element 2.

The device for determining the zone of joint operation of the regulators 12 contains a fourth element of comparison 17, the first comparator 18, the differentiating link 19, the quadrator 20 and the second comparator 21, and the first input of the fourth element of the comparison 17 is the first input of the device for determining the zone of joint operation of the regulators 12, and the second the input is the second input of the device for determining the zone of joint work of the regulators 12, the output of the second comparator 21 is the output of the device for determining the zone of joint work of the ulyatorov 12, the second input of the first comparator 18 and a second input of the second comparator 21 of the zero level signal is supplied.

ATS GTD works as follows.

Consider an ATS with a minimum signal selector 7, when the control factor is controlled by the first control channel, and random interference affects the output of the second control channel.

The input of the first controller of parameter 3 from the output of the first element of comparison 2 receives the error signal E1 between the signal

a summing element 16 equal to the difference of the output signal from the first setter I and the signal of the first meter 10 of an adjustable magnitude. At the output of the first controller of parameter 3, a control signal U1 is generated, which is fed to the first input of the minimum signal selector 7. The signal and U1 from the output of the minimum signal selector 7 to the input of the actuator 8 changes its output signal, which is a control action (for example, fuel consumption in the main combustion chamber of the engine 9), to reduce the mismatch E1.

The output signal of the second meter II adjustable variable

where Y2 is the output signal without taking into account random interference;

F is random interference.

The output of the second controller of parameter 6 receives a signal

where F1 is the random noise reduced to the output of the second controller

parameter 6;

to the second input of the selector 7 of the minimum signal. Then, if the signals U1 and U2 are close to dfug and P is sufficiently large, then the influence of the signal U2p will lead to repeated changes in the sign of the difference in signal E depending on the level of random interference F. This situation is characterized by a violation of the channel switching condition and the appearance of the random switching mode channels (random fluctuations in E) in the zone of their joint operation, which is accompanied by a decrease in the statistical accuracy of the system as discussed above. Thus, according to 2, p. 105, in the zone of joint operation, the control channels of both parameters, astatic in the absence of switching, will become static under random signal disturbances, which will lead to the appearance of a static control error.

U2r U2 4- P, (3)

U2j, U2 + 14, (4)

in this situation, it is necessary to increase the accuracy of the system in steady-state modes by increasing the order of stand-by-step 5, Fig. 123, and the first control channel by including in the circuit of the first setter I additional elements: the third save element 13, the key 14, the integrating link 15 and the summing element 16.

From the output of the third comparison element 13, a mismatch signal is received between the signal of the first setpoint I and the signal of the first meter 10 of adjustable magnitude to the first input of the key 14. The control signal for the key 14 is generated by the device for determining the zone of joint operation of the regulators 12. Therefore, the inclusion of the integrating link 15 occurs only in the joint zone of both parameter controllers. The inputs of the summing element 16 receive the integrated component of the error signal from the integrating link 15 and the signal from the first master I. That is, the inclusion of the integrating link 15 increases the magnitude of the set action and thereby increases the value of the adjustable parameter, which increases the static accuracy.

The device for determining the zone of joint operation of the regenerators 12 operates as follows.

On the fourth comparison element 17, the signal difference is determined

Ep W - U2p,

which goes to the first input of the first comparator 18 and is compared with a zero level at its second input. When E ,,, O, the first comparator 18 will have a signal at the output equal to the zero logic level, and at Ep about equal to a single logical level. In the mode of random oscillations in Ej, the output signal of the first comparator 18 will continuously change the signal from O to I, and vice versa. Further, this signal is fed to the input of the differentiating link 19, forming a sequence of pulses of random oscillations along E. So when you change the output signal of the first comparator 18 from O to I

a positive impulse is obtained, and when changing from I to O, it is negative. Therefore, the pulse train of the differentiating link 19 is rectified using a quadrator 20. The control signal for the key 14 is supplied from the second comparator 21, to the first input of which a signal from the square 20 is supplied, and the second input is connected to the zero level.

Similarly, an analysis of the operation of the ATS under the influence of interference on the first control channel or on both channels simultaneously can be carried out.

ATS with the maximum signal selector 7 works similarly.

So, the claimed utility model can significantly increase the static accuracy of regulation of the ATS of the gas turbine engine under the influence of random noise on the regulation channels (Fig. 3).

Information sources:

1. Bodner V.A., Ryazanov Yu.A., Shaimardanov F.A. Automatic control systems for aircraft engines. M., Mechanical Engineering, 1973, - 248 p.

2. Integral systems for automatic control of aircraft power plants / Ed. Doct. tech. sciences prof. A.A.Shevyakova. M .: Engineering, 1983, - 283 p.

3.Petunin V.I. About a method of structural transformations of control systems with an ideal algebraic selector / Management of complex technical systems. Interuniversity scientific collection N 2. Ufa, UAI, 1978, - 172 p.

and special automatic control systems / Ed. A.A. Voronova. M .: Higher school, 1977, - 288 p.

5. Collection of tasks on the theory of automatic regulation and control / Ed. V.A. Besekersky. M .: Nauka, 1978, 512 p. Vice-rector for scientific work

(//// UMgM - V.S.Zhernakov

Claims (1)

An automatic engine control system comprising a first control channel, which consists of a first control unit, a first comparison element and a first parameter controller connected in series, a second control channel, which consists of a second control device, a second comparison element and a second parameter controller connected in series, the output of each parameter controller connected to the corresponding input of the selector, while the output of the selector is connected to the actuator, the output of which is connected with the engine, and the engine is connected to the first and second meter of adjustable values, while the output of each meter of adjustable variable is connected to the second inputs of the first and second comparison element of the corresponding control channel, characterized in that the system further comprises a device for determining the zone of joint operation of the regulators, connected in series the third comparison element, the key, the integrating link, the summing element, and the first input of the device for determining the zone of joint work of the regulator c is connected to the output of the first parameter controller, and the second input to the output of the second parameter controller, with the output to the second input of the key, the first input of the third comparison element connected to the output of the first setter, and the second input to the output of the first meter of adjustable magnitude, the first the input of the summing element is connected to the output of the first master, and the second input to the output of the integrating link, while the output to the first input of the first comparison element.