Acoustical Design and Evaluation of the Rehearsal Room In National Taipei University of the Arts

• Main Authors: CHI WEN-LIN, 紀雯玲
• Other Authors: Chiang Weihwa
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/71205882115634170389

碩士 === 國立臺灣科技大學 === 建築系 === 91 === Acoustical study of the music suite in Taipei National University of Arts was commissioned in September 2001 after the main structure of the building has been completed for 8 years. This paper reported the acoustics design of the 1,350-m3 orchestra rehearsal room which was also used as a recording. A 10-m high main volume was attached with two 3.8-m wide wings that were only one-story high. The principle design goal was to provide both adequate reverberation and strength of co-players. This was achieved by implementing curved ceiling tilted towards the front, QRD diffusers around the perimeters, and an array of overhead diffusers 6 m above the floor. Extra amounts of diffusers were placed on the front wall because most instruments have their stronger directivity pointed towards the audience. Special attention was also placed upon reducing the energy density in the wings. Approximately 80 m2 of Variable absorbers (2 layers of micro-perforated transparent films) was proposed to be installed in the upper sidewalls and the front wall to compensate for the variation of the ensemble size. The variable absorbers were, however, cancelled by the owner reduce the construction fees. Computer modeling using the Odeon software package was performed for acoustical analysis for preliminary design phases and scale models (1/20) were used for later phases. Based on scale model test, all design features together yielded an early support of approximately —10 dB for the solo location with 55 upholstered seats (representing a 60-member orchestra) without the variable absorbers. The measured mid-frequency strength factor was 1.2 dB less than the theoretical value based on revised diffuse theory by Barron. Reverberation times (RT) with was 1.5 s. The expected occupied RT was 1.2 s and 1.0 s for 60 and 80 piece orchestras respectively. Future study will be conducted regarding the field tuning and measurements after the completion of the building.