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REKAYASA
Published by Universitas Trunojoyo Madura
ISSN : 02169495     EISSN : 25025325     DOI : https://doi.org/10.21107/rekayasa
Core Subject : Science, Agriculture, Engineering,
Agriculture, Biological Sciences & Forestry Computer Science & IT Electrical & Electronics Engineering Engineering Physics
This journal encompasses original research articles, review articles, and short communications, including: Science and Technology, In the the next year publication, Rekayasa will publish in two times issues: April and Oktober.
Arjuna Subject : -
Articles 504 Documents
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Karakterisasi Pengecoran Paduan Al-Si-TiB dengan Variabel Suhu Die Casting Abdus Shomad, Muhammad; Wisnujati, Andika; Mudjijana, Mudjijana
Rekayasa Vol 15, No 3: Desember 2022
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v15i3.15438

Abstract

This study describes the microstructure phase and the hardness value produced in metal casting with variations in metal mold temperature with the addition of Ti-B elements. gravity casting, a technique that relies solely on gravity, is used for casting metals. This objective of this study to determine the mechanical properties characterization of specimens using die casting molds by varying the mold temperature between 250°C, 350°C, 450°C and the addition of 0.05% Ti-B alloying elements. In addition, this research can determine the right temperature for metal casting by gravity casting method. The material used in this research is recycle piston Al-Si (series 4xxx). The results of hardness testing at a temperature of 250°C have produced 123.9 HVN. The microstructure of the Al-Si-TiB alloy material has dense grain boundaries. This is because the casting with the addition of the TiB element functions as a grain refiner and reduces porosity in the microstructure. So, the smaller the porosity, the stronger the hardness of the specimen or material. This is because at low mold temperatures, the metal casting process will freeze faster, resulting in higher hardness. In addition, the increasing temperature of the die casting mold has a tendency to change the eutectic structure of silicon to primary silicon.
Modeling and Performance Testing of Anti-Lock Braking System (ABS) with Variation of Road Friction Coefficient to Braking Distance Ulum, Miftahul; Arifianto Patriawan, Desmas
Rekayasa Vol 15, No 3: Desember 2022
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v15i3.16561

Abstract

Automated vehicles are increasingly being researched and developed to reduce accident rates. The braking system is an integral part of the safety factor in the vehicle. One of the development systems in braking on vehicles is the Anti-lock Braking System (ABS). ABS is a vehicle b that prevents the wheels from locking during sudden braking. The research was conducted by modelling and designing the ABS braking system using SIMULINK software on MATLAB. This research was conducted by varying the coefficient of braking friction on dry asphalt, wet asphalt, dry soil, and wet soil by paying attention to the braking distance. In the first test, the first test of the non-ABS system sets 0.9. The results were obtained with the shortest braking distance of 20 meters and the farthest, 34.5 meters. As for the results with ABS, the shortest braking distance is 17.95 meters, and the farthest is 27 meters. From the analysis that has been done, it is found that the ABS is better than the non-ABS system. This is because ABS regulates the braking calliper and is adjusted to the vehicle’s dynamics instead of statically. When there is a difference in vehicle speed with different wheels too far (while the wheels will lock), the calliper on the brakes will open and close dynamically, unlike non-ABS
Uji Performansi Alat Pengering Tipe Terowongan Hohenheim Aceh Dengan Aplikasi Proportional Integral Derivative Controller Untuk Kipas Outlet Khathir, Rita; Hartuti, Sri; Hardiyanti, Ulfa
Rekayasa Vol 15, No 3: Desember 2022
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v15i3.15541

