SU724934A1 - Torsional vibration measuring device - Google Patents

Description

one

The invention relates to a vibration measuring technique and can be used to measure torsional vibrations, such as shafts.

A torsional vibration meter is known that contains a measuring shaft with a connecting mechanism and a rotation uneven indicator kinematically associated with the measuring shaft 1. The difference in the movements of the elements of the gauge is fixed by a special mechanical device.

Its disadvantage is the low measurement accuracy due to the large number of parts.

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

For this, the proposed torsional oscillation meter is equipped with an additional shaft with unbalance at one end and a double Tuka hinge at the other, connected to the measuring shaft and a supporting podshchitnik covering the additional shaft, and the indicator is designed as an adjustable spring cooperating with the supporting handler and registering devices with a strain gauge mounted on a nlosa li, gin.

The drawing schematically shows the meter torsional vibrations.

The device comprises a measuring shaft 1 with a connecting mechanism and a kinematically connected indicator of non-uniformity of rotation kinematically with the measuring shaft 1.

The device is equipped with an additional shaft 2 with an unbalance 3 at one end and a double hinge 4 Hooke - at the other, connected to the measuring shaft 1 and the thrust bearing 5, covering the additional shaft 2. The indicator is implemented in a view that interacts with the support sub-holder 5 of the chassis spring of adjustable length recording device 7 with a strain gauge 8 mounted on a flat spring 6.

Works meter torsional vibrations as follows.

The measuring shaft rotates at a speed of

O) soo + sin,

where io is the nominal angular velocity of the shaft; A is the angular increment amplitude.

speed; V is the frequency of torsional vibrations.

To determine the frequency of torsional vibrations, it is necessary to determine the frequencies

V + CU and V - 0.

From the converted formula

LShsso / l; LShOSOSSH (,

X sin (v + ")) g- + sin (v - (")

here l m g,

where t is the mass of unbalance 3;

g - the value of its eccentricity.

In the device, this is accomplished by changing the length of the flat spring 6 during the measurement.

The torsional vibrations of the additional shaft are converted into vertical vibrations of the support bearing 5 and the flat spring 6.

In this case, for two positions of the spring, the natural frequency of which is equal to -v + co and V-th, resonance will occur. The strain gauge 8 transmits electrical signals proportional to the oscillations of the spring to the recording device 7. At the same time, an increase in the accuracy and reliability of measurements is achieved due to a new constructive implementation of its components.

An advantage of the invention is to improve the accuracy and reliability of measuring torsional vibrations.

Claims (1)

Invention Formula A rotational oscillation meter containing a measuring shaft with a connecting mechanism and a rotation unevenness indicator kinematically associated with the measuring shaft, characterized in that, in order to improve accuracy, it is equipped with an additional unbalance shaft at one end of it and Hooke’s double joint at the other connected with the measuring shaft and the bearing sub-frame covering the additional shaft, and the indicator is designed as a flat spring interacting with the support bearing of adjustable length and registering of devices. strain gauge mounted on a flat spring. Sources of information taken into account in the examination 1. Svetlitsky V. A. Collection of problems on the theory of oscillations. M., “Higher School, 1973, fig. 65, p. 39 (prototype). ww