Noise prediction chart
专利汇可以提供Noise prediction chart专利检索，专利查询，专利分析的服务。并且PURPOSE: To utilize a chart as a tool, etc., for environmental control over field construction by obtaining various noise source data from measurement results and entering noise propagation calculation parts into the chart.
CONSTITUTION: At a model site, there are houses nearby housing site preparation construction in a city, and two bulldozers and one back hoe are in operation. When sound insulation countermeasures are investigated, numerals obtained by sound sources are enters into a specific calculation table. Further, the noise levels of the sound sources are corrected with -3dB for a low noise type and -10dB for an extremely low noise type. Further, the distances between the sound sources and a sound reception point are read out of respective longitudinal sections with a rule, etc. At this time, 50dBA is obtained indoors, a sound insulation wall needs to be used, and a sound insulation rank 1 is used for the sound insulation wall. In this case, the difference between the distance of a noise arriving through the wall and the distance of a noise arriving directly and a necessary route difference δ are read out of a cross section connecting the sound source and sound reception point with the rule on the chart. Thus, the sound insulation effect of each sound source is obtained, the noise becomes ≤40dBA indoors, and a complaint is eliminated.
COPYRIGHT: (C)1988,JPO&Japio，下面是Noise prediction chart专利的具体信息内容。
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