Abstract

The purpose of this study was to evaluate the performance of Hohenheim Aceh type solar tunnel dryer with the application of proportional integral derivative (PID) controller for outlet fans. The instrumentations used were solar tunnel dryer type Hohenheim Aceh, HTC-meter, anemometer, pyranometer, and other supporting equipments. The results showed that during the drying process solar irradiation had fluctuated, where the average solar irradiation was 649 W/m2. The average temperature in the drying chamber is 40.6°C while the average temperature in the environment is 32.9°C. Conditions in the drying chamber were suitable for drying because the temperature inside the dryer was relatively higher than the ambient temperature. The average relative humidity (RH) in the drying chamber was 36% and the average RH in the environment was about 40%. The relationship between temperature and RH value was negative and strong indicated bu r-value of 0.7379. On the other hand, the relationship between solar irradiation and temperature was positive and also strong indicating that the energy source for this dryer was from solar irradiation with an R-square of 86.02% and r-value of 0.92747. The application of PID controller had improved the performance of Hohenheim Aceh type solar tunnel dryer by preventing the incident of unproper drying temperature. However, the airflow in the drying chamber was too low thus the further engineering design is needed to improve the drying system.
Beras Analog: Solusi Tepat Guna Olahan dari Jagung, Labu Kuning dan Kulit Pisang Herawati, Reni; Faizah, Siti; Bimantara, Bingar; Supriyanto, Supriyanto
Rekayasa Vol 15, No 3: Desember 2022
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v15i3.14490

Abstract

Stunting is a stunted development of the brain and body of toddlers due to malnutrition since the first 1000 days of life. Stunting is a problem because toddlers grow up as the nation's successors. Fulfillment of toddler nutrition can be by consuming analog rice. The purpose of the study was to determine the best analog rice formulation from corn flour, banana peel flour and pumpkin flour and the characteristics of analog rice from physical, chemical and amino acid tests. The research method used RAL (Completely Randomized Design). The formulations of corn flour, pumpkin flour and banana peel flour were divided into 3 levels, namely the ratio (6:2:2), (6:2:1), (6:1:2). The addition of water consists of 2 levels, namely 1:1 and 1:1.5. The best analog rice was the result of sensory test followed by physical, chemical and amino acid tests. The results showed the best formulation (6:2:1) with the addition of water 1:1.5. The color test shows an average brightness of 15.56-22.239, an average redness of 5.319-8.800, an average yellowness of 28.222-29.933. Texture test obtained hardness value of 79.511 N, adhesiveness 0.119 N, Cohesiviness of 1.141 and fracturability of 2.4493 and springiness of 0.541. The value of water content is 7.21%, protein is 10.98%, carbohydrates is 73.81%, vitamin A is 67.501%, amino acids are isoleucine content is 45.60 mg/g, leucine is 118.87 mg/g, lysine is 38.91 mg/g. g, methionine 18.24 mg/g, threonine 52.00 mg/g, valine 56.16 mg/g, and phenylalanine 72.35 mg/g. 
Pendekatan Structural Equation Modelling (SEM) dalam Operasi Logistik : Studi Kasus Operasi Amfibi TNI Angkatan Laut Yahya Prasetyo; Marthin Luther; Etwin Ramadhan; Jumino Jumino
Rekayasa Vol 15, No 2: Agustus 2022
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v15i2.16420

Abstract

Along with the development of naval technology, the roles, tasks and functions of the support of the Motorized Transport Battalion (Yon Angmor) have the complexity and dynamics of movement in supporting the implementation of Amphibious Operations, which are very important and have high traffic. In this study, conducted to identify and analyze organizational readiness, readiness in the field of Operations as an element of Satbanmin, and the readiness in the field of Logistics as an element of Satbanmin in the implementation of Amphibious Operations. The results of the measurement using SEM AMOS 23 software from the measurement model of the three variables of operational readiness, organizational readiness and logistical support readiness that affect administrative assistance support, that the operational readiness variable produces the highest value of 0.566. This means that the implementation of the operational readiness of the Yon Angmor in supporting administrative assistance in Amphibious operations can be carried out optimally and according to SOPs, despite having obstacles and problems in organizational readiness. So, to answer the existing problems, the Yon Angmor needs to plan the formation of an organization through organizational validation, as well as calculating risk management in supporting administrative assistance in the implementation of comprehensive amphibious.
Pengaruh Variasi Campuran Bentonit Terhadap Karakteristik Pasir Cetak Untuk Proses Sand Casting Shieddieque, Apang Djafar; Putra Nugraha, Ismail; Zaenal Muttahar, Mochammad Iqbal; Heryana, Ghany
Rekayasa Vol 15, No 3: Desember 2022
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v15i3.16194

