Building Acoustic

The Improvement of Floor Impact Sound Reduction by Using Covering and Damping Material of Wooden Flooring

For the increasing demand of living environment quality, the capability of building structures applied for resisting floor impact sound is highly valued recently. Floor impact sound has been taken into consideration in the standard published by authorities in Taiwan, both Residential Performance Evaluation System and Green Building Assessment Manual.

In Taiwan, most congregate housing are RC-structured. Many researches indicate that the effect of thickening the RC-structured floor to decrease the floor impact sound appears limited, while using covering and damping materials can reduce floor impact sound efficiently. A comparison analysis was performed on the wooden flooring with self-manufactured damping pads in order to identify the pads with the best impact absorbing effect. The self-manufactured damping pad, primarily made from recycled rubber grain, glass wool and polyester, is glued by polyurethane which regards as a rubber particle composite pad. The result shows that the composite pad consisting of both low rigidity and high rigidity materials can reach a better sound insulation performance of floor impact sound, for the former provides flexibility created by porosity and the latter offers structure.

Floor impact sound test schematic diagramNew-type wooden flooring structure schematic diagramThe sound reduction level of rubber particle composite pad applies to new-type wooden flooring structure (ΔL )

Floor Impact Sound

An acoustic condition in residential units has always been a vital research issue. There are even many cases that resort to litigation for floor impact sound trouble in congregate housing recently.  Ministry of the Interior, Taiwan has implemented the practically operation of managing and upgrading acoustic condition in residential units, as it has upgraded the impact sound reducing performance requirements of floor materials in regulations such as Housing Act and Indoor Target of EEWH. The study is conducted by on-site measurement and experiments in laboratories on floor materials’ acoustic performance of different components including finishing parts, resilient parts, structure parts.

Below are ongoing projects:
[1] Improvement extent measurement for floor impact sound reduction of resilient materials.
[2] Resilient measurement and database establishment of absorptive building materials.
*The project is operating associated with Professor Fang-ming, Lin from National Pingtung University of Science and Technology and Professor Sung-Chin, Chung National Yunlin University of Science and Technology.

Small sample tested by standard tapping machineSound transmission class measurement with floor impact sound of different Octave Band

Noise Generated From Drain Pipes

Nowadays, quite, comfortable, and healthy residential space has been increasingly valued as the living quality rises. According to domestic aiming studies, a lot of residents are disturbed by noise generated from drain pipes which is one of the main problems of water supply and drainage system devices in existing buildings.

However, referring to the above, chase and lavatory architectural design in our country has yet been improved which catch our attention. The lab studies the issue by on-site measurement on the basis of ISO 16032, which was launched on 2004 stating the standard of noise on-site measurement for all kinds of service devices in a building, intent to clarify the key problem with efficiency, analyze it and provide improving strategies.

Below are ongoing projects:
[1] Existing noise problem studies on water supply and drainage device and drain pipes in residential units.
[2] Management for noise problem with water supply and drainage device in residential units.
*The project is operating associated with Professor Fang-ming, Lin from National Pingtung University of Science and Technology

Comparison of noises generated by open-conduit, covered-conduit, and the circumstanceMeasurement results of different kinds of noise

Fireproof Soundproof Door

In Taiwan, wooden door and fans often appear in general single room, restaurants, business offices and other places. In the field of acoustics, the performance of sound insulation performance is not outstanding because of material properties of wood. This research cooperate with Ping Shen Enterprises Company Ltd, to develop multiple sets of test pieces, conduct Sound intensity method and Sound pressure method for 1:1 building components sound insulation performance test in the TAF certified ISO 17025 laboratory, then improve the sound insulation performance of wooden fire door fans.

Reverberant Chamber schematicPractical work in the chamber