Filter appraisal

Instituting a rapid initial appraisal of change requests to filter out rejected changes... 

Noller, E. Spendlove, J.D. An appraisal of the gelatin foam filter as a sampler for bacterial aerosols. Appl. Environ. Microbiol. 1956, 4, 300-306. 

The filters tuning is a crucial issue due the need to quantify the accuracy of the model in terms of the process noise covariance matrix for process characterized by structural uncertainties which are time-varying. Thus, approaches to time-varying covariances were studied and included to a traditional EKF and an optimization-based state estimators constrained EKF (CEKF) formulations. The results for these approaches have shown a significant improvement in filters performance. Furthermore, the performance of these estimators as a transient data reconciliation technique has been appraised and the results have shown the CEKF suitability for this proposes. 

The design of coolant filters and separators for machine tool fluids is an extremely complex and varied subject. Some of the general aspects that have to be considered before a preliminary appraisal can be made are ... 

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