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All Journal Rekayasa Mesin Jurnal Keselamatan Transportasi Jalan (Indonesian Journal of Road Safety)
Setya Wijayanta
Politeknik Keselamatan Transportasi Jalan
Automotive Engineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Mechanical Engineering Transportation

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Batas Aman Muatan Sumbu Roda Dan Temperatur Tromol Ditinjau Dari Ambang Batas Efisiensi Rem Mobil Pick Up Futura Wijayanta, Setya; Sutarjo, Sutarjo; Shafa AF, Nadziba; Pambudi, Kurniawan
Jurnal Keselamatan Transportasi Jalan (Indonesian Journal of Road Safety) Vol. 6 No. 2 (2019): JURNAL KESELAMATAN TRANSPORTASI JALAN (INDONESIAN JOURNAL OF ROAD SAFETY)
Publisher : Pusat Penelitian dan Pengabdian Masyarakat (P3M)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (582.114 KB) | DOI: 10.46447/ktj.v6i2.36

Abstract

Kegagalan pengereman (rem blong) sering menjadi penyebab kecelakaan. Kelebihan muatan(Over loading) dan Temperatur tromol yang berlebihan (Over heating) sering diduga menjadipenyebab terjadinya kegagalan pengereman. Penelitian ini dibatasi pada pengaruh muatansumbu roda dan temperatur tromol terhadap efisiensi rem mobil pick up futura. Metode yangdigunakan adalah eksperimen dengan variasi kanvas original dan tiruan.Dari penelitian ini diperoleh hasil bahwa tinggi rendahnya muatan sumbu roda dan temperaturtromol berpengaruh signifikan terhadap efisiensi pengereman. Semakin tinggi muatan sumburoda dan temperatur tromol, maka semakin kecil efisiensi pengeremannya. Rumus empirishubungan antara muatan sumbu roda dengan efisiensi rem adalah y = -0,0003 x + 0,7891dengan R2 = 0,9737. Dari rumus empiris tersebut diperoleh nilai muatan kritis sumbu roda (x)963,67 Kg. Rumus empiris hubungan antara temperatur tromol dengan efisiensi rem adalah y =-0,0034 x + 0,8516 dengan R2 = 0,9041. Dari rumus empiris tersebut diperoleh nilai temperaturkritis luar tromol (x) 103,410 C. Ditinjau dari efisiensi rem yang dihasilkan dengan variasi muatansumbu roda dan temperatur tromol serta kecepatan kenaikan temperatur tromol, maka kanvasoriginal lebih baik dibandingkan kanvas tiruan (KW).
PENGARUH TEGANGAN PERMUKAAN PADA TEBAL FILM CAIRAN DAN KARAKTERISTIK GELOMBANG ANTARMUKA ALIRAN DUA FASE STRATIFIED HORIZONTAL Ari Prasetyo; Setya Wijayanta; Indarto Indarto; Deendarlianto Deendarlianto
Jurnal Rekayasa Mesin Vol. 13 No. 3 (2022)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v13i3.1212

Abstract

This experimental study aims to examine the effect of the surface tension on the characteristics of unidirectional air-liquid interface waves on a horizontal pipe. The pipe used is an acrylic pipe with a diameter of 26 mm. To vary the surface tension, the working fluid consisted of 100% water and water mixed with 2% and 5% butanol. with surface tension (σ) values ​​of 72, 58, and 42.5 mN/m, respectively. The wave characteristics studied in this research include the interface wave structure which is analyzed from visual observations and parameters by image processing. The superficial velocities of gas and liquid were varied in the range of 4-16 m/s and 0.02-0.1 m/s, respectively. Wave velocity and frequency were determined by using cross-correlation and power spectra density (PSD) from time-series data of liquid film thickness. Generally, velocity increases as the gas superficial velocity and surface tension decrease, the high gas superficial velocity the dominant frequency is high.
PENGARUH KADAR AIR DI DALAM BRAKE FLUID TERHADAP KARAKTERISTIK GELEMBUNG PADA PROSES PEMANASAN BRAKE FLUID Wijayanta, Setya; Humami, Faris; Wibowo, Helmi; Kristiawan, Komang Andre; Lazuardi, Wildan Surya
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1705

Abstract

The present study aimed to determine the effect of the percentage of water in brake fluid on the boiling point and the characteristics of bubble formation (the beginning of vapor lock) during the brake fluid heating process. DOT 3 Brake Fluid and water were used as the working fluid in the present study. To vary the water content in the brake fluid, water was mixed into the DOT 3 Brake Fluid. The water percentages in the mixture were 0, 1, 3, and 4%. The boiling point of brake fluid with four variations in the water content percentage was measured by using a digital thermometer. The characteristics of bubble formation in brake fluid were observed using a video camera with a frame rate of 240 fps. The video recording results were extracted into an image file with a jpeg extension and processed further using image processing with ImageJ software to measure the total cross-sectional area and bubble fraction. This is the novelty of the present study, where measurements of the total cross-sectional area and bubble fraction in boiling brake fluid with variations in water content have never been carried out by researchers before. Apart from that, the ImageJ measurement method has advantages compared to other software. ImageJ is free software that is easy to download from the internet, easy to use, accurate and the measurement results are displayed immediately. The research results show that an increase in the percentage of the water content in brake fluid affects reducing the boiling point of the brake fluid. At the same temperature, the greater the percentage of water content in the brake fluid, the total cross-sectional area and bubble fraction also increase. At the same percentage of water content, the total cross-sectional area and bubble fraction also increase as the temperature increases. Apart from that, in this research, an empirical equation was successfully developed to predict the brake fluid's boiling point based on its water content, and an empirical equation to predict the bubble fraction based on the water content and temperature of the brake fluid. This is a novel result of this research that has never been produced in previous research.
Co-Authors Ari Prasetyo Deendarlianto Helmi Wibowo, Helmi Humami, Faris Indarto Indarto Kristiawan, Komang Andre Lazuardi, Wildan Surya Pambudi, Kurniawan Shafa AF, Nadziba Sutarjo Sutarjo