Method and apparatus for actively adjusting and controlling a resonant mass-spring system
US5456341A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 23, 1993 |
| Grant date | Oct 10, 1995 |
| Priority date | — |
| Expiry date | Apr 23, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB64C2027/005
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An actively-controlled resonant-type force generator (20) is adapted to be attached to a structure (21), and includes a mass (23) mounted for movement relative to the structure and a plurality of springs (22, 24) operatively arranged between the mass and the structure. A servoactuator (26) is arranged to controllably excite the mass-spring system. The actual force (F.sub.a) transmitted from the mass to the structure is compared with a commanded force (F.sub.c) to produce a force error signal (F.sub.e). The actuator is caused to produce a velocity as a function of the error signal. The gain of the closed force loop is selected so that the resonance of the mass-spring system has an effective damping ratio (.zeta.) greater than about 0.5, and preferably about 0.7. Thus, the mass-spring system will not be substantially resonantly excited by vibrations of the structure near its resonant frequency (.omega..sub.n).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.