Box-Section Bearing Beams for Launch Vehicle Engine Frames
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Solution Overview
Problem
The existing force transmission frame structures in launch vehicle engines lack sufficient bending resistance and optimal mass distribution, which affects the thrust-weight ratio and carrying capacity of launch vehicles, necessitating an improvement in structural design to maximize thrust while ensuring safety.
Innovation Solution
A main frame structure with box-section bearing beams, featuring upper and lower surfaces, side beam walls, penetrating transverse ribs, and a connecting ring, designed to form a cavity structure with specific geometric and material properties to enhance stiffness and strength, minimizing mass and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional solid beam structures are used, then bending resistance is improved, but mass increases
Solution Approach 1:
The patent employs thin-walled box-section beams with wall thickness of 3-10mm, utilizing the shell structure's high strength-to-weight ratio. The closed-section box beams provide excellent bending resistance through their geometric stiffness while maintaining minimal mass, directly resolving the contradiction between strength and weight.
Solution Approach 2:
The patent uses composite material construction combining high-strength steel (yield strength ≥355MPa) with optimized geometric configurations. The box-section beams incorporate penetrating transverse ribs and arc chamfers to create a composite structural system that achieves superior bending resistance with reduced mass compared to solid beams.
2Power
If structural mass is reduced, then thrust-weight ratio is improved, but bending resistance decreases
Solution Approach 1:
The thin-walled box-section beams provide high structural efficiency with wall thickness of 3-10mm, achieving optimal thrust-weight ratio while maintaining sufficient bending resistance through the closed-section geometry and strategic reinforcement features.
Solution Approach 2:
The patent applies local quality enhancement through penetrating transverse ribs at critical locations and arc chamfers at stress concentration zones. This localized reinforcement provides necessary bending resistance only where required, minimizing overall mass while maintaining structural integrity for improved thrust-weight ratio.
3Strength
If box-section beams with penetrating transverse ribs are used, then bending resistance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent specifies parameter ranges (wall thickness 3-10mm, rib thickness 0.5-2 times wall thickness, inclination angles 30-60°) that balance manufacturing feasibility with structural performance. These standardized parameters enable production through common techniques like welding or additive manufacturing while achieving superior bending resistance.
Solution Approach 2:
The box-section beams are segmented into standardized components with repeating geometric features (penetrating transverse ribs, arc chamfers, flange structures). This segmentation allows modular manufacturing and assembly, reducing overall manufacturing complexity despite the enhanced structural features.
4Reliability
If high-strength materials are used, then structural safety is improved, but manufacturing difficulty increases
Solution Approach 1:
The patent specifies material parameters (yield strength ≥355MPa, wall thickness 3-10mm) that balance structural safety with manufacturability. These parameters are chosen to be compatible with conventional high-strength steel and allow production through standard welding or additive manufacturing processes.
Solution Approach 2:
The patent incorporates arc chamfers with standardized radii (5-20mm) at stress concentration zones, which not only improve structural safety by reducing stress peaks but also facilitate smooth material flow during manufacturing processes like welding and additive manufacturing, reducing manufacturing difficulty.
Data Source
AI summary
A main frame structure having box-section bearing beams of a launch vehicle engine includes a body. The body includes upper bearing table tops, lower bearing table tops, a cross gasket, a connecting ring and the box-section bearing beams. The box-section bearing beam includes an upper surface, a lower surface and two side beam walls, and has a cavity structure. Penetrating transverse ribs penetrating the two side beam walls are arranged on the box-section bearing beams, and one ends of the box-section bearing beams are circumferentially distributed at an outer side of the connecting ring. The lower bearing table tops are arranged at the outer side of the connecting ring, the lower bearing table tops are connected to the cross gasket, and the other ends of the upper surfaces and the lower surfaces are connected by means of arc chamfers and are connected to the upper bearing table tops.