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All Journal TEKNIK Jurnal Rekayasa Material, Manufaktur & Energi Jurnal Teknik Mesin Jurnal Teknik Industri Terintegrasi (JUTIN) Jurnal Darma Agung JPM: JURNAL PENGABDIAN MASYARAKAT BEES: Bulletin of Electrical and Electronics Engineering JUITECH: Jurnal Ilmiah Fakultas Teknik Universitas Quality Jurnal Prointegrita Medani : Jurnal Pengabdian Masyarakat Jurnal Sains dan Teknologi ISTP Jurnal Teknik Mesin UDA
Hodmiantua Sitanggang
Jurusan Teknik Mesin, Universitas Darma Agung
Aerospace Engineering Humanities Astronomy Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Public Health Social Sciences Transportation Other

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PEMANFAATAN MESIN PENCACAH SAMPAH ORGANIK PORTABEL UNTUK KEPERLUAN RUMAH TANGGA DI KECAMATAN SIMANINDO KABUPATEN SAMOSIR Hodmiantua Sitanggang; Enzo Wiranta Battra Siahaan
JUITECH: Jurnal Ilmiah Fakultas Teknik Universitas Quality Vol 5, No 2 (2021): Vol 5 No. 2 Tahun 2021
Publisher : Universitas Quality

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36764/ju.v5i2.632

Abstract

Simanindo District is a tourist destination of Lake Toba which is always crowded by foreign tourists thus increasing the amount of waste generated. Community behavior that is less concerned with environmental hygiene becomes another factor causing waste problems. Due to lack of care of the community then the amount of waste for households is also increasing due to the many uses of food scraps and beverages used by every community. From the observation result in Simanindo District with the population of 20190 people with the amount of waste 13 m3 / day assuming that each household produce household waste 0,25 kg / day, then 492,75 kg / day. Where 80% is organic waste, in 1 week there are 2759,4 kg or about 4.75 tons in 1 month. As a miniature of household organic waste management, with approximately 90 families there is 22.5 kg of waste / day. The impact of garbage accumulation is environmental pollution, unflattering scenery, air pollution, soil, and health problems. The solution of the problem is needed a practical tool and efficient to overcome household waste by realizing a portable organic waste enumerator machine Portable organic waste enumerator machine capable of chopping 6 kg / hour of household organic waste such as plant leaves are then used as compost raw material. The goal is to simplify and minimize the volume so it is practical enough to take to the next processing.
PENGARUH TURBOCHANGER TERHADAP DAYA MOTOR BAKAR PADA MESIN YANMAR MODEL 495-T 4 SILINDER 350 PS Hodmiantua Sitanggang,S.T, M.M; Enzo Wiranta Battra Siahaan,S.T,M.T
JUITECH: Jurnal Ilmiah Fakultas Teknik Universitas Quality Vol 5, No 1 (2021): VOL 5 NO 1
Publisher : Universitas Quality

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36764/ju.v5i1.533

Abstract

Along with the increasingly rapid development of science and technology, this will encourage every manufacturer or industry to develop its invention technology, for example, in the field of Automotive Technology which is experiencing a fairly rapid development. To get to the above, of course, an additional device is needed, one of which is by using a turbocharger. The turbocharger is a mechanism for supplying air with a density that exceeds the density of atmospheric air into the cylinder to be pressed in the compression stroke so that the motor power will increase. To get the effect of using a turbocharger, it can be done by conducting direct testing of the Yanmar Model 495-T 4 cylinder 350 PS engine with a variable rotation of 1300 rpm, 1700 rpm, 2100 rpm, 2500 rpm, 2900 rpm, and recording changes in the load on the dynamometer, internal temperature. space, radiator water temperature, lubricant pressure, air pressure coming out of the compressor, fuel consumption time per 50 cc. So that the results of the test show that the specific fuel consumption is 106 gr / hp-hr, while for a diesel motorbike without a turbocharger the specific material consumption is 126 gr / hp-hr, therefore the specific fuel consumption of a diesel motorbike using a turbocharger decreases by 15.87%. and the average effective pressure increases at the effective power (Ne) which is 152 hp, while for a diesel motorbike without a Turbocharger the effective power (Ne) produced is 110 hp so that the percentage increase in power obtained is 42%.
DISAIN DAN PABRIKASI PROTOTIPE PEMBANGKIT LISTRIK TENAGA PIKO HIDRO (PLTPH) KAPASITAS 250 WATT (DC) Enzo W.B Siahaan; Hodmiantua Sitanggang; Robby Robby; Sari Fitri Siagian
JUITECH: Jurnal Ilmiah Fakultas Teknik Universitas Quality Vol 6, No 1 (2022): Vol 6 No. 1 Tahun 2022
Publisher : Universitas Quality

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36764/ju.v6i1.764

Abstract

The pico-hydro power plant is a power plant with a water source as the driving force for the generator. The use of pico hydro has not been popularized in the community so that its utilization has not been maximized. The use of pico-hydro independently can encourage the acceleration of development of underdeveloped areas, because by utilizing pico-hydro it will create a community with independent power plants. This is an alternative way to produce renewable electricity sources because it does not use fuel. The most important components in the manufacture of this machine are the use of pumps, turbines and generators. The working principle of the Pico Hydro Power Plant (PLTPH) is very simple. That is by utilizing the water discharge per second that is in the flow of rivers, irrigation or waterfalls. The flow will be flowed to drive the turbine and will be continued to drive the generator. The expected capacity of this PLTPH prototype is 250 watts (dc). With a power capacity of 250 watts, it is expected to help the community in finding renewable power sources.
PENGARUH STRATEGI PEMBELAJARAN DAN MOTIVASI BELAJAR MAHASISWA TERHADAP HASIL BELAJAR MATA KULIAH PROSES PRODUKSI PADA PROGRAM STUDI TEKNIK MESIN FAKULTAS TEKNIK UNIVERSITAS DARMA AGUNG MEDAN Hodmiantua Sitanggang; Efendi Napitupulu; Sofyan Matondang
JURNAL PROINTEGRITA Vol 5 No 3 (2021): DESEMBER
Publisher : JURNAL PROINTEGRITA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (407.151 KB) | DOI: 10.46930/jurnalprointegrita.v5i3.789

Abstract

This research aims at analyzing the influence of learning strategy and motivation to learn students on the outcome of the production process in mechanical engineering study program of Darma Agung University of Medan. The research method used is a double linear regression analysis, with a sample number of 59 respondents. Research instruments are tested with validity tests and reliability tests. Test prerequisite analysis is done by normality test, multicolinearity test and heteroskedaticity test. The hypothesis test is performed with a partial test (t-test), simultaneous test (F-test) and a coefficient of determination test (R2 test). Analysis results obtained multiple linear regression equations Y = 16.168 + 1.366 (X1) + 0.454 (X2). Based on the hypothesis test acquired results: Learning strategy is positively and significantly influential about the outcome of the production process course; Motivation to learn positive and significant effect on learning outcomes of production process and learning strategy and learning motivation simultaneously positively and significantly affect the results of learning course production process. In order to improve student learning outcomes in the production process, the lecturers should be able to improve the learning strategy and learning motivation for the students taking the course.
THE INFLUENCE OF COMMITMENT AND WORKLOAD ON EMPLOYEE PERFORMANCE AT LAKE TOBA INTERNATIONAL MEDAN HOTEL Aristo Faye Pasaribu; Richard Elyas; Hodmiantua Sitanggang; Melias Metami Latersia; Marudut Sianturi
JURNAL PROINTEGRITA Vol 3 No 3 (2019): DESEMBER
Publisher : JURNAL PROINTEGRITA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (384.696 KB)

Abstract

Employee performance is very important not only for the employee itself but also for the organization as a whole, so that every organization gives serious attention to the achievement of employee performance, which is accompanied by all efforts to improve it, so that the work target of the organization can be achieved properly. This study aims to determine the influence of commitment and workload on employee performance at Danau Toba International Hotel Medan, both partially and simultaneously. The population of this study were employees who worked at the Lake Toba International Medan Hotel, which numbered 50 people. For total population are less than 100 people, thus total population taken as samples. Data was collected using a questionnaire and documentation. While the data analysis techniques used are correlation test, t test, F test and coefficient of determination. The results of study showed that the commitment variable had a positive and significant influence on the performance of employees of the Danau Toba International Hotel Medan. The higher commitment causes employee performance to increase. Workload variables have a positive and significant influenceonemployees performance. The higher the workload, the higher the performance of hotel employees. Commitment and workload variables simultaneously have a significant influence on employess performance. The determination coefficient of 85.80% in employee performance can be explained by commitment and workload simultaneously, while the remaining 14.20% is explained by other factors, such as competency variables and work discipline.
KAJIAN PENGARUH SUDUT PATAH SERPIHAN TERHADAP KEGAGALAN PAHAT PADA PEMOTONGAN BAJA AISI 4340 Enzo Wiranta Battra Siahaan; Hodmiantua Sitanggang; Hery Andi Sitompul; Fiqri Al Huda Fiqri Al Huda
JUITECH: Jurnal Ilmiah Fakultas Teknik Universitas Quality Vol 6, No 2 (2022): Vol 6 No. 2 Tahun 2022
Publisher : Universitas Quality

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36764/ju.v6i2.926

Abstract

Pada pemotongan logam belum adanya kajian sudut patah seerpihan terhadap kegagalan pahat pada baja AISI 4340  dengan metode faktorial mengunakan pahat karbda tin dari pengukuran kegagalan pahatnya. Tujuan dari penelitian ini untuk mengkaji sudut patah serpihan pada pahat karbida demi mengurangi biaya  produksi yang digunakan pada baja AISI4340 dengan pembubutan laju rendah dan kering dengan memvariasikan kecepatan potong (v), gerak makan (f), dan kedalaman (a). Manfaat dari penelitian ini aadalah untuk mengetahui sudut patah serpihan terbaik dari kegagalan pahat yang terjadi serta mengetahui terbentuknya morfologi geram dari setiap kondisi pemotongan diamati serta diukur terutama pada tebal geram guna untuk perhitungan rasio serpihan (o). Hasil dari penelitian menujukan bahwa morfolgi geram terbentuk tipe infinite helix pita kasar terputus dan dari penelitian ini, kondisi pemotongan (v) = 26m/min, (f)= 0,1mm/min dan (a) = 1mm terjadi keausan pahat terendah dengan (vb) = 1,22mm terletak pada sudut patah serpihan (o) = 42,082o Mekanisme morfolgi geram yang terjadi diakibakan pada rasio bidang geram terhadap sudut patah serpihan.
KAJIAN PERFORMA KERJA TURBIN UAP MITSUBISHI-LTD TIPE 10 HL-11 (STUDI KASUS : PT TOBA PULP LESTARI, TBK) Hot Mian Tua Sitanggang; Enzo Wiranta Battra Siahaan; Freend Eko Hasibuan
Jurnal Darma Agung Vol 30 No 3 (2022): DESEMBER
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Darma Agung (LPPM_UDA)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46930/ojsuda.v30i3.2315

