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Jurnal Teknik Mesin
Published by Institut Teknologi Padang
ISSN : 20894880     EISSN : 25988263     DOI : https://doi.org/10.21063/jtm
Core Subject : Science, Engineering,
Control & Systems Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
JTM is a journal aims to be a peer-reviewed platform and an authoritative source of information. We publish original research papers, review articles and case studies focused on mechanical engineering and other related topics. All papers are peer-reviewed. JTM is managed to be issued twice in every volume (April and October). The Scope of JTM is: Energy Science and Engineering Applied Mechanics and Materials Design, Manufacturing and Product Development Control, Instrumentation and Robotics
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 247 Documents
 15   16   17   18   19 
EFFECT OF AIR DRYING TEMPERATURES ON THE QUALITY OF CENTELLA ASIATICA L DRIED PRODUCTS M. Yahya
Jurnal Teknik Mesin Vol 1 No 2 (2012): Jurnal Teknik Mesin Vol.1 No.2 April 201`2
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtm.2012.v1.i2.15-23

Abstract

The objective of this study is to evaluate the effect of air drying temperature on the quality of Centella Asiatica L. The drying was conducted by using a constant temperature and humidity drying chamber at different drying temperatures and relative humidities (35oC, 45oC, 55oC, 65oC; 10%, 20%, 30%, 40%, 50%), respectively. Color of Centella Asiatica L was measured using a Chroma meter and the madecascosside and asiaticosside in Centella Asiatica L were identified and quantified using High Pressure Liquid Chromatography (HPLC). The results showed that the color quality of Centella Asiatica L for the drying temperature below 55oC was decreased but not significantly. The decreasing color quality was significant at temperature beyond 55oC and at higher relative humidity. This is caused by longer drying time to achieve equilibrium moisture content. The active ingredient (madecascosside and asiaticosside) in Centella Asiatica L was decreased at temperature beyond 55oC. Based on the results the quality of Centella Asiatica L can be preserved if the drying process was maintained at temperature less than 55oC. Also the results obtained from this study can be used to design a solar drying system for Centella Asiatica L and other medicinal herbs.
ANALISA KEKERASAN PADA TARIKAN 2%, 4% DAN 8% BAJA BASE DAN BAJA Cu UNTUK MENDAPATKAN KEKERASAN PADA  DAN  ’ Nofriady Handra
Jurnal Teknik Mesin Vol 1 No 2 (2012): Jurnal Teknik Mesin Vol.1 No.2 April 201`2
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtm.2012.v1.i2.30-33

Abstract

This study will discuss change in tensile behavior as a function of vol.% of α’ in copper free and copper bearing dual phase steel. Microstructures of the steels after solution treatment and annealing at intercritical region are lath martensite and (α+α’) dual structures, respectively. The temperatures for annealing were determined using C for 30 sec and followed by water quenching. Then, each°JMatPro 4.1. Specimens were austenised at 1000 type of specimens were heat treated at specific temperatures in order to obtain 20% and 80% of martensite. Beside that, for get hardness values each samples, the samples strain at 2%, 4% and 8% tensile test for base steel and Cu steel. Changes of hardness of annealed samples almost the same in both steels. On the other hand, it is found that addition of copper can improve tensile strength, total elongation and strength-ductility balance of the DP steel although no significant effect on yield stress and uniform elongation. Therefore, it can be concluded that the copper bearing DP steel has more excellent tensile properties than the copper free DP steel.
EXPERIMENTAL STUDY OF THE ABSORBTION AIR CONDITIONING SYSTEM OF LITHIUM BROMIDE Hariadi
Jurnal Teknik Mesin Vol 2 No 1 (2012): Jurnal Teknik Mesin Vol.2 No.1 Oktober 2012
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtm.2012.v2.i1.1-6

Abstract

The optimum performance of air conditioning system has been studied. The air conditioning system consists of a generator, a condenser, a evaporator, an absorber, pump and piping. The design and the analysis of the system is touse electrical heater for heating in the generator which has been designed, fabricated, and tested. LiBr-H2O in the generator vaporises. The high temperature and pressure vapor is passed to the condenser, and the vapor changes to be liqiud, and then passed to the evaporator to provide the cooling. In the absorber, the strong solution absorbs the water vapor leaving the evaporator to form the weak solution which is re-circulated back to the generator. The experimental equipment was tested at the generator temperatur of 60oC, 70oC, and 80oC. The data logger was uded to measure the temperature of absorber, the condenser, and the generator. The high Coefficient of Performance COP of 0.67 is obtained from the LiBr solution the concentration of 40% with the pump flow rate of 0.03 kg/s. The lowest temperature of the evaporator achieved was 19.43oC, which can be used in the internal air conditioning, while the ambient temperature 29oC. The study has shown that a simple equition was abtained (Y1=0.0016 X1+0.2188) for designed generator, where Y1 = achieved vapor volume in the generator is divided with generator volume, X1 is concentration of the LiBr solution and 0.2118 is a constant.
KAJI EKSPERIMENTAL UNTUK MENINGKATKAN PERFORMASI DESTILASI SURYA BASIN TIGA TINGKAT MENGGUNAKAN BEBERAPA BAHAN PENYIMPAN PANAS Mulyanef; Melda Sari; Wira Mario; Henry Nasution
Jurnal Teknik Mesin Vol 2 No 1 (2012): Jurnal Teknik Mesin Vol.2 No.1 Oktober 2012
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtm.2012.v2.i1.17-12

Abstract

Tujuan penelitian ini adalah untuk meningkatkan prestasi dari alat destilasi surya basin tiga tingkat dengan menggunakan berbagai bahan penyimpan panas (aluminium, stainless steel dan seng), alat uji destilasi surya ini dapat berproduksi terus menerus selama 24 jam. luas kolektor bagian bawah 0,65 m2 , bagian tengah 0,4 m2 dan bagian atas 0,4 m 2 . Prinsip kerja alat yaitu radiasi matahari dirubah menjadi energi panas pada kolektor, panas akan terkumpul di dalam plat penyerap dan memanaskan air laut yang berada pada setiap basin. Untuk meningkatkan produktivitas air bersih, diletakkan bahan penyimpan panas pada basin bagian bawah. Hasil pengujian menunjukkan pemakaian stainlees steel sebagai penyimpan panas dapat menghasilkan produktivitas air bersih lebih tinggi dibandingkan dengan bahan penyimpan panas dari seng dan aluminium.
PENGARUH α-CASE DAN ANGKA KEKERASAN (SIFAT MEKANIK) TERHADAP LAJU PERUBAHAN ELONGASI (DEFORMASI) MATERIAL Ti6AL4V HASIL PROSES SUPERPLASTIS FORMING Armila
Jurnal Teknik Mesin Vol 2 No 1 (2012): Jurnal Teknik Mesin Vol.2 No.1 Oktober 2012
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtm.2012.v2.i1.13-19

Abstract

Superplastic materials may be stretched in tension to elongations typically in excess of 200% and more commonly in the range of 400–2000%. There are rare reports of higher tensile elongations reaching as much as 8000%. The high ductility is obtained only for superplastic materials and requires both the temperature and rate of deformation (strain rate) to be within a limited range. The temperature and strain rate required depend on the specific material. A variety of forming processes can be used to shape these materials; most of the processes involve the use of gas pressure to induce the deformation under isothermal conditions at the suitable elevated temperature. The tools and dies used, as well as the superplastic material, are usually heated to the forming temperature. There are a number of commercial applications of super-plastic forming for aerospace, Examples are wing access panels in the Airbus A310 and A320, bathroom sinks in the Boeing 737, turbo-fanengine cooling-duct components, external window frames in the space shuttle, front covers of slot machines.
PERAMBATAN RETAK (CRACK PROPAGATION) TAP BOLT UNC - OIL COATED ASTM 325 Trisna Putra
Jurnal Teknik Mesin Vol 2 No 1 (2012): Jurnal Teknik Mesin Vol.2 No.1 Oktober 2012
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtm.2012.v2.i1.20-25

Abstract

Have done a series of studies of crack propagation that trigger the failure of a component machine tap bolts of ASTM 325 standard type as the completeness of the machine elements. From the data analysis carried out showed that the initial microscopic crack starting line with the outer screw rotation groove tightening screw on the event. Triggers visible failure of the voltage degradation around where the defect on the outer as the main trigger. Furthermore, it can be concluded that the manufacturing process and the lack homogenan bolt material becomes the main character of failure.
PENGARUH POSISI BAUT GALVANIS DAN STAINLESS STEEL DITINJAU DARI FRACTURE SURFACE PADA SAMBUNGAN PLAT Nofriady Handra; Brazi
Jurnal Teknik Mesin Vol 2 No 1 (2012): Jurnal Teknik Mesin Vol.2 No.1 Oktober 2012
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtm.2012.v2.i1.26-34

Abstract

This study is an experimental study using the UTM (Universal Testing Machine) where the bolts are the main object of the test. Testing independent variables are used only in the varying positions. Testing was conducted using 3 (three) bolts located at the 5 (five) pieces in a jig (test tool of the shear bolts), with different positions for each test. Number of bolt position is that as many as 5 variations of the entire position will be obtained in the optimal position to receive style. Objectives to be achieved is to know the phenomena that occur in the process of loading on the bolts. Besides the above objectives, this study also to identify and analyze the characteristics of the material properties of the shear plate is fastened with two bolts, on a variety of positions so we get a position that would result in fracture or shear bolt receiving optimal shear forces. Optimal position to receive a shear force is position 2 and 3. The position is not optimal receive shear force is position 4.
PENGARUH KOMPOSISI FLY ASH DAN SUHU SINTER TERHADAP DENSITAS PADA MANUFACTURE KERAMIK LANTAI Nurzal; Antonio Eko Saputra. N
Jurnal Teknik Mesin Vol 2 No 1 (2012): Jurnal Teknik Mesin Vol.2 No.1 Oktober 2012
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtm.2012.v2.i1.35-40

Abstract

dan kekerasan Vickers keramik lantai dari fly ash yang telah di-vitrifikasi. Fly ash yang digunakan berasal dari sisa pembakaran batu bara pada pembangkit listrik tenaga uap dari Sijantang Sawahlunto. Pertambahan jumlah produksi fly ash menyebabkan dampak negatif pada lingkungan, sehingga salah satu solusi untuk mengatasi dampak tersebut adalah dengan cara memanfaatkan fly ash yang telah di-vitrifikasi sebagai raw material untuk membentuk keramik lantai. Dalam penelitian ini, komposisi bahan dibuat dengan mencampurkan 50 % berat fly ash vitrifikasi (Fav) + 40 % berat clay + 10 % berat batu kapur, 70 % berat fly ash vitrifikasi (Fav) + 24 % berat clay + 6 % berat batu kapur dan 90 % berat fly ash vitirfikasi (Fav) + 8 % berta clay + 2 % berat batu kapur. Spesimen uji dibuat berbentuk silindris dengan diameter 15 mm dengan tekanan sebesar 120 MPa. Spesimen uji kemudian di-sinter pada suhu 1050, 1100, 1150 oC dengan laju pemanasan 10 oC/menit. Hasil penelitian menunjukkan bahwa kondisi optimal densitas terjadi pada spesimen (50 % berat fly ash vitrifikasi + 40 % berat clay + 10% berat batu kapur) pada tekanan 120 MPa dan suhu sinter 1150 oC, yaitu densitas sebesar 2,48 gr/cm3 .
SOLAR ASSISTED DRYING SYSTEM M. Yahya
Jurnal Teknik Mesin Vol 2 No 1 (2012): Jurnal Teknik Mesin Vol.2 No.1 Oktober 2012
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtm.2012.v2.i1.49-55

Abstract

A solar assisted drying system has been designed, fabricated, and evaluated. The main components of the drying system consist of a solar collector, an energy storage tank, an auxiliary heater, two blowers, two adsorber columns, two water-air heat exchanger, two water circulating pumps, a drying chamber and other ancillary equipment. The solar collectors used were 60-evacuated heat pipes tube arranged in parallel with total area of 6 m2 . The area of absorber in tube each individual was 0.1 m2 , and distance between the tubes was 7.1 cm. The objective of this study is to evaluate the contribution of solar energy to drying system for drying Centella Asiatica L (heat sensitive product). A computer program was developed in MATLAB software to calculate the contribution of solar energy to drying system. The results found that the total energy required by drying system for drying Centella Asiatica L from initial weigh of 3 kg to final weigh of 0.37 kg over drying time of about 12 hours at an air velocity is 3.25 m/s was found 47609 kJ. This energy contributed by solar collector, auxiliary heater and pump and blower of about 25315 kJ, 17829 kJ and 4464 kJ, respectively. The maximum values of solar fraction (SF) was found 97 %.
ANALISIS PENGARUH PERBANDINGAN DIAMETER MINOR DAN MAYOR ELIPS TERHADAP NILAI KOEFISIEN DRAG MENGGUNAKAN PROGRAM CFD Afdhal Kurniawan Mainil; Fauzan Andreas; Helmizar
Jurnal Teknik Mesin Vol 2 No 1 (2012): Jurnal Teknik Mesin Vol.2 No.1 Oktober 2012
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtm.2012.v2.i1.56-64

Abstract

The rapid development of science and technology to inspire people to create something useful for human life itself. One example is the use of a cylindrical body which can be found on the heat exchanger (heat exchanger) is on shell and tube, chimney, and support offshore platforms. In this case, to obtain an optimum value as well as building construction and minimal ideal would be a mistake, it is necessary to know the characteristics of flow through the body. One of the characteristics of the flow is fluid flow through the cylinder body. Fluid passing through a cylindrical body will result in drag force. Research on the external flow across a body has done much to reduce the drag force. One was to replace the cylinder body with an elliptical geometry. In the present study will be conducted using the CFD numerical model with a test that is circular and elliptical cylinders. In the test model ellipse major and minor diameter ratio is varied (50mm/100mm, 50mm/120mm, 50mm/150mm, 50mm/180mm). In each test model will be calculated the value of the coefficient of drag is happening. The results of the simulations is the use of an elliptical body geometry can reduce the value of the coefficient of drag (CD) of 0.2519 on the minor and major diameter ratio (a/b = 50mm/150mm) than the circular cylinder with a drag coefficient (CD) of 0.5485 and the ratio of diameter minor and major of the most effective to reduce the coefficient of drag on the ellipse is (a/b = 50mm/150mm) than the minor and major diameter ratio (a/b = 50mm/100mm), (a/b = 50mm/120mm), (a/b = 50mm/180mm).

Page 17 of 25 | Total Record : 247

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