cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
Dharu
Contact Email
dharufs@staff.uns.ac.id
Phone
+6281217717892
Journal Mail Official
mesin@ft.uns.ac.id
Editorial Address
Jl. Ir. Sutami no 36 A, Building I, Faculty of Engineering, Universitas Sebelas Maret, Surakarta
Location
Kota surakarta,
Jawa tengah
INDONESIA
Mekanika: Majalah Ilmiah Mekanika
Published by Universitas Sebelas Maret
ISSN : 14127962     EISSN : 25793144     DOI : https://doi.org/10.20961/mekanika
Core Subject :
"Mekanika: Majalah Ilmiah Mekanika" is an open-access journal published by Mechanical Engineering Study Program, Faculty of Engineering, Universitas Sebelas Maret. Mekanika invites scholars, researchers and practioners who have interest in mechanical engineering to publish their articles and also provides forums for them to share their works and knowledge. Mekanika focuses on the area of materials engineering and science, design, energy, manufacturing and construction but is not limited to. Both English and Bahasa are accepted in this journal. Mekanika has two issues every year (March and September) and aims to publish more frequently in the future.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 75 Documents
 1   2   3   4   5 
Lunch Box Innovation Product Design In The Millennial Era Pranoto, Bayu; Firmansyah, Hilmi Iman; Wicaksono, Hangga; Fakhruddin, Muhammad; Perkasa, Rilis Eka
Mekanika: Majalah Ilmiah Mekanika Vol 20, No 2 (2021): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v20i2.52100

Abstract

Almost all kids still bring a lunch box and a bottle of water in their bag when they go to school. His mother always prepares a lunch box complete with a drinking water bottle, hoping that his son can enjoy his favorite lunch and avoid starvation. Sometimes the mother is distraught when the child has brought the lunch box, but the water bottle is left behind. Then the mother was willing to take her child's water bottle to her school. This is certainly not expected by either the mother or the child. As a form of concern for the author to this problem, the author proposes a lunch box design with a lunch box lid that also functions as a drinking water bottle. The idea of this design proposal is one grab. Both are food & drink in your hand. The goal is how to make kids can grab their food and drink quickly and practice. So, it is proposed to modify the top cover of the standard food pack to become a drink bag. The design process begins with analyzing market needs, making sketches, creating 3D design models using the Autodesk Inventor application, material selection, and product evaluation.
Design, Production Cost, and Air Flow Distribution of Biomass Pellet Furnace Sutanto, Heru; Suyitno, Suyitno; Juwana, Wibawa Endra; Nurrohim, Tito Gusti
Mekanika: Majalah Ilmiah Mekanika Vol 20, No 2 (2021): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v20i2.49232

Abstract

Biomass attracts a great deal of attention because it is converted into green fuels in the form of pellets. The furnace is needed to burn pellets to generate up to 300 kW of heat. In addition to meeting the heat capacity needs of small and medium-sized industries, furnaces must also be competitive in terms of price. Therefore, the purpose of this study is to obtain details of the cost of manufacturing the furnace and the airflow model that occurs in the furnace. This study employs a forward and reverses engineering approach, beginning with determining load and capacity, drawing, determining the bill of materials and manufacturing, numerical modeling of airflow with ANSYS FLUENT, fabrication, and final testing. The outcome revealed that the furnace's production cost included manufacturing costs, assembly costs, machining, and repair costs. The findings revealed that the critical portion of the cost of the furnace was the material cost of 77%. The simulation findings showed that the total pressure difference of up to 850 Pa had to be resolved by air-supplying blowers. The gas velocity ranged from 2 to 10 m/s and increased significantly near the exit to 42 m/s.
Effect of Turbine Blades Transformation on Savonius Turbine Performance Abdul Alim, Muhammad Iyas; Hadi, Syamsul; Priha Tjahjana, Dominicus Danardono Dwi
Mekanika: Majalah Ilmiah Mekanika Vol 21, No 1 (2022): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v21i1.48619

