SU1296890A1 - Method of determining stiffness of bearing supports - Google Patents

Abstract

The invention relates to the field of diagnostics of mechanisms and machines and can be used to assess the technical condition of the bearing assemblies of turbines, compressors, gyromotors, etc. The aim of the invention is to increase the reliability of control of the rigidity of the bearing supports under operating conditions. Vibration sensors are installed on the bearing housing to measure the level of vibration in the vertical and transverse directions. By changing the angular velocity of rotation of the rotor, the machines set the angular velocities with the shaft, and so. These velocities are measured with an angular velocity sensor and an angular velocity indicator. The corrected amplitudes of oscillations in the direction under study are determined at angular velocities of rotation Q, and ca. The stiffness of the bearing support is determined by the appropriate formula. 1 il. with S (L

Description

1129

This invention relates to bearing spacing and can be advantageously used to determine the rigidity of bearing bearings.

The purpose of the invention is to improve the accuracy of measuring the stiffness of the bearings under operating conditions of

The drawing shows the model. the bearing unit and the block diagram of the device for drying

The bearing unit consists of a body of bearing body 1, shaft 2 of fasteners 3 and 4 ;, a bearing body with unknown stiffness. It is also assumed that shaft 2 has a fixed but previously unknown imbalance. The bearing housing 1 is equipped with vibration sensors 5 and 6 in vertical and transverse directions for measuring vibration levels. The sensors are connected to a narrow-band harmonic analyzer (UAG). Angular velocity sensor 7 is connected to an angular velocity indicator (IUS).

The method is carried out by the following 1m image.

By changing the angular velocity of the machine shaft, the shaft sets the angular speeds o, and CO,, the angular velocities (l), and iu, respectively, are the maximum and minimum angular velocities of the shaft rotation allowed during operation. Dp of each of the angular velocities Q, and from the vibration signals 5 measured by the sensors 5 and 6s are extracted with the help of a narrow-band amplitude harmonic analyzer

a, b, b harmonic components of the vibration of the bearing housing in the test direction and perpendicular to the test direction x corresponding to the frequencies f, 2П / cOi and f 2П / С02 ° The angular velocities oz, and ",, are measured using sensor 7 of angular velocity and the indicator of the angular soon ... stio Rigidity is calculated according to the forms: / - le

Where c

.) Ajo f - A, u |

support stiffness in the th m direction 5 effective mass U ,, Q ,, - angular velocity

in al JK (b |.

“Leo A. About IK / | Kg

m A - "1-K

am

harmonic components of the bearing housing vibration

K, K2

and (, in

l, bg

about

in the direction under study, corrected by taking into account the transverse sensitivity of the vibration transducers at angular velocities ω, and, respectively, the transverse sensitivity coefficients of the vibration transducers; ,

respectively, recorded vibration amplitude II amplitude oscillations at frequencies 2P / CO, and 2P / C02 in the following direction and perpendicular to it not corrected by taking into account the transverse sensitivity of vibration transducers “

35

45

The proposed method with a greater degree of reliability allows you to quickly and efficiently

25 control of the rigidity of bearing bearings of powerful turboagents 5, since the measurement of rigidity is carried out taking into account the operating conditions (temperature pejfMMj effect of connections

(structural elements of the unit with the bearing, change of communication parameters in the course of work).

Claims (1)

Invention Formula The method for determining the rigidity of the bearing supports 5 is enclosed in tbm, which measures the mass of the shaft and the amplitude of the oscillations of the bearing housing at two frequencies of oscillation, o, l and h 5 0 The accuracy of measuring stiffness in operation: oi s operating e, measuring az 1pluits is made in two mutually perpendicular associated radial directions at maximum and minimum operating speeds of rotation of the shaft at frequencies, its rotation s and rigidity is calculated using the formula .. . A.i - A, where C is the support stiffness in the research direction; m -.massa shaft; a, -k, b  l - i 1-К.К 2 ТЬК, К 1 Kg amplitude the harmonic components of the hull vibration in the direction of study5 adjust 311268 by taking into account the transverse sensitivity of vibration transducers at angular velocities xD) - accordingly minimal. with and maximum angular speed of rotation of the shaft in the working range; - coefficients of transverse sensitivity of vibration transducers; but respectively, vibration amplitudes recorded by vibrations at frequencies 2P / 6), and 2P / s, in the direction under study and perpendicular to it, not corrected by taking into account the transverse sensitivity of the vibration transducers. Compiled by T. Khromova Editor M. Nedoluzhenko Tehred I. Popovich 768/44 Circulation 777. Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4 h / / / / // // // / Proofreader M. Demchik