| Abstract [eng] |
In recent decades, strongly intensified traffic significantly increased environmental noise problems in cities and rural areas. Noise mapping is one of the measures to implement provisions of Law on Noise Control of the Republic of Lithuania. The main aim of the Master’s thesis is to investigate problems of transport noise and to carry out cartographic researches of the selected street noise spread and to create methodology for noise spread prognostication. Various methods were used in the thesis: a theoretical and historical analysis, statistical methods, object classification, data collection, comparison and systematic analysis, and formulation of conclusions. The thesis consists of an introduction, three parts, conclusions and suggestions, references, summary in Lithuanian and English, as well as annexes. In this thesis, level of noise of light-duty vehicles up to 3.5 t and heavy-duty vehicles over 3.5 on roads with asphalt, gravel and paving coverings was investigated. The minimum measures were used to carry out the research: a mobile phone Sony Z5 with the installed application ‘Sound meter’ to measure the noise level. The literature review first introduces to the physical acoustic parameters, damage caused by the car noise and preventive measures, noise regulation in Lithuania and Europe. Works related to the topic of the research of other researchers, schemes of their works and results are provided. In section of work methodology, a range of devices available to carry out researches, the software used, reporting techniques are comprehensively analysed. The process of the researches carried out, the used devices, the most important parameters of the work, mapping schemes are described. The section of results consists of four parts. The first part provides results of the car noise in different conditions. The second part provides analysis of the vehicle test results using graphs, charts and diagrams on the map. The third part indicates the size - noise stimulation indicator, the formula of its calculation and provides the necessary data and parameters for calculation of the stimulation indicator. Schemes of acoustic reflection and prognostication mapping are provided. The fourth part indicates sizes of coefficients affecting stimulation indicator. Methodology for the noise prognostication is developed. |
