Wedge-Transducer Force Measurement Calibration for Bridge Monitoring
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Solution Overview
Problem
The inaccuracy in determining the coefficient of friction for wedge-shaped height-adjustment force measurement apparatuses in service leads to inaccurate vertical force measurements, which is crucial for bridge health monitoring.
Innovation Solution
A method for accurately determining the coefficient of friction involves recording horizontal or lateral force values during height changes and adjustments, deriving a relational expression based on mechanical equilibrium, and calculating the coefficient of friction using these values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a wedge-shaped height-adjustment force measurement apparatus is used, then the vertical force can be measured through horizontal force measurement, but the coefficient of friction changes due to wear and aging, leading to measurement inaccuracy
Solution Approach 1:
The patent applies preliminary action by performing in-situ calibration of the force measurement apparatus before actual use. The calibration process determines the coefficient of friction under actual service conditions, ensuring accurate vertical force measurements from the outset. This pre-calibration step eliminates the need to assume a fixed friction coefficient, thereby resolving the measurement accuracy issue caused by wear and aging.
2Device complexity
If the coefficient of friction is assumed to be constant, then calculations are simplified, but the actual coefficient changes due to wear and aging of the wedge block
Solution Approach 1:
The patent implements self-service by enabling the force measurement apparatus to self-calibrate in its own service environment. The in-situ calibration method uses the actual apparatus under field conditions to determine its own coefficient of friction, eliminating the need for external laboratory testing or assumption of constant values. This self-determined friction coefficient ensures both reliability and practical applicability.
3Measurement precision
If in-situ calibration is performed to determine the coefficient of friction, then measurement accuracy improves, but the calibration process requires additional time and operational steps
Solution Approach 1:
The calibration process is performed as a preliminary action before the force measurement apparatus is put into service. By completing the in-situ calibration beforehand, the coefficient of friction is determined once under actual service conditions, and this value can be used for subsequent measurements without repeated calibration, thereby minimizing time loss while ensuring accuracy.
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 method allows for precise determination of the coefficient of friction, enabling accurate vertical force calculation and calibration, ensuring reliable bridge monitoring and safety.
Implementation Method 1
a coefficient of friction of the wedge-shaped height-adjustment force measurement apparatus may change
Implementation Method 2
deriving a relational expression of a coefficient of friction, an angle of inclination of the load transducers and a horizontal or lateral force according to a mechanical equilibrium relationship between forces applied to the load transducers
Data Source
AI summary
A method for calibrating an in-service bridge force-measurement bearing on the basis of accurate determination of a coefficient of friction includes steps of A1: recording a value of a horizontal or lateral force applied to a force measurement apparatus, and recording a horizontal or lateral force value of a sensing apparatus (5) before the force measurement apparatus is lifted; then applying a horizontal or lateral force to two wedge-shaped load transducers (3), and recording a horizontal or lateral force value of the sensing apparatus (5) during the change in height or during a pause in the change; A2: deriving a relational expression of a coefficient of friction, an angle of inclination of the load transducers (3) and a horizontal or lateral force; and A3: calculating a value of the coefficient of friction according to the recorded horizontal or lateral force values and the relational expression in A2.