How can I export complex FRF data in ASCII files especially UFF58 format?

Question

Background:
I have a problem saving analysed data into a format that another software program (MODENT) can import.
I am using "SVA_Impact TEST (DAQmx).seproj", to acquire force and acceleration signals from a SISO hammer model test, and process up to the stage of an FRF and coherence plot. I need to export the FRF information into MODENT, meaning it must contain both magnitude and phase (real and complex) information in one file. (MODENT does not need the coherence information, which is only really used during the testing process to know we have good test data. The coherence information can already easily be saved into ASCII text file, and kept for test records - not a problem).
MODENT is a speciaised modal analysis package, and the FRFs from tests can be imported into its processing environment using its "utilities". The standard is a UFF58 file containing the FRF information.
Labview does not seem to be able to export the FRF data in UFF58 format. In general, Labview can export to UFF58, but only the real information, not the complex information - is this correct?
Is there a way to export the real and complex information from FRFs using one file.
I am working on this problem from both ends:
1. MODENT support, to help interface into MODENT.
2. Lavbiew support, to try to generate an exported file format with all necessry analysed data.

Answer 1

Hi
Have a look at the "seproj" and "vi" versions I mentioned in this thread - both available from the supplied example VIs in Signal Express and Labview. I've also attached these here.
The "seproj"version has what are called "limits" for the input data, meaning it cheks certain criteria to make sure the test data sentfor analysis (to give the FRF) is wihin certain limits: 1. "overload" where the amplitude must be below a set maxiumum, 2. "time", where the signal must deacy to zero within the time envelope. These are useful test check functions to have.
I looked at the conversion from SE to Labview VIs, but if I understand correctly, this essenetially embeds the SEproject in Labview, but does not allow the same use of viewing of the user windows during testing (eg seeing the overload plots, editing the overload levels, etc)?
Other settings:
-signal input range, sensitivity, Iex source, Iex value, dB reference, No. of samples and sample rate.
-triggering off the hammer, with all the setting optons shown in step setup for "trigger"
-all settings associated with the load and time limits; presented in a very useful format of either defining by X,Y coordinates, or by scalling.
-all config and averaging options for the freqency response.
The practise envirnoment in the SEProj version is also useful, as getting the technique right for using the hammer is not always easy, and it allows a quick check of basic settingsbefore doing the actual tests.
The Nyquist plot in the VI version is useful.
Happy New Year to everyone !
Attachments:
SVA_Impact Test (DAQmx) demo.seproj ‏307 KB
SVXMPL_Impact Test (DAQmx).vi ‏75 KB