Abstract

The casting process is widely used because it has the advantage of being able to make products with small dimensions to very large dimensions, the use of materials is more efficient, the casting products can be directly used. However, in the casting process, the main triggers for the formation of defects are the nature of the mold, low permeability, low molding compressive strength, low sintering point, unsuitable sand grain distribution, so research is needed to obtain the right type of molding sand as a sand mold in metal casting. The only type of additive is bentonite. Bentonite can absorb water and expands between 8-15 times and remains dispersed in water for a certain period of time. This study aims to examine the effect of a mixture of variations of local bentonite and Australian bentonite on the characteristics of the molding sand for the sand casting process. The tests carried out are in the form of size distribution testing, X-Ray Diffraction, water content testing, compressive strength, and permeability measurements. Bentonite was varied into 5 variations of the mixture with a difference of 20% in each mixture. The results of the large size distribution of silica sand grains were 37.6 GFN. The results of XRD testing of local bentonite showed a higher content of calcium compounds and Australian bentonite contained higher sodium compounds. The largest water content test value is 5.825%. The largest compressive strength test value is 2.7 Kgf /cm2.
Kehandalan Struktur Anjungan Lepas Pantai Terpancang Empat Kaki di Perairan Natuna Hermanto, Mochammad Fathurridho; Nandalianadhira, Nafisa
Rekayasa Vol 15, No 3: Desember 2022
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v15i3.16663

Abstract

The design of offshore platforms in Indonesia generally uses Working Stress Design (WSD) method rather than Load and Resistance Factor Design (LRFD) method. Whereas the LRFD method produces designs that better describe real conditions with load and capacity factors. The load and capacity factors are obtained from consideration of the uncertainty or randomness of their values. One of the load factors used is the environmental load factor. The environmental load factor of LRFD method is obtained based on environmental characteristics not in Indonesian waters. There are differences in the environmental characteristics of each water. Uncertainty of environmental loads in the offshore platforms design is wave height, current velocities, and wind speed. To get a structure designed according to the characteristics of the waters in Indonesia, an environmental load factor is needed in accordance with the characteristics of Indonesian water. To achieve that, structural reliability analysis is needed. Structures reliabilty represents the possibility of the structure's performance criteria being met which is expressed by the reliability index. The reliability index of structures designed using the WSD method used as a reference for LRFD method. In this study, reliability analysis was carried out using the reserve strength ratio value from the pushover analysis on WSD method. The reliability index of the structure model is 4.10. This value is categorized as high reliability. This results can be used as a reference to determine the environmental load factor of Indonesian water in the future.
Sintesis Biokomposit Serat Sabut Kelapa dan Resin Poliester dengan Alkalisasi KOH Menggunakan Metode Hand Lay-Up Nisa, Khadijah Sayyidatun; Melyna, Ella; Samida, Muhammad Rizky Mubarak
Rekayasa Vol 15, No 3: Desember 2022
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v15i3.16713

