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Jurnal Teknik Mesin
Published by Institut Teknologi Padang
ISSN : 20894880     EISSN : 25988263     DOI : -
Core Subject : Engineering,
Mechanical Engineering
Jurnal Teknik Mesin (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 by at least two referees. JTM is managed to be issued twice in every volume (April and October).
Arjuna Subject : -
Articles 158 Documents
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Influence of Chemical Composition and Chrome Plating Duration on Thickness and Hardness of the Surface Coating on the Brass Plate Syafrul Hadi
Jurnal Teknik Mesin (JTM) Vol 6, No 1 (2016)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

In the metalworking technology, the electroplating process is categorized as a process of late. Electroplating can be interpreted as a metal coating process by using an electric current, wherein the anode used is chromium, but it also is the chemical composition that is acidic chromium, sulfuric acid, sulfuric and hydrochloric acid, are used to move the particles of the metal coating to the material to be coated , The objective of the research is to see the influence of the chemical composition of the solution to the thickness and hardness of the coating, the effect of long time coating thickness and hardness of the surface coating on the brass plate. Benefits of the research carried out to improve the quality of products in terms of physical, increase corrosion resistance, and increase violence. In this study specimens used rectangular brass plate with a size of 60 mm x 40 mm x 1.5 mm. Chromium electroplating process using a solution by varying the chemical composition of the solution and long plating time 20 minutes, 25 minutes and 30 minutes. Thickness testing conducted by means of Optical Microscope microstructure whereas hardness testing conducted by Micro Hardness Tester with a load of 9807 N. The results of this study showed that the thickness of the layer of the highest at 30 minutes with the chemical composition of the acid solution of chromium (CrO3) 200 grams / liter, sour sulphate (H2SO4) 30 g / liter of 32.85 μm while the highest hardness layer at the time of 25 minutes with the chemical composition of the acid solution of chromium (CrO3) 200 grams / liter, sulfuric acid (H2SO4) 30 g / liter of 112.67 VHN.
Effect of Aluminium and Copper Powder Addition in Alumina Matrix on Bending Strength Hendriwan Fahmi; Sulaeman Ali
Jurnal Teknik Mesin (JTM) Vol 6, No 1 (2016)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

Experimental Study of Vibration of Shaft-Rotor System Due to Imbalance Asmara Yanto; Rozi Saferi
Jurnal Teknik Mesin (JTM) Vol 7, No 2 (2017)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

In this study, vibration of shaft-rotor system as a part of rotating machinery prototype due to imbalance has been monitored, processed and analyzed by a dynamic signal analyzer virtual instrument (DSA VI). The rotating machinery prototype consists of an AC induction motor, a pulley-belt system, and a shaft-rotor system supported by two bearings. Two discs were placed between two bearing housings. On both discs are added and placed additional mass as unbalance mass on shaft-rotor system. Unbalance mass placement is varied with different of angle orientations i.e. 0o, 30o, 60o, 90o, 120o, 150o and 180o between on both discs. DSA VI consists of four micro-electro-mechanical system (MEMS)-based accelerometers type ADXL335 that placed on the bearing housings, a data acquisition device and a data analyzer device. The four accelerometers serve to convert the mechanical quantities of measured vibration acceleration into electrical quantities in mV. Vibration signal in mV is acquired by the data acquisition device. Data sampling rate is set at control panel of the data analyzer device. Measurable vibrations in the time domain are displayed by the data analyzer device in a computer. Vibration in time domain is transformed into frequency domain by using fast fourier transfrom (FFT) method. From this experimental study of vibration of shaft-rotor system due to imbalance obtained the highest vibration amplitude for unbalance mass placement with different of angle orientation is 30o between on both discs. If unbalance mass placement with different of angle orientation is greater than 30° between on both discs, then amplitude of vibration due to imbalance will decreases.
AFR Modeling of EFI Engine Based on Engine Dynamics, Vehicle Dynamics, and Transmission System Suroto Munahar; Muji Setiyo
Jurnal Teknik Mesin (JTM) Vol 7, No 1 (2017)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

During this time, the AFR control systems on the Ligh Duty Vehicles (LDVs) generally only engage the engine condition, such as manifold pressure, engine speed. In fact, fuel consumption is not only influenced by the engine dynamics but also influenced by outside factors such as gear position (transmission) and vehicle speed. Therefore, this paper presents a simulation to control the Air to Fuel Ratio (AFR) on Electronic Fuel Injection (EFI) engine that accommodated engine dynamics, vehicle speed dynamics, and gear position dynamics (transmission). Fuzzy Logic Controller (FLC) was selected for AFR modeling because of the engine work in a non-linear condition. The simulation results show that the model developed is able to control the AFR on the vehicle speed changes. Even, the system is able to perform fuel cut-off at the time of deceleration from high speeds. 
Numerical Analysis of Aeration Flow by Using Finite Differences Method on The Substances Heap Model in Storage Yanto, Asmara
Jurnal Teknik Mesin (JTM) Vol 7, No 1 (2017)
Publisher : ITP Press - Institut Teknologi Padang

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Abstract

The substances heap in storage requires good air flow to keep condition of the substances; particularly they are sensitive substances to specific properties of air that flow around it such as velocity and pressure. Commonly, properties of air in storage flow with low velocity and pressure that called with ?aeration flow?. At this article, an analysis have done to two-dimensions aeration flow of substances heap modelling in storage where position of inlet aeration at middle-top boundary and position of outlet aeration at left-bottom and right-bottom boundaries. Analysis done by focused to distribution of aeration volume flow rate using numerical analysis as potential flow with finite difference method. Distribution of aeration volume flow rate that determined from various of substances height to storage height percentage make different aeration flow contour. A substance height to storage height percentage that makes level of uniformity of colours that almost flattens of aeration flow contour is a compatible variable in placing substances in storage.
Effect of Cyclone Diffuser Swirl throughout 30 mm On Liquid Jet Gas Pump (Application on Frying Pineapple Chips) Eswanto Eswanto
Jurnal Teknik Mesin (JTM) Vol 6, No 2 (2016)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

Pineapple is a plant that is widely available in Indonesia and fruit favored by the public. Some areas in North Sumatra as langkat, Binjai, Berastagi, Siborong-borong many supply pineapples to the city field, so if at the time of pineapple fruit season arrives, the city became a flood pineapple field and consequently if the fruit is not sold will be rotten. Seeing this need to utilize technology in order not rotten pineapple and wasted, therefore there is need to do an experiment to make a pineapple into chips with technology liguid jet gas pump (LJGP) which method a way with a vacuum system. From the problems necessary to study to get the best vacuum LJGP tool is one of them by adding a Cyclone vortex diffuser models. The purpose of this study is to obtain the best vacuum as well as the efficiency of LJGP that can be used in frying applications pineapple crisps vacuum method along the vortex diffuser 30 mm. The research method with experiments involving fluid water and air, by adding a Cyclone vortex Diffuser models in LJGP tool as long 30 mm. The observed data is the primary flow rate (primary flow / motive flow) is 0.32 L / s, up to 0.44 L / s and discharge secondary flow (secondary flow) ranged from 0.04 L / s to 0.2 L / s. As for the water to circulate fluid LJGP, used types of centrifugal pumps with a capacity of 340 L / min. From the research that has been done shows that the more points cyclone vortex diffuser, the secondary pressure will increase. The maximum secondary pressure in the cyclone vortex diffuser length 30 mm which is 150 215 kPa, with secondary pressure maximum of 12 GPM is present in 1,367 kPa. This condition is informed that the use of models in the vortex of Cyclone Diffuser LJGP tool is in need to improve the vacuum system for LJGP.
Improved Performance of the Vapor Compression Cooling System Using A Combination of Condensers-Evaporative Cooling Arfidian Rachman; Sulaeman Sulaeman; Syafrul Hadi
Jurnal Teknik Mesin (JTM) Vol 8, No 1 (2018)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

