板狀均質天花板對樓版衝擊音隔音量預測模式之建立

A FEM Prediction Model for Influence of the Well-Mixed Ceiling upon Floor Impact Sound Insulation

既有建築物中集合住宅仍為國內主要建築類型，對於垂直生活噪音的干擾，在建築物主結構體剛性不易改變之條件下，裝修材料勢必為改善噪音之最佳手段；本研究運用室內裝修的設計手法，在室內空間以板狀均質天花板構造阻隔樓版衝擊噪音直接傳遞至室內空間。研究中針對建築物室內設置不同材質之板狀天花板，探討天花板材料特性及空氣層厚度對室內空間樓板衝擊音傳遞之影響，經足尺實驗比對有限元素法（FEM）數值模擬結果，1/3 Oct.音壓級趨勢相當接近，回歸分析相關係數R=0.9067，檢驗本研究建立天花板對樓版衝擊音隔音性能預測模式之有效性。以預測式評估天花板空氣層厚度與天花板吸音特性對輕量衝擊源樓板衝擊音衰減之影響：當天花板吸音率變化時，樓板衝擊音隔音性能約可達19-21 dB；空氣層厚度變化時，則樓板衝擊音隔音性能僅達到9-11 dB；顯示板狀天花板系統可降低都市中高層建築物垂直噪音干擾。

Housing is the main type of the existed buildings in Taiwan. As it fails to do a change of building structures, to fix up a building would be the best way to solve the life noise interference. This study is on a probe into the floor impact sound insulation by well-mixed ceiling used in interior decoration, and to find the sound insulation effects of the ceiling materials and the airspace thickness between ceiling and floor slab. An effective FEM prediction model is demonstrated on the basis of the results that its trend of 1/3 Oct. SPL diagram is fitting well to the on-site experiment and the regression correlation coefficient is 0.9067. The effects of ceiling airspace thickness and sound absorptive ceiling materials upon light weight floor impact sound insulation are shown as follows: the sound insulation is about 19-21 dB by use of ceiling materials with different sound absorption coefficients, and is about 9-11 dB by change of the airspace thickness.