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Rotor blades have infinite vibration modes
yet only the first ones have practical utilization.
The vibration mode frequencies are important
parameters for the blade testing as they are in direct relationship with
the mass distribution, design quality, and quality of shape, material,
finishing and mounting.
As for the rotor assembly, the analysis of
the resonance frequency leads to the identification of the loose or
cracked blades.
The
DSA 500 analyzer features special
functions to be used for testing optimization and processing of results:
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Programmable
position and level triggering
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Widely programmable acquisition frequency
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FFT analysis on programmable time intervals
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Automatic resonance frequency detection
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Limit exceeding warning
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Proprietary format and export to Excel
Equipment BSM 002 is being used to measure
the blade static moment.
Triggering functions automatically update
the data after each hit with the hammer.
Data acquisition continues up to the
completion of the whole buffer.
The FFT analysis of the vibrations may be
performed on the entire buffer or a programmable time interval with
various types of FFT windows.
The Blade Frequency Measurement
function automatically identifies within the FFT spectrum the
resonance frequencies and displays them in a easy-readable format.
Data is being exported into new files or
already existing files where it adds to previous recorded data.
Each data set is customized with the date, time, blade
number and operator’s name.
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