| [摘要] |
|
由於電腦模型無法模擬複雜廳堂的繞射、漫射與擴散等聲學現象，而實物縮尺模型模擬能 |
| 確實反應波動行為，所以在今日仍有高度的應用價值。 |
|
本研究選擇三和國中音樂廳為對象，在廳內選擇6個測點，以雙耳量測的方法來分析實物( |
| 1/1)與模型(1/20)間之差異，並評估模型作為設計的可能性。 |
|
實驗的步驟為製作各種反射及吸音材料，將材料放置縮尺餘響室測試，並計算出各材料之 |
|
吸音係數，找出可用於1/20模型的材料。然後將材料放置1/20模型內，進行雙耳的量測。 |
|
實驗結果發現，材料R10，D3，D6，CH3，CH4的吸音係數與實物(1/1)較為相近可作為模型 |
|
材料。A、B二個測點當麥克風高度提高5公分，則直接音就不會被遮蔽。此外，實物與模型 |
|
的直接音與側向反射音，皆會受前排座位影響，在低頻部分會被吸音，這種模擬漫射、擴 |
| 散及繞射的現象在縮尺模型上是可以做到，而電腦則無法做到。 |
|
本實驗建議所測試出的材料的吸音係數，可整理成為一個資料庫。提供後者相關研究參考 |
|
。對於實驗中人頭轉頭與未轉頭之差異並未再做量測分析，後繼研究可針對此一課題加以 |
| 探討。 |
| 關鍵詞：實物1/20縮尺模型 |
|
| [摘要] |
| Previous studies suggest scale
modeling can yield reasonable results in |
| complex rooms while most of
computer molding can not accurately account for |
| diffraction and diffusion in
such rooms。 |
| This research selects the music
hall of San Ho Elementary School as a target, |
| and picks 6 testing points in
the hall, and uses both ears for measurement to |
| analyze the differences between
the actual object (1/1) and the model (1/20), |
| and evaluates the model for the
feasibility of the design. |
| The experiment procedure is
divided into: |
| 1. Prepare different kinds of
reflective and sound absorbent materials, and |
| put them in a reduced scale
lingering sound room for testing, and calculate |
| the acoustic absorption
coefficient, and find out the material applicable to |
| the 1/20 scale model. |
| 2. Put the material in the 1/20
scale model and proceed with the measuring by |
| both years. |
| The discovery of the
experimental results |
| 1. The acoustic adsorption
coefficients of the R10, D3, D6, CH3, and CH4 are |
| very close to the actual object,
which can be used as the material for the |
| model. |
| 2. When the height of the
microphone rises 5 cm at testing points A and B, the |
| direct sound will not be
sheltered. |
| 3. The direct sound and the side
reflective sound of the actual object and the |
| model will be influenced by the
seats in the front rows, and the sound of the |
| low frequency portion will be
absorbed, and this type of simulated diffusion, |
| dispersion, and reflection can
be achieved in the reduced scale model, but the |
| computer is not able to make it. |
| Suggestions：The acoustic
absorption coefficient of the material tested in |
| this experiment can be compiled
into a database, serving as a reference for |
| later relevant researches. There
is not quantitative analysis on the |
| difference between the turning
head and without turning head in the experiment, |
| and this could be a subject to
be explored in succeeding researches. |
| Key words：scale model |