Sliding Ignition Device for Penetrator Initiation Reliability
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Solution Overview
Problem
High-strength and thick structures require fast and slender penetrators with a corresponding explosive charge and insert, but the high negative acceleration during perforation causes the explosive charge to move towards the penetrator tip, potentially creating a gap between the booster charge and ignition device, leading to unreliable initiation.
Innovation Solution
The ignition device and its surrounding jacket slide within the penetrator's envelope, maintaining operative connection with the explosive charge, ensuring initiation occurs within the charge and preventing cavity formation, with an elastic compensating device for thermal stability and decoupling from high-frequency acceleration loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the penetrator uses a slender design with high explosive charge for penetrating thick structures, then the penetration capability is improved, but the explosive charge moves toward the penetrator tip during high negative acceleration, creating a gap between the booster charge and explosive charge
Solution Approach 1:
The ignition device is made movable within the envelope rather than fixed, allowing it to dynamically adjust its position in response to the penetrator's acceleration forces. The device slides along the longitudinal axis within the envelope, maintaining contact with the explosive charge regardless of its position during penetration, thus ensuring reliable initiation while preserving the slender penetrator design for high penetration capability.
2Device complexity
If the ignition device is fixed at the rear of the penetrator, then the structure is simple, but the gap between the booster charge and explosive charge increases during penetration, risking failed initiation
Solution Approach 1:
The ignition device is designed to slide freely within the envelope along the longitudinal axis, transforming from a static fixed structure to a dynamic movable one. This allows the ignition device to automatically track the position of the explosive charge during penetration, maintaining operative connection without requiring complex active control mechanisms, thus balancing simplicity with reliability.
3Speed
If the penetrator experiences high negative acceleration during perforation, then the penetration speed is high, but the explosive charge displaces toward the tip, creating cavity formation and reducing initiation reliability
Solution Approach 1:
The envelope serves as an intermediary space that accommodates the movement of both the explosive charge and the ignition device. By providing a confined yet flexible environment within the penetrator, the envelope allows the ignition device to slide and maintain contact with the explosive charge regardless of displacement caused by high negative acceleration, thus preserving initiation reliability during high-speed penetration.
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
Guarantees reliable initiation of the explosive charge by maintaining contact between the ignition device and explosive charge during penetration, preventing cavity formation and ensuring consistent performance despite deceleration and thermal fluctuations.
Implementation Method 1
a jacket which, by means of at least part of its outer surface, is slidably abutted against the inside of the envelope
Implementation Method 2
an elastic compensating device for thermal stability and decoupling from high-frequency acceleration loads
Data Source
Figure 1
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AI summary
The device has an insert (8) fixed in an inner side of a casing (1) of a penetrator, where the device is arranged at a rear plate (10) of the penetrator by an elastic compensator (9) and acts together with a reinforcement charge (6). A shell (4) partially surrounds the device and lies at the inner side of the casing in a sliding manner by a part of an outer surface of the shell, where the shell lies directly at an explosive charge (3) by another part of the outer surface. The shell has an inner shell part and a sliding layer (7) partially surrounding the inner shell part.