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All Journal GEMA TEKNOLOGI Jurnal Rekayasa Mesin Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi Journal of Vocational Studies on Applied Research
Juli Mrihardjono
Program Magister Teknik Mesin, Program Pascasarjana UNDIP Semarang
Aerospace Engineering Automotive Engineering Computer Science & IT Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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PENGUJIAN MODEL DRIVING CYCLE KENDARAAN HONDA CITY BERBAHAN BAKAR PREMIUM Mrihardjono, Juli; Sinaga, Nazaruddin
Gema Teknologi Vol 16, No 3 (2011): April 2011 - October 2011
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (244.884 KB) | DOI: 10.14710/gt.v16i3.4712

Abstract

Juli Mriharjono, Nazaruddin Sinaga, in this paper explain that a driving cycle model can be used to estimate fuel consumption and exhaust gas emission. Driving cycle varies significantly for traffic conditions. Testing of driving cycle model, for a specific vehicle, is needed so that able to be used as fuel consumption and emissions estimation on real traffics. This paper studied driving cycle model in a laboratory. The EPA standard was reffered as the testing procedure. The vehicle used was Honda City 1.5L fueling with gasoline (premium - in Indonesia). The result shows that driving cycle model profile meets with the EPA standard. Changing gears, which affect to vehicle speed, was not affect significantly to fuel consumption which indicated by constant AFR during the cycle. The factors that cause the difference speed of vehicle were gas pedal operated manually, timing of changing gear, and gear operation time duration. Keywords: Driving cycle, exhaust gas emissions, fuel consumption
Konsep Desain Mesin Panen Garam Kendali Manusia Berkapasitas 25 kg per Batch Ariwibowo, Didik; Sutrisno, Sutrisno; Mrihardjono, Juli; Wijayanto, Bagus; Prasetyo, Budi
Jurnal Rekayasa Mesin Vol 17, No 3 (2022): Volume 17, Nomor 3, Desember 2022
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v17i3.3489

Abstract

Di Indonesia, proses panen garam dari meja garam dilakukan oleh manusia dengan menggunakan sekop. Proses tersebut tidak produktif karena keterbatasan tenaga manusia yang melakukan di bawah lingkungan panas terik matahari. Untuk itu, konsep desain mesin panen garam dikemukakan dan dievaluasi. Metode dalam mengonsep desain mesin panen garam merujuk pada metode desain rekayasa dari Pahl dan Beitz, yang dimulai dari dekomposisi fungsi hingga keputusan memilih konsep desain terbaik. Konsep desain mengarah bahwa mesin panen garam tersebut digunakan untuk mengambil garam dari meja garam dan memindahkannya kedalam karung. Semua fungsi dilakukan dalam satu mesin dan digerakkan oleh suatu penggerak mula. Sedangkan pengendalian terhadap jalannya mesin dilakukan oleh manusia atau operator. Beberapa kriteria desain mesin diantaranya adalah kapasitas 25 kg garam per batch, dan berat mesin yang didukung oleh meja garam tidak lebih dari 30 kg untuk menjamin geoisolator meja garam tidak rusak. Tujuan dari evaluasi ini untuk mendapatkan konsep desain mesin terbaik yang produktif dan memenuhi kriteria. Tahap evaluasi desain meliputi dekomposisi fungsi, pengembangan konsep dengan bantuan matriks morfologi dan evaluasi kelayakan, yang menentukan apakah desain tersebut lolos atau tidak dengan menggunakan matriks keputusan. Secara teknis, beberapa konsep desain diajukan dan kemudian dikembangkan dengan dasar kriteria atau batasan-batasan desain. Hasilnya adalah suatu konsep desain mesin panen garam yang efisien, produktif, dan ramah lingkungan, yang direkomendasikan untuk selanjutnya dibuat prototipe virtual dan diuji.
ANALISIS PERFORMANCE COOLING TOWER TIPE INDUCED DRAFT COUNTER FLOW PLTP KAMOJANG UNIT 5 Abdurohman, Hasan; Mrihardjono, Juli; Darmanto, Seno
Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi Vol 8, No 2 (2022): Oktober
Publisher : universitas teuku umar

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (26.898 KB) | DOI: 10.35308/jmkn.v8i2.6526

