SOFTWARE COMPLEX FOR CALCULATING VIBROACOUSTIC CHARACTERISTICS ― A TOOL USED WHEN CREATING ENGINEERING STRUCTURES

摘要

At the present stage of computer developments the possibilities of a new solution of a problem for creating complicated engineering structures (ES) required meeting specified vibroacoustic characteristics (VAC) have appeared. This work offers to solve this problem during design, construction and delivery of engineering structures by using software complexes for calculating vibroacoustic characteristics of these structures and developing an optimum acoustic protection scheme based on a modular design. The system of modular software complexes enables to determine by calculation: 1. total VAC levels in monitored points, which are caused by all sources of vibration, for any operation mode of this structure: 2. the optimum acoustic protection scheme of an ES, which, when incorporated, will enable to meet specified requirements for ES VAC, with a minimum weight or cost. The software complex for ES VAC calculation, based on a modular design, may be developed only when using various methods for calculating propagation of elastic waves across elements of engineering structures. These methods include: 1. finite-element method; 2. boundary-element method and its modification ― a method of finite wave elements; 3. energy statistics method.