Mechanically Attached Thermal Protection System with Modular Tiles
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Solution Overview
Problem
Conventional thermal protection systems for vehicles exposed to high heat sources face challenges such as lengthy maintenance and replacement times, adhesive failures at high temperatures, and inefficient gap filling between insulating tiles, leading to reduced reliability and increased aerodynamic drag.
Innovation Solution
A mechanically attached thermal protection system featuring insulating tiles with air channels, capillaries, and a pressurized air source for active cooling, along with a fastening system using brackets and studs to allow closer tile spacing and reduce maintenance complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesively bonded thermal protection systems are used, then thermal protection is provided, but maintenance and replacement time increases significantly
Solution Approach 1:
The thermal protection system is divided into modular insulating tiles that can be independently removed and replaced. Each tile is a separate component with standardized mechanical attachment features, allowing individual tile replacement without affecting adjacent tiles or requiring complete system disassembly, thereby reducing maintenance time.
Solution Approach 2:
The patent replaces adhesive bonding with a mechanical attachment system using brackets, fasteners, and standoff structures. This mechanical system allows for quick tool-based removal and installation of tiles without the time-consuming processes of adhesive application, curing, or removal required by bonded systems.
2Reliability
If adhesively bonded thermal protection systems are used, then thermal protection is provided, but inspection and repair complexity increases
Solution Approach 1:
By segmenting the thermal protection into discrete, modular tiles with standardized mechanical attachments, the system simplifies inspection procedures. Each tile can be individually accessed, removed, and inspected without disturbing adjacent components, reducing overall inspection complexity compared to bonded systems where tiles are permanently attached to the substrate.
Solution Approach 2:
The mechanical attachment system introduces intermediate components (brackets, fasteners, standoffs) that serve as accessible inspection points and simplify the relationship between tiles and the substrate. These intermediaries provide standardized interfaces that make inspection and repair procedures more systematic and less complex than dealing with direct adhesive bonds.
3Reliability
If adhesively bonded thermal protection systems are used, then thermal protection is provided, but the system becomes difficult to remove without damage
Solution Approach 1:
The mechanical attachment system replaces adhesive bonding with reversible mechanical connections using brackets, fasteners, and standoff structures. These mechanical connections can be detached using standard tools without applying forces that would damage the ceramic tiles or the substrate, unlike adhesive removal which often requires forceful mechanical separation that risks tile or substrate damage.
4Ease of repair
If mechanical attachment with standoffs is used, then tile replacement is easier, but aerodynamic drag increases due to larger gaps
Solution Approach 1:
The mechanical attachment system is designed with flexible accommodation for thermal expansion and contraction of tiles during operation. The attachment mechanism allows for controlled movement and positioning adjustments, enabling tighter tile spacing that reduces aerodynamic gaps while maintaining the ease of tile replacement benefit of mechanical attachment.
5Object-generated harmful factors
If insulating tiles are placed closer together, then aerodynamic drag is reduced, but gap filling becomes more difficult and prone to failure
Solution Approach 1:
The mechanical attachment system with brackets and fasteners creates defined, standardized gap dimensions between adjacent tiles. This segmentation approach allows for consistent gap filling material application and improves reliability by ensuring uniform gaps that are easier to fill properly compared to irregular gaps that may result from other attachment methods.
Solution Approach 2:
The mechanical attachment components (brackets, fasteners) serve as intermediaries that define and maintain consistent spacing between tiles. These intermediaries provide reference surfaces and structural support that facilitate reliable gap filling, as the gaps are precisely defined by the attachment hardware rather than being irregular spaces that are difficult to fill consistently.
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 solution provides improved thermal protection, reduced maintenance time, and increased reliability by allowing closer tile spacing, active cooling, and efficient gap filling, while maintaining structural integrity and reducing aerodynamic drag.
Implementation Method 1
A plurality of air channels within the inner core, wherein each air channel originates at an orifice through the outer shell at the first surface of the insulating tile, a plurality of capillaries within the inner core that branch from the plurality of air channels
Data Source
AI summary
A mechanically attached thermal protection system (MATPS) includes an insulating tile having a top surface, a bottom surface, and a plurality of access holes that extend through the insulating tile from the top surface to the bottom surface. A plurality of brackets include a first end attached to the insulating tile and a second end including a mounting hole therethrough, the second end being positioned proximate the bottom surface of the insulating tile. A plurality of fasteners are positioned proximate the bottom surface of the insulating tile and at least partially positioned within one of the access holes so as to be accessible from the top surface of the insulating tile through one of the plurality of access holes. A MATPS including a plurality of air channels within the insulating tile and a method for sealing these air channels to those within an adjacent structure is also described herein.