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US3836757A
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Method and apparatus for the computation of dynamic properties
Assignee: GLN Inc
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Filing: 1973-05-22
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Granted: 1974-09-17
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Expires: 1993-05-22
Abstract
Abstract A method and apparatus for computing the dynamic properties of a material or substance. A transducer is used to generate an electrical signal which is representative of an excitation that is dynamically applied to the material, and a second transducer is used to generate an electrical signal which is representative of the response of the material to such excitation. Independent compensation circuits operate on the generated excitation signal and the generated response signal to compensate for any dynamic errors which are introduced into the phase and/or magnitude ratio existing between the signals by the transducing instruments. A pair of generating circuits, whose characteristics are identically and dynamically matched over the frequency range of interest, accept the compensated excitation signal and the compensated response signal, respectively, and operate thereon. The outputs of one of these matched generating circuits is a first generated signal which is closely related to the compensated response signal and a second generated signal which represents the exact time derivative of the first generated signal, i.e., the related response signal. The output of the second matched generating circuit is a third generated signal which is closely related to the compensated excitation signal. These matched generating circuits preserve the gain and phase relationships which exist between the applied excitation and the actual resultant response.
Inventors
- 👤 C Nachtigal
- 👤 B Hillberry
- 👤 R Goodson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:25
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/22; G06G7/32
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
202 words
An apparatus for the computation of the value of a parameter which characterizes a dynamic property of a substance, which comprises means for applying an excitation to the substance, first transducing means for measuring said excitation and for generating a first electrical excitation signal representative of said excitation; second transducing meAns for measuring a response of the substance to said excitation signal and for generating a first electrical response signal representative of said substance response; first generation means coupled to said second transducing means for generating a rate of response electrical signal and a second electrical response signal from said rate of response signal; second generation means coupled to said first transducing means for generating a second excitation signal, said first and second generation means having identical phase and gain characteristics so that the phase and amplitude relationship between said rate of response signal, said second response signal and said second excitation signal is identical to the phase and amplitude relationship between the applied excitation, the response of the substance and the rate of response of the substance; and computation means for computing a value of the parameter using said rate of response, said second response signal and said second excitation signal.
Claim 2
Independent Claim
202 words
An apparatus for the computation of the value of a parameter which characterizes a dynamic property of a substance, which comprises means for applying an excitation to the substance, first transducing means for measuring said excitation and for generating a first electrical excitation signal representative of said excitation; second transducing meAns for measuring a response of the substance to said excitation signal and for generating a first electrical response signal representative of said substance response; first generation means coupled to said second transducing means for generating a rate of response electrical signal and a second electrical response signal from said rate of response signal; second generation means coupled to said first transducing means for generating a second excitation signal, said first and second generation means having identical phase and gain characteristics so that the phase and amplitude relationship between said rate of response signal, said second response signal and said second excitation signal is identical to the phase and amplitude relationship between the applied excitation, the response of the substance and the rate of response of the substance; and computation means for computing a value of the parameter using said rate of response, said second response signal and said second excitation signal.
Claim 3
Dependent Claim
45 words
An apparatus for the computation of the value of a parameter which characterizes a dynamic property of a substance as claimed in claim 1 including means for selectively scaling one of said generated electrical signals and for simultaneously scaling the computed value of the parameter.
Claim 4
Independent Claim
219 words
An apparatus for the computation of the values for parameters which characterize the dynamic properties of a substance when an excitation is applied thereto, which comprises first transducer means for measuring the excitation and generating a first electrical excitation signal representative thereof; second transducer means for measuring a response of the substance to the excitation and for generating a first electrical response signal representative thereof; first compensation means for adjusting said first excitation signal to create a first adjusted excitation signal; second compensation means for adjusting said first response signal to create a first adjusted response signal; first generation means for generating a rate of response signal and a second electrical response signal from said first adjusted response signal, said rate of response signal being an exact time derivative of said second electrical response signal; second generation means for generating a second electrical excitation signal from said first adjusted excitation signal whereby the phase and amplitude relationship between said second electrical response signal and said second electrical excitation signal is identical to the phase and amplitude relationship between said first adjusted response signal and said first adjusted excitation signal; and analog circuit means for using said second excitation signal, said second response signal and said rate signal to compute the parameters which characterize the dynamic properties of the substance.
