Study on compatibility of reduction transmitted impact sound of dry-type floating floor due to car-tire source and rubber ball source

Abstract

In Japan, JIS A 1418-2:2019 specifies the car-tire with impact force characteristics (1) and the rubber ball with impact force characteristics (2) as standard heavy impact sources. It has also been reported that the reduction of transmitted impact sound for a dry-type floating floor differs depending on the impact sources of the car-tire and the rubber ball. It has been reported that one of the reasons for different reduction of transmitted impact sound is excessive the car-tire impact force, and a tendency for a nonlinear response to impact force for a dry-type floating floor. Meanwhile in inter.noise 2022, It was also suggested that the reduction of transmitted floor impact sound level of the rubber ball could be estimated from the reduction of transmitted floor impact sound level of the car-tire by considering excitation frequency characteristics. In this paper, a consideration was conducted using the impact force exposure level of the impact source as a method of correcting the excitation frequency characteristics. Also, the results on the comparison of reduction transmitted impact sound using the A-weighted sound pressure level are described.