Seeds a Transmissibility (TRN) chain with a single measurement (ODSFRF, Cross spectrum, or FRF) to yield a single reference set of ODSFRFs, Cross spectra, or FRFs.
Experimental ODS's and mode shapes require a single reference set of measurements, or a set o f simultaneously acquired measurements
A Transmissibility is defined as the Fourier spectrum of a vibration response divided by the Fourier spectrum of a another vibration response, acceleration, velocity, or displacement
A TRN Chain is a series of Transmissibility's with overlapping DOFs, for example TRN (1Z:2Z), TRN (2Z:3Z), TRN (3Z:4Z), TRN (4Z:5Z),...
A TRN Chain has several advantages of a single (fixed) reference set of measurements,
Only structural responses are required. This means that operating data can be acquired from an operating machine or from any structure where the excitation forces cannot be measured
TRN measurements account for any changes in the excitation force levels during acquisition
Data for calculating a TRN Chain can be with two sensors and two short wires from the sensors to the acquisition hardware
A TRN chain can be seeded (multiplied by) any Auto spectrum measurement to obtain a single reference set of ODSFRFs
A TRN chain can be seeded (multiplied by) any Cross spectrum measurement to obtain a single reference set of Cross spectra
A TRN chain can be seeded (multiplied by) any FRF measurement to obtain a single reference set of FRFs
The seed measurement must be stored in the same Data Block as the TRN chain before executing this command.
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