SU1559256A1 - Method of determining radial clearance in rotor bearings - Google Patents

Abstract

The invention relates to the bearing industry and can be used to determine the radial clearance in the rotor bearings. The purpose of the invention is to improve the accuracy of measuring the radial clearance in the bearings of the rotors. In the bearings, the rotating rotor excites attendant forced oscillations. The resonant frequency is determined from the amplitude of the vibrations. The radial clearance in the bearing is determined from the dependence connecting the radial clearance with the frequency of resonant mating oscillations of the bearing support. 3 il.

Description

The acquisition relates to the bearing industry and can be used to determine the radial clearance in the bearings. rotor.

The purpose of the invention is to improve the accuracy of measuring the radial clearance in the rotor bearings.

Fig. 01 is a diagram of the equipment for carrying out the method; figure 2 is a view of And figure 1; FIG. 3 shows the dependence of the radial clearance in the bearing on the natural frequency of the mating oscillations.

A vibration sensor 4 is located on the housing of the bearing support 1 having the shaft 2 of the rotor 3. The shaft 2 also has a movable part 5 of the sensor 6 of the frequency of rotation of the rotor shaft 3.

Vibrodztchik 4 is connected to the input of the amplifier 7, the output of which is connected to the recording device 8, the sensor 6 of the rotational speed of the rotor - to the input of the recording device 8.

The method is carried out as follows.

Smoothly increasing the frequency of rotation of the rotor 3 from the lower operating frequency of the rotor, corresponding to the lower part of the mating oscillations, to the upper operating frequency of the rotor, corresponding to the upper natural frequency of the mating vibrations, is measured with the help of sensor 6 and fixed to the recording device 8. At the same time, the signal received from the vibration sensor 4 is amplified in the amplifying device 7 and recorded on the recording device 8.

At coincidence of the forced frequency of rotation of the shaft 2 of the rotor 3 with the frequency of its own tandem kiosks i-bani

WITH

go

ate &

hip support 1 resonance of vibrations arises. At this point, fix the frequency of rotation of the shaft 2.

The dependence of the size of the radial clearance in the bearing, as a function of the frequency of natural oscillations of the bearing support, is determined by

formula

..

, № (G + P) I in - f z m

where 1 is half the radial clearance

in the bearing; G - weight bearing load

(support reaction as a component of rotor weight); P is the radial component of the load from the rotor drive mechanism; m - part of mass, reduced to

each rotor support; f is the frequency of natural oscillations of the bearing support

Substituted the frequency of natural oscillations of the bearing support 1, the rotor 3, equal to the resonant frequency, measured when the plane-varying forced frequency coincides

0

50

25, the rotation of the shaft 2 of the rotor 3 with the frequency of natural fluctuations of the bearing support 1 in the formula, determine the radial clearance in the bearing

The application of the proposed method for determining the radial clearance in the rotor shafts makes it possible to determine the radial clearance with greater accuracy, not only during the assembly of the bearing assembly, but also during operation with in-place diagnostics of the machine components.

Claims (1)

Invention Formula The method of determining the radial clearance in the rotor bearings, which consists in rotating the rotor at different speeds and measuring the amplitude of its vibration, characterized in that, in order to increase the measurement accuracy, the rotating oscillations of the rotor excite during rotation, measure their resonant frequency and its size determine the radial clearance. / -U t V 1