High-Impulse Fuze Booster Waveshaper and Flyer Plate
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Solution Overview
Problem
Conventional booster designs fail to reliably initiate low-sensitivity explosives due to shock quenching and gaps between the fuze booster and explosive fill, leading to reduced reliability and increased likelihood of duds, especially under dynamic impact conditions.
Innovation Solution
A high-impulse fuze booster system incorporating a waveshaper and a flyer plate to control and direct the detonation wave, transforming it into a planar wave that maintains contact with multiple surfaces of the low-sensitivity explosive charge, ensuring consistent and reliable initiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lightweight metal can booster designs are used, then the device complexity is reduced and ease of manufacture is improved, but the reliability of initiation deteriorates due to shock quenching and gaps between the fuze booster and explosive fill
Solution Approach 1:
The booster assembly is segmented into distinct functional components: a shock-resistant booster body, a separately positioned flyer plate, and a waveshaper element. This segmentation allows each component to be optimized for its specific function while maintaining overall reliability without excessive complexity
Solution Approach 2:
The flyer plate serves as an intermediary element between the booster and the explosive fill. It transmits the shock wave from the booster to the explosive while maintaining reliable contact, solving the gap problem without requiring the booster itself to be complex or heavily modified
2Length of stationary object
If a reduced size plug is placed in the warhead to minimize the gap, then the gap between fuze, booster and explosive fill is reduced, but the explosive fill forward slosh during terminal impact cannot be eliminated and shrinkage cannot be accurately predicted
Solution Approach 1:
The flyer plate is pre-positioned and secured to the booster assembly before loading into the warhead. This preliminary action ensures that the gap-minimizing geometry is established in advance, eliminating the need for post-curing adjustments and ensuring reliable contact regardless of explosive shrinkage variations
Solution Approach 2:
The design changes the geometric parameters of the booster assembly by incorporating a specifically shaped flyer plate with optimized dimensions and orientation. This parameter change allows the system to maintain minimal gap under various conditions without requiring precise prediction of explosive shrinkage
3Productivity
If the explosive fill column height is increased to meet payload requirements, then the productivity and performance of the munition is improved, but the explosive deforms plastically during terminal impact increasing the booster gap
Solution Approach 1:
The flyer plate acts as a counteracting element that compensates for the plastic deformation of the explosive fill during impact. By maintaining its rigid structure and proper positioning, it counterbalances the gap-increasing effect of explosive flow, ensuring continuous contact is maintained despite increased column height
4Reliability
If conventional booster designs are used without waveshaper, then the device complexity is reduced, but the shock front is not delivered with uniformity resulting in low reliability
Solution Approach 1:
The waveshaper serves as an intermediary optical-mechanical element that modifies the detonation wave geometry. It transforms the spherical shock front into a planar wave, providing uniform shock delivery to the explosive fill without requiring complex electronic or mechanical control systems
Solution Approach 2:
The waveshaper utilizes its curved or angled surfaces to redirect the spherical detonation wave into a planar configuration. This geometric transformation of the wave front curvature achieves uniform shock delivery while adding minimal structural complexity to the booster assembly
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 achieves reliable initiation of low-sensitivity explosives by maintaining a planar contact with multiple surfaces of the explosive charge, reducing the risk of duds and enhancing the consistency of detonation across varying terminal conditions.
Implementation Method 1
a waveshaper and a flyer plate to control and direct the explosive train to detonate an insensitive munition
Implementation Method 2
Prompt initiation of the insensitive munition explosive formulation requires a pressure front of sufficiently high magnitude and lengthy time period
Data Source
Figure 1
Figure 2
Figure 3A~3C
AI summary
A method for initiating a low-sensitivity explosive charge includes initiating a booster explosive charge within an explosive charge cavity in a booster housing, and generating a planar detonation wave. Generating the planar detonation wave includes directing a detonation wave through the booster housing along a first waveshaper surface of a detonation waveshaper. The detonation wave is directed around the first waveshaper surface toward a second tapered waveshaper surface. After progressing around the first waveshaper surface, the detonation wave is directed along the second tapered waveshaper surface. The detonation wave changes into a planar detonation wave as the detonation wave moves along the second tapered waveshaper surface, the planar detonation wave includes a planar wave front. The planar detonation wave strikes a flyer plate coupled over the explosive charge cavity of the booster housing, and the planar wave front makes planar contact along an inner face of the flyer plate.