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(Created page with "<font color="#4F81BD">Modal Installation guide </font> ---- Thank you for purchasing Modal software. '''Modal '''is a dedicated tool for processing a comprehensive modal...") |
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=Installation guide= | |||
Thank you for purchasing Modal software. | Thank you for purchasing Modal software. | ||
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---- | ---- | ||
=Manual= | |||
==Introduction== | ==Introduction== | ||
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* Use the integrated function for geometry modeling in Modal | * Use the integrated function for geometry modeling in Modal | ||
* | * Import geometry from UFF files; | ||
* Create geometry information in the Excel, and then copy and paste them to the | * Create geometry information in the Excel, and then copy and paste them to the "Config" view. | ||
====geometry modeling illustration==== | ====geometry modeling illustration==== | ||
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[[Image:Modal_Manual_91.gif|framed|none]] | [[Image:Modal_Manual_91.gif|framed|none]] | ||
You can create geometry information in the Excel, and then copy and paste them to the | You can create geometry information in the Excel, and then copy and paste them to the "Config" view. | ||
[[Image:Modal_Manual_92.png|framed|none]] | [[Image:Modal_Manual_92.png|framed|none]] | ||
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==Signal processing== | ==Signal processing== | ||
Signal processing wizard is designed to set the parameters for signal processing. Many signal estimations can be realized, such as power spectrum estimation, multiple input multiple output frequency response function estimation, and coherence function estimation, and so on. Five steps should be performed in this wizard: | Signal processing wizard is designed to set the parameters for signal processing. Many signal estimations can be realized, such as power spectrum estimation, multiple input multiple output frequency response function estimation, and coherence function estimation, and so on. Five steps should be performed in this wizard: Estimation, Detrending, Decimation, Fast Fourier Transform (FFT)], and Windowing. | ||
===Estimation=== | ===Estimation=== | ||
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Various signal estimation process can be set in this page. You must estimate the <nowiki>’</nowiki>FRF<nowiki>’</nowiki> if you want to perform modal parameters identification in the case of EMA. H1,H2 and Hc are three different methods for FRF estimation. Reference signal is needed for Hc method. You must estimate the <nowiki>’</nowiki>Output PSD Matrix<nowiki>’</nowiki>(for OMA NarBand Full) or <nowiki>’</nowiki>Output half PSD<nowiki>’</nowiki>(for OMA BroBand, OMA NarBand Half, and so on) if you want to perform modal parameters identification in the case of OMA. | Various signal estimation process can be set in this page. You must estimate the <nowiki>’</nowiki>FRF<nowiki>’</nowiki> if you want to perform modal parameters identification in the case of EMA. H1,H2 and Hc are three different methods for FRF estimation. Reference signal is needed for Hc method. You must estimate the <nowiki>’</nowiki>Output PSD Matrix<nowiki>’</nowiki>(for OMA NarBand Full) or <nowiki>’</nowiki>Output half PSD<nowiki>’</nowiki>(for OMA BroBand, OMA NarBand Half, and so on) if you want to perform modal parameters identification in the case of OMA. | ||
The next step of signal processing wizard is | The next step of signal processing wizard is Detrending. | ||
===Detrending=== | ===Detrending=== | ||
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The purpose of detrending is to condition the time domain signals, remove their constant or linear trend. | The purpose of detrending is to condition the time domain signals, remove their constant or linear trend. | ||
The previous step of signal processing wizard is | The previous step of signal processing wizard is Estimation, and the next step is Decimation. | ||
===Decimation=== | ===Decimation=== | ||
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There are not any anti-aliasing filters in some low-cost data acquisition. It will greatly improve the quality of estimation for you to sample data with high frequency and then decimate them in Modal, partly compensating for the loss of anti-aliasing filters. | There are not any anti-aliasing filters in some low-cost data acquisition. It will greatly improve the quality of estimation for you to sample data with high frequency and then decimate them in Modal, partly compensating for the loss of anti-aliasing filters. | ||
The previous step of signal processing wizard is | The previous step of signal processing wizard is Detrending, and the next step is setup of FFT]. | ||
===Setup of FTT=== | ===Setup of FTT=== | ||
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<nowiki>’</nowiki>Average No.<nowiki>’</nowiki> specifies the number of average during the FFT calculation. Its default value is 0, which means the maximum possible average numbers. When the number specified by the user is larger than the maximum average number, it will be modified to the maximum average number automatically | <nowiki>’</nowiki>Average No.<nowiki>’</nowiki> specifies the number of average during the FFT calculation. Its default value is 0, which means the maximum possible average numbers. When the number specified by the user is larger than the maximum average number, it will be modified to the maximum average number automatically | ||
The previous step of signal processing wizard is | The previous step of signal processing wizard is decimation, and the next step is windowing. | ||
===Windowing=== | ===Windowing=== | ||
