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Journal : Journal of Engineering and Applied Technology

Building settlement measurement system and reporting on LabVIEW-based soil liquefaction simulator Pratama, Bagas Adha; Zahrah, Dian Fajria; Setiowati, Sulis
Journal of Engineering and Applied Technology Vol. 5 No. 2 (2024): (August)
Publisher : Faculty of Engineering, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jeatech.v5i2.65486

Abstract

A one-axis shaking table soil liquefaction simulator is utilized to study soil behaviour and characteristics, enabling efforts to mitigate liquefaction-indicated soil behaviour. Traditionally, the process of measuring and documenting building settlement, which is a soil variable that indicates liquefaction, involves the use of a pen, paper, and measuring instrument. Therefore, build a measurement system consisting of LVDT displacement sensors and NI cRIO-9025 as the main components, along with LabVIEW software as a novel medium to acquire, process, display, and record measurement data to provide increased measurement accuracy equivalent to traditional instruments. The soil used as material in the test was represented by silica sand with a density percentage of 40-70%. By utilizing the measurement system uses a linear regression scaling method with a sampling time implemented during testing with 100 ms or 10 data/second and descriptive statistical analysis, the soil liquefaction simulator achieves precision with an average measurement error of ±0.89 mm and a reporting operational time efficiency rate of 95.80%. Thus, the accuracy rate of the simulator with the method used in the system is 96.31%.
Soil liquefaction measurement and adjustment system on shaking table for seismic simulation Abdul Karim, Mahmud; Aulia Sakinah, Dea; Nugroho Nuradryanto, Dimas; Setiowati, Sulis; Novita Wardhani, Rika; Salimah, A'isyah; Yelvi, Yelvi
Journal of Engineering and Applied Technology Vol. 5 No. 1 (2024): (March)
Publisher : Faculty of Engineering, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jeatech.v5i1.65479

Abstract

The liquefaction simulator tool uses a one-axis shaking table model to determine soil features and behaviour that indicate liquefaction. This helps in implementing measures to mitigate its effects. The research system incorporates a frequency regulation system to control the speed of the 3-phase motor and a measurement system that monitors various variables associated with liquefaction. The variables include displacement, rocking table motion, acceleration, vibration frequency, and pore water pressure. This study used LabVIEW for frequency adjustment, data acquisition, processing, and presentation. LabVIEW improved the observations' accuracy using the linear regression method and descriptive statistical analysis at the data processing stage. The error value for the frequency adjustment without load was 1.65%, which increased to 8.75% when a load was applied. This study achieved a displacement measurement accuracy of 99.03% and an average pore water pressure measurement accuracy of 95.69%. The measurement accuracy of the accelerometer and accelerometer vibration frequency reached 66.98%.