Peugeot Citroen Noise and Vibration Optimisation of a Gasoline Engine

The vibratory and acoustic behaviour of the internal combustion engine is a highly complex one, consisting of many components that are subject to loads that vary greatly in magnitude and which operate at a wide range of speeds. The TU5JP engine is currently used for a number of vehicle platforms produced by PSA, including the successful “Super mini” class car, the Citroen Saxo. The block, head and transmission were constructed of predominantly low-order hexahedral elements, whilst the ancillaries were modelled using a combination of high order tetrahedral, shell and beam elements wherever appropriate. The technical approach detailed here is representative of Ricardo’s standard methods applied to the analysis of the powertrain to optimise its noise and vibration characteristics. Modal Analysis, Dynamic Load Calculation, The excitation loads acting on the engine were calculated using ENGDYN. ENGDYN is used to predict the time-domain response of the 3-dimensional vibration of the coupled crank train and cylinder block system with non-linear oilfilms at each of the main journal bearings. Forced Response and Acoustic Analysis. baseline designs and a difference diagram comparing the two. These figures indicate negligible improvement due to this modification. External Ribs on Driveshaft Side of Engine.

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