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Dinamika Teknik Mesin
Published by Universitas Mataram
Invite you to write a manuscript and submit it online at dinamika.unram.ac.id, to be published in July 2018. For all authors, once your manucripts are reviced, please kindly send your manucripts back to the editor as soon as possible for further processes.
Articles
153
Articles
Analisa surface defect pada baja slab (Studi kasus di slab steel plant PT. Krakatau Steel-Cilegon)

Sari, N.H., Yatra, I.W.

Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Article in Press, In Progress
Publisher : Universitas Mataram

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Abstract

The purpose of this case study is to analyze the surface defects that occur in slab steel. Investigations and observations have been made on slab steel. Surface defects that were investigated were obtained based on survey data in slab handling. The results show that frequent surface defects are transverse crack, corner transverse crack, corner crack, longitudinal crack, porous / blow hole, and oscillation mark. Further, the type of surface defect that often occurs in steel slab is the type of corner crack. It is due to sulfur and phosphorus content on the slab steel grade are higher.

Pengaruh variasi campuran bahan bakar tongkol jagung dan tempurung kelapa terhadap unjuk kerja tungku biomassa

Joniarta, I.W., Wijana, M., Triadi, A.A. Alit, Iswara, I.B.K.T.H., Adhi, I.G.A.K.C.

Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 8, No 2 (2018): Dinamika Teknik Mesin, 10 articles
Publisher : Universitas Mataram

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Abstract

Agricultural waste such as corn cobs and coconut shell can be used as alternative energy. Biomass as an alternative energy can be used as a fuel in the furnace. Corncob has low calorific value and density, so it is necessary to examine the combination’s effect of corn cobs and coconut shell toward the performances of biomass furnace.The gasification furnace was the development of a furnace design on previous research. Diameter of combustion chamber is 25 cm, diameter of free air duct and secondary air duct is 2 cm, and primary air duct is 1 cm. Combined corncob and coconut shell in sequence are 100%: 0%, 80%: 20%, 60%: 40%, 40%: 60%, 20%: 80%, 0%: 100%. Investigated parameters showing the furnace performance were boiling time, FCR, power input, power output, power loss and efficiency are boiling time, FCR, operating time, power input, power output, power loss and efficiency. Test of operating time were conducted by burning fuel until burned out. Then boiling time test were conducted by heated 1 liters water from ambient temperature to boiling (between 95oC - 97oC) on a 24 cm diameter pan.The results showed that the largest operating time (1317.33 Seconds), smallest FCR (2.249 Kg/hour), smallest power loss (19.532 kW), and the highest efficiency (8.19%) obtained at 0% : 100% combination. The fastest boiling time (157 Seconds) and the largest power output (1.828 kW) was obtained at 40%: 60% combination. While the largest power input (29.286 kW) was obtained at 60%: 40%.

Analisis penggunaan alat magnetisasi bahan bakar secara elektromagnetik terhadap unjuk kerja mesin empat langkah satu silinder

Mara, I.M., Joniarta, I.W., Alit, I.B., Sayoga, I.M.A., Nuarsa, I.M.

Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 8, No 2 (2018): Dinamika Teknik Mesin, 10 articles
Publisher : Universitas Mataram

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Abstract

The effort to increase fuel economy and to thrift the usage of fossil fuel is becoming main focus in the entire the world. One of those efforts is by using electromagnetic field in order to increase the quality of the combustion process and reducing fuel consumption.This research investigates the effect of the number of cooper wire winding on electromagnetic field on engine torque, engine power and fuel consumption of 100 cc four stroke single cylinder gasoline engine. The numbers of cooper wire windings are, 3000, 4000 and 4500. The engine performance was analyzed at several engine rotations. The result shows that there is an increase of engine power by 13% and on the other hand the fuel consumption reduced by 11% on 4000 windings at 6000 rpm.

Kekuatan mekanik komposit diperkuat serat alam selulosa

Sari, Nasmi Herlina

Dinamika Teknik Mesin Vol 8, No 2 (2018): Dinamika Teknik Mesin
Publisher : Universitas Mataram

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Abstract

This study aims to analyze the tensile strength of three different types of composites. Composites are made from polyester resins with different fibers; Pandannus Amariliofius fiber (PPW), Eichhornia Crassipes fiber (PCH) and Coconut Fronds fiber (PPK). The three composite types have a polyester and fiber resin composition that is 50:50, 60:40, 70:30, 80:20, and 90:10 (% volume). Manufacture of composite samples using a hot press technique. The results of this study indicate that the tensile strength and Izod impact strength from the coconut fronds fiber reinforced composite is better than the other composites studied, due to the incorporation of fibers in the polyester resin matrix. These results suggest that in terms of their mechanical properties, the performance of the composite properties reinforced by the cellulosic natural fibers can be a candidate to replace artificial wood products.

Pengaruh tebal kaca terhadap kinerja kolektor surya pelat datar dengan menggunakan absorber batu granit

Wirawan, M., Mirmanto, M., Pramudia, F., Adhi, I.G.A.K.C, Sutanto, R.

Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 8, No 2 (2018): Dinamika Teknik Mesin, 10 articles
Publisher : Universitas Mataram

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Abstract

This paper presents the experimental data of the use of granite stone as an absorber of the tested solar colecctor. The purpose of this study is to know the effect of the cover thickness of the collector. Three different thickness of the glass cover of the collector, i.e. 3 mm, 5 mm, and 8 mm, were tested. Three identical collectors were utilized in this current study, and the collectors were placed facing North. The dimension of the granite absorber is 100 cm x 80 cm x 10 cm and the arrangement of the pipes in the collector is parallel with 7 pipes. The water used to remove the heat from the absorber was flowed naturaly due to the gravity. The water volumetric flow rates employed were 300 cc/min, 400 cc/min and 500 cc/min which were measured using a glass volume meter and a stop watch. The research results show that energy come to the absorber (Qin), energy absorbed by the absorber (Quse), and the temperature of water increase with the time. All of them have a peak at around 12.00-14.00 Wita. The thicknes of the glass cover affect the performance of the collectors. The glass cover thickness of 5 mm results in the better performance than that of the two others. 

Simulasi tegangan pada pengaruh putaran roda terhadap speed bump menggunakan metode FEM

Hidayat, R., Haryono, M.B.

Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 8, No 2 (2018): Dinamika Teknik Mesin, 10 articles
Publisher : Universitas Mataram

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Abstract

The interaction between tires with road surface is very important because it can reduce the risk of accidents due to damage to the tire. This research was investigated the stress distribution as a result on pressure of tires rolling across speed bump. The research methode used solid work and abaqus application to simulation, the paramaters on research used variation on high speed bump (75mm, 120mm and 160mm) and tires speed (8, 20 and 30kmh). The result showed the higher load recived by tires, the higher stress produced The interaction between tires with road surface is very important because it can reduce the risk of accidents due to damage to the tire. This research was investigated the stress distribution as a result on pressure of tires rolling across speed bump. The research methode used solid work and abaqus application to simulation, the paramaters on research used variation on high speed bump (75mm, 120mm and 160mm) and tires speed (8, 20 and 30kmh). The result showed the higher load recived by tires, the higher stress produced 

Karakteristik fisik dan kimia bioetanol dari jagung (Zea mays L)

Tira, Hendry Sakke, Mara, Made, Zulfitri, Z., Mirmanto, M.

Dinamika Teknik Mesin Vol 8, No 2 (2018): Dinamika Teknik Mesin
Publisher : Universitas Mataram

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Abstract

The aim of this research is to know the physical characteristics and chemical contents of corn bioethanol (Zea Mays L.). The bioethanol is produced by distillation process through variations in fermentation duration. The bioethanol produced then was tested in order to measure the physical characteristics and sulphur content. The measured physical and chemical characteristics of bioethanol were density, kinematic viscosity, flash and fire point and sulphur content.The results showed that the physical characteristic value and sulphur content of the bioethanol had close values compared to those of the standart. They were found in fermentation with duration of 70 hours under second distillation process. However a further research is still be required to obtain a suitable characteristic for transpostation purpose. 

Sampul Dinamika Teknik Mesin Vol. 8, No.2

Dinamika Teknik Mesin, Dinamika

Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 8, No 2 (2018): Dinamika Teknik Mesin, 10 articles0
Publisher : Universitas Mataram

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Abstract

Sampul Dinamika Teknik Mesin Vol. 8, No.2

Variasi sudut pemasangan tabung kompresor terhadap unjuk kerja pompa hidram

Sutanto, R., Wardani, K., Alit, I.B., Wirawan, M.

Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 8, No 2 (2018): Dinamika Teknik Mesin, 10 articles
Publisher : Universitas Mataram

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Abstract

Water is one of the factors which very important and necessary in the life of living creatures. Therefore,  water  must  be  available  whenever  and  wherever  in  the  quantity,  timing,  and sufficient quality. Hydraulic Ram Pump (Hydram) is a pump which does not require external energy as the power source. The purposes of this research are understanding the influence of mounting tube compressor with tilt angle from the water weight-lift of output pipe .This  research  uses  hydrant  pump  by  the  specification of  tube  compressor where  its’ diameter 3 inches and a height of 60 cm. The falling angle of pump is 35°. The falling-height is 2 meter with 4 variations of weight-lift 4, 4½, and 5 meters.The method of analysis is conducted by analyzing data obtained during the experiment, where the   results in the form of quantitative data which is presented in type of   tables and displayed in graphical form. The results of the research shows that  the best output debit on mounting tube compressor variation 90° that is 0.035 l/s  with 4 meters water weight-lift, while the lowest output debit on mounting tube compressor variation that is 0.011 l/s 5 meters water weight-lift. The best efficiency is 27.3 % in the mounting tube compressor variation 90°  with 4 meters of water weight-lift, while the lowest efficiency is 6.5 % in the mounting tube compressor variation 90° with 5 meters of water weight-lift.

Pengaruh variasi komposisi arang kelapa dan kayu berpenguat serat ijuk terhadap sifat fisik dan mekanik komposit kampas rem

Salman, S., Triady, A.A.A., Rahman, M.A.

Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 8, No 2 (2018): Dinamika Teknik Mesin, 10 articles
Publisher : Universitas Mataram

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Abstract

The breaking system is a mechanical system to reduce the movement of the wheels. The existing nowadays friction material from asbestos belongs to cancer risk besides accelerating the damage of the brake drum. Therefore, the green friction material needs to be developed.The objective of this study is to determine the best composition of coconut shell of charcoal powder, wood powder, palm fibre and phenol resin as an alternative substitution of brake friction material. Variations in the percentage composition of coconut shell of charcoal powder were 45%, 40%, 35%, 30% and 25%. Sawdust and phenol resin were constant at 20% and 25% respectively, while the palm fibres were 10%, 15%, 20%, 25% and 30%. The specimens were produced by moulding under pressure 4 tons and heated at temperature 150o for 3 hours. The tests were wear, hardness, tensile test and micro photograph.The results showed that the lowest wear value is 1,68x10-6 gr/mm2.s and the highest one is 3,71x10-6 gr/mm2.s. The highest hardness value is 60,497 HBN and the lowest one is 54,329 HBN. While the maximum tensile stress is obtained at 9,50x10-1 MPa and the lowest one is 2,01x10-1 MPa. The best composition is obtained at the composition of 45% of coconut shell of charcoal powder, 20% of wood powder, 10% of palm fibre and 25% of resin phenol.