SMA Spring Actuators for Aircraft Evacuation Slide Release
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional evacuation slide deployment systems for aircraft require multiple release assemblies and pressurized gas, leading to increased weight, cost, and complexity, with unnecessary components and gas delivery systems.
Innovation Solution
A release system utilizing electrically activated shape memory alloy (SMA) springs to actuate blowout panels and soft covers, reducing the need for pressurized gas and simplifying the design by integrating SMA springs into existing systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional release assemblies with multiple components and pressurized gas systems are used, then reliable deployment can be achieved, but weight and system complexity increase significantly
Solution Approach 1:
The patent extracts and eliminates the pressurized gas system from the release mechanism, replacing it with a shape memory alloy (SMA) based actuator that uses electrical activation. This removes the complex gas delivery infrastructure, regulator valves, and associated components while maintaining reliable deployment through the SMA's inherent mechanical actuation capability.
Solution Approach 2:
The patent replaces the conventional mechanical pressurized gas-based release system with an electrical-mechanical system using shape memory alloy actuators. The SMA elements convert electrical energy directly into mechanical motion to actuate the release, eliminating the need for gas pressure systems and their associated complexity.
2Reliability
If pressurized gas systems and multiple release assemblies are used, then deployment function is achieved, but weight increases due to additional components
Solution Approach 1:
The patent extracts and removes the heavy pressurized gas cylinders, delivery manifolds, and regulator components from the system. The replacement SMA actuators are significantly lighter, as they only require electrical power and consist of compact metallic alloy elements with integrated spring mechanisms.
Solution Approach 2:
The patent substitutes the heavy mechanical pressurized gas system with lighter electrical-mechanical SMA actuators. The SMA elements, combined with simple spring mechanisms, provide the necessary actuation force without requiring the weight of gas storage and delivery infrastructure.
3Reliability
If conventional release assemblies with multiple components are used, then deployment is achieved, but cost increases due to unnecessary components
Solution Approach 1:
The patent extracts and eliminates costly components such as regulator valves, gas delivery manifolds, multiple ball lock mechanisms, and complex linkage systems. The simplified SMA-based actuator design reduces part count and eliminates the need for expensive precision-machined gas system components.
Solution Approach 2:
The patent substitutes the expensive conventional mechanical release system with a more cost-effective electrical-mechanical SMA system. The SMA actuators, while requiring electrical infrastructure, eliminate the need for costly gas system components and complex mechanical linkages, reducing overall manufacturing costs.
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 reduces weight and cost by eliminating the need for pressurized gas, simplifies maintenance, and integrates seamlessly with existing designs without impacting frangible rod functions, while avoiding complex regulator valves and secondary gas delivery systems.
Implementation Method 1
the first shape memory alloy spring is configured to bias the first spindle to retract into the first housing in response to being electrically energized
Implementation Method 2
A release system for an evacuation slide assembly of an aircraft is disclosed herein. The release system includes a blowout panel and a first actuator comprising a first housing, a first shape memory alloy spring
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A release system for an evacuation slide assembly of an aircraft includes a first actuator and in various embodiments a second actuator. The first actuator and the second actuator each comprise an SMA spring configured to be electrically energized for actuating the first and second actuators in response to an evacuation event. In various embodiments, the first actuator is configured to release a blowout panel (110) of the evacuation slide assembly in response to the first SMA spring being electrically energized. In various embodiments, the second actuator is configured to release a soft cover (120) of the evacuation slide assembly in response to the second SMA spring being electrically energized.