IDENTIFICATION OF VIBROACOUSTIC ENERGY PROPAGATION PATHS AS THE BASIS OF METHODS OF DECREASING NOISE LEVELS IN HYDRAULIC EXCAVATORS DURING THEIR OPERATIONS

摘要

In spite of the fact that standardising operations and increased awareness of hazards led to a significant improvement of vibroacoustic climate of operator's stands of new machines, their long-term exploitation - often under difficult conditions - leads to a fast degradation of acoustic qualities of machines. Temporary operations, performed during surveys and periodical overhauls are rarely effective, due to the lack of any guidelines. In this situation the authors propose the algorithm - of selection of eventual screens or sound absorbing and sound insulating partitions - utilizing the measuring procedure of an identification at the operator's stand, of main noise components originated from various sources. On the basis of this procedure the vibroacoustic energy propagation path in the machine was estimated.