Article Per Year (5 Year)
p-Index From 2020 - 2025
1.642
P-Index
This Author published in this journals
All Journal LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Turbo : Jurnal Program Studi Teknik Mesin
Mangesa, Daud P.
Unknown Affiliation
Mechanical Engineering

Published : 9 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 9 Documents
Search

 1 
Analisa Potensi Gelombang Laut sebagai Sumber Energi Terbarukan Menggunakan Perangkat Oscillating Water Column (OWC) Di Wilayah Perairan Laut Timor Jasron, Jahirwan Ut; Mangesa, Daud P.; Boimau, Kristomus; Tarigan, Ben V.; Maliwemu, Erich U.K.; Salombe, Mexin
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 9 No 01 (2022): April 2022
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v9i01.7269

Abstract

An in-depth study is needed on the use of alternative energy to overcome human energy needs. This study aims to analyze the potential of ocean wave energy that can be converted by the "Oscillating Water Column" device on the Kolbano coast as a renewable energy source. Kolbano Beach is located in Kolbano Village, Kolbano District, and TTS Regency (South Central Timor) East Nusa Tenggara Province with an area of​approximately 17 sq km stretch of Kolbano beach area facing the Indian Ocean so that the consistency of the wave height produced is quite large. The wave height is large enough to be used as an alternative power plant. This research was conducted in Kolbano coastal waters, data on wave height and wind speed from BMKG (Metrology, Climatology, and Geophysics Agency) Kupang City in 2019 – 2021m with wave heights ranging from 0.31 to 2.3 m and wind speeds ranging from 1 .05 to 8.48 Watts.
Analisis Penurunan Faktor Geometri Pada Pengujian Performa Rotor Turbin Angin Sumbu Horizontal Tipe Propeler Tiga Blade Koehuan, Verdy A.; Dm, Muh. Guntur; Mangesa, Daud P.
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 10 No 02 (2023): Oktober 2023
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v10i02.9304

Abstract

Penurunan faktor skala pengujian ataupun skala geometri pada kondisi laboratorium ini tentu sangat berpengaruh pada performa dari rotor secara signifikan sebagai akibat dari penurunan skala geometri maupun kondisi terowongan angin yang digunakan dalam pengujian. Oleh karena itu dalam penelitian ini dilakukan pengujian skala laboratorium terhadap performa turbin angin rotor tunggal melalui penurunan faktor skala geometri rotor turbin. Model blade rotor turbin angin menggunakan seri airfoil S826 yang dikeluarkan oleh NREL (National Renewable Energy Laboratory), diameter rotor pada skala lapangan (full scale) adalah 0,944 m. Penurunan faktor geometeri rotor turbin dari 30%, 26,5 % dan 25 % menunjukkan presentasi koefisien daya turbin terhadap turbin full scale (D=0,944m) mengalami penurunan. Presentasi penurunan koefisien daya turbin 1 dengan Cp/Cp,full = 8,94 %, dan masing-masing turbin 2 dan turbin 3 adalah 1,74% dan 0,69 %. Sedangkan presentasi penurunan TSR turbin 1 dengan TSR/TSR,full = 72,63%, dan masing-masing turbin 2 dan turbin 3 adalah 32,49 % dan 21,5 %.
Rancang Bangun Mesin Pemipil Jagung Dengan Metode VDI 2222 bunganaen, wenseslaus; Toai, Yopi; Mangesa, Daud P.
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 9 No 02 (2022): Oktober 2022
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v9i02.9322

Abstract

Corn farmers in general still use the traditional method of using their hands to separate the corn from the cobs, this requires more energy and time to separate the corn from the cobs. A shelling machine is needed as a means to assist farmers' needs in shelling corn to facilitate the existing shelling and save labor. The purpose of designing this corn sheller machine is to produce a design and produce a corn sheller machine for the needs of farmers in East Nusa Tenggara. The method of data collection and processing is carried out by applying the VDI (Verein Deutsche Inggenieur) 2222 method through 4 stages, namely analysis, design concept, design and embodiment. Based on the results of the planning of this corn sheller machine, the result of this corn sheller machine is that the shelled corn is clean from the corn cobs because it uses a soft material for shelling, namely rubber plucker so that it does not destroy the corn cobs.
Simulasi CFD (Compulational Fluid Dynamics) Turbin Angin Sumbu Horizontal Tipe Propeler Tiga Blade Rotor Ganda Melalui Variasi Geometri Koehuan, Verdy A.; Hale, Roybertho Agustinus; Mangesa, Daud P.
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 10 No 02 (2023): Oktober 2023
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v10i02.11503

Abstract

Tujuan penelitian ini adalah untuk mengetahui performa turbin angin sumbu horisontal atau horizontal axis wind turbine (HAWT) tipe propeler tiga blade rotor ganda kontra rotasi (double rotor counter-rotation) terhadap variasi geometri rotor CRWT menggunakan metode computational fluid dynamics (CFD). Hasil simulasi CFD rotor turbin CRWT dengan penurunan skala geometri menunjukkan turbin cenderung beroperasi pada TSR rendah. Rotor depan turbin CRWT cenderung beroperasi dengan koefisien daya dan TSR yang lebih tinggi dari rotor belakang. Vektor kecepatan aliran pada bidang vertikal arah aksial CRWT juga dikonfirmasi oleh hasil analisis kontur kecepatan aliran dan kontur turbulent kinetic energy terhadap penurunan performa CRWT karena adanya penurunan faktor skala geometri rotor turbin. Vektor kecepatan pada tip blade antara rotor depan dan rotor belakang pada turbin CRWT dengan penurunan skala geometeri (FC = 0,25 dan 0,26 serta 0,3) yang beroperasi di TSR rendah yang arahnya cenderung menguat menuju ke tip blade dengan besaran vektor yang makin kuat di sisi hisap (suction surface) blade rotor belakang. Besaran vektor ini semakin kuat ini dapat membentuk vorteks yang menurunkan performa CRWT.
Analisis Pengaruh Variasi Tekanan Pada Briket Cangkang Kemiri Terhadap Temperatur, Laju Pembakaran Dan Kadar Abu Tonda, Naptalia; Jasron, Jahirwan Ut; Pell, Yeremias M.; Mangesa, Daud P.
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 11 No 01 (2024): April 2024
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v11i01.14971

Abstract

In the process of making briquettes, there are still obstacles, namely, the printing process still uses traditional methods, and the existing briquette printing equipment is also not equipped with a hydraulic system and pressure gauge, so it requires more printing time. It cannot know how much pressure is applied during printing. A briquette printing machine equipped with a hydraulic system and pressure gauge is needed to simplify the briquette printing process and save energy. The aim of designing this briquette printing machine is to produce a press machine design with a hydraulic system equipped with a pressure gauge. The design method used in this research is the Shigley-Mitchell method. This briquette press has a length of 350 mm, a width of 450 mm, and a height of 840 mm. The mold cylinder has 16 mold cylinders. In one printing cylinder, it can produce briquettes weighing 52 grams with a height of 80 mm, so in one printing, this tool, with a printing time of 6.5 minutes, can produce 0.832 kg briquettes. The capacity of this briquette press per hour is 148 briquettes/hour.
Uji Kinerja Mesin Perajang Singkong Menggunakan Mekanisme Pengumpan Otomatis Mantutu, Anggi R.; Mangesa, Daud P.; Tobe, Adi Yermia
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 11 No 02 (2024): Oktober 2024
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v11i02.14076

Abstract

This research focuses on testing the performance of the cassava chopper machine using an automatic feeder mechanism that is applied to the cassava chopper machine to speed up the production process and improve product quality. The purpose of this research wants knowing the working principle of the cassava chopper using an automatic feeder, knowing the performance capacity of the cassava chopper using an automatic feeder, knowing the percentage of damage to the chopper and the value of the thickness of the chopper at one time of the chopping process. The research method used is a type of engine performance testing. Namely observing, measuring and calculating the performance testing of the cassava chopper machine. In collecting data for the calculation of chopping capacity and thickness of the sliced product, it was carried out by preparing 9 kg of cassava and the test was carried out 9 times using variations in the angle of the blade and 1 minute for each test. From the test results, it was found that the chopping capacity at blade setting A was 55.68 kg/hour, knife B was 57.48 kg/hour, and knife C was 59.34 kg/hour, with a slice thickness of 1-3mm.
Rancang Bangun Alat Pemeras Madu Hybrid Sistem Sentrifugal Bunganaen, Wenseslaus; Mangesa, Daud P.; Bukifan, Avelino
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 11 No 02 (2024): Oktober 2024
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v11i02.19855

Abstract

Madu merupakan salah satu produk hasil hutan yang sudah lama di kenal oleh masyarakat dan banyak manfaat diantaranya sebagai suplemen kesehatan, obat luka, kecantikan, dan sebagai bahan industri makanan dan minuman. Namun para petani mendapat kendala dalam proses pemeras madu, karena masih menggunakan cara pemeras tradisional. Sehingga hal tersebut berpengaruh pada lama waktu pemerasan dan kenyamanan para petani madu. Melihat hal tersebut penulis terdorong untuk membuat alat yang berguna dalam proses pemerasan madu dan proses produksi yang cepat. Selanjutnya diperlukan rancangan mesin pemeras madu yang merupakan solusi untuk mempercepat proses pekerjaan petani madu dalam menghasilkan air madu yang berkualitas. Pada proses perancangan ini menggunakan sistem hybrid yang pemerasan dilakukan dengan dengan menggunakan motor listrik dan engkol manual. Kapasitas sarang lebah yang diperas mencapai 2 kg dalam waktu 3 menit dengan menggunakan engkol manual. Sedangkan menggunakan motor listrik dengan kapasitas 2 kg dengan waktu 1 menit. Produksi madu dengan mesin pemeras madu memberikan keuntungan yang signifikan pada proses waktu produksi dan kualitas air madu dibandingkan dengan produksi air madu mengunakan cara tradisional. Penggunaan mesin pemeras madu merupakan solusi atas permasalah yang ada.
OPTIMASI MESIN PERAJANG SINGKONG DENGAN MEKANISME PENDORONG BAHAN BAKU OTOMATIS Runesi, Altruis Krisman; Mangesa, Daud P.; Selan, Rima Nindia
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 12 No 01 (2025): April 2025
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v12i01.12022

Abstract

ABSTRACT Cassava is one of the agricultural commodities spread across most parts of Indonesia, especially in the province of NTT. The abundant potential makes cassava a staple food for the people of East Nusa Tenggara. UD. ML is a company that produces and markets cassava chips to meet the needs of the people of Kupang and its surroundings. During the cassava chips production process, the tools used are still using manual choppers with human power, so that it can cause defective products to be produced, such as errors in cutting that are not too thin or thick and the pieces are destroyed because they are too thin and worker fatigue when chopping cassava . The research method used in this study is the experimental method, observation and literature study. From the test results, it was found that the chopping capacity at blade setting A was 660 grams, knife B was 740 grams, and knife C was 800 grams, with a thickness of 1-3mm.
Akibat peningkatan tekanan gesek terhadap kekuatan tarik sambungan pada proses pengelasan gesek continuous drive AA6061- baja karbon sedang Pah, Jack Carol Adolf; Riwu, Defmit B. N.; Maliwemu, Erich U.K.; Tobe, Adi Yermia; Bunganaen, Wenseslaus; Mangesa, Daud P.
TURBO [Tulisan Riset Berbasis Online] Vol 12, No 1 (2023): Jurnal TURBO
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v12i1.2296

Abstract

The objective of this research was to get the effect of friction pressure on the tensile strength of the joining of aluminum alloy AA6061 and carbon steel, with continuous drive friction welding process. Variations of friction pressure of this research were 24 MPa, 32 MPa, and 40 MPa. In this study, a friction time 9 seconds was used. Other friction welding variables were, 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 increase in the tensile strength of the joint was not linear with the increase of frictional pressure. The rate of the increase in the tensile strength of the connection, will decrease after the frictional pressure passes through 32 MPa. When the rate of increase in the tensile strength of the joint begins to decrease, the joint will become more brittle. The maximum tensile strength of the joint in this study was 167.421 MPa at a frictional pressure of 40 MPa.Rasakan keseruan bermain di om88 dengan peluang menang yang lebih besar. Nikmati pengalaman bermain yang seru, aman, dan penuh tantangan. Segera coba dan raih kemenangan besarmu!
Co-Authors Adi Yermia Tobe Bukifan, Avelino Defmit B.N. Riwu Dm, Muh. Guntur Erich Maliwemu, Erich Hale, Roybertho Agustinus Jahirwan Ut Jasron Kristomus Boimau Mantutu, Anggi R. Pah, Jack Carol Adolf Pell, Yeremias M. Rima Nindia Selan Runesi, Altruis Krisman Salombe, Mexin Tarigan, Ben V. Toai, Yopi Tobe, Adi Yermia Tonda, Naptalia Verdy A. Koehuan Wenseslaus Bunganaen