JOURNAL OF SCIENCE AND APPLIED ENGINEERING
Published by Universitas Widyagama
ournal of Science and Applied Engineering (JSAE) is an open access peer-review journal, and is aimed to disseminate original research in all fields of Electrical Engineering, Mechanical Engineering, Civil Engineering, Industrial Engineering and Informatics Engineering and presents the latest development and achievements in scientific research in Indonesia and overseas to the world’s community. Only original, innovative and novel papers will be considered for publication in the JSAE. The authors are required to confirm that their paper has not been submitted to any other journal in English or any other language. The JSAE welcome contributions from all who wishes to report on new developments and latest findings in science and applied engineering.
Articles
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Articles
Utilization of Palm Fiber King as a Strengthening Material on Biocomposite

Pohan, Gerald A, Sugiarto, Totok, Arianto, Dwi Cahyo Galih

JOURNAL OF SCIENCE AND APPLIED ENGINEERING Vol 1, No 1 (2018): JSAE
Publisher : University Of Widyagama Malang

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Abstract

Royal palm (Roystonea regia) is still utilized in traditional way. In this study, royal palm fiber is employed as a reinforcing material in composites. The fiber is divided into two groups of fibers, which are continuous and discontinuous, with a length of fibers of 20 and 5 cm, respectively. Continuous fibers are arranged in parallel, while discontinuous fibers are sown in random orientation. The variations in fiber volume fraction were 15, 25, 50, and 75%. Tensile tests were performed to determine composite strength. The test results show that composite tensile strength values with continuous fibers are higher than those of discontinuous fibers. In addition, the increase in fiber volume fraction is directly proportional to the tensile strength of the specimen. These results indicate that the royal palm fiber has the potential to be used in composite applications.Keywords: royal palm fiber, biocomposite, tensile strength

PLANNING OF HUMAN RESOURCE COMPETENCY DEVELOPMENT IN PT.XYZ WITH TAGUCHI METHOD

K, Mariza, Basuki, Diah Wilis Lestarining

JOURNAL OF SCIENCE AND APPLIED ENGINEERING Vol 1, No 1 (2018): JSAE
Publisher : University Of Widyagama Malang

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Abstract

The problem of human resources is still a concern within the company to remain competitive in this globalization world. This shows that the problem of human resources greatly affect the implementation and success of the company in achieving goals and objectives. The company demand to obtain the development process and get quality human resources more urgent. And the development of human resource competence is necessary. This study uses experimental testing with several parameters of validity and reliability testing. For testing analysis using Taguchi Method. Based on the Response Table for Signal to Noise Ratios Nominal is best obtained taguchi test results obtained values obtained from the effect plot for means with the approach of table of means, then the intellectual competence is needed for the improvement of HR performance. Keywords: HR, Competence, Taguchi Method

USE OF ZEOLITE IS ACTIVATED AS SUBSTITUTION OF CEMENT FOR PRICE AND COST

Alwi, Ahmad Nurfiki, Setiaji, Arif Rahman, Agung, Abdurrohim Kurnia, Halim, Abdul

JOURNAL OF SCIENCE AND APPLIED ENGINEERING Vol 1, No 1 (2018): JSAE
Publisher : University Of Widyagama Malang

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Abstract

The number of economic needs is one of the fundamental aspects to support the survival of every individual in an area.  If seen in general, the cost of building the building and residential community still use building materials and installation costs are relatively higher.  With the advancement of technology has found a lightweight brick that has better strength, lighter, faster installation and environmentally friendly, so many people began to switch to using lightweight bricks.  For now the price of lightweight brick is still expensive, but this deficiency is covered with the speed of mounting and light weight so overall lightweight brick usage on certain patterns is very profitable.  The use of cement on lightweight bricks leads to high production costs.  With the above problems we have a breakthrough to replace the cement by using zeozolites containing silica compounds that resemble one of the cement compounds.  In this research, cement replacement with Zeolite is 20%, 40% and 60%.  Before use Zeolite was first activated using Fly Ash ratio of 65% Zeolite: 35% Fly Ash and 50% Zeolite: 50% Fly Ash, also activated using Ca (OH) 2 ratio 65% Zeolite: 35% Ca (OH) 2  And 50% Zeolite: 50% Ca (OH) 2.  Thus, there are 15 compositions including the control composition, each composition will be made up of 10 specimens.  Hypothesis testing using two way anova, tested is the effect of cement change treatment with Zeolite and comparison of Zeolite composition with Fly Ash and Ca (OH) 2 to compressive strength, absorption and cost. Keywords: Zeolite, Cement, compressive strength, Cost

VIBRATION SIGNAL ANALYSIS FOR CAVE DETECTION AS BASIC OF DEVELOPING PUMP OPERATIONS: CASE STUDY UNIT DISTILLATION PLN BELAWAN

Lubis, Muhammad Zukhri, Isranuri, Ikhwansyah

JOURNAL OF SCIENCE AND APPLIED ENGINEERING Vol 1, No 1 (2018): JSAE
Publisher : University Of Widyagama Malang

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Abstract

Cavitation occurs due to the formation of empty cavities in the fluid flow that decreases pressure quickly. When cavitation occurs then the pump performance will decrease marked with noise and when this condition is not addressed will cause damage to the pump components. The distillation pump working under vacuum pressure and working temperature at 38 ° C is susceptible to cavitation. The pressure and temperature conditions of this distillation pump work result in faster fluid evaporation and eventually trigger cavitation. To avoid the occurrence of cavitation, it must be known operational limits concerning the pressure and working capacity of the distillation pump. The operational limit of this pump is between the shut-off point meaning there is no flow and run-out point which means the full capacity of the pump. This study aims to determine the operating limits of safe distillation pumps both from pressure and capacity. The experimental methodology used is to vary the capacity of the pump by adjusting the opening valve discharge at 100%, 90%, 80% and 70% capacities. Then for each capacity varied also the suction pressure of pump at 0 mmHg, -7 mmHg, -15 mmHg and -22 mmHg by arranging vacuum pump. The magnitude of the vibration response is measured to determine the effect of the capacity and variation of pump suction pressure. With this method can be known range of capacity and pressure suction safe for operation of distillation pump. The results showed that the highest vibration value was in the axial direction. Vibration spectrum value spread over the range 1600 - 1900 Hz with the highest value is at 100% capacity (0.00278 m3 / sec) suction pressure -0 mmHg with amplitude of 0.410 g at 1660 Hz frequency. While the lowest vibration value is at a flow rate of 0.00208 m3 / sec with an amplitude of 0.210 g at a frequency of 1816 Hz. While the minimum flow rate to avoid the occurrence of cavitation due to recirculation flow is equal to 0.00172 m3 / sec. Keywords: cavitation, distillation pump, operational limit, valve discharge, vacuum pump

ANALYSIS OF BIODIVERSITY AND QUALITY OF METRO RIVER IN MALANG CITY (PLANKTON AND BENTOS BIOINDICATOR STUDY)

Setyobudiarso, Hery, yuwono, Endro

JOURNAL OF SCIENCE AND APPLIED ENGINEERING Vol 1, No 1 (2018): JSAE
Publisher : University Of Widyagama Malang

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Abstract

Metro River is a river that passes through Malang City and empties into Karangkates Dam. The increasing number of residents of Malang City resulted in more volume of waste water produced, and one of them is dumped on the Metro River. This affects the increasing pollution load received by the river so that it affects the decreasing of tamping capacity of river pollution load. Changes in water quality in rivers lead to changes in macrozoobenthic community composition. Therefore, it is necessary to monitor the quality status of Metro River by using macrozoobentos animals. The purpose of this research is to make the classification of Metro River based on macrozoobentos animal community in determining the water quality status of Metro River based on macrozoobentos and the classification of pollution level that happened. The research method is field observation, water quality measurement of Metro river and macrozoobentos sampling. The results showed that the distribution of macroinvetebrata in the Site of group of Banana Temple was from Gastropoda family, Leptophlebiidae, Chloroperliidae, and Baetidae on rocks with fast current velocity (1.02 m3 / s), 17-27 ° C, BOD level 3.7 mg / l, and COD content of 20.8 mg / l. While on the Site of group Merjosari, Karang Besuki, Bandulan and Sitirejo were found macrozoobentos from Chironomidae, Hydrop sychidae and Lumbri cullidae families, on the substrate of mud and sand, with slow flow rate (0.0052 - 0.0675 m3 / s), BOD 21, 8 - 45.7 mg / l, and COD content 107.8 -267.2 mg / l. The status of upper Brantas river waters determined by using the BMWP Index of the Pisang Candi, Merjosari, Karang Besuki, Bandulan and Sitirejo groups has medium gray water status with ASPT values ranging from 4 to 6.2.  Keywords: macrozoobentos, Water Quality Status of River, BOD, COD

UTILIZATION OF CORK COCOPEAT AS A COMPOSITE SILENCER

Setyawan, Eko Yohanes, Sugiarto, Totok, Djiwo, Soeparno

JOURNAL OF SCIENCE AND APPLIED ENGINEERING Vol 1, No 1 (2018): JSAE
Publisher : University Of Widyagama Malang

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Abstract

Noise is unwanted sound of activity in a particular time and levels that can cause health problems and environmental comfort. Sound or sound is heard as the stimulation on the auditory nerve cells in the ear by a wave of longitudional caused the vibration of the sound or sound source and the waves propagate through the medium of air or any other conductor. Threshold noise received by normal human beings that is 85 dB, when the normal threshold above can lead to damage to the auditory system when not using protective tools in conducting activities. The noise can be avoided by way of designing construction work. In addition noise can be minimised with soundproofing materials. During this suppressor used i.e. from rubber, plastic and metal, but the materials used nowadays are not yet are biodegradable. Therefore, to minimize noise with materials that are biodegradable with composite materials. One effort in selecting materials that are biodegradable with coconut plant utilization have been known by the wider community wastes a lot of cocopeat i.e. we encounter in a craftsmen coir because its existence is underutilized by craftsmen. Natural fibers are biodegradable they have opportunities to be developed further into a composite reinforcement materials that have high performance as an alternative replacement of artificial fiber materials based compounds, hydrocarbons or metal.Methods used i.e. experimental methods, with chemical treatment of cocopeat aims to separate dirt and the lignin contained in the cocopeat so cocopeat can bind matrix that would have a high performance in the muffle the sound so that it can reduce noise. After treatment with alkali, creating a noise test specimens in accordance with the design of the mold. Then the noise testing was performed using a sound pressure level to know the ability of mute and SEM photographs to find causal in a composite able to absorb sound.The results showed, the percentage composition of the powder of coconut fibres (cocopeat) have an influence in absorbing sound. In this study the composition of the powder of coconut fibres (cocopeat) 60% has a high sound absorbency. Desible votes after going through the composite powder coconut fibres 60% has a value of 102.73 db at a distance of 50 cm, 100 db at a distance of 91.57 cm and 80.23 db at a distance of 150 cm. And sound absorbency coefficient on the composition of the powder of coconut fibres 60% has a value of 0.144 on a distance of 50 cm, 100 cm at a distance of 0.237 and 0.331 approximately 150 cm. Whereas in terms of surface morphology of SEM photo of that on the composition of the powder 60% coconut fibers have more porosity percentage which has absorption ability voice more effectively so that the sound after passing the composition of composite lower. Keywords: noise, Biodegradable Composite, cocopeat, SEM.

ANALYSIS OF CONDENSER PERFORMANCE DESALINATION OF SOLAR ENERGY OF THE NATURAL VACUUM SYSTEM AT THE TIME OF LOW RADIATION INTENSITY

Ambarita, Himsar, Setiawan, Eko Yohanes

JOURNAL OF SCIENCE AND APPLIED ENGINEERING Vol 1, No 1 (2018): JSAE
Publisher : University Of Widyagama Malang

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Abstract

Natural desalination device solar vacuum system has a main component of evaporator, condenser, and solar collector. The production of clean water from this appliance is strongly influenced by the performance of the condenser.On this research, condenser performance is performed when the intensity of solar radiation is low. The measurement data for 2 days when the sky is not bright is used to perform the condenser performance analysis. The result of analysis on the first day was found that the working energy of condensorsirippada was 141 J / day, while if without 29 J / day fins. So that the effectiveness of fins of 112 J / day. While on the second day found heat transfer using 122 J / day fins without fins 25 J / day to obtain fin effectiveness of 97 J / day. This is very influential on clean water production. The condensate rate on the 1st day is highest at 0.00018 kg / min, with an average of one day experiment 0.0001 kg / min, yielding fresh water of 0.8 Liter. On the 2nd day the highest condensate rate is 0.00019 kg / min with an average of condensate rate for one day 0.00011 kg / min, yielding fresh water of 0.81 Liter.

ANALYSIS TOOL OVERHANG IN THE MACHINE CNC ET-242 ON SURFACE ROUGHNESS WITH VARIATION OF FEEDING

Rahmadianto, Febi, Hermawan, Dadang

JOURNAL OF SCIENCE AND APPLIED ENGINEERING Vol 1, No 1 (2018): JSAE
Publisher : University Of Widyagama Malang

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Abstract

Lathe is a process to get the shape of the cylindrical workpiece by rotating the workpiece on the spindle and moving the chisel towards the workpiece. To be able to screw the workpiece of the chisel should hang and extend from the turret. The length of the hanging chisel is called the tool overhang (Zelinski, 2005: 1). There is no definite hint of setting the tool overhang and only adjusted between the position of the turret and workpiece. In order to achieve a good surface roughness, usually the overhang tool is arranged to a minimum.In this study the independent variables used are the tool overhang 14 mm, 21 mm, 28 mm, 35mm and feeding 0.15 mm rotation-1, 0.25 mm rotation -1, 0.35 mm. rotation -1. The measured dependent variable is the surface roughness of the workpiece.From the results of testing and data analysis can be concluded that the tool overhang effect on the roughness of the workpiece surface results of the process of lathe in various variations of feeding (feeding). The longer the tool overhang and the greater the feeding motion will result in greater surface roughness. The lowest surface roughness was obtained from a 14 mm long overhang tool and feeding 0.15 mm rotation-1.Keywords :  Machine CNC ET-242, Surface Roughness, Feeding Variation.