ANALISIS PENGARUH GEOMETRI KUBAH TERHADAP KONDISI AKUSTIK MASJID A. R. FACHRUDDIN UMM MENGGUNAKAN CATT-ACOUSTIC

• Main Authors: , RIFQI IKHWANUDDIN, , Sentagi Sesotya Utami, S.T., M.Sc.,Ph.D
• Format: Theses and Dissertations NonPeerReviewed
• Published: [Yogyakarta] : Universitas Gadjah Mada 2014
• Subjects: ETD
• Online Access: https://repository.ugm.ac.id/132642/; http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=73181
• Institution: Universitas Gadjah Mada

Mosque is central building for worship activities in Islamic community. There are similarities in terms of acoustic perspective, that the whole activities within will produce sound speeches or conversations. The existence of dome in the acoustic mosque space could potentially produce concentrated distribution of the sound energy. Acoustical comfort for each activity in mosque requires speech intelligibility as well as tranquil atmosphere for concentration in worship. Acoustic parameters used are T30, C50, C80, and RASTI. The acoustical quality prediction is produced by using computer modelling CATT-Acoustic. Numerical calculations were performed based on the hybrid method. Ring structures of dome modelling are varied by its height which are 1, 2, and 3 meters, thus the scenario analysis produced 6 models. The ring structure is part of mosque ceiling. Analytical calculations are performed to investigate sound ray reflections due to variations of the dome geometry. The model analysis is based on the investigation of ��/� ratio. Dome geometry produces focusing effect by ��/� ratio 0.74, 0.83, and 0.92, respectively for models 1, 2, and 3. Means of T30 models 1, 2, and 3 for congregational prayers are 2.6, 2.4, and 0 seconds. Means of T30 models 4, 5, and 6 for Quran recitation are 2.7, 2.3, and 0 seconds. Areas near mihrab are 14 � 6 ��, includes 4 � 5 first row produces poor quality of clarity. Clarity for congregational prayers, C50 are - 4.7, -4.6, and -4.1 dB, respectively for models 1, 2, and 3. Clarity for Quran recitation, C80 are -1.3, -0.7, and -0.8 dB, respectively for models 4, 5, and 6. The results demonstrate that increasing the height of the dome structure will produced better clarity and speech intelligibility, given the smaller T30 and the higher both of C50 and C80 values. Dome analysis helps establish criteria for good acoustic in mosque or other buildings with domed ceilings.