Induction-Melt Solder Joint Release for Ultralow-Shock Separation
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Solution Overview
Problem
Current Hold-down and Release Mechanisms (HRMs) in aerospace rely heavily on pyrotechnic systems, which pose hazards due to shock generation, are costly, and have reliability issues, failing to meet ultralow shock requirements and demanding temperature and tension ranges, while alternative non-explosive solutions like Shape Memory Alloys and fuse wire-based systems face limitations and reliability concerns.
Innovation Solution
A non-explosive release system utilizing a segmented structural element with a solder joint that is electromagnetically heatable, allowing for the generation of a time-varying magnetic field to melt the solder alloy at a predefined temperature, enabling the separation of segments and thus the release of structures, which is more efficient, reliable, and cost-effective.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pyrotechnic HRMs are used, then release function is achieved, but shock generation and safety hazards increase
Solution Approach 1:
The patent replaces the pyrotechnic (chemical) release mechanism with an electromagnetic induction-based melting system. The solder joint is heated through electromagnetic induction from a coil, causing controlled melting and release without pyrotechnic explosives, thereby eliminating shock generation while maintaining release reliability
Solution Approach 2:
The patent utilizes the phase transition of the solder alloy from solid to liquid state through controlled electromagnetic heating. The solder joint melts at a specific temperature threshold, providing a predictable and reliable release mechanism that avoids the shock problems of pyrotechnic systems
2Reliability
If pyrotechnic HRMs are used, then release function is achieved, but cost and safety-related expenses increase
Solution Approach 1:
The patent employs a disposable solder joint that melts after serving its purpose of holding the structure during launch. This eliminates the need for expensive pyrotechnic systems while achieving the same release function, reducing both manufacturing costs and safety-related expenses
Solution Approach 2:
The substitution of pyrotechnic systems with electromagnetic induction and melting mechanics reduces dependency on expensive safety protocols and handling procedures associated with pyrotechnics, thereby reducing overall system cost
3Object-affected harmful factors
If SMA-based actuators are used, then non-explosive release is achieved, but mechanical complexity and temperature limitations increase
Solution Approach 1:
The patent extracts the complex mechanical elements from the release system by using a simple solder joint that melts to enable release. This eliminates the need for complex SMA mechanisms, reducing mechanical complexity while maintaining non-explosive operation
Solution Approach 2:
The patent uses the phase transition of solder alloy (solid to liquid) as the release mechanism, which is simpler and more reliable than SMA-based phase transition systems, thereby reducing mechanical complexity
4Object-affected harmful factors
If fuse wire-based systems are used, then non-explosive release is achieved, but reliability and temperature range limitations increase
Solution Approach 1:
The patent replaces fuse wire-based thermal systems with electromagnetic induction heating, which provides more reliable and controlled heating without the reliability issues of fuse wire systems, while maintaining non-explosive operation
Solution Approach 2:
The patent uses controlled electromagnetic heating to achieve the phase transition of solder alloy, providing more reliable temperature control and system reliability compared to fuse wire-based thermal systems
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 solution achieves ultralow shock levels, covers a wide range of tensions and temperatures, is mechanically simple, and cost-effective, while avoiding debris and export control restrictions, offering a reliable and efficient alternative to pyrotechnic systems.
Implementation Method 1
magnetic field generating means configured to, upon reception of a release command, generate a time-varying magnetic field through the solder joint such that to cause heating thereof up to the predefined melting temperature of the solder alloy
Implementation Method 2
generate a time-varying magnetic field through the solder joint such that to cause heating thereof
Implementation Method 3
heating thereof up to the predefined melting temperature of the solder alloy, thereby causing melting of said solder alloy
Data Source
AI summary
The present invention relates to a release system (1, 2, 3, 4, 5), that includes a segmented structural element (10) comprising: a first segment (10a) designed to be coupled to a first structure, a second segment (10b) designed to be coupled to a second structure, and a solder joint (11) joining respective ends of said first (10a) and second (10b) segments, thus holding down the first and second structures with respect to one another; wherein said solder joint (11) is electromagnetically heatable and includes a solder alloy having a predefined melting temperature. The release system (1, 2, 3, 4, 5) is characterized by further including magnetic field generating means (13, PW1, PW2, PW3, PW4, PW5) configured to, upon reception of a release command, generate a time-varying magnetic field through the solder joint (11) such that to cause heating thereof up to the predefined melting temperature of the solder alloy, thereby causing melting of said solder alloy; whereby separation of the first (10a) and second (10b) segments is caused, thus enabling release of the first and second structures from one another.