SU1350513A1 - Device for determining disbalance vector - Google Patents

Abstract

This invention relates to balac. sirovochnoy technology. The aim of the invention is to improve the accuracy by increasing the sensitivity of the device to the imbalance vector selection. The signal from vibration sensor 2 passes through a synchronous detector 3, connected to the source 7 of reference voltages, to the unbalance indicator. The capacitance of the pulse counter 14 determines the number of steps for approximating the reference stresses. The phase of the measured signal is determined in the phase measurement circuit 17, which is connected to the tag sensor 6 and the source 7 of the reference voltages. I zp f-ly. 2 il .. I (L with SP: n with

Description

1350513

This invention relates to balancing fa

and can be used to determine the rotor imbalance vector, for example, the turbomachine

The purpose of the invention is to improve the accuracy by increasing the sensitivity of the device to isolating the unbalance vector by forming reference voltages (sine and cosine) from the mark on the rotor and controlling the change in the frequency multiplication factor of the pulses forming the reference voltages;

Figure 1 shows the structural diagram of the device; Fig. 2 is a block diagram of a pulse frequency multiplier with a variable multiplication factor.

The device for determining the unbalance vector of the rotor 1 contains in series an unbalance sensor 2 and a synchronous detector 3, made in the form of a serially connected multiplier 4 and integrator 5 of the common-mode component, a sensor 6, a reference source 7, made in the form of a pulse frequency multiplier 8, sequentially connected to the second multiplier 9, the input of which is connected to the output of the unbalance sensor, and the integrator 10 quadrature components connected to its output of the comparator 1 1, comparator 1 2 pluses and comparator 13 minus, the outputs of which are soy. Dineny with the corresponding inputs of the multiplier 8 pulse frequency, the pulse counter 14 and connected to its information output shaper 15 and 16 sinusoidal and cosine-like reference voltages, the outputs of which are connected respectively to the second inputs of the first and second multipliers 4 and 9, and the circuit 17 measuring phase, made in the form of serially connected trigger 18, the first input of which is connected with interconnected sensor 6 output of the tag, the input of the multiplier 8 pulse frequency and the second inputs of the integrators 5 and 10 in-phase and quadrature Component, and the second - with the skew output of the pulse counter 14, the second pulse counter 19, the second pulse connected to the output of the pulse frequency multiplier 8 and the input of the first circuit

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Chika 14 nmiulsoB, and indicaty 20 phase.

A multiplier 8 of a frequency of pulses with a variable multiplication factor can be made in the form of a series-connected quartz oscillator 21, a frequency divider 22, a synchronization circuit 23, the output of which is the output of a multiplier 8 of a pulse frequency, and a multiplier counter 24 serially connected by a second synchronization circuit 25, the first input of which is connected to the output of the frequency divider 22, and the second is the first input of the multiplier 8 of the pulse frequency, the delay circuit 26, the binary counter 27, the memory circuit 28, the second the course of which is connected to the input of the delay circuit 26, and the comparison circuit 29, the second input of which is connected to the output of the counter 24 of the multiplier, the uncontrolled frequency divider 30, the input of which is connected to the second output of the frequency divider 22, the control inputs to the outputs of the comparators P-13 and the output is with the second input of the binary counter 27.

The device works as follows.

The sensor 6 tags generates pulses from the tags, which are fed to the input of the frequency multiplier 8. At the output of the frequency multiplier 8, a sequence of pulses is formed with the frequency necessary for the formation, for example, by the method of step-wise approximation of optical signals. This sequence of pulses arrives at the counter of 14 pulses, whose capacity is equal, for example, to the number of approximation steps of the reference signals. The information outputs of the pulse counter 14 drive the shaper 15 of a sine wave and the shaper 16 of the cosine-reference voltage. Formed sigal and cosine-shaped voltages from shapers 15 and 16, respectively, are fed to the corresponding input of multipliers 4 and 9. To the other inputs of multiplier 4 and 9, the vibration signal of the rotor 1 comes from unbalance sensor 2. integrators 5 and 10 of in-phase and quadrature components, to the other inputs of which signals are received from sensor 6 of the mark. At the outputs of integrators 5 and 10, the in-phase and quadrature components of the unbalance signal are formed, respectively. The signal of the quadrature component from the output of the integrator 10 is fed to the inputs of the comparators 11-13 zero, plus and minus, which output single signals depending on the magnitude and sign of the quadrature component. From the outputs of the comparators 11-13, signals are fed to the controllers of the frequency multiplier 8 with a variable multiplication factor. The frequency multiplier 8 (Fig. 2) from the sensor 6 of the tag enters a pulse signal with a frequency fg, which after synchronization in circuit 25 with a frequency f through a delay circuit 26 is input to the Reset of the controlled counter 27, the counting input of which is received pulses from the output of the frequency divider 30 with the following frequency f „/ Kz - The number of pulses accumulated during the time period Tgjj 1 / fj, from the control counter 27 enters the form of a binary binary code to the input of the memory circuit 28 and on the leading edge of the signal The frequency fg is recorded in memory circuit 28. . With the same signal, delayed in delay circuit 26, the counter 27 is reset to zero, and the latter begins to accumulate the pulses arriving at its input (measure the next period T). Thus, from the output of the circuit