Abstract

This study aimed to determine the effect of the transformation of Savonius turbine blades based on the Coefficient of Performance (Cp)-Tip Speed Ratio (TSR) curve. The transformation referred to here is the change in the blade angle so that the area of the cross-section of the returning blade is changed. Therefore, the opposing torque of the turbine obtained from the airflow is reduced. The specimen has three variations, without transformation or conventional turbine, the transformation of 5°, and transformation of 10°. With the reduction in the cross-sectional area of the returning turbine blade, it is expected that the turbine performance will increase. Experiments were carried out using wind tunnels with load variations at an air speed of 5, 6, and 7 m/s. The experimental result shows that the blade transformation movement causes a shift in the center of mass, increasing the turbine vibration that directly affects turbine performance. The negative effect from the vibration is greater than the positive effect caused by reducing negative torque. The experimental results show that conventional turbines have better performance than turbines with 5° and 10° blade transformations.
The Effect of Fumigation and Alkalization on Dimensional Changes of Cantula Fiber Reinforced Unsaturated Polyester Composites Under Immersion Wibowo, M. Ihsan Tri; Ariawan, Dody; Surojo, Eko
Mekanika: Majalah Ilmiah Mekanika Vol 21, No 1 (2022): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v21i1.49463

Abstract

This study investigates the effect of fumigation and alkaline treatment on dimensional change in cantala fibers reinforced Unsaturated Polyester Resins (UPRs) composite under immersion test in an aqueous environment. Composites were fabricated using the compression molding method with cantala fiber content of 30% vt with the addition of 5% microcrystalline cellulose. Composite specimens were immersed under aquades for two months at room temperature. The dimensional changes of cantala fiber-reinforced UPRs in different solutions followed a Fickian behavior. The dimensional change of composites in solution shows the saturation point after several weeks of immersion. Fumigation-treated fibers and alkali-treated fiber composites after immersion have lower results in dimensional changes and slope than untreated fiber composites.
Nanofiber Semiconductor Experiment with Distance Variation Electrospinning Method to Improve DSSC Performance Widhiyanuriyawan, Denny; Arifin, Zainal; Hadi, Syamsul; Fadli, Muhammad Rijalul
Mekanika: Majalah Ilmiah Mekanika Vol 21, No 1 (2022): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v21i1.51479

Abstract

Dye-Sensitized Solar Cell (DSSC) is a solar cell that uses dyes to transfer sunlight to electrical energy. DSSC construction uses a layered system (sandwich) that consists of a working electrode and an opposing electrode, both of which are placed on conducting glass and electrolytes to allow electron cycling. DSSC has a high price, so increasing efficiency is needed to use these solar cells more widely. This research aims to determine the effect of the distance between the tip and the rotating collector to increase the efficiency of the Dye-Sensitized Solar Cell (DSSC) and examine its impact on the morphology of the ZnO nanofiber. This experiment is carried out by varying the distance between the tip to the rotating collector, 4 cm, 6 cm, and 8 cm. This research indicates that at a distance of 8 cm, it produces a small, uniform, and stable ZnO nanofiber structure with Voc, Jsc, FF, and DSSC efficiency values of 0.559 V, 9.809 mA/cm2, 43.3%, and 2.3%. In addition, at a distance of 8 cm, it also produces the highest DSSC electrical efficiency from the other distances due to the absorbance of the dye and high electron excitation. 
Analysis Nozzle Temperature Effect in 3D Printer Fused Deposition Modelling (FDM) On Mechanical Properties and Characteristics of Polylactic Acid (PLA) Setiawan, Agris; Rizky, Muhamad Alfa; Sukamto, Untung
Mekanika: Majalah Ilmiah Mekanika Vol 21, No 1 (2022): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v21i1.59221

