Received: 2013.11.22 Accepted: 2014.01.24 Published: 2014.03.05 DETECTION OF CHANGES OF THE SYSTEM TECHNICAL STATE USING STOCHASTIC SUBSPACE OBSERVATION METHOD (original) (raw)

System diagnostics based on vibroacoustics signals, carried out by means of stochas-tic subspace methods was undertaken in the hereby paper. Subspace methods are the ones based on numerical linear algebra tools. The considered solutions belong to diag-nostic methods according to data, leading to the generation of residuals allowing fail-ure recognition of elements and assemblies in machines and devices. The algorithm of diagnostics according to the subspace observation method was applied – in the paper – for the estimation of the valve system of the spark ignition engine. Keyworda: system diagnostic, subspace method, vibroacoustic.