Reference matrix for multi–axis random vibration control tests

Student thesis: Master's Thesis

Abstract

Nowadays the advantages of performing Multiple-Input Multiple-Output (MIMO) Random Vibration Control tests are widely accepted by the environmental engineering community. However their practice still needs to grow because of the high degree of expertise needed to perform these tests. The challenges of MIMO Random Control start even before the actual test, in the test definition phase. The target that needs to be reached during the test is a full Spectral Density Matrix. Defining this matrix with no a-priori knowledge of the crosscorrelation between control channels could be problematic: filling in the off-diagonal terms, in fact, must guarantee that the target has a physical meaning. This is translated in the algebraic constraint that the target matrix needs to be positive semi-definite. On the other hand the pushing driver of any Random Vibration Control test is to be able to replicate specific PSDs (test requirements). Even if several author tackled the problem to define a realisable full MIMO Random Reference, a clear gap in the standard procedures about a generally accepted and robust method still exists. The purpose of this work is to investigate more innovative target generation procedures pointing out the advantages and the challenges in terms of physical meaning and their impact on the random control strategy, in order to aim to a well-defined automatic procedure to be included in the standard practice.
Date of Award2016
Original languageEnglish
SupervisorBart Peeters (Promotor) & Emiliano Mucchi (Promotor)

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