Japanese standards and situation of studies about heavy and soft impact sources

Abstract

This report describes standards of heavy and soft impact sources. They are used for measurement of floor impact sound insulation of buildings. In Japan, the method for field measurement of floor impact sound level (JIS A 1418) was revised in 2000 and separated into two parts. Part 1 uses a standard light impact source and corresponds to ISO 140‐7. Part 2 uses heavy and soft impact sources. At that time, a rubber ball was standardized along with a car‐tire source in JIS A 1418‐2. Moreover, JIS A 1440‐1 and JIS A 1440‐2 for laboratory measurement of the reduction of transmitted floor impact sound have been prepared. JIS A 1440‐1 corresponds to ISO 140‐8, and JIS A 1440‐2 uses heavy and soft impact sources. Floor impact sources characteristics are introduced. They include force characteristics, temperature dependence, stability, and others. In addition, among contents of JIS A 1440‐2, the measurement method, calculation method, and a laboratory of a box‐frame‐type reinforced concrete construction are explained. In addition, study examples using a rubber ball are introduced. As examples, we present the floor impact sound level, the transmitted floor impact sound level, hearing tests on floor impact sound, and evaluation of walking sensations.