SU494623A1 - Device for contactless measurement of vibration parameters - Google Patents

Description

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The invention relates to the field of motion measurement.

Devices for non-contact measurement of vibration parameters are known, comprising an eddy current sensor with measurement and excitation windings electrically connected to different frequency generators, filters and measurement units.

However, such devices do not allow simultaneous measurement of vibration, the movement of the rolls of the object being monitored.

In order to eliminate this drawback, the proposed device is equipped with a two-coordinate angle gauge connected via filters to the output of the measuring winding of the sensor, and a displacement measuring unit electrically connected with the output of one of the field windings. In this case, the measuring winding is located symmetrically and orthogonally with respect to the excitation windings, made in the form of eights with mutually perpendicular axes of symmetry.

Pa figs. 1 is a block diagram of the device; in fig. 2 shows the layout and arrangement of the field windings and the measurement of the eddy current sensor.

The device consists of variable frequency generators 1 and 2, motion measurement units and vibration parameters 3 and 4, filters 5, 6, two-coordinate angle meter 7 and an eddy current sensor 8. Sensor 8 contains excitation windings 9, 10 made in the form of eights (Fig. 2 ), the axes of symmetry of which are mutually perpendicular, and the measuring

winding And, located symmetrically and orthogonally with respect to the excitation windings .; The device works as follows. The excitation windings 9 and 10 of the sensor 8 are powered from generators 1 and 2 by currents of different frequencies. When the surface of the object being monitored is fixed and parallel to the plane of the sensor windings due to the symmetry of the field, there is no signal in the measuring winding 11. With the reciprocating movement of the monitored object, signals are removed from the field windings 9 and 10. These signals come to the input of measurement units 3 and 4, from the output of which information on displacement (on the constant component of the signal), amplitude and frequency of the vibration displacement (on the variable component of the signal) is taken. In this case, the measurement takes place on two channels at different frequencies. Pru;

the tilt of the surface of the object being monitored violates the symmetric field, and signals of different frequencies appear in the measuring winding 11. These signals through the filters 5 and 6, separating the signals induced from the excitation windings 9, 10, are fed to the inputs

a two-coordinate angle meter 7, from which information is obtained about angular displacements in two mutually perpendicular planes, i.e., the roll of the surface of the object under test.

Subject invention

A device for contactless measurement of vibration parameters, comprising an eddy current sensor with measurement and excitation windings electrically connected to different frequency generators, filters and measurement units, characterized in that, in order to simultaneously measure the vibrations, displacements and roll of the object under test, it is equipped with a two-coordinate measuring instrument an angle connected through filters to the output of the measuring winding of the sensor, and a displacement measuring unit electrically connected to the output of one of the excitation windings; the measuring winding is located symmetrically and orthogonally with respect to the excitation windings, made in the form of eights with mutually perpendicular axes of symmetry.