Variable Camber Fluid-Dynamic Body Using Shape Memory Alloy Actuators
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Solution Overview
Problem
Current fluid-dynamic control surfaces in aeronautics lack the ability to dynamically adjust camber efficiently, which affects stall speed and aerodynamic performance, particularly in aircraft design where adaptive camber configurations are necessary for optimal flight conditions.
Innovation Solution
A variable camber fluid-dynamic body system utilizing shape memory alloy actuators that can change the camber configuration in response to temperature control, allowing the fluid-dynamic body to assume different angles and shapes for optimal aerodynamic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional electro/mechanical or hydraulic control systems are used to adjust camber, then reliable control can be achieved, but device complexity and weight increase
Solution Approach 1:
The patent replaces traditional electro/mechanical or hydraulic control systems with a shape memory alloy (SMA) based actuation system. The SMA actuators directly induce camber changes through thermal activation, eliminating the need for complex mechanical linkages, motors, or hydraulic mechanisms while maintaining reliable control of the airfoil camber configuration.
Solution Approach 2:
The invention changes the control parameter from electrical/hydraulic signals to temperature control. By heating or cooling the shape memory alloy actuators, the camber configuration is adjusted through phase transformation of the SMA material, providing a simpler and more direct control mechanism compared to traditional systems.
2Device complexity
If shape memory alloy actuators are used to change camber configuration, then device complexity is reduced, but response speed may be limited by thermal activation time
Solution Approach 1:
The patent employs periodic or cyclic thermal activation of the shape memory alloy actuators to achieve camber adjustments. By applying controlled heating cycles, the SMA material undergoes phase transformations that drive the camber change, allowing for repeated adjustments while managing the thermal response time of the material.
3Adaptability or versatility
If camber is changed to adapt to flight conditions, then aerodynamic performance is improved, but structural stress on the airfoil increases
Solution Approach 1:
The patent applies shape memory alloy actuators at specific locations on the airfoil structure where camber adjustment is most effective. By strategically positioning the SMA actuators, the system achieves adaptive camber changes with minimal structural stress, as the actuation force is applied locally rather than requiring global structural reinforcement.
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
Enables dynamic adjustment of camber configurations to enhance aerodynamic performance, improve stall speed characteristics, and adapt to various flight conditions without the need for electro/mechanical or hydraulic systems, thereby optimizing lift, drag, and noise characteristics.
Implementation Method 1
A variable camber fluid-dynamic body system utilizing shape memory alloy actuators that can change the camber configuration in response to temperature control
Data Source
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AI summary
A system and methods for configuring a fluid-dynamic body is disclosed. A camber (414) of a fluid-dynamic body (400) is configured by activating a shape memory alloy actuator coupled to the fluid-dynamic body.