Missile Nose Ejection Actuator with Thermal Insulation
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Solution Overview
Problem
Existing actuation devices for missile nose ejection, such as pyrotechnic ejector bolts, are compromised by high temperatures and mechanical stresses, risking degradation and unintentional triggering, and can damage sensors with powder residues and blast effects.
Innovation Solution
A pyrotechnic actuation device with thermal insulation elements and retaining rods, where the pyrotechnic charge is insulated from thermal flows and only secured to the removable part, ensuring mechanical stability and minimizing mass and volume, with retaining rods breaking to avoid debris and allowing rapid ejection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a pyrotechnic ejector bolt is used to generate ejection force, then the nose can be separated in very short time, but the high temperatures risk degrading the pyrotechnic actuator and may cause unintentional triggering
Solution Approach 1:
A thermal insulation element is introduced as an intermediary between the hot nose and the pyrotechnic actuator. This mediator protects the actuator from thermal effects while allowing the pyrotechnic charge to function normally for rapid ejection.
Solution Approach 2:
The actuation device is segmented into distinct functional components: the pyrotechnic actuator for force generation, the thermal insulation element for thermal protection, and the retaining rod for mechanical connection. This segmentation allows each component to optimize its specific function.
2Productivity
If a pyrotechnic ejector bolt is used to generate ejection force, then the nose can be separated in very short time, but the blast effect and powder residues may damage the sensor
Solution Approach 1:
The pyrotechnic actuator is extracted and positioned away from the sensor, with the thermal insulation element further isolating it. This extraction removes the harmful blast and powder effects from the sensor vicinity while preserving the rapid ejection capability.
Solution Approach 2:
The thermal insulation element serves as a mediator that blocks harmful pyrotechnic byproducts (powder residues and blast effects) from reaching the sensor, while still allowing the mechanical ejection function to proceed.
3Reliability
If thermal insulation elements are added to protect the pyrotechnic actuator, then the actuator reliability improves, but the mass and volume of the actuation device increase
Solution Approach 1:
Thermal insulation is applied locally only where needed - between the hot nose and the pyrotechnic actuator - rather than throughout the entire actuation device. This localized approach provides necessary protection while minimizing added mass and volume.
4Stability of the object's composition
If the pyrotechnic actuator is secured to both the missile body and the removable part, then mechanical stability is improved, but the complexity of the actuation device increases
Solution Approach 1:
The retaining rod function is extracted as a separate component from the pyrotechnic actuator itself. This allows the actuator to be simpler while the retaining rod provides the necessary mechanical connection and stability during flight.
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 reliable and efficient ejection mechanism that withstands high temperatures and mechanical stresses, preventing actuator degradation and sensor damage, while minimizing the actuation device's mass and volume, ensuring the missile's performance and sensor functionality.
Implementation Method 1
a pyrotechnic actuator comprising an activatable pyrotechnic charge able to generate an overpressure and a piston configured to be moved in a longitudinal direction under the effect of the overpressure
Implementation Method 2
activatable pyrotechnic charge able to generate an overpressure
Implementation Method 3
at least one thermal insulation element arranged so as to thermally insulate at least the pyrotechnic charge
Implementation Method 4
the pyrotechnic actuator is configured to be able to generate a force able to break said at least one retaining rod
Data Source
AI summary
An actuation device for ejecting a removable part of a missile includes a pyrotechnic actuator having a pyrotechnic charge configured to generate an overpressure and a piston configured to act on the removable part of the missile, at least one retaining rod, and at least one thermal insulation element configured to thermally insulate at least the pyrotechnic charge. The pyrotechnic actuator is configured to break the retaining rod.