Gravity Gradiometer Flexure Web Stop Mechanism
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Solution Overview
Problem
Gravity gradiometers face challenges in maintaining the integrity of flexure webs, which are crucial for precise measurement of gravity gradients, as they can break or degrade due to over-strain, impairing the movement of sensor masses and affecting measurement accuracy, especially in airborne applications.
Innovation Solution
Incorporating a stop mechanism that limits the movement of the sensor mass within the elastic limit of the flexure web, using abutment surfaces to prevent over-strain and ensure proper movement, and optionally forming the flexure web as a separate element for easier replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the flexure web is made very thin to enable precise movement of the sensor mass, then measurement precision is improved, but the flexure web becomes fragile and prone to breaking
Solution Approach 1:
The stop mechanism is pre-positioned to limit the movement range of the sensor mass before the flexure web can be over-strained. This preliminary protective action prevents the web from entering the plastic deformation zone, thereby maintaining its elastic properties and preventing breakage while still allowing sufficient movement for precise gravity gradient measurements.
2Measurement precision
If the sensor mass is allowed to move freely in response to gravity gradient, then measurement accuracy is improved, but the flexure web may be over-strained and break
Solution Approach 1:
The stop mechanism acts as an intermediary element between the sensor mass and the flexure web. It mediates the movement by providing a physical barrier that prevents excessive displacement, thereby protecting the flexure web from over-strain while allowing the sensor mass to move sufficiently to detect gravity gradient changes accurately.
3Measurement precision
If the flexure web is made thinner to reduce mass, then measurement sensitivity is improved, but the elastic limit is reduced making it more prone to permanent deformation
Solution Approach 1:
The stop mechanism is pre-positioned to limit the movement range of the sensor mass before the flexure web can be over-strained. This preliminary protective action prevents the web from entering the plastic deformation zone, thereby maintaining its elastic properties and preventing breakage while still allowing sufficient movement for precise gravity gradient measurements.
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 protects the flexure web from degradation, ensuring accurate measurement of gravity gradients by maintaining its elastic properties and preventing breakage, thus enhancing the reliability of airborne gravity gradiometer readings.
Implementation Method 1
a flexure web between the mass and the support for allowing movement of the mass relative to the support
Implementation Method 2
a stop for limiting movement of the mass to an amount within the elastic limit of the flexure web
Data Source
AI summary
A gravity gradiometer is disclosed which comprises a pair of sensor masses arranged in housings. Transducers are provided for measuring movement of the sensor masses in response to the gravity gradient tensor. The masses are supported for movement by a flexure web between the mass and a support and a stop comprises a pair of abutment services defined by a cut prevent movement of the sensor masses beyond the elastic limit of the flexure web.