Bida D. Methods of calculating sound insulation of multilayer structures

The dissertation work is devoted to the research of methods of calculating the sound insulation of building structures and the influence of materials of multilayer structures on the qualitative indicators of sound insulation. In the first chapter, the importance of soundproofing in private life is given. General data on the types of noise and the ways of noise transmission through the construction of buildings are given. Examples of typical materials for sound insulation and vibration insulation are given. Practical examples of the use of such materials in the process of sound and vibration insulation of various objects are presented. Examples of effective and up-to-date methods of calculating the sound insulation of thin sheet materials, homogeneous massive fences, and multi-layered enclosing structures without a layer of sound-insulating materials are given. The second chapter provides an analytical (calculation) method for determining the sound insulation index of homogeneous panels, multilayer structures and multilayer structures with fasteners. The given calculation algorithm using the existing Insul software. The method of conducting experimental studies of air noise isolation by enclosing structures is presented. The results of natural experiments and data obtained with the help of Insul are presented. A comparative analysis of data obtained by experiments and obtained with the help of Insul was carried out. In the third chapter, the methodology of conducting experimental studies, requirements for measuring equipment and measuring premises are given. Experimental data and data from natural measurements of objects are given. Namely, the results of studies of massive enclosing structures, massive structures with various types of cladding are presented. The research data of structures with different thicknesses of the sound-absorbing layer and different number of layers of sound-insulating cladding are presented. The dependence of the sound insulation values of the structure on the thickness of the sound-absorbing layer and on the number of layers of sound-insulating cladding was analyzed. The fourth chapter presents a new method of calculating the sound insulation of multilayer structures. The complete algorithm for calculating the index of air noise insulation by building enclosing structures is described. A graphical and tabular comparison of experimental research data, data obtained using the Insul software, and the proposed methodology is provided. The accuracy of the methods was assessed. The new theoretical and practical results presented in the dissertation can be recommended for use in the development of national construction standards, the design of construction objects for various purposes, as well as in the educational process of higher educational institutions of Ukraine for the training of acoustic engineers.