Propellant Curing Residual Stress Reduction via High-Energy Acoustic Beam
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Solution Overview
Problem
Current methods are inadequate for reducing residual stress in non-metallic propellants in a colloidal state, which can lead to cracks and fractures in aerospace equipment, posing safety risks.
Innovation Solution
A method involving the application of a high-energy acoustic beam during the curing process of propellant slurry to counteract stress formation, enhance mechanical properties, and compact particle structures, thereby reducing internal residual stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods (annealing, tempering, vibration shocking) are used to reduce residual stress, then residual stress in metallic materials can be reduced, but these methods are ineffective for non-metallic propellants in colloidal state and the devices are relatively complicated
Solution Approach 1:
The patent replaces complex mechanical vibration shocking devices with a high-energy acoustic beam system. The acoustic beam generator and transducer create high-frequency acoustic waves that penetrate the propellant slurry during curing, providing stress reduction through acoustic energy rather than mechanical vibration, thereby simplifying the device structure while maintaining effectiveness for non-metallic colloidal materials
Solution Approach 2:
The patent changes the physical state parameter consideration by applying high-energy acoustic beam during the curing process when propellant is in colloidal state. This timing parameter change allows the acoustic energy to affect the material during its transitional state, making the process effective for non-metallic propellants where conventional methods fail
2Reliability
If high-energy acoustic beam is applied during the whole curing process, then residual stress is reduced and mechanical properties are enhanced, but energy consumption increases
Solution Approach 1:
The high-energy acoustic beam is applied at the beginning of the curing process when the propellant slurry is still in a colloidal state and more responsive to acoustic energy. This preliminary action during the critical curing phase prevents residual stress formation from the outset, making the energy application more efficient and reducing total energy consumption compared to post-curing treatments
Solution Approach 2:
The acoustic beam is applied continuously throughout the curing process, ensuring consistent stress reduction and mechanical property enhancement. This continuous application prevents stress accumulation during the entire curing phase, achieving reliable propellant stability while optimizing energy utilization through uninterrupted beneficial action
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 reduces residual stress in propellants, improving mechanical properties and stability, ensuring the safety and reliability of aerospace equipment by continuously applying a high-energy acoustic beam sensitive to stress throughout the curing process.
Implementation Method 1
a high-energy acoustic beam generator and a high-energy acoustic beam transducer are actuated to continuously emit high-energy acoustic beam to the propellant slurry
Implementation Method 2
the high-energy acoustic beam with high-frequency and small-amplitude may make the particles of the propellant slurry more compact, improve leveling property of the surface of the propellant slurry and facilitate escaping of the air
Data Source
AI summary
The present disclosure is related to the technical field of propellant performance research, and in particular, to a method for reducing propellant curing residual stress by a high-energy acoustic beam. The method includes the following steps: injecting a propellant slurry into a curing container and waiting for the propellant slurry to start curing; actuating, when the propellant slurry starts curing, a high-energy acoustic beam generator and a high-energy acoustic beam transducer to continuously emit high-energy acoustic beam to the propellant slurry in the curing container until the propellant slurry is cured to form a propellant grain; and closing the high-energy acoustic beam generator and the high-energy acoustic beam transducer. The method for reducing propellant curing residual stress by high-energy acoustic beam provided in the present disclosure can reduce residual stress inside the propellant in an effective manner, thereby ensuring operation safety of the aerospace equipment.