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W D Lestari
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Availability of Palm Oil Biodiesel in Indonesia and Its Effect on Diesel Engine: A Review W Saputro; W D Lestari; L Edahwati; R D Issafira; A K Faizin; N Adyono; T P Sari
Biomedical and Mechanical Engineering Journal (BIOMEJ) Vol. 1 No. 2 (2021): BIOMEJ
Publisher : Mechanical Engineering Department at Universitas Pembangunan Nasional "Veteran" Jawa Timur

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Abstract

Palm oil is one of the base ingredient that can be used in making of biodiesel which is an alternative fuel to replace diesel fuel. The ability of palm oil as biodiesel should be balanced with the quantity of palm oil as well as the level of biodiesel production capability. In this paper, authors try to analyze about palm oil as biodiesel starting from number of palm plantations up to the level of biodiesel production capability from palm oil. The analysis conducted in the first part of this paper can be used as a reference that shows the level of availability of the palm oil which can be processed into biodiesel as an alternative fuel in the future. In the next part, the authors tried to analyze the impact of biodiesel made from palm oil starting from engine performance, exhaust gas emissions, rate of wear, quality of lubricant, and deposit formed. It was is done in order to find out the advantages and disadvantages that occur from biodiesel so that it can be used as a reference or consideration in the use of biodiesel-fueled palm oil.
Non-Premixed Combustion Simulation with Variation of Swirl Burner Slope using Turbulence Modeling K-ɛ R D Issafira; W Wijayanti; L Edahwati; W D Lestari; W Saputro; A K Faizin; N Adyono; T P Sari
Biomedical and Mechanical Engineering Journal (BIOMEJ) Vol. 1 No. 2 (2021): BIOMEJ
Publisher : Mechanical Engineering Department at Universitas Pembangunan Nasional "Veteran" Jawa Timur

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Abstract

Combustion is a very complex matter. Therefore, we need to know the phenomenon that occur in combustion apart from the temperature distribution. This research uses quasi-research. The background in using quasi-experimental is because it has advantages in data collection. Moreover, the phenomena that occur in more detailed research by means of a numerical approach could also be observed. This research was conducted with an approach (simulation) of diffusion combustion using methane (CH4) fuel and air containing 29% oxygen (O2), 71% nitrogen (N2) and the addition of swirl in the air ducts. k-ɛ turbulence modeling was aaplied in this somulation. This variation of the fuel velocities are 3 m/s, 5 m/s, 7 m/s, where the air velocity was varied for 3 m/s, 5 m/s, 7m/s. In this simulation, room pressure of 1 atm was applied for the surrounding. The results showed that, the greater the angle of inclination of the swirl burner, the shorter the flame. And on the variation of fuel velocity, we get the result that the higher fuel velocity, increase fire height; however, the temperature of the fire height will decrease.
Manufacturing Acetabular Liner UHMWPE using CNC Milling W D Lestari; L Edahwati; R D Issafira; W Saputro; A K Faizin; N Adyono; T P Sari
Biomedical and Mechanical Engineering Journal (BIOMEJ) Vol. 1 No. 2 (2021): BIOMEJ
Publisher : Mechanical Engineering Department at Universitas Pembangunan Nasional "Veteran" Jawa Timur

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Ultra High Molecular Weight Polyethylene (UHMWPE) is a biomedical polymer that is useful in the orthopedic field as a bearing component in artificial hip joints. In general, these polymers pair up and rub against each other with metallic biomaterials, namely 316L stainless steel, cobalt chromium (CoCr) and titanium, which can cause material wear problems. One way to increase the wear resistance of UHMWPE is through the manufacturing process. The purpose of this research is to manufacture acetabular liner products using a CNC milling machine to obtain high surface quality and dimensional accuracy. The CNC milling machine used is the type of YCM 1020 EV 20. The manufactured specimen is then measured for roughness and dimensional accuracy. Based on the measurement results, it is found that the acetabular liner specimens from the CNC milling process are still in accordance with the standard ASTM standard (F 2033-12).
Mini Factory Laboratory From Technology Reverse Engineering Ballet Reactors in Struvite Formation L Edahwati; S Sutiyono; W D Lestari; R D Issafira; W Saputro; A K Faizin; N Adyono; T P Sari
Biomedical and Mechanical Engineering Journal (BIOMEJ) Vol. 1 No. 2 (2021): BIOMEJ
Publisher : Mechanical Engineering Department at Universitas Pembangunan Nasional "Veteran" Jawa Timur

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Abstract

Reverse Engineering (RE) can be interpreted as procedures and processes in dismantling an object to find out the materials, working methods, or technology used so that the object can function properly. Design activities using the reverse engineering concept make it easier for students to understand product specifications, product advantages and disadvantages, product production processes and production cost estimates before designing new products. The laboratory is one place that can be used to carry out the reverse engineering process. The bulkhead reactor is an alternative to the stirred tank reactor with the aim that the resulting product is maximized both in terms of quantity and morphology or shape of the material. The benefit of disassembling this product is as a first step in understanding the concept of reverse engineering in the task of designing machines or tools. From the results of the study, it was found that the formation of struvite occurred at pH 9 using an air flow rate of 1 l/minute.
Secondary Flow Phenomenon at Elbow Ducting of The Closed-Circuit Subsonic Wind Tunnel: An Experimental Study A K Faizin; Sutardi; L Edahwati; W D Lestari; N Adyono; R D Issafira; W Saputro; T P Sari
Biomedical and Mechanical Engineering Journal (BIOMEJ) Vol. 2 No. 1 (2022): BIOMEJ
Publisher : Mechanical Engineering Department at Universitas Pembangunan Nasional "Veteran" Jawa Timur

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Abstract

The installation of elbow ducting in closed-loop wind tunnel installation will cause a pressure drop. Pressure drop was caused by flow separation and secondary flow phenomenon in the elbow ducting. The test section used in this experimental study was an octagonal elbow 90º with radius ratio (rm/Dh) = 0.6. Diameter hydraulic (Dh) elbow of 806 mm. In this study, the Reynolds number is measured based on the free flow velocity (U∞) inlet section, that is ReDh = 4.63x105. The experimental results showed the pressure drop is ΔCp = 1.46 for Re = 4.63x105. This difference in pressure value between the outer and inner (ΔCp) of the elbow ducting was caused by secondary flow. The secondary flow was observed through a horizontal velocity profile where at xi/Dh = 1.35, fluid flow was accelerated on the inner wall and decelerated on the outer wall of the ducting elbow. Then, at xi/Dh = 1.63 to xi/Dh = 2.01, there are gradual shifts of the velocity profile where the fluid flow is accelerated toward the outer wall.
Torque Load Analysis on Rear Axle Shaft Material AISI 4340 Normalized F A Nurmansyah; L Edahwati; W D Lestari; R D Issafira; W Saputro; A K Faizin; T P Sari; N Adyono
Biomedical and Mechanical Engineering Journal (BIOMEJ) Vol. 2 No. 2 (2022): BIOMEJ
Publisher : Mechanical Engineering Department at Universitas Pembangunan Nasional "Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/biomej.v2i2.59

Abstract

Abstract. The choice of rear axle shaft material on the car needs to be considered because this component affects the performance of the car. This component material is also very necessary, the selection of components used is AISI 4340 Steel Normalized, where this material contains Nickel, Chrom, and Molybden with the characteristics of the AISI 4340 Steel Normalized material is a steel material that has high hardness properties, can accept great pressure and force and not easy to deform. The method used is the Finite Element Method (FEM), this method uses a meshing size of 5 mm, to get more accurate results. Simulation results from rear axle shaft AISI 4340 Steel Normalized to determine the value of stress, strain, and safety factor from load variations of 1200 Nm, 1400 Nm, 1600 Nm, and 2000. The highest maximum stress value occurs at 2000 Nm torque load of 5.586 x 108 Nm. The highest maximum strain value occurs at a torque load of 2000 Nm of 5.034 x 103. The safest value of the safety factor is 2.1 at a torque load of 1200 Nm. The torque load value is directly proportional to the stress and strain values ​​obtained, because the greater the torque load value, the greater the stress and strain values ​​obtained.
Static Loading Analysis on Universal Joint Using Solidworks M Ikhsan; L Edahwati; R D Issafira; A K Faizin; W Saputro; W D Lestari; T P Sari; N Adyono
Biomedical and Mechanical Engineering Journal (BIOMEJ) Vol. 2 No. 2 (2022): BIOMEJ
Publisher : Mechanical Engineering Department at Universitas Pembangunan Nasional "Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/biomej.v2i2.60