Abstract

Cooling tower is a heat exchanger used to cool water from the condenser. The process is carried out by contacting water with air directly and discharged into the atmosphere using air fluid that is flowed naturally or flowed by a fan. Cooling tower type used in PLTP Kamojang Unit 5 is Induced draft Counter Flow. This equipment more important in increasing turbine efficiency, therefore special treatment is needed by knowing and observing the performance of the Cooling tower so that it can be analyzed in actual conditions and make decision steps in carrying out further repairs and maintenance, this is the basis of research that will be carried out by looking for value and the Cooling tower performance trendline. The calculation method uses the standard ASME PTC 23-2003 and CTI ATC-105 where the results are the calculation baseline and the historical trendline of Cooling tower performance based on the parameters of the 3-cell Cooling tower operating conditions. The parameters tested are by taking 5 valid data on PLTP KMJ Unit 5, then the Tower Capability performance values are obtained as follows, namely in the initial commissioning conditions the performance value is 92,1%, Q1 2021 is 78,8%, Q3 2021 is 74, 3%, Q4 2021 is 84,7%, and Q1 2022 is 83,8%. There was a decrease in Q3 2021. Then there was an increase in the trend in Q4 2021 due to previous overhaul activities on the Cooling tower. Keywords: Cooling tower, trendline, overhaul, tower capability
UJI PERFORMA MESIN MENGGUNAKAN BAHAN BAKAR PERTAMAX DAN PERTAMAX TURBO PADA MESIN 4 LANGKAH CAHYA NEGARA, ABDI MUHAMMAD; Atmanto, Ireng Sigit; Mrihardjono, Juli
Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi Vol 9, No 1 (2023): April
Publisher : universitas teuku umar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35308/jmkn.v9i1.7096

Abstract

Performance and vehicle exhaust emissions are determined by many factors that come from various components and take place in a related manner. This test uses 4 types of motorcycles with different cylinder volumes. The test was conducted using a dynamometer test equipment. How to test on a dynamometer using fuel pertamax and Pertamax turbo. Data were taken on transmission gears 1, 2, 3 and 4 at speeds of 20 km, 40 km and 60 km. For emission testing follows the procedure of taking power and torque data and performed simultaneously.The content of emissions in the exhaust gas is CO, CO2, HC and O2 based on the results of the use of exhaust emissions test equipment.The relationship between vehicle speed and gear position to power, torque and exhaust emissions on 2 different fuels is the higher the transmission gear position and speed, the result is high, namely on pertamax fuel (power, torque, CO gas emissions) and pertamax turbo (Power, Torque, CO gas emissions, CO2 gas), the lower the transmission gear position and speed, the result is high, namely on pertamax fuel (CO2) and the lower the transmission gear position and speed, the result is high, namely HC on pertamax fuel and pertamax turbo.The test results of statistical tests t-test 2 samples obtained the results of the fuel test pertamax = Pertamax turbo fuel test on 4 vehicles with different cylinder volumes. Exceptions exist in 160 cylinder volume vehicles in the HC test and 125 cylinder volume vehicles in the CO2 test.
Failure Analysis at Stem Valve Fire Hydrant in LNG Plant Mrihardjono, Juli; Pohan, Herman Abidin; Darmanto, Seno
Journal of Vocational Studies on Applied Research Volume 1, Issue 2, Year 2019 (October 2019)
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4020.643 KB) | DOI: 10.14710/jvsar.v1i2.4527

Abstract

Hydrant is one of fire extinguisher fix system that use pressure water and flowed through the pipes and fire hose. There are more 250 Hydrant in this LNG Plant and based on finding at the field, many stem valve of outlet hydrant in fracture condition, therefore the author wants to analyze about the problem from this material, this reserch aims to find out root cause dan conduct failure analysis, method of reserch that conducted is visual check  to predict possible cause from failure of stem valve fire hydrant and then conducted fractographic analysis to find out what type of fracture that happen to this material and Tensile Strenght Test to Find out the the actual strenght of the material
Failure Analysis Of Water Pump Shaft Ariwibowo, Didik; Putra, Sulthonul; Darmanto, Seno; Mrihardjono, Juli; Mangestiyono, Wiji
Journal of Vocational Studies on Applied Research Volume 1, Issue 2, Year 2019 (October 2019)
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (817.879 KB) | DOI: 10.14710/jvsar.v1i2.6301

Abstract

A water pump shaft for utility water raw material was failed. The shaft was broken into two parts. While in dismantling, the sand was found in chamber between bearing and shaft. There was also a bolt in the impeller. According to reports, the pump has been repaired and since there was no replacement shaft but the shaft was reused in reverse position. There was no inspection of the shaft when it was disconnected by operational reasons. The failure analysis of the broken-shaft was performed to investigate the cause of the failure. Two inspection and analysis were perfomed those are visual inspection and material identification and analysis. When material analysis of the shaft was carried out there was difference between examination and data specification of the shaft.The material identification indicate that the material was AISI SS 304 whereas specification data states SS 316. Both materials have similar tensile stress, so the difference was not the contributor of the failure. The present of foreign material was consider as the cause of the failure. The foreign material caused to stucked on rotation of shaft and increasing in tensile of the shaft over its ultimate strength.
Co-Authors Abdurohman, Hasan Budi Prasetyo CAHYA NEGARA, ABDI MUHAMMAD Didik Ariwibowo Ireng Sigit Atmanto Nazaruddin Sinaga Pohan, Herman Abidin Putra, Sulthonul Seno Darmanto Sutrisno, Sutrisno Wijayanto, Bagus Wiji Mangestiyono