PSA 9.4 — Harmonic Analysis: Rotating and Reciprocating Machines as Tireless Excitation
Lesson 9.1 left a compressor discharge line with a coincidence: a span at 10.4 Hz, a machine whose dominant pulsation order lands at 10.0 Hz, and every static check passing with room to spare. Here is how the force actually gets into the pipe, and what it does when it arrives on the beat.
Near the machine the header makes a plain L: a straight leg out of the pulsation bottle, then a 90° elbow into a 5.5 m leg that runs to an anchor. Nobody put a lateral guide at the elbow. It was a hot line, the elbow…
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