SU1193474A1 - Arrangement for determining disbalance vector - Google Patents

Abstract

1. A DEVICE FOR DETERMINING A DISBALANCE VECTOR, containing in series an unbalance sensor, a synchronous detector — the output of which is intended to be connected to an imbalance indicator, a reference voltage source, whose input is connected to an unbalance sensor, and a flash lamp designed to indicate the location imbalance on the rotor, which is due to the fact that, in order to increase the performance of the balancing, the reference voltage source is fulfilled in the form of a series-connected adder, the first the input of which is the input of the comparator reference voltage source, pulse generator, pulse frequency multiplier and sinusoidal reference voltage generator, the output of which is the output of the reference voltage source and connected to the second input of the synchronous detector, and connected in series with the cosine of the reference voltage SS the input of which is connected to the output of a frequency multiplier (L pulses, multiplier, integrator and converter, the output of which is connected to the second Odom adder and the second multiplier input connected to a first input of an adder, a flash lamp connected to the output of the pulse shaper. 2. The device according to claim 1, so that, in order to increase the convenience of operation, it is equipped with a tag sensor and a phase meter, the first input of which is connected to the output of the pulse shaper, and the second input with a tag sensor .

Description

 I

The invention relates to a balancing technique and can be used to determine the unbalance vector of rotors, for example turbomachines.

The aim of the invention is to improve the performance of balancing.

FIG. 1. shows a block diagram of the device; FIG. 2 is a block diagram of a converter; FIG. FIG. 3 shows timing charts of the imbalance signal.

A device for determining an unbalance vector contains a series-connected unbalance sensor T, the synchronous detector 2, the output of which is intended to be connected to the unbalance indicator (not yet), the source 3 of the reference voltage, the input of which is connected to the unbalance sensor 1, and the output the input of the synchronous detector 2. The source 3 of the reference voltage is made in the form of connected sequence. Adder 4, the first input of which is the first input of the source 3 of the reference voltage, the comparator 5, the shape of the rapper 6 pulses, the multiplier 7 of the pulse frequency and the driver 8 of the sinusoidal reference voltage, the output of which is the output of the source of the reference voltage 3, and connected in series of the cosine-shaped reference voltage driver 9, the input of which is connected to the output of multiplier 7 of the pulse frequency, multiplier 10, integrator 11 and converter .1, the output of which is connected to the second input sum ora 4, and a second input of multiplier 10 is connected to the first input of the adder 4.

To determine the imbalance phase, the device contains a tag sensor, which receives the tag signal applied to the balanced rotor I4j phase meter 15, the first gathering of which is connected to the output of the pulse former 6, and the second to the sensor 13 of the mark. The unbalance position on the rotor can also be indicated with the help of a flash lamp 16 connected to the output of the driver 6 pulses.

The synchronous detector 2 is made in the form of serially connected second-multiplier 17, whose inputs are the inputs of synchronous

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a detector 2, and an integrator 18, the output of which is the output of a sync detector 2.

Converter 12 is made in vi, 5 de amplifier 19, connected to its output by comparators 20 and 21, controlled keys 22 and, 23, whose inputs are connected to the outputs of corresponding comparators, and block 24

0 analog memory, the input of which is connected to the outputs of the controlled keys 22 and 23.

The device works as follows.

15 The signal from the unbalance sensor 1 (for example, consisting of two components, imbalance and second harmonic) is fed to the input of the adder 4 and one of. multiplier inputs 17 and 10

20 (FIG. 3, I and 2). From the output of the adder 4, the sum signal (FIG. 3.1 o) (the signal from the imbalance sensor and the compensating signal) enters the comparator 5, where by going through the zero level to the region positive values are received, the signals from which to form-. a pulse cell 6 pulses a sequence of initial pulses

0 (fig.Z, 3 and II). This sequence. The pulses are fed to the input of the multiplier 7, the frequency of the pulses, where a sequence of pulses of higher frequency (3, 4 and 12) is formed (sufficient to form the reference signals using the stepwise approximation method, figs. 5, 13, 6 and 14). From the output of the multiplier 7 pulse frequency, the sequence of pulses

d ow (FIG. 3,12) is fed to the input of the shaper 8 of the sinusoidal reference signal and the shaper 9 of the cosine-shaped reference signal.

