Vibration analyzer with digital readout
First Claim
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1. A system for carrying out the vibrational analysis of apparatus having a dynamic characteristic comprising:
- input means for receiving an a.c. input signal corresponding with said dynamic characteristic;
a voltage-tunable filter of a variety wherein the passband center frequency thereof is selectible as an exponential function of a tuning input voltage applied at a tuning input thereof, said filter receiving said a.c. input and providing a filtered signal at an output;
amplitude readout means coupled with said filter output for providing a visible indication of the instantaneous amplitude of said filtered signal;
manually actuable voltage source means for providing a manually selectable primary tuning input voltage assertable at said filter tuning input;
detector means for comparing the phase of said input signal with the phase of said filtered signal to derive an error signal corresponding with a phase difference therebetween;
integrator means for treating said error signal to provide a tuning correction signal;
summing means coupled with said filter tuning input and said integrator means for summing said tuning correction signal and said primary tuning input voltage; and
manually actuable switch means for selectively effecting the assertion of said tuning correction signal at said summing means such that the magnitude of said error signal is minimized and the magnitude of said filtered signal is maximized.
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Abstract
A system for carrying out vibrational analysis of machinery and the like wherein a voltage controlled filter is combined with a phase-locked feedback loop to detect maximum amplitude within a given frequency band. A simply derived readout of frequency and amplitude is made available with the arrangement and operation over three or more decades of frequency is availed without manual switching and the like.
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Citations
15 Claims
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1. A system for carrying out the vibrational analysis of apparatus having a dynamic characteristic comprising:
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input means for receiving an a.c. input signal corresponding with said dynamic characteristic; a voltage-tunable filter of a variety wherein the passband center frequency thereof is selectible as an exponential function of a tuning input voltage applied at a tuning input thereof, said filter receiving said a.c. input and providing a filtered signal at an output; amplitude readout means coupled with said filter output for providing a visible indication of the instantaneous amplitude of said filtered signal; manually actuable voltage source means for providing a manually selectable primary tuning input voltage assertable at said filter tuning input; detector means for comparing the phase of said input signal with the phase of said filtered signal to derive an error signal corresponding with a phase difference therebetween; integrator means for treating said error signal to provide a tuning correction signal; summing means coupled with said filter tuning input and said integrator means for summing said tuning correction signal and said primary tuning input voltage; and manually actuable switch means for selectively effecting the assertion of said tuning correction signal at said summing means such that the magnitude of said error signal is minimized and the magnitude of said filtered signal is maximized. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification