Abstract
A pyrotechnically actuated pin puller is considered an efficient and important separation device because of its advantages of low pyroshock and no debris. However, its large size, complicated structure, and difficulty in performance testing hinder the large-scale application in weapon systems. Herein, we report a new pin puller structure with the gas inlet channels designed on the pin shaft. The novel design achieves the combination of the initiator and the pin shaft and reduces the size of the pin puller by 2 cm. A mathematical model of the movement process of this pin puller is established and further used to predict the variation rule of performance parameters. In particular, equivalent testing based on a closed bomb test (CBT) is proposed to examine the internal pressure of the pin puller calculated using the model. The experimental results of the equivalent testing are indeed consistent with the model simulation results and readily used to optimize the pin puller further in terms of the sensitivity analysis results of design parameters. The results show that our CBT-based equivalent testing can provide a facile way for the examination of the pressure of pyrotechnically actuated devices.
Highlights
Actuated devices (PADs) have elicited considerable interest as essential action actuators functioning in a weapon system through a high-pressure gas generated by the combustion of a propellant,1,2 due to the advantages of rapid response, high reliability, and strong environmental adaptability
Considering that closed bomb test (CBT) is an important experimental method for measuring the output pressure of the initiator in a constant volume through a pressure transducer,29,30 we propose CBT-based equivalent testing to estimate the internal pressure of the pin puller
Considering that the shape of the chamber has exerted a minimal effect on the pressure performance, the output pressure of the initiator in the CBT device can be regarded as the internal pressure of the pin puller under the same volumes of the chamber
Summary
Actuated devices (PADs) have elicited considerable interest as essential action actuators functioning in a weapon system through a high-pressure gas generated by the combustion of a propellant, due to the advantages of rapid response, high reliability, and strong environmental adaptability. PADs include different types, such as pin pullers, explosive bolts, catapults, and cutters.. PADs include different types, such as pin pullers, explosive bolts, catapults, and cutters.3 They have contributed important roles in various weapon systems.. PADs are frequently used for stage separation, attitude control, and fuel flow control. PADs are commonly utilized in separation, ejection, detonation, and cable cutting.. Among PADs, pin pullers have been widely investigated due to their advantages of low pyroshock and no debris PADs are commonly utilized in separation, ejection, detonation, and cable cutting. Among PADs, pin pullers have been widely investigated due to their advantages of low pyroshock and no debris
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