Suyatno, Suyatno
Institut Teknologi Sepuluh Nopember

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Analysis of Onstage Acoustics Preference of Musicians of Traditional Performance of Javanese Gamelan Based on Normalized Autocorrelation Function Suyatno, Suyatno; Tjokronegoro, Harijono A.; Merthayasa, I Gede Nyoman; Supanggah, Rahayu
Journal of Engineering and Technological Sciences Vol 48, No 5 (2016)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1531.605 KB) | DOI: 10.5614/j.eng.technol.sci.2016.48.5.5

Abstract

On-stage sound field analysis of a traditional performance of the Javanese gamelan at Pendopo ISI Surakarta, Indonesia was conducted by analyzing the effective decay time of a normalized autocorrelation function called tau-e, τe , during a performance of the Gambyong Pare Anom dance. The parameter tau-e is used to describe the richness of the frequency content, tempo, and types of gamelan instruments being played at a certain time and position on stage. The tau-e parameter is important for musicians in order to maintain communication between each other such that they can keep the performance in harmony. In order to determine the acoustic parameters heard by gamelan musicians on stage, sound measurements were conducted at 4 points on stage during a performance. Each position represents a specific group of gamelan instruments, which have different characteristics of loudness and frequency, different functions and different ways the instruments are played. The analysis showed that each of the four positions had a different value of τe , which fluctuated throughout the performance. Overall, the dominant τe at position 1 was 20 ms; at position 2 it was 50 ms; at position 3 it was 20 ms; and at position 4 it was 40 ms. The distribution of τe on the stage shows that positions 1 and 3 had more frequency richness compared to positions 2 and 4.
Analisis Kebisingan Arus Lalu Lintas terhadap Kegiatan Belajar Mengajar (KBM) di SMA Swasta Surabaya Indrawati, Susilo; Santika, Beta Bayu; Suyatno, Suyatno
Jurnal Fisika dan Aplikasinya Vol 13, No 1 (2017)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (429.707 KB) | DOI: 10.12962/j24604682.v13i1.2131

Abstract

Kebisingan yang terjadi di kehidupan sehari-hari umumnya berasal dari industri, kereta api, pesawat terbang, dan lalu lintas jalan raya. Namun dewasa ini, jalan raya adalah sumber utama kebisingan. Hal ini dikarenakan kebisingan dari jalan raya memiliki dampak yang menyeluruh, sementara yang lain hanya bersifat lokal yang artinya hanya pada daerah-daerah tertentu. Aktivitas manusia baik di luar maupun di dalam bangunan pada area yang berdekatan dengan jalan raya, sangatlah potensial menjadi korban kebisingan. Kebisingan akan berakibat menurunnya mendengar dan turunnya konsentrasi belajar pada anak. Sekolah khadijah merupakan salah satu sekolah yang sangat terganggu dengan adanya kebisingan arus lalu lintas. Letak sekolah yang langsung berhadapan dengan jalan raya sangat menimbulkan kebisingan. Dari hasil pengukuran tingkat tekanan bunyi (SPL) kebisingan yang diakibatkan arus lalu lintas mencapai 87 dB. Besarnya NC (Noise critera) diarea parkir sekolah mencapai 78 dB, sedangkan di area dalam sekolah Nilai NC mencapai 70 dB . Padahal menurut baku tingkat kebisingan untuk sekolah adalah 55 dB. Berdasarkan analisis nilai noice reduction (NR) pada muka dinding ruang kelas di SMA Swasta Surabaya yang diperoleh cukup bagus, tapi perlu untuk melakukan beberapa perbaikan, pertama adalah pemberian bahan isolasi di lorong/ depan yang berhubungan langsung dengan sumber kebisingan. Perbaikan yang kedua adalah dengan  perbaikan pada engsel pintu dan celah jendela yangcukup besar.ABSTRACTNoise that we experienced daily are mainly caused by industry, train, plane, and traffic activity. Nowadays, traffic are the min cause for noise, because the noise caused by traffic have systemic cause, meanwhile other source of noise are rather local. Anyone that have activity whether its outside or inside a building near a traffic dense road will be affected by the noise. Noise will affect to the deteriorating of the hearing and child concentration. Khadijah school is one of the school that heavily affected by traffic noise. The school sit near a heavy traffic road, which caused a lot of noise. From the sound pressure level (SPL), the noise caused by the traffic reached 87 dB. The noise criteria (NC) in the parking area of the school reach 78 dB, while inside the school the NC reach 70dB. While according to some research and regulation, the NC in school area should be around 55dB. By analyzing the faade of the classroom wall, its found that the wall have great noise reduction. The faade is made from double wood door with 3cm thickness, 3mm glass windows, and brick wall with 10cm thickness. The material used in the building are up to standard, but it need some adjustment. The first adjustment should be adding an insulation material on the hallway that connected directly to the noise source the second adjustment should be minimalizing the gap in the door and windows by using a rubber so that the noise couldnt pass through the gap.
Desain dan Pengembangan Fluxgate Magnetometer dan Beberapa Aplikasinya Suyatno, Suyatno; Djamal, Mitra; Yulkifli, Yulkifli; Setiadi, Rahmondia N.
Jurnal Fisika dan Aplikasinya Vol 4, No 1 (2008)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (127.322 KB) | DOI: 10.12962/j24604682.v4i1.947

Abstract

Telah dilakukan pembuatan dan pengembangan sensor magnetic fluxgate yang terdiri dari dua buah probe, berupa kumparan eksitasi, kumparan sekunder (pick-up) dan inti terbuat dari bahan vitrovac. Dengan menggunakan metode harmonisa kedua, penggunaan sensor ini adalah untuk mengukur besarnya medan magnetik, pengukuran arus pada penghantar dan pengukuran jarak. Pada pengukuran medan magnet didapatkan nilai pengukuran B hingga 20 nT dengan sensitifitas 533,94 mV/μT, dengan kesalahan absolut 200 mV dan kesalahan relatif 2,76%, sedang untuk pengukuran jarak, sensor ini mampu melakukan pengukuran jarak sampai pada jarak 13,8 mm dengan resolusi sampai pada 10 μm dan kesalahan absolut 0,16 mm serta kesalahan relatif sebesar 3,4%.