P&W Test Stand C12 was modified to increase the natural frequency of the stand from a low to high frequency stand. The change in natural frequency was necessary to suppress vibration and allow accurate thrust measurement for the Joint Strike Fighter (JSF) military jet engine. Four support legs, weighing 50 tons each, were added to convert the structure from a “hangman” configuration to a “tripod” configuration. Each leg has a 300-ton mass of concrete at its base. EDF was responsible for the engineering design and construction management of this project.
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