SU1645871A1 - Device for monitoring operation of gas-turbine engine - Google Patents

Abstract

Device for monitoring gas turbine engine operating modes The invention relates to a technique for testing gas turbine engines, in particular, to devices for indicating the rotational speed of a gas turbine engine rotor used to automatically start a gas turbine engine during a flight with a surge or an accidental reduction in speed below a predetermined value. The signals from the 3Q engine rotor speed sensor through the driver 2, differentiating link 3 and trigger 4 are sent to counter 5, in which the engine rotor code is generated. When the engine rotor speed reaches the value specified in the decoder 6, a logical signal is output, which is fixed in block 7 ti. The counter 5 is filled with the frequency from the output of the element OR 18, at which a stable frequency signal defined by quartz oscillators 1 or 12 is generated. Protection against frequency drift or failure of quartz oscillators 1 or 12 is provided. Such an embodiment of the device makes it possible to increase its reliability. 2 or 3 cl

Description

The invention relates to a technique for testing gas turbine engines, in particular, to devices for indicating the rotational speed of a rotor of a gas turbine engine, used to automatically start the gas turbine engine during flight when surging or accidentally reducing the rotor speed of the engine below a predetermined value iq _with

Nel invention - improving the reliability of the device with

On Fig, 1 presents a structural diagram of the proposed device; 15 on fig _about 2 is a sequence diagram of the operation of the controlled shaper.

The device for monitoring the operating modes of a gas turbine engine contains a first quartz oscillator 1, sequentially connected shaper 2, differentiating link 3, first trigger 4, first counter 5, decoder 6 and memory unit 7, signaling device 8, second trigger 9, control 2 shaper 10, first transducer 11, second quartz oscillator 12, second and third counters 13 and 14, third trigger 15, serially connected fourth trigger serr 16, first element 17 and first element OR 18, fifth trigger 19, serially connectednet trigger 20, the second element And 21 and the third element And 22, the output of which is connected to the second input of the first element OR 18, the output of which is connected to the second input of the first counter 5, the second output of the shaper 2 is connected to the input of the signaling device 8, the output of which connected to the first input of the second trigger 9, the second input of the memory unit 7 and the third input of the first counter 5, the second output of the first trigger 4 is connected to the second input of the second trigger 9, the third input of which is connected to the output of the first element OR 18, and the output to the third input block Ί memory and the input of the control shaper 10, the output of which is connected to the fourth input of the first counter 5 and the second input of the first trigger 4.

In addition, the device contains a series-connected fourth element AND 23 and a second element OR 24, series-connected a second converter 25, a fifth element AND 26 and a third element OR 27, the first and second controlled Shapers and 29, the output of the first crystal oscillator 1 is connected to the second inputs the fifth element And 26 and the second element IL '24 and the input of the first Converter 11, the output of which is connected to the first input of the fourth element And 23, the output of the second crystal oscillator 12 is connected to the input of the second Converter 25 and the second inputs of the fourth element And 23 and the third element OR 27, the output of the latter is connected to the second input of the second element And 21 and the first inputs of the third counter 14 and the fifth trigger 19, the second input of the last is connected to the first output of the second controlled shaper 29, and the output to the input the second controlled Shaper 29 and the second input of the third counter 14, the output of which is connected to the first input of the sixth trigger 20, the second input of which is connected to the second output of the second managed Shaper 29, the output of the second element OR 24 under is connected to the second input of the first element And 17 and the first inputs of the second counter 13 and the third trigger 15, the output of the latter is connected to the second input of the second counter 13 and the input of the first controlled Shaper 28, the first output of which is connected to the second input of the third trigger 15, and the second to the first the input of the fourth trigger 16, the second input of which is connected to the output of the second counter 13, and the second output to the second input of the third element And 22

In FIG. 2 also shows the engine speed sensor 30 rpm

The device operates as follows _and

The signal from the sensor 30 revolutions in the form of an alternating voltage, the repetition period of which is proportional to the number of revolutions of the engine rotor, is converted into rectangular pulses by the shaper 2. From the shaper 2, the rectangular pulses are fed to the differentiating link 3 and the signaling device 8. In the presence of pulses, the signaling device 8 enables the operation of trigger 9, block 7 of the memory and the end trigger of the counter 5. The signaling device 8 is designed to control the operability of the circuit sensor 30 - the output of the Shaper 2. If the specified control is interrupted5 ru my circuit or failure of the driver 2 at the output of the signaling device 8, the signal disappears, which entails the prohibition of the functioning of the trigger 9, the memory unit 7 and the terminal trigger of the counter 5, as a result of which they are set to the initial state and held in it until the enable signal from the output of the signaling device 8 Counter 5 is set to an overflow state, as a result of which, in the first measurement cycle, it goes from state O to state Q. This indicates that the engine speed has become lower than the corresponding given ur a ram.

The second pulse from the output of the OR element 18 after the counter 5 stops functioning triggers the trigger 9 from state O to state 0, with jq, the control driver 10 generates a pulse, which sets the code in counter 5 to the number?. (the number is equal to the number excluding false signals.

With the arrival of the next pulse from the differentiating link 3, which characterizes the end of the previous (measured period and the beginning of the next period), trigger 4 is set to a state in which from its first output to the first (control) input of counter 5 a signal is received that prohibits its functioning under the influence of pulses, coming from the output of the OR element 18 "The code recorded in the counter 5 and resulting from the measurement of the previous period is sent to the decoder 6" If the code corresponds to the code of the specified level of revolution If it is less than or equal to, then, from the output of decoder 6, a signal is received, for example, in the form of поступ, and, if the code is greater than a code of a given speed level, a signal in the form of "0. From the second output of trigger 4, a signal is transmitted to the second (control ) trigger input 9, allowing its operation under the action of pulses from the output of the element OR 18 "

Trigger 9 with the first pulse arriving at its third (counting) input switches from state Q to state O, and the signal, for example, in the form of 1, enters the third input of memory unit 7.

If there are signals in the form 1 * at the corresponding outputs of the decoder 6, which indicates the achievement of certain levels of revolutions, the corresponding storage cells of the memory unit 7 go from state Q to state O, which indicates the achievement of the specified levels of revolutions "If from one of the outputs of the decoder 6 a signal arrives in the form of 0, and a signal in the form of 1 arrives from the second trigger 9, then the corresponding cell of the memory unit 7 is converted to pulses arriving at the trigger15 ger 9). ”The same pulse transfers trigger 4 to the state at which rum with its output fed to a counter enable signal 5, and the trigger 9 - prohibiting their functioning. 20 The inhibitory signal from trigger 4 to the control input of trigger 9 excludes its transition to state O from state O under the influence of pulses from the output of the OR element 18.

The first counter 5 begins to accumulate pulses until the next next pulse arrives from the differentiating link 3, which characterizes the 3Q end of the previous period of the input signal and the beginning of the next period

Under the action of the next pulse from the differentiating element 3, trigger 4 changes its state to the opposite, and the device’s cycle is repeated. ”The pulse frequency coming from the output of the first element OR 18 to trigger 9 and counter 5 corresponds to the nominal frequency of crystal oscillators 1 and 12 even at failure or transition of one of them to the generation of pulses of the other

L Harmonics (frequency coast).

The monitoring of stall or coast-frequency of crystal oscillators is carried out as follows "

With operational quartz oscillators 1 and 12, each of them operates 50 for its own load, i.e. to the outputs of the element And 17 and the element And 21, respectively. ”In the normal state, the pulses of the quartz generator 1 are fed to the Converter 11, converting the pulses in. constant voltage of a logical level, as a result of which there is a signal at its output that enters the And 23 element and prohibits passage through it

164 to the OR element 24 pulses of the crystal oscillator 12, The pulses of the crystal oscillator 1 through the element I. PI 24 and the element And 17, at the second input of which there is an enable signal from the first (O) output of the trigger 16, are fed to the input of the OR element 18. From the second (O) of the trigger output 16, a inhibitory signal is received at the AND element 22, which prevents the passage of pulses from the output of the And 21 element to the first OR element 18. From the output of the OR element 24, pulses also go to the input of the counter 13 and trigger 15. From the first incoming pulse trigger 15 fires, t e. goes into another stable state and becomes self-locking, it does not respond to pulses arriving at its input. After changing the state of trigger 15, a signal appears at its output, for example, in the form of 1, allowing the functioning of the counter 13 under the influence of pulses from the output of the element OR 24 and the triggered guided driver 28.

After the signal from the trigger 15, enabling funK1 (ionization 'of counter 13, the last one accumulates impulses arriving at its input from the OR element 24. With the time interval (FIG. 2) from the moment the signal arrives at level “1 from the output of the third trigger 15 from the second the output of the first controlled driver 28 to the counting input of the trigger 16 receives a pulse, for example, with level 1. If before the pulse from the second output of the controlled driver 28 (Fig. 2), the counter 13 did not overflow and did not become self-locking, and therefore, with its output the signal does not arrive at the control input of the trigger 16, then under the influence of a pulse it will not change its state and the pulses of the crystal oscillator 1 will go to their load - to the input of the OR element 18. With a time interval from the moment the pulse ends at the second output of the controlled shaper 28 to it the first output there is a pulse, for example, in the form of O (Fig. 2), which sets the third trigger 15 to its initial state. At the same time, a signal with a level O appears at its output, which sets the counter 13 to its initial state, i.e., c> n resets Xia and becomes insensitive to arriving at its count input pulses.

