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METAL : Jurnal Sistem Mekanik dan Termal

metal
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Published by Universitas Andalas

ISSN : 25981137 EISSN : 25974483 DOI : -

Core Subject : Science, Engineering,

Automotive Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

METAL: Jurnal Sistem Mekanik dan Termal translated as METAL: Journal of Systems in Mechanical and Thermal is a scholarly peer-reviewed journal published by Mechanical Engineering Department of Engineering Faculty at Universitas Andalas, Padang, Indonesia. The journal focused on the mechanics and thermal aspects of the mechanical engineering area, and accepted articles are in these subjects: Energy - Renewable energy - Green industry - Energy conversion Mechanical System Engineering - Solid body mechanics - Machine construction - Vibration and control - Mechatronics - Tribology Production System Manufacturing engineering - Product design and development - Production technology - Production logistics and transportation Materials Engineering - Material technology - Nanotechnology

Arjuna Subject : Teknik (semua kategori) - Teknik Mesin

Articles 143 Documents

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Desain Kinematik Alat Pengumpan Material Berbasis Mekanisme Empat Batang Syamsul Huda; Muhammad Jihad Islami; Mulyadi Bur
METAL: Jurnal Sistem Mekanik dan Termal Vol 3, No 1 (2019)
Publisher : Department of Mechanical Engineering, Universitas Andalas

In this paper was studied the design of feeding material system using four bars linkage mechanism. It was carried out dimensional synthesis of the mechanism based on the complex number method. This synthesis is applied to determine the length of crank, coupler, follower and dyad that control of feeding weight. Base on the results, it is obtained that the dimension of the four bars linkage and dyad to control 250 kg weight of feeding material reprsented by lengths of crank, coupler and follower are 1 m, 2 m, and 1 m rspectively and two links of dyad 0.2 m and 0.75 m. It was also determined the constant of spring to support the opening of the feeding material, 23,18 kN/m and input torque, 1083 Nm.

Numerical Calculation of Thermal Stress in Cement Rotary-kiln Foundation at an early age Adek Tasri
METAL: Jurnal Sistem Mekanik dan Termal Vol 5, No 2 (2021): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

This article discusses the early-age thermal stress, caused by the hydration heat, of a rotary kiln concrete foundation. We measure the hydration heat using an adiabatic calorie meter and perform finite volume numerical calculations to obtain the temperature distribution and finite element calculation to determine the thermal stress. The numerical simulation showed significant temperature differences between the core region and surface of the concrete. Compressive stress developed at the core, and tensile stress developed at the surface of the concrete during a heating period. The compressive stress was lower than the concrete compressive strength. The tensile stress was higher than the concrete tensile strength. So that crack developed in the surface. Heat treatment such as post-cooling or pre-cooling was needed to avoid the crack.

Analisa Produk Pola Cetakan Lilin yang Diproduksi Menggunakan DIY-CNC-Endmill Firman Ridwan; Ryan Rahman
METAL: Jurnal Sistem Mekanik dan Termal Vol 2, No 2 (2018)
Publisher : Department of Mechanical Engineering, Universitas Andalas

The use of technology in ring jewelry manufacturers in Indonesia is still very limited. Ring jewelers still use traditional methods in the process of forming mold patterns. This causes difficulties in producing ring jewelry that requires precision and high accuracy on each product. Unprecised wax pattern of ring jewelry can result in dimensional errors when product is manufactured so the dimension is far from the size of the design. To avoid this, it can be overcome by using CNC machine technology. CNC machines can work consistently and precisely. For this reason, therefor, an End-Milling type CNC machines that has accuracy of up to 1/1000 mm is designed. The experiments showed that the results with high accuracy having standard deviation of repeatability of inner diameter 0.020736441, repeatability of outer diameter 0.020493902 and repeatability of thickness 0.043817805.

