Environmental Stress Screening with Thermal Cycling and Random Vibration
ESS applies random vibration and thermal cycling to every unit to precipitate latent workmanship and material defects into detectable failures. The Navy screen Willoughby issued — random vibration of roughly ten to twenty minutes plus thermal cycling scaled to assembly complexity, drawn from Apollo-era practice — is the direct ancestor of modern ESS and of NAVMAT P-9492.
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ESS applies random vibration and thermal cycling to every unit to precipitate latent workmanship and material defects into detectable failures. The Navy screen Willoughby issued — random vibration of roughly ten to twenty minutes plus thermal cycling scaled to assembly complexity, drawn from Apollo-era practice — is the direct ancestor of modern ESS and of NAVMAT P-9492.
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