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Teknomekanik

teknomekanik
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Published by Universitas Negeri Padang

ISSN : 26219980 EISSN : 26218720 DOI : 10.24036/tm.

Core Subject : Engineering,

Mechanical Engineering

Teknomekanik is an international journal that publishes peer-reviewed research in engineering fields (miscellaneous) to the world community. Paper written collaboratively by researchers from various countries is encouraged. It aims to promote academic exchange and increase collaboration among scientists, engineers and researchers to support sustainable development goals.

Arjuna Subject : Teknik (semua kategori) - Teknik Mesin

Articles 99 Documents

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Development of Technology for Processing Pyrite Cinder to Produce Non-Ferrous Metal Concentrate Abikak, Yerkezhan Baimuratovna; Kenzhaliev, Bagdaulet Kenzhalievich; Gladyshev, Sergei Vladilenovich; Abdulvaliev, Rinat Anvarbekovich
Teknomekanik Vol. 5 No. 1 (2022): Regular Issue
Publisher : Universitas Negeri Padang

The existing technologies for processing of pyrite cinder require improvement for complex extraction of non-ferrous, precious metals and iron. The novelty of the technology used in the work for the processing of pyrite cinders is the preliminary chemical activation in a solution of sodium bicarbonate. The optimal activation modes were determined according to temperature, duration, L:S ratio and NaHCO3 concentration. It has been established that activation of pyrite cinder results in changes in phase composition and a reduction in the content of the impurity components P2O5, SO3 and As2O3. The leaching of pyrite cinder after pre-activation in 15 % H2SO4 solution resulted in an extraction into solution, wt. %: CuO 76, 8; ZnO 75, 9 and Fe2O3 26, 0. The degree of extraction of non-ferrous metals in sulphuric acid solution without chemical activation is lower by 15 - 20 %.

Development of Passive Battery Management System at TRL 4 Singh, Mukesh; Kamboj, Rahul Kumar
Teknomekanik Vol. 5 No. 1 (2022): Regular Issue
Publisher : Universitas Negeri Padang

Nowadays, the usage of the electric vehicle (EV) is exponentially increasing. Therefore, a battery management system (BMS) is required to properly operate the Li-ion battery used in electric vehicles for extending the battery life. The main function of BMS is to sense the voltage, current, and temperature of the battery and cells independently. Further, it evaluates different parameters from the data fetched by the BMS. Finally, based on the evaluation, it controls the cell balancing. Presently, BMS is implemented using different microcontrollers and is under improvement with the advancement in existing technology. Passive balancing is commonly used in BMS, since, it is inexpensive and straightforward to implement. The passive resistor uses the passive balancing method to discharge the battery’s excess charge. For small battery capacities, this resistor is very useful. This paper analyses BMS design which combines a power resistor and transistor as a balancing resistor. The proposed analyses were applied to a battery pack consisting of 13 lithium-ion battery cells which enabled a fast-charging scheme. The most significant features of the passive balancing system are based on the results of this experiment, taking into account the impact on battery performance and energy loss. The aim of this paper is to make a battery pack that is with high energy carrying capability and proper thermal runaway. Thus, extensive monitoring is needed to operate the battery within specified operating limits to avoid fire hazards and explosions. In order to achieve this, the proposed design creates a demand for a Sophisticated management system which not only optimize the power drawn from battery but also maintain the battery operation within specified limits.

Characteristics of Calorific Value of Briquettes Made From Cymbopogon Citratus Waste As an Alternative Fuel Nurdin, Hendri; Wagino, Wagino; Sari, Delima Yanti; Siregar, Batu Mahadi
Teknomekanik Vol. 5 No. 1 (2022): Regular Issue
Publisher : Universitas Negeri Padang

Product diversification through Cymbopogon citratus briquettes as an alternative fuel for the development of renewable energy. The waste from the Cymbopogon citratus production process is a potential source of renewable energy that can be used as briquettes. This is an alternative to reduce dependence on fuel oil energy which is the main need for ordinary people. The purpose of developing Cymbopogon citratus waste briquettes with various variances and the use of tapioca adhesive, in obtaining the characteristics of the calorific value of briquettes. The method of making briquettes by using a press and optimizing the composition of the appropriate mixture as an effort to get the calorific value. From this research, the calorific value of Cymbopogon citratus briquettes is 8230.65 kJ/kg at a percentage mixture of 90 : 10 and its density is 394.90 kg/m3. From the acquisition of these characteristic values, it can be recommended as an alternative fuel in an effort to develop renewable energy in the utilization of lemongrass waste.

The Wind Turbine Design and Test Paranchis, Mark Irwin; Pratama, Hendri
Teknomekanik Vol. 5 No. 1 (2022): Regular Issue
Publisher : Universitas Negeri Padang

Green energy harvester, known as wind turbine, able to convert mechanical works to electrical power. There are two main type of wind turbine that considered thoroughly, which are the horizontal and vertical axis wind turbine respectively. This project mainly focus on the design of new wind turbine that can operate well together in low wind speed condition in Malaysia. For the first stage of this project, the problems, purpose, and planning regarding with the project properly determined. Literature survey then furthered analyzed in order to know the wind power or behavior across the world, and specifically in Malaysia, research of turbine that can work in low wind speed condition, as well as parameter that often used in designing wind turbine by previous researcher. From the literature survey, the selected turbine was a Three-Bladed Savonius Wind Turbine, which is one type of Vertical Axis Wind Turbine (VAWT). That turbine will be attached to another VAWT turbine system to help generate more power and better performance. Design theoretical calculation and material selection have been properly analyzed before fabrication can be done. Upon completion of the fabrication, Savonius wind turbine section properly tested through experimental works by using simple wind tunnel in Faculty of Engineering Mechanical Workshop, and all readings and data collected using applicable tools and equipment. For the experimental works of Savonius rotor, the variable includes of blades curve angle from its center at different wind speeds. The data collected then interpreted through charts and graph for comparison and performance analysis, and conclude that 1200 blades curve angle from its center was the best among the other type of blades. From this project, it can be concluded that this type of mix wind turbine able to works in low wind speed condition in Malaysia, but a better improvisation and modification of the mix wind turbine will certainly improve its further performance and efficiency.

The Risk Identification On 3" GL BO3-52520 Process Pipelines Using a Risk-Based Inspection Method Putra, Angga Pratama; Soedarsono, Johny Wahyuadi; Pangesty, Azizah Intan; Yusran asfar, Muhammad Ibkar; Aprizal, Aprizal; Ramadhan, Romal
Teknomekanik Vol. 5 No. 1 (2022): Regular Issue
Publisher : Universitas Negeri Padang

The oil and gas industry can contribute significantly to sustainable development by mitigating negative environmental impacts, such as equipment failure. Numerous pipeline failures have occurred due to the dramatic expansion of the oil and gas product distribution pipeline network, which is a significant factor in the offshore gas pipeline network's failure. In general, compared to other equipment types in the industry, planning inspections presents more challenges. Due to a lack of jurisdictional requirements regarding inspection intervals and piping methods. This research aims to ensure the reliability by conducting a risk assessment of the likelihood and consequences of equipment failure, mitigating the impact of that risk, and developing a more optimal inspection plan. This study is focused on API Class 5L Pipe 3" GL BO3-52520. The Routine Inspection Technique (RBI) was implemented in 2016 following the API 581 standard. This semi-quantitative approach is built based on operational data and validated inspection results. According to the risk assessment, the pipeline will have a Medium risk level, with metal losses occurring in each segment. Four years after the risk-based inspection assessment, the recommended inspection plan for gas pipelines is four years.

Cellulose Nanofiber Platform for Electrochemical Sensor Device: Impedance Measurement Characterization and Its Application for Ethanol Gas Sensor Rakhmania, Citra Dewi; Sari, Shaimah Rinda; Azhar, Yosyi Izuddin; Sugita, Airi; Tominaga, Masato
Teknomekanik Vol. 5 No. 1 (2022): Regular Issue
Publisher : Universitas Negeri Padang

Bioplastics such as cellulose nanofibers (CNF) are widely used in daily life as an alternative to plastics. CNF is also considered a biodegradable, readily disposable, and low-cost material, making it suitable as a sensor platform. The mechanically treated CNF has both hydrophobic and hydrophilic properties where the hydrophobic sides bond strongly with MWCNTs to provide conductivity on the CNF sheet, while the hydrophilic sides allow the target component to be adsorbed on its laminated structure and react with the electrode surface. From an electrochemical measurement of ferricyanide solution indicated that the MWCNTs modified CNF could act well as electrode. Furthermore, the thin-sheet electrode successfully detected ethanol based on a direct electron transfer (DET) between PQQ-ADH and the MWCNTs on the electrode surface. Aside from its lightweight properties, the developed CNF electrode possesses excellent stretchability, flexibility, and adjustability to human skin, making it ideal for a future wearable skin gas sensor.

Material selection for raw gas pipeline at SBR#2 gas field Riady, Rado; Soedarsono, Johny Wahyuadi; Riastuti, Rini; Adipurnama, Iman
Teknomekanik Vol. 5 No. 2 (2022): Regular Issue
Publisher : Universitas Negeri Padang

In engineering design, material selection is the process of choosing the best material for a specific process via a systematic material selection approach. This article described the material selection process for SBR#2 pipeline, which will be installed to flow raw gas from SBR#2 field to the nearest tie-in point. The material selection process starts with design requirement analysis to generate primary function and objectives, including its constraints, determine primary criteria to be evaluated, screen materials candidates based on criteria evaluation, and select the most suitable materials based on very specific requirements. The criteria were evaluated by performing value engineering with the performance criteria matrix tool. Materials selection, in this case, was determined by two main criteria: corrosion resistance and construction ability. Corrosion resistance was evaluated semi-quantitatively by applying NORSOK M-506 2005 spreadsheet, and construction ability were evaluated qualitatively based on field experience. Solid Corrosion Resistance Alloy (CRA)-Stainless Steel 316L pipe is the most suitable for this case.

Quality function deployment analysis of smartphones NSB, Akhil; Kumar, Vimal; De, Tanmoy; Klangrit, Suriya
Teknomekanik Vol. 5 No. 2 (2022): Regular Issue
Publisher : