L'optimisation des positions de capteurs pour la détection du cliquetis dans les moteurs à explosion

摘要

In this study, we consider the problem of finding optimum sensorudpositions in a group of vibration sensors for knock detection. We proposeuda method that is less complex than holografic techniques because onlyudsignal processing and statistical tests are used . Our method is based onudthe linear prediction of an arbitrary sensor output from the remainingudoutputs in the sensor group. The relevancy of the sensor is thusudcharacterized by the closeness to zero of the multiple coherence of itsudoutput with the remaining sensor outputs at some frequencies of interest .udWe choose a suitable statistic, approximate its distribution, and constructudthe generalized sequentially rejective Benferroni test. We have found in an experiment that the sensor position proposed by the engine manufacturerudis not optimum . Experiments with a digital signal processor-basedudsystem emphasize the usefulness of this procedure . Through this procedure,udwe show that the performance of knock detectors stronglyuddepends on the position of the sensor in use and can be improvedudsignificantly with moderate effort .