Phase lock loop based system and method for decomposing and tracking decomposed frequency components of a signal, with application to vibration compensation system

A vibration compensating system which decomposes an original electric signal of arbitrary frequency content into a user determined plurality of variable center frequency electric signals for separate processing;

• said vibration compensating system comprising a bank of a plurality of combination phase lock loop and associated first band pass filter bank components, the center frequency of a frequency pass band of each of said associated first band pass filters being effected by use of a signal input thereto, and output by, an associated phase lock loop, each of which phase lock loops is set to provide user desired capture and lock-in frequency ranges;
• such that in use each of said combination phase lock loop and associated first band pass filter bank components is provided the original electric signal at inputs thereof from a first vibration sensor, which first vibration sensor monitors vibrating system open-loop vibration, and such that in use a well defined phase lock loop output electric signal is caused to be provided by a phase lock loop and utilized by said associated first band pass filter to set a passband center frequency thereof, and enable utilized band pass filter output therefrom, if said original electric signal presents with a frequency component within the capture and lock-in ranges of said associated phase lock loop and said phase lock loop is locked thereonto;
• each said associated first band pass filter center frequency, once set, being, in use, continuously caused to vary if, and when, the frequency component in said original electric signal which effects a well defined output signal from an associated phase lock loop, which output is input to an associated first band pass filter, and which frequency component of said original signal which said associated first band pass filter is passing, varies within its associated phase lock loop's lock-in range;
• each of which phase lock loop and associated first band pass filter bank components further comprises a associated second band pass filter, which associated second band pass filter in each bank component is simultaneously provided frequency passband center frequency effecting electric signal input thereto, and output by, the same associated phase lock loop which provides center frequency effecting electric single to said associated first band pass filter in said bank component, such that center frequency of said associated second band pass filter is set, and caused to vary in a manner the same as that of said associated first band pass filter;
• which associated second band pass filter is caused to receive an input electric signal from a second vibration sensor, which second vibration sensor monitors closed-loop vibration at a location physically offset from the location at which said open-loop vibration monitoring first vibration sensor is located by an intervening actuator, and which second vibration sensor provides an output electric signal with a frequency component within the frequency pass band of said associated second band pass filter;
• such that in use signals are developed by appropriate magnitude and phase modifications to the signal from said associated first band pass filter in each bank component, which magnitude and phase modifications are based upon the signal exiting said associated second band pass filter in each bank component, with said magnitude and phase adjusted signals from various bank components being summed and provided to said actuator such that it is caused to respond with a physical action response which compensates said vibration sensed by said first vibration sensor such that said second vibration sensor is caused to sense a reduced magnitude vibration.

A method of decomposing an original signal into a user determined plurality of signals, each of which signals is centered about a variable center frequency, comprising the steps of:

• a. obtaining a system for decomposing an original signal of arbitrary frequency content into a user determined plurality of signals, each of which signals is centered about a variable center frequency, said system comprising a bank of a plurality of combination phase lock loop and associated band pass filter bank components, the center frequency of a frequency pass band of each of said band pass filters being effected by use of a signal input thereto, and output by, an associated phase lock loop, each of which phase lock loops is set to provide user desired capture and lock-in frequency ranges;
• such that in use each of said combination phase lock loop and associated band pass filter bank components is provided the original signal at inputs thereof, and such that in use a well defined phase lock loop output signal is caused to be provided by a phase lock loop and utilized by an associated band pass filter to set a passband center frequency thereof, and enable utilized band pass filter output therefrom, if said original signal presents with a frequency component within the capture and lock-in ranges of said associated phase lock loop and said phase lock loop is locked thereonto;
• each said band pass filter center frequency, once set, being, in use, continuously caused to vary if, and when, the frequency component in said original signal which effects a well defined output signal from an associated phase lock loop, which output is input to an associated band pass filter, and which frequency component of said original signal which said associated band pass filter is passing, varies within its associated phase lock loop's lock-in range;
• b. setting the capture and lock-in frequency ranges of each phase lock loop present;
• and
• c. applying an arbitrary frequency content original signal to inputs of the phase lock loops and band pass filters of said system for decomposing an original signal of arbitrary frequency content;
• d. monitoring the output signals from at least some of said plurality of band pass filters.

A method of compensating vibrations in a vibrating system comprising the steps of:

• a. providing a vibration compensating system to said vibrating system, which vibration compensating system decomposes an original electric signal of arbitrary frequency content into a user determined plurality of variable center frequency electric signals for separate processing;
• said vibration compensating system comprising a bank of a plurality of combination phase lock loop and associated first band pass filter bank components, the center frequency of a frequency pass band of each of said associated first band pass filters being effected by use of a signal input thereto, and output by, an associated phase lock loop, each of which phase lock loops is set to provide user desired capture and lock-in frequency ranges;
• such that in use each of said combination phase lock loop and associated first band pass filter bank components is provided the original electric signal at inputs thereof from a first vibration sensor, which first vibration sensor monitors vibrating system Open-loop vibration, and such that in use a well defined phase lock loop output electric signal is caused to be provided by a phase lock loop and utilized by said associated first band pass filter to set a passband center frequency thereof, and enable utilized band pass filter output therefrom, if said original electric signal presents with a frequency component within the capture and lock-in ranges of said associated phase lock loop and said phase lock loop is locked thereonto;
• each said associated first band pass filter center frequency, once set, being, in use, continuously caused to vary if, and when, the frequency component in said original electric signal which effects a well defined output signal from an associated phase lock loop, which output is input to an associated first band pass filter, and which frequency component of said original signal which said associated first band pass filter is passing, varies within its associated phase lock loop's lock-in range;
• each of which phase lock loop and associated first band pass filter bank components further comprises a associated second band pass filter, which associated second band pass filter in each bank component is simultaneously provided frequency passband center frequency effecting electric signal input thereto, and output by, the same associated phase lock loop which provides center frequency effecting electric single to said associated first band pass filter in said bank component, such that a center frequency of said associated second band pass filter is set, and caused to vary in a manner the same as that of said associated first band pass filter;
• which associated second band pass filter is caused to receive an input electric signal from a second vibration sensor in said vibrating system, which second vibration sensor monitors closed-loop vibrations at a location physically offset from the location at which said open-loop vibration monitoring first vibration sensor is located by an intervening actuator, and which second vibration sensor provides an output electric signal of a frequency within the frequency pass band of said associated second band pass filter;
• such that in use signals are developed by appropriate magnitude and phase modifications to the signal from said associated first band pass filter in each bank component, which magnitude and phase modifications are based upon the signal exiting said associated second band pass filter in each bank component, with said magnitude and phase adjusted signals from various bank components being summed and provided to said actuator such that it is caused to respond with a physical action response which compensates said vibration sensed by said first vibration sensor such that said second vibration sensor is caused to sense a reduced magnitude compensated vibration;
• b. setting the capture and lock-in ranges of each present phase lock loop;
• c. causing signals to be input to said phase lock loops and first band pass filters from said first vibration, feed-forward signal open-loop vibration monitoring sensor, and causing signals from said second vibration sensor, which monitors feed-back signal closed-loop vibrations in said vibrating system, to be input to said second band pass filters.