Hemispherical Leveling Apparatus for Test Article Alignment
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Solution Overview
Problem
Existing testing fixtures face challenges in accurately aligning test articles with test loads due to manufacturing tolerances and machine tolerances, leading to misalignment and eccentric loading, which results in stresses that do not represent actual service loads.
Innovation Solution
A leveling apparatus with a first member having a hemispherical concave surface and a second member with a hemispherical convex surface, allowing universal movement and adjustment via positioning devices to align the test article with the loading axis, ensuring accurate alignment and distribution of loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional rigid mounting fixtures are used to secure the test article, then the test article is firmly held in place, but misalignment with the test load occurs due to manufacturing and machine tolerances
Solution Approach 1:
The mounting fixture incorporates a spherical interface between the mounting plate and the fixture body, allowing the plate to rotate and self-align with the test load. The spherical surface enables universal movement in multiple directions, automatically compensating for manufacturing and machine tolerances to achieve precise alignment without complex adjustment mechanisms.
Solution Approach 2:
The mounting fixture transitions from a rigid fixed position to a dynamic self-aligning system. The spherical interface allows the mounting plate to move and rotate dynamically, automatically adjusting its orientation to align with the applied test load, thereby resolving the alignment issue without increasing overall device complexity.
2Measurement precision
If the test article is mounted with rigid fixtures, then the setup is simple and quick, but eccentric loading occurs leading to inaccurate stress measurements
Solution Approach 1:
The mounting fixture incorporates a self-aligning mechanism where the spherical interface automatically adjusts the mounting plate orientation in response to applied loads. This self-service alignment eliminates the need for time-consuming manual adjustment while ensuring accurate stress measurements by preventing eccentric loading.
Solution Approach 2:
The spherical surface geometry enables the mounting plate to naturally pivot and align with the test load direction, providing automatic compensation for misalignment. This curved surface design achieves precise alignment quickly without requiring complex adjustment procedures, thereby maintaining both measurement accuracy and efficient setup time.
3Manufacturing precision
If adjustable mounting mechanisms are added to correct alignment, then alignment accuracy improves, but the device complexity and setup time increase
Solution Approach 1:
The mounting fixture uses a self-aligning spherical interface that automatically adjusts to the correct orientation under load, eliminating the need for complex manual adjustment mechanisms. This self-service approach maintains ease of operation while achieving high alignment accuracy.
Solution Approach 2:
The spherical surface design provides inherent alignment capability through its geometry, allowing the mounting plate to pivot freely in multiple directions. This curved surface approach achieves precise alignment without requiring additional adjustment devices, thereby maintaining operational simplicity.
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 improves the accuracy of test results by ensuring precise alignment of the test article with the loading axis, reducing setup time, and minimizing eccentric loading, thereby providing more reliable stress measurements that validate structural design and certification.
Implementation Method 1
a first member 100 having a hemispherical concave surface 102 and a second member 120 having a hemispherical convex surface 122 configured to engage the concave surface 102 in a manner such that the second member 120 is movable relative to the first member 100
Data Source
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AI summary
An apparatus for orienting a test article (80) relative to a loading axis (32) includes a first member (100) and a second member (120). The first member may have a concave surface (102). The second member (120) may have a convex surface (122) configured to engage the concave surface (102) in a manner such that the second member (120) is movable relative to the first member (100). The test article (80) may be coupled to one of the first and second members such that relative movement thereof facilitates general alignment of the test article (80) with the axial loading axis (32). The leveling apparatus may further include a plurality of positioning devices configured to facilitate adjustment of an orientation of the second number relative to the first member (100) such that the alignment of the test article (80) may be adjusted.