Modular vibratory force generator, and method of operating same
US5903077A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 19, 1998 |
| Grant date | May 11, 1999 |
| Priority date | — |
| Expiry date | Feb 19, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10K2210/3212
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A modular vibratory force generator (10) is adapted to be mounted on a helicopter fuselage (11) and operated to selectively apply a controllable vibratory force (F.sub.R) thereto. The improved generator includes a plurality of force-generating modules (12, 12) and a closed-loop servocontroller (13). Each module has a pair of counter-rotating eccentric masses (20, 21) that are arranged to exert a fixed-amplitude variable-phase individual force at spaced locations on the fuselage. These individual forces (F.sub.1, F.sub.2) combine to exert a controllable-amplitude resultant vibratory force (F.sub.R) on the structure. The servocontroller is adapted to be supplied with a single sinusoidal control signal and is operative to cause the frequency and phase of the resultant vibratory force to be identical to the frequency and phase of the control signal and to cause the amplitude of the resultant vibratory force to be proportional to the amplitude of the control signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.