SU1574837A2 - Device for checking maximal deflection of rotor from turbomachine axis - Google Patents

Abstract

The invention relates to a power system and improves the invention in accordance with the author N 1232833. The invention improves the control accuracy by determining the amplitude of the phase and frequency of the circulating component of the rotor deviation in the radial plane. For this, it is provided with a formers 17 and 18 of the cosine and sine reference signals, a second multiplier 19, connected via a first low-pass filter 20 to a third multiplier 21, a fourth multiplier 23, connected through a second low-pass filter 24 to a fifth multiplier 25, second adder 22, with an amplitude meter 26, a phase meter 27, and a rotational frequency meter 28. The output of the second adder 22 is connected to the outputs of the third and fifth multipliers 21 and 25 signals, the output of the frequency multiplier 14 is connected to the input of the meter 28 of the rotation frequency of the rotor 3, with the first inputs of the formers 17 and 18 of the cosine and sinus reference signals and the pulse input of the phase 27 . Other inputs of the formers 17 and 18 of the cosine and sine reference signals are connected to the output of the sensor 13 tags

in turn, the output of the sinus reference signal generator 18 is connected to the first inputs of the second, third and fourth signal multipliers 19, 21 and 23 and to the reference input of the phase meter 27, the output of the cosine reference signal shaper 17 is connected to one of the inputs of the fifth multiplier 25, the output of the first primary converter 1 is connected to the input of the second multiplier 19, and the output of the second primary converter 2 is connected to the input of the fourth multiplier 23. 1 Il.

Description

The iCBOHM input with the output of the extraction unit 7 is root, the sensor 13 of the mark is mounted near the rotor 3 and its output is additionally connected to the formers 17 and 18 of the cosine and sine reference signals, and the other inputs of these drivers are connected to the output of the frequency multiplier 14. The output of the first primary converter 1 through the second multiplier 19 connected in series, the first low frequency filter 20 and the third multiplier 21 are connected to one of the inputs of the second adder 22, the output of the second primary converter 2 through the fourth multiplier 23 connected in series, the second low frequency filter 24 and the fifth the multiplier 23, the second low-pass filter 24 and the fifth multiplier 25 are connected to another input of the second adder 22, the output of which is connected to the amplitude gauge 26 and the signal input of the phase meter 27. The output of the driver 18 sine reference signal is connected to other inputs of the second, third and fourth multipliers 19, 21 and 23 and with the reference input of the meter 27 phase. The output of the driver 17 of the cosine reference signal is connected to another input of the fifth multiplier 25, and the output of the frequency multiplier 14 is connected to the pulse input of the phase meter 27 and to the frequency meter 28.

The device works as follows.

From the transducers 1 and 2, the signals containing the instantaneous values of the components of the rotor 3 vibrations (without constant components) are sent to the corresponding quadrants 4 and 5 l of the multipliers 19 and 23. The squares of the values of these signals are transmitted from the quadrants 4 and b to the first adder 6 From the adder 6, the output signal is fed to the root extraction unit 7, and the output signal of the latter, containing the modules of the instantaneous values of the vibration of the rotor 3, is fed to the peak detector 8, which with its pulse from the pulse output captures the maximum value and vibration and executes the function generator 15.

The magnitude of the maximum vibration module Smai in the plane of placement of the primary converters 1 and 2 is displayed by the recorder 9, outputted to an external measurement device and simultaneously compared in the threshold unit 10 with the setpoint signal of the normalizing unit 11. The warning lamp 12 is triggered when the vibration value of the specified level is exceeded. marks pulses with the rotor 3 rotation frequency are fed to the pulse frequency multiplier 14 and the forcing signals 17 and 18 of the cosine and sine frequency reference signals from the rotor rotation 3. With you ode multiplier 14 frequency higher frequency pulse sequence is supplied to the inverter 15 fukntsionalny

and to other inputs of the formers 17 and 18 to the pulse inputs of the meter 27 fl -, s and the meter 28 frequency. In the functional converter 15 this

a sequence of pulses controls the output on its output of discrete values of the cosine-function function, expressed as the magnitude of the voltages. This signal from the output of the functional converter 15

Q is fed to one of the inputs of the multiplier 16, to the other its input receives a signal from the module of instantaneous values of the vibration vector of the rotor 3 from the root extraction unit 7. Multiplying these signals in multiplier 16 allows you to get a signal at its output

maximum vibration of the rotor 3 and the radial plane. Permission to issue discrete values of the cosine function, the number of which is equal to the number N of pulses during the period of rotation of the rtoro 3 at the output

0 a frequency multiplier 14, the functional transducer 15 is output once per rotation period of the rotor by a pulse of a pico detector 8 at the time of reaching the peak value by maximum vibration. At this moment, the functional transform 5 gel 15 produces a cosine value equal to m -1. One of the outputs of the device is the output of the multiplier 16 in the form of an alternating signal of the rotor speed with a maximum amplitude of vibration in the placement plane of the transducers 1 and 2.

In the imager 17 and 18 of the cosine and sine reference signals, the pulse sequence with the execution of the frequency multiplier 14 is converted in each rotation period of the rotor 3 into signals of the form i / i - aocos ut and t / 2 aos / ncot, gad an - amplitude, t - time

The signal Lf2 aosinti t from the output of shaper 18 of the sine reference signal is fed to the inputs of multipliers 19 and 23, to the other inputs of which signals of transmitters 1, 2 are fed.

After multiplying these signals in multiplier 19 and 23 and filtering the received signals with low-frequency filters 20 and 24, they are fed to the inputs of multipliers 21 and 25, respectively, to the second

The input of the third multiplier 21 is supplied with a signal from the driver 18 of the sine reference signal, and a second signal from the fifth multiplier 25 is supplied with a signal from the generator 17 of the cosine reference signal. After multiplying these signals in multiplier 2 and 25 and summing the received signals in the second adder 22, we get a signal of the form S Sm-sin ().

The amplitude Sm and the phase cf of this signal are equal to the amplitude and phase of the reverse component of the vibration displacement of the rotor 3. The amplitude of this signal is measured by an amplitude gauge 26, made, for example, as a peak voltmeter, and measure the phase

five

0

Phase 27, for example, a digital phase-time phase-meter. For this, the time interval, for example, between the falling edges of the sinusoids of the signals S and I, arriving at the signal and reference inputs of the phase meter 27, is filled with a sequence of pulses of the frequency multiplier 14, which arrives at the pulse input of the phase meter 27 and simultaneously at the frequency meter 28 displaying the rotation rotor 3.

Claims (1)

Invention Formula Device to control the maximum deviation of the rotor from the axis of the turbomachine aut. St. No. 1232833, characterized in that, in order to improve accuracy by determining the amplitude, phase and frequency of the reverse-component deviation, it is equipped with sinus and cosine reference signal generators connected in series by a second multiplier with two inputs, five 0 the first low-frequency filter and the third multiplier with two inputs connected in series by a fourth multiplier with two inputs, a second low-frequency filter and a fifth multiplier with two inputs, a second adder and frequency, amplitude and phase meters, with the inputs of the second and fourth multipliers connected respectively to the outputs of the first and second primary converters and connected to the output of the sine-wave reference signal generator, also connected to the inputs of the third multiplier and phase meter, the form inputs The sinus and cosine reference signals are connected to the tag sensor and to the output of the frequency multiplier, which is also connected to the inputs of frequency and phase meters, the output of the cosine reference signal generator is connected to the input of the fifth multiplier, and the outputs of the third and fifth multipliers are connected to the inputs of the second adder, the output of which is connected to the inputs of the phase and amplitude meters.