Abstract

Fused Deposition Modelling (FDM) 3D Printer is a revolutionary technology inAdditive Manufacturing (AM). Polylactic Acid (PLA) is a biodegradable andcompostable polymer formed from the condensation of lactic acid. This experimentalstudy uses a nozzle temperature variation of 210 °C, 220 °C, 230 °C and infill type ishoneycomb pattern which print speed of 3D printer is 80mm/s to print the specimen.The specimen of tensile test was conducted based on American Society for Testing andMaterial (ASTM) standard D638 type 4, while the specimen of flexural test wasconducted based on ASTM standard D790. tensile test, flexural test, andmacrostructural analysis will be carried out to determine the effect of nozzletemperature on the test. Based on the results of the study, it was found that the shrinkageproduced by 3D Print specimens for tensile tests and flexural tests at nozzletemperature 230 °C was very high, namely 2.83% and 4.33%, respectively. nozzletemperature at 230 °C produces a fairly high Ultimate Tensile Strength (σUTS) andFlexural strength (σFS) of 39.60±2.60 MPa and 49.02±0.76 MPa, respectively. Inmacrostructural analysis, the nozzle temperature porosity at 230 °C produces thesmallest porosity of 0.04 mm2 or 1.46%.
Frictional Characterization Of Grey Cast Iron Train Brake Block Using A Reduced Scale Dynamometer Utama, Bernardus Prasetya; Budiono, Herru Santoso; Surojo, Eko; Muhayat, Nurul
Mekanika: Majalah Ilmiah Mekanika Vol 21, No 1 (2022): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v21i1.48246

Abstract

The brake block is an essential component that slows down and stops the train. The safety of this transportation is very dependent on the reliability of this component. One of the essential features of the brake block material is the coefficient of friction. The coefficient of friction of the brake block material should fulfill the requirements. The coefficient of friction of a material is measured using a friction test. Many friction testing methods have been developed to study the characteristics of friction materials. In contrast to previous studies, in this study, the frictional characteristics of gray cast iron brake blocks were evaluated using a reduced scale dynamometer. The friction test is carried out by pressing the brake block specimen to the surface of the rotating wheel. The specimen size of the brake block and carriage wheels is reduced to ¼ of the original size. The friction test is carried out at a contact pressure of 0.15, 0.20, 0.25, and 0.30 MPa and the friction speeds of 3, 6, 9, and 12 m/s. This study indicates that the coefficient of friction of the gray cast iron brake block decreases with increasing sliding speed and contact pressure.
Design of the Bengawan Unmanned Vehicle (UV) Roboboat: Mandakini Neo Nubli, Haris; Utomo, Fahri Setyo; Diatmaja, Hananta; Prabowo, Aditya Rio; Ubaidillah, Ubaidillah; Susilo, Didik Djoko; Wibowo, Wibowo; Muttaqie, Teguh; Laksono, Fajar Budi
Mekanika: Majalah Ilmiah Mekanika Vol 21, No 2 (2022): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v21i2.61624

Abstract

Mandakini Neo was made with the ship's capacity, speed, and comfort in mind, as well as the ship's hydrodynamic performance and construction cost. Therefore, the method used to determine the hydrostatic characteristics is through a simulation consisting of a resistance test, stability test, maneuver test, and seakeeping test. The simulation uses Maxsurf software with the Savitsky method, which is then processed by data. Global Positioning System (GPS) and ultrasonic sensor tests were also conducted. Based on the simulation results, the stability of the Mandakini Neo ship has a GZ value of 0.1417 m with an angle of 30°, which follows the standards of the International Maritime Organization (IMO). In testing, the maneuvers obtained have met IMO standards based on tactical and advanced diameters. Based on the seakeeping test, when the speed is 5 knots, the heave movement has the same magnitude for all wave headings, 0.0096 m. while the most considerable rolling motion is in the wave direction of 135°, which is 0.36 m, and the most considerable pitch motion is in the direction of the 180° wave, which is 0.042 m. At a speed of 10 knots, the heave motion produced is the same as for all wave headings.
Effect of Holding Time and Temperature of Hot Pressing on Tensile Strength of Biodegradable Plastic Made of Carrageenan Imaduddin, Fitrian; Sastra, Palgunadi; Raharjo, Wijang Wisnu; Wullandari, Putri; Ridwan, Ridwan
Mekanika: Majalah Ilmiah Mekanika Vol 21, No 2 (2022): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v21i2.64292

Abstract

Biodegradable plastic can be made from carrageenan by the hot press method. This method can make biodegradable plastic with large dimensions. However, the plastic quality depended on the holding time, temperature, and pressure selected during the hotpressing process. Therefore, this research is conducted to determine the effect of holding time and temperature in the hot press process on the tensile strength of biodegradable plastic made from carrageenan. The composition of the biodegradable plastic material used was 35% carrageenan, 35% polyvinyl alcohol, and 30% glycerol. The tensile strength of the composite was observed through tensile testing using a universal testing machine. fourier-transform infrared spectroscopy, X-ray Diffraction (XRD), and Scanning Electron Microscopy (SEM) tests were also conducted to sharpen the analysis. The addition of holding time led to an increase in the tensile strength of biodegradable plastics. The highest tensile strength was obtained at a holding time of 30 minutes with a value of 4.45 MPa. After 30 minutes, the tensile strength of the biodegradable composite decreased. Meanwhile, the addition of process temperature caused a decrease in the tensile strength of biodegradable plastics. The highest tensile strength was obtained at a process temperature of 100 °C with a value of 5.28 MPa.
Effect of Alkaline Treatment and Fumigation on the Mechanical Properties of Fiber Unsaturated Polyester-Cantula Composite with Compression Molding Method Salim, Muhamad Saifuddin; Ramadhan, M. Rafidya Bintang; Fanani, Elvira Wahyu Arum; Ariawan, Dody; Surojo, Eko
Mekanika: Majalah Ilmiah Mekanika Vol 21, No 2 (2022): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v21i2.51493

Abstract

This research examines the strength of the Unsaturated Polyester Resins (UPRs)-Cantala composite with the addition of filler Microcrystalline Cellulose (MCC). Composites were created with a Volume Fraction (VF) of 30% and a 45° angle. This angle variation received the same treatment as the others, including untreated, alkaline, and fumigation. The treatment time for alkali treatment was six hours, while the treatment time for fumigation was 10 hours. The strength of each angle variation was determined, as well as its treatment of tensile strength, modulus of elasticity, and Poisson ratio UPRs-Cantala composites. According to the results, the alkali treatment produced the highest tensile strength and modulus of elasticity values. The highest Poisson ratio value was discovered without treatment at a 45°. The alkaline treatment yielded the highest tensile strength and modulus of elasticity test results. The pullout fiber fracture dominated the untreated composite fracture, whereas the fiber breakage fracture dominated the alkaline treatment.

Page 2 of 8 | Total Record : 75

 1   2   3   4   5 

Filter by Year

2021 2026


Reset
Filter By Issues
All Issue Vol 25, No 1 (2026): MEKANIKA : Majalah Ilmiah Mekanika Vol 24, No 2 (2025): MEKANIKA : Majalah Ilmiah Mekanika Vol 24, No 1 (2025): MEKANIKA : Majalah Ilmiah Mekanika Vol 23, No 2 (2024): MEKANIKA : Majalah Ilmiah Mekanika Vol 23, No 1 (2024): MEKANIKA: Majalah Ilmiah Mekanika Vol 22, No 2 (2023): MEKANIKA: Majalah Ilmiah Mekanika Vol 22, No 1 (2023): MEKANIKA: Majalah Ilmiah Mekanika Vol 21, No 2 (2022): MEKANIKA: Majalah Ilmiah Mekanika Vol 21, No 1 (2022): MEKANIKA: Majalah Ilmiah Mekanika Vol 20, No 2 (2021): MEKANIKA: Majalah Ilmiah Mekanika Vol 20, No 1 (2021): MEKANIKA: Majalah Ilmiah Mekanika More Issue