Abstract

Abstract. Community service with the topic of introduction to analysis and training CAD/CAM for SMK teachers has become a necessity. This static loading analysis introduction training aims to analyze parts universal joints to the tensile test as an effort to accelerate the improvement of vocational teachers' abilities. In the introduction to analysis training this time using software CAD/CAM ie solidworks which is one software CAD/ CAM which is widely used in the manufacturing industry in terms of designing or analyzing a product design. The training method is carried out by first installing solidworks software to computer equipment, secondly making parts from universal joints, third assembling from parts that have been made, fourth doing drawing 2D from part and assembly that have been made, the five static loading analyzes of universal joint parts with tensile test. Election software this is based on its advantages such as easy to learn, widely used in industry, and can be used as a reference for studying software another. As a result of this training, it is hoped that the teachers of SMK Turen Malang will be able to make part3D models and 2D working drawings.
Artificial Neural Network Application for Sepsis Prediction: A Preliminary Study A K Faizin; R D Issafira; W Saputro; L Edahwati; W D Lestari; T P Sari; N Adyono
Biomedical and Mechanical Engineering Journal (BIOMEJ) Vol. 2 No. 2 (2022): BIOMEJ
Publisher : Mechanical Engineering Department at Universitas Pembangunan Nasional "Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/biomej.v2i2.61

Abstract

Abstract. Sepsis is one of the leading causes of mortality in hospitalized patients. It is very difficult to find the symptoms of sepsis because of their similarity to the symptoms of other diseases. This paper aims to deliver an artificial neural network implementation in medical decisions support. This study tries to predict sepsis and healthy patient based on vital signs such as heart rate, systolic blood pressure, and diastolic blood pressure taken from the MIMIC-III clinical database. There were several extraction processes applied to vital sign signals such as using the statistical tools, discrete wavelet transforms, and Hilbert-Huang Transform. The ANN algorithm predicts the sepsis patient with 96.7% of accuracy. However, based on the medical requirement for artificial intelligent implementation, this result does not satisfy the requirement as the false positive error is 2.9%.
Combination Filtration - Ultraviolet Unit to Reduce the Organic Content and Pathogens of Domestic Wastewater For Clinical Activities R Novembrianto; Munawar; M A S Jawwad; R H A Murti; W D Lestari; M N Rhomadhoni
BIOMEJ Vol. 2 No. 1 (2022): BIOMEJ
Publisher : UPN 'Veteran" Jawa Timur

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Abstract

The rise of clinical activities is one of the health care facilities that have the potential to pollute wastewater on organic compounds and especially pathogenic microorganisms. Technology in reducing organic and pathogenic content using combined ultraviolet filtration in wastewater treatment systems is one the effective method. Filtration uses activated carbon and silica with a variation of the ratio 2:3 and 3:2, while ultraviolet use a power variation of 9 watts and 15 watts. The results obtained are the best composition from the filtration process, which is a ratio of 2: 3 with the ultraviolet process using 15 watts using an exposure time of 5 hours with the remaining total coliform as much as 200 MPN/100mL. The results of this research have complied with the quality standards.
Identification of Cetane Number in Solar Fuel from Pyrolysis of Plastic Waste T Towijaya; K Anam; W D Lestari
BIOMEJ Vol. 2 No. 1 (2022): BIOMEJ
Publisher : UPN 'Veteran" Jawa Timur

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Abstract

The use of fuel is currently increasing, as well as the increasing number of plastic waste that comes from household and industrial waste. The need for processing plastic waste to reduce the volume of waste is very necessary. One type of plastic waste is the type of polypropylene. This type of polypropylene plastic waste is a type of waste that can be used as a basic material to produce alternative fuels in the types of diesel, gasoline, and kerosene. In this research work, a test will be carried out to determine the cetane number of this type of diesel fuel produced by the pyrolysis process, to the treatment of temperature and time variables so that a high cetane number is produced. Plastic waste processing uses pyrolysis and distillation methods to produce alternative fuels with processing temperatures of 190ºC, 200ºC, and 225ºC in 3 hours, 4 hours, and 5 hours. From testing the cetane number on the pyrolysis fuel, the cetane number from the process of making this alternative fuel itself reached the highest number, namely 64.1 at a processing time of 5 hours at a temperature of 200ºC.
Co-Authors A K Faizin A K Faizin F A Nurmansyah K Anam L Edahwati M A S Jawwad M IKHSAN M N Rhomadhoni MUNAWAR N Adyono N Adyono R D Issafira R D Issafira R H A Murti R Novembrianto S Sutiyono Sutardi T P Sari T Towijaya W Saputro W Wijayanti