Deflector Strip for Link Wire Protection in Guided Projectiles
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Solution Overview
Problem
The existing techniques for guiding self-propelled projectiles using a link wire are prone to damage due to incomplete combustion of the main engine's propulsive jet, where particles are not fully ejected outside the projectile's boundary, leading to interactions with the link wire and potential breakage.
Innovation Solution
A device comprising a deflector strip and actuation module that can pivot from a folded to an unfolded position to deflect the propulsive jet's particles, preventing them from interacting with the link wire, featuring a retaining element to maintain the deflector strip in a retracted position during launch and a return element to deploy it when the retaining element is destroyed by the propulsive jet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the main engine produces a propulsive jet to drive the projectile, then the projectile gains propulsion, but particles from incomplete combustion are not fully ejected outside the limit layer and interact with the link wire, causing damage
Solution Approach 1:
The harmful particles are extracted from the harmful zone by deflecting them away from the link wire using the deflector strip. The deflector strip actively removes particles from the scanning zone where the link wire operates, preventing contact and damage while maintaining engine propulsion.
Solution Approach 2:
The deflector strip acts as an intermediary element between the propulsive jet and the link wire. It intercepts particles before they can reach the link wire, serving as a protective barrier that manages the interaction between the engine exhaust and the guidance system.
2Reliability
If a deflector strip is added to deflect particles, then link wire protection is improved, but device complexity increases
Solution Approach 1:
The deflector strip is made dynamic rather than static, capable of moving between a retracted position (during launch) and a deployed position (during flight). This dynamic configuration allows the system to protect the link wire when needed while minimizing interference with launch operations, balancing reliability and operational requirements.
Solution Approach 2:
The deflector strip is positioned and configured in advance to be ready for particle deflection. The actuation mechanism is pre-installed with the retaining element in place, so that when the retaining element is destroyed by the propulsive jet, the deflector strip automatically deploys to protect the link wire from incoming particles.
3Object-affected harmful factors
If the deflector strip is kept in unfolded position to deflect particles, then particle deflection is effective, but the deflector strip interferes with launch tube during projectile launch
Solution Approach 1:
The deflector strip transitions from a static to a dynamic component, moving between retracted and deployed states. During launch, it remains retracted to clear the launch tube path, ensuring smooth projectile ejection. After launch, it deploys to deflect particles away from the link wire, resolving the conflict between launch clearance and particle protection.
Solution Approach 2:
The deflector strip operates in periodic cycles: retracted during launch phase, then deployed during flight phase. This periodic action allows the system to fulfill different functional requirements at different times - clearance during launch and protection during flight - without compromising either function.
4Strength
If the retaining element is made strong to maintain deflector strip position, then deflector stability is improved, but the propulsive jet cannot destroy it to activate the return element
Solution Approach 1:
The retaining element has differentiated local properties - it is strong enough to maintain the deflector strip in the retracted position during storage and launch preparation, but contains a specific portion that is vulnerable to destruction by the propulsive jet. This local quality differentiation allows the system to maintain stability when needed while enabling activation when required.
Solution Approach 2:
The retaining element's structural integrity parameter changes from intact to destroyed due to exposure to the propulsive jet. This parameter change triggers the transition from the retained state to the deployed state, allowing the system to adapt from a stable, retracted configuration to an active, particle-deflecting configuration.
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
Effectively prevents link wire damage by deflecting particles away from the wire, ensuring the projectile's safe flight and operation without interference from the propulsive jet.
Implementation Method 1
a return element configured to exert a first force capable of bringing the deflector strip from the folded position to the unfolded position
Implementation Method 2
when the propulsive jet destroys at least one portion of the retaining element
Implementation Method 3
a deflector strip downstream of the ejection outlet... to deflect the stream of particles
Data Source
AI summary
A device is configured for deflecting a stream of particles for a projectile guided by a link wire, the projectile having a fuselage and an engine capable of producing a propulsive jet containing the stream of particles. The device includes a device support including an inner surface configured to attach the device support to the fuselage of the projectile, and a deflector strip assuming at least an unfolded position in which the deflector strip forms an angle with the device support in order to deflect the stream of particles.