Pengembangan Sistem Akuisisi Data Digital Berbasis Android melalui Retrofitting Instrumentation pada Alat Direct Shear Test Konvensional
DOI:
https://doi.org/10.29103/tj.v16i2.1443Keywords:
Direct Shear Test; retrofitting instrumentation; digital data acquisition; Android; shear strength analysisAbstract
Abstrak
Pada konfigurasi DST konvensional yang digunakan, pembacaan instrumen dan pencatatan data masih dilakukan secara manual yang berpotensi menimbulkan kesalahan pembacaan dan transkripsi serta membatasi pengelolaan data secara terintegrasi. Penelitian ini bertujuan mengembangkan dan mengevaluasi sistem akuisisi data digital berbasis Android melalui pendekatan retrofitting instrumentation pada alat DST konvensional tanpa mengubah mekanisme utama dan prosedur dasar pengujian. Sistem mengintegrasikan instrumen digital, unit akuisisi, dan aplikasi Android untuk mendukung akuisisi otomatis, visualisasi, penyimpanan, analisis, dan pelaporan data pengujian. Evaluasi dilakukan pada tiga tingkat tegangan normal, yaitu 9,80; 19,60; dan 29,40 kPa, dengan perubahan perpindahan horizontal 0,01 mm sebagai pemicu akuisisi dan pencatatan konvensional setiap 0,10 mm sebagai titik pembanding. Hasil menunjukkan MAPE sebesar 0,993%, MAE 0,411 N, RMSE 0,507 N, dan 0,9996. Analisis Mohr–Coulomb menghasilkan kohesi 11,75 kPa dan sudut geser dalam 21,88°. Sistem menunjukkan perbedaan relatif yang rendah dan hubungan linear yang kuat antara hasil akuisisi digital dan pencatatan konvensional.
Kata kunci: Direct Shear Test; retrofitting instrumentation; akuisisi data digital; Android; analisis kuat geser.
Abstract
In conventional Direct Shear Test (DST) setups, instrument readings and data recording may still be performed manually, potentially introducing reading and transcription errors and limiting integrated data management. This study aimed to develop and evaluate an Android-based digital data acquisition system using a retrofitting instrumentation approach for conventional DST equipment without modifying its main mechanism or basic testing procedure. The system integrates digital instruments, an acquisition unit, and an Android application to support automated data acquisition, visualization, storage, analysis, and reporting. Evaluation was conducted at three normal stress levels of 9.80, 19.60, and 29.40 kPa, using a 0.01 mm horizontal displacement change as the acquisition trigger and conventional recording at 0.10 mm intervals for comparison. The results showed a MAPE of 0.993%, MAE of 0.411 N, RMSE of 0.507 N, and of 0.9996. Mohr–Coulomb analysis yielded a cohesion of 11.75 kPa and an internal friction angle of 21.88°. The system showed low relative differences and a strong linear relationship with conventional records.
Keywords: Direct Shear Test; retrofitting instrumentation; digital data acquisition; Android; shear strength analysis.
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