Experimental Study of Active Vibration Control.
Abstract
Complementary experimental-theoretical studies were conducted on three separate topics, all of which are related to the dynamics and control of highly flexible large space structures (LSS) in Earth orbit: (1) active damping of vibrations; (2) structural wave propagation; and (3) development of small, flexible laboratory structures having a maneuverable rigid body mode. In the active damping study on a laboratory structure of moderate modal complexity, very good agreement was achieved between experimental measurements and theoretical predictions. The type of active damping applied, output feedback with dual (colocated) control sensors and actuators, should be considered as a candidate for implementation on first-generation LSS because of its stability robustness. The study of wave propagation is focused primarily on transient flexural response of a two-dimensional grid structure to a suddenly applied sinusoidal force at one point. The study is not completed, so results are not presented. New laboratory structures with a maneuverable rigid body mode were build and analyzed. They were relatively simple planar structures composed of thin-walled beam members. They exhibited some unusual dynamic characteristics such as variable natural frequencies, snap buckling, and other nonlinearities. Finite element modeling generally failed to predict the measured vibration modes and the unusual characteristics.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 31, 1986
- Accession Number
- ADA173144
Entities
People
- Anthony J. Kubis Jr
- William L. Hallauer Jr.
Organizations
- Virginia Tech