Shape-Memory Throttle Valve for Stable Aircraft Slide Inflation
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Solution Overview
Problem
Conventional aircraft evacuation slide inflation systems face inefficiencies in gas flow regulation, leading to inconsistent inflation and potential safety hazards due to the lack of precise control over gas flow rates as the pressure in the gas canister depletes.
Innovation Solution
A throttle mechanism utilizing shape memory alloy wires and a flexible elastomer sheath that adjusts internal diameters in response to temperature changes, coupled with a valve system that includes a vent port and actuator plunger to manage gas flow, ensuring a steady flow rate and pressure throughout the inflation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pressure regulating valves are used in aircraft evacuation slide inflation systems, then the system structure is simple, but the gas flow rate becomes inconsistent as canister pressure depletes, compromising safety
Solution Approach 1:
The valve system dynamically adjusts the throttle opening position based on real-time pressure feedback from the canister. As pressure depletes, the system modifies the flow characteristics to maintain consistent gas flow rate, transforming a static valve into an adaptive control system that ensures reliable inflation throughout the entire pressure range
Solution Approach 2:
The system incorporates pressure feedback mechanisms that monitor canister pressure levels and use this information to regulate gas flow. The feedback loop enables the valve to compensate for pressure changes, maintaining consistent flow rates by adjusting opening positions or flow restrictions based on actual pressure conditions
2Speed
If high pressure gas is released directly without regulation, then the inflation speed is fast, but the flow rate is uncontrolled and inconsistent, creating safety hazards
Solution Approach 1:
The throttle mechanism dynamically adjusts its opening position to optimize the balance between inflation speed and flow control. The valve transitions from a fully open position for rapid initial inflation to progressively restricted positions as pressure increases, maintaining optimal flow rates throughout the inflation process while preserving speed
Solution Approach 2:
The system changes the flow parameters (opening position, flow area) based on real-time pressure conditions. By dynamically modifying these parameters, the valve maintains consistent flow rates across varying pressure conditions, ensuring both rapid inflation and controlled, safe gas delivery
3Reliability
If the valve opening position is fixed, then the device is simple to manufacture, but the gas flow rate varies with pressure changes, reducing inflation consistency
Solution Approach 1:
The valve system replaces fixed openings with dynamic adjustment mechanisms that modify the effective opening position based on pressure feedback. This transformation from static to dynamic control enables consistent inflation by adapting to pressure changes, while the adjustment mechanism is designed to be manufacturable through standard aerospace valve fabrication processes
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 solution provides a consistent and controlled gas flow to the evacuation slide, maintaining inflation even as the gas canister pressure decreases, enhancing safety and efficiency in emergency evacuations by reducing fluid friction and maintaining flow rates.
Implementation Method 1
a plurality of sets of shape memory alloy wires, extending between the upstream flange and the downstream flange and that are circumferentially aligned about the upstream flange and the downstream flange and are exterior to the flexible sheath
Data Source
AI summary
Disclosed is a throttle including: an upstream and downstream flanges; a flexible sheath that extends therebetween; a plurality of sets of shape memory alloy wires, extending between the flanges, that are (i) circumferentially aligned about the flanges; and (ii) exterior to the flexible sheath; and (iii) configured to contact an outer boundary of the flexible sheath, wherein: a first set of the plurality of sets of shape memory alloy wires form a first profile when exposed to a first temperature, causing the flexible sheath to form the first profile having a first internal diameter; and a second set of the plurality of sets of shape memory alloy wires form a second profile when exposed to a second temperature that is lower than the first temperature, causing the flexible sheath to form the second profile having a second internal diameter that is smaller than the first internal diameter.