Building with cross laminated timber (CLT) has gain increased interest over the last years, but in common to other wood-based building systems, inadequate low-frequency sound insulation is seen as a problem. This paper deals two methods improve of CLT panels, normally made from spruce: 1) heavy CLT, introducing compressed, i.e. densified, spruce well alternative wood species, and 2) elastic lay...

This study investigates the effects of the factors extracted from the autocorrelation function (ACF) and the interaural cross-correlation function (IACF) on annoyance of heavy-weight floor impact sound. First, heavy-weight floor impact sound was measured in rooms of apartments which have different sound insulation treatments and characterized by the ACF and IACF factors. Then, paired comparison...

ABSTRACT New recommendations for environmental noise levels have been issued in Sweden. The permissible levels at facades of new buildings have been increased, which has resulted in a risk for higher indoor low frequency noise levels, since the recommended indoor levels are A-weighted. The additional Swedish low frequency third octave band requirements might be violated. Therefore, there is a n...

Over the last few years, customer demands regarding acoustic performance, along with the tightening of legal regulations on noise emission levels and human exposure to noise, have made the noise and vibration properties into important design criteria for agricultural machinery cabins. In this framework, both experimental analysis procedures for prototype testing as well as reliable numerical pr...

In inspecting steel-rubber multi-layered structure, shielding of steel layer and intense attenuation of rubber layer result in ultrasonic echo from the interfaces of the deep layers being very weak. In order to overcome the difficulty, the double mode testing method is put forward. This method synthesizes the characteristics of transverse wave and Lamb wave testing. In the double modetesting tr...