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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 10 Documents
 1 
Search results for , issue "Vol 2 No 1 (2015): April 2015" : 10 Documents clear
Analisis Desain Turbin Air Tipe Aliran Silang (Crossflow) dan Aplikasinya di Desa Were I Kabupaten Ngada-NTT Verdy Ariyanto Koehuan; Agustinus Sampealo
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 2 No 1 (2015): April 2015
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (165.959 KB) | DOI: 10.1234/ljtmu.v2i1.479

Abstract

ABSTRACT Utilization of water energy potential for the development of hydroelectric power generation systems, especially the use of crossflow type water turbine applications include virtually any location with water flow rate and high head or falling water is low and medium. This type of water turbine performance can be known through the analysis of the turbine runner and the steering nozzle turbine inlet flow and a series of tests in the field. Turbine characteristics to changes in water flow, high water fall (head), angle of attach falling water, and the flow velocity in the runner can be known, and then the application becomes more optimal. With a head of 15 m and and discharge available 230 liters/s, do the design parameters of the length and diameter of the runner, can be obtained specific speed of 47.931 rpm for water discharge 0.1261 m3/s. Dimensional turbine runner DA, (L=15 cm) and (D1=15 cm), turbine efficiency is obtained 88.74 % yield effective power of Pe (16.466 kW). While the dimensions of the turbine runner DB, (L=20 cm) and (D1=20 cm), can be obtained specific speed of 55.346 rpm for the flow rate Q (0.1681 m3/s), and the efficiency of 88.74 % effective at generating power Pe (21.954 kW). The results of the analysis parameters for turbine runner diameter (D1) 15 cm with DA turbine runner length (L=15 cm) to the turbine DB (L=20 cm) showed increase in the flow rate and the effective power as well as 25 %, but the rotation and turbine efficiency does not change.
The Discontinuous Carbon Fiber Composite: A Review of the Damage Characteristics Jefri S. Bale
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 2 No 1 (2015): April 2015
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (133.179 KB) | DOI: 10.1234/ljtmu.v2i1.480

Abstract

Abstract Discontinuous carbon fiber composite (DCFC) is one of new low-cost material product form that had applied for commercial component such as window frames of the Boeing 787 Dreamliner. Study on DCFC was very challenging since it did not have the same nature behavior like conventional composite nor isotropic materials. In this work several studies on damage characteristics of DCFC material were presented. The damage characteristics of DCFC were investigated while undergoing static and fatigue loading. In particular, the damage mechanisms of DCFC were also observed through several nondestructive testing (NDT) methods. The review had shown that the study of DCFC specimen gives an interesting challenges for the future work to understand its damage characteristics and the reliability of the NDT method to study the damage of DCFC material.
Analisis Performansi Turbin Angin Poros Horisontal Model Double Rotor Contra Rotating dengan Posisi Rotor Saling Berhimpitan Fredrikus M. Bere; Verdy Ariyanto Koehuan; Jahirwan Ut Jasron
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 2 No 1 (2015): April 2015
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (226.731 KB) | DOI: 10.1234/ljtmu.v2i1.481

Abstract

Abstract The contra rotating wind turbine is a horizontal axis turbine which has two shaft rotating in opposite directions on the same axis, and it can work at low wind speeds. In general, the performance of the wind turbine are affected by several factors, which is the aerodynamics shape of turbine, the numbers of blade and the selection angle of blade. In this study, conducted by determining the variation of angle on the blade and the blade angle used in the study is 0o, 5o, and 10o, on the two rotors with diameter of front rotor is 0.50 meters and the rear rotor is 0.30 meters, with the position of the rotor blade is coincident with each other. The purpose of this study, is to determine the effect of blade angle variation on the turbine rotation (rpm), torque (T), the power coefficient (Cp), torque coefficient (Cq) and the efficient of the turbine at any wind speeds variations. On the graph relation of blade angle on the shaft rotation, turbine rotation riding known to along with the addition of angle of the blade. The speed of wind is very affect on the output or mechanical power and power coefficient. On the blade angle 0o with wind speed at 4.03 m/s, the power can be generate is 3.013 Watt, and for blade angle 10o with wind speeds 6.08 m/s, the power can be generate is 8.217 Watt. The lowest rotation of rotor without loading is 702 rpm at the wind speeds on 4.03 m/s with angle of blade 0o, the highest rotation of rotor is 1484 rpm on the wind speeds 6.08 m/s with angle of blade 10o. From the graph of analysis data can be seen , with change of angle blade on wind turbine horizontal shaft contra rotating models, power coefficient (Cp) generated of turbine activity increases with increased of angle, with Cp maks 0.718 for angle 10o, maximum efficiency an generated reach out 71.8%.
Pengaruh Kecepatan Angin dan Sudut Blade terhadap Unjuk Kerja Turbin Angin Poros Vertikal Tipe Savonius Duabelas Blade Elfridus Bruno Lake; Muhamad Jafri; Nurhayati Nurhayati
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 2 No 1 (2015): April 2015
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (115.345 KB) | DOI: 10.1234/ljtmu.v2i1.482

Abstract

ABSTRACT This study aimed to determine the effect of wind speed and Blade angle Performance against Vertical Axis Wind Turbine Blade Savonius type. This study is a model made of type Savonius wind turbine blade in a laboratory scale. Dimensions tusrbin Savonius is a diameter of 0.1 meters and height of 0.1 meter, with a vertical rotor position (to facilitate the testing process), so it is assumed the direction of the air flow does not change and lead to the rotor which can be set when testing. The research method is an experiment, by variation of Blade angle -50, 00, 50 and 100. Variations in wind speed of 3.40 m/s, 4.35 m/s and 5.33 m/s. The testing procedure: Each model Savonius turbine rotor blade totaling 12 pieces assembled on Blade holder with angle -50, 00, 50 and 100. Each circuit is then mounted on the stand turbine located at one end of the tunnel and at the other end of the tunnel placed fan, turbine shaft is connected to a pulley as a hanging load. The fan is turned on. After a stable rotation, the wind speed is measured using the anemometer. The results of the research through variations of wind speed and angle of the blade on the performance of vertical axis wind turbine Savonius type, the variation of wind speed of 3.4 m/s, 4.35 m/s and 5.33 m/s showed best performance in blade angle of -50. Performance on the turbine blade angle variation of 00, 50, and 100 to the blade angle -50 occur an average increase of 70.47% power coefficient. The highest maximum output power is 0.282391 Watts (power coefficient of 0.310827), with 274.8864 rotor rpm, and torque variation occurs in 0.00981 Nm -50 blade angle and wind speed 5.33 m / s. Lowest maximum output power is 0.013548 Watts (power coefficient of 0.057451), with 0.000981 Nm torque on the rotor rotation occurs at 131.883 rpm and 50 and the blade angle variation of wind speed of 3.4 m/s by a margin of 84.4% of the highest maximum output power is obtained at an angle of -50 blade.
Pengaruh Perlakuan Alkali (NaOh) pada Serat Agave Cantula terhadap Kekuatan Tarik Komposit Polyester Jorhans J. S. Nesimnasi; Kristomus Boimau; Yeremias M. Pell
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 2 No 1 (2015): April 2015
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (144.152 KB) | DOI: 10.1234/ljtmu.v2i1.485

Abstract

ABSTRACT Purpose of this research is to know the influence of alkali treatment on tensile properties of agave cantula fiber reinforced composite with polyester matrix. Fiber of agave cantula soaked in alkali solution (2% and 5% NaOH) during 2, 4 and 6 hour. After that, the fiber cleaned use water and dried naturally. Matrix which is used in this research is polyester unsaturated resin 157 BQTN with MEKPO hardener. Composite made with method press molding at Vf = 25%. The tensile testing is made related at standard of (American standard of testing materials) ASTM D-638. Tensile testing is done with universal testing machine and the elongations of measured by using meter shove. Result of this research indicate that highest tensile stress obtained on 5% alkali treatment during 2 hour with value is 36,866 Mpa while the lowest tensile stress obtained on 2% alkali treatment during 2 hour with value is 22.707 Mpa. Highest tensile strain obtained on 5% alkali treatment during 6 hour with value 2, 449% while lowest tensile strain obtained on 2% alkali treatment during 4 hour with value 1.780%. Highest Elasticity modulus obtained on 2% alkali treatment during 4 hour with value 18.078 MPa, while the lowest elasticity modulus obtained on the 2% alkali treatment during 2 hour with value 11,203 MPa.
Pengaruh Variasi Fraksi Volume Serat terhadap Kekuatan Bending dan Impak Komposit Polyester Berpenguat Serat Agave Cantula Hendrikus Wona Wona; Kristomus Boimau; Erich U. K. Maliwemu
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 2 No 1 (2015): April 2015
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (191.812 KB) | DOI: 10.1234/ljtmu.v2i1.486

Abstract

Abstract The use of natural fibers as reinforcement material for natural fiber composite materials easily available, cheap, many types and variations. One of the natural fibers that can be used as reinforcement fiber composite is cantula agave plant leaves. In order to create a natural fiber composite material which has good mechanical properties, it should be known factors that affect the manufacture of the composite material. Factors that can affect the mechanical properties of the fiber composite material is fiber orientation, fiber composition, fiber volume fraction and volume fraction of the matrix. Fiber volume fraction is very large influence on the strength of the composite. This study aimed to determine the effect of fiber volume fraction on the bending strength and impact polymer composite reinforce cantula agave fiber with fiber volume fraction of 20%, 30% and 40%. The results showed that the bending and impact strength increases with increasing fiber volume fraction. Greatest bending obtained in the composite with 40% fiber volume fraction of 93.790 MPa and the lowest in the composite fiber volume fraction of 20% of 59.160 MPa, whereas for impact testing biggest impact on the composite with 40% fiber volume fraction of 0.159 Joules/mm2 and low impact strength obtained in composite fiber volume fraction of 20% amounting to 0.113 Joules/mm2.
Expert System pada Komputer paralel Jani F. Mandala
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 2 No 1 (2015): April 2015
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (286.673 KB) | DOI: 10.1234/ljtmu.v2i1.487

Abstract

Abstrak Pemrosesan data bersakala besar dan berbeda-beda sistem sangatlah diperlukan, untuk itu pemilihan proses komputer secara paralel sangat diperlukan. Sebagai acuan pada penulisan ini didekati dengan penggunaan expert system sebagai bagian terkecil dalam sistem relasional data yang melakukan pemroses keputusan. Proses ini digunakan sistem komputer paralel dimana data-data sebelum diproses, diparsialkan dengan algoritma paralel kemudian memanfaatkan beowulf dan pemrogram PVM (paralel virtual mechine) untuk proses komputer paralel. Melalui uraian ini, diperoleh expert system dapat dikembangkan pada sistem komputer paralel menjadi multi platform dan lebih fleksibel dengan membentuk sejumlah paket berukuran matriks. Pemrosesan dapat mengetahui pemrograman paralel dan durasi proses data pada jaringan dan penggunaan komputer paralel tersirap reduksi penggunaan sistem yang baru.
Pengaruh Diameter Katup Limbah dan Jarak antara Katup Limbah dengan Katup Penghantar terhadap Efisiensi Pompa Hidram Mohamad Fajri; Muhamad Jafri; Erich U. K. Maliwemu
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 2 No 1 (2015): April 2015
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (140.519 KB) | DOI: 10.1234/ljtmu.v2i1.488

Abstract

Abstrak Pompa hidram merupakan suatu solusi bagi daerah yang tidak memiliki pembangkit listrik di daerahnya, karena tidak membutuhkan energi listrik atau bahan bakar untuk mengangkat air dari tempat yang rendah ke tempat yang lebih tinggi. Penelitian ini dilakukan untuk mengetahui efisiensi pompa hidram dengan Perubahan diameter katup limbah dan jarak antara katup limbah . Metode yang digunakan adalah metode eksperimen dengan dimensi pompa yang digunakan adalah 2 inchi, memiliki diameter pipa pemasukan 2 inchi dan diameter pipa pengeluaran 1 inchi. Dari hasil penelitian diperoleh hasil bahwa faktor perubahan diameter katup limbah dan jarak antara katup limbah dan katup penghantar berpengaruh pada efisiensi pompa. Efisiensi tertinggi dari hasil eksperimen pada pompa hidram pada diameter katup limbah 0.041 m dan jarak antara katup 0.130 m dengan efisiensi 79,7535 % pada efisiensi D’Aubuission.
Pengaruh Perlakuan Alkali Serat Sabut Kelapa terhadap Kekuatan Tarik Komposit Polyester Rafael Damian Neno Bifel; Erich U. K. Maliwemu; Dominggus G. H. Adoe
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 2 No 1 (2015): April 2015
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (147.381 KB) | DOI: 10.1234/ljtmu.v2i1.489

Abstract

ABSTRAK Kekuatan tarik merupakan salah satu sifat mekanik yang sangat penting dari bahan komposit yang sangat dipengaruhi oleh gaya ikat antara serat dan matrik. Penelitian ini berupaya untuk meningkatkan gaya ikat antara serat sabut kelapa dengan matrik dengan menggunakan perlakuan alkali serat sebelum dipergunakan. Perlakuan alkali dengan melakukan perendaman serat sabut kelapa didalam larutan NaOH 5% selama (2, 4, 6, 8) jam. Setelah dicuci dan dikeringkan serat sabut kelapa dipergunakan sebagai penguat pada komposit matrik polyester 60 %. Hasil yang diperoleh dari pengujian tarik pada penelitian ini menunjukan bahwa dengan fraksi Volume melakukan perendaman serat sabut kelapa kedalam larutan 5% NaOH selama 2 jam dengan harga kekuatan tarik yang optimal dengan nilai 21,075 Mpa, Hal ini juga terbukti dari hasil foto makro penampang patahan, yaitu terjadi patahan komposit untuk waktu perendaman 6 jam dan 8 jam, fiber pull out sedangkan pada waktu perendaman selama 2 jam dan 4 jam, jenis patahan getas.
Pengaruh Temperatur Pengovenan terhadap Sifat Mekanik Komposit Hibrid Polyester Berpenguat Serat Glass dan Serat Daun Gewang Adoniram Sabuin; Kristomus Boimau; Dominggus G. H. Adoe
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 2 No 1 (2015): April 2015
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (307.75 KB) | DOI: 10.1234/ljtmu.v2i1.490

Abstract

Abstract The purpose of this study was to determine the effect of temperature on mechanical properties oven hybrid composite glass fiber and polyester fiber reinforce gewang leaves the fiber volume fraction (Vf) of 32%. Materials used in this study is polyester resin, glass fiber and fiber gewang leaves. Tensile test specimens were made according to ASTM standard D638 while bending test specimens made according to ASTM standard D790. The test specimen by hand lay-up method followed by suppression and left for one day. Furthermore, the composite standard tensile and bending test, then the test specimen treated with different heating. Tensile test results showed that the heat-treated specimens 1000C for one hour has a tensile strength greater than others, amounting to 62.264 MPa, while the lowest tensile strength of 28.805 MPa obtained on specimens that are subjected to 2000C for three hours. Bending test results also showed that the heat-treated specimens 1000C for one hour to have the largest bending strength which is equal to 112.340 MPa, while the lowest bending strength of 57.714 MPa obtained on specimens with heat treatment for 2000C for three hours. The results of the macro picture shows cracks in bending test specimens, whereas the tensile test specimens seen the fiber pullout, debonding and brittle fracture.

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