Energy use is a major problem in the vapor compression air cooling system, especially in areas with very hot weather conditions. In hot weather conditions, the performance of the system has decreased dramatically and electricity consumption has increased significantly. Combined Condensor with evaporative cooling will increase the heat removal process by using an evaporative cooling effect that will increase the efficiency of energy use. This paper presents the study of the use of evaporative cooling and condenser. This paper mainly calculated energy consumption in steam compression cooling systems and related problems. From the results of this study, the use of condensers with evaporative cooling, power consumption can be reduced to 46% and performance coefficient (COP) can be increased by about 12%, with 1,2 kW cooling capacity.
Automatic Sand Sieving Machine with Three Sieves Nofriady Handra; David A; Randa J
Jurnal Teknik Mesin (JTM) Vol 6, No 1 (2016)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

Sand is the base ingredient in the development process. In addition, the material can not be separated sand use in the industrial world. Often in industrial buildings and workers needed sand material that has been processed. Sand material is usually still mixed with rocks or gravel. To get fine sand material, do the sifting process. The sieving process is carried out in order to get ready for the sand used in the process. The design of this sand sifter tools will provide convenience and a better process when compared with the work done traditionally. Benefits of making the application of automatic sand sieving machine can help the construction workers, especially in the process of building the sand processing to bebepara functionality and usability. And can be used to produce maximum results in conditions that are not limited in the field. The purpose of making sand sifter tools this automated system is to ease the work in process and streamline the sifting sands of time, economic and workforce. The process of making this tool consists of four main processes, manufacture sifter, frame and hopper manufacture, manufacture of other supporting components, and assembly of all components. From the results of tests and experiments, that for 20 kg of the starting material that contains sand and stone (gravel) are processed only takes approximately 25 seconds to produce three types of the filter sand and stone as well. In general, the innovation of this tool enabled us to increase production of larger sieve in a short time, for development work on a large scale, this tool is suitable for generating a large amount of production that would be more economical in terms of time and cost.
Corrosion Resistance Test Using Gravimetric Method on Fuel Tanks of Ethanol Fuel Vehicles Muji Setiyo; Saifudin Saifudin; Abdul Wahid Jamin; Rifqi Nugroho; Muhammad Rizal Ibrahim
Jurnal Teknik Mesin (JTM) Vol 7, No 2 (2017)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

In the next few decades, ethanol will take on the role of replacing fossil fuels. However, for direct application to the existing vehicles, an assessment of the corrosion resistance of the fuel tank is required. Therefore, this paper presents the results of corrosion resistance investigation of fuel tanks due to the application of ethanol. A Gravimetric method is used to test the corrosion. Ethanol is mixed with NaCl at various percentages as a corrosive medium. The test results show that the fuel tank has good resistance to corrosion due to ethanol use. 
Modal Analysis of Free-Inverted Wilson Tennis Racket with 1st Type and 2nd Type of Damper Rozi Saferi; Asmara Yanto; Ismet Eka Putra
Jurnal Teknik Mesin (JTM) Vol 6, No 2 (2016)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

One way that can be used to analyze vibration in structures is the modal method of analysis. With this method vibration can be measured when the structure is working, so get the form of vibration mode and vibration values with different frequency levels. If the frequency of the structure in operation is known, then the structure can be controlled so that it does not work on its private frequency, so that the vibrations that occur in the structure are at a safe level. The objective of this research is to know the mechanism of reconstruction of disturbance force on tennis racket structure that vibrates and determines the personal frequency through the test. Then determine the time-frames style graph. In testing, the Wilson brand test racket was given a type 1 and type 2 damper with a weight of 320 grams and a 697mm long vertical hanging with a free-to-pedestal condition. After the software was run, an excitation style with impact hammer was applied to the top of the racket. Measurement of response is done by recording FRF (frequency domain) and coherence graph. The sampling results are stored in * .txt extensioned files and processed with microsoft excel to get real FRF and imaginary FRF graphics. The test is done several times by varying the accelerometer position of 8 points and 2 types of silencer. From the capital test the analysis of the specimen is hung freely with the silencer, then obtained the personal frequency of the test racket with a lower silencer than the personal frequency of the system without damper with a difference of 2 Hz. The three lowest vibration modes of the free-hanging system of the experimental results are the first mode of a half-wave graph forming a peak, the second mode being a one-wave graph forming a single valley peak, and the third mode being a one-and-a-half wave graph of the two valleys. The damping of the test structure is different at each test point and at any given frequency range.

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