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Performance Modeling of a Pyrotechnically Actuated Pin Puller
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 Title & Authors
Performance Modeling of a Pyrotechnically Actuated Pin Puller
Jang, Seung-Gyo; Lee, Hyo-Nam; Oh, Jong-Yun;
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An analytical model was developed to understand the physics and predict the functional performance of a pin puller. The formulated model is based on one-dimensional gas dynamics for an ideal gas. Resistive forces against pin shaft movement were measured in quasi-static mechanical tests, the results of which were incorporated into the model. The expansion chamber pressure and the pin shaft displacement were measured from an actual firing test and compared to the model prediction. The gas generation rate was adjusted by a correction factor, and the heat transfer rate was obtained through parametric analysis. The validity of the model is assessed for additional firing tests with different amounts of pyrotechnic charge. This model can provide knowledge on how the pin puller functions, and on which design parameters contribute the most to the actuation of the pin puller. Using this model, we estimate the functional safety factor by comparing the energy generated by the pyrotechnic charge to the energy required to accomplish the function.
Pin Puller;Pyrotechnic Actuator;Initiator;Safety Factor;
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