Bedrock Stress Strain Sensor Orthogonal Pressure Receiving
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional stress and strain sensing devices buried in bedrock struggle to independently and accurately measure stress and strain, as they sense deformation of the cylindrical case rather than direct bedrock stress, requiring indirect computation of stress from measured strain.
Innovation Solution
A stress and strain sensing device with pillar-shaped and pressure receiving members arranged orthogonally on a common axis, allowing direct sensing of stress and strain without mechanical connection to the case, utilizing a displacement sensor to measure between the pressure receiving surfaces, and an elastic ring-shaped connection member to amplify and output displacement changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cylindrical case is used to sense bedrock strain, then the device can be buried and installed in bedrock, but it becomes difficult to independently and correctly sense the strain of the bedrock applied to the case in a certain direction
Solution Approach 1:
The device divides the sensing function into separate components: pressure receiving members for stress sensing and displacement sensors for strain sensing, rather than relying on a single cylindrical case to perform both functions simultaneously. This segmentation allows independent and accurate measurement of each parameter without interference from the case's overall deformation
Solution Approach 2:
The pressure receiving members are extracted from the cylindrical case structure and positioned to be exposed to the outside through the outer peripheral wall. This extraction allows the stress sensing function to operate independently from the case's structural deformation, enabling accurate stress measurement without being affected by case strain
2Measurement precision
If conventional strain sensing devices are used, then they can measure bedrock strain, but they cannot directly sense stress received from the bedrock and require indirect computation
Solution Approach 1:
The device merges stress sensing and strain sensing capabilities into a single integrated system. The pressure receiving members directly sense stress from the bedrock while displacement sensors measure case deformation, allowing both parameters to be obtained simultaneously without requiring indirect computation from strain alone
Solution Approach 2:
The pressure receiving members act as intermediaries between the bedrock and the sensing system. These members are exposed to the outside through the case wall and directly receive stress from the bedrock, converting it into measurable displacement that can be directly read by displacement sensors
3Strength
If the pressure receiving member is mechanically connected with the case, then structural support is provided, but the deformation of the case affects the displacement amount between pressure receiving surfaces
Solution Approach 1:
The pressure receiving member is extracted from mechanical connection with the case, allowing it to move independently relative to the case structure. This extraction ensures that case deformation does not affect the displacement measurement between pressure receiving surfaces, while the member remains supported by the case through non-mechanical means
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
Enables continuous, direct measurement of absolute stress and strain values over long periods, independent of bedrock properties, with enhanced accuracy and sensitivity for earthquake prediction research.
Implementation Method 1
a pressure receiving member that has two pressure receiving surfaces for sensing stress received from the bedrock
Implementation Method 2
the two pressure receiving surfaces are both arranged on a common axis orthogonal to an axial direction of the case such that the two pressure receiving surfaces are exposed to an outside through an outer peripheral wall of the case
Data Source
AI summary
A stress and strain sensing device capable of continuously sensing stress received from bedrock and strain of the bedrock over a long period of time is provided.A stress and strain sensing device has a pillar-shaped case to be buried and installed in bedrock, a pressure receiving member that has two pressure receiving surfaces for sensing stress received from the bedrock and strain of the bedrock, wherein the two pressure receiving surfaces are both arranged on a common axis orthogonal to an axial direction of the case such that the two pressure receiving surfaces are exposed to an outside through an outer peripheral wall of the case and wherein the two pressure receiving surfaces are not connected with the case mechanically, and a displacement sensor that senses the stress received from the bedrock and the strain of the bedrock based on a displacement amount between the two pressure receiving surfaces.