Patent US3751994A successfully refreshed from Google Patents.
US3751994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oscillatory signal system with turn on and turn off rate control
Assignee: MTS Systems Corp
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Filing: 1971-01-18
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Granted: 1973-08-14
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Expires: 1991-01-18
Abstract
Abstract A full scale oscillatory signal is multiplied by a ramp-type amplitude controlled rate signal to provide an output signal increasing linearly from zero volts to a full scale peak-to-peak value and then decreasing linearly back to zero. The rise portion of the ramp signal provides a controlled turn on rate for an oscillatory program command for material testing apparatus to avoid destruction of the specimen being tested, and the fall portion of the ramp signal provides a controlled turn off rate. Multi-channel test systems can be similarly controlled, only a single potentiometer being required for controlling the amplitude of all channels simultaneously.
Inventors
- 👤 A Gross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:06
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/94; G; G01; G01M; G01M7/00; G01M7/02; G01M7/022; G05; G05F; G05F1/00; G05F1/10; G05F1/12
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
132 words
A system for controlling the turn on rate of an oscillatory signal for a test apparatus including a reciprocating actuator connected to a specimen, comprising means for supplying an oscillatory signal to said actuator, the turn on rate of which is to be controlled to prevent damaging the specimen, means providing a ramp signal having a slope portion, and means for multiplying said signals together to provide an oscillatory output signal increasing in peak-to-peak amplitude in accordance with the rate of rise of said slope portion during a desired turn on time, means providing a steady state reference signal to said multiplying means when the ramp signal reaches a preselected value, and switch means to connect the multiplying means to the last mentioned means when the ramp portion reaches said preselected value.
Claim 2
Independent Claim
132 words
A system for controlling the turn on rate of an oscillatory signal for a test apparatus including a reciprocating actuator connected to a specimen, comprising means for supplying an oscillatory signal to said actuator, the turn on rate of which is to be controlled to prevent damaging the specimen, means providing a ramp signal having a slope portion, and means for multiplying said signals together to provide an oscillatory output signal increasing in peak-to-peak amplitude in accordance with the rate of rise of said slope portion during a desired turn on time, means providing a steady state reference signal to said multiplying means when the ramp signal reaches a preselected value, and switch means to connect the multiplying means to the last mentioned means when the ramp portion reaches said preselected value.
Claim 3
Dependent Claim
68 words
The system as defined in claim 1 in which said ramp signal means also provides a second slope portion for controlling the turn off rate of said output signal, and means to disconnect the reference signal means from the multiplier and to connect said second slope portion of ramp signal means to said multiplying means when said means providing the reference signal is disconnected from said multiplying means.
Claim 4
Dependent Claim
18 words
The system as defined in claim 2 in which said first slope portion increases at a linear rate.
Claim 5
Dependent Claim
24 words
The system as defined in claim 3 in which said second slope portion decreases at a linear rate different rom said first slope portion.
Claim 6
Dependent Claim
17 words
The system as defined in claim 4 including means fOr adjusting the magnitude of said reference signal.
Claim 7
Dependent Claim
28 words
The system as defined in claim 5 including vibration testing apparatus connected to the output of said multiplying means so that said oscillatory output signal controls said apparatus.
Claim 8
Independent Claim
188 words
A system for controlling the turn on rate of an oscillatory signal comprising means for supplying an oscillatory signal, the turn on rate of which is to be controlled, a multiplier having first and second inputs and an output, said signal supplying means being connected to said first input, first switch means connected to said second input for applying a zero potential signal thereto so that the product signal at said output is zero when said switch means is closed, an integrator for providing a positive slope signal during a given interval of time, second switch means connected between the output of said integrator and said second input, means for applying a signal to said integrator to cause said integrator to supply said positive slope signal, said last-mentioned means opening said first switch means and closing said second switch means to apply said positive slope signal through said second switch means to said second input, and means for opening said second switch means when said positive slope signal reaches a predetermined magnitude and then applying a signal of said predetermined magnitude to the second input of said multiplier.
Claim 9
Independent Claim
188 words
A system for controlling the turn on rate of an oscillatory signal comprising means for supplying an oscillatory signal, the turn on rate of which is to be controlled, a multiplier having first and second inputs and an output, said signal supplying means being connected to said first input, first switch means connected to said second input for applying a zero potential signal thereto so that the product signal at said output is zero when said switch means is closed, an integrator for providing a positive slope signal during a given interval of time, second switch means connected between the output of said integrator and said second input, means for applying a signal to said integrator to cause said integrator to supply said positive slope signal, said last-mentioned means opening said first switch means and closing said second switch means to apply said positive slope signal through said second switch means to said second input, and means for opening said second switch means when said positive slope signal reaches a predetermined magnitude and then applying a signal of said predetermined magnitude to the second input of said multiplier.
Claim 10
Dependent Claim
18 words
The system as defined in claim 7 including a constant potential source for applying said predetermined magnitude signal.
Claim 11
Dependent Claim
14 words
The system as defined in claim 8 in which said source is a potentiometer.
Claim 12
Dependent Claim
56 words
The system as defined in claim 9 including vibration testing apparatus connected to the output of said multiplier so that said product signal is supplied to said testing apparatus during the interval when said positive slope signal is increasing and also during the succeeding interval when said constant potential signal is applied to said second input.
Claim 13
Dependent Claim
63 words
The system as defined in claim 7 in which said last-mentioned means includes a third switch means and a potentiometer for supplying a constant potential signal through said third switch means to said second input when said third switch means is closed, said last-mentioned means further including means for closing said third switch means when said positive slope signal reaches said predetermined magnitude.
Claim 14
Dependent Claim
29 words
The system as defined in claim 11 including vibration testing apparatus connected to the output of said multiplier so that said product signal is supplied to said testing apparatus.
Claim 15
Dependent Claim
48 words
The system as defined in claim 12 including means for causing said integrator to provide a negative slope signal, and means for causing said second switch means to close and said third switch means to open so that said negative slope signal is applied to said second input.
Claim 16
Dependent Claim
32 words
The system as defined in claim 13 including means for reclosing said first switch means and reopening said second switch means to again apply said zero potential signal to said second input.
Claim 17
Dependent Claim
91 words
The system as defined in claim 14 in which said vibration apparatus includes a pair of channels, one channel being supplied by the oscillatory output signal from the output of said first multiplier, a second multiplier having first and second inputs and an output, means for connecting said oscillatory signal supplying means to the first input of said second multiplier, means for connecting said first switch means to the second output of said second multiplier, the other of said pair of channels being connected to the output of said second multiplier.
Claim 18
Dependent Claim
53 words
The system as defined in claim 15 including additional means for supplying a second oscillatory signal, a first switch for connecting said additional means to the first input of said second multiplier, said means for connecting said oscillatory signal supplying means to the first input of said second multiplier including a second switch.
Claim 19
Dependent Claim
26 words
The system as defined in claim 16 including a third switch between said first oscillatory signal supplying means and the first input of said first multiplier.
Claim 20
Independent Claim
121 words
A system for controlling the turn on rate of an oscillatory signal comprising a function generator for supplying an oscillatory signal, a multiplier having first and second inputs and an output, said first input being connected to said function generator, an integrator having an input and an output, means for connecting the input of said integrator to a voltage having one polarity, means for connecting the output of said integrator to the second input of said multiplier during one time period, means for disconnecting the output of said integrator from the second input of said multiplier during a second time period, and means for connecting a steady state signal to the second input of said multiplier during said second time period.
Claim 21
Independent Claim
121 words
A system for controlling the turn on rate of an oscillatory signal comprising a function generator for supplying an oscillatory signal, a multiplier having first and second inputs and an output, said first input being connected to said function generator, an integrator having an input and an output, means for connecting the input of said integrator to a voltage having one polarity, means for connecting the output of said integrator to the second input of said multiplier during one time period, means for disconnecting the output of said integrator from the second input of said multiplier during a second time period, and means for connecting a steady state signal to the second input of said multiplier during said second time period.
Claim 22
Dependent Claim
85 words
The system as defined in claim 18 including means for reconnecting the output of said integrator to the second input of said multiplier during a third time period, means for reversing the polarity of said voltage applied to the input of said integrator during said third time period, and means for disconnecting said steady state signal from the second input of said multiplier during said third time period, whereby the turn off rate of said oscillatory signal supplied by said function generator is also controlled.
Claim 23
Dependent Claim
73 words
The system as defined in claim 19 including vibration testing apparatus connected to the output of said multiplier so that the oscillatory signal from said function generator, which is supplied to said vibration testing apparatus from the output of said multiplier, is applied to said vibration apparatus at an increasing peak-to-peak rate during said first time period and removed from said vibration apparatus at a decreasing peak-to-peak rate during said third time period.
