Displacement Extensometer Friction Compensation
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Solution Overview
Problem
Conventional displacement measuring devices, such as LVDTs, suffer from measurement errors due to frictional forces caused by sagging center rods and are cumbersome to install, especially in horizontal configurations.
Innovation Solution
A high-resolution displacement extensometer design that includes a friction compensation member, like a vibration motor, to cancel out sagging-induced friction and a centering mechanism for easy horizontal installation, using a first and second bracket, links, and fixing members to ensure accurate positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the wire connected to the measurement object is long, then the measurement range is extended, but the center rod sags causing friction with the housing which deteriorates measurement precision
Solution Approach 1:
The patent applies mechanical vibration through a vibration motor that vibrates the center rod in a preset period. This vibration prevents the center rod from sagging and contacting the housing, thereby eliminating frictional force and maintaining measurement precision even when the wire is long.
2Measurement precision
If the displacement meter body is fixed to the measurement object in a horizontal state, then measurement accuracy is improved, but the installation process becomes cumbersome and difficult
Solution Approach 1:
The patent uses a centering member with visual guiding features (such as pointers or alignment marks) that guide the installation process to achieve horizontal alignment before final fixation. This preliminary guidance simplifies the installation process while ensuring the required horizontal state for accurate measurement.
3Measurement precision
If the center rod is made rigid to prevent sagging, then measurement precision is maintained, but the device complexity increases due to additional friction compensation mechanisms
Solution Approach 1:
Rather than making the center rod rigid or adding complex mechanical support structures, the patent uses a simple vibration motor to periodically vibrate the center rod. This prevents sagging and friction contact with minimal structural modification, maintaining precision while avoiding excessive complexity.
Solution Approach 2:
The patent replaces potential complex mechanical support structures with a vibration-based solution. The vibration motor creates dynamic motion that prevents sagging without requiring additional mechanical support elements, simplifying the overall device structure.
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 effectively reduces measurement errors by canceling frictional forces and facilitates precise, easy installation of the displacement meter body in a horizontal state, enhancing measurement accuracy and usability.
Implementation Method 1
a friction compensation member provided in the displacement meter body and providing physical stress to the center rod to cancel a frictional force due to sagging of the center rod
Implementation Method 2
cancel a frictional force due to sagging of the center rod
Implementation Method 3
a magnetic sensor using the magnetic principle is an element that converts magnetism into electricity and is a transducer in which a mechanical displacement causes a change in the magnetic flux generated between the primary coil and the secondary coil
Implementation Method 4
LVDT refers to a type of electrical transducer that measures the linear distance difference... converts mechanical displacement into an electrical signal through magnetic flux change
Data Source
AI summary
The present invention relates to a displacement extensometer for measuring the linear displacement of an object to be measured, the displacement extensometer comprising: a first bracket installed at a reference point so as to provide support force; a second bracket fixed to an object to be measured; a displacement meter body fixed to the first bracket and including a center rod connected to the second bracket, so as to detect displacement while the center rod horizontally moves according to positions of the object to be measured; a first link connecting the displacement meter body to the first bracket; a second link connecting the center rod of the displacement meter body to the second bracket; and a friction compensation member provided in the displacement meter body so as to compensate for the friction due to sagging of the center rod while providing physical stress to the center rod.