Accession Number:

ADA191454

Title:

Experimental Study of Active Vibration Control.

Descriptive Note:

Final technical rept. 30 Jan 86-31 Aug 87,

Corporate Author:

VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF AEROSPACE AND OCE AN ENGINEERING

Personal Author(s):

• Hallauer, William L., Jr

Report Date:

1987-08-31

Pagination or Media Count:

71.0

Abstract:

Complementary experimental-theoretical studies were conducted on the following subjects related to the dynamics and control of flexible large spacecraft structures 1 Transient wave propagation - Extensive results are presented for traveling waves in a laboratory structure excited by suddenly applied oscillatory point forces 2 The dynamics of a thin-walled grid with a ridgid body slewing degree of freedom - The design, theoretical analysis, experimental testing, and experimental, and experimental-theoretical correlation are reported. Even after much refinement, the finite element model of the relatively simple structure did not satisfactorily predict the measured dynamic behavior and 3 Active damping and control the slewsing gird with the use of structure-borne accelerometers and reaction wheel actuators - The results of an active vibration damping experiment are presented. Also discussed are the serious practical problems encountered in this research and the potential for future experiments with simultaneous control of maneuvering and vibration. Keywords Structural dynamics Structural wave propagation Large spacecraft structures.

Descriptors:

• *FLEXIBLE STRUCTURES
• *SPACECRAFT COMPONENTS
• *VIBRATION
• *STRUCTURAL RESPONSE
• CONTROL
• DAMPING
• DYNAMIC RESPONSE
• DYNAMICS
• FINITE ELEMENT ANALYSIS
• GRIDS
• MANEUVERABILITY
• MATHEMATICAL MODELS
• STRUCTURAL COMPONENTS
• STRUCTURAL PROPERTIES
• SYNCHRONISM
• THIN WALLS
• TRAVELING WAVES
• WAVE PROPAGATION

Subject Categories:

• Unmanned Spacecraft
• Manned Spacecraft
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE