Unlike exhaust noise, the intake system noise of an automobile cannot be measured because of the proximity of the engine at the point of measurement. Besides, the intake side is associated with turbocharger (booster), intercooler, cooling fan, etc., which will make the measurement of
the intake noise erroneous. Therefore, in the present investigation, the source characteristics of the intake system have been expressed as functions of the engine’s physical, operating and thermodynamic parameters. The pressure time history is first computed by means of the commercial
software AVL-BOOST for different acoustic loads (induction pipe lengths), which are then used to determine source characteristics, i.e., ps
(analogous to the open-circuit voltage and internal impedance
of an electrical source), using an appropriate multi-load method. This investigation has been conducted for both naturally aspirated and turbocharged diesel engine. Using this methodology and the resultant empirical relations, one can analyze any compression-ignition (CI) engine configuration
for the prediction of the un-muffled noise without having to carry out the rather cumbersome and time-consuming time-domain simulation of the intake side. The aim of the present study is to parameterize the source characteristics of an engine in terms of basic engine parameters, so that a
first assessment of the un-muffled intake noise can be made by means of the frequency-domain transfer matrix method before a detailed design is taken up.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media