Gravity Gradiometer Glassy Metal Flexure
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Solution Overview
Problem
Current gravity gradiometers operating at room temperature face challenges due to material creep and hysteresis, leading to poor repeatability and fragility of torsional springs, especially when used in moving vehicles for mineral exploration, requiring cryogenic cooling and sensitive instrumentation.
Innovation Solution
The design incorporates a quadrupole responder with a glassy metal flexure that allows low-loss elastic deformation, eliminating the need for cryogenic cooling and using glassy metal alloys for the flexure posts, which provide high strength and low internal loss coefficients, enhancing the instrument's sensitivity and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional torsional springs are used at room temperature, then the device structure is simple, but the material exhibits creep and hysteresis leading to poor repeatability and fragility
Solution Approach 1:
The patent changes the material parameter from conventional elastic materials to glassy metal alloys, which fundamentally alters the mechanical properties to eliminate creep and hysteresis effects while maintaining room temperature operation
Solution Approach 2:
The patent uses glassy metal alloys as composite material for the flexure posts, combining high strength, low internal loss, and resistance to creep and hysteresis in a single material system
2Reliability
If cryogenic cooling is used, then material creep and hysteresis are reduced, but the device complexity and operational requirements increase
Solution Approach 1:
The patent changes the operating temperature parameter from cryogenic to room temperature by selecting glassy metal alloys that maintain their elastic properties and resistance to creep/hysteresis at ambient conditions
Solution Approach 2:
The patent replaces the cryogenic cooling mechanical system with a room temperature operating system using glassy metal alloys, eliminating the need for complex cooling infrastructure
3Measurement precision
If conventional materials are used for flexure posts, then manufacturing is easier, but the internal loss coefficient is high reducing sensitivity
Solution Approach 1:
The patent employs glassy metal alloys for the flexure posts, which have inherently low internal loss coefficients that enhance sensitivity while maintaining manufacturability through established glassy metal fabrication techniques
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 improves the sensitivity and reliability of gravity gradiometers, enabling detection of 1 Eo averaged once per second without the need for cryogenic cooling, reducing noise from vehicle motion, and increasing the instrument's operational stability and accuracy.
Implementation Method 1
a flexure made of glassy metal which will undergo low loss elastic deformation during rotation of the mass quadrupole
Implementation Method 2
a torsional spring comprising a flexure attaching said mass quadrupole to the housing and allowing rotation of the mass quadrupole about its center of mass
Data Source
AI summary
A gravity gradiometer having quadrupole responders in which a mass quadrupole is supported by a torsional spring forming a flexure allowing rotation of the mass quadrupole about its center of mass. The flexure can be a pair of spaced apart posts. The flexure can be made from glassy metal having at room temperature a high elastic limit, high stiffness, high strength and low internal damping. The flexure can alternatively be a web made of glassy metal.