US3848115A
Expired / Lapsed
US
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Vibration control system
Assignee: TIME DATE CORP
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Filing: 1973-10-19
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Granted: 1974-11-12
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Expires: 1993-10-19
Abstract
Abstract A vibration control system which compares the actual spectral density of a specimen with a predetermined spectral density and modifies a random signal based on the results of the comparison to generate a driving signal is disclosed. A single frame of the driving signal is randomized to permit the single frame of information to be used a number of times for controlling the system. A technique referred to as ''''windowing'''' is also utilized on successive frames of information.
Inventors
- 👤 E Sloane
- 👤 C Heizman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:36
CPC Classifications
G; G01; G01M; G01M7/00; G01M7/02; G01M7/022
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
158 words
A vibration control system for generating a control signal comprising: sensing means for sensing the movement of a specimen; a first converting means for converting at least one frame of information from said sensing means to the frequency domain; comparator means for comparing said converted frame of information with a predetermined spectrum and for providing a comparison frame of data representative of said comparison, coupled to said first converting means; a generator for generating a random signal; combining means for combining said random signal with said frame of data coupled to said generator and said comparator means; a second converting means for converting the output of said combining means to the time domain and for providing a control frame of information, coupled to said combining means; and randomization means coupled to said second converting means for randomizing said control frame such that said control frame may be repeatedly used as said control signal for said vibration control signal.
Claim 2
Dependent Claim
158 words
A vibration control system for generating a control signal comprising: sensing means for sensing the movement of a specimen; a first converting means for converting at least one frame of information from said sensing means to the frequency domain; comparator means for comparing said converted frame of information with a predetermined spectrum and for providing a comparison frame of data representative of said comparison, coupled to said first converting means; a generator for generating a random signal; combining means for combining said random signal with said frame of data coupled to said generator and said comparator means; a second converting means for converting the output of said combining means to the time domain and for providing a control frame of information, coupled to said combining means; and randomization means coupled to said second converting means for randomizing said control frame such that said control frame may be repeatedly used as said control signal for said vibration control signal.
Claim 3
Dependent Claim
32 words
The system defined in claim 1 wherein said control frame comprises a plurality of digital signals and said randomization means randomly arranges said digital signals to provide a plurality of control frames.
Claim 4
Dependent Claim
17 words
The system defined in claim 2 wherein said first and second converter means are a common means.
Claim 5
Dependent Claim
15 words
The system defined in claim 3 wherein Fourier transforms are utilized by said converter means.
Claim 6
Dependent Claim
92 words
A digital system for generating a plurality of control frames of digital data for controlling a vibration system where said plurality of control frames are bases on a first frame of digital data comprising: computer means for generating said first frame of digital data as a function of a comparison between a measured spectrum and a predetermined spectrum; and, randomizing means for randomly arranging said first frame of digital data into said plurality of control frames; whereby said control frames may be converted to an analog signal for controlling said vibration system.
Claim 7
Dependent Claim
92 words
A digital system for generating a plurality of control frames of digital data for controlling a vibration system where said plurality of control frames are bases on a first frame of digital data comprising: computer means for generating said first frame of digital data as a function of a comparison between a measured spectrum and a predetermined spectrum; and, randomizing means for randomly arranging said first frame of digital data into said plurality of control frames; whereby said control frames may be converted to an analog signal for controlling said vibration system.
Claim 8
Dependent Claim
105 words
A vibration control system comprising: sensing means for sensing the movement of a specimen; a generator for generating a random signal; computer means for converting a predetermined duration of said sensed movement to the frequency domain, for comparing said converted predetermined duration of sensed movement with a reference spectrum, for multiplying the results of said comparison with said random signal and for reconverting the results of said multiplication to a time domain function to provide a control signal of finite duration; and randomizing means for successively randomizing said control signal of finite duration to provide a continuous control signal for controlling said vibration control system.
Claim 9
Dependent Claim
105 words
A vibration control system comprising: sensing means for sensing the movement of a specimen; a generator for generating a random signal; computer means for converting a predetermined duration of said sensed movement to the frequency domain, for comparing said converted predetermined duration of sensed movement with a reference spectrum, for multiplying the results of said comparison with said random signal and for reconverting the results of said multiplication to a time domain function to provide a control signal of finite duration; and randomizing means for successively randomizing said control signal of finite duration to provide a continuous control signal for controlling said vibration control system.
Claim 10
Dependent Claim
119 words
In a vibration control system which generates a digital control signal comprising a plurality of digital words based on a reference spectrum and a measured spectrum, an improvement for utilizing a predetermined segment of said digital control signal for providing a continuous control signal comprising: a memory for storing said segment of said digital control signal; random generator means; and control means coupled to said memory and said random generator means for causing said digital control signal to be randomized such that said signal is read from said memory with a different one of said words being first, said different one of said words being selected by said random generator means; whereby a continuous control signal may be generated.
Claim 11
Dependent Claim
119 words
In a vibration control system which generates a digital control signal comprising a plurality of digital words based on a reference spectrum and a measured spectrum, an improvement for utilizing a predetermined segment of said digital control signal for providing a continuous control signal comprising: a memory for storing said segment of said digital control signal; random generator means; and control means coupled to said memory and said random generator means for causing said digital control signal to be randomized such that said signal is read from said memory with a different one of said words being first, said different one of said words being selected by said random generator means; whereby a continuous control signal may be generated.
