JPS5811825A - Umbalance measuring method of high-speed turning rotor - Google Patents

Abstract

PURPOSE:To correct the unbalance of a high-speed turning rotor through one- time operation, by using the resonance frequency of the rotor, extents of static flection, umbalance vectors at left and right correction terminals of the rotor, and an eccentricity vector at the center correction part of the rotor. CONSTITUTION:To measure the unbalance of a rotor used in a high-speed turning state, the resonance frequency f0 of the rotor and extents deltaL and deltaR, and deltaM at the left and right correction terminals, and center correction part when a load F is applied to the rotor in a stationary state are measured firstly. Then, in a low-speed turning state, unbalance vectors UL and UR at the correction terminals and an eccentricity vector eLM at the center correction part are measured, and in an eccentricity vector eHM is measured. Those measurement data are used to calculate unbalance vectors UL* and UR*, and UM* at the left and right correction terminals, and center correction terminal of the rotor.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a rotor that is used in a high speed rotation state.
This article relates to a method for measuring the imbalance.

Generally, when a relatively long rotor is rotated at high speed, the rotor is deflected, and therefore, when correcting rotor unbalance, this deflection must be taken into consideration in order to correct the unbalance accurately. .

Conventionally, when correcting the unbalance of such a high-speed rotating rotor, the rotor is first rotated at a low speed, the unbalance vector is measured without taking into account any deflection caused by rotation, and the rotor is corrected according to this vector. After that, the rotor is rotated at high speed and the deflection is corrected again.

However, with such conventional means, there is a problem in that the unbalance correction work needs to be performed twice, which requires time and effort for the correction.

The present invention aims to solve these problems, and is designed to measure unbalance all at once, taking into account the deflection caused by rotation, so that the unbalance correction work can be completed in one go. The purpose of this invention is to provide a method for measuring unbalance of a high-speed rotating rotor.

The principle by which unbalance can be measured in one go, taking into account the deflection caused by rotation, will be explained next.

Now, calculate the unbalance vector that also takes into account the above deflection at each correction end on the left and right sides of the rotor and at the correction part in the center of the rotor.
Let L + TIR + IIM, and the unbalance vector at each correction end on the left and right sides of the rotor without considering the deflection is UL.
, TIR, the static balance and moment balance H(1) + (2) are expressed by the equation σ.

UL + UM + UR + VL + UR”” 0・
...(1) UL +2TIM +3UR1Uj +3UH-0・
(2) However, it is assumed that the distance from the rotor left correction end to the rotor center correction part and the distance from the rotor center correction part to the rotor right correction end are equal.

Further, the equation for the first-order mode balance is expressed by equation (3) and σ.

...(3) Here α1. α0. The amount of static deflection when a load F'z is applied to the rotor is δ1. with an influence coefficient on αR. δ8. δ, then α, −δL/F, Ctkl−δM/p, α, −δ1
It's now.

Also, ω is the angular frequency, and α is ω/ω0.

In addition, ω. is the resonant angular frequency of the rotor, and the resonant frequency wof.

Then, it is expressed as 2πfo.

6M is a vector representing the deflection, ``HM'' LM
It is expressed as

Note that t'HM and @LM represent the eccentricity vector of the correction section at the center of the rotor when the rotor is rotated at low and high speeds.

Therefore, when these equations (1) to (3) are expressed in a matrix, equation (4) is obtained.

...(4) With this, using Cramer's formula, UL, U1TI+
: can be asked at will.

Therefore, the method for measuring unbalance of a high-speed rotating rotor according to the present invention is suitable for measuring the unbalance of a rotor used in a high-speed rotating state.

The resonance frequency @fo of the rotor and the amount of static deflection δ5 at each of the left and right correction ends of the rotor and the center correction portion of the rotor when a predetermined load F is applied to the rotor in a stationary state. In addition to measuring δ□ and δ, while the rotor is in a low speed rotation state, the unbalance vector T1. , U, and at least the eccentricity vector (ILM l!) of the central correction section of the rotor.
: is measured, and the eccentricity vector of the rotor center correction section in the high speed rotation state of the rotor at the angular frequency ω is measured.
++mk measurements and these measurement data f. ,δ,.

δ8. δM + “1.+tIR+”LM and 6
The present invention is characterized in that the unbalance vectors TI:, tr': and TI are measured at each of the left and right correction ends of the rotor and the rotor center correction portion, which satisfy the following equation based on 11M.

here.

α, = δL/F, false = δM/F, α, = δR/Fα
=ω/ω0. ω. =2πfOl @M=@IIMe,
It is M.

Hereinafter, a method for measuring unbalance of a high-speed rotating rotor as an embodiment of the present invention will be explained with reference to the drawings.
The figure is a schematic diagram showing the static deflection amount measuring means of the rotor, FIG. 3 is a schematic diagram showing the eccentric vector measuring means of the rotor, and FIG. 4 is a schematic diagram showing the relationship between the input data and output data. It is a schematic diagram.

Now, an example of the unbalance measurement procedure using this method will be explained.

(1) How to obtain human power data (υ rotor 1
The resonant frequency f. Regarding the measurement method, as shown in FIG.

The vibration waveform detected by the non-contact pickup 4a of the vibration meter 4 is input to the synchroscope 5.

