Aircraft Fire Suppression Addressable Bottle Valve Control
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Solution Overview
Problem
Current aircraft fire suppression systems face challenges in efficiently managing fire suppression agents due to leakage, oxygen replenishment during descent, and the environmental impact of carrying inert gases, leading to weight and fuel penalties, as well as wastage of agents.
Innovation Solution
A fire suppression system with temperature and pressure sensors on bottles, an addressable valve, and a control unit that analyzes data to determine the adequacy of fire suppression agent content and independently controls the release, optimizing the use of inert gases like argon and nitrogen by selecting the appropriate bottles and regulating discharge rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large quantity of fire suppression agent is discharged into the enclosure to initially suppress the fire, then the fire is effectively extinguished, but the agent leaks out through ventilation systems and oxygen replenishment during descent causes the fire to potentially restart
Solution Approach 1:
The system performs preliminary action by continuously monitoring bottle pressure and temperature to predict remaining agent quantity before discharge. This allows the control unit to plan discharge strategies that maximize agent utilization and minimize waste from leaking and oxygen replenishment effects.
Solution Approach 2:
The system dynamically adjusts discharge rates based on real-time conditions. The control unit modulates the discharge to provide initial high-rate suppression followed by lower-rate maintenance discharge, adapting to changing oxygen levels and agent loss rates throughout the flight profile.
2Object-affected harmful factors
If inert gas fire suppression agents are used to replace halon, then environmental impact is reduced, but a substantially greater volume and weight must be carried to achieve the same suppressing capability
Solution Approach 1:
The system uses feedback from pressure and temperature sensors to continuously monitor actual agent quantity in bottles. This feedback enables the control unit to optimize discharge rates and select the minimum necessary agent quantity from multiple bottles, reducing the total weight of agent that must be carried while maintaining effective fire suppression.
Solution Approach 2:
The system changes operational parameters by monitoring bottle conditions and adjusting discharge rates dynamically. This allows more precise control over agent delivery, ensuring that the minimum necessary weight of inert gas is carried and discharged effectively without excessive waste.
3Reliability
If a new bottle is opened for each fire to ensure sufficient agent supply, then adequate suppression capability is maintained, but wastage increases and more bottles must be carried resulting in weight and fuel penalty
Solution Approach 1:
The control unit uses feedback from continuous monitoring of pressure and temperature in all bottles to determine the actual remaining agent quantity. This feedback enables intelligent selection of bottles with sufficient remaining agent, allowing the system to use partially full bottles instead of always opening new ones, thereby reducing total agent weight carried and minimizing wastage.
Solution Approach 2:
The system performs self-service by automatically monitoring its own agent supply status and making intelligent decisions about bottle selection and discharge rates. This self-monitoring and self-management capability ensures adequate suppression capability while optimizing agent utilization to reduce total weight carried.
4Reliability
If the proportion of oxygen in the protected enclosure is reduced below a certain level during descent, then fire suppression is achieved, but the proportion slowly increases again over time undoing the work and potentially causing fire to restart
Solution Approach 1:
The system dynamically adjusts the discharge rate based on real-time monitoring and predicted oxygen levels. After initial fire suppression, the control unit modulates discharge to provide a lower-rate maintenance discharge that compensates for oxygen infiltration and descent-related pressure changes, maintaining suppression stability throughout the extended duration of the flight.
Solution Approach 2:
The system performs preliminary calculation of expected oxygen replenishment rates based on flight profile and enclosure characteristics. This allows the control unit to pre-plan maintenance discharge strategies that proactively counteract anticipated oxygen increases, maintaining suppression stability without excessive agent consumption.
Data Source
AI summary
A fire suppression system for a plurality of enclosures in an aircraft comprises a plurality of bottles containing fire suppression agent, a temperature sensor and a pressure sensor on each bottle for measuring temperature and pressure data of the bottle contents, an addressable bottle valve on each bottle and a control unit. The control unit is configured to analyze the temperature and pressure data for each bottle to determine adequacy of fire suppression agent content for extinguishing a fire in a particular enclosure of the aircraft. The control unit is further configured to control the bottle valves independently by using the bottle valves' addresses, in order to manage the release of fire suppression agent.