Comfort Criteria of Vibrations
Introduction
ES-Consult has extensive knowledge in assessing the comfort experience
associated with vibrations.
VVibrations induced by the dynamic behaviour of structures and vehicles
may cause discomfort depending on a number of factors such as the frequency
content, the amplitude, the duration and the direction of the vibration.
By theoretical and numerical tools, ES-Consult provides a thorough assessment
of comfort problems.
In addition to the desk-top evaluation of vibration problems, ES-Consult
has experiences in fullscale monitoring tests. ES-Consult strongly emphasizes
this link to the real world to ensure the quality and the relevance of
the analyses. The company has at it's disposal a digital tri-axial accelerometer
allowing accurate and easily obtained measurements of vibrations in structures
of any kind.
Through experience and participation in reviews of the design basis
of larger projects and design codes in general, ES-Consult has insight
in, and up-to-date knowledge of, the current codes within the field of
dynamics and vibration comfort.
Examples of ES-Consult's experiences:
Example no. 1 - The Øresund Link
The
level of comfort, which will be experienced by train passengers on the
Øresund Link between Sweden and Denmark, has been evaluated.
This has been done by extensive numerical simulations of trains running
on the railway track through a 4 kilometres tunnel and over an 8 kilometres
long bridge. In these simulations, the importance of the interaction between
vehicle, track and structure has been fully assessed.
Example no. 2 - Composite Floor
The structural serviceability of a composite floor of an office building
has been investigated by a finite element model using modal analysis.
The analysis showed that the effect of people walking on the floor would
not cause any comfort problems according to current ISO standards.
Research and Development
ES-Consult has an active research and development policy, which means that
our knowledge within structural dynamics is at the forefront of technology.
Further, ES-Consult has close contacts with researchers at the two leading
technical universities in Denmark, The Technical University of Denmark
and Aalborg University. It also may be mentioned that ES-Consult's chairman
of the board of directors is Professor Michael Thompson, a leading researcher
in non-linear dynamics at University College London, UK.
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