Apparatus for measuring amplitude of vibration of rotating machine parts

Claim 1

An apparatus for measuring the amplitude of vibration of rotating parts of machines having a stator and a shaft with marks, mounting rotating parts, comprising: a first pulse sensor sensing a first mark of said shaft of said machine, said sensor being mounted on the stator of said machine; a second pulse sensor for sensing second marks of said shaft of said machine, disposed in the same plane with said rotating parts of said machine when the latter do not vibrate, the number of said second marks corresponding to the number of said rotating parts; said second pulse sensor being mounted on said stator of said machine opposite to said second marks; a third pulse sensor for sensing said rotating parts of said machine, mounted on said stator of said machine opposite to said rotating parts; a first pulse former for appropriately shaping pulses from a sensor, having its input connected to the output of said first pulse sensor; a second pulse former for appropriately shaping pulses from a sensor, having its input connected to the output of said second pulse sensor; a third pulse sensor for appropriately shaping pulses from a sensor, having its input connected to the output of said third pulse sensor; a horizontal scanning unit comprising a sawtooth generator with controlled sawtooth rise-time and having a first input connected to the output of said first pulse former, and a second input for feeding signals controlling the rise-time of sawtooth signal generated therein; a pulse delay unit at the output of said second pulse former, comprising a sawtooth generator with controlled sawtooth rise-time, having a first input connected to the output of said second pulse former, and a second input for feeding signals controlling the rise-time of a sawtooth signal generated therein; a vertical scanning unit comprising a sawtooth generator with controlled sawtooth risetime, having a first input connected to the output of said pulse delay unit, and a second input for feeding signals controlling the rise-time of a sawtooth signal generated therein; a cathoderay tube; horizontal-deflection plates of said cathode-ray tube connected to the output of said horizontal scanning unit; vertical-deflection plates of said cathode-ray tube connected to the output of said vertical scanning unit; a control electrode of said cathode-ray tube electrically coupled to the output of said third pulse former; a converter for converting pulse frequency into a signal proportional thereto, having its input connected to the output of said first pulse former and an output connected to said second input of said horizontal scanning unit, to said second input of said pulse delay unit and to said second input of said vertical scanning unit; a screen of said cathode-ray tube on which a scan pattern is displayed during the operation of the apparatus, the scan pattern consisting of vertical lines whose number corresponds to the number of said rotating parts, each line displaying a spot which is defined by the instant of passage of a respective one of said rotating parts by said third pulse sensor, said spot displaying a displacement line, the length of the displacement line being proportional to the amplitude of vibration of said rotating part.

Claim 2

An apparatus for measuring the amplitude of vibration of rotating parts of machines having a stator and a shaft with marks, mounting rotating parts, comprising: a first pulse sensor sensing a first mark of said shaft of said machine, said sensor being mounted on the stator of said machine; a second pulse sensor for sensing second marks of said shaft of said machine, disposed in the same plane with said rotating parts of said machine when the latter do not vibrate, the number of said second marks corresponding to the number of said rotating parts; said second pulse sensor being mounted on said stator of said machine opposite to said second marks; a third pulse sensor for sensing said rotating parts of said machine, mounted on said stator of said machine opposite to said rotating parts; a first pulse former for appropriately shaping pulses from a sensor, having its input connected to the output of said first pulse sensor; a second pulse former for appropriately shaping pulses from a sensor, having its input connected to the output of said second pulse sensor; a third pulse sensor for appropriately shaping pulses from a sensor, having its input connected to the output of said third pulse sensor; a horizontal scanning unit comprising a sawtooth generator with controlled sawtooth rise-time and having a first input connected to the output of said first pulse former, and a second input for feeding signals controlling the rise-time of sawtooth signal generated therein; a pulse delay unit at the output of said second pulse former, comprising a sawtooth generator with controlled sawtooth rise-time, having a first input connected to the output of said second pulse former, and a second input for feeding signals controlling the rise-time of a sawtooth signal generated therein; a vertical scanning unit comprising a sawtooth generator with controlled sawtooth risetime, having a first input connected to the output of said pulse delay unit, and a second input for feeding signals controlling the rise-time of a sawtooth signal generated therein; a cathoderay tube; horizontal-deflection plates of said cathode-ray tube connected to the output of said horizontal scanning unit; vertical-deflection plates of said cathode-ray tube connected to the output of said vertical scanning unit; a control electrode of said cathode-ray tube electrically coupled to the output of said third pulse former; a converter for converting pulse frequency into a signal proportional thereto, having its input connected to the output of said first pulse former and an output connected to said second input of said horizontal scanning unit, to said second input of said pulse delay unit and to said second input of said vertical scanning unit; a screen of said cathode-ray tube on which a scan pattern is displayed during the operation of the apparatus, the scan pattern consisting of vertical lines whose number corresponds to the number of said rotating parts, each line displaying a spot which is defined by the instant of passage of a respective one of said rotating parts by said third pulse sensor, said spot displaying a displacement line, the length of the displacement line being proportional to the amplitude of vibration of said rotating part.