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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).
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Articles 9 Documents
 1 
Search results for , issue "Vol 6, No 2 (2016)" : 9 Documents clear
Development of Ejector Cooling System for Vegetables Products Vacuum Cooling Sulaiman Ali; Desmi Asriandi
Jurnal Teknik Mesin (JTM) Vol 6, No 2 (2016)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

Nowadays, the development of refrigeration technology is more rapidly, the adicted of people to refrigeration system from year to year is always rising,start from the simple scale (eg,refrigerator) in order to safe foods until the big scale such as in industry. The ejector designed will change the capillar tube function or TXV to improve the AC mechine performance. Theoritically,the use of ejector in this research will increase the effect of refrigeration and decrease compression performance. The increasing work of the system will decrease the eletrical energy consumption at the time the air conditioner work. The test in the research is designed in such a manner, so that it can be operated in standard or conventional condition (the system operates normally by using capilar tube) and in the condition of using ejector and doing cooling vacuum. Based on the test by using AC in kind of split with 2 HP Compressor capacity,it is concluded that there has been increasing of COP (Coeficient Of Performance) after using ejector in refrigeration system with vacuum cooling about 1,2 % and also there is retrenchment use of electricity about 0,01 %.
Effect of Printing Pressure to Paving Block with 5% Weight of Added Fly Ash on Compressive Strength Nurzal Nurzal; Edison Edison; Krisna Krisna
Jurnal Teknik Mesin (JTM) Vol 6, No 2 (2016)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

This research aims to investigate the effect of compacting pressure variations with the addition of 5 wt.% fly ash (Fa) on paving block (Pb) in the compressive strength test base on SNI 03-0691-1996. Fa is obtain from waste material produced from coal burning thermal power plant from Sijantang sawahlunto. The growing production of  Fa caused negative environmental impact, so that one of the solutions to overcome that effects is to use the Fa as a raw material for paving block mixture that can reduce the cost of raw material and increase its strength.The fly ash composition in the paving blocks manufacture, that is: 0 wt.%,   5wt.% Fa + block paving material (cement and sand), pressure variation 55, 65, 75, 85 and 95 Kg/cm2 with a drying time for 35 days. The addition of 5 wt.% Fa in paving block is taken based on the results of research conducted in 2013 by using a variation of the composition of 0,5,10,15 wt.% Fa and obtained optimum conditions at 5 wt.% Fa, while the optimal time drying 35 days is taken based on the results of research conducted in 2014 by the drying time variation of 7, 14, 21, 28, 35 days. While the pressure used 75 Kg/cm2, so it is necessary to study based on variations of pressure to get the optimum condition of the paving blocks. Form of test specimens by SNI 03-0691-1996 with paving block size of 20 cm x 10 cm x 6 cm.The test results showed The addition of 5 wt.% Fa increases the compressive strength when compared to 0 wt.% Fa. Optimal compressive strength occurred in paving block compacting pressure 95 kg/cm2 in the amount of 36.1 kg/cm2 with a quality that is used for road on the composition 5 wt.% Fa and 0 wt.% Fa of 30.3 kg/cm2 with quality B parking area. This is because the material fly ash contains oxide compounds that have mechanical properties that are very good and and the size of the fly ash used is very small so as to fill the voids between particles and reduce the porosity of the paving blocks and the higher pressure causes the density of paving blocks increases because bond between the particles is getting stronger. All the results that have made the products meet the quality according to SNI 03-0691-1996.
The Flat Type Heat Pipe Solar Collector: An Experimental Research Dian Wahyu
Jurnal Teknik Mesin (JTM) Vol 6, No 2 (2016)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

Flat solar collectors with heat pipe absorber with dimension of wide 1.5 m x 2 m lenght x 0.2 m thickness and 2.87 m2 aperture area has been tested to produce hot water. Heat pipe used in flat plate solar collector, has a filling ratio of 20% which has been proven to have the highest ability to transfer heat when tested in previous studies. Testing of solar collectors with heat pipe absorber has been done during the month of April 2016 in the city of Padang by using standard ASHRAE 93-2003. The test results showed the highest efficiency obtained was 46%. To get the hot water of at least 64 ° C with a flow rate of 0,35 L / min for 5 hours, required solar radiation of 750 W / m2. Generally, during the trial obtained water output temperature collectors from 8:00 - 9:00 pm and from 15: 30 - 17: 30 is below 60 ° C, whereas at 9:30 - 15: 30 obtained collector output water temperature above 64 ° C, while the water temperature reached at the highest collector output value of 78 ° C.
A Simple Dynamic Signal Analyzer Virtual Instrument To Monitoring and Control Airflow Temperature Asmara Yanto; Anrinal Anrinal; Ryan Adi Pratama
Jurnal Teknik Mesin (JTM) Vol 6, No 2 (2016)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

This work aims to present a Dynamic Signal Analyzer Virtual Instrument (DSA-VI) for monitoring and control the airflow temperature in a prototype of air duct. Here, the DSA-VI has developed by using LabVIEW software and Arduino UNO.  To investigate the performance of DSA-VI, an experiment has performed to monitoring and control airflow at settling temperature, 40oC, 50oC, and 60oC, respectively by using the DSA-VI. By assuming that an airflow temperature control system as the first order system, the time constant (t) should be inspected as one of the system characteristics. The testing at the settling and surrounding temperatures (Tsp and T0) are 40oC and 28.81oC respectively, obtained value of t is 7.49 s; at Tsp and T0 are 50oC and 29.88oC respectively, obtained value of t is 11.35 s; and at Tsp and T0 are 60oC and 28.81oC respectively, obtained value of t is 19.54 s. By using DSA-VI, the value of t at the transient response can be evaluated. At the steady state response, the airflow temperature has controlled well with the steady state error less than ± 2.5 %.
Characteristics of the Mixed Crude Jatropha Oil-Clove Oil Gamayel, Adhes
Jurnal Teknik Mesin (JTM) Vol 6, No 2 (2016)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

Crude jatropha oil (CJO) composed by triglycerides that consist of fatty acid and glycerol. CJO has high viscosity and low evaporation rate that cause ignition delay and imperfect combustion. Blending with lower viscosity and more volatile fuel can reduce it. In this study, CJO blend with clove oil (CO) in percentage of 5%, 10%, 15% and 20%.  The physical properties:  viscosity, heating value, and flash point were measured with international standard method (ASTM). The result indicates that more percentage of clove oil causes viscosity and flash point reduce while heating value increase. There is because molecular interaction between eugenol and triglyceride makes oscillation of molecule more active than before.
Strength Analysis of Betelnut Fiber-Reinforced Resin Composite Fahmi, Hendriwan; Hadi, Syafrul; Kapur, Fajar Marda
Jurnal Teknik Mesin (JTM) Vol 6, No 2 (2016)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

Material is needed in life, the material itself is used aims to facilitate human activities, in the development of modified human material in various ways, one of which composite materials. Composite is a combination of two or more elements that get combined properties of the elements combined. Liquid Epoxy resin is a low molecular weight organic group containing epoxide. The composite material used is a fiber reinforced resin nut shell. Point of this study is know tensile strength of fiber nut shell composite, variations in the composition of the epoxy resin and fiber nut shell made in this study was 90:10%wt, 80:20%wt,  and  70:30%wt,  fiber  length  of  2  cm  with  random  fiber  orientation.  This experiment is the tensile test. Tensile test was conducted to determine the tensile stress each - each composition, the standard used is ASTM 638 02. From the test results obtained on the composition of the composite tensile strength of 90: 10% wt is 9.8 MPa, the composition of 80: 20% wt was 13.06 MPa and the composition of 70: 30% wt is 14.04 MPa. Of the fracture surface can be seen that the fibers are well distributed and the bond between resin and fiber is also more evenly so that the tensile strength increased.
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.
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.
Reverse Engineering of a Hydro Turbine System Mechanical Parts Nofirman Firdaus
Jurnal Teknik Mesin (JTM) Vol 6, No 2 (2016)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

This paper presents a reverse engineering process for mechanical parts of a hydro turbine system. The parts under reverse engineering (RE) are faceplates and bushings. A glance of reverse engineering process is also presented based on the case study. The key to reverse engineering process is determining the key properties of material. Based on the analysis, there are several material properties that would be used for the comparison with the original equipment.The comparison of the final products with the original components shows that faceplates and bushings manufactured from reverse engineering are equivalent to the original components.

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