Claim 12
Dependent Claim
28 words
The vibration control system defined in claim 7 wherein the contents of said memory are periodically updated with another digital control signal comprising a plurality of digital words.
Claim 13
Dependent Claim
127 words
In a vibrAtion control system which compares the actual spectrum of a specimen being subjected to vibrations with a reference spectrum and modifies a random signal based on the comparison to generate a control signal, an improvement for allowing a predetermined duration of said control signal to be utilized for a period of time greater than the time represented by said predetermined duration for controlling a vibration system comprising: a recirculating memory for storing said predetermined duration of said control signal and for recirculating said signal within said memory; and random generation means for causing said control signal to be read from said memory such that said control signal is randomized; whereby said control signal of predetermined duration may be used as a continuous random driving signal.
Claim 14
Dependent Claim
127 words
In a vibrAtion control system which compares the actual spectrum of a specimen being subjected to vibrations with a reference spectrum and modifies a random signal based on the comparison to generate a control signal, an improvement for allowing a predetermined duration of said control signal to be utilized for a period of time greater than the time represented by said predetermined duration for controlling a vibration system comprising: a recirculating memory for storing said predetermined duration of said control signal and for recirculating said signal within said memory; and random generation means for causing said control signal to be read from said memory such that said control signal is randomized; whereby said control signal of predetermined duration may be used as a continuous random driving signal.
Claim 15
Independent Claim
108 words
A method for controlling the movement of a vibration producing apparatus with a random signal to produce vibrations having a predetermined power spectral density comprising: comparing the power spectral density representation of the movement of the apparatus with the predetermined power spectral density and generating a digital signal representative of said comparison; generating a random signal; converting the results of said comparison and said random signal into a time domain random driving signal of predetermined duration by utilizing an inverse Fourier transform; randomizing said driving signal of predetermined duration into a continuous random driving signal; and controlling the movement of the apparatus with said continuous random driving signal.
Claim 16
Independent Claim
108 words
A method for controlling the movement of a vibration producing apparatus with a random signal to produce vibrations having a predetermined power spectral density comprising: comparing the power spectral density representation of the movement of the apparatus with the predetermined power spectral density and generating a digital signal representative of said comparison; generating a random signal; converting the results of said comparison and said random signal into a time domain random driving signal of predetermined duration by utilizing an inverse Fourier transform; randomizing said driving signal of predetermined duration into a continuous random driving signal; and controlling the movement of the apparatus with said continuous random driving signal.
Claim 17
Independent Claim
129 words
A method for controlling the movement of a vibration producing apparatus to produce vibrations having predetermined frequency contents comprising the following steps: sensing the movement of said apparatus and producing a digital signal representative of the sensed movement; converting a predetermined duration of the digital signal to a frequency domain representation; comparing the converted digital signal to the predetermined frequency contents and producing an output signal representative of said comparison; generating a random signal; combining said random signal with said output signal representative of said comparison; converting said combined signal into a time domain driving signal; randomizing said time domain driving signal to form a continuous driving signal; converting said continuous driving signal into an analog driving signal; and driving the vibration producing apparatus with said analog driving signal.
Claim 18
Independent Claim
129 words
A method for controlling the movement of a vibration producing apparatus to produce vibrations having predetermined frequency contents comprising the following steps: sensing the movement of said apparatus and producing a digital signal representative of the sensed movement; converting a predetermined duration of the digital signal to a frequency domain representation; comparing the converted digital signal to the predetermined frequency contents and producing an output signal representative of said comparison; generating a random signal; combining said random signal with said output signal representative of said comparison; converting said combined signal into a time domain driving signal; randomizing said time domain driving signal to form a continuous driving signal; converting said continuous driving signal into an analog driving signal; and driving the vibration producing apparatus with said analog driving signal.
Claim 19
Dependent Claim
32 words
The method defined in claim 11 wherein said converting of said predetermined duration of the digital signal occurs periodically so as to allow a different time domain driving signal to be randomized.
Claim 20
Dependent Claim
17 words
The method defined in claim 12 wherein the frequency domain representation comprises a power spectral density representation.
Claim 21
Dependent Claim
47 words
The method defined in claim 13 wherein said random signal comprises the sine and cosine of a random digital signal representative of an angle and said combining means comprises means for multiplying said sine and cosine of said angle by said output signal representative of said comparison.
Claim 22
Dependent Claim
120 words
A digital system for generating a plurality of control frames of digital data for controlling a vibration system where said plurality of control frames are based on a first frame of digital data comprising: computer means for generating said first frame of digital data as a function of a comparison between a measured spectrum and a predetermined spectrum; and windowing means for multiplying at least the beginning and end of said first frame of digital data by some predetermined function and for adding a plurality of said frames such that at least one end of one frame overlaps said beginning of a subsequent frame; whereby said conrol frames may be converted to an analog signal for controlling said vibration system.
Claim 23
Dependent Claim
120 words
A digital system for generating a plurality of control frames of digital data for controlling a vibration system where said plurality of control frames are based on a first frame of digital data comprising: computer means for generating said first frame of digital data as a function of a comparison between a measured spectrum and a predetermined spectrum; and windowing means for multiplying at least the beginning and end of said first frame of digital data by some predetermined function and for adding a plurality of said frames such that at least one end of one frame overlaps said beginning of a subsequent frame; whereby said conrol frames may be converted to an analog signal for controlling said vibration system.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |