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190 results on '"Widodo, Tri"'

14. Health education for preventing flour albus with personal hygiene practices of reproductive organs of female students in MAN Palangka Raya

Author

WIDIARTI, ASTRI, primary, Arifin, Syamsul, additional, Lestarisa, Trilianty, additional, Putra S, Ravenalla Abdurrahman Al Hakim Sampurna, additional, Mutiasari, Dian, additional, Widodo, Tri, additional, Veronica, Anna Marthea, additional, Toemon, Angeline Novia, additional, and Inarae, Gabriella, additional

Published
2023
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18. Experimental and numerical analysis of crack propagation material Al 2024 under spectrum load.

Author

Pramana, Nurhadi, Nurdam, Nofriyadi, Widodo, Tri, Winarno, Nur, Fithri, Rosyidi, Mohammad, Bismantoko, Sahid, Zenal, Harris, Aziz, Hassanudin, Kadir, Andi Muhdiar, and Karmiadji, Djoko Wahyu

Subjects
CRACK propagation (Fracture mechanics), NUMERICAL analysis, MATHEMATICAL models
Abstract

Theoretical analysis to predict the crack propagation of Al 2024 is required and validated by experiment. This theoretical analysis was developed through a mathematical model that is based on the development of the Paris equation. The Paris equation is used to analyze crack propagation against a constant amplitude load. In this paper, a mathematical model based on the Paris equation is developed for the load spectrum, where the effective results are obtained at stage 2 when conditions are stable. The results of the development of this mathematical model are quite promising to be used as a reference for further experiments with the same material [ABSTRACT FROM AUTHOR]

Published
2024
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24. Theoretical Experiments on Road Profile Data Analysis using Filter Combinations.

Author

Karmiadji, Djoko Wahyu, Rosyidi, M., Widodo, Tri, Zenal, Harris, Nurdam, Nofriyadi, Kadir, Andi M., Hidayat, Sofwan, Bismantoko, Sahid, Pramana, Nurhadi, and Winarno

Subjects
FAST Fourier transforms, SIGNAL filtering
Abstract

Identification of road profiles is needed to provide the input of automotive simulation and endurance testing. The analysis with estimation methods is mostly done to identify road profiles. The main goal of analysis methods is to obtain the data of vertical displacements due to road profile measurement. The acceleration data is obtained from measuring road profile by using 4 sensors of accelerometer placed on each car wheel. The measuring data is converted to be vertical displacement data by using a "double integrator", however, it is not easy to get accurate results since the signal obtained carries a lot of noise and it is necessary to design the right filter reduce the noise. In this study, the signal filtering methods reducing the noise were used Fast Fourier Transform (FFT) and Kalman Filter (KF) combination. Experiments were carried out by combining Fast Fourier Transform and Kalman Filters using an input signal with unit (volt) in the time domain. In addition, this research focused on preparing the survey data that has been obtained by eliminating the noise to convert becoming the displacement input data for providing the loads of automotive simulation testing. [ABSTRACT FROM AUTHOR]

Published
2023
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