USE OF CONTROL CHARTS FOR MULTI-TEMPORAL ANALYSIS OF GEODETIC AUSCULTATION DATA FROM DAMS
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Resumo
Geodesic auscultation can be used to monitor the movement of dam structures by
measuring the distance, at different epochs from fixed positions (pillars) to other
positions (targets). It is important to identify the targets that present atypical
measurements to permit managers to take corrective actions. After fitting a model
using the Least Squares Method (LSM), the residuals normally display random
behavior. Multivariate control charts are then applied to the residuals of the fitted
model from data taken of geodesic survey campaigns conducted at different epochs.
Control charts have been widely applied in other fields of research than production
processes such as public health, marketing, services. The results show that it is
possible for monitoring the multi-temporal stability by the multivariate control
charts. The method provides complementary information than the classical
univariate statistical analysis.