Shape Memory Alloy Lumbar Support for Lightweight Aircraft Seats
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Solution Overview
Problem
Conventional aircraft lumbar support systems are heavy, costly to maintain, and lack automatic adjustment capabilities to accommodate user preferences, relying on manual actuation mechanisms and multiple components that increase weight and complexity.
Innovation Solution
A shape memory alloy lumbar support system with a deformable basket and a controller that uses a shape memory alloy tension cable to adjust the lumbar support based on user profiles, allowing for electric current-controlled deformation to provide tailored support without the need for manual actuation or heavy mechanical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional lumbar support systems use multiple mechanical components including rack and pinion mechanisms, then the lumbar support can achieve different profiles, but the weight of the seat increases
Solution Approach 1:
The patent replaces the conventional mechanical rack and pinion system with a shape memory alloy (SMA) actuator that uses electrical current to directly adjust the lumbar support profile. The SMA cable or wire changes its physical properties (length, stiffness) when electrical current is applied, eliminating the need for complex mechanical transmission components and significantly reducing the overall weight of the lumbar support system.
Solution Approach 2:
The patent utilizes the ability of shape memory alloy to change its physical parameters (length, stiffness, tension) in response to electrical current input. By controlling the electrical current magnitude and duration, the system can achieve different lumbar support profiles by directly altering the SMA actuator's physical state, thereby providing profile adjustment without mechanical complexity.
2Ease of operation
If conventional lumbar support systems include multiple components such as actuation knobs, cables, and mechanical linkages, then the lumbar support can be adjusted, but the maintenance cost increases
Solution Approach 1:
The patent replaces multiple mechanical components (actuation knobs, cables, linkages) with an electrical actuation system using shape memory alloy. This substitution reduces the number of moving parts and mechanical connection points that are prone to wear, failure, and maintenance requirements, thereby lowering maintenance costs while preserving adjustment functionality.
Solution Approach 2:
The shape memory alloy actuator serves multiple functions simultaneously: it acts as the actuation mechanism, the tensioning element, and the positioning component. This multi-functionality eliminates the need for separate mechanical components that would each require maintenance, simplifying the overall system and reducing maintenance requirements.
3Device complexity
If conventional lumbar support systems use manual actuation mechanisms, then the system structure is simple, but the system lacks automatic adjustment capability
Solution Approach 1:
The patent replaces manual mechanical actuation with an electrical actuation system using shape memory alloy that can be controlled by electrical current. This substitution adds automatic adjustment capability through electrical control while maintaining relatively simple system structure, as the SMA actuator is a single-component solution that eliminates complex mechanical transmission systems.
Solution Approach 2:
The shape memory alloy actuator can be integrated with sensors and control systems to automatically detect user preferences and adjust the lumbar support profile without manual intervention. The system can remember and reproduce preferred settings, providing automatic adjustment capability while keeping the overall structure relatively 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
The system reduces weight and maintenance costs while enabling automatic adjustment to user preferences, providing effective lumbar support with reduced complexity and increased user comfort.
Implementation Method 1
a shape memory alloy tension cable in communication with the proximate end of the deformable lumbar support basket, and in communication with the distal end of the deformable lumbar support basket. The shape memory alloy tension cable has a changeable tension length when an electric current is transmitted through the cable
Data Source
AI summary
A lumbar support system for an aircraft seat includes a deformable lumbar support basket having a proximate end and a distal end. The system includes a shape memory alloy tension cable in communication with the proximate end of the deformable lumbar support basket, and the distal end of the deformable lumbar support basket. The shape memory alloy tension cable has a changeable tension length with an electric current through the cable. The system also includes a controller operatively connected with the shape memory alloy tension cable. The controller transmits the electric current through the shape memory alloy tension cable based on the user actuation. The electric current causes the shape memory alloy tension cable to deform the lumbar support basket by tension force applied to the proximate end of the deformable lumbar support basket and the distal end of the deformable lumbar support basket.