Pyrotechnic Rupture Device for Space Launcher Separation
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Solution Overview
Problem
Existing pyrotechnic separation processes for space launchers fail to ensure complete disengagement of elements after the securing piece is broken, as they do not effectively dissociate the cutting and distancing functions.
Innovation Solution
The process involves a securing piece with a pyrotechnic rupture device containing detonating cord sections in expansion tubes for breaking and inflatable sheaths for separation, along with deflagrating cords to enhance gas generation and spacing, ensuring mechanical force transmission and efficient separation of elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single pyrotechnic rupture device is used to break the securing piece, then the cutting function is achieved, but the distancing function is insufficient
Solution Approach 1:
The pyrotechnic rupture device is divided into multiple independent sections: detonating cord sections in expansion tubes for cutting, and detonating cord sections in inflatable sheaths for distancing. This segmentation allows each section to perform its specific function independently, ensuring both cutting and distancing are reliably achieved.
Solution Approach 2:
The patent combines two previously separate functions (cutting and distancing) into a single integrated pyrotechnic rupture device. By merging the cutting function (expansion tubes) and distancing function (inflatable sheaths) into one device, the system achieves both objectives simultaneously while reducing the number of separate components needed.
2Strength
If detonating cord is placed in expansion tubes, then the cutting of non-precut zones is effective, but no distancing effect is produced
Solution Approach 1:
The device alternates between detonating cord sections in expansion tubes (for cutting) and detonating cord sections in inflatable sheaths (for distancing). This segmentation ensures that cutting and distancing functions are performed by different sections, with each optimized for its specific purpose.
Solution Approach 2:
The inflatable sheath acts as an intermediary that converts the linear expansion force of the detonating cord into radial inflation pressure. This intermediary mechanism transforms the cutting-oriented expansion into a distancing-oriented inflation action, pushing the broken parts apart effectively.
3Length of moving object
If detonating cord is sealed in inflatable sheaths, then the distancing effect is enhanced, but the cutting capability is reduced
Solution Approach 1:
The pyrotechnic rupture device is segmented into alternating sections: some detonating cord sections are placed in expansion tubes for cutting, while other sections are sealed in inflatable sheaths for distancing. This segmentation ensures that each type of section performs its designated function without compromising the other.
Solution Approach 2:
The patent merges the cutting function (performed by expansion tube sections) and distancing function (performed by inflatable sheath sections) into a single coordinated device. The alternating arrangement ensures both functions are executed in sequence, achieving complete separation and distancing.
4Strength
If pre-cut zones are spaced apart to form alternating series with non-precut zones, then mechanical force transmission is maintained, but the structure becomes more complex
Solution Approach 1:
The securing piece is segmented into alternating pre-cut zones and non-precut zones, creating a pattern that maintains structural integrity through the non-precut zones while allowing controlled separation through the pre-cut zones. This segmentation is reflected in the alternating arrangement of expansion tube sections and inflatable sheath sections.
Solution Approach 2:
The alternating pattern of pre-cut and non-precut zones serves multiple functions: it maintains mechanical strength through non-precut zones, provides controlled separation paths through pre-cut zones, and corresponds to the alternating cutting and distancing sections of the pyrotechnic device, reducing the need for separate structural elements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution ensures reliable separation of elements by breaking the securing piece along a predetermined plane and using generated gases to move the broken parts apart, effectively addressing the disengagement issue in pyrotechnic separation.
Implementation Method 1
the detonating cord sections, associated with expansion tubes, break said non-precut zones
Implementation Method 2
the detonating cord sections, associated with sheaths inflatable, inflate the latter with the gases which they generate
Implementation Method 3
the deflagrating cords are also ignited by producing a large quantity of combustion gas contributing to the inflation of the inflatable sheaths
Data Source
Figure 1~4
Figure 2~8
AI summary
According to the invention, the component to be ruptured comprises an alternation of oblong pre-cut zones and of non-pre-cut zones and the pyrotechnique rupture device (1) with detonating cord (2) comprises an alternation of sections (1.1) for rupturing said non-pre-cut zones and of inflatable sections (1.2) for parting the broken parts of said component.