Pyrotechnic Shroud Separation Apparatus for Airborne Vehicles
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Solution Overview
Problem
Existing nose cone removal systems for airborne vehicles face issues with sealing problems, clamping, excess weight, increased manufacturing costs, and safety concerns due to their complex and asymmetric designs, which disrupt aerodynamic efficiency and pose risks during pyrotechnic charge detonation.
Innovation Solution
A novel apparatus featuring a fastening assembly that tears upon stretching and a separate piston assembly disassembled upon completion of its stroke, both operating with parallel and orthogonal axes, ensuring efficient and safe removal of the nose cone without disrupting the shroud's integrity or stability, and incorporating a safety mechanism to prevent accidental separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a complex fastening assembly with threads and nuts is used to secure the nose cone, then the nose cone can be firmly attached, but sealing problems occur and gas leaks during pyrotechnic charge detonation
Solution Approach 1:
The fastening assembly is divided into two separate functional components: a piston assembly that provides the separating force and a fastening assembly that secures the nose cone. This segmentation allows each component to be optimized independently, with the fastening assembly designed specifically for secure attachment without compromising sealing integrity during pyrotechnic charge detonation.
Solution Approach 2:
The piston assembly is extracted as a separate, disposable component that is positioned at a distance from the fastening assembly. The piston assembly is given to be torn on stretching and is disassembled upon completion of its stroke, removing the source of gas pressure generation from the sealed fastening system, thereby eliminating the sealing problems that occur when threads and nuts are used under high pressure.
2Ease of manufacture
If a symmetric design with cylindrical components is used for the nose cone assembly, then manufacturing is simplified, but clamping occurs between components during separation
Solution Approach 1:
The design intentionally introduces asymmetry by positioning the piston assembly at a distance and separating it from the fastening assembly, with the piston assembly oriented at essentially parallel and essentially orthogonal axes relative to the shroud's lengthwise axis. This asymmetric configuration prevents the cylindrical components from interlacing and clamping together during separation, while the fastening assembly itself can remain symmetric for ease of manufacture.
Solution Approach 2:
A safety means is introduced as an intermediary component that mechanically assures the pyrotechnic charge is protected from inadvertent or due to a failure detonation. The safety means is extractable and removal, providing a controlled mechanism that prevents premature activation while allowing intentional separation when needed, thereby eliminating the harmful clamping effect during uncontrolled separation events.
3Reliability
If a heavy-duty fastening system with multiple components is used to prevent accidental separation, then safety is improved, but the device weight and manufacturing costs increase substantially
Solution Approach 1:
The piston assembly is designed as a disposable, low-cost component that is given to be torn on stretching and is disassembled upon completion of its stroke. This inexpensive temporary structure provides the necessary safety function during launch and separation, then is discarded after use, eliminating the need for heavy, permanent safety mechanisms that would increase overall system weight and manufacturing costs.
Solution Approach 2:
A simple extractable safety means serves as an intermediary mechanical assurance device that protects the pyrotechnic charge from inadvertent detonation. This minimal safety component provides adequate protection without the complexity and weight of multi-component fastening systems, allowing the apparatus to maintain light weight while ensuring safety against accidental separation.
4Device complexity
If the piston assembly is integrated with the fastening assembly, then the structure is more compact, but the pyrotechnic charge is vulnerable to inadvertent detonation
Solution Approach 1:
The apparatus is segmented into two distinct assemblies: the piston assembly containing the pyrotechnic charge and the fastening assembly securing the nose cone. The piston assembly is positioned at a distance and separated from the fastening assembly, with parallel and orthogonal axes of operation. This physical separation isolates the pyrotechnic charge from the fastening components, preventing inadvertent detonation while maintaining structural compactness through coordinated operation of the separated assemblies.
Solution Approach 2:
The safety means serves as an intermediary protective element between the pyrotechnic charge and external influences. This extractable safety mechanism provides mechanical assurance that the pyrotechnic charge is protected from inadvertent or due to a failure detonation, while allowing the piston assembly to remain relatively compact through its separated but coordinated design with the fastening assembly.
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
The apparatus effectively addresses sealing issues, reduces weight and manufacturing costs, ensures safe operation, and maintains aerodynamic continuity, enabling efficient separation of the nose cone while preventing clamping and ensuring reliable performance across various flight parameters.
Implementation Method 1
a pyrotechnic charge that serves, upon its detonation, to generate a gas pressure that serves to tear the fastening assembly and to drive the piston assembly
Implementation Method 2
to generate a gas pressure that serves to tear the fastening assembly
Data Source
AI summary
The present invention relates to an apparatus for splitting and removing a shroud from an airborne vehicle, that comprises a shroud that includes two components, linkable one to another along their lengths, and wherein upon being fastened one to the other, they form a shroud with a lengthwise axis and an inner space, and having a base sector around the circumference of the bottom part of said shroud, and wherein said base is connectable to said airborne body and a fastening assembly for fastening said two components of said shroud one to the other, and wherein said fastening assembly is given to be torn on stretching upon detonation of a pyrotechnic charge and a piston assembly that disassembled at the completion of the piston's stroke, and is operable by said pyrotechnic charge, and wherein said piston assembly serves for timed tearing of said fastening assembly.