Abstract

Turbin uap adalah mesin starter yang mengubah energi potensial uap menjadi energi kinetik, yang selanjutnya mengubah energi kinetik ini menjadi energi mekanik dalam bentuk putaran poros turbin. Uap yang dibutuhkan disuplai oleh dua unit motor boiler, boiler multi-bahan bakar, dan boiler pemulihan. Dalam pengoperasiannya, masing-masing boiler menghasilkan 140 dan 175 ton steam per jam. Dalam boiler, gas panas dihasilkan ketika bahan bakar terbakar dengan air panas udara, dan menghasilkan uap. Tekanan dan temperatur tertentu diarahkan untuk memutar turbin, menghasilkan tenaga mekanik dalam bentuk putaran. Tergantung pada jenis mesin yang digerakkan, turbin uap dapat digunakan di berbagai sektor industri, pembangkit listrik, dan transportasi. Dengan menganalisa perhitungan berdasarkan data lapangan turbin uap dari PT Toba Pulp Lestari, Tbk dengan kapasitas 53,7 MW, daya termal teoritis (isentropis) sebesar 43,9146 MW dan daya termal aktual sebesar 30,07484 MW, maka konsumsi uap spesifik sebesar 266 T/ jam diterima. Efisiensi isentropik turbin sebesar 68,48% dan efisiensi unit turbogenerator sebesar 96,94%.
STUDI KELAYAKAN DALAM PERENCANAAN TURBIN AIR PEMBANGKIT LISTRIK TENAGA MIKRO HIDRO (PLTMH) RAHUNING BERDAYA 70KW Enzo W.B Siahaan; Hodmiantua Sitanggang; Samuel Harianja
JURNAL DARMA AGUNG Vol 31 No 2 (2023): APRIL
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Darma Agung (LPPM_UDA)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46930/ojsuda.v31i2.3025

Abstract

Pembangkit Listrik Tenaga Mikro Hidro (PLTMH) adalah alternatif alat konversi energi yang perlu dikembangkan sebagai upaya pemenuhan listrik di pedesaan. Lokasi studi adalah di Desa Sungai Rahuning dan Desa Menanti. Jatuhan air (head) merupakan sumber energi potensial utama dalam mengoperasikan PLTMH dimana ketinggian jatuhan air memiliki dampak yang besar terhadap energi listrik yang dihasilkan. Metode analisis dilakukan secara kualitatif yang meliputi analisis data, keadaan topografi, analisis data debit air sungai, pengukuran tinggi air terjun, analisis aksesibilitas, kelayakan lokasi, perkiraan daya listrik yang terpasang serta tata letak PLTMH. PLTMH Desa Sungai Rahuning dan Desa Menanti memiliki ketinggian jatuhan air efektif sebesar 3 meter. Bahan material pipa pesat (Penstock) berbahankan besi plat rolled welded steel dengan minimum tebal pipa adalah 500 mm. Ukuran pipa pesat (penstock) memiliki panjang total sebesar 250 meter, diameter bagian penampang melintang luaran sebesar 500 mm, diameter dalaman sebesar 476 mm dan tebal sebesar 4,2 mm. Berdasarkan data di lapangan, turbin yang memungkinkan untuk diaplikasikan di desa tersebut adalah turbin crossflow D300-BO 500 mm berbahan material Mild Carbon Steel dengan efisiensi 65% sehingga secara total mampu menghasilkan daya terbangkit sebesar 70 kW.
PERANCANGAN TURBIN UAP PENGGERAK GENERATOR LISTRIK KAPASITAS 10 MW PADA PABRIK KELAPA SAWIT PT. PERKEBUNAN NUSANTARA IV UNIT PASIR MANDOGE Tri Amandani Siregar; Suhendri Ginting; Enzo WB Siahaan; Hodmiantua Sitanggang
Jurnal Teknologi Mesin UDA Vol 4 No 1 (2023): JUNI
Publisher : Lembaga Penenlitian dan Pengabdian kepada Masyarakat Universitas Darma Agung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (579.278 KB) | DOI: 10.46930/teknologimesin.v4i1.3322

Abstract

Energi sangat penting untuk meningkatkan kehidupan masyarakat. Energi listrik dibangkitkan oLeh Permukaan konversi daya yang mengubah uap menjadi energi mekanik pada poros turbin dan kemudian mengubah energi mekanik menjadi energi kinetik dalam nosel (turbin impuls). Atau nozel dan bilah ( pada turbin reaksi ). menggunakan gear reducer yang dihubungkan dengan mekanisme penggerak. Turbin uap banyak digunakan di berbagai bidang industri untuk menghasilkan tenaga listrik. Rencanakan perhitungan turbin uap untuk menggerakkan generator sehingga menghasilkan daya yang diinginkan. Perancangan dilakukan secara teoritis dan dipadukan dengan studi banding dengan kapasitas produksi 10 MW di PT. Unit Mandoge Pasir Perkebunan Nusantara IV. Desain ini menciptakan turbin gaya Curtis.
PERANCANGAN DAN ANALISA BIAYA POMPA HIDRAM PADA AIR TERJUN DESA DAMAK URAT KEC. SIPISPIS Ferry Kurniawan; Armandia Sinurat; Enzo W.B Siahaan; Hotmiantua Sitanggang
Jurnal Teknologi Mesin UDA Vol 4 No 1 (2023): JUNI
Publisher : Lembaga Penenlitian dan Pengabdian kepada Masyarakat Universitas Darma Agung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (548.183 KB) | DOI: 10.46930/teknologimesin.v4i1.3336

Abstract

Pompa hidram adalah sebuah sebuah alat yang di gunakan untuk memindahkan suatu ciran (fluida) dari suatu tempat ke tempat yang lain. Pompa hidram merupakan salah satu pompa air yang hemat energy dan ramah lingkungan. Pompa hidram merupakan teknologi tepat guna dalam bidang pemompaan dengan menggunakan tenaga momentum air (water hammer) untuk menaikan air yang di pompa, sehingga pompa hidram salah satu pompa air yang tidak menggunakan BBM dan listrik. Mekanisme pompa hidram yaitu air masuk dari terjunan melalui pipa penghantar atau pipa masuk ke katup buang di dorong ke katup penghantar sehingga katup penghantar terbuka ,dan air memasuki tabung udara.efektifitas kinerja dari pompa hidram di pengaruhi beberapa parameter, antara lain tinggi sumber air, diameter pipa, jenis pipa. Dalam perancangan pompa hidram yang penulis lakukan, menggunakan tinggi tabung 80 cm dengan diameter 3 inch dan 4 inch, dengan ketinggian sumber air ± 3 meter dan tinggi bak penampungan ± 8 meter dan pipa masuk berukuran 2 inch.
Co-Authors Albert Maychardo Sipayung Andi Sitompul, Hery Andri Muliadi Angge Christanti B Sinaga Aristo Faye Pasaribu Armandia Sinurat Chandro Dicky Laoli Debataraja, Semangat Marudut Tua Deby Syahputra Efendi Napitupulu Ferry Kurniawan Fiqri Al Huda Fiqri Al Huda Fransiskus Tiop Pandapotan Tarigan Freend Eko Hasibuan Hasballah, T Hendri Doyan Sinaga Heri Andi Sitompul JChevin Leo Nardo Hutagalung Kristian Tarigan Manalu, Citra Satria Maria A. Kartawidjaja Marudut Sianturi Melias Metami Latersia Melisa Mulyadi Minanda Syahputra Muhammad Fadillah Nababan, Bobby Sugandi Pandu Maduma Situmorang Pandu Pradana Rasta Purba Richard Elyas Rio Andri Noven Sinaga Rizky Ramadhan Robby Robby Rotama Arifin Sidabutar Roy Frengki Alianda Sinaga Samuel Harianja SARAGIH, ROBBI PRANATA Sari Fitri Siagian Sawin Sebayang Sholeha, Dewi Siaahaan, Enzo W.B Siahaan, Enzo W.B SIDABUTAR, ROTAMA Sinaga, Yesayanto Ngongira Sitanggang, Lundu Parlindungan Sitorus, Romah Suhendri Ginting T. Hasballah T. Hasballah TARIGAN, KRISTIAN Tri Amandani Siregar Widiyanto . Yosua Sirait