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This part addresses the feasibility of reconstructing the pressure trace in IC engine from non-intrusive structural vibration measurements by means of an optimal inverse filter. The problem is formally phrased into the general framework of cyclostationary processes introduced in Part I of this paper. It is proved that the optimal inverse filter is periodically varying. A number of guidelines are given for efficiently applying the proposed deconvolution scheme. [Copyright &y& Elsevier]

Condition monitoring of IC engines through the analysis of their vibrations has been recognized to be a difficult issue, essentially because of the complexity of the signals that are involved. This paper introduces an original approach which explicitly takes into account the non-stationary nature of the vibration signals. The key idea is to rephrase the issue into the framework of cyclostationary processes, which is perfectly suited for describing physical phenomena generated on a cyclic basis. A general methodology is introduced that is based on angular sampling and cyclic signal processing. It serves as a strong basis for designing ad hoc diagnostic indicators. [Copyright &y& Elsevier]