Gravity Gradiometer Replaceable Flexure Web Design
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Solution Overview
Problem
Existing gravity gradiometers face challenges in distinguishing spatial variations of the gravitational field from temporal fluctuations, especially when used in airborne applications, and require costly and time-consuming replacements of integral flexure web components when they break.
Innovation Solution
A gravity gradiometer design featuring a separately formed flexure web element with dovetail shaped portions that can be easily replaced, allowing the sensor bar and housing to pivot via the flexure web, eliminating the need for complete replacement of the housing and bar.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the flexure web is formed as an integral part of the housing and sensor bar, then the structural strength and reliability are improved, but the ease of repair deteriorates because complete replacement of housing and bar is required when the flexure web breaks
Solution Approach 1:
The flexure web is segmented from the housing and sensor bar, forming a separate replaceable element. This allows the flexure web to be replaced independently without replacing the entire housing and sensor bar assembly, thus improving ease of repair while maintaining structural reliability through proper connection mechanisms (dovetail joints with interference fit).
Solution Approach 2:
The flexure web is designed as a disposable component that can be easily discarded and replaced when broken, while the expensive housing and sensor bar are recovered and retained. This approach improves ease of repair by allowing quick replacement of the sacrificial flexure web element without wasting the valuable integral components.
2Manufacturing precision
If the flexure web is formed as an integral part of the housing and sensor bar, then the manufacturing precision is improved, but the loss of time increases due to time-consuming machining of complete new housing and bar
Solution Approach 1:
The flexure web is segmented as a separate manufacturable component with standardized connection features (dovetail portions). This allows pre-manufacturing and stocking of replacement flexure web elements, dramatically reducing replacement time while maintaining manufacturing precision through controlled connection interfaces.
Solution Approach 2:
Replacement flexure web elements are prepared in advance and can be stocked as spare parts. The connection interfaces (dovetail channels and portions) are pre-formed with precise tolerances during initial manufacturing, enabling quick field replacement without time-consuming on-site machining operations.
3Ease of repair
If the flexure web element is separately formed with dovetail portions, then the ease of repair is improved, but the device complexity increases
Solution Approach 1:
The device is segmented into modular components (housing, sensor bar, flexure web element) with standardized connection interfaces. The dovetail portions provide simple geometric interlocking that reduces assembly complexity despite the increased number of parts, as the connections are straightforward insert-fit operations rather than complex fastening procedures.
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 design simplifies maintenance by allowing for the replacement of only the broken flexure web element, reducing costs and time, while maintaining accurate measurements of the gravity gradient tensor components.
Implementation Method 1
a flexure web supporting the sensor bar in the housing for pivotal movement about the flexure web
Implementation Method 2
heating the housing and cooling the flexure web element, locating the dovetail shaped portions of the flexure web element within the dovetail shaped channels of the sensor bar and the housing and allowing the housing, the sensor bar and the flexure element to revert to substantially the same temperature to firmly connect the flexure web element to the sensor bar and to the housing by contraction of the housing and bar channels and expansion of the dovetail shaped portions
Implementation Method 3
contraction of the housing and bar channels and expansion of the dovetail shaped portions of the flexure web element into a tight fit within the channels
Data Source
Figure 1~2
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Figure 5~7
AI summary
A gravity gradiometer and method for forming a pivot flexure web for a gradiometer is disclosed. The gradiometer has measurement bars (41, 43) supported in housings (45) and (47) and transducers (71) for measuring movement of the bars to provide an indication of the gravity gradient tensor. The bars (41, 43) are mounted on flexure webs. The webs are formed in separate elements to the housing and bars.