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LONTAR Jurnal Teknik Mesin Undana (LJTMU )
Published by Universitas Nusa Cendana
ISSN : 23563222     EISSN : 24073555     DOI : -
Core Subject : Engineering,
Mechanical Engineering
Lontar Jurnal Teknik Mesin Undana merupakan jurnal ilmiah rekayasa teknologi, khususnya bidang Teknik Mesin, meliputi: Energy Convertion, Manufacture Process, Engineering Design, Material Engineering.
Arjuna Subject : -
Articles 216 Documents
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Analisis Eksperimental Variasi Kecepatan Aliran Udara Panas Pada Proses Pengeringan Ikan Menggunakan Rumah Pengering Tipe UV Solar Dryer selan, lederson; Koehuan, Verdy A.; Sanusi, Arifin
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.v10i02.9014

Abstract

Penggunaan energi matahari dinilai sangat menguntungkan karena merupakan sumber energi terbarukan, salah satunya di bidang industri. Teknik pengawetan produk baru adalah dengan menggunakan teknik pengeringan. Pengembangan dan pemanfaatan energi surya perlu lebih diperluas dengan beberapa teknologi diantaranya Solar Air Heater. Pemanas udara surya adalah sejenis pemanas udara surya. Metode penelitian yang dilakukan adalah metode eksperimen pengering solar UV domestik untuk penjemuran ikan tembang dengan tambahan penyerapan panas radiasi matahari menggunakan solar air heater system.Dalam konfigurasi ini, udara diambil dari selubung bangunan atau dari lingkungan luar dan melewati pengumpul dimana udara dipanaskan secara konduksi dan konveksi di dalam penyerap. Analisis penelitian ini mengenai kecepatan udara panas yang masuk ke dry house dari solar air heater panel pada variasi kecepatan udara (3,3 m/s, 3,5 m/s, 3,6 m/s) dengan udara keluar dari drying house. (kipas buang) 1,5 m/s (konstan).
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 %.
Analisis Perubahan Tekanan Udara Perangkat Oscillating Water Column dengan Metode phi-Buchingham Kasi, Paulinus Sargius; Jasron, Jahirwan Ut; Gurnawati, Gurnawati
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 10 No 01 (2023): April 2023
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v10i01.11051

Abstract

ABSTRACT The increase in human population along with the times and technology must be increasingly difficult to separate from energy needs, one of which is the need for electrical energy. One source of energy that has not been widely utilized is ocean wave energy. Ocean wave power plants basically have a working principle, namely converting ocean wave energy (mechanical energy) into electrical energy. One of the wave energy conversion system technologies is the Oscillating water column (OWC) technology. Technology Oscillating Water Coloumn this, using the air pressure from the watertight chamber to movewells turbine This turbine will then be used to generate electricity. Forms of studies that can be carried out to study the phenomenon of changes in device air pressure Oscillating Water Coloumn is mathematical modeling. One of the mathematical modeling can be done by phi-Buchingham. Using Buckingham's Pi theorem dimensional analysis can make it easier to analyze and make experimental steps faster and more focused. Keywords: Ocean waves, Oscillating Water Coloumn (OWC), Barometric pressure, phi-Buchingham
ANALISIS GARIS ALIRAN (STREAMLINE) PADA TURBIN ANGIN SUMBU HORIZONTAL TIPE PROPELER TIGA BLADE ROTOR GANDA DENGAN METODE CFD (COMPULATIONAL FLUID DYNAMICS) Hangge, Fernanda Yusuf; Koehuan, Verdy A.; Bunganaen, Wenseslaus
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 10 No 01 (2023): April 2023
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v10i01.11502

Abstract

Tujuan penelitian ini adalah untuk mengetahui pola garis aliran fluida melewati rotor turbin angin sumbu horisontal atau horizontal axis wind turbine (HAWT) tipe propeler tiga blade rotor ganda kontra rotasi (double rotor counter-rotation) melalui 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. Garis aliran (streamline) pada bidang horizontal arah aksial CRWT mengkonfirmasi pengaruhnya terutama aliran di sekitar permukaan blade terhadap performa CRWT. Garis aliran pada permukaan blade rotor depan dan rotor belakang pada turbin CRWT terhadap penurunan skala geometeri (FC = 0,25 dan 0,26 serta 0,3), dimana turbin beroperasi di TSR rendah sangat berbeda dari CRWT pada skala penuh (FC=1,0). Karena CRWT dengan penurunan factor skala geometri rotor yang membuat turbin beroperasi pada TSR rendah ini menyebabkan terjadinya separasi dan vortex di sekitar permukaan blade yang sangat kuat sehingga terjadi peningkatan gaya hambat dan penurunan gaya angkat. Peningkatan gaya hambat pada blade dapat menyebabkan penurunan torsi yang dibangkitkan oleh rotor turbin yang akibatnya menurunkan daya turbin.
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.
PERANCANGAN MESIN PENEPUNG DAUN LAMTORO DENGAN MENGGUNAKAN METODE VDI 2222 Gama, Ronaldo Luis; Bale, Jefri; Tobe, Adi Y.
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 10 No 01 (2023): April 2023
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v10i01.11510

Abstract

The method used in this research is the VDI 2222 method. The process of testing the tool is carried out by turning on the motor, and inputting the lamtoro leaves which will be floured into the tube, the results of the design of the lamtoro leaf powder machine with the VDI 2222 method and the results of the lamtoro leaf flour powder machine test, concluded as follows: Design of a lamtoro leaf crushing machine with engine dimensions, namely: Height 50 cm, Width 30 cm and Length 37 cm, and motor power ΒΌ hp and uses a belt and pulley transmission, by testing the weight of lamtoro leaves, namely 3000 gr (3 kg) with the required time of 420 minutes, then the flouring process is carried out so that it will produce lamtoro flour with a fineness level of 80 mesh. The design stages using the VDI 2222 method are carried out sequentially which can be adjusted to the needs.
Analisis Kekuatan Tarik Pada Jenis Sambungan Hybrid Tipe Lap Joint Komposit Serat Widuri Hule, Esau; Pell, Yeremias M.; Maliwemu, Erich U.K.
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 10 No 01 (2023): April 2023
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v10i01.11667

Abstract

This research was conducted to analyze the strength of this hybrid lap joint type of thistle fiber composite due to tensile loading. The hybrid connection types used are bolted and adhesive connections. Thistle fiber composite has a volume fraction of 30 % and fiber length is 5 mm. To produce a bolted connection, the composite is perforated by drilling. Then it is connected with adhesive to become a hybrid connection. Specimen sizes follow ASTM D5961 standards. In addition to the type of hybrid connection above, the distance of the holes in this connection also varies. From the tensile test results obtained at a hole spacing of 16 mm has a stress of 5.9 MPa, a strain of 0.088 % and a modulus of elasticity of 7.959 GPa. The composite with a hole spacing of 36 mm has a stress of 7.2 MPa, a strain of 0.126 % and a modulus of elasticity of 6.068 GPa. The composite with a hole spacing of 56 mm has a stress of 5.6 MPa, a strain of 0.064 %, and a modulus of elasticity of 10.136 GPa.
ANALISIS SIFAT FISIK DAN SIFAT MEKANIK BATU KARANG DI KUPANG Letto, Robby; Pell, Yeremias M.; Bunganaen, Wenseslaus
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 10 No 01 (2023): April 2023
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v10i01.11670

Abstract

Coral is a natural potential that has not been exploited on a large scale and in this study aims to analyze the physical properties and mechanical properties of coral in Kupang city. and useful for development activities to be safer and smoother. Tools and materials used to analyze the physical properties and mechanical properties of coral such as m esin uji t ekan m ortal, g erinda, m ata p isau p otong keramic, m ata gerinda p smear , betta esi(Ragum), jfigure sfunnel. , the material is in the form of Coral. And all calculations against the compressive strength of the rock.
Eksperimen Rumah Pengering Ikan Sarden Model Ultra Violet (UV) Solar Dryer Kombinasi dengan Sistem Solar Air Heater Melalui Variasi Kecepatan Udara Keluar Punuf, Rolandi; Riwu, Defmit B.N.; Koehuan, Verdy A.
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 10 No 01 (2023): April 2023
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v10i01.11986

Abstract

The technique for preserving a new product is by using a drying technique. The development and utilization of solar energy must continue to be developed with several technologies including the Solar Air Heater. The research method used was an experimental method on Ultra-Violet solar dryer drying houses for drying sardines with additional absorption of solar radiation heat using a solar air heater system. This configuration works by drawing air from the building envelope or from the outside environment and passing it through a collector where the air is warmed by conduction and convection in the absorber. The analysis of this study is regarding the velocity of the airflow coming out of the drying chamber, namely 1.0 m/s, 1.5 m/s and 1.8 m/s, while the airflow velocity in the solar panel (exhaust fan) is 3.5 m/s (constant). The results of the study show that the addition of heat through the solar air heater panel can speed up the drying process in the drying chamber. The temperature difference in the solar panel increases the heat absorbed through the hot air flow which also increases the efficiency of the solar panel. The highest efficiency of the drying house is 48.05 % occurring at the outlet air flow rate of 1.8 m/s. The temperature difference in the drying chamber and the increased ambient air tends to increase the efficiency of the drying chamber where in this study the highest value of 48.05% was obtained at a speed of 1.8 m/s
Studi Pengaruh Perlakuan KOH Terhadap Kekuatan Tarik Komposit Serat Rami Lado, Putra E.; Adoe, Dominggus G. H.; Pah, Jack C.A.
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 10 No 01 (2023): April 2023
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v10i01.11989

Abstract

Currently, natural fiber composites have become the main choice for several industrial applications in the world. The strength of natural fibers such as hemp is based on laboratory results of mechanical strength testing which show that hemp has very suitable properties as a reinforcing composite for prosthetic socket materials. The tensile test is a mechanical stress-strain test that aims to determine the strength of a material against tensile forces. In the test, the test material is pulled until it breaks. Tensile testing is carried out to look for stress and strain (stress-strain test). From this test, we can know some of the mechanical properties of materials that are needed in engineering design. The results of research conducted on the study of the effect of KOH treatment on the tensile strength of hemp fiber composites show three things. First, the highest tensile stress value in hemp fiber was found in the 2% KOH treatment with a long soaking time of 2 hours with a value of 25.3 MPa. Second, the lowest tensile strain value in hemp fiber was found in the 6% KOH treatment with a long soaking time of 2 hours with a value of 0.1%. Third, the highest modulus of elasticity in hemp fiber was found in 6% KOH treatment with a 1-hour soaking time with a value of 47.1 MPa

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