Project description
In this research project, we are developing a method for automated crack detection in screws using electromechanical impedance spectra. Using permanently installed piezoelectric sensors, the smallest structural-dynamic changes can be detected at an early stage and continuously monitored. This enables reliable, economical and permanent condition monitoring of critical bolted joints in structures such as offshore wind turbines and steel structures.
Focal points of the project
Development and qualification of a method for condition monitoring (damage detection) of bolts based on electromechanical impedance spectra.
The method must be able to
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Detect damage reliably (statistical significance), taking into account the "true positive rate" of a binary classifier (priority 1), even under
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varying ambient conditions (temperature) (Priority 1) and at the same time
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monitor the sensors / actuators independently (priority 2).
Everything at a glance
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Duration
01.03.2023 - 28.02.2026 (ongoing, extended) -
Research area
Structural health monitoring, damage detection, screws, material fatigue, electromechanical impedances -
Funding
Federal Ministry of Economics and Climate Protection (BMWK): €218,262 -
Project partner
Professorship of Mechanics with a focus on damage monitoring
Research methods & procedure
FE preliminary examinations
Model design and selection of suitable piezo sensors.
Calibration of the vibration tests
Production of test specimens and execution / evaluation of vibration tests.
Experimental trials
Tests on intact, damaged and cracked screws under the influence of temperature
Temperature compensation
Provision of compensation methods Temperature.
Test evaluation crack detection and temperature influence
Evaluation of the tests on undamaged and damaged samples.
Numerical models
Carrying out parameter studies using numerical models.
Guide
Guideline for determining the crack length in bolts based on electromechanical impedance spectra.
