System Degradation Analysis Using the Degradation-Entropy Generation Theorem
Computing & Wireless : Application Software
Available for licensing
- Jude Osara, Ph.D. , Mechanical Engineering
- Michael Bryant, Ph.D. , Mechanical Engineering
The DEG methodology for system degradation analysis applies the DEG theorem proposed by Bryant et al. (2008) in a Royal Society journal, which relates the appropriate measure of degradation (e.g., battery capacity fade, grease consistency loss and fatigue failure) as a linear combination of the irreversible entropies produced by the underlying dissipative processes that drive the degradation.
This theorem proposes a consistent thermodynamic approach using free energies and is based on conducted experiments validating the theory. Data has been collected to estimate entropies produced by the dissipative processes for:
- Batteries (Li-ion & lead-acid): joule dissipation, thermal and electrochemical entropies
- Grease: shear work, thermal and oxidation entropies
- Fatigue of all solid components: plastic strain and thermal entropies
and the measure of degradation for each system was found to be a perfectly linear combination of the aforementioned entropies.
- Creates a structured and universally consistent approach to all degradation and failure modeling, converting degradation and failure analyses into a geometry problem in a multi-dimensional entropy-failure space
- Physics-based consistent characterization of all systems
- Uses easy-to-obtain in-operation non-intrusive measurement of system’s boundary work and temperature
- 100% accuracy in monitoring, analyzing and predicting system failure
- Applies to ALL forms of degradation: All real processes are governed by the second law of thermodynamics, the deductive basis of the DEG theorem; hence, all degradations resulting from all real processes are governed by the DEG theorem.
- Unifies ALL existing degradation measures: In various disciplines, process- and system-specific reliability/performance/degradation measures exist to monitor and predict failures. The DEG theorem uses the degradation coefficients Bi to link the existing measures to the ’natural’ entropy generation components in the process/system.
- Provides a structured approach to ALL degradation/failure analysis: Same procedure, independent of process or system.
- Establishes a critical failure entropy that consistently detects instability in all systems.
All manufacturing companies; any engineering company that wants to significantly increase profits by using Analysis-Led Design, which has recently become popular among the top companies; all battery manufacture/application
- 1 U.S. patent application filed