A Concept of Self-Identification of Adaptive Structures with Variable Geometric Properties

Paper number

IAC-05-C2.4.05

Author

Dr. Atsuhiko Senba, Tokyo Institute of Technology, Japan

Coauthor

Prof. Hiroshi Furuya, Tokyo Institute of Technology, Japan

Year

2005

Abstract

The objective of this paper is to propose a concept of self-identification of adaptive structures with variable geometric properties. The concept of self-identification has been proposed, which is the identification of structural characteristics by using variable structural parameters such as the variable stiffness, variable damping and variable mass parameters. By extending the research, we focus on the self-identification with variable geometric properties. 

As the conceptual model with the variable geometric properties, we consider a simple variable geometry device, which is made up of two rods whose relative angle and rotational spring constant are variable. It is assumed that the one end of the variable geometry device is attached to the uncertain structure, whose mathematical model is assumed to be unknown. To identify the structural characteristics of the uncertain structure, the change of the natural frequency depending on the relative angle of the variable geometry device is measured by a limited number of sensors at the nodal point of the variable geometry device. Theoretical analyses show that when the relative angle of the variable geometry device is changed, we can identify the unknown inertia and stiffness properties of the uncertain structure. 

A numerical example for the self-identification of an uncertain rod structure attached with the two-DOF variable geometry device is examined to show the possibility of the concept. From the change of the first natural frequencies when the relative angle is changed, the inertia and stiffness parameters of the uncertain rod are identified with the exact measurement of the natural frequencies. The result indicates the possibility of the concept of self-identification with the variable geometric properties. 

Abstract document

IAC-05-C2.4.05.pdf

Manuscript document

IAC-05-C2.4.05.pdf (🔒 authorized access only).

To get the manuscript, please contact IAF Secretariat.