Phase-Change Material Restraint for Delicate Device Shock Protection
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Solution Overview
Problem
Existing protection systems for delicate mechanical, electrical, or optical systems, such as MEMS, are inadequate for structures with many separate, movable elements as they either interfere with operation or are too heavy, making it difficult to implement effective shock and vibration protection without obstructing system functionality.
Innovation Solution
A method involving a liquid material that transitions to a solid state to stabilize delicate devices against shock and vibration, and then sublimates into a gas to release the device for operation, using a containment system with carbon dioxide and liquid nitrogen to achieve this.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional protection systems (stops/barriers) are used to protect delicate elements, then protection against shock is improved, but device complexity and weight increase significantly
Solution Approach 1:
The patent changes the physical state parameter of the protection material from solid (traditional) to liquid (invention). The liquid protection material is introduced in a fluid state that can adapt to complex geometries and then transformed into a solid protective barrier through controlled freezing, eliminating the need for pre-formed structural barriers and reducing overall system complexity.
Solution Approach 2:
The patent utilizes phase transitions of the protection material between liquid, solid, and gas states. The material is introduced as a liquid, frozen to solid form for protection during shock events, and then sublimated to gas for easy removal. This phase transition approach eliminates permanent structural additions and reduces device complexity.
2Reliability
If traditional protection systems are used to protect delicate elements, then protection against shock is improved, but weight increases significantly
Solution Approach 1:
The patent employs phase transitions where the protection material transforms from liquid to solid during protection events and then sublimates from solid to gas for removal. This transient solid state provides protection only when needed, while the gaseous state eliminates residual weight, making the protection system effectively weightless during operation.
Solution Approach 2:
The protection material functions as a temporary, disposable protective barrier that is introduced, used for protection during shock events, and then removed via sublimation. This short-lived protection approach avoids permanent weight additions to the protected device.
3Reliability
If protection systems are added to delicate devices with many movable elements, then protection against shock is improved, but the movable elements' operation is obstructed
Solution Approach 1:
The patent changes the state parameter of the protection material from solid to liquid to gas, allowing it to flow around and adapt to movable elements rather than blocking them. The liquid state can penetrate and protect individual movable elements without forming rigid barriers, maintaining operational freedom while providing protection.
Solution Approach 2:
The patent uses the fluid dynamics properties of liquid and gaseous states to allow the protection material to flow around, coat, and protect movable elements without obstructing their motion. The pneumatic/gas phase enables complete removal without mechanical interference, preserving ease of operation.
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
Provides effective protection against shock and vibration for delicate devices with many movable elements by stabilizing them in a solid state during exposure to destructive forces and releasing them for operation once the threat has passed, without obstructing the device's functionality or adding significant weight.
Implementation Method 1
The liquid material is cooled causing it to transition to a solid state which stabilizes the delicate device in contact with the solid material against shock and vibration
Implementation Method 2
The solid state material is heated causing it to sublimate into a gas thus releasing the delicate device for operation
Data Source
AI summary
An exemplary method protects a delicate device from potential damage from shock or vibration. A material in a liquid state is placed in contact with the delicate device. The liquid material is cooled causing it to transition to a solid state which stabilizes the delicate device in contact with the solid material against shock and vibration. The solid state material is heated causing it to sublimate into a gas thus releasing the delicate device for operation.