The first pulse, at the input of trigger 15, after setting it to its initial state, transfers it to another stable state, in which a signal is received at the input of counter 13, which allows it to operate under the action of pulses from the OR 24 element and starts the controlled Shaper 28. the frequency coasting of the crystal oscillator 1 is repeated.

If at the moment t ₄ (FIG. 2) the frequency of the crystal oscillator 1 has run out (the frequency of the crystal oscillator 1 has increased), then the second counter 13 will overflow during the interval, which then becomes self-locking. When the next pulse arrives at the counting input of trigger 16 from the second output of the controlled Shaper 28, trigger 16 will switch from state O to state O. Then, at the second (O) output of trigger 16, the signal disappears (Fig. 2) and prevents quartz pulses from passing through element And 17 generator 1, and at the first (O) output, a signal appears allowing the passage through the And 22 element of the pulses of the second quartz generator 12 coming from the And 21 element and further through the OR element 18 to the counter 5 and trigger 9.

As a result of monitoring the frequency stick-out of the crystal oscillator 1 at the output of the OR element 18, the nominal frequency is maintained due to the normal functioning of the crystal oscillator 12.

If a frequency interruption occurs on the crystal oscillator 1 (failure of the crystal oscillator 1), the inhibitory signal disappears at the output of the converter 11 and the pulses of the crystal oscillator 12 pass through the AND 23 element and then pass through the OR element 24 to the inputs of the counter 13, trigger 15 and the element And 17. Similarly, the path of the crystal oscillator 12.

The converter 25 included in its composition, the And element 26, the OR element 27, trigger 19, the counter 14, the controlled former 29, the trigger 20 and the And 21 element operate in the same way 9

About the converter 11, element AND 23, element OR 24, counter 13, triggers 15 and 16, controlled by former 27 and element AND 17 „$

When any of the triggers 16 or 20 transitions (when the frequency of the corresponding quartz oscillator 1 or 12 drops) from state Q to state О from one of the outputs of triggers 16 or 20 (not shown), and also when the signal is removed from the output of any converter 11 or 25 ( when frequency breakdowns of the corresponding crystal oscillator 1 or 12) from their outputs (not shown in the drawing 15), a signal is issued to the signaling device to reduce the reliability of the operation of the paths of crystal oscillators 1 and 12.

Thus, the proposed device, by providing independent cascade control of stall and frequency run-out of crystal oscillators, can improve the reliability of the device, increase the reliability of 25 control commands, and prevent the device from issuing false commands that do not correspond to the actual operating mode of the gas turbine engine <,

Claims (1)

Claim A gas turbine engine operating mode monitoring device comprising a first quartz generator, a shaper, a differentiating link, a first trigger, a first counter, a decoder and a memory unit, a signaling device, a second trigger, a control shaper, a first converter, a second quartz generator, a second and third counters, the third trigger, the fourth trigger connected in series, the first AND element and the first OR element, 'the fifth trigger, the sixth trigger connected in series, the second element and the third AND element, the output of which is connected to the second input of the first OR element, whose output is connected to the second input of the first counter, the second output of the driver is connected to the input of the signaling device, the output of which is connected to the first input of the second trigger, the second input of the memory unit and the third input of the first counter, the second output of the first trigger is connected to the second input of the second trigger, the third input of which is connected to the output of the first OR element, and the output to the third input of the memory block and the input of the control Former, the output to which is connected to the fourth input of the first counter and the second input of the first trigger, characterized in that, in order to increase reliability, it further comprises series-connected fourth element AND and second OR element, series-connected second converter, fifth element AND and third OR element, first and the second controlled converters, the output of the first crystal oscillator is connected to the second inputs of the fifth AND element and the second OR element and the input of the first converter, the output of which is connected to the first mu input of the fourth element And, the output of the second crystal oscillator is connected to the input of the second converter and the second inputs of the fourth element And and the third element OR, the output of the latter is connected to the second input of the second element And the first inputs of the third counter and fifth trigger, the second input of the last connected to the first the output of the second controlled shaper, and the output to the input of the second controlled Shaper and the second input of the third counter, the output of which is connected to the first input of the sixth trigger, the second input of which connected to the second output of the second controlled driver, the output of the second element OR connected to the second input of the first AND element and the first inputs of the second counter and the third trigger, the output of the last connected to the second input of the second counter and the input of the first controlled driver, the first output of which is connected to the second input of the third trigger, and the second to the first input of the fourth trigger, the second input of which is connected to the output of the second counter, and the second output to the second input of the third element I.