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The flattop window is most useful in accurately measuring the amplitude of specified frequency components such as filter characters. | The flattop window is most useful in accurately measuring the amplitude of specified frequency components such as filter characters. | ||
This is the last step of the signal processing wizard, and the previous step is | This is the last step of the signal processing wizard, and the previous step is setup of FFT. Press the <nowiki>’</nowiki>Finish<nowiki>’</nowiki> button to confirm all the parameters set in the wizard, and you can begin to signal processing now. | ||
The sampling times can be set to 2.56 or 2. Usually in an EMA analysis it is set to 2.56, and in an OMA analysis it is set to 2. If the sampling times is 2.56, then the number of the spectral line will be 1/2.56 of the FFT length, and the analysis frequency range will be 1/2.56 of the sampling frequency. If the sampling times is 2, then the number of the spectral line will be half of the FFT length, and the analysis frequency range will be half of the sampling frequency. | The sampling times can be set to 2.56 or 2. Usually in an EMA analysis it is set to 2.56, and in an OMA analysis it is set to 2. If the sampling times is 2.56, then the number of the spectral line will be 1/2.56 of the FFT length, and the analysis frequency range will be 1/2.56 of the sampling frequency. If the sampling times is 2, then the number of the spectral line will be half of the FFT length, and the analysis frequency range will be half of the sampling frequency. | ||
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You can get the modal parameters of structures via EMA or OMA, by performing the following four steps: (1)Signal processing to get frequency response functions (for EMA) or output power spectrum matrices (for OMA); (2) Selecting an appropriate identification algorithm;（3）Doing modal identification; (4) Operating the identification results, such as viewing mode shapes, copying, and removing, and so on. | You can get the modal parameters of structures via EMA or OMA, by performing the following four steps: (1)Signal processing to get frequency response functions (for EMA) or output power spectrum matrices (for OMA); (2) Selecting an appropriate identification algorithm;（3）Doing modal identification; (4) Operating the identification results, such as viewing mode shapes, copying, and removing, and so on. | ||
Almost all the algorithms begin with the Modal Indicator Function (MIF) | Almost all the algorithms begin with the Modal Indicator Function (MIF). | ||
The following modules are available in Modal: | The following modules are available in Modal: TD ODS, FD ODS, EMA Narband (CMIF), EMA SelBand-SIMO (RFOP), EMA SelBand-MIMO 1 (FDPR), EMA SelBand MIMO 2 (RFPM), EMA BroBand (BBFD), OMA NarBand Full (FSDD), OMA NarBand Half (CMIF), and OMA BroBand (OBFD). A NarBand method means an algorithm performed in a narrow frequency band, who has the biggest advantage of simple and easy to use. You can identify the modes only by picking the peaks of MIF one by one. A SelBand method means an algorithm performed in one or several selected frequency bands. A BroBand method means an algorithm performed in a broad frequency band or even the full frequency band sometimes. | ||
An effective tool | An effective tool Modal Assurance Criterion (MAC) is also provided to validate the result of modal identification. | ||
===Modal Analaysis process illustration=== | ===Modal Analaysis process illustration=== | ||
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==Import / Export== | ==Import / Export== | ||
Data and all kinds of results can be exported or printed, which provides you great convenience to write a report or give a presentation. These functions include: | Data and all kinds of results can be exported or printed, which provides you great convenience to write a report or give a presentation. These functions include: Importing data, exporting data, m exporting table,export graphics, exporting animations, print preview and print]. | ||
===Import=== | ===Import=== | ||
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Data such as input signals, output signal, frequency response functions, power spectrums, and coherences can be exported to UFF files or ASCII files in the "Data" tab page of Workspace shortcut panel. | Data such as input signals, output signal, frequency response functions, power spectrums, and coherences can be exported to UFF files or ASCII files in the "Data" tab page of Workspace shortcut panel. | ||
All the data in the | All the data in the data table view can be exported to an ASCII file. | ||
====Table==== | ====Table==== | ||
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* Press the "Record" button | * Press the "Record" button | ||
[[Image:Modal_Manual_184.png|framed|none]] | [[Image:Modal_Manual_184.png|framed|none]] | ||
in the "3D Display" shortcut panel (or using the right click menu), and enter the wanted file name. The default name can be changed from the dialog of " | in the "3D Display" shortcut panel (or using the right click menu), and enter the wanted file name. The default name can be changed from the dialog of "Set Properties...". | ||
* Saving progress will be displayed in the status bar. You can play this AVI file with some media player, or insert it to the WORD/PowerPoint documents. | * Saving progress will be displayed in the status bar. You can play this AVI file with some media player, or insert it to the WORD/PowerPoint documents. | ||
* The AVI file is encoded with the CODEC you set in the dialog of " | * The AVI file is encoded with the CODEC you set in the dialog of " Set Properties...". Some CODECs might fail to work correctly. If this happens, please select another one in the dialog of "Set Properties...".. | ||
* Different CODEC leads to different play quality and different file size, you can select the best after trying all. | * Different CODEC leads to different play quality and different file size, you can select the best after trying all. | ||