Abstract

Development of bio-composite materials is growing rapidly, as these materials are light, strength, and have good resistance to corrosion. Moreover, bio-composite is one of many options to utilize agricultural waste. Polyester resin and coconut coir fiber can be utilized as matrix and filler for bio-composites. Alkalization is a method to obtain high quality cellulose from natural materials. The objective of this study is to examine the effect of KOH concentration on tensile strength and hardness of coconut coir fiber and polyester resin composite. The composite was successfully synthesized using hand lay-up method. Tensile strength and hardness tests were conducted to examine the composite’s physical properties, meanwhile Fourier Transform Infrared was employed to examine the material’s functional group. Bio-composite with coconut coir fiber and polyester ratio=40:60 yielded the highest tensile strength of 6.04 MPa. Furthermore, the composites that are synthesized with alkalization using KOH concentration of 5%wt, 10%wt, 15%wt, and no alkalization produced tensile strength 5.29, 6.92, 3.50, and 3.50 MPa respectively. In addition, the composites with KOH concentration of 5%wt, 10%wt, 15%wt, and no alkalization generated hardness 70, 73, 73, and 72 Shore D respectively. It can be concluded that the higher coconut coir fiber ratio, the higher the bio-composite’s tensile strength. 
Reduksi Kadar Oksalat dalam Umbi Porang Menggunakan Variasi Konsentrasi, Suhu dan Lama Perendaman dalam Larutan NaCl dan Akuades Febrianti, Evril Pramestari; Wardani, Ratih Kusuma
Rekayasa Vol 15, No 3: Desember 2022
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v15i3.16804

Abstract

Porang tubers contain compounds that have been widely used in health and industry, namely glucomannan. In addition, porang tubers also contain oxalate compounds that cause itching and burning when consumed directly. Porang tubers that have been cut with a size of 2x2 cm and a thickness of 0.5 cm are soaked using a solution of NaCl and distilled water. Immersion is used to reduce oxalate levels with variations in concentration, temperature and immersion time. Soaking porang tubers in either NaCl or distilled water can reduce oxalate levels. NaCl solution with a concentration of 7% has the highest % decrease in oxalate levels, which is 69.83%. NaCl solution has a better ability to reduce oxalate levels compared to distilled water. The immersion time of porang tubers with NaCl solution for 45 minutes had lower levels of oxalate than using distilled water for 60 minutes, namely 1.0809% (w/w). Porang tubers soaked in NaCl solution at a temperature of 60°C obtained a higher % decrease in oxalate levels compared to distilled water at the same temperature, which was 55.58%.
Analisis Environmental-DNA (E-DNA) Untuk Estimasi Jumlah Total Bakteri Pada Air Kolam dengan Sistem Recirculation Aquaculture System (RAS Kurniawan, Andi; Amin, Abd. Aziz; Guntur, Guntur; Susanti, Yogita Ayu Dwi; Wiryawan, Adam; Pramudia, Zulkisam; Okuda, Hideki; Yanuar, Adi Tiya
Rekayasa Vol 15, No 3: Desember 2022
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v15i3.16844

Abstract

Catfish is an aquaculture commodity that has great potential to be developed in various regions in Indonesia. The success of catfish cultivation is primarily determined by creating a suitable environment for catfish. One way to create a suitable environment for catfish cultivation is the Recirculation Aquaculture System (RAS). In applying RAS, the presence of organic matter in the pond is controlled so the pond water can be reused. The presence of organic matter in pond water is determined mainly by the activity of bacteria in the water. These bacteria are actively involved in the pond's residual organic matter degradation process. Therefore, the total number of bacteria in the water can be one of the essential parameters in the RAS. The method widely used to calculate the abundance of bacteria is counting the number of bacteria based on bacterial culture method. However, the bacteria that can be cultured are only a small part of the bacteria in the water, so the abundance value obtained does not reflect the actual bacterial population. Therefore, it is necessary to analyze the abundance of bacteria using a method closer to the actual abundance value, such as the environmental DNA (eDNA) analysis. This study aims to analyze the abundance of bacteria in water in catfish aquaculture with RAS using the eDNA method. In addition, this study also analyzes water quality data (temperature, pH, Dissolved Oxygen). This study's results indicate that the water temperature value in catfish ponds ranges from 28.0 to 29.0 °C, the average pH value is 7.7, and the dissolved oxygen is between 5.7 - 6.2 mg/L. The water quality analysis results indicate that RAS can maintain optimum conditions in the catfish cultivation process. This study also showed that the total microbial abundance value at the beginning of cultivation was 1.68 × 107 cells/ml, and on day 30, it was 3.6 × 106 cells/ml. The dynamic of bacterial densities in this study may indicate that this system can maintain the stability of the microbial community. 

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