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Monitoring of the threshing process quality by using advanced vibro-acoustic indicators

Fiorati, Stefano (2011) Monitoring of the threshing process quality by using advanced vibro-acoustic indicators. PhD Thesis , Università degli Studi di Ferrara.

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    Abstract

    This PhD thesis concerns the vibro-acoustic monitoring of the threshing process in an axial flow harvesting machine. This research is a step towards the development of online control systems finalized to maximize the process efficiency and the product quality. By using different signal processing tools it is possible to analyse the link between sound/vibration and material distribution in the threshing unit. In more details, the threshing process is mainly given by two principal mechanisms: the threshing between kernels and concave and “grain over grain” effect. The goal of this research is to use vibro-acoustic signature in order to interpret in detail these two mechanisms of the threshing process. In particular, they have been explained by means of the cyclostationary approach useful to evaluate the first and second order cyclostationary contents of the signal. Moreover, the presented results show that some features obtained from the time and angular domains and from the cyclostationary approach are well correlated to the efficiency and operational parameters. Thus, they could be used for the development of an online control system.

    Item Type:Thesis (PhD Thesis)
    Date:28 March 2011
    Tutor:Dalpiaz, Giorgio
    Coordinator:Trillo, Stefano
    Institution:Università degli Studi di Ferrara
    PhD:XXIII Anno 2008 > SCIENZE DELL'INGEGNERIA
    Divisions:Dipartimento > Ingegneria
    Subjects:Area 09 - Ingegneria industriale e dell'informazione > ING-IND/13 Meccanica applicata alle macchine
    Uncontrolled Keywords:monitoraggio processo di trebbiatura, qualità indicatori vibro acustici, monitoring threshing process, quality vibro acoustic indicators
    Deposited on:13 Apr 2012 15:02

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