Shape Memory Alloy Release Apparatus for Simultaneous Deployment
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Solution Overview
Problem
Existing systems, such as spacecraft and satellite systems, face challenges in simultaneously releasing opposing elements without imparting unpredictable loads, especially when using separate electrical or electromechanical devices over varying conditions and operating voltages.
Innovation Solution
A shape-memory alloy-triggered release apparatus with a base member and channel, featuring two rods with coupling devices that rotate to generate a linear force, enabling simultaneous release of deployable components, utilizing energy stored in springs and a differential screw mechanism for controlled release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate electrical or electromechanical devices are used to release opposing elements, then the release can be controlled, but it is challenging to obtain simultaneous release especially over a range of conditions and potential operating voltages
Solution Approach 1:
The patent combines two separate release functions into a single integrated mechanism. The first and second rods share a common channel and are both actuated by the same shape memory alloy wire, merging the control functions into one unified device that inherently ensures simultaneous release without requiring separate control systems.
Solution Approach 2:
The shape memory alloy wire acts as an intermediary that converts electrical activation into mechanical motion that simultaneously actuates both rods. This intermediary mechanism translates a single control signal into coordinated movement of both release elements, ensuring simultaneity while simplifying the control architecture.
2Ease of operation
If separate devices are used for releasing opposing elements, then individual control is possible, but unpredictable loads are imparted to the deployable elements
Solution Approach 1:
By merging the control of both rods into a single actuation system, the patent ensures that both opposing elements are released simultaneously with equal and opposite forces. This eliminates unpredictable loads on deployable elements while maintaining individual control capability through the shared actuation mechanism.
3Reliability
If a single mechanical bridging element is used, then simultaneous release is achieved, but the mechanism complexity increases with springs and differential screw
Solution Approach 1:
The springs provide self-service by automatically storing and releasing energy to return the rods to their initial positions after actuation. The differential screw mechanism self-regulates the motion of the two rods, ensuring they move simultaneously and equally without requiring external control systems, thereby achieving reliable simultaneous release while keeping the control architecture simple.
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
Facilitates simultaneous and controlled release of deployable components, reducing unpredictable loads and ensuring reliable operation across a range of conditions and voltages with a single mechanical bridging element.
Implementation Method 1
the channel includes a shape memory alloy wire configured to transform electrical energy to thermal energy
Implementation Method 2
the channel includes a shape memory alloy wire configured to transform electrical energy to thermal energy and undergo a phase change
Data Source
AI summary
A release apparatus includes a base member and a channel having a first portion and a second portion. A first rod positioned within the first portion includes a first end portion having a first coupling device and a second end portion coupled to a first portion of a panel assembly. A second rod positioned within the channel's second portion includes a first end portion having a second coupling device such that the second coupling device is positioned proximate to the first coupling device. The second rod includes a second end portion coupled to a second portion of the panel assembly. First and second coupling devices rotate such that a linear force is generated between the first and second rods, enabling the first rod second end portion and the second rod second end portion to simultaneously release the first and second portions of the panel assembly, respectively.