Connecting Tube Duct Casing Vibration Crack
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Solution Overview
Problem
The existing connection method between ducts and the air-distribution casing in turbine engines is prone to cracking due to vibrations, leading to non-compliance and increased costs and manufacturing time for maintaining the clearance control system.
Innovation Solution
A connecting tube that passes through the casing's sidewalls, eliminating the overhanging connection and using a bent edge as a bushing to secure the duct, thereby preventing cracks and ensuring a secure seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the duct is connected to the sidewall with an overhanging arrangement, then the connection is simple, but the vibrations cause cracking of the bushing and non-compliance
Solution Approach 1:
A connecting tube is introduced as an intermediary element between the duct and the sidewall. The connecting tube passes through the sidewall and provides a secure attachment point, eliminating the direct overhanging connection that causes cracking. The bushing is integrated into the connecting tube structure, providing both support and vibration resistance.
Solution Approach 2:
The connection arrangement transitions from a two-dimensional overhanging surface connection to a three-dimensional through-wall penetration. The connecting tube extends through the thickness of the sidewall, creating a secure anchor point on the opposite side and eliminating the problematic overhanging geometry that leads to cracking.
2Device complexity
If the duct overhangs the sidewall, then the structure is simple, but the vibrations weaken the bushing and cause cracks requiring re-work
Solution Approach 1:
The connecting tube serves as a mediator that distributes vibration stresses away from the bushing-duct interface. By passing through the sidewall and providing a secure anchor point, it prevents the bushing from weakening under vibration, thereby eliminating the need for re-work operations.
Solution Approach 2:
The connecting tube structure provides beforehand cushioning against vibration-induced cracking by creating a distributed stress path and secure anchor point before the vibrations can cause damage to the bushing or connection integrity.
3Stability of the object's composition
If the duct is secured to the sidewall, then the connection is stable, but the manufacturing time and cost increase due to cracking risks
Solution Approach 1:
The connecting tube provides a stable connection while eliminating the cracking risks associated with overhanging duct arrangements. By securing the duct through the connecting tube that passes through the sidewall, the connection achieves both stability and vibration resistance, preventing re-work operations and reducing overall manufacturing time.
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 solution stabilizes the connection, reducing the risk of cracks and maintaining the system's compliance, thus lowering costs and manufacturing time while ensuring effective air distribution for clearance control.
Implementation Method 1
a connecting tube which extends through the casing, passing through an orifice associated with each of the two sidewalls
Implementation Method 2
the edge of each orifice is bent outwardly from the casing and forms a bushing to which the connecting tube is secured
Implementation Method 3
the connection between the connecting tube and each sidewall is carried out by soldering
Implementation Method 4
The connecting tube is open in the inside volume of the casing
Data Source
AI summary
An arrangement for connecting at least one duct with an air-distribution casing, the at least one duct including two sidewalls opposite one another and including a peripheral wall connecting edges of the two sidewalls. The arrangement includes a connecting tube that extends through the casing, passes through an orifice associated with each of the two sidewalls, and is connected to the at least one duct. A system controlling clearance of a turbo engine and a turbo engine can include air-injection ducts connected to the distribution casing by such an arrangement.