Pengembangan Sistem Akuisisi Data Peak Particle Velocity dengan Multi-Station Triaxial Geophone Sensor

Manalu, Medlyn Karin (2024) Pengembangan Sistem Akuisisi Data Peak Particle Velocity dengan Multi-Station Triaxial Geophone Sensor. Diploma thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penelitian ini menganalisis kinerja sistem akuisisi data seismik multi-stasiun dengan sensor geophone triaksial 4,5 Hz yang terdiri dari komponen Vertikal (Z), Timur-Barat (E), dan Utara-Selatan (N). Sistem ini menggunakan Graphical User Interface (GUI) untuk memantau Peak Particle Velocity (PPV) akibat adanya ground vibration. Percobaan dilakukan di Laboratorium Teknik Geofisika ITB dengan menggunakan sumber getaran buatan aktif berupa sledge hammer, dalam medium homogen dengan rasio kecepatan gelombang p-s sebesar 0.247 m/s. Jarak sumber getaran divariasikan hingga 15 meter, dengan pengulangan tiga kali untuk setiap jarak. Sistem yang telah dikembangkan ini kemudian dibandingkan dengan instrumen geophone 5 Hz komersial. Analisis dilakukan dalam domain waktu dengan mengabaikan domain frekuensi. PPV dihitung sebagai jumlah vektor amplitudo puncak dari setiap komponen, sementara jarak sumber dan penerima dihitung dengan mengurangi waktu kedatangan gelombang p dan s. Hasil menunjukkan akurasi pengukuran PPV sebesar 94.88% pada Stasiun 1 dan 95.2% pada Stasiun 2, dengan peningkatan akurasi menggunakan Multi-Station Triaxial Geophone sebesar 97.24%. Akurasi pengukuran jarak sumber getaran adalah 98.59%. Sensor di setiap stasiun mampu mengukur nilai PPV dengan delay time 71 ms (sensor Z), 83 ms (sensor E-W), dan 67 ms (sensor N-S), yang memenuhi standar ITU-T. Data menunjukkan korelasi antara jarak sumber getaran dan nilai PPV, dengan koefisien korelasi (R2) sebesar 0.8535 pada Stasiun 1 dan 0.8213 pada Stasiun 2. Temuan ini memvalidasi kemampuan instrumen yang telah dikembangkan serta menawarkan alternatif yang dapat diandalkan terhadap solusi intrumen komersial yang sudah ada. Penelitian ini memberikan kontribusi pada bidang rekayasa geofisika dengan menyediakan metode yang hemat biaya dan akurat untuk memonitor getaran tanah, yang penting untuk berbagai aplikasi termasuk studi seismik dan pemantauan infrastruktur.
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This research presents a performance analysis of a novel development of multi-stations seismic data acquisition system. This system involves 4.5 Hz triaxial geophone sensors — Vertical (Z), East-West (E), and North-South (N) — and a user-friendly Graphical User Interface (GUI) for monitoring peak particle velocity (PPV) in the ground and estimating the distance of a vibration source. The experiment was conducted by employing an active artificial vibration source at a certain location by assuming a homogeneous medium with the specific p-s waves velocity (0.2471 m/s). The distance of the vibration source was varying up to 15 meters, and each test was repeated three times. This data acquisition system has already been compared to the commercial high-end 5 Hz geophone instrument. Since this research only analyzes parameters in the time domain, therefore neglecting the frequency domain. PPV was determined by the sum vector of peak amplitude in each component. Meanwhile, the distance between source and receiver was calculated by subtracting p-wave and s-wave first break arrival time. Results showed a PPV measurement accuracy of 94.88% at Station 1 and 95.2% at Station 2, with increased accuracy using the Multi-Station Triaxial Geophone of 97.24%. The accuracy in measuring the distance of the vibration source was 98.59%. Sensors at each station were able to measure PPV values with delay times of 71 ms (Z sensor), 83 ms (E-W sensor), and 67 ms (N-S sensor), which met ITU-T standards. The data indicated a correlation between the vibration source distance and PPV values, with a correlation coefficient (R2) of 0.8535 at Station 1 and 0.8213 at Station 2.These findings validate the novel developed instrument’s capability, offering a reliable alternative to existing commercial solutions. This research contributes to the field of geophysical engineering by providing a cost-effective and accurate method for monitoring ground vibrations, which is crucial for various applications including seismic studies and infrastructure monitoring.

Item Type:	Thesis (Diploma)
Uncontrolled Keywords:	Blast-induced ground vibration, geophone, peak particle velocity, seismic data acquisition
Subjects:	Q Science > QC Physics > QC100.5 Measuring instruments (General) Q Science > QE Geology > QE538.5 Seismic tomography; Seismic waves. Elastic waves
Divisions:	Faculty of Vocational > Instrumentation Engineering
Depositing User:	Medlyn Karin Manalu
Date Deposited:	04 Sep 2024 07:44
Last Modified:	04 Sep 2024 07:44
URI:	http://repository.its.ac.id/id/eprint/110682

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