Peak acceleration limiter for vibrational tester
Abstract
Abstract AN ELECTRONIC DETECTION AND PROTECTION SYSTEM IS PROVIDED FOR USE WITH VIBRATIONAL OR DYNAMIC TESTING APPARATUS FOR QUALIFICATION OF AN OBJECT SUCH AS A SPACECRAFT COMPONENT, AND FOR PREVENTING DAMAGE TO THE OBJECT DURING TESTING. THE SYSTEM RESPONDS TO PEAK ACCELERATIONS OF EITHER POLARITY ABOVE A PREDETERMINED AMPLITUDE THRESHOLD, AS PERCEIVED BY TRANDUCER MEANS MOUNTED ON THE OBJECT UNDER TEST, TO INSTITUTE CONTROL EFFECTS SUCH AS DEACTIVATING THE TEST APPARATUS OR ACTUATING ALARM INDICATORS, OR BOTH. THE SYSTEM ALSO RESPONDS TO THE TRUE ROOT MEAN SQUARE CURRENT OF THE ALTERNATING CURRENT EXCITING SIGNALS FLOWING IN THE ELECTRICAL DRIVE OF THE TEST APPARATUS WHENEVER A PREDETERMINED AMPLITUDE THRESHOLD IS EXCEEDED TO INITIATE THE SAME CONTROL EFFECTS SO AS TO PROTECT THE ELECTRICAL DRIVE.
Inventors
- 👤 Carl P Chapman
Bibliographic Details
Claims Analysis
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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) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |