SU462998A1 - Electron-beam device for contactless measurement of vibration parameters of turbomachine blades - Google Patents

Description

the stroke of which is associated with the blocks 13, 18, 20 and 17, as well as with the indicator 22 of the rotational speed of the rotor.

The switch 15 has four positions, in each of which only vertical and peripheral sensors are connected to the channels of vertical scanning and modulation of beam intensity, depending on which parameter is measured (bending vibration amplitude, torsional vibration amplitude, amplitude vibration velocities or phase shift between oscillations of adjacent blades).

During the rotation of the rotor of the turbomachine, the impulse of the reference 7 and one of the root sensors 1, 2, 4 or 6 ensure the launch of the blocks 13 and 18 operating in the standby mode. A raster is formed on the screen of the cathode-ray tube 14, the number of vertical lines of which is equal to the number of blades of the rotor stage under study.

The pulses from one of the peripheral sensors 2, 3 or 4 enter the brightness modulation channel and, when the blades oscillate, they flash on a raster of a row of solid lines, the length of which is proportional to the amplitude of the oscillations of the blades.

The pulses from sensor 8 enter the rotor speed measurement unit 21. The output voltage of the velocity measurement unit 21 is supplied to the adjustable blocks 13, 18, 17 and

20 and maintains the constant of the scales along the coordinate axes for displaying the cathode ray tube 14 on the screen when the rotational speed of the rotor of the turbo-beam changes.

Subject invention

Electron beam device for contactless measurement of vibration parameters

turbo-blades, consisting of a pulse of pulse sensors, three pulse shapers, sensor switches, blocks of vertical and horizontal scanning, a time delay block and electronic

oscilloscope, characterized in that, in order to increase the measurement accuracy and ensure the stability of scans in a wide range of variation of the rotor speed, the device is equipped with

modulating the brightness, the input of which is connected to the tag pulse shaper, and the output to the oscilloscope modulating electrode of the cathode ray tube, an asterisk mounted on the turbo-shaft shaft, a pulse sensor connected to the speed measuring unit, and the output of the latter connected to the vertical and horizontal scans, a time delay unit, a luminance modulation unit, made adjustable in rotational speed of the rotor, and an indicator of the speed of rotation of the rotor.

..-eleven

Fig 1