Although some restrictions are still pointed out and the format is considered obsolete by the original developer, it presents a certain degree of universal- ity [6] and remains a standard for the experimental dynamics community, especially in the area of modal analysis.
A number, at the script heading, is dedicated to a specific content: geometries, FRF data or results. For example, the format 58 is associated to the FRF measurement. The format defines a header that contains general information about the data contained in the file function type, response direction,. Structure of universal files The proposed approach is clearly academic but the toolbox makes a link with commercial soft- ware with the help of UFF files.
Any structural analysis can be performed with both approaches. These methods exploit interesting properties of a FRF like the circularity in the immediate vicinity of resonance or the linearity of inverted FRFs, which are associated to important statement in modal analysis theory [8].
In this case, the use of indicators may turn out useful. The validation will be performed with collinearity properties, MAC and visualisation techniques. The matrix manipulation offered by MatLab presents the important advantage to easily analyse a FRF in any requested format through a user-friendly interface. Contrary to MatLab, SciLab is an open source high-level computational package and a numerical educational tools but available for commercial use also. It is one of several open source alternatives to MatLab.
As its syntax is similar to MatLab, SciLab includes a source code translator for assisting the conversion of scripts and functions from MatLab to SciLab. Due to the openness of the software, some user contributions have been integrated into the main program. The long-term in- terest is to dispose of a large tool set including relevant and interesting frequency and time-domain modal analysis approaches.
Obviously, to be included in the toolbox, the function debugging must be performed in both supports. Example 1: a cantilever beam The cantilever beam is probably the most popular system for illustrating the modal analysis. The students are indeed encouraged to learn the principles of vibrations, through analytical, numerical and experimental analyses. A specific configuration of the cantilever beam is imposed with fixed geometrical dimensions, with or with lumped mass at the end to each student.
The experimental modal data serve to validate these aforementioned approaches. Figure 3 and 4 display examples of results obtained with EasyMod. The information provided by the circle—fit method gives interesting findings Figure 3 , by illustrating the circularity around the analysed natural frequency, and its dependency with the number of samples.
If the structure is low-dampened, the limitation of this method is clearly revealed. Information provided by the circle—fit method Figure 4. Figure 4 shows the same analysis with the LF method, where the linear property of the inverted FRF is taken into account. Example 2: a dof model The second system is a noise—free dof system [10] excitated by three incoherent random sources at points 1, 2 and 9 and schematically illustrated on Figure 5.
This operation is trivial on MatLab or SciLab. Preview Mode allows for viewing how proposed changes will look in a file. Robust installer. The program is ready to accept translations for multiple languages. Install MODs to all installed themes.
Install MODs to all installed languages. Automatically backups up files before modifying. You should still make your own backups, though! Continued processing if non-English or non-subSilver file fails. You decide if you want to continue or not. Password protected. Even administrators cannot access EM unless the board owner gives them the password. Object oriented programming.
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