Journal of Evrímata: Engineering and Physics

The Simulation Strength Analysis on PVC Pipe Blade Propeller Horizontal Axis Wind Turbine with Tip Elbow

Aji Tisa Prayudha, Bagus Wahyudi — Thu, 16 May 2024 00:00:00 +0700

Generally, The basic problem of wind energy technology is how to design wind turbines from materials that are easily available in the market, one of the solutions is PVC pipe as a blade material. This material is easily search at building shop . but, it is necessary to analyze the working stress that occurs in PVC blade construction, so that the PVC pipe propeller wind turbine is safe and durrable when applied in the community. The purpose of this study is to determine the effect of wind speed and tip elbow width on working stress. The simulation test method uses Ansys Flow Simulation Software and then the results are exported to Static Simulation to determine the strength of the material. Simulation tests were carried out with wind loads on PVC pipe propellers with wind speeds of 5 m/s, 6 m/s, and 7 m/s and elbow tip widths 100 mm, 110 mm, and 130 mm.

the Buck-boost converter in photovoltaics for battery chargers

Mon, 27 May 2024 00:00:00 +0700

Alternative energy is energy that is widely developed by scientists nowadays, especially in terms of electricity. Currently, the alternative energies that are widely developed are wind power, hydropower, geothermal energy, and solar power. Solar power is a promising energy source in Indonesia. The utilization of solar energy requires photovoltaics to convert solar energy into electricity, while for charging a12V/7Ah battery, a buck-boost converter is used. However, the use of the buck-boost converter still has some shortcomings, such as reversed voltage polarity. To address this issue, it is proposed to use a2-switch buck-boost converter. With the2-switch buck-boost converter, it is capable of charging the battery with an initial voltage of19V, which is then reduced to14.25V to charge the battery with an initial voltage of10.08V to11.16V within60 minutes, maintaining the same polarity as the initial input and with a maximum current from the photovoltaic of3.48A. In this thesis, Atmega16 is used to control the2-switch buck-boost converter and a50Wp photovoltaic with a maximum voltage of 21V and a current of 3.48A..

Effect of Increased Molecular Force Attraction of NiO (Nickel Oxide) on the Kinetic and Potential Energy of H2O Molecules for Efficient H2O Splitting into H2 Gas

Achmad Walid, Haris Puspito Buwono, Lisa Agustryana, Nurhadi — Mon, 24 Jun 2024 00:00:00 +0700

Nickel oxide (NiO) is a material used due to its remarkable chemical stability, magnetic properties, and electrical characteristics molecules. One notable feature of NiO is its unreactive surface with water (H2O), making it an ideal candidate for use as a cathode in the electrolysis process to produce hydrogen (H2) gas. During electrolyte process, H₂ is produced through the oxidation reaction at the anode and the reduction reaction at the cathode. Despite its potential, the detailed mechanism of H2O molecule decomposition using a NiO electrode remains inadequately explained. This research aims to elucidate the increased energy arising from the attractive forces between NiO and H2O molecules. To investigate these attractive forces, simulations were conducted to understand the chemical characteristics of the molecules, including bond lengths, bond angles, and their properties. The results indicated that the use of NiO electrode could increase the potential and kinetic energy of H₂O molecules. This energy increase is attributed to the formation of specific polar and non-polar bonds. Specifically, polar bonds were formed between (1) the nickel (Ni) atom in NiO molecules and the oxygen (O) atom in the H₂O molecules and (2) the O atom in NiO molecules and the H atom in the H₂O molecules. Non-polar bonds were formed between (1) the H atom in the H₂O molecules and the Ni atom in NiO molecules, and (2) the O atom in NiO molecules and the O atom in H₂O molecules. This study highlights how these interactions help in the electrolysis process by enabling the efficient breakdown of water molecules and the production of hydrogen gas

Stability Analysis of Retaining Soil Walls Protecting Banu Canal, Ngantru Village, Ngantang District, Malang-Indonesia

Suhudi Suhudi, Fifi Damayanti — Thu, 27 Jun 2024 00:00:00 +0700

The frequent occurrence of landslides in the Ngantang District, Malang Regency, especially in Ngantru Village, is caused by topographic conditions, where the area is hilly because it is located at the foot of Mount Kelud. Likewise, along the Banu Irrigation Area Channel there are points prone to landslides, especially in the upstream part. These landslides result in the channel breaking so that the irrigation water supply is disrupted. DPT (Soil Retaining Wall) is a building structure whose role is to maintain the stability of the soil on sloping land. The existence of this wall is expected to be able to prevent the soil from moving or landslides. Therefore, to protect the Banu Irrigation Area Channel, a DPT construction was built where the DPT details used were stone masonry construction or the Gravity Wall type. With a total height of 3.9 m, the bottom sole width is 1.00 m and the upper sole width is 0.50 m. The purpose of this paper is to analyze whether the existing DPT is safe against the forces that work, especially analyzing its stability, then comparing it with other DPT designs with the Cantilever Wall type. Based on the analysis of calculations for the Existing Gravity Type Earth Retaining Wall, the stability figures for soil bearing capacity σ max= 23.76 > 15.012 (safe ), stability against sliding hazards Fgs=3.321 ≥ 1.5 (safe ), and stability against sliding hazards Fgs=3.321 ≥ 1.5 (safe ) are obtained. = 6.26 > 1.5 (safe ) while for cost calculations the value obtained is IDR 180,390,000.00 (One Hundred and Eighty Million Three Hundred and Ninety Thousand Rupiah). Meanwhile, for the analysis of the comparative soil retaining wall for the cantilever type, the stability figures for soil bearing capacity σ max= 25.92 > 15.012 (safe), stability against sliding hazards Fgs=3.55 ≥ 1.5 (safe ), and stability against overturning hazards were obtained. SF= 6.64 > 1.5 (safe ).

Improving the Quality of Frozen Chicken Sempol Products Using the Six Sigma Method at UMKM Suropati Pasuruan

Sun, 28 Jul 2024 00:00:00 +0700

Suropati MSME is a frozen chicken abacus producer in Pasuruan Regency. More and more competitors require compani to improve the quality of their products as a step to prevent consumers from moving to competing products. Quality problems have not been fully implemented by Suropati MSME as seen from the large number of defective products. The purpose of this study is to determine the factors that cause product defects and provide suggestions for improvements that are in accordance with the conditions of MSME so as to achieve zero defects. The method used is six sigma DMAIC (Define, Measure, Analyze, Improve, and Control) with Failure Mode and Effect Analysis (FMEA). The sigma value obtained is 2.821 while the % final yield is 81.358%. The contributing factors are man (33.33%), machine/equipment (16.67%), method (33.33%), and environment (16.67%). The proposed improvements given are additional employees, the use of alarms, the use of production equipment according to production capacity, and temporary closure of the selling place.