Studi Eksperimental Dan Simulasi Respons Getaran Pada GVWT Terhadap Debit Aliran Dan Konfigurasi Dual-Stage Runner

Santoso, Sagar Atha Wira (2026) Studi Eksperimental Dan Simulasi Respons Getaran Pada GVWT Terhadap Debit Aliran Dan Konfigurasi Dual-Stage Runner. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Gravitational Vortex Water Turbine (GVWT) merupakan pembangkit mikrohidro yang memanfaatkan pusaran air pada kondisi head rendah. Penelitian ini menganalisis pengaruh debit aliran dan posisi dual-stage runner terhadap kinerja energi serta respons getaran melalui pengujian eksperimen dan simulasi MATLAB-Simulink. Variasi penelitian meliputi debit 39,375 L/s, 52 L/s, dan 58,125 L/s serta posisi runner atas 0,11 m, 0,21 m, dan 0,31 m. Parameter yang diukur meliputi RPM, tegangan, arus, serta percepatan getaran sumbu X dan Y. Hasil penelitian menunjukkan bahwa peningkatan debit secara umum meningkatkan RPM, daya listrik, dan daya mekanik. Daya mekanik tertinggi sebesar 74,81 W diperoleh pada posisi 0,31 m dan debit 58,125 L/s, sedangkan efisiensi tertinggi sebesar 34,42% diperoleh pada posisi 0,21 m dan debit 52 L/s. Resultan RMS percepatan getaran tertinggi mencapai 3,723 m/s² pada posisi 0,31 m dan debit 58,125 L/s. Hasil FFT menunjukkan frekuensi dominan pada rentang 7,226–69,238 Hz, sedangkan validasi simulasi menghasilkan rata-rata error 6,79%. Berdasarkan keseimbangan kinerja energi dan getaran, konfigurasi terbaik diperoleh pada posisi runner 0,21 m, debit 58,125 L/s, dan beban lampu 4, dengan daya mekanik 66,01 W, efisiensi 33,31%, dan resultan RMS 2,618 m/s².
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Gravitational Vortex Water Turbine (GVWT) is a micro-hydropower system that utilizes a water vortex under low-head conditions. This study analyzes the effects of flow rate and dual-stage runner position on energy performance and vibration response through experimental testing and MATLAB-Simulink simulation. The tested flow rates were 39.375 L/s, 52 L/s, and 58.125 L/s, with upper-runner positions of 0.11 m, 0.21 m, and 0.31 m. The measured parameters included rotational speed, voltage, current, and vibration acceleration along the X and Y axes. The results show that increasing the flow rate generally increases rotational speed, electrical power, and mechanical power. The highest mechanical power of 74.81 W was obtained at a runner position of 0.31 m and a flow rate of 58.125 L/s, while the highest efficiency of 34.42% was achieved at 0.21 m and 52 L/s. The highest resultant RMS vibration acceleration was 3.723 m/s² at a runner position of 0.31 m and a flow rate of 58.125 L/s. FFT analysis identified dominant frequencies within 7.226–69.238 Hz, while simulation validation produced an average error of 6.79%. Considering both energy performance and vibration response, the best configuration was obtained at a runner position of 0.21 m, a flow rate of 58.125 L/s, and lamp load 4, producing 66.01 W of mechanical power, 33.31% efficiency, and a resultant RMS of 2.618 m/s².

Item Type:	Thesis (Other)
Subjects:	T Technology > T Technology (General) > T57.62 Simulation T Technology > TA Engineering (General). Civil engineering (General) > TA355 Vibration. T Technology > TJ Mechanical engineering and machinery > TJ266 Turbines. Turbomachines (General) T Technology > TJ Mechanical engineering and machinery > TJ808 Renewable energy sources. Energy harvesting. T Technology > TJ Mechanical engineering and machinery > TJ870 Hydraulic turbines.
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Physics Engineering > 30201-(S1) Undergraduate Thesis
Depositing User:	Sagar Atha Wira Santoso
Date Deposited:	03 Aug 2026 07:31
Last Modified:	03 Aug 2026 07:31
URI:	http://repository.its.ac.id/id/eprint/141844

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