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<![CDATA[Position Optimization of SDVA Mass (1/20 System Mass) to Reduce Translation and Rotation Vibration on Beam ]]>
<![CDATA[Susastro Suharto]]>
<![CDATA[ Jurnal Teknik Mesin (JTM) Vol 7, No 1 (2017) ]]>
Publisher : <![CDATA[LP2M - Institut Teknologi Padang ]]>
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<![CDATA[In many cases, amount of SDVA mass (single dynamic vibration absorber) which is used to dampen vibrations is equal to 1/10 of the mass of the system. Meanwhile, the amount of additional mass is sometimes felt to be too great if the mass system is also great. To resolve this problem, we use mass absorber with a much smaller size. In this research, we did a simulation optimization of the use massa SDVA 1/20 on the beam, to damped translation and rotation vibration from main system. The study began by building a 2 DOF vibration prototype system with the addition of SDVA. Prototype modeled into mathematical equations and simulated to determine the change vibration characteristics. In this simulation we provide changes in the excitation frequency and distance of the center of mass SDVA future main system. From this research indicated that the addition of SDVA capable of reducing vibration direction of translation by 98.53% that occurred at a frequency ratio of 1. Whereas for rotational motion, vibration reduction which occurred amounted to 80.41%. From the results of This research also concluded that translation and rotation vibration reduction are best obtained when the ratio of the arms by rl = 0,9 with 75,84 % vibration reduction.]]>
<![CDATA[Optical Properties Degradation of Organolead Halide Perovskite with Lead Devired from Solder Wire ]]>
<![CDATA[Putri Pratiwi]]>
<![CDATA[ Jurnal Teknik Mesin (JTM) Vol 7, No 1 (2017) ]]>
Publisher : <![CDATA[LP2M - Institut Teknologi Padang ]]>
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<![CDATA[Organolead halide perovskite material was used as the most common light-harvesting active layer in perovskite solar cell. This material is the most promising material in photovoltaic technology due to its fastest-advancing power conversion efficiency (PCE) to date. The PCE has increased up to 22.1 % only six years after it was discovered in 2009. In our last research, we synthesized and fabricated perovskite solar cell using CH3NH3PbI(3-x)Clx material as light-harvesting active layer. We extract lead from solder wire to produce PbCl2 powder. This powder was used as basic substance for organolead halide perovskite material. CH3NH3PbI(3-x)Clx solution produced by reacting CH3NH3 with PbCl2 powder in DMF (Anhydrous N,N-Dhymethilformamide) by using solution based method. Based on device performance characterization, we conclude that solder wire is suitable enough for fabricating perovskite solar cell. They have identical characteristic compared to commercial lead. However, both perovskite solar cell using lead from solder wire and commercial lead’s performance are smaller than published solar cell’s efficiency. Therefore, in this study we investigate that degradation affected perovskite material performance, especially physical appearance and absorbance characteristic. ]]>
<![CDATA[Hardness Test on the Alloy Fe-50%atAl With the Addition of Nickel Using Mechanical Alloying Method ]]>
<![CDATA[Abrini, Dona]]>;
<![CDATA[Ardhy, Sanny]]>;
<![CDATA[Putra, Haznam]]>
<![CDATA[ Jurnal Teknik Mesin (JTM) Vol 7, No 1 (2017) ]]>
Publisher : <![CDATA[LP2M - Institut Teknologi Padang ]]>
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<![CDATA[Hardness test on the alloy Fe-50% at Al with the addition of nickel were prepared by mechanical alloying method. The powder mixture Fe-50at.%Al with the variation adding 0,5at.%Ni, and 2at.%Ni are grinded using High Energy Milling HEM E-3D in Argon condition for 10 hours. To determine the hardness, conducted to take the sample with the certain time duration to each composition. Then, the sample which has been taken is characterization using hardness. The results showed that the highest hardness properties exist in the alloy Fe-50% at Al-0.5% at Ni, amounting to 161.53 HV. The addition of nickel on alloy reduces the hardness properties of the alloy. However, the addition of nickel require a short time to raise the hardness properties.]]>
<![CDATA[Designing and Manufacturing of Meat Grinding and Meatball Dough Blending Machine ]]>
<![CDATA[Romiyadi Romiyadi]]>;
<![CDATA[Indah Purnama Putri]]>
<![CDATA[ Jurnal Teknik Mesin (JTM) Vol 7, No 1 (2017) ]]>
Publisher : <![CDATA[LP2M - Institut Teknologi Padang ]]>
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<![CDATA[The purpose of the study was to design and manufacture of meat grinding and meatball dough blending machine with a capacity of 6 kg. In this study, researchers add more functions on meat grinding to meatball dough blending machine. From the process of designing and manufacturing, has produced a meat grinding and meatball dough blending machine with a capacity of 6 kg for a process. The machine uses a electric motor with a power of 0.25 HP. Based on the test results, meat grinding and meatball dough blending machine was able to meat grinding and meat ball dough blending and has efficiency of 96 % for the meat grinding process and 95 % for the meatball dough blending process.]]>
<![CDATA[Effect of Particles Size on EFB Bio-briquettes of Calorific Value ]]>
<![CDATA[Nofriady Handra]]>;
<![CDATA[Anwar Kasim]]>;
<![CDATA[Gunawarman Gunawarman]]>;
<![CDATA[Santosa Santosa]]>
<![CDATA[ Jurnal Teknik Mesin (JTM) Vol 7, No 1 (2017) ]]>
Publisher : <![CDATA[LP2M - Institut Teknologi Padang ]]>
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<![CDATA[The development of biomass has been assumed as an important issue in the past several decades and would remain to be attractive in the future due to its clean, renewable, and carbon–neutral properties. Biomass is one of the most important renewable energy resources in the world. In recent decades, the utilization of biomass has dramatically increased. The objective of this research was to knowing effect of particles size on EFB bio-briquettes of calorific value. There were many reasons. First, biomass is a renewable resource, because of the availability of biomass is unlimited, and its regenerative process runs well. Second, the extraction of biomass energy can be carried out more flexibly. The biomass can be burned directly without high technology. Biomass bio-briquettes are often used as an energy source for cooking purpose and in some industries. The 2% (dry basis) is used as a binder in a mixture with EFB fibre. Samples of solid cylindrical shape Ø 4 cm and 6 cm high and density sample is 0.8 gr/cm2. The pressure is used to generate samples specified in the mold volume. The volume of the cylinder is 75.36 cm2. The particle size briquette of 40 mesh average water content of 9.1% was generated while the size of 60 mesh was 9.5%. The particle size of 60 mesh (smooth) yields the highest value between 20 mesh and 40 mesh. The value of ash content generated by 4.35% is higher than the size of 20 mesh (2.88%) and 40 mesh (3.09%). On the particle size of 20 mesh fibers (more roughly), it yields a calorific value of 4237.5 kal /gr and is higher than 40 mesh fiber particle size (4102.2 kal/gr) and 60 mesh (4066.5 kal/gr). The difference in heating value produced by the three did not show any significant difference.]]>
<![CDATA[AFR Modeling of EFI Engine Based on Engine Dynamics, Vehicle Dynamics, and Transmission System ]]>
<![CDATA[Suroto Munahar]]>;
<![CDATA[Muji Setiyo]]>
<![CDATA[ Jurnal Teknik Mesin (JTM) Vol 7, No 1 (2017) ]]>
Publisher : <![CDATA[LP2M - Institut Teknologi Padang ]]>
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<![CDATA[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. ]]>
<![CDATA[Numerical Analysis of Aeration Flow by Using Finite Differences Method on The Substances Heap Model in Storage ]]>
<![CDATA[Yanto, Asmara]]>
<![CDATA[ Jurnal Teknik Mesin (JTM) Vol 7, No 1 (2017) ]]>
Publisher : <![CDATA[ITP Press - Institut Teknologi Padang ]]>
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<![CDATA[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.]]>
<![CDATA[Modeling and Simulation of a Rotary Quadruple Pendulum System Using Scientific Python Stacks and Modelica Language ]]>
<![CDATA[Adriyan Adriyan]]>
<![CDATA[ Jurnal Teknik Mesin (JTM) Vol 7, No 1 (2017) ]]>
Publisher : <![CDATA[LP2M - Institut Teknologi Padang ]]>
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<![CDATA[This paper presented the modeling and simulation of a rotary quadruple pendulum (RQP) system using two open source software, i.e: scientific python stacks (SciPy stacks) and Modelica language via Anaconda python distribution and OpenModelica, respectively. The modeling stage using SymPy (a package of SciPy stacks) was conducted to obtain the governing equation in full symbolic form by applying Lagrange’s method. The listing code is also provided to test by the user later on. Meanwhile, both modeling and simulation were performed in Modelica language by addressing several conditions concerning the initial conditions of the system, i.e: examining up-up-up-up, up-up-down-down, and up-down-up-down conditions. Simulation required the numerical values of the RQP system be supplied before running the simulation. In conclusion, the derivation of the governing equation using SymPy can be done in a matter of minutes without having a mistake when doing the algebraic manipulation. Simulation using OpenModelica was present the response of the RQP system in three conditions that considered initial conditions imposed to the system. The model obtained through this research can be used a baseline for developing a control scheme for the RQP system in its inverted position.]]>
<![CDATA[Design of PID Control System for Liquid Surface Height Using Root Locus Method ]]>
<![CDATA[Iskandar Azis]]>
<![CDATA[ Jurnal Teknik Mesin (JTM) Vol 7, No 1 (2017) ]]>
Publisher : <![CDATA[LP2M - Institut Teknologi Padang ]]>
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<![CDATA[Control of the liquid surface height at a plant requires a system of control. The design of the control system requires a method of completion for height control system capable of controlling the liquid level remains stable at the desired level, namely the level of 8 and 10. The purpose of this research is to design a control system on a high surface of the liquid with PID control and implement methods of Root Locus. In this study, the liquid surface height of plant to be controlled ie MISO plant with two tanks. Root locus method has been able to control the high liquid level in the tank 1 with PID control parameters Kp = 58.27, Kd = 0.5. While high liquid level in the tank 2, PID control parameters are Kp = 75.7, Kd = 5. High surface of the liquid in the know stabilized by providing high varisi disruption of the liquid surface is high melibihi SP and under high-SP into PID control system.]]>
