JPS60220827A - Vibration analyzing apparatus - Google Patents

Abstract

PURPOSE:To simplify a circuit constitution to reduce cose and also to reduce a trouble rate by providing two pcs. of integrators and an amplitude calculator and phase calculator to input simultaneously the respective output of these each multiplier. CONSTITUTION:A vibration analyzing apparatus calculates a vibration amplitude A by an amplitude calculator 14 from the output of two pcs. of integrators 13a, 13b and calculates a phase difference B by a phase calculator 15, and both of them are outputted. In this case detecting signals of two pcs. of displacement detector 11a, 11b can be regarded as a sinusoidal wave, consinusoidal wave having a phase difference of 90 deg., and are multiplied with a multiplier 12a, 12b by a vibration signal X detected with a vibration detector 2, and a Fourier transformation is performed by passing through the integrator 13a, 13b, then a vibration amplitude A=[XR(W)<2>+X1(W)<2>]<1/2> phase difference B=tan<-1>[X1(W)/ XR (W)] are calculated by the phase calculator 15 and outputted. Consequently a tracking analysis of a rotary body is possible with a simple circuit constitution and the apparatus is reduced its cost.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration analyzer, and is particularly applicable to a shaft vibration analyzer of a rotating body such as a steam turbine, a vibration analyzer of a structure caused by the rotation of a rotary body such as ship vibration, etc. This invention relates to a vibration analyzer.

A conventional example of this type of vibration analyzer will be explained with reference to FIG. What is shown in FIG. 1 is a configuration example of a vibration analysis device using a tracking filter, in which a vibration signal detected by a vibration detector 02 is inputted to one input terminal of a tracking filter 04, and the other input terminal of the tracking filter 04 is inputted to one input terminal of the tracking filter 04. The rotation signal detected by the rotation detector 03 from the rotating body 01 is input to the rotation body 01 . The output of the tracking filter 04 is input to the amplitude calculator 05 and the phase meter 06.
The rotation signal from the rotation detector 03 is also input to the phase meter 06, and the phase difference output B between the rotation signal and the vibration signal is output.

In the apparatus for analyzing vibrations of the rotating body 01 shown in FIG. 1 and vibrations of structures caused by the rotation of the rotating body 01,
The center frequency of a tracking filter 04, which is a type of band-pass filter, is constantly adjusted according to the number of rotations using the rotation signal No. 1. By passing the vibration signal from the vibration detector 02 through this, a sinusoidal vibration signal having a rotational frequency component is obtained. This signal is converted into an amplitude wave p, a direct current δ proportional to the vibration amplitude is converted into a voltage A by a device 05, and a phase meter 06
Determine the phase difference between the sinusoidal vibration signal and the rotation signal by
This is converted into a DC voltage B proportional to this.

However, in the device shown in the above-mentioned conventional example, the tracking filter, phase needle, etc. have drawbacks such as being expensive because of their complicated circuit configurations, and having a high failure rate due to the large number of elements. It has been difficult to apply it as a monitoring device due to issues of both safety, cost, and reliability.

The present invention was proposed in view of the above circumstances, and its purpose is to provide a vibration analyzer that has a simple and inexpensive configuration and can operate stably over a long period of time. .

The vibration analyzer according to the present invention includes two displacement detectors each mounted at an angle of 90 degrees in the circumferential direction and facing the circumferential side surface of a disk eccentrically mounted on a rotating body, and two displacement detectors each mounted at a 90 degree angle in the circumferential direction. two multipliers each inputting the displacement signal of each one of the displacement detectors separately to the input terminal of the input terminal, and inputting the vibration signal to the other input terminal of the two multipliers; The q# characteristic is that it is equipped with two integrators that input, and an amplitude calculator and a phase calculator that simultaneously input each output of each of these integrators,
Two sine waves with a phase difference of 90 degrees are generated by a disc mounted eccentrically on a rotating body and two displacement detectors mounted at an angle of 90 degrees facing the circumferential side of the disc. , respectively, by multiplying and integrating vibration signals to obtain components corresponding to the real part and imaginary part by Fourier transform, thereby making it possible to eliminate the above-mentioned drawbacks of the conventional method.

An embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a diagram showing the configuration of an embodiment of the present invention, and FIG. 3 is a plan view taken along line I-1 in FIG. 2 in the direction of the arrow.

In FIGS. 2 and 3, 1 is a rotating body, 2 is a vibration detector, 10 is a disk, 11&, 11b is each displacement detector, 1
2*, 1; 2b is each multiplier, 13m, 13b is each integrator, 14 is an amplitude calculator, and 15 is a phase @ calculator.

As shown in Fig. 2 and Fig. 3, a 90°
24-degree displacement detector 11 mounted at an angle of
The outputs of a and llb are input to multipliers 12h and 12b, respectively. The output of the vibration detector 2 is also input to each of these multipliers 12m and 12b. Each multiplier 12IL, 12
The outputs of b are input to integrators 13h and 13b, respectively. An amplitude calculator 14 calculates a vibration amplitude A, and a phase calculator 15 calculates a phase difference B from the outputs of the 21st integrators 13m and 13b.

The operation of the above embodiment of the present invention will be explained.

In FIGS. 2 and 3, a disc 1o is eccentrically mounted on a rotating body 1, and two displacement detectors 11a and 11 are mounted at an angle of 90 degrees facing the side surfaces of the disc 1o.
100 rotational displacement of the disk is detected by b. This disk 1o
The rotational displacement becomes sinusoidal when the amount of eccentricity is several percent or less with respect to the diameter of the disk 10. Therefore, the detection signals of the two-marrow displacement detectors 11m and Ilb are sinusoidal signals with a phase difference of 90 degrees, that is, sine waves (81n vrt ).
, can be regarded as a cosine wave [Cos wt]. This is multiplied by the vibration signal EX) detected by the vibration detector 2 using multipliers 12m and 12b, and the integrators I Ja and I J have a smoothing circuit function set to an arbitrary time constant.
By passing through b, the Fourier transform 'J is given by the following equation.

X 16F) - x (t) * Coo wt lower Xx &) = +, E4oz (t) #81n wt where xR←); Fourier transform real part X, ←); Can be an analog circuit equivalent to Fourier transform imaginary part .

From this, the vibration amplitude A The amplitude calculator 14 calculates the phase difference B. is calculated by the phase unit n unit 15 and output.

As described above, according to the present invention, it is possible to perform tracking analysis of the rotational speed component of a rotating body with a relatively simple circuit configuration such as a multiplier and an integrator, and also to provide an inexpensive and highly reliable vibration analysis device. It is something that can be effective.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of a conventional example, Figure 2 is a diagram showing the configuration of an embodiment of the present invention, and FIG. 3 is a plan view taken along the line T in FIG. 2 in the direction of the arrow. . 1...Rotating body, 2...Vibration detector, 10...Disc, 11*, 11b=displacement detector, 12m, 12b...
Multiplier, 13a, 13b... Integrator, 14... Amplitude calculator, 15... Phase calculator.

Claims (1)

[Claims] Two displacement detectors are mounted at an angle of 90 degrees in the circumferential direction so as to face each other on the circumferential side surface of a disc mounted eccentrically on the rotating body, and the above-mentioned displacement detector is attached to one input end of each of the displacement detectors. two multipliers into which the displacement signal of one side is separately input, and the vibration signal is input into the other input terminal, and two multipliers into which the outputs of each of these multipliers are input separately, respectively.
1. A vibration analysis device characterized by comprising: integrators, and an amplitude calculator and a phase calculator which simultaneously input the respective outputs of these integrators.