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All Journal LONTAR Jurnal Teknik Mesin Undana (LJTMU )
Jack C.A. Pah
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Mechanical Engineering

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Karakteristik Pembakaran Difusi Campuran Solar Murni dengan Minyak Kelapa Jack C.A. Pah; Defmit B.N. Riwu; Adi Y. Tobe; Suprianto Siagian
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 7 No 01 (2020): April 2020
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.1234/ljtmu.v7i01.3379

Abstract

This research was conducted to determine the effect of adding coconut oil to pure diesel oil on the characteristics of diesel oil steam diffusion combustion. The characteristics observed are flame height and fire temperature. The combustion process is carried out on a circular tube burner. The steam mass flow of fuel in this study is 0.0895 grams / second. From the results of the study the biggest results were obtained in the mixture of 90% diesel oil with 10% coconut oil, fire height of 94.51 mm and a temperature of 967˚C and the lowest yield was found in a mixture of 70% diesel oil and 30% coconut oil, namely temperature amounting to 796˚C and fire height of 68.85 mm. From this, it can be concluded that the greater the percentage of diesel oil added to the combustion process, the higher and the flame temperature will increase. This is due to the characteristics of different fuels, where diesel oil has a lower viscosity than coconut oil and has a heating value greater than coconut oil.
Rancang Bangun Mesin Pemarut Batang Putak Vinsen Yuminto Bifel; Defmit B.N. Riwu; Jack C.A. Pah
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 8 No 01 (2021): April 2021
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

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Abstract

Putak is the name of a local feed on the island of Timor, East Nusa Tenggara which is obtained from the trunk of the gewang tree (Coypha gebanga). Most of the putak processing by the people of Timor Island is very low and also limited so that putak productivity is very low because people still do it traditionally and only use it as food. Therefore, this study aims to design a putak grater for animal feed. The VDI 2221 method is a design method that uses a systematic approach to design for engineering systems and engineering products. The effective capacity of the tool is obtained by grating / repeating 3 times, then the average effective capacity of the tool is calculated. In testing the putak sticks used to produce a grated mass volume of 3,5 kg, and a tool capacity of 70 kg/hour. The results showed that the effective capacity of the putak grating machine was 70 kg/hour.
Waktu Gesek Terhadap Kekuatan Tarik Sambungan AA6061-Baja Karbon Pada Pengelasan Gesek Continuous Drive Jack C.A. Pah; Defmit B.N. Riwu; Dominggus Adoe; Adi Y. Tobe
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 8 No 02 (2021): Oktober 2021
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.1234/ljtmu.v8i02.5940

Abstract

The objective of this research was to get the effect of friction time on the tensile strength of the joining of aluminum alloy AA6061 and carbon steel, with continuous drive friction welding process. Variations of friction time of this research were 5 seconds, 7 seconds, 9 seconds, and 11 seconds. Other friction welding variables were friction pressure 24 MPa, forging pressure 79 MPa, forging time 60 seconds, and friction rotation speed 1600 rpm. The independent variable was the ultimate tensile strength of the welded joint. The results showed that the relationship between friction time and ultimate tensile strength is not linear, with the increase in friction time. The increasing of friction time, caused the ultimate tensile strength increase to a maximum value and then the ultimate tensile strength of the joint will decrease sharply. The greatest ultimate tensile strength is obtained at a friction time 9 seconds, with ultimate tensile strength 111.89 MPa
Co-Authors Defmit B.N. Riwu Dominggus Godlief Heryson Adoe Suprianto Siagian Tobe, Adi Yermia Vinsen Yuminto Bifel