Method for determining unlocking critical charge quantity of separation nut

Abstract

Provided is a method for determining the unlocking critical charge quantity of a separation nut. The method for determining the unlocking critical charge quantity of the separation nut comprises the steps of (1) carrying out M cold air separation tests in the state of pre-tightening torque for design and installation of the separation nut, recording a cold air pressure value at the unlocking moment of the separation nut during each cold air separation test, and obtaining a mean value P of the cold air pressure values at the unlocking moments of the separation nut during the M cold air separation tests through calculation, wherein the M is no smaller than 20; (2) determining energy RT which can be generated by the unit mass of main charge according to the type of main charge of an igniter adopted for the separation nut, and estimating the critical charge quantity m[M] of the separation nut through the formula , wherein the V represents the capacity of an unlocking containing cavity of the separation nut; (3) determining the minimum main charge quantity of the igniter adopted for the separation nut according to the critical charge quantity estimation value m[M] obtained through the step (2) and on the basis that the effective charge compacting density is ensured. According to the method for determining the unlocking critical charge quantity of the separation nut, the test cost of critical charge quantity exploration tests of the separation nut can be greatly reduced, the test period of critical charge quantity exploration tests of the separation nut can be greatly shortened, and the design of the charge quantity of the igniter of the separation nut can be effectively directed.

Description

technical field [0001] The invention belongs to the technical field of pyrotechnics, and relates to a method for determining the critical unlocking charge of a separation nut, which is suitable for estimating the critical charge of the separation nut for unlocking, and can effectively guide the design of the charge of the separation nut igniter. Background technique [0002] In the design of the separation nut, the charge of the selected igniter will directly determine the size of the power source of the separation mechanism, which is one of the key links in its design. If the charge of the igniter is too large, it will affect the structural strength of the separation nut itself. While bringing design difficulty, it will lead to a severe separation impact environment; if the charge of the igniter is too small, it will affect the unlocking reliability of the separation nut. In order to determine the design requirements of the igniter, it is necessary to obtain the critical un...

AI Technical Summary

Problems solved by technology

Due to the lack of theoretical estimation in this method, the initial value of the igniter charge and the determination of the change step size are lack of basis. Usually the initial value selected is far from the actual critical unlocking charge. Often reaches more than 50 rounds, the test cost is relatively large, and due to the change of the pressure of the igniter, the test period is also long

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