At this time, the output of the oscillator 6 with a variable oscillation frequency is input to the synchroscope 5, a Lissajous figure is displayed on the screen of the synchroscope 5, and the resonance frequency f of the rotor 1 is determined from this figure. Explore.

(2) Static deflection amount δ5 of rotor 1. δ8. Regarding the method for measuring δ1, as shown in Fig. 2, with the rotor l placed on the support stand 2.2, a load Fi is applied to the center of the rotor l using, for example, a weight, and each of the left and right sides of the rotor at this time is Correction end IL,
Static deflection amount δ1 of IR and rotor center modification portion IM.
δ1. Each δM is measured using a dial gauge 7.

(3) Regarding the method of measuring unbalance vectors TJL, UR and eccentricity vector LM under low rotor rotation state, unbalance peltle TIL, UR at each corrective end IL, ], R on the left and right side of the rotor is measured using a normal balancer. do.

Furthermore, the eccentricity vector eLJj at the correction part IM at the center of the rotor: The output of the vibration meter is put into a synchroscope and the magnitude is measured by reading between the peaks, and its direction is determined by the angle display meter of the balancer. Do what you measure.

In addition, for error checking, the eccentric vector eaLL + "LR" at each correction end IL, IH on the left and right of the rotor
Also measure at the same time.

(4) Regarding the method of measuring the eccentricity vector e□ when the rotor is rotating at a high speed. As shown in FIG. 3, the eccentricity vector IBnMk of the correction section IM at the center of the rotor is measured by rotating the rotor 1 at high speed at the full angular frequency ω.

That is, the signal detected by the non-contact pickup 4'a of the vibration 4' is input to the synchroscope 5' and the magnitude of the eccentric vector el1M is measured by reading between the peaks, and the angle display meter of the balancer is 8
, the direction of the eccentric vector "HM" is measured.

At this time, the rotation speed is detected by the sensor 9.

In this case as well, for error checking, the eccentricity vector at each correction end IL and IH on the left and right sides of the rotor is
``Measure your HR at the same time.

(II) Unbalance vector T that also takes into account deflection
IL.

”About the measurement method of R+ trM Input data f obtained by each method of (I). .

δ1. δ8. δ,, UL, TIR, eLM and @
aMk is input to the calculation means 10 shown in FIG. 4 to calculate the equation (4) and measure the unbalance vector "Try" to be obtained.

Unbalance vector Q obtained in this way, ,
Based on UR, UMK, each modified part IL, IR.

If correction is made for 1M, the unbalance can be corrected in one step, taking into account the deflection, and the time and effort required for fc correction can be greatly reduced.

Note that there are various ways to obtain input data.

The order in which they are taken may be arbitrary.

Furthermore, it is easy to assemble a simple measuring device by combining a sensor, a microcomputer, a suitable Tisgelley device, etc.

As detailed above, the unbalance measurement method for a high-speed rotating rotor of the present invention can measure the unbalance at once, taking into account the deflection caused by rotation, which reduces the amount of time it takes to correct the unbalance. This has the advantage of significantly saving time and effort.

[Brief explanation of the drawing]

The figures show a method for measuring unbalance of a high-speed rotating rotor as an embodiment of the present invention. Fig. 1 is a schematic diagram showing a means for measuring the resonance frequency of the rotor, and Fig. 2 shows the amount of static deflection of the rotor. FIG. 3 is a schematic diagram showing the measuring means, FIG. 3 is a schematic diagram showing the eccentricity Peltor measuring means of the rotor, and FIG. 4 is a schematic diagram for explaining the relationship between the human power data and the output data. ]# Rotor, LL, IR Souken rotor left and right correction ends,
] M...Rotor center correction part, 2. Support stand, 3... Wooden hammer, 4.4'... Vibration meter, 4 a, 4'a...
Pickup, 5,5' - Synchroscope, 6...
Oscillator, 7...Dial gauge, 8...Angle display meter, 9...Sensor, 10...Calculating means. Agent Patent Attorney Yoshihiko Iinuma Figure 1 Figure 2 Figure 2

Claims (1)

[Claims] When measuring the unbalance of a rotor used in a high-speed rotation state, first, the resonance frequency f of the rotor is determined. and the amount of static deflection δLlδ8 at each of the left and right correction ends of the rotor and the center correction portion of the rotor when a predetermined load F is applied from the same mouth to the evening when the rotor is in a stationary state. δ, and % in the low speed rotation state of the rotor. Unbalance vector 'lL of each correction end on the left and right sides of the above rotor
+UR and at least the eccentricity vector "LM" of the rotor center correction section, and furthermore, the angular frequency ω of the rotor is measured.
The eccentricity vector enyk of the rotor center correction section in the high-speed rotation state is measured, and these measurement data f. ,
δ1. δ8. δ1. UUR+ “LM and” IIM
The unbalance vector U at each of the rotor left and right correction ends and the rotor center correction part r that satisfies the following formula based on
A method for measuring the mismatch of a high-speed rotating rotor, which is characterized by measuring L+UR and lateral. Here, α, = δL/Fl false = δM/'Fl false = δR/Fα 2
ω/ωOI ω0: 2πf(1+ (IM""
'I'1M'LM