| [摘要] |
|
台北藝術大學附屬之音樂表演空間其整體結構早於民國82年已興建完成，但延至民國90年9 |
|
月才委託設計單位針對音樂廳及各練習室進行音響性能的評估與設計。本研究主要是針對 |
|
容積約1,350m3、主要空間高度為10m其兩翼部分空間高度約為3.8m之大型管弦樂練習室進 |
| 行音響設計探討及性能評估。 |
|
大型練習室設計主要目的提供充足的餘響同時有效降低音量及早期舞台支持度，因此在室 |
| 內裝修部分設置弧形天花、樂團四周牆面設置QRD擴散材料以及位於高度6
m處的懸吊擴散 |
|
版的設計元素藉以達成此目的。同時考量樂團中樂器之指向性多為向前，並於樂團前方牆 |
|
面設置擴散材料。除此之外，尤其需特別注意降低兩翼部分其聲音能量的密度。為配合不 |
|
同樂團人數及用途，提供彈性使用練習室空間，於上方空間設置面積約80 m2之可變式吸音 |
|
材料（雙層微孔透明吸音膠片），此種吸音材料不會影響結構體並可維持室內空間之整體 |
|
性。設計初期利用電腦軟體（Odeon）模擬的方式探討各個設計因子對練習室的影響。後半 |
| 階段則使用縮尺模型(1/20)做進一步的實驗討論。 |
|
經由縮尺模型的實驗結果顯示，55張空席吸音襯墊座椅（代表60位管弦樂團樂手）沒有設 |
|
置可變吸音材料之室內環境條件下，獨奏者與相距1m的樂手間其早期舞台支持度值約–10 |
| dB；中頻帶音量強度比Barron提出之理論值少1.2
dB；餘響時間則為1.5 s 。在餘響時間 |
|
方面預期當樂團人數增加至60∼80人時餘響時間值約在1.2 s∼1.0 s之間。後續研究建議 |
|
可對大型管弦樂練習室進行完工後的現場量測，以了解大型管弦樂練習室樂團人數對室內 |
| 音響環境之影響。 |
|
| [摘要] |
| 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. |