Analisis Ketersediaan Pasokan Listrik di PT PLN (Persero) UPK Teluk Sirih dengan Metoda Lean Six Sigma Muhammad Dani Gitatisna; Agus Sutanto
METAL: Jurnal Sistem Mekanik dan Termal Vol 5, No 1 (2021): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

This research was conducted to analyze electricity supply availability from the steam power plant at PLN Teluk Sirih. This electricity supply availability is also called the equivalent availability factor (EAF). The regular efforts made to maintain the EAF at PLN are still corrective, by repairing the damage that has occurred, and no systematic method has been implemented. Accurate analysis is required to achieve high EAF values and precision so that the problem's root cause can be resolved. This can be done by using the lean six sigma method. This method can identify waste and solve problems quickly. The methodology used is Define, Measure, Analyze, Improve, and Control (DMAIC). The waste that occurs is a defect, which is the inability of the power plant to supply electricity to customers (PLN P3BS). The identification results show that the factors that influence EAF are boiler tube leak (41.46%), DS Phase S (20.45%), equipment vibration (5.85%), bottom ash system (5.39%), and other disorders (26.84%). The EAF calculation for the last two years is 70.93%, and the six sigma level is 2.05. The improvement design is expected to eliminate boiler tube leak and increases the EAF by 6.65%. Thus, the EAF value becomes 77.85%, and the six sigma level becomes 2.26.

Perawatan Kapal Nelayan Material Fiberglass di Kota Padang Sanny Ardhy; Haznam Putra
METAL: Jurnal Sistem Mekanik dan Termal Vol 1, No 2 (2017): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Fishing boats of fiberglass materials require special care to make the vessel more durable. In the field, often found paint coating ships that have faded and peeling within a few years. Yet it is expected that the vessel can last long to continue to maximize the catch of fishermen. Most of the treatments found on fiberglass boats are light treatments, such as cracks. Cracks from gelcoat and scratches due to impact are maintenance work performed at boat or boat building. The key to fiberglass treatment is how to keep the gelcoat layer of fiber shiny. As is known, layer gelcoat is a very strong layer. But over time, weather changes and exposure to sunlight, this gelcoat layer can fade if not treated properly. In order to avoid these conditions, the most efficient way to do that is coated fiberglass with wax or special polish. Selection of care products for fiber boats also cannot be perfunctory. Certain types of waxes that have anti-ultraviolet rays are highly recommended for treatment. By doing proper maintenance techniques, will make the life of the fiber boat more durable and still look shiny.

Kinematik Forward dan Analisis Kesalahan Pada Kesejajaran Sumbu Join Mekanisme Paralel Rotasi Murni 3-URU Syamsul Huda; Ilham Fahmi; Mulyadi Bur
METAL: Jurnal Sistem Mekanik dan Termal Vol 4, No 1 (2020): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

In this paper we discussed the forward kinematic and constrain error of 3-URU parallel mechanism. The mechanism was composed of URU kinematic chain consisting of three parallel joint axes and two intersecting joint axes. The direction of parallel joint axis representing direction of force constraints acting on center of platform rotation. In this research was investigated the effect of error of direction of parallel joint exes on kinematic chains to the platform orientation and position of center of platform rotation. It is also developed the formulation of forward kinematic of the mechanism. The forward kinematic was carried out by taking account geometric constraint of platform motion which is derived analytically by using software Maple 16. On the other hand, the constraint error was evaluated using the CAD simulation Autodesk Inventor. Based on the result, it can be summarized that error of parallel joint axes produced significant effect on error of platform motion especially for location of the center of platform rotation which is classified as uncompensated error. The formulation of forward kinematic was successfully derived which is confirmed with inverse kinematic and CAD simulation.

Studi performa aerodinamis turbin hidrokinetik Savonius dengan 2 semicircular blade-sharp leading edge Khoiri Rozi; Berkah Fajar; M. Rasyid
METAL: Jurnal Sistem Mekanik dan Termal Vol 6, No 1 (2022): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

This current investigation was conducted to study the aerodynamic characteristics of Savonius hydrokinetics turbine with semicircular blade-sharp leading edge. The influences of blade thickness and freestream velocity were simulated using ANSYS FLUENT with k-w SST model. The results show that the flow structure changes with increasing turbine rotation in which the flow complexity is formed at a larger rotation angle. The coefficient of torque and power for thin blades is higher than for thicker turbine blades and its values increase with the increase in the freestream velocity.

