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Leo Soemardji
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Mechanical Engineering

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Journal : Jurnal MEKANIKAL

 1 
KONFIGURASI SISTEM KEMUDI DAN PENGGERAK KENDARAAN TRAKTOR PERTANIAN DALAM BERBAGAI ARAH GERAK Soemardji, Leo; Mustofa, Mustofa
Jurnal MEKANIKAL Vol 3, No 2 (2012)
Publisher : Jurnal MEKANIKAL

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Abstract

This study aims to describe and show the configuration of the integration between the steering system on both front wheel drive system and the controller at the rear wheels on the vehicle type agricultural tractors. The system comprises four tractor steering wheel. Model analysis of the movement of the system displayed good mathematical equation model moves toward forward, rewind and play with various configurations. Further analysis was performed in Mathlab program that makes it easy to see variations of the steering angle, wheel speed drive and motion of different models using the specific parameters that correspond to the size of one type of agricultural tractors. The ability to move the steering wheel in different directions and the steering wheel angle greatly affect the ability of the tractor to resist external forces that occur when the through road, especially elevation and slippery. This analytical model can be developed for other types of agricultural vehicles, such as lawn mowers and off-road vehicles.
LAJU KOROSI STAINLESS STEEL DALAM MEDIA AIR LAUT Zuchry, Muhammad; Soemardji, Leo
Jurnal MEKANIKAL Vol 9, No 2 (2018): Jurnal Mekanikal Juli 2018
Publisher : Jurnal MEKANIKAL

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Logam ferro banyak diaplikasikan dalam bidang keteknikan terutama pada lingkungan korosif. Sifat logam ferro yang  korosif menyebabkan perlunya alternatif material dalam lingkungan korosif terutama pada lingkungan air laut. Salah satu material yang digunakan pada lingkungan air laut adalah stainles steel.Korosi  adalah penurunan mutu logam yang diakibatkan oleh lingkungan atau zat kimia dan berpengaruh pada kondis suatu material yang dapat disebabkan oleh beberapa faktor  seperti salinitas, pH, temperatur dan kelarutan oksigen dalam media korosi, dllPerhitungan laju korosi stainles steel  dalam media air laut dilakukan dengan perendaman (Immersion) dengan metode kehilangan berat (Weight Losst) menggunakan media korosi air laut kondisi pasang dan kondisi surutDari hasil penelitian diperoleh bahwa pengurangan berat pada kondisi surut lebih besar dibandingkan kondisi pasang yang berpengaruh pada laju korosi.Kata kunci : Korosi, steinles steel  , Metode kehilangan berat (Weight Lost), air laut, pasang, surut
PENGARUH TEMPERATUR TUANG DAN KANDUNGAN SILICON TERHADAP NILAI KEKERASAN PADUAN Al-Si Bahtiar, Bahtiar; Soemardji, Leo
Jurnal MEKANIKAL Vol 3, No 2 (2012)
Publisher : Jurnal MEKANIKAL

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Abstract

Research on the effect of temperature and silicon content cast on the value of Al-Si alloy violence done by re-casting of the alloy Al-0.24% Si. The temperature variation with temperature castings made ​​71, 760 and 810oC. The addition of silicon content is done by adding alloys Al-0.24% Si alloy ADC 12. From the results of the study concluded that the temperature did not cast a significant influence on increasing the value of violence. Effect of the addition of silicon content increases the value of the product of violence cast Al-0, 24Si at 33.67 to 56.06 BHN on silicon content of 2.66% for a temperature of 710oC cast. Hardness value at a temperature of 760OC castings for silicon content of 0.24% by 34.59 BHN also experienced an increase in the silicon content of 2.66% to 50.81 BHN hardness value. BHN hardness value of 36.55 at a temperature of 810 OC cast for the silicon content of 0.24% increased to 54.24 BHN on silicon content of 2.66%.
Co-Authors Bahtiar Bahtiar Muhammad Zuchry M Mustofa Mustofa