US4908536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vibration suppressing by electrical termination impedance
Assignee: Individual
•
Filing: 1988-01-25
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Granted: 1990-03-13
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Expires: 2008-01-25
Abstract
Abstract The electrical termination impedance of a variable reluctance electro-mechanical transducer is changed automatically in response to the frequency of vibration applied to the transducer, to provide the optimum electrical termination impedance which produces the highest effective mechanical impedance at said frequency. The transducer includes magnetic cores interconnected by a spring formed by cutting a relatively thin medial annulus in a relatively thick flat disk. A digital logic circuit uses a signal counter and NAND gates to determine the frequency and close the appropriate fast-acting relay in a parallel array of capacitor-relays. A negative-impedance electrical termination provides a high mechanical impedance over a broad band of frequencies. A shunting circuit eliminates spurious resonances by providing substantially no shunting in the transducer-terminating circuit at resonant frequency, and substantial shunting in the terminating circuit at other frequencies.
Inventors
- 👤 Albert A. Hudimac
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:06
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/0207; B06B1/0223; G; G01; G01H; G01H11/00; G01H11/02
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
72 words
The method for suppressing vibration comprising applying vibration to an electro-mechanical transducer, sensing the frequency of vibration, selecting a termination impedance capable of providing the transducer with a desired mechanical impedance at said frequency, and automatically connecting circuit means having said termination impedance to the transducer, wherein the transducer converts said vibration into an electrical signal and the sensing comprises counting the axis crossings of said signal over a predetermined time interval.
Claim 2
Independent Claim
72 words
The method for suppressing vibration comprising applying vibration to an electro-mechanical transducer, sensing the frequency of vibration, selecting a termination impedance capable of providing the transducer with a desired mechanical impedance at said frequency, and automatically connecting circuit means having said termination impedance to the transducer, wherein the transducer converts said vibration into an electrical signal and the sensing comprises counting the axis crossings of said signal over a predetermined time interval.
Claim 3
Independent Claim
73 words
The method for suppressing vibration comprising applying vibration to an electro-mechanical transducer, sensing the frequency of vibration, selecting a termination impedance capable of providing the transducer with a desired mechanical impedance at said frequency, and automatically connecting circuit means having said termination impedance to the transducer, further comprising automatically shunting the circuit means at frequencies other than the resonant frequency thereby lowering the effective Q at said other frequencies and eliminating spurious resonance.
Claim 4
Independent Claim
73 words
The method for suppressing vibration comprising applying vibration to an electro-mechanical transducer, sensing the frequency of vibration, selecting a termination impedance capable of providing the transducer with a desired mechanical impedance at said frequency, and automatically connecting circuit means having said termination impedance to the transducer, further comprising automatically shunting the circuit means at frequencies other than the resonant frequency thereby lowering the effective Q at said other frequencies and eliminating spurious resonance.
Claim 5
Independent Claim
60 words
The method for suppressing vibration comprising applying vibration to an electro-mechanical transducer, sensing the frequency of vibration, selecting a termination impedance capable of providing the transducer with a desired mechanical impedance at said frequency, and automatically connecting circuit means having said termination impedance to the transducer, further comprising automatically shunting the circuit means at resonant frequency thereby eliminating spurious resonances.
Claim 6
Independent Claim
60 words
The method for suppressing vibration comprising applying vibration to an electro-mechanical transducer, sensing the frequency of vibration, selecting a termination impedance capable of providing the transducer with a desired mechanical impedance at said frequency, and automatically connecting circuit means having said termination impedance to the transducer, further comprising automatically shunting the circuit means at resonant frequency thereby eliminating spurious resonances.
Claim 7
Dependent Claim
15 words
The method of claim 1 wherein the desired mechanical impedance is a high mechanical impedance.
Claim 8
Dependent Claim
22 words
The method of claim 1 wherein the termination impedance is the optimum impedance which produces the highest mechanical impedance at said frequency.
