Induction-Melt Solder Release Mechanism 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 fail recurrently, while non-explosive alternatives like Shape Memory Alloys (SMAs) and fuse wire-based systems face limitations in tension, temperature, and reliability.
Innovation Solution
A non-explosive release system utilizing a segmented structural element with a solder joint that is electromagnetically heatable, employing a solder alloy with a predefined melting temperature, and a magnetic field to induce heating and separation, thus releasing the segments without shocks or debris.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pyrotechnic HRMs are used, then high reliability and strong holding capability are achieved, but severe shocks are generated that endanger delicate equipment
Solution Approach 1:
The patent replaces the pyrotechnic (chemical) release mechanism with an electromagnetic system. A coil generates a magnetic field that induces eddy currents in a conductive disc, which melts a solder joint holding the disc in place. This electromagnetic-induction-based mechanism eliminates the explosive chemical reaction of pyrotechnics while maintaining reliable holding and release functionality.
Solution Approach 2:
The patent utilizes the phase transition of solder material from solid to liquid through electromagnetic induction heating. The solder joint connects the conductive disc to the housing, and when the coil is energized, the induced currents heat the solder to its melting point, causing it to transition from solid to liquid and release the disc. This controlled phase transition provides a reliable, non-explosive release mechanism.
2Strength
If pyrotechnic HRMs are used, then high holding strength is achieved, but manipulation and storage become intrinsically hazardous
Solution Approach 1:
The patent replaces the pyrotechnic (chemical) release mechanism with an electromagnetic system. A coil generates a magnetic field that induces eddy currents in a conductive disc, which melts a solder joint holding the disc in place. This electromagnetic-induction-based mechanism eliminates the explosive chemical reaction of pyrotechnics while maintaining reliable holding and release functionality.
3Object-affected harmful factors
If non-explosive alternatives like SMAs and fuse wire-based systems are used, then shock generation is reduced, but limitations in tension, temperature, and reliability occur
Solution Approach 1:
The patent employs a conductive disc with specific electrical and thermal properties, a solder joint with appropriate melting temperature, and an electromagnetic coil designed to generate sufficient induced currents. By carefully selecting and adjusting these parameters (electrical conductivity, thermal conductivity, melting point, coil turns, current amplitude), the system achieves reliable operation across required tension and temperature ranges without the limitations of SMAs or fuse wires.
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 system achieves ultralow shock levels, meets demanding tension and temperature ranges, is cost-effective, and overcomes reliability and export control issues, providing a mechanically simple and debris-free solution for HRMs.
Implementation Method 1
a solder joint joining respective ends of the first and second segments, thus securely holding down the first and second structures with respect to one another; wherein said solder joint is electromagnetically heatable and includes a solder alloy (preferably an eutectic alloy) having a predefined melting temperature
Implementation Method 2
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 3
heating thereof up to the predefined melting temperature of the solder alloy, thereby causing melting of the solder alloy
Data Source
Figure 1~2
Figure 3~5
Figure 6~8
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.