SU970127A1

SU970127A1 - Vibration rate meter

Info

Publication number: SU970127A1
Application number: SU813248019A
Authority: SU
Inventors: Владимир Иванович Петрович
Original assignee: Центральное Конструкторское Бюро "Главэнергоремонта"
Priority date: 1981-02-12
Filing date: 1981-02-12
Publication date: 1982-10-30

Description

Изобретение относитс к измерительной технике и предназначено дл измерени виброскорости гармонической вибрации.This invention relates to a measurement technique and is intended to measure the vibration velocity of a harmonic vibration.

Известен измеритель виброскорости , содержащий последовательно соединенные пьезоэлектрический преобразователь , предварительный усилитель , фильтр верхних частот, измерительный усилитель и последовательно соедиленные преобразователи посто нного напр жени в частоту, ключ, счетчик импульсов, цифровой индикатор, интегратор, вход которого соединен с выходом измерите .льного усилител , а выход - с входом преобразовател посто нного напр жени в чатоту и последовательно соединенные блок выбора интервала и блок управлени , которого соединен с упргшл юищм входом ключа 1 .A vibration velocity meter is known, comprising a piezoelectric transducer in series, a preamplifier, a high-pass filter, a measurement amplifier and serially connected constant-voltage-to-frequency converters, a key, a pulse counter, a digital indicator, an integrator, whose input is connected to the output. and the output is connected to the input of a DC / DC converter and a serially connected interval selection unit and a control unit, which one with the input key uprgshl yuischm 1.

Недостатком известного устройства вл етс низка точность, обусловленна наличием аналогового интегратора , работающего в узком диапазоне частот и имеющего большую погрешность в низкочастотном диапазоне вследствие дрейфа нул и разр да интегрирующей емкости.A disadvantage of the known device is low accuracy due to the presence of an analog integrator operating in a narrow frequency range and having a large error in the low frequency range due to zero drift and the discharge of the integrating capacitance.

Цель изобретени - повышение точности измерител .The purpose of the invention is to improve the accuracy of the meter.

Указанна цель достигаетс тем, что измеритель виброскорости, содержащий последовательно соединенные пьезоэлектрический преобразователь , предварительный усилитель , филЪтр верхних частот, измерительный усилитель и последо10 вательно соединенные преобразователь посто нного напр жени в частоту , ключ, счетчик импульсов и цифровой индикатор, снабжен последовательно соединенными фильтром This goal is achieved by the fact that a vibration velocity meter containing a series-connected piezoelectric transducer, a preamplifier, a high-pass filter, a measuring amplifier, and successively connected DC-to-frequency converter, a key, a pulse counter, and a digital indicator are connected in series with a filter.

15 нижних частот, вход которого соединен с выходом измерительного усилител , среднеквадратичны детектором , выход которого соединен с преобразователем посто нного на20 пр жени в частоту, и преобразователем синусоидального напр жени 3 пр моугольное, вход которого соединен с выходом фильтра нижних частот, а выход - с управл ющим The 15 low frequencies, the input of which is connected to the output of the measuring amplifier, are rms detector, the output of which is connected to a constant-voltage converter to frequency converter, and a sinusoidal converter 3 is rectangular, the input of which is connected to the output of the low-pass filter, and the output is from the manager

25 входом ключа.25 key entry.

На чертеже приведена блок-схема предлагаемого устройства.The drawing shows a block diagram of the proposed device.

Claims

Vibration velocity meter contains 30 piezoelectric transducer 1 connected in series, preamplifier 2, high pass filter 3, measuring amplifier 4, low pass filter 5, rms detector b, constant voltage to frequency converter 7, key 8, pulse counter 9, digital indicator 10. The meter also contains a sinusoidal-to-rectangular voltage converter 11, the input of which is connected to the output of the low-pass filter 5, and the output to the control input of the key 8. The slave meter melts follows. The vibrational signal is converted to electric in the piezoelectric transducer 1, fed to preamplifier 2, filtered by high pass filter 3, amplified in measurement amplifier 4, filtered by low pass filter 5 and rectified by rms detector b. The rectified signal is converted into a constant voltage converter 7 v-frequency (the frequency of impulses following its output is proportional to the vibration acceleration) and through the key 8 goes to the counter 9 pulses and digital indicator 10. From the output of the filter 5 lower frequencies-lepes A sinusoidal voltage converter into a rectangular sig is supplied to the control input of the key 8, which opens only for a time equal to half the period of the measured vibration. Therefore, the number of pulses on the digital indicator 10 is proportional to the vibration velocity. The use of the invention will increase the measurement accuracy by implementing a high-precision digital conversion of vibration acceleration into vibration velocity and will allow operation in a wider frequency range without first re-tuning the working setup. Invention: A vibration velocity meter comprising a series-connected piezoelectric transducer, a preamplifier, a high pass filter and a measurement amplifier, as well as a series-connected constant-voltage-to-frequency converter, a key, a pulse counter, and a digital indicator, characterized in that it is equipped with a series-connected low-pass filter, the input of which is connected to the output of the measuring amplifier, a root-mean-square detector The output of which is connected to the input of a constant-to-frequency voltage converter and a sinusoidal-to-rectangular voltage converter, whose input is connected to the output of the low-pass filter and the output to the control input of the key. Sources of information taken into account in the examination 1, Shkalikov B.C., Peplinec B.C., Isakovich E.G., Tsygan N.Ya. Measurement of vibration and shock parameters. M., Publishing House of Standards, 1980, pp. 181-182, fig. 82 (prototype):