Nodal/modal control and power intensification methods and apparatus for vibration testing
US4181027A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 19, 1978 |
| Grant date | Jan 1, 1980 |
| Priority date | — |
| Expiry date | Apr 19, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M7/022
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Controllability and performance of resonating, compliant, simply excited, self-attenuating driving and driven sets of structures coupled to pneumatic vibrators is usefully enhanced by means of altering mode shapes by forcibly creating nodes and partial nodal lines and by means of intensifying power transmitted to test items by forcibly increasing acceleration transmissibility. These devices, when included in a vibration system, enable different test items to be vibration tested at selectable repeatable levels under controlled conditions of multi-frequency, multi-degree-of-freedom acceleration history, to achieve a frequency spectrum and acceleration-level control of a broadband quasi-random vibration output. Specific design of the size, mass, and resonant behavior of the driving and driven structure sets with appropriate transmissibility characteristics of the elastomeric interface results in controlled multi-modal, uniform RMS acceleration, multi-degree-of-freedom, frequency-bounded vibration testing. In a first embodiment, points or regions on vibration device structures forcibly are constrained to form nodes by localized immobilization of the driving structure and/or localized s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.