Claim 9
Dependent Claim
29 words
The method of claim 1 further comprising providing a composite of a vibration suppression system and a feedback system and enhancing the ability of either system to control vibration.
Claim 10
Dependent Claim
37 words
The method of claim 6 wherein the providing comprises providing a simple composite of a dynamic absorber, vibration suppression system and a feedback system and enhancing the capability to control vibration at and near a single frequency.
Claim 11
Dependent Claim
24 words
The method of claim 6 wherein the providing of feedback comprises providing virtual feedback for enhancing the apparent Q of the vibration suppression system.
Claim 12
Dependent Claim
34 words
The method of claim 1 further comprising providing a composite of the vibration suppression system and a feedback system for enhancing capability of controlling vibration caused by a force with a slowly varying frequency.
Claim 13
Dependent Claim
36 words
The method of claim 1 further comprising introducing a negative resistance in the electrical termination of a vibration supression system, thus increasing its Q for enhancing the capability of a vibration suppression system to control vibration.
Claim 14
Independent Claim
77 words
The method of suppressing vibrations in a foundation, comprising: mounting a pair of identical vibrations suppressor transducers on a foundation in an opposite sense, concurrently controlling the transducers; providing two oppositely push-pull vibration suppression systems, thereby significantly reducing non-linear distortion; providing a center-tapped autotransformer to provide dc flux bias current the two push-pull vibration suppression systems and nearly cancelling the dc flux bias in the autotransformer, thus providing higher ac impedance shunting the two vibration suppression systems.
Claim 15
Independent Claim
77 words
The method of suppressing vibrations in a foundation, comprising: mounting a pair of identical vibrations suppressor transducers on a foundation in an opposite sense, concurrently controlling the transducers; providing two oppositely push-pull vibration suppression systems, thereby significantly reducing non-linear distortion; providing a center-tapped autotransformer to provide dc flux bias current the two push-pull vibration suppression systems and nearly cancelling the dc flux bias in the autotransformer, thus providing higher ac impedance shunting the two vibration suppression systems.
Claim 16
Independent Claim
25 words
The method of caim 11 wherein the mounting comprises putting identical vibration suppression systems back-to-back on the same side of the foundation in tandem arrangement.
Claim 17
Independent Claim
25 words
The method of caim 11 wherein the mounting comprises putting identical vibration suppression systems back-to-back on the same side of the foundation in tandem arrangement.
Claim 18
Dependent Claim
54 words
The method of claim 11 further comprising providing a two-coil transformer, with one coil center-tapped and connected as in claim 11, and with the secondary coil connected to a load, and used simultaneously for providing a high ac impedance dc bias source, and proper electrical terminations to a pair of push-pull vibration suppression systems.
Claim 19
Dependent Claim
48 words
The method of claim 11 wherein the mounting comprises mounting identical vibration suppressors back-to-back in tandem arrangement on the same side of the foundation and joining backing masses together and mounting the backing masses on a single set of springs while minimizing coupling between two sets of cores.
Claim 20
Dependent Claim
43 words
The method of claim 1 wherein a running average of the number of axis crossings is made in a series of subintervals by adding the count from a new subinterval and dropping the count from the oldest subinterval, doing this once each subinterval.
Claim 21
Dependent Claim
50 words
The method of claim 1 wherein the termination means is specified by the digital output of the counter crossings, said output is used to extract from a memory a digital output, said memory output connects a number of capacitors from a digital set, and connects them across the transducer output.
Claim 22
Dependent Claim
47 words
The method of claim 11, wherein the mounting comprises mounting identical vibration suppressors back-to-back in tandem arrangement on the same side of the foundation and joining backing masses together and mounting the backing masses on a single set of springs while minimizing coupling between the back-to-back suppressors.
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) | 1993-03-12 | 1993-09-11 | 1994-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-12 | 1997-09-11 | 1998-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-12 | 2001-09-11 | 2002-03-13 | $7700.00 | Window Closed / Lapsed |