Gas Turbine Guide Vane Blank Inspection Segmentation
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Solution Overview
Problem
Existing methods for fabricating structural guide vanes in gas turbine engines face challenges in improving yield while identifying and accommodating material inconsistencies, which can lead to unnecessary rejection of vane blanks during inspection.
Innovation Solution
Defining specific zones within the vane blank with different acceptable depths for material inconsistencies, allowing for machining to remove defective areas and ensuring only unacceptable inconsistencies are addressed, thereby optimizing the fabrication process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If material inspection is performed on the entire vane blank, then all material inconsistencies are identified, but yield is reduced due to unnecessary rejection of usable blanks
Solution Approach 1:
The inspection area of the vane blank is segmented into multiple zones based on their functional importance. Critical zones that affect structural integrity are inspected with higher scrutiny, while non-critical zones are either excluded from inspection or inspected with lower standards. This segmentation allows the process to focus inspection resources on areas that truly matter, reducing false rejections of usable blanks while maintaining reliability where it counts.
Solution Approach 2:
Different inspection criteria and acceptance standards are applied to different regions of the vane blank based on their local functional requirements. Critical areas have stricter material consistency requirements, while non-critical areas allow for greater variability. This local quality approach ensures that inspection accuracy is optimized for each specific region, preventing unnecessary rejection of blanks that have minor inconsistencies in non-critical zones.
2Strength
If strict material consistency requirements are applied throughout the vane blank, then structural integrity is ensured, but fabrication cost increases due to higher rejection rates
Solution Approach 1:
The vane blank is divided into critical and non-critical regions, with strict material consistency requirements applied only to critical zones that directly impact structural integrity. Non-critical zones are subject to more lenient standards. This segmentation maintains structural strength where needed while reducing the overall number of rejections, thereby lowering fabrication costs associated with scrap and rework.
Solution Approach 2:
Different material consistency standards are implemented for different regions of the vane blank based on their structural importance. Critical areas requiring high strength have stringent inspection criteria, while non-critical areas allow for greater material variability. This local quality differentiation ensures structural integrity is maintained in essential zones while reducing manufacturing costs through lower rejection rates overall.
3Reliability
If comprehensive inspection of the vane blank is performed, then all defects are detected, but inspection time and complexity increase
Solution Approach 1:
The inspection process is segmented into different stages and zones. Critical zones receive thorough inspection, while non-critical zones are either inspected more quickly or excluded from detailed inspection. This segmentation reduces overall inspection time while maintaining high defect detection accuracy for the critical areas that matter most for structural integrity.
Solution Approach 2:
Different inspection thoroughness and time allocation are applied to different regions of the vane blank based on their importance. Critical areas receive comprehensive inspection to ensure defect-free performance, while non-critical areas receive expedited or reduced inspection. This local quality approach optimizes the balance between defect detection accuracy and inspection time by focusing resources on where they provide the most value.
Data Source
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AI summary
A method of forming a guide vane is disclosed. The method includes forming a vane blank with sufficient material to fabricate the guide vane in accordance with any one of a plurality of different vane classes. The vane blank is inspected for material inconsistencies, and material is removed from the vane blank to form a desired guide vane in accordance with one of the plurality of vane classes. The inspection process includes disregarding at least one material inconsistency in a region of the vane blank that is removed to form the guide vane.