Purwanto, Fery Dwi (2019) Analisis Perubahan Dimensi Terhadap Kinerja Speaker Dodecahedron. Other thesis, Institut Teknologi Sepuluh Nopember.
Preview |
Text
02311540000021-Undergraduate_Theses.pdf Download (3MB) | Preview |
Abstract
Vibrastic Dodecahedron (V-Dec) merupakan loudspeaker yang digunakan dalam pengukuran akustik ruang. Pada penelitian sebelumnya telah dibuat V-Dec dengan tiga variasi dimensi antara lain V-Dec generasi pertama dengan dimensi enclosure speaker 15 cm, V-Dec generasi kedua dengan dimensi enclosure speaker 13 cm dan V-Dec generasi ketiga dengan dimensi enclosure speaker 9 cm. Pada tugas akhir ini dilakukan analisis terhadap parameter directivity, respon frekuensi dan sound pressure level untuk mengetahui perubahan kualitas kinerja V-Dec yang diakibatkan oleh perubahan dimensi. Directivity V-Dec dilihat dari nilai omnidirectional cut-off frequency yang menunjukkan batas frekuensi yang memiliki omnidirectional directivity. V-Dec memiliki omnidirectional cut-off frequency dengan rentang nilai 500 Hz – 630 Hz pada V-Dec generasi pertama, 630 Hz – 800 Hz pada V-Dec generasi kedua dan 800 Hz – 1000 Hz pada V-Dec generasi ketiga. Respon frekuensi yang dimiliki oleh V-Dec semakin tidak flat seiring dengan semakin kecilnya dimensi V-Dec. Dan nilai sound pressure level yang mampu dibangkitkan oleh V-Dec semakin rendah seiring dengan semakin kecilnya dimensi V-Dec. Berdasarkan hasil analisis menunjukkan adanya displacement yang besar pada cone speaker saat V-Dec membangkitkan suara dengan frekuensi rendah. Hal ini membuat nilai sound pressure level yang dibangkitkan oleh V-Dec menjadi semakin rendah. Untuk menanggulangi hal tersebut dilakukan dengan cara menambah radius driver speaker yang digunakan atau dengan cara mengganti driver speaker dengan driver speaker yang memiliki tingkat kekakuan yang lebih kecil. =================================================================================================================================
Vibrastic Dodecahedron (V-Dec) is a loudspeaker that can be used on room acoustic measurement. On the previous final project, there had been produced V-Dec with three dimension variations, there are V-Dec first generation with 15 cm enclosure, V-Dec second generation with 13 cm enclosure and V-Dec third generation with 9 cm enclosure. In this final project, an analysis of directivity, frequency response and sound pressure level is carried out to know about changes in performance due to dimensional change. V-Dec’s directivity is measured using value of omnidirectional cut-off frequency, that can show limit of frequency which has omnidirectional directivity. First generation of V-Dec has omnidirectional cut-off frequency with interval 500 Hz – 630 Hz, second generation of V-Dec has omnidirectional cut-off frequency with interval 630 Hz – 800 Hz and third generation of V-Dec has omnidirectional cut-off frequency with interval 800 Hz – 1000 Hz. V-Dec’s frequency response is getting worse with smaller dimension. V-Dec’s sound pressure level is getting lower with smaller dimension. Cone speaker will has higher displacement when V-Dec is producing sound with low frequency. This condition makes value of V-Dec’s sound pressure level decrease. This problem can be fixed with two method there are adding radius of the driver speaker or changing the driver speaker with small stifness.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | v-dec, omnidirectional cut-off frequency, displacement |
| Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7871.58 Audio amplifiers--Design and construction. |
| Divisions: | Faculty of Industrial Technology > Physics Engineering > 30201-(S1) Undergraduate Thesis |
| Depositing User: | Fery Dwi Purwanto |
| Date Deposited: | 24 Sep 2024 05:52 |
| Last Modified: | 24 Sep 2024 05:52 |
| URI: | http://repository.its.ac.id/id/eprint/70425 |
Actions (login required)
 |
View Item |