Thermally Initiated Variable Venting for Rocket Motor Safety
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Solution Overview
Problem
Rocket motors are prone to ignition or explosion due to high temperatures, posing safety risks in enclosed spaces, as existing solutions fail to effectively mitigate these hazards.
Innovation Solution
A thermally initiated variable venting system comprising a first and second linear shape charge coupled with sensors, where the first sensor ignites the first LSC at a lower temperature and the second sensor ignites the second LSC at a higher temperature, generating a molten jet to cut a slot or trench in the rocket motor case, thereby venting pressure and preventing uncontrolled thrust.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rocket motor is subjected to high temperatures in enclosed spaces, then the fuel may ignite or explode causing destructive thrust, but existing safety solutions fail to effectively mitigate these hazards
Solution Approach 1:
The patent implements preliminary protective action by installing thermal sensors and linear shaped charges on the rocket motor case before operation. When sensors detect dangerous temperature levels, the shaped charges are activated to create venting slots in advance, preventing ignition and explosion before they can occur. This proactive approach addresses the reliability-safety contradiction by preparing defensive measures before the harmful thermal effects can manifest.
Solution Approach 2:
The patent converts the harmful thermal energy that could cause ignition into a beneficial protective mechanism. Thermal sensors detect the harmful heat, and this information triggers the linear shaped charges to create controlled venting paths. The harmful thermal effect is thus transformed into a useful signal that activates the safety system, resolving the contradiction between the presence of thermal hazards and the need for safety.
2Device complexity
If a single thermal sensor is used to detect temperature, then the system is simple, but it cannot distinguish between different temperature levels requiring different venting responses
Solution Approach 1:
The patent divides the single sensor function into multiple specialized thermal sensors, each configured to detect specific temperature thresholds. The first sensor detects lower temperature levels and triggers the first linear shaped charge, while the second sensor detects higher temperature levels and triggers the second linear shaped charge. This segmentation allows the system to provide differentiated responses to different thermal conditions, resolving the contradiction between simplicity and adaptability.
Solution Approach 2:
The patent implements a dynamic sensor system where multiple sensors with different thermal characteristics (fast response vs. slow response) are deployed to detect different temperature levels. This dynamic approach allows the system to adapt its response based on the severity and rate of temperature increase, enabling versatile temperature monitoring while maintaining reasonable system complexity through the use of off-the-shelf sensor components.
3Reliability
If linear shaped charges are positioned to cut through the entire motor case, then complete venting is achieved, but excessive material is removed and structural integrity is compromised
Solution Approach 1:
The patent applies partial action by positioning the linear shaped charges to create slots that extend only partially through the motor case wall thickness, rather than completely through. The first shaped charge creates a slot extending in a first direction, and the second shaped charge creates a slot extending in a second direction, with the combined effect providing sufficient venting capability while preserving most of the motor case structure. This resolves the contradiction between achieving effective venting and minimizing material loss.
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 effectively prevents rocket motor ignition and explosion by creating a controlled venting mechanism, reducing the risk of destructive thrust and damage in hazardous environments.
Implementation Method 1
the first LSC overlaps the second LSC, the first sensor is configured to activate to ignite the first LSC
Implementation Method 2
A thermally initiated variable venting system is disclosed, comprising a first linear shape charge (LSC) coupled to a first sensor
Implementation Method 3
the first sensor is configured to activate to ignite the first LSC in response to at least a portion of the first sensor reaching a first temperature
Data Source
AI summary
A thermally initiated variable venting system may comprise a first linear shape charge (LSC) coupled to a first sensor and a second LSC coupled to a second sensor. An upper apex of the second LSC may be disposed within a lower apex of the first LSC. The output of the system may vary depending on whether the event is fast cook-off (FCO) or slow cook-off (SCO).