SU868367A1

SU868367A1 - Device for measuring radial vibrations of shaft

Info

Publication number: SU868367A1
Application number: SU772545518A
Authority: SU
Inventors: Ромуальдас Генрико Наумавичюс; Повилас Антано Варанаускас; Ромуальдас Ромуальдо Каупелис; Казимерас Миколо Рагульскис
Original assignee: Каунасский Политехнический Институт Им. Антанаса Снечкуса
Priority date: 1977-11-21
Filing date: 1977-11-21
Publication date: 1981-09-30

Description

(54) УСТРОЙСТВО ДЛЯ ИЗМЕРЕНИЯ РАДИАЛЬНЫХ ВИБРАЦИЙ ВАЛА(54) DEVICE FOR MEASURING RADIAL VIBRATIONS OF SHAFT

I ,I,

Изобретение ехтноситс к виброизмеритепьной технике и может быть испопьЗовано при измерени х вибрации вала, например , лентопрот жных механизмов, устройств точной магнитной записи и восщо- изведени сигналов.The invention relates to vibration-sensing technology and can be used to measure shaft vibration, for example, tape mechanisms, devices for precise magnetic recording and signal reconstruction.

Известно устройство дл измерени радиальных вибраций вала, содержащее два датчика. Датчики расположены по периметру на одной плоскости и подключе- ц ны к схеме исключени вли ни неровности поверхности шейки вала Ll3 .A device for measuring the radial vibrations of a shaft, comprising two sensors, is known. The sensors are located around the perimeter on the same plane and are connected to the circuit for excluding the influence of the unevenness of the shaft neck surface Ll3.

Недостатком устройства вл етс низка точность измерени из-за вли ни перекоса шейки на результат измерени . fjThe drawback of the device is low measurement accuracy due to the effect of cervical skew on the measurement result. fj

Известно также устройство дл измерени радиальных вибраций вала содерг жащее три датчика, подключенных к 6inoKy вычитани и сумматору . Недостатками указанного устрюйства вл етс низка точность измерени из-за вли ни перекосов вала, когда точка оси перекоса не находитс в середине образующей вала.It is also known a device for measuring the radial vibrations of a shaft containing three sensors connected to a subtractor and 6inoKy subtractor. The disadvantages of this device are low measurement accuracy due to the influence of shaft misalignments, when the skew axis point is not in the middle of the shaft generator.

Наиболее близким по технической сущности к предлагаемому вл етс устройство дл измерени радиальных вибраций вала , содержащее два датчика, последовательно соединенные с первым из них линию задержки, блок вычитани , дополни- тельный вход которого подключен к второму датчику, интегратор и регистратор Гз.The closest in technical essence to the present invention is a device for measuring radial vibrations of a shaft, comprising two sensors connected in series with the first of them a delay line, a subtraction unit, whose additional input is connected to the second sensor, an integrator and a Gz recorder.

Недостатком известного устройства вл етс низка точность измерени из-за вли ни изменени положени оси перекоса шейки.A disadvantage of the known device is the low measurement accuracy due to the influence of a change in the position of the skew axis of the neck.

Цель изобретени - повыщение точности измерений.The purpose of the invention is to increase the accuracy of measurements.

Claims

This goal is achieved by the fact that the device is equipped with two additional sensors, the first of which and the sensor connected to the delay line are designed to be mounted on one pattern, X) shaft, and the other two gauges on the other generator of this shaft with the first of the additional sensors of the additional delay, the second subtraction unit, the auxiliary input of which is connected to the second additional sensor, the third subtraction unit, the auxiliary input of which is connected to the output of the first block and the subtractor, an additional integrator, a multiplier and a fourth subtraction unit, the auxiliary input jcoToporo is connected to the output of the main integrator, and the output is connected to the recorder. FIG. 1 shows a functional (device circuit; Fig. 2 shows the location of the sensors above the shaft surface. The device contains two sensors 1 and 2 connected in series with the first of them a delay line 3, subtraction unit 4, the auxiliary input of which is connected to the second sensor 2, integrator 5 and recorder 6. The device is equipped with two additional sensors 7 and 8, the first of which and sensor 1 are designed for installation on one generating shaft 9, and the other two sensors 2 and 8 on the other generator of this shaft 9 connected in series with the first m from the additional sensors 7 to the complementary delay line 10, the second subtraction unit 11, the additional code of which is connected to the second additional sensor 8, the third subtraction unit 12, whose additional input is connected to the output of the first subtraction unit, the additional integrator 13, the multiplier 14 and the fourth block 15, the auxiliary input of which is connected to the output of the main integrator 5, and the output to the recorder 6. The device operates as follows. When the shaft 9 is rotated, radial vibrations and oscillations of the skew are created. CL With the help of sensors 1,2,7 and 8, the total oscillations are indicated are converted into electrical signals. The signals of sensors 1 and 7 are delayed by lines 3 and 1O of the hold, respectively, at time 7j and. V-, 2. Ug and VA are the linear velocities of the measured points of the shaft 9 ;. D l is the distance between sensors 1 and 2; D Ho is the distance between sensors 7 and 8. The delayed signals from sensors 1 and 7 are subtracted by blocks 4 and 111, respectively, from the signals of sensors 2 and 8, and the output signals from blocks 4 and 11 are read from each other in block 12, by subtractors. The output of block 10 is integrated by integrator 13 and multiplied by multiplier 14 by the ratio of the distance b from the point O, around which the skew occurs, cL, t, e. from the place of fixing the shaft 9 to the twist knot (not shown), to the place of installation of sensors 1 and 2 to the distance P between parallel planes where sensors 1, 2 and 7, 8 are located. In parallel, the output signal of block 4 is integrated by integrator 5 and is fed to block 15, to another input of which is output the signal of multiplier 14. The output signal of block 15, which is a signal of shaft radial vibrations, is fed to recorder 6. Thus, the device allows to increase the measurement accuracy, since it includes the effect of the unevenness of the shaft surface at an unknown position of the shaft skew axis. Claims An apparatus for measuring radial vibrations of a shaft, comprising Two sensors connected in series with a first one of a delay line, a subtraction unit, the auxiliary input of which is connected to a second sensor, an integrator and a recorder, characterized in that two additional sensors, the first of which and the sensor connected to the delay line, are designed to be installed on one forming shaft, and the other two sensors - on the other. additionally connected to the first of the additional sensors by an additional delay line, a second subtraction unit, the auxiliary input of which is connected to the second additional sensor, a third subtraction unit, the auxiliary input of which is connected to the output of the first subtraction unit, an additional integrator, a multiplier and a fourth subtraction unit, whose additional input connected, to the output of the main integrator, and output to the recorder. Sources of information taken into account during the examination 1. USSR author's certificate No. 280895, cl; Q 01 H 11 / OO, 1969.

2. USSR author's certificate number 417833, cl. Q 11 B 5/58, 1972.

3. USSR author's certificate for application No. 2538798 / 18-28, cl. Q 01 H 9/00, 1977 (prototype).

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