Evaluating Degradation Coefficients from Existing System Models

A generalization of the Degradation-Entropy Generation (DEG) theorem to multi-disciplinary multi-physics system-process analysis via a combination with pre-existing system models is presented in this article. Existing and DEG methodology are reviewed, method for evaluating degradation coefficients Bi proposed. These characterize system’s transformation based on active dissipative mechanisms, including temperature effects. The consistency entropy generation characterizing then inherited by these often-empirical models, thereby rendering them more robust applicable similar systems without need numerous tests measurements model corrections. approach applies all can quickly analyze predict performance degradation, even absence experimental data (using known properties material constants). Demonstrated applications herein include mechanically loaded (frictional wear, grease shearing, fatigue loading), electrochemical energy systems, thermal processes, others.