Investigation Of The Perturbing Natural
Frequencies Through An Evolutionary
Material Trimming Process
Author(s)
Y.-M. Chen & C. Hsiao
Abstract
Almost all engineering structures are designed by taking both structural static
and structural dynamics aspects into consideration. Structure performances are
further improved today by invoking technology from the field of optimisation.
However, optimisation of engineering structures is usually performed by
separating the static and dynamic objectives. In the static sense, the common
objectives are to reduce structural weight, to increase the structural stiffness
and/or minimise peak stress. Optimisation with dynamic objectives are usually
interested in controlling the structural natural frequency and minimising the
vibration. This paper investigates the structural dynamics characteristics of a
topologically optimised cantilever beam. The cantilever beam has been selected
for this study for its well known substructures in many applied engineering
structures. This paper attempts to investigate the perturbation process of the
fundamental natural frequency of an evolving cantilever structure while
undergoing topology optimisation. Topology optimisation is commonly
performed with the removal of unwanted material from an initial oversized and
predefined design space. This paper seeks to investigate the corresponding
changes in the structural natural frequencies subjected to evolutionary trimming
of unwanted materials.
Keywords: vibration analysis, natural frequency, evolutionary, topology
optimisation, material removal, nodal based, material trimming.
1 Introduction
A typical engineering design process involves evaluating a conceptual design
against all required criteria and functional requirements. The cycle of redesign
Keywords
vibration analysis, natural frequency, evolutionary, topology
optimisation, material removal, nodal based, material trimming.
Related Book
Other papers in this volume
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