Impedance Signal Temperature Compensation for Accurate SHM
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Solution Overview
Problem
Existing temperature compensation methods for electromechanical impedance monitoring fail to accurately account for frequency-dependent amplitude deviations caused by temperature changes, leading to inaccurate and misleading structural health monitoring results.
Innovation Solution
An automated temperature compensation method that determines error values and offsets using a reference signal, calculates a temperature deviation coefficient, and performs horizontal and vertical compensation to improve impedance signal accuracy, addressing frequency-dependent amplitude deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the effective frequency shift method is used for temperature compensation, then the compensation process is simplified, but the compensation accuracy is limited due to not considering frequency difference of amplitude deviation
Solution Approach 1:
The patent segments the temperature compensation process into two distinct parts: horizontal frequency shift compensation and vertical amplitude deviation compensation. By dividing the compensation task into separate frequency-domain and amplitude-domain operations, the method achieves both computational simplicity and high compensation accuracy, resolving the contradiction between ease of implementation and measurement precision.
Solution Approach 2:
The patent changes the compensation approach by introducing temperature-dependent amplitude deviation coefficients that vary with frequency. Instead of using a fixed compensation method, the system dynamically adjusts compensation parameters based on temperature conditions and frequency characteristics, thereby achieving high accuracy without significantly increasing computational complexity.
2Device complexity
If temperature compensation is not performed, then the monitoring system remains simple, but the impedance signal changes caused by temperature interfere with damage state detection
Solution Approach 1:
The patent extracts the temperature effect from the impedance signal by separately compensating for frequency shifts and amplitude deviations caused by temperature. This extraction approach removes the harmful temperature interference while preserving the structural damage information, thereby improving reliability without requiring a fundamentally complex monitoring system architecture.
Solution Approach 2:
The patent implements feedback mechanisms by using reference impedance signals at different temperatures to determine amplitude deviation coefficients. The system continuously compares current impedance signals with temperature-compensated reference signals, adjusting compensation parameters based on observed deviations, which enhances monitoring reliability through adaptive feedback control.
Data Source
AI summary
Disclosed are an automated temperature compensation method, an apparatus and a storage medium. The present application obtains an impedance information set collected from at least one position of an object to be measured; determines n error values corresponding to the first impedance signal object according to a first impedance signal, n preset offsets and a pre-obtained reference signal, and determines a final error value according to the n error values and a preset standard; determines a horizontal compensation impedance signal according to the offset corresponding to the final error value and the first impedance signal, and determines a vertical compensation impedance signal according to the reference signal, the horizontal compensation impedance signal and the temperature deviation coefficient.