Chesara, Siska (2025) Karakterisasi Kebisingan Pada Kereta K1: Pemetaan Akustik, dan Identifikasi Sumber Kebisingan Mechanical Vibration Dengan Simulasi Finite Element Analysis. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Penelitian ini bertujuan untuk mengkarakterisasi kebisingan dalam ruang penumpang kereta api tipe K1 melalui pendekatan pemetaan akustik dan identifikasi sumber kebisingan mekanik menggunakan simulasi numerik berbasis Finite Element Analysis (FEA). Pengukuran tingkat tekanan bunyi (SPL) dilakukan pada kondisi dinamis di area kursi penumpang dan gangway. Hasil pengukuran menunjukkan bahwa titik dengan SPL tertinggi mencapai 83.5 dB(A), terletak di area bagian depan ruang penumpang kereta api K1 New Generation dan area spot pivot bigie. Analisis spektral menunjukkan frekuensi dominan pada rentang 250 Hz – 315 Hz, yang mengindikasikan adanya resonansi struktural serta transmisi kebisingan secara struktur-borne dari bogie ke kabin penumpang. Simulasi FEA dilakukan untuk memperoleh frekuensi alami dan bentuk mode struktur bogie, namun belum menunjukkan relevansi signifikan terhadap dominasi resonansi pada frekuensi 315 Hz, disebabkan oleh keterbatasan rentang frekuensi eksitasi simulasi. Validasi dilakukan dengan pengukuran percepatan getaran menggunakan akselerometer, yang menunjukkan nilai puncak mencapai 0.06 m/s² dan berada pada lokasi spot pivot bogie dengan nilai SPL tertinggi. Hasil ini memperkuat dugaan bahwa sumber kebisingan dominan berasal dari getaran mekanik yang ditransmisikan secara struktural, atau structure-borne noise. Penelitian ini diharapkan menjadi rujukan dalam perancangan sistem peredam dan peningkatan kenyamanan akustik dalam transportasi rel.
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This study aims to characterize the noise within the passenger cabin of the K1-type railway coach through acoustic mapping and the identification of mechanical vibration sources using a numerical approach based on Finite Element Analysis (FEA). Sound Pressure Level (SPL) measurements were conducted under dynamic conditions in both the seating area and gangway. The results revealed that the highest SPL value, reaching 83.5 dB(A), was observed near the inter-car connection and HVAC system. Spectral analysis identified dominant frequency components in the range of 250 Hz to 315 Hz, indicating structural resonance and structure-borne transmission of noise from the bogie to the passenger cabin. Modal analysis using FEA was employed to determine the natural frequencies and mode shapes of the bogie structure. However, the simulation did not exhibit significant correlation with the dominant resonance at 315 Hz, likely due to limitations in the excitation frequency range. Validation through field measurements of vibrational acceleration using an accelerometer showed a peak value of 0.06 m/s², recorded in the same area spot pivot bogie where the maximum SPL occurred. This spatial correlation strongly supports the hypothesis that the dominant noise source originates from mechanical vibration transmitted structurally as structure-borne noise. The findings of this research are expected to contribute to the development of noise mitigation strategies and the improvement of acoustic comfort in railway transportation systems.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Kebisingan Kereta Api, Sound Pressure Level, Structure-borne noise, Getaran Mekanik, dan Finite Element Analysis, Railway Noise, Sound Pressure Level, Structure-borne Noise, Mechanical Vibration, and Finite Element Analysis. |
| Subjects: | Q Science Q Science > QC Physics Q Science > QC Physics > QC221 Acoustics. Sound |
| Divisions: | Faculty of Natural Science > Physics > 45201-(S1) Undergraduate Thesis |
| Depositing User: | Siska Yulinda Chesara |
| Date Deposited: | 05 Aug 2025 00:59 |
| Last Modified: | 05 Aug 2025 00:59 |
| URI: | http://repository.its.ac.id/id/eprint/127205 |
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