SU460435A1 - Method for measuring shaft deflection - Google Patents

Description

one

The invention relates to the field of measurement technology and can be used for balancing the elastic rotor systems.

Known cnocoi6 measurement of the deflection of the shaft, which is based on measuring the difference in the path of the rays in the reference and measuring arms, interteRferometer. With this, the rays traveling along the measuring arm are directed to the surface of the shaft, the bristle of which is measured, and the rays, and through the supporting arm, are directed to the fixed mirror of the interferometer.

However, when measured by a known method and the measuring device shows the magnitude of not only the deflection of the shaft, but also the magnitude of its non-placement in the onors on which it rotates. To isolate the prog-b shaft itself from its total displacement, complex electronic equipment is required, and Often this cannot be done.

The proposed method differs from the known one in that the beam, which runs along the support arm of the interferometer, is directed to the surface of the shaft, to a point near one of its supports.

Pa of the drawing shows one of the possible diagrams of the H and H rocket according to the proposed METHOD.

The opa contains a light source (O.G.G.) 1, a translucent mirror 2, a pivoting mirror 3, a photodetector 4, and a shaft 5 under study rotating at a speed w. On the surface of the shaft there is a point / 1 near one of its supports, where the beams going along the support arm of the interferometer are directed, and the point .6 where they measure the deflection and where the beams going along the measuring arm of the interferometer go.

Rays of light from source 1 direct light.

a translucent mirror 2, where each of them splits into two beams — a reference and a measuring one. The reference beams are sent to the surface 5 at point A with the nominal power of the rotary mirror 3. Point 6 is located in one of the shaft supports. A 1-1 measuring beam is directed to point B on the surface of the shaft, where its deflection is measured. The reflected beams passing through the mirror 2 create an ip tive pattern, which is fixed by the photo detector 4. If the shaft 5 moves in the supports, but does not bend, this causes a displacement of both points L and B of the shaft. Both shoulders are interchanged by the same wavelength, which does not cause the difference of xovia rays in the lines of the interfero: meter. Consequently, the output of the photodetector signal will not be. If shaft 5 bends and moves in supports,

Then the path difference of the rays in the interferometer arms appears from the shaft moving at point B relative to the section at point A. In this case, HF; BUT, and the cases of moving the shaft in Oparach ohm, the foam automatically increases, and the instrument shows only the amount of deflection.

The subject of the i6 Retetel and the Method of Measurement; Drobi of the shaft bend, base 1 on measuring the difference in the path of the rays in the reference and out of the shoulders of a Mierpa interfero, characterized in that, in order to increase the accuracy of the measurement, the rays are 5 olor The interferometer is guided to the noBeipXiEOCTb shaft at a point near one of its oP0; p.