Embedded structural design and sensing technology for predicting
remaining useful lifetime (RUL) of a mechanical structure under
fatigue loading
Client / Market
- National Infrastructure (bridge, tunnel, dam) monitoring and safety diagnosis
company
- Machinery asset monitoring at cargo handling machine and heavy construction
equipment rental company
- Machine structure with unpredictable model-based fatigue limit due to corrosion
environment
- Improvement of machine structure with over-applied safety coefficient due to
uncertainty and deviation of future loads
Necessity of this Technology
- The existing model-based prediction method for predicting the fatigue life of
mechanical structures essentially involves the following three error sourcesuncertainty
of materials properties, unknown future loading condition and the
modeling error itself by simplification.
- Model-based life prediction using the fatigue property is difficult when the structure
is affected by corrosive environment and variable random loading.
- Prediction of remaining life is difficult for a used machine structure with unclear use
history or loads exceeding the permitted weight.
- It is useful for a machine structure that switched from preventive maintenance to
condition-based maintenance to reduce the operational expenses.
- With this technology, second damage in the system can be prevented and the golden
time can be secured in case of a big disaster.
Technical Differentiation
- It is a fatigue limit prediction technology with additional processing or attachment of an embedded structure that interlocks the
target structure mechanically. It can be called as a mechanical fuse for fatigue damage accumulation.
- It is a new concept fatigue failure prediction device that can be applied random loading and corrosive environment.
- A non-model-based sensor that monitors the health of the structure was developed.
Excellence of Technology
- To prove the superiority to existing model-based life prediction technique, an experiment with a 316 L stainless steel structure
with a constant amplitude fatigue loading was conducted, and the failure was predicted at 86% point of the entire life. (with existing
model-based prediction, there is a 25 to 280% error)
- It can be applied also for random fatigue loading.
- It can be applied regardless of material property deviation and corrosive environment.
CURRENT INTELLECTUAL PROPERTY RIGHT STATUS
PATENT
- Fatigue Failure Prediction Apparatus of Mechanical Structures (KR1718131)
KNOW-HOW
- Fatigue load-linked structure design technology considering machinability
- Failure prediction structure sensing and signal processing technology
- Failure prediction timing control technology
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