From the output of the imaging unit 8, a sinusoidal reference signal (Fig. 3, 13) is fed to multiplier 17 to multiply by a signal from the unbalance sensor. The resulting signal from the output of the multiplier 17 is fed to

integrator 18 of the in-phase unbalance component (FIG. 3, 7),

From the output of the imaging unit 9, the cosine reference signal (FIG. 3, 14) is fed to the multiplier 10, dl; 5 multiplied by the signal from the unbalance sensor (FIG. 3, 1.

The resulting signal from the output of the multiplier 10 to. Steps on integ5

Rator 1I quadrature components. imbalance, and from its output - into the converter 12, from the output of which the signal goes to one of the inputs of the adder 4 (Fig. 3., 9). - In the converter 12 (FIG. 2), the quadrature component (FIGS. 3, 8 and 16 of magnitude and sign) form a compensating signal (constant voltage), the magnitude and sign of which, with the signal from the unbalance sensor, compensates for an instantaneous value second / harmonic at the time of the zero level crossing by the imbalance signal (at this time, the sum of the instantaneous second harmonic value and the compensating voltage is zero, with the result that the quadrature component is also zero. The imbalance or magnitude and phase of the second harmonic at the input of converter 12 appears as a signal proportional to the quadrature component. This voltage is amplified by amplifier 19 and if the magnitude of the amplified voltage exceeds the threshold of one of the comparators 20 or 21 tuned to the same levels as but different in sign, a voltage appears at the output of the comparator 20 or 21, which opens the corresponding control key 22 or 23 and corrects the signal value in the analog memory element 24 (compensator present signal) as long as this change does not privede.t equality to zero quadrature component and therefore, the input signal transducer.

If the quadrature component at the output of the integrator 18 of the common-mode component of the unbalance sigPI is equal to zero

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Nal (voltage j is maximal and proportional to the magnitude of the unbalance vector (oig.3, 15).

Transition and transformation. 5 signals in the elements of the device are reflected in time diagrams (out of order 2 and memory, where diagrams 1–8 correspond to the signals generated in the device when there is no connection between pre-: 10 generator 12 and adder 4 (no compensation signal is sent to the adder).

Timing diagrams 9-16 (Fig. 3) correspond to the signals generated (5 in the device when there is a connection between the converter 12 and the adder 4 (it supplies a compensating signal to the adder).

The phase of the unbalance vector is measured by a phase meter 15 relative to the signal from the tag from the sensor 13 of the mark and is indicated on the rotor 14 by a flash lamp 16. The constant error in phase 90 caused by the signal from the driver 6 of the pulses corresponds to zero of the in-phase unbalance component; on the scale of the phase meter 15, selecting the appropriate position of the flash lamp relative to the rotor.

The device for determining the unbalance vector allows to increase the performance of the balancing, as it does not require special adjustment when switching to another balancing frequency and can work at frequencies of the infrasonic range (3-4 Hz.

Introduction of a phase meter to a device allows you to connect Q control units to it to automate the balancing process (the corresponding outputs are shown in the diagram), such as a computer, which also allows you to increase the performance of the balancing process.

Claims (2)

1. DEVICE FOR DETERMINING THE UNBALANCE VECTOR, containing a series-connected unbalance sensor, a synchronous detector, the output of which is intended to be connected to an unbalance value indicator, a source - a reference voltage, the input of which is connected to an unbalance sensor, and a flash lamp designed to indicate the place of the unbalance on the rotor , characterized in that, in order to increase the balancing performance, the reference voltage source is made in the form of an adder connected in series, the first input of which is the input of the comparator reference voltage source, pulse shaper, pulse frequency multiplier and sinusoidal reference voltage shaper, the output of which is the output of the reference voltage source and connected to the second input of the synchronous detector, and connected in series with the cosine reference voltage shaper, the input of which is connected to the output frequency multiplier SS pulses, multiplier, integrator and converter, the output of which is connected to the second input of the adder, and the second input of the multiplier is connected to the first input of the adder, the flash lamp is connected to the output of the pulse shaper. '' 2. The device according to p. Characterized in that, in order to increase the convenience of operation, it is equipped with a tag sensor 'and a phase meter, the first input of which is connected to the output of the pulse shaper, and the second input with a label sensor. SU ... J193474