The power spectral density (PSD) is one of the primary ways we characterize random or broadband signals. In many cases, a PSD is read from a signal analyzer and used qualitatively to describe the frequency content of a signal. But to do anything quantitative with a PSD, we need to understand its units.
Continue reading Units of Power Spectral Density
Most people interested in machines know that adding a slight crown to a pulley tends to keep flat belts centered. But it is not obvious how it works.
Continue reading How Crowned Pulleys Make Belts Track
Paraview is a very powerful tool for post-processing and displaying data, especially from FE or CFD simulations. But because it typically acts on the mesh without the underlying geometry, it doesn’t inherently know about the edges of parts or volumes. In this post, I run through the steps to detect the edges and draw them as a wireframe.
Continue reading How to Get Part Edges to Show in Paraview or ParaFOAM
We can’t get very far in the understaning of machines and structures without thinking about their deformation. For solids, we usually describe the deformation in terms of strain. For a fluid, we usually speak of strain rate.
Continue reading Strain and its Transformation
Look at the document source to see how to
strike out text, how to use different colors, and how to link to URLs with snapshot preview and how to link to URLs without snapshot preview.
There is a command which is ignored by pdflatex and which defines where to cut the post in the version displayed on the main page Continue reading Testing Latex2WP