Claim 5
Independent Claim
219 words
An apparatus for the computation of the values for parameters which characterize the dynamic properties of a substance when an excitation is applied thereto, which comprises first transducer means for measuring the excitation and generating a first electrical excitation signal representative thereof; second transducer means for measuring a response of the substance to the excitation and for generating a first electrical response signal representative thereof; first compensation means for adjusting said first excitation signal to create a first adjusted excitation signal; second compensation means for adjusting said first response signal to create a first adjusted response signal; first generation means for generating a rate of response signal and a second electrical response signal from said first adjusted response signal, said rate of response signal being an exact time derivative of said second electrical response signal; second generation means for generating a second electrical excitation signal from said first adjusted excitation signal whereby the phase and amplitude relationship between said second electrical response signal and said second electrical excitation signal is identical to the phase and amplitude relationship between said first adjusted response signal and said first adjusted excitation signal; and analog circuit means for using said second excitation signal, said second response signal and said rate signal to compute the parameters which characterize the dynamic properties of the substance.
Claim 6
Dependent Claim
68 words
An apparatus for the computation of the values for parameters which characterize the dynamic properties of a substance as claimed in claim 3 wherein said first generation means and said second generation means are exactly matched in gain and phase characteristics whereby signals applied to each of said generation means are changed thereby by exactly the same amount of amplitude and exactly the same amount of phase shift.
Claim 7
Independent Claim
234 words
An apparatus for the computation of the values for parameters which characterize the dynamic properties of a substance when an excitation is applied thereto, which comprises first transducer means for measuring the excitation and generating a first electrical excitation signal representative thereof; second transducer means for measuring the rate of a response of the substance to the excitation and for generating a first electrical rate of response signal representative thereof; first compensation means for adjusting said first excitation signal to create a first adjusted excitation signal; second compensation means for adjusting said first rate of response signal to create a first adjusted rate of response signal; first generation means for generating a response sIgnal and a second rate of response signal from said first adjusted rate of response signal, said response signal being the exact time integral of said second rate of response signal; second generation means for generating a second electrical excitation signal from said first adjusted excitation signal whereby the phase and amplitude relationship between said second electrical rate of response signal and said second electrical excitation signal is identical to the phase and amplitude relationship between said first adjusted rate of response signal and said first adjusted excitation signal; and analog circuit means for using said second excitation signal, said second rate of response signal and said response signal to compute the parameters which characterize the dynamic properties of the substance.
Claim 8
Independent Claim
234 words
An apparatus for the computation of the values for parameters which characterize the dynamic properties of a substance when an excitation is applied thereto, which comprises first transducer means for measuring the excitation and generating a first electrical excitation signal representative thereof; second transducer means for measuring the rate of a response of the substance to the excitation and for generating a first electrical rate of response signal representative thereof; first compensation means for adjusting said first excitation signal to create a first adjusted excitation signal; second compensation means for adjusting said first rate of response signal to create a first adjusted rate of response signal; first generation means for generating a response sIgnal and a second rate of response signal from said first adjusted rate of response signal, said response signal being the exact time integral of said second rate of response signal; second generation means for generating a second electrical excitation signal from said first adjusted excitation signal whereby the phase and amplitude relationship between said second electrical rate of response signal and said second electrical excitation signal is identical to the phase and amplitude relationship between said first adjusted rate of response signal and said first adjusted excitation signal; and analog circuit means for using said second excitation signal, said second rate of response signal and said response signal to compute the parameters which characterize the dynamic properties of the substance.
Claim 9
Dependent Claim
43 words
An apparatus for the computation of the values for parameters which characterize the dynamic properties of a substance as claimed in claim 5, including display means for presenting the computed values of the parameters whereby the computed values are presented in engineering units.
Claim 10
Independent Claim
251 words
An apparatus for the computation of the dynamic spring rate and the damping coefficient of an object, which comprises means for applying a force to the object; first transducer means for measuring said force and for generating an electrical force signal proportional thereto; second transducer means for measuring the deflection of said object resulting from said force and for generating an electrical deflection signal proportional thereto; first phase compensation means for adjusting the phase of said force signal in accordance with the phase of said force; second phase compensation means for adjusting the phase of said deflection signal in accordance with the phase of said deflection whereby the difference in phase between the adjusted force signal and the adjusted deflection signal is identical to the difference in phase between said force and said deflection; first generator means coupled to said phase compensation means for generating a rate of deflection signal and a second deflection signal from said compensated deflection signal, said rate of deflection signal being an exact time derivative of said second deflection signal; second generator means coupled to said first compensation means for generating a second force signal from said compensated force signal; adjustment means coupled to said first and second generator means for exactly matching the overall phase and gain characteristics of said first generator means and said second generator means; and computation means coupled to the outputs of said first and second generator means for computing the dynamic spring rate and the damping coefficient of the object.
Claim 11
Independent Claim
251 words
An apparatus for the computation of the dynamic spring rate and the damping coefficient of an object, which comprises means for applying a force to the object; first transducer means for measuring said force and for generating an electrical force signal proportional thereto; second transducer means for measuring the deflection of said object resulting from said force and for generating an electrical deflection signal proportional thereto; first phase compensation means for adjusting the phase of said force signal in accordance with the phase of said force; second phase compensation means for adjusting the phase of said deflection signal in accordance with the phase of said deflection whereby the difference in phase between the adjusted force signal and the adjusted deflection signal is identical to the difference in phase between said force and said deflection; first generator means coupled to said phase compensation means for generating a rate of deflection signal and a second deflection signal from said compensated deflection signal, said rate of deflection signal being an exact time derivative of said second deflection signal; second generator means coupled to said first compensation means for generating a second force signal from said compensated force signal; adjustment means coupled to said first and second generator means for exactly matching the overall phase and gain characteristics of said first generator means and said second generator means; and computation means coupled to the outputs of said first and second generator means for computing the dynamic spring rate and the damping coefficient of the object.
Claim 12
Dependent Claim
30 words
The apparatus for the computation of the dynamic spring rate and the damping coefficient of an object as claimed in claim 7 wherein said computation means is an analog circuit.
Claim 13
Dependent Claim
55 words
The apparatus for the computation of the dynamic spring rate and the damping coefficient of an object as claimed in claim 7 including a scaling circuit coupled to said first phase compensation means and to said computation means for simultaneously scaling said adjusted force signal, the computed dynamic spring rate and the computed damping coefficient.
Claim 14
Independent Claim
158 words
A method for automatically computing the values for dynamic properties of a substance, which comprises the steps of applying an excitation to the substance; measuring said excitation and generating a first electrical excitation signal proportional thereto; measuring a response of the substance to said excitation and generating a first electrical response signal proportional thereto; adjusting the difference in phase between said first excitation signal and said first response signal to equal the difference in phase between said excitation and said response; generating a rate signal from said response signal; generating a second response signal from said rate signal; generating a second excitation signal from said first excitation signal; Representing the substance with a mathematical model wherein the coefficient of one term in said model represents the value of the dynamic property being computed; and using said mathematical model, said rate signal, said second response signal and said second excitation signal to compute the value of the dynamic property.
Claim 15
Independent Claim
158 words
A method for automatically computing the values for dynamic properties of a substance, which comprises the steps of applying an excitation to the substance; measuring said excitation and generating a first electrical excitation signal proportional thereto; measuring a response of the substance to said excitation and generating a first electrical response signal proportional thereto; adjusting the difference in phase between said first excitation signal and said first response signal to equal the difference in phase between said excitation and said response; generating a rate signal from said response signal; generating a second response signal from said rate signal; generating a second excitation signal from said first excitation signal; Representing the substance with a mathematical model wherein the coefficient of one term in said model represents the value of the dynamic property being computed; and using said mathematical model, said rate signal, said second response signal and said second excitation signal to compute the value of the dynamic property.
Claim 16
Dependent Claim
33 words
The method for automatically computing the value for dynamic properties of a substance as claimed in claim 10 including the step of scaling one of said first excitation and said first response signals.
Claim 17
Dependent Claim
28 words
The method for automatically computing the value for dynamic properties of a substance as claimed in claim 11 including the step of displaying the computed dynamic property value.
Claim 18
Independent Claim
172 words
A method for automatically computing the values for dynamic properties of a substance, which comprises the steps of applying an excitation to the substance; measuring said excitation and generating a first electrical excitation signal proportional thereto; measuring the rate of the response of the substance to said excitation and generating a first electrical rate of response signal proportional thereto; adjusting the difference in phase between said first excitation signal and said first rate of response signal to equal the difference in phase between said excitation and said rate of response; generating a response signal from said rate of response signal; generating a second rate of response signal from said response signal; generating a second excitation signal from said first excitation signal; representing the substance with a mathematical model wherein the coefficient of one term in said model represents the value of the dynamic property being computed using said mathematical model, said second rate of response signal, said response signal and said second excitation signal to compute the value of the dynamic property.
Claim 19
Independent Claim
172 words
A method for automatically computing the values for dynamic properties of a substance, which comprises the steps of applying an excitation to the substance; measuring said excitation and generating a first electrical excitation signal proportional thereto; measuring the rate of the response of the substance to said excitation and generating a first electrical rate of response signal proportional thereto; adjusting the difference in phase between said first excitation signal and said first rate of response signal to equal the difference in phase between said excitation and said rate of response; generating a response signal from said rate of response signal; generating a second rate of response signal from said response signal; generating a second excitation signal from said first excitation signal; representing the substance with a mathematical model wherein the coefficient of one term in said model represents the value of the dynamic property being computed using said mathematical model, said second rate of response signal, said response signal and said second excitation signal to compute the value of the dynamic property.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |