Modifying Resonance Modes of Dissipative Structures using Magnitude and Phase Information

Modifying Resonance Modes of Dissipative Structures using Magnitude and Phase Information

Peters, H.J.
Tiso, P.
Goosen, J.F.L.
Van Keulen, A.

Mechanical, Maritime and Materials Engineering

Precision and Microsystems Engineering

2014-07-20

Several Flapping Wing Micro Air Vehicle (FWMAV) designs exploit structural resonance to decrease power consumption. Practical use of most resonating structures requires temporary modifications to the resonance mode (i.e., the eigensolution). This paper presents a systematic design approach to modify non-proportionally damped resonance modes in a desired way while consuming minimal control power. These modifications are induced by local structural changes. Eigensolution sensitivities in the modal basis are used to linearly approximate the effect of these changes on the resonance mode. Results show that the interpretation of resonance mode changes is highly clarified by introducing the modulus (magnitude) and argument (phase) information of the resonance mode. The proposed projection allows the determination of the locations at which a specific structural change scores maximum effect in terms of relative magnitude and/or phase modifications. The applied modal approach reduces the size of the problem, which is advantageous during analysis. This work shows resonance mode modifications of non-proportionally damped systems due to local structural changes in a intuitive manner.

non-proportional damping
eigensolution modification
local structural changes
modal modulus and argument

http://resolver.tudelft.nl/uuid:552d7e40-a8fc-4031-82fe-7a975f8f43d7

CIMNE

978-84-942844-7-2

Proceedings - WCCM XI: 11th World Congress on Computational Mechanics; ECCM V: 5th European Conference on Computational Mechanics; ECFD VI: 6th European Conference on Computational Fluid Dynamics, Barcelona, Spain, 20-25 July 2014

Institutional Repository

conference paper

© 2014 The Authors