Analisis Kegagalan Pada Roda Gigi Miring Intermediate Gear 2 Pada Gear Box Untuk Roller Press Milling Machine Andri Anto; Dedison Gasni
METAL: Jurnal Sistem Mekanik dan Termal Vol 1, No 2 (2017): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

This paper reports the result of an investigation of a fatigue failure of a helical gear in a reducer gear box used in roller press milling machine. Standard procedures in stress analysis on helical gear were used in failure analysis of this helical gear. It was found that the gear failed by fatigue fracture. Beach marks on the fracture surfaces were clearly visible. Detail examination of the surface of the gear revealed that extensive surface damage had occurred in the form of pitting and scuffing. Sub-surface damages in the form of spalling were also observed. Such observations indicated that the gear was under excessive contact stress during operation. Stress analysis did, in fact, confirm such hypothesis. Stress analysis has been conducted by using Niemann methods and Lewis equation. Finite element methods also have been conducted by using commercial software where the stress was obtained on the root of gear by modeling with pitting, without pitting, and matting. The results show that the working stresses on the root of gear were lower than strenght of gear material. It was proofed that the gear failure due to dynamic loading but not because of static loading. These surface and sub-surface damages leed to fatigue crack initiation followed by crack growth and eventual fracture excessive contact stress. It is showed that from contact mechanic analysis showed that Hertzian stress and shear stress at surface and at sub surface were excessive. It is concluded that the helical gear failed by fatigue fracture initiated by surface and sub-surface damages resulting from excessive contact stress.

Analisis Kinerja Pengering Surya Photovoltaic Thermal (PV/T) pada Kondisi Tanpa Beban Een Tonadi; Adjar Pratoto
METAL: Jurnal Sistem Mekanik dan Termal Vol 3, No 2 (2019)
Publisher : Department of Mechanical Engineering, Universitas Andalas

The present paper is concerned with experimental study of thermal performance of a Photovoltaic/Thermal (PV/T) tray dryer. The PV/T tray dryer considered consistes of a solar cell module of 100 WP integrated with a cabinet dryer. The cabinet dryer is covered with tranparent UV plastics allowing direct heating from solar radiation The ccoling air of the solar cell is used as drying medium and circulated by solar cell powered DC fans. The experiment was performed under no load condition at different weather conditions, i.e on a cloudy day and a clear day. During the experiment, the daily average solar radiation and ambient temperature are respctively 324,7 W/m2 and 26,5oC (cloudy day) and 727 W/m2 and 27,9oC (clear day). The maximum air temperatures attained in the dryer chamber are 34,4oC (cloudy day) and 40,5 oC (clear day). There is air temperature variation among the trays, however the variation is insignificant, only at the order of 1-3oC.

Perancangan Cetakan Injection Molding Hand Press Untuk Produk Slide Piece CVT Menggunakan FEM Alfan Ekajati Latief; Lutfi Darusman; Wibowo Pria Fahla; Ahmad Dzilfairuz Zaidan; Nuha Desi Anggraeni
METAL: Jurnal Sistem Mekanik dan Termal Vol 5, No 2 (2021): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

The development of composite materials in the automotive industry has reached the stage of utilizing natural fibers to pursue relatively low material prices with the same quality. One method for product formation is injection molding. This study aims to design the most efficient mold from a variety of shapes, dimensions, and runner types used with the help of SolidWorks software. The tool used to support the design of the mold is a low-pressure injection molding hand press with a barrel temperature specification of 200 C - 250 C, barrel volume of 270 cm3, and an out-of-nozzle diameter of 8 mm. The most efficient design is determined from three multi-cavity models with different shapes. This research produces a two-plate mold with multi-cavity modeling which has a low-pressure parameter of 1.89 MPa and the shrinkage factor is still within the standard range of PPHI material (< 1%).

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Contact Name
Lovely Son

Contact Email
lovelyson@eng.unand.ac.id

Phone
+6281213552846

Journal Mail Official
metal@eng.unand.ac.id

Editorial Address
Kampus Limau Manis, Jurusan Teknik Mesin, Fakultas Teknik, Universitas Andalas

Location
Kota padang,

Sumatera barat

INDONESIA

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Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name Lovely Son

Contact Email lovelyson@eng.unand.ac.id

Phone +6281213552846

Journal Mail Official metal@eng.unand.ac.id

Editorial Address Kampus Limau Manis, Jurusan Teknik Mesin, Fakultas Teknik, Universitas Andalas

Location Kota padang, Sumatera barat INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Contact Name
Lovely Son

Contact Email
lovelyson@eng.unand.ac.id

Phone
+6281213552846

Journal Mail Official
metal@eng.unand.ac.id

Editorial Address
Kampus Limau Manis, Jurusan Teknik Mesin, Fakultas Teknik, Universitas Andalas

Location
Kota padang,

Sumatera barat

INDONESIA