DEVELOPMENT OF METHODS FOR CONTROL OF VIBROACOUSTIC QUALITIES IN BLOCK-CASES OF Y-SIMILAR INTERNAL COMBUSTION ENGINES WITH USE OF CAD

The work covers the Y-similar internal combustion engine (ICE) and its parts - block-case and crankshaft. The aim is to develop the methodical support for modelling of the case parts in the engines of Y-similar arrangement for investigation of their vibrating properties for a purpose of decreasing structural noise in ICE. The methods for development of the generalized models for block-case, crankshaft and system of these parts of the Y-similar ICE have been created. The frequencies and forms of the natural vibrations in parts of the ZIL-645 Diesel engine have been determined and systematized. The influence of a number of the cylinders on the vibrating characteristics of ICE has been investigated. The methods evaluating the noise caused by an external surface of ICE have been developed. The methods and results of experimental and designed works have been handed up to the likhachyev Automobilt Works (ZIL) for operational development of ZIL Diesel engines according to the vibroacoustic characteristics and are used in the educational process and in researches of the Moscow Autumobile-Road Institute. The methods for development of the generalized models of ICE parts can be used at numerical investigation of the vibrating properties in parts at operational development of ICE according to the acoustic indices. The results on the systematization of the natural vibration forms enable to develop the ICE parts taking special features in each of them into consideration. The software package on the evaluation of the acoustic activity of forms provide the forecasting in level of the noises created by themAvailable from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio