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<![CDATA[Studi Boundary Element Method dan Multi-objective Inverse Analysis untuk Simulasi Deteksi Multikorosi Beton Bertulang ]]>
<![CDATA[M. Abrar Masykuri]]>;
<![CDATA[M. Ihsan]]>;
<![CDATA[S. Fonna]]>;
<![CDATA[S. Huzni]]>;
<![CDATA[Herdi Susanto]]>
<![CDATA[ Jurnal Mekanova: Mekanikal, Inovasi dan Teknologi Vol 6, No 2 (2020): Oktober ]]>
Publisher : <![CDATA[universitas teuku umar ]]>
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DOI: 10.35308/jmkn.v6i2.2760
<![CDATA[AbstractNowadays, corrosion probem become one of the important problem for infrastructures over the world. Therefore, over the last decades, several corrosion reearch has been investigated. Several software have been developed to simulate corrosion that occurs on the reinforcing steel in concrete. The fundamental goal of the simulation is to predict the degree of corrosion that achieved. Many pioneering works allowed for the successful application of the boundary element method (BEM) to simulate the corrosion. This research aims to study the ability of Boundary Element Inverse Analysis (BEIA) in detecting corrosion that more than one location or known as Multi corrosion on the reinforcing steel in concrete. BEIA is a method that developed to detect corrosion in reinforced concrete. BEIA developed by combining the application of Boundary Element Method (BEM) and Multi-objective Particle Swarm Optimization (PSO). BEM used to calculate potential values on concrete surfaces. Furthermore, PSO is used to evaluate the cost function to detect corrosion on reinforcing steel inside concrete. To execute BEIA, it requires several input parameters include the results of meshing and potential data from the field. However, in this case, the field potential data used is the result of the calculation of BEM simulation with a mesh size of 4mm and assuming the location of corrosion is at X1 = 50 mm and X2 = 350 mm. The simulation results from BEIA show that the position of the particles at the 150th iteration is already at the specified location, at X1 = 50 mm and X2 = 350 mm, this proves that Multi-objective BEIA can simulate multi corrosion detection that occur on a concreted surface.. Keywords—Multi corrosion, BEM, Multi-objective, BEIA, corrosion detection, reinforced concrete]]>
<![CDATA[KAJI KARAKTERISTIK PERPINDAHAN PANAS PENGARUH BELOKAN TAJAM PADA PENUKAR KALOR TIPE TUBE ]]>
<![CDATA[Zulfan Zulfan]]>;
<![CDATA[Ahmad Syuhada]]>;
<![CDATA[Zahrul Fuadi]]>;
<![CDATA[Al Munawir]]>
<![CDATA[ Jurnal Mekanova: Mekanikal, Inovasi dan Teknologi Vol 6, No 2 (2020): Oktober ]]>
Publisher : <![CDATA[universitas teuku umar ]]>
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DOI: 10.35308/jmkn.v6i2.2755
<![CDATA[Using the thermal machines in the production process or overdone heat power operation require unit of Heat Exchanger (HE) having high level heat transfer coefficient (hc) for transferring to the thermal reservoir. Experimental studies have been done for heat transfer characteristics of forced convection on the round duct with method use that compare three of heat exchanger with a variety of pipe bends and a long pass after a turn that is different. HE pipes have length of tube 500 mm with a 12 bends, HE pipes length of tube 250 mm with 24 bends and HE pipes length of tube 125 mm with 48 bends. The heat fluid flowed into the tube, and the tube is immersed in the cold water tank. For each of test equipments can be done three times experiment with different variations in inlet temperature that is at 600C, 700C and 800C, with a duration of 5 minute intervals for 50 minutes. Many pipe bends and short passes after a HE will increase turbulence flow pattern. The high of turbulence will increase the value of heat transfer coefficient, but it can hold on fluid flow rate. Keywords : heat transfer characteristics, round duct, sharp bends, long pass]]>
<![CDATA[Efisiensi Model Mesh Kasus Deteksi Simulasi Korosi Beton Bertulang Menggunakan Metode Axisymmetric Mesh Problem ]]>
<![CDATA[Muhammad Ihsan]]>;
<![CDATA[Herdi Susanto]]>
<![CDATA[ Jurnal Mekanova: Mekanikal, Inovasi dan Teknologi Vol 6, No 2 (2020): Oktober ]]>
Publisher : <![CDATA[universitas teuku umar ]]>
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DOI: 10.35308/jmkn.v6i2.2822
<![CDATA[In this study, a computational numerical modelling for corrosion simulation in reinforcing steel is developed. The corrosion simulation using Boundary element Method (BEM) and focusing for cylindrical reinforced concrete (RC). The main problem is high performance computer was required for the reinforced concrete corrosion simulation. Therefore, main purpose of this study is to reduce the needs of high-performance computer during the corrosion simulation. For the purpose, axisymmetric computational problem was integrated to the numerical BEM that considered able to reduce the computational effort. On the analysis process, the whole axial RC structures column was modeled by Laplace equation. The boundary condition for the corroded and non-corroded areas on the reinforcing steel (rebar) were represented by their established polarization curve. The Laplace equation was solved by BEM, thereby the potential on the structure can be analyzed. The simulation results show the similar potential distribution between BEM computational modelling by triangle element mesh and improvement BEM using axisymmetric element mesh problem. The simulation shows a significant differences, thereby the corrosion simulation using axisymmetric element mesh problem significantly reduces the computer effort in term of time-consuming and computer effort for the simulation. Thus, the improvement of the axisymmetric modelling for BEM becomes a powerful method for reducing the computational effort in term of cylindrical reinforcing steel corrosion simulation. Keywords— corrosion modelling, axisymmetric, BEM, cylindrical column, reinforced concrete]]>
<![CDATA[Tingkat Laju Korosi Atmosferik Baja Konstruksi di Lingkungan Pabrik Kelapa Sawit ]]>
<![CDATA[Herdi Susanto]]>;
<![CDATA[Joli Supardi]]>;
<![CDATA[Sulaiman Ali]]>
<![CDATA[ Jurnal Mekanova: Mekanikal, Inovasi dan Teknologi Vol 6, No 2 (2020): Oktober ]]>
Publisher : <![CDATA[universitas teuku umar ]]>
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DOI: 10.35308/jmkn.v6i2.2756
<![CDATA[ Environmental pollution that can cause atmospheric corrosion is the exhaust gas (exhaust fumes) generated from operating the palm oil industry. This atmospheric corrosion will reduce the volume and material mass of a machine component, so that if it reaches certain conditions the strength of the material will result in failure of industrial machine components. The corrosion rate of the construction steel can be measured using the weight loss method according to the ASTM G-50 standard and the ASTM G-1 standard. The research was conducted for one year and data collection was taken every month, the research location was at PT Agro Sinergi Nusantara Batee Puteh. The results of the study, the highest corrosion rate occurred in strip steel reaching 0.57 mpy in October and the lowest corrosion rate occurred for angled steel in September and cylindrical steel in May with a corrosion rate of 0.06 mpy. Keywords— atmospheric corrosion, palm oil industry, ASTM G-50, ASTM G-1, corrosion rate]]>
<![CDATA[Analisa Laju Korosi Pada Plat Baja ASME SA-283 Pada Daerah Splash Zone ]]>
<![CDATA[Reza Putra]]>;
<![CDATA[Muhammad Muhammad]]>;
<![CDATA[Abdul Rahman]]>;
<![CDATA[M. Rifai Adithia]]>
<![CDATA[ Jurnal Mekanova: Mekanikal, Inovasi dan Teknologi Vol 6, No 2 (2020): Oktober ]]>
Publisher : <![CDATA[universitas teuku umar ]]>
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DOI: 10.35308/jmkn.v6i2.2960
<![CDATA[Research on the corrosion rate of ASME SA-283 alloy steel has been carried out in the coastal environment. Corrosion is a decrease in the quality of the material that occurs due to the environment, where the coast is a splash zone area which is rich in salt content as a trigger for corrosion. Alloy steel is a material that is used widely as part of the construction of dock buildings on the coast The study was carried out by giving coating defects to ASME SA-283 material and varying the salinity in the splash zone area, where the coating thickness ranged from 350 μm - 410 μm and salt splash testing was carried out for 15 days. The results of the salt splash test show the types of corrosion that occur, namely pitting corrosion and unifrom corrosion. The largest corrosion rate occurred in the area that experienced a coating defect of 1,705 mm / year. The effect of coating on the corrosion rate is very large and the effect of coating defects on corrosion growth is quite high because the coating that functions as a protective specimen has been lost. The aim of this study are expected to become a reference for coating protection data in preventing corrosion growth in coastal environments. Keywords— Coating Defects, Corrosion Rate, Splash zone, Salinity.]]>
<![CDATA[Pengukuran Sound Pressure Level (SPL) dalam kabin mobil dengan menggunakan SEA Model ]]>
<![CDATA[Al Munawir]]>;
<![CDATA[Murhaban Murhaban]]>;
<![CDATA[Zulfan Zulfan]]>
<![CDATA[ Jurnal Mekanova: Mekanikal, Inovasi dan Teknologi Vol 6, No 2 (2020): Oktober ]]>
Publisher : <![CDATA[universitas teuku umar ]]>
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DOI: 10.35308/jmkn.v6i2.2758
<![CDATA[Statistical energy analysis (SEA) is a well-known method to analyze the flow of acoustic and vibration energy in a complex structure. For an acoustic space where significant absorptive materials are present, direct field component from the sound source dominates the total sound field rather than a reverberant field, where the latter becomes the basis in constructing the conventional SEA model. Such environment can be found in a car interior and thus a corrected SEA model is proposed here to counter this situation. The model is developed by eliminating the direct field component from the total sound field and only the power after the first reflection is considered. A test car cabin was divided into two subsystems and by using a loudspeaker as a sound source, the power injection method in SEA was employed to obtain the corrected coupling loss factor and the damping loss factor from the corrected SEA model. These parameters were then used to predict the sound pressure level in the interior cabin using the injected input power from the engine. The results show satisfactory agreement with the directly measured SPL.Keywords : Statictical Energy Analysis (SEA), Sound Pressure level (SPL), DLF and CLF]]>
<![CDATA[Usulan Perancangan Mesin Alcon Pada Dinas Kehutanan Jakarta Selatan Dengan Metode Reba ]]>
<![CDATA[Murwan Widyantoro]]>;
<![CDATA[Yuri Delano Regent Montororing]]>;
<![CDATA[Herri Darsan]]>
<![CDATA[ Jurnal Mekanova: Mekanikal, Inovasi dan Teknologi Vol 6, No 2 (2020): Oktober ]]>
Publisher : <![CDATA[universitas teuku umar ]]>
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DOI: 10.35308/jmkn.v6i2.2965
<![CDATA[This study aims to calculate the risk value for complaints experienced by workers at the Jakarta City Park Service when moving the Alcon machine by calculating the REBA value and getting the results of A score A score is 10, a B score is 8 then the C score is 9 with a Mean Risk Level. Height and immediately required speciication action for designing erginomic aids, namely TSB (Height of Elbow Standing and JT (Hand Reach) with the TSB dimension results from the percentile results, namely 104.65 cm used as a height measurement of the Alcon Machine push table and the results of the JT dimensions from the percentile results namely 85.01 cm which is used to measure the width of the Alcon Machine push table.Keywords - Work Posture, REBA, Anthropometry, Facility Design]]>
<![CDATA[Laju Korosi Atmosferik Baja Konstruksi di Area Pabrik PT. Karya Tanah Subur ]]>
<![CDATA[Joli Supardi]]>;
<![CDATA[Herdi Susanto]]>
<![CDATA[ Jurnal Mekanova: Mekanikal, Inovasi dan Teknologi Vol 6, No 2 (2020): Oktober ]]>
Publisher : <![CDATA[universitas teuku umar ]]>
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DOI: 10.35308/jmkn.v6i2.2759
<![CDATA[ Abstract Environmental pollution that can cause atmospheric corrosion is the exhaust gas (exhaust fumes) generated from operating the palm oil industry. This atmospheric corrosion will reduce the volume and material mass of a machine component, so that if it reaches certain conditions the strength of the material will result in failure of industrial machine components. The corrosion rate of the construction steel can be measured using the weight loss method according to the ASTM G-50 standard and the ASTM G-1 standard. The research was conducted for one year and data collection was taken every month, the research location was at PT Agro Sinergi Nusantara Batee Puteh. The results of the study, the highest corrosion rate occurred in strip steel reaching 0.57 mpy in October and the lowest corrosion rate occurred for angled steel in September and cylindrical steel in May with a corrosion rate of 0.06 mpy. Keywords— atmospheric corrosion, ASTM G-50, ASTM G-1, PT. KTS]]>
<![CDATA[Perancangan Touchless Hand Washer Sistem Pijakan Kaki untuk Pencegahan Penyebaran COVID-19 ]]>
<![CDATA[Sulaiman Ali]]>;
<![CDATA[Syurkarni Ali]]>;
<![CDATA[Herdi Susanto]]>;
<![CDATA[Rita Hartati]]>;
<![CDATA[Zahir Raditya]]>
<![CDATA[ Jurnal Mekanova: Mekanikal, Inovasi dan Teknologi Vol 6, No 2 (2020): Oktober ]]>
Publisher : <![CDATA[universitas teuku umar ]]>
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DOI: 10.35308/jmkn.v6i2.3075
<![CDATA[The spread of the Coronavirus Disease (COVID-19) outbreak in all parts of the world is increasing, including in Indonesia, a virus that is easily transmitted and spreads through close contact and droplets by touching hands with other people or with objects that have been exposed to COVID-19, one of the reasons for this, reventing the spread of COVID 19 by washing hands frequently with soap. Hand washing tools have been developed, generally still using direct touch to the water tap and soap dish, the Touchless Hand Washer (THW) touchless hand washing tool is specially designed and manufactured in accordance with the COVID-19 pandemic conditions without touching with hands directly on the water tap and a soap holder with a footrest system, making it more practical, hygienic and not directly contaminated with previous Touchless Hand Washer users which could cause COVID-19 transmission from previous users. Touchless Hand Washer (THW) is designed with a pyramid-shaped frame that will support the water toren that does not harm or the water toren falls for Touchless Hand Washe users, with a THW tool height of 120 cm, top width 70 x 70 cm and bottom width of 90 x 90 cm. Keywords—Hand-washing tool, COVID-19, washing hands, touchless hand washer ]]>
<![CDATA[Modifikasi Blender Dapur Menjadi Blender Santan Rumahan ]]>
<![CDATA[Zakir Husin]]>;
<![CDATA[Herdi Susanto]]>;
<![CDATA[Masykur Masykur]]>;
<![CDATA[Nasri Agus Saputra]]>
<![CDATA[ Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi Vol 6, No 2 (2020): Oktober ]]>
Publisher : <![CDATA[universitas teuku umar ]]>
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DOI: 10.35308/jmkn.v6i2.7161
<![CDATA[Nowadays, there are many tools for processing coconut milk, such as grater machines, hydraulic coconut squeezing machines and others, but they are large in size and less efficient for daily use. The purpose of this research is to redesign an ordinary blender to become a coconut milk production blender and to manufacture an ordinary blender to become a coconut milk production blender and to do the testing. The designs that are carried out are the components of the blender mechanism, the grate, and the inner tube. Modifying an ordinary blender into a coconut milk blender by adding an inner tube and drawing it with AutoCAD 2007. After testing the grated and squeezed coconut blender it went well with the grated yield obtained of 1.15 kg from 5 coconuts and the yield of coconut milk obtained during the test was 1.66 liters from 5 coconuts.]]>
