Abstract
During a football game, the ambient vibrations at the roof of a
football stadium were recorded. A very large data set consisting of 4
hours of data, sampled at 80 Hz, is available. By a data reduction
procedure, the complete data set could be analysed at once in a very
short time. The data set was also split in shorter segments
corresponding to certain events before, during and after the game to
investigate the influence of varying operational conditions on the
dynamic properties.
As the structural vibrations were caused by unmeasurable wind and crowd
excitation, Operational Modal Analysis has to be applied to find the
dynamic characteristics of the structure. The new operational PolyMAX
parameter estimation method is used and compared with Stochastic
Subspace Identification. Stochastic Subspace Identification requires
the correlations between the responses as primary data, whereas PolyMAX
operates on spectra or half spectra (i.e. the Fourier transform of the
positive time lags of the correlation functions). The main advantage of
PolyMAX is that it yields extremely clear stabilisation diagrams,
making an automation of the parameter identification process rather
straightforward. This enables a continuous monitoring of the dynamic
properties of a structure.
football stadium were recorded. A very large data set consisting of 4
hours of data, sampled at 80 Hz, is available. By a data reduction
procedure, the complete data set could be analysed at once in a very
short time. The data set was also split in shorter segments
corresponding to certain events before, during and after the game to
investigate the influence of varying operational conditions on the
dynamic properties.
As the structural vibrations were caused by unmeasurable wind and crowd
excitation, Operational Modal Analysis has to be applied to find the
dynamic characteristics of the structure. The new operational PolyMAX
parameter estimation method is used and compared with Stochastic
Subspace Identification. Stochastic Subspace Identification requires
the correlations between the responses as primary data, whereas PolyMAX
operates on spectra or half spectra (i.e. the Fourier transform of the
positive time lags of the correlation functions). The main advantage of
PolyMAX is that it yields extremely clear stabilisation diagrams,
making an automation of the parameter identification process rather
straightforward. This enables a continuous monitoring of the dynamic
properties of a structure.
| Original language | English |
|---|---|
| Title of host publication | SHOCK AND VIBRATION |
| Publication status | Published - 2007 |
| Event | Finds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet - Stockholm, Sweden Duration: 21 Sept 2009 → 25 Sept 2009 |
Publication series
| Name | 23rd International Modal Analysis Conference |
|---|
Conference
| Conference | Finds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet |
|---|---|
| Country/Territory | Sweden |
| City | Stockholm |
| Period | 21/09/09 → 25/09/09 |
Keywords
- ADD/