Assessment of the sound insulation of a wood joist construction due to different types of impact sources
✍ Scribed by Shi Wanqing; Carin Johansson; Ulrik Sundbäck
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 514 KB
- Volume
- 48
- Category
- Article
- ISSN
- 0003-682X
No coin nor oath required. For personal study only.
✦ Synopsis
The IS0 standard tapping machine was speciJed as an impact source to assess the sound insulation ofj7oors. The problem is that the noise spectrum produced by the tapping machine does not give similar spectra to that produced by an actual footfall. There are not enough low frequency components in the noise spectrum generated by the tapping machine and it does not, therefore, accurately re$ect low frequency noise from the construction being measured. This study presents the impact sound power radiation from a wooden joist construction while applying diflerent impact sources, actual footfall and the standard tapping machine. The sound power radiation obtained from the construction when the tapping machine is applied contains large discrepancies when compared with measurements obtained from an actual footfall at the lower frequency. Comparison of the sound power radiation from the woodjoist construction generated by diflerent impact sources showed very good agreement between an actual footfall and a sand ball falling from a certain height. This means that the use of the sand ball drop is a better method of assessing the low frequency impact sound insulation of a construction than using the standard tapping machine.