Turbine blade fatigue life analysis using non-contact measurement and dynamical response reconstruction techniques
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United States of America Patent
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Jul 16, 2019
Grant Date -
Apr 10, 2014
app pub date -
Sep 17, 2013
filing date -
Oct 5, 2012
priority date (Note) -
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Abstract
A method dynamically reconstructing a stress and strain field of a turbine blade includes providing a set of response measurements from at least one location on a turbine blade, band-pass filtering the set of response measurements based on an upper frequency limit and a lower frequency limit, determining an upper envelope and a lower envelope of the set of response measurements from local minima and local maxima of the set of response measurements, calculating a candidate intrinsic mode function (IMF) from the upper envelope and the lower envelope of the set of response measurements, providing an N×N mode shape matrix for the turbine blade, where N is the number of degrees of freedom of the turbine blade, when the candidate IMF is an actual IMF, and calculating a response for another location on the turbine blade from the actual IMF and mode shapes in the mode shape matrix.
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International Classification(s)
- G01H:MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC....
- G01M:TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR S....
- G01L:MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL ....
- G01N:INVESTIGATING OR ANALYSING MATERIALS BY DETERMININ....
- G06F:ELECTRIC DIGITAL DATA PROCESSING
- G01D:MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VAR....
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