At the input of the comparison circuit 29, the digit binary code of the number r is proportional to the duration of the period T of the frequency to be multiplied (N ,, T „. €„ / K). On - the input of the counter 24 multiplier pulses arrive with a frequency f and the number N accumulated in it in binary. the code goes to another input of the circuit

29, at the output of which, when the number N reaches the value of the number, the logical signal arriving at the synchronization circuit 23 is exceeded. With the arrival of these pulses at the output of the synchronization circuit 23, pulses f, |, ix appear, reset the multiplier counter 24 into the initial state, and the latter begins again to count the pulses f, arriving at its input. Each reset to zero of the counter 24 multiplier corresponds to the issuance of one pulse per frequency multiplier 8. The frequency of the trace

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Thus, from the signals of the comparators 12 and 13, arriving at the inputs of the frequency divider 30, the multiplication factor of the multiplier 8 is set to be more or less than the capacitance of the pulse counter 14, which in turn determines the number of approximation steps of the reference voltages until the quadrature component from the output the integrator 10 will not become zero, and then the comparator II will set the multiplier of the multiplier 8 frequency equal to the capacity of the counter 14 pulses. At this moment, the signal at the output of the integrator 5 of the in-phase component is maximum and proportional to the magnitude of the unbalance vector.

The phase of the unbalance vector is measured by the phase measurement circuit I7, signals from sensor 6 marks come to the input of trigger 18, which opens the temporary gate of the second pulse counter 19 of the trigger 18, and pulses of pulse counter 14 arrive at the other setup input of the trigger 18. For the formed time interval, the number of pulses from the output of frequency multiplier 8, proportional to the phase of the unbalance vector, is counted in the pulse counter 19. This number is output to the display circuit 20.

The advantage of the proposed device is an increase in sensitivity due to the introduction of a frequency multiplier with a variable multiplication factor, as well as the possibility of performing harmonic analysis of the vibration components regardless of their ratio with measuring the magnitude and phase of these components when controlling the value of the delegator coefficient with a variable division factor produced computer or operator.

In addition, measurement accuracy can be achieved by making the device completely digital.

Claims (2)

1. Device for determining g unbalance vector, containing in series connected vibration sensor, multiplier and integrator of in-phase component, the output of which is intended to be connected with the decree the unbalance magnitude body, the pulse frequency multiplier, the second multiplier connected in series, whose input is connected to the unbalance sensor output, and the quadrature component integrator. Sine-wave and cosine-shaped reference voltage formers, the outputs of which are connected to the second inputs of the respective multipliers, a compiler and serially connected sensor tags and a phase measurement circuit, characterized in that, in order to increase accuracy by increasing sensitivity, it is equipped with a counter pulses, the information output of which is connected to the inputs of the sinusoidal and cosine waveform shapers, and the transfer output to the second input of the phase measurement circuit Oromo plus and minus comparator. Compiled 10. Editor Kruglev S. Patrusheva Tehred L. Oliynyk Order 5277/41 Circulation 776 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Design, 4. 136 the inputs of which are connected to the interconnected input of the comparator and the output of the second multiplier, the pulse frequency multiplier is made with a second multiplication coefficient, its first input is connected to the output of the tag sensor and the second inputs of both integrators, the second, third and fourth outputs of the corresponding comparators, and the output is with the input of a pulse counter and the third input of the phase measurement circuit. 2. The device according to claim 1, wherein the phase measurement circuit is made in the form of a series-connected trigger, whose inputs are the first and second inputs of the phase measurement circuit, the second pulse counter, the second input of which is is the third input of the phase measurement circuit and the phase indicator. Proofreader G. Reshetnik