Claim 24
Independent Claim
177 words
A system for controlling the turn on and turn off rate of an oscillatory signal used for testing including a reciprocating testing apparatus, said testing apparatus including a plurality of channels, first means for supplying a first oscillatory signal, second means for supplying a second oscillatory signal, means providing a ramp signal having a first slope portion having a rate of magnitude increase, a second slope portion having a rate of magnitude decrease and an intermediate portion of substantially constant magnitude, first multiplying means for multiplying said first oscillatory signal and said ramp signal together to give a first output signal which has a peak to peak amplitude that varies as a function of said ramp signal, second multiplying means for multiplying said second oscillatory signal and said ramp signal together to deliver a second output signal which has a peak to peak amplitude that varies as a function of said ramp signal, and means connecting said first output signal to a first of said channels and said second output signal to a second of said channels.
Claim 25
Independent Claim
177 words
A system for controlling the turn on and turn off rate of an oscillatory signal used for testing including a reciprocating testing apparatus, said testing apparatus including a plurality of channels, first means for supplying a first oscillatory signal, second means for supplying a second oscillatory signal, means providing a ramp signal having a first slope portion having a rate of magnitude increase, a second slope portion having a rate of magnitude decrease and an intermediate portion of substantially constant magnitude, first multiplying means for multiplying said first oscillatory signal and said ramp signal together to give a first output signal which has a peak to peak amplitude that varies as a function of said ramp signal, second multiplying means for multiplying said second oscillatory signal and said ramp signal together to deliver a second output signal which has a peak to peak amplitude that varies as a function of said ramp signal, and means connecting said first output signal to a first of said channels and said second output signal to a second of said channels.
Claim 26
Dependent Claim
64 words
The system as defined in claim 21 including means for connecting said first oscillatory signal supplying means to said second multiplying means in addition to being connected to said first multiplying means, and means for disconnecting said second oscillatory signal supplying means from said second multiplying means so that said first oscillatory signal supplying means supplies the same oscillatory signal to both multiplying means.
Claim 27
Dependent Claim
179 words
A command signal system for controlling the rate of increase of a first oscillatory command signal when said first command signal is initially supplied to a controlled device including a reciprocating actuator connected to a specimen comprising means for supplying a first oscillatory command signal to the actuator, means providing a second ramp command signal independent of the controlled device and having a ramp portion increasing at a selected ramp rate from a first level during a desired turn on time for said actuator, means for combining said signals and delivering a command output signal which has a rate of increase during said turn on time wHich is a function of the second ramp command signal, and means to provide a reference signal, switch means to disconnect the second ramp signal from the combining means and to connect the reference signal to the combining means when the ramp signal reaches a preselected level so that subsequent to the turn on time the command output signal varies as a function of the first command output signal and the reference signal.
Claim 28
Dependent Claim
179 words
A command signal system for controlling the rate of increase of a first oscillatory command signal when said first command signal is initially supplied to a controlled device including a reciprocating actuator connected to a specimen comprising means for supplying a first oscillatory command signal to the actuator, means providing a second ramp command signal independent of the controlled device and having a ramp portion increasing at a selected ramp rate from a first level during a desired turn on time for said actuator, means for combining said signals and delivering a command output signal which has a rate of increase during said turn on time wHich is a function of the second ramp command signal, and means to provide a reference signal, switch means to disconnect the second ramp signal from the combining means and to connect the reference signal to the combining means when the ramp signal reaches a preselected level so that subsequent to the turn on time the command output signal varies as a function of the first command output signal and the reference signal.
Claim 29
Dependent Claim
52 words
The combination of claim 23 and control means for disabling said command output signal, said means providing said second ramp command signal including means providing a decreasing rate ramp signal portion decreasing from the reference level to said first level when the control means for disabling said command output signal is actuated.
