4 research outputs found
New ostracods of the family Cytheruridae G. Mueller from the Barremian-Albian of the Southwestern Crimea
Estimation of burst-mode LDA power spectra
The estimation of power spectra from LDA data provides signal processing
challenges for fluid dynamicists for several reasons: acquisition is dictated
by randomly arriving particles, the registered particle velocities tend to be
biased towards higher values and the signal is highly intermittent. The signal
can be interpreted correctly by applying residence time weighting to all
statistics and using the residence-time-weighted discrete Fourier transform to
compute the Fourier transform. A new spectral algorithm using the latter is
applied to two experiments; a cylinder wake and an axisymmetric turbulent jet.
These are compared to corresponding hot-wire spectra as well as to alternative
algorithms for LDA signals such as the time slot correlation method,
sample-and-hold and common weighting schemes