Solid-Propellant Rocket Engine Adhesion Testing via Thrust Device
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Solution Overview
Problem
The existing methods for testing solid-propellant rocket engines are cumbersome, risky, and costly due to the need to overturn heavy engines to simulate tensile stress conditions, which is a slow and complex operation.
Innovation Solution
A test method that uses a thrust device with a pressurizable chamber and flexible membrane to simulate tensile stress on the thermal protection of the rocket engine, allowing for adhesion checks without overturning the engine by generating axial thrust to move a stress relief flap, enabling adhesion verification in the anti-flight configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the engine is overturned to simulate tensile stress on the thermal protection, then the adhesion between propellant and thermal protection can be checked, but the operation becomes slow, complex, and risky
Solution Approach 1:
A thrust device is introduced as an intermediary element between the propellant mass and the thermal protection. This device includes a pressurizable chamber with a flexible membrane that applies controlled thrust to the stress relief flap, simulating tensile stress without requiring engine overturning. The thrust device mediates the stress application function, eliminating the need for complex overturning equipment while maintaining reliable adhesion verification.
Solution Approach 2:
The mechanical overturning operation is replaced by a pressurization system. Instead of physically rotating the heavy engine using mechanical equipment, the invention uses pneumatic or hydraulic pressurization of a chamber to generate thrust forces. This substitution replaces complex mechanical overturning systems with simpler pressurization equipment, reducing device complexity and operational risk.
2Reliability
If the engine is overturned to check adhesion at both ends, then complete inspection is achieved, but the testing time increases significantly
Solution Approach 1:
The thrust device is pre-installed within the engine structure before testing, with the pressurizable chamber and flexible membrane positioned to contact the stress relief flap. This preliminary setup eliminates the need for time-consuming reconfiguration or engine repositioning during testing. The system is ready to apply tensile stress immediately, allowing rapid inspection of both ends without overturning operations.
Solution Approach 2:
The thrust device serves as a mediator that enables adhesion checking at both ends simultaneously or sequentially without requiring physical repositioning. By controlling pressurization, the same device can apply tensile stress to different sections of the thermal protection, eliminating the time lost in overturning operations while maintaining complete inspection coverage.
3Reliability
If heavy overturning equipment is used to rotate the casing, then tensile stress testing is possible, but safety risks increase
Solution Approach 1:
The dangerous mechanical overturning operation is replaced by controlled pressurization of a chamber. The thrust device uses pneumatic or hydraulic pressure to generate the necessary forces, eliminating the need for heavy mechanical equipment that poses safety risks. The pressurization system can be precisely controlled and is inherently safer, as it avoids the hazards of handling and operating massive rotating equipment.
Solution Approach 2:
The thrust device acts as a safe intermediary that applies forces internally without requiring external heavy equipment. By containing the force generation mechanism within the engine structure itself, the system eliminates safety risks associated with external overturning equipment. The flexible membrane and pressurizable chamber provide a controlled, contained method for applying tensile stress that does not expose personnel to the dangers of heavy mechanical operations.
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 method simplifies and speeds up the testing process, eliminating the need for overturning, reducing costs and enhancing safety by allowing independent adhesion checks without displacing the engine, while maintaining optimal safety conditions.
Implementation Method 1
a thrust device, in particular a pressurisable chamber (31) with a flexible membrane, for generating an axial thrust on the mass of solid propellant
Implementation Method 2
a flexible membrane, for generating an axial thrust on the mass of solid propellant
Implementation Method 3
The propellant tends to shrink while solidifying, but, as it adheres to the thermal protection, it is subject to tensile stresses
Data Source
AI summary
A solid-propellant rocket engine (1) has a casing (2) and a thermal protection (15) internally coating the casing and delimiting a housing (17), which contains a mass of solid propellant (3); the thermal protection has a fixed portion (22) and at least one movable portion (23) that adheres to the mass of solid propellant (3) and can be moved from a back position to a forward position with respect to the fixed portion (22) through a thrust system obtained by pressuring a chamber 31 provided by installing a membrane 32 between the fixed portion 22 and the movable portion 23; the engine is tested by verifying the adhesion of the mass of solid propellant (3) to the movable portion (23) after having moved the movable portion (23) to the forward position by means of a thrust directed from the fixed portion towards the mass of solid propellant (3).