SU1211614A1 - Method of determining body unbalance - Google Patents

Abstract

This invention relates to a measurement technique and can be used in determining body imbalances. The purpose of the invention is to improve the measurement accuracy by reducing the effect of friction in the suspension axis. An unbalanced body is reported by an earth oscillations around an axis fixed in a suspension, which is reported to be rotated around an axis perpendicular to the body's swing axis. The period of the body oscillations is measured. Then a test load is fixed on the body in the desired place, the periods of oscillations are measured at two unequal angular rates of rotation of the suspension. Using the three oscillation periods found, calculate the imbalance. uh li

Description

This invention relates to a measurement technique, and may be used in determining body imbalances.

The aim of the invention is to improve the measurement accuracy.

The method is implemented as follows.

An unbalanced body is communicated by vibrating oscillations around an axis fixed in a suspension, which is reported to be rotated around an axis perpendicular to the body's swing axis, with

angular velocity fi .:,

The period of the body oscillations is measured. Then, a test weight with a mass t at a distance t from the axis is attached to the body in a hard place and the oscillation periods are measured at two unequal angular velocities L 7 and L 3 of the suspension rotation.

Using the found values of oscillations T

one

and T.

J

calculate the DC imbalance of the test body using the formula

В- | - {.ТГЧх-Т п Е {1у-id Т М,) ЦЖЧх-Т,,

- (I, -I) T3M (filT -jQni)} 4V (lV-J3 T) fT (,

.

where TX, ly, Ij are the moments of inertia

axle load

Oh, Oy, og;

tpc test weight

In another case, the period of oscillation of the body with the test load is measured at the angular velocity of rotation of the suspension.

equal to Л,, and the periods of oscillations of the body without test load T and Tj are measured during rotation of the suspension with angular velocities -Qs. The imbalance of the body is written by the formula

, -T, (Iv-lz)

 mlV-rj. gTjHS tT -, -)

where IxjIyjlT. moments of inertia of the test load relative to the axes Ox, Oy, 0. Post rotation of the suspension reduces the friction in the axis of Lodves and thus increases the sensitivity of the method.

Claims (1)

Invention Formula The method of determining the imbalance of the body, which implies that the body is installed in the suspension, informs it the tandem oscillations, measures the periods of oscillation of the body with and without a test load, taking into account which the amount of imbalance is determined by In order to improve accuracy, the body suspension is rotated around an axis perpendicular to the body's swing axis, or the second oscillation period of the body with a test load is measured at an angular rotational speed of the suspension that is different from the rotational speed of the suspension when the first period is measured. body with a test load. or measure the second period of oscillation bodies with an angular velocity of rotation of the suspension, different from the speed of rotation of the suspension when measuring the first period of oscillations of the body, and taking into account the measured period of oscillations of the body, calculate the imbalance of the body.