Claim 30
Independent Claim
676 words
A system for controlling the turn on and turn off rate of a signal controlling a loading apparatus comprising a multiplier having first and second inputs and an output, a function generator for applying a relatively constant peak-to-peak oscillatory signal to the first input of said multiplier, and an amplitude controlled rate circuit independent of the load applied by the loading apparatus for applying a ramp-type signal to the second input of said multiplier, said amplitude controlled rate circuit including a direct current integrator having first and second inputs and an output, said integrator inverting the polarity of an input signal so that the output signal is of opposite polarity and the second input thereof being connected to a zero reference potential, means for first applying a positive potential to the first input of said integrator, means clamping the output of said integrator to a negative potential while said positive potential is applied to the first input of said integrator, a zero crossing comparator having first and second inputs and an output, said zero crossing comparator inverting the polarity of an input signal so that the output signal is of opposite polarity and said clamping means also applying said negative potential to the first input of said zero crossing comparator and said second input of said zero crossing comparator being connected to said zero reference potential, a first field effect transistor having its gate connected to the output of said zero crossing comparator, its drain connected to said zero reference potential and its supply to the second input of said multiplier so that a positive potential is initially applied to the gate of said field effect transistor to turn on said field effect transistor and thereby apply said zero reference potential to the second input of said multiplier with the consequence that the product signal supplied at the output of said multiplier is zero, means for reversing the polarity applied to the first input of said integrator to a negative potential to provide a positive ramp potential to the output of said integrator to cause the signal at the output thereof to change to a negative potential to switch out said first field effect transistor, a second field effect transistor having its drain connected to the output of said integrator and its supply connected to the second input of said multiplier, means responsive to the means for applying a negative potential to the first input of said integrator to apply a positive potential to the gate of said second field effect transistor to turn on said second field effect transistor and thereby apply said positive ramp potential from said integrator to the second input of said multiplier, an amplitude comparator having first and second inputs and an output, said amplitude comparator inverting the polarity of an input signal so that the output signal is of opposite polarity, means providing a constant positive potential, the first input of said amplitude comparator being connected to said constant positive potential and the second input thereof being connected to the output of said integrator, a third field effect transistor having its gate connected to the output of said amplitude comparator, its dRain to said constant positive potential means and its supply to the second input of said multiplier so that the positive ramp potential from said integrator is applied to the second input of said amplitude comparator to provide a positive signal from the output of said amplitude comparator to the gate of said third field effect transistor to thus turn on said third field effect transistor and thereby apply said constant positive potential from said constant positive potential means to the second input of said multiplier, means connected to the output of said amplitude comparator for turning off said second field effect transistor, means for again applying said positive potential to the first input of said integrator to cause said integrator to ramp with a negative slope, and means responsive to said last-mentioned means for turning off said third field effect transistor and turning said second field effect transistor.
Claim 31
Independent Claim
676 words
A system for controlling the turn on and turn off rate of a signal controlling a loading apparatus comprising a multiplier having first and second inputs and an output, a function generator for applying a relatively constant peak-to-peak oscillatory signal to the first input of said multiplier, and an amplitude controlled rate circuit independent of the load applied by the loading apparatus for applying a ramp-type signal to the second input of said multiplier, said amplitude controlled rate circuit including a direct current integrator having first and second inputs and an output, said integrator inverting the polarity of an input signal so that the output signal is of opposite polarity and the second input thereof being connected to a zero reference potential, means for first applying a positive potential to the first input of said integrator, means clamping the output of said integrator to a negative potential while said positive potential is applied to the first input of said integrator, a zero crossing comparator having first and second inputs and an output, said zero crossing comparator inverting the polarity of an input signal so that the output signal is of opposite polarity and said clamping means also applying said negative potential to the first input of said zero crossing comparator and said second input of said zero crossing comparator being connected to said zero reference potential, a first field effect transistor having its gate connected to the output of said zero crossing comparator, its drain connected to said zero reference potential and its supply to the second input of said multiplier so that a positive potential is initially applied to the gate of said field effect transistor to turn on said field effect transistor and thereby apply said zero reference potential to the second input of said multiplier with the consequence that the product signal supplied at the output of said multiplier is zero, means for reversing the polarity applied to the first input of said integrator to a negative potential to provide a positive ramp potential to the output of said integrator to cause the signal at the output thereof to change to a negative potential to switch out said first field effect transistor, a second field effect transistor having its drain connected to the output of said integrator and its supply connected to the second input of said multiplier, means responsive to the means for applying a negative potential to the first input of said integrator to apply a positive potential to the gate of said second field effect transistor to turn on said second field effect transistor and thereby apply said positive ramp potential from said integrator to the second input of said multiplier, an amplitude comparator having first and second inputs and an output, said amplitude comparator inverting the polarity of an input signal so that the output signal is of opposite polarity, means providing a constant positive potential, the first input of said amplitude comparator being connected to said constant positive potential and the second input thereof being connected to the output of said integrator, a third field effect transistor having its gate connected to the output of said amplitude comparator, its dRain to said constant positive potential means and its supply to the second input of said multiplier so that the positive ramp potential from said integrator is applied to the second input of said amplitude comparator to provide a positive signal from the output of said amplitude comparator to the gate of said third field effect transistor to thus turn on said third field effect transistor and thereby apply said constant positive potential from said constant positive potential means to the second input of said multiplier, means connected to the output of said amplitude comparator for turning off said second field effect transistor, means for again applying said positive potential to the first input of said integrator to cause said integrator to ramp with a negative slope, and means responsive to said last-mentioned means for turning off said third field effect transistor and turning said second field effect transistor.
Claim 32
Dependent Claim
17 words
The system as defined in claim 30 in which said constant positive potential means includes a potentiometer.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |