本研究先以電腦模擬為工具，根據前期發展出之廳堂原型進行性能之初步確認，該廳堂觀眾席面積與容積各為1440m2與22000m3，舞台周邊席位約占1/4。其後建構1/20縮尺模型，第一階段先調整共五種之天花板高度與材料組合讓模型達到合理設定，並驗證電腦模擬之結果，第二階段則進行廳堂最後一排席位有無與舞台前反射面有無之比較，兩者各使用無指向性與指向性音源。
研究結果顯示，在寬度達到34 m以上的梯田廳堂中，透過錯出兩側、舞台正面與廳堂角落之梯田席位區塊，聲音強度與餘響度皆可達到合理水準，甚至具備優於一般水準之側向能量；舞台前方反射面可補強舞台周邊席位在使用指向音源時高頻音量之不足，其效果可接近3分貝；縮尺模型實驗之平均強度值略低於電腦模擬值，但測點間之離散性較小。整體成果顯現大型梯田提供優良聲學品質之可行性，並可作為設計創意性思考的參考，後續研究則可就席位區塊牆優化、舞台上方反射板、舞台席位之有無等議題做進一步探討。
關鍵字： 梯田式廳堂、電腦模擬、縮尺模型實驗、指向性音源

A vineyard hall design scheme with roughly 1/4 surrounding seats is proposed and evaluated using computer modeling as a follow-up study of previous development where the audience area and hall volume are 1440 m2 and 22000 m3, respectively. The simulation is verified using a 1/20 scale model where the volume and material is fine tuned through a series of measurements. The effect of the farthest row of seats was tested using an omni-directional source while the effect of the nearby walls in front of the stage was tested using a directional, voice source.

The results generally show reasonable strength and reverberation for a 34-m wide vineyard hall by appropriately introducing side, frontal, and corner terraces. Lateral energy fraction is superior to published average performance of large size concert halls, especially when considering the excessive width of the model hall. Near 3 dB compensation of high-frequency strength from the directional source could be derived by introducing the nearby terrace walls in front of the stage. The strength from individual seat of scale modeling is less dispersed then the data from the computer modeling although the average value from the former is weaker. The findings demonstrate the feasibility of designing a vineyard hall to fulfill well-accepted acoustical design objectives. It can also be used as a reference for the innovation process for an actual design project. Design or experimental factors such as terrace wall aiming, stage overhead reflectors, performer chairs on stage can be further optimized or studied.

Keywords: Vineyard halls, Scale modeling, Computer modeling, Directional source

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