Difference between revisions of "Geopsy: Structure spectrum"
(New page: '''Structure spectrum''' is an advanced signal processing tool aiming at computing the Transfer function of a system, i.e. to deconvolve signals, mainly civil engineering...) |
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| − | '''Structure spectrum''' is an [[Geopsy: Tools|advanced signal processing tool]] aiming at | + | '''Structure spectrum''' is an [[Geopsy: Tools|advanced signal processing tool]] aiming at estimating the Transfer function of a system, i.e. to deconvolve signals, mainly in civil engineering structures. |
| + | Creates a new [[Geopsy: Signal Viewer|signal viewer]] | ||
==Background== | ==Background== | ||
, i.e. the solution of the homogeneous equation | , i.e. the solution of the homogeneous equation | ||
| − | + | Warning no real Transfer function, good in frequency, not in amplitude (Konno et Omachi) | |
==Pre-Processing== | ==Pre-Processing== | ||
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**''Difference'' computes the difference signal 1 minus signal 2 for each pair of signals. For bottom and top recordings in a building, this corresponds to the relative motion of the structure (see [[#Background|Background]]) | **''Difference'' computes the difference signal 1 minus signal 2 for each pair of signals. For bottom and top recordings in a building, this corresponds to the relative motion of the structure (see [[#Background|Background]]) | ||
**''Average'' computes the average of each pair of signals. It seems to be an obsolete option. | **''Average'' computes the average of each pair of signals. It seems to be an obsolete option. | ||
| + | After clicking ''OK'', the processing toolbox appears. | ||
| + | ==Processing Toolbox== | ||
| − | + | The processing toolbox is the same used for H/V and Spectrum and is described [[Geopsy:_H/V_and_Spectrum_Toolboxes|there]]. | |
| − | + | ==Results== | |
| − | |||
Revision as of 16:20, 12 March 2010
Structure spectrum is an advanced signal processing tool aiming at estimating the Transfer function of a system, i.e. to deconvolve signals, mainly in civil engineering structures.
Creates a new signal viewer
Background
, i.e. the solution of the homogeneous equation
Warning no real Transfer function, good in frequency, not in amplitude (Konno et Omachi)
Pre-Processing
Before starting the Structure spectrum toolbox, the signals should be rearranged by pairs. In the pre-processing toolbox (see below), check-boxes allow to discard Z, N or E components, therefore simplifying this procedure. Moreover, in case of odd number of signals, the last one is removed. The toolbox will compute the Transfer function between the first and the second signal, i.e. the spectral ratio of the second over the first signal. In a building, the bottom recording should therefore be placed first and the top recording second.
When starting the Structure spectrum toolbox using the Menu Tools or using the Toolbar, a pop-up menu allows several pre-processing:
- Excludes components. 3 check boxes allow to discard Vertical and/or North and/or East components. This is to help the rearrangement of signals.
- Third signal operation. A third signal is added to each pair of signals that will be used in the deconvolution (see Deconvolution). Two possibilities are offered:
- Difference computes the difference signal 1 minus signal 2 for each pair of signals. For bottom and top recordings in a building, this corresponds to the relative motion of the structure (see Background)
- Average computes the average of each pair of signals. It seems to be an obsolete option.
After clicking OK, the processing toolbox appears.
Processing Toolbox
The processing toolbox is the same used for H/V and Spectrum and is described there.
