Pyrotechnic Shock Table Frequency Control via Damping Washers
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Solution Overview
Problem
Existing pyrotechnic shock tables fail to adequately cover the entire frequency spectrum, leading to overqualification of equipment during testing and rapid wear due to high-frequency signal generation and explosive-induced deformation, respectively.
Innovation Solution
A shock table design featuring a circular explosive support washer and damping washers between plates, with a point explosive charge at the center, providing rotational symmetry and damping to control frequency ranges and reduce wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pyrotechnic means are used to simulate near-field shocks, then high-frequency shock simulation is achieved, but the frequency spectrum coverage is insufficient and low-frequency shocks cannot be adequately simulated
Solution Approach 1:
The patent employs a dual-plate system where the lower plate is rigidly connected to the support structure while the upper plate is elastically connected via springs and dampers. This dynamic configuration allows the system to respond differently across frequency ranges: the rigid lower plate generates high-frequency shocks through pyrotechnic activation, while the elastic connections enable low-frequency oscillations, thereby achieving comprehensive frequency spectrum coverage with a single pyrotechnic test system.
Solution Approach 2:
The patent introduces intermediate elastic elements (springs and dampers) between the lower and upper plates. These intermediaries serve as mediators that transmit and modify the shock signals: they allow high-frequency impulses from the pyrotechnic charge to pass through to the upper plate while simultaneously enabling low-frequency oscillatory motion, thus bridging the gap between high-frequency generation and low-frequency transmission.
2Force
If explosive charge is increased to enhance low-frequency shock, then low-frequency acceleration is improved, but high-frequency shock increases excessively causing overqualification
Solution Approach 1:
The patent applies local quality differentiation through the dual-plate design with distinct connection characteristics. The lower plate maintains rigid connections for stable high-frequency generation, while the upper plate employs elastic connections that selectively filter and transmit frequencies. This allows the system to locally optimize force transmission: enhancing low-frequency acceleration through elastic oscillations while simultaneously dampening excessive high-frequency components, preventing overqualification of test specimens.
Solution Approach 2:
The patent utilizes parameter changes in the elastic connection elements (springs and dampers) to control frequency transmission. By adjusting the stiffness and damping coefficients of these elements, the system can modify its frequency response characteristics: allowing low-frequency oscillations to amplify the desired acceleration while automatically attenuating high-frequency components, thus achieving the desired force enhancement without harmful side effects.
3Stability of the object's composition
If rigid connection between plates is used, then structural stability is improved, but vibration amplification occurs at certain frequencies
Solution Approach 1:
The patent transitions from a static rigid connection to a dynamic elastic connection system. The springs and dampers create a dynamically stable structure that can adapt its stiffness characteristics based on excitation frequency. This dynamic stability prevents rigid connection-induced vibration amplification while maintaining overall structural integrity, ensuring reliable and accurate test results across the frequency spectrum.
Solution Approach 2:
The patent converts the potentially harmful effect of rigid connections (vibration amplification at resonant frequencies) into a beneficial feature. By using elastic connections with carefully selected stiffness and damping parameters, the system transforms what would be resonant amplification problems into controlled frequency-selective transmission characteristics, where the elastic elements naturally filter unwanted frequencies while transmitting desired shock signals.
4Power
If pyrotechnic simulation is used for near-field shocks, then high-frequency shock generation is achieved, but rapid wear of the plate occurs due to hot gases and deformation
Solution Approach 1:
The patent introduces an intermediate elastic connection system between the pyrotechnic charge and the upper plate. This intermediary layer acts as a buffer that protects the upper plate from direct exposure to hot explosive gases and mechanical deformation. The elastic elements can withstand the high-energy pyrotechnic event while maintaining their structural integrity, thereby extending the lifespan of the plate and reducing wear without compromising shock generation capability.
Solution Approach 2:
The patent segments the shock transmission path into distinct functional zones: the lower plate serves as the pyrotechnic activation interface, the elastic connections (springs and dampers) serve as the protective intermediary zone, and the upper plate serves as the test specimen mounting interface. This segmentation allows each component to be optimized for its specific function, with the intermediate elastic zone absorbing the wear and thermal exposure from pyrotechnic operations while protecting the upper plate.
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 design allows for a more balanced simulation of shock frequencies, reducing overqualification and extending the lifespan of the equipment by effectively damping high frequencies and increasing low-frequency accelerations without excessive high-frequency shocks.
Implementation Method 1
the detonation of the latter induces intense vibrations which propagate throughout the space vehicle in the form of a shock wave and a vibratory field
Implementation Method 2
the detonation of the latter induces intense vibrations which propagate throughout the space vehicle
Implementation Method 3
damping washers between plates, with a point explosive charge at the center, providing rotational symmetry and damping to control frequency ranges
Data Source
Figure 1~3
Figure 4~5
Figure 6~7
AI summary
The shock table comprises at least one plate (2, 8), an item of equipment to be tested (12) being fixed on the plate (8) and an explosive charge being fixed under the plate (2). A circular explosive support washer (16) is inserted between the plate (2) and the explosive charge (16).