Abstract
PurposeAcoustic and vibration signals taken from engine often provide significant dynamic information on mechanical and thermodynamic system conditions. The failure characteristics with its quantity description point at the nature and intensity of an incorrectness during normal engine operation, giving the basic principles for more accurate process run monitoring and recognition of fault sources influenced on combustion process run.MethodProblems of failure recognition for CI engine systems have been described. Attributes are created for a combustion run, also for malfunctions in a real engine work maps. The additional new feature of a method is connected with taking into account an empirical signal of combustion runs for each cylinder units and having applied advanced procedures of vibroacoustic signal measures. The way of quantification of combustion changes with accompanying process characteristics in different signal domains was approximated. Accurate recognition and separation of fault cases in normal engine work cycles is the first step of a signal qualification.Results and ConclusionsFault source detection for diesel engine was analyzed and its accuracy was considered to generate the features most sensible for a process changes. The obtained analyses prove that it is capable to extract fault components from vibroacoustic signal run and precisely calculate its intensity point estimators.
Highlights
Expansion of carrying systems determines the negative envi‐ ronmental effects, directly affecting the functioning of indi‐ vidual ecosystems
The first of them takes into account the toxic emission parameters and their changes in specified engine work area, while the acoustic related part of the diagnostic procedure concerns chosen sound pressure level characteristics as a function of engine brake power
Com‐ parison of calculated values with the values for a normal engine work gives the important differences of model and measured signal estimators, and taking into account emis‐ sion and acoustic estimators more precise diagnostic of the injection and combustion process taking place in combustion engine in specified operation conditions can be made
Summary
Expansion of carrying systems determines the negative envi‐ ronmental effects, directly affecting the functioning of indi‐ vidual ecosystems. Struc‐ tural models, mapping machine element interactions, are often used in diagnostic tests Thanks to them, it is possi‐ ble to conclude effectively of the physical quantity types, as signals dependent on the object state and with the greatest sensitivity to its changes. It is possi‐ ble to conclude effectively of the physical quantity types, as signals dependent on the object state and with the greatest sensitivity to its changes In this case, diagnosing phases, detection, location and identification are important, aim‐ ing to evaluate irregularities and quantity changes that are present at combustion unit operation and forced by engine element damages. In this part of a scien‐ tific authors’ research is considered of techniques of the fault source recognition and separation for compression ignition engines, on the basis of accompanying process assessment
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