Tandem Missile Charge Shock Wave Coupling
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Solution Overview
Problem
Modern explosive charges have high initiation thresholds that are not effectively coupled with shock waves from pre-shaped charges in tandem charges, leading to inefficient energy transfer and increased stress on components like safety devices and mechanical parts.
Innovation Solution
Incorporating an introduction element within the casing of the main charge that enhances the transmission of shock waves into the explosive charge, reducing back-transmission and energy retention in the shell, and using design features like flush contact, ventilation, and materials with optimized impedance to ensure effective shock wave coupling and damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If modern explosive charges with high initiation thresholds are used in the main charge, then the safety and stability of the explosive charge are improved, but the shock wave from the pre-shaped charge cannot effectively initiate the main charge
Solution Approach 1:
A copper insert is introduced as an intermediary component between the pre-shaped charge and the main explosive charge. The copper insert has optimized impedance properties that facilitate shock wave transmission from the pre-shaped charge through the casing into the main charge, effectively bridging the impedance mismatch and enabling reliable initiation of high-threshold explosives
Solution Approach 2:
The impedance parameters of the transmission path are modified by introducing copper material with specific acoustic impedance properties. This parameter change optimizes the shock wave transmission characteristics, allowing effective energy transfer from the pre-shaped charge to the main charge while maintaining safety standards
2Loss of energy
If the shock wave is coupled into the casing when the pre-shaped charge detonates, then the shock wave can be transmitted to the main charge, but the shock wave causes increased stress on safety devices and mechanical components
Solution Approach 1:
The copper insert serves as a mediator that preferentially channels shock wave energy into the explosive charge rather than allowing it to propagate through the casing structure. This directs the mechanical energy into the intended target (explosive charge) while protecting vulnerable components (safety devices, threads, ignition system)
Solution Approach 2:
The shock wave, which could be harmful to mechanical components, is converted into a beneficial initiation mechanism for the main charge. The copper insert transforms the potentially damaging shock wave into controlled energy transmission that reliably initiates the explosive charge while minimizing structural stress
3Reliability
If an introduction element is added to enhance shock wave transmission into the explosive charge, then the initiation reliability is improved, but the device complexity increases
Solution Approach 1:
The copper insert is nested within the existing casing structure, utilizing the available internal space of the main charge assembly. This nesting approach integrates the introduction element without requiring additional external components or significant structural modifications, thereby limiting the increase in device complexity
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
This solution increases the susceptibility of the explosive charge to shock waves, reducing the energy remaining in the shell and minimizing stress on other components, thereby enhancing the performance and reliability of the tandem charge.
Implementation Method 1
shock waves, which occur when the summons is detonated and are coupled into the casing
Implementation Method 2
The idea on which the present invention is based consists in introducing or dissipating a shock wave coupled into the casing in a targeted manner into the explosive charge... the transmission amplitude is increased
Implementation Method 3
the explosive charge has a certain amount of damping, which is why back-transmission into the shell is negligible
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The present invention provides a tandem charge (1) for a missile, comprising: a pre-charge (2), in particular a pre-charge, and a main charge (3), which has a casing (4) and an explosive charge (11) contained within the casing, wherein the casing has an induction element (12, 13, 14) on an inner side, which is designed to enhance the introduction of shock waves coupled into the casing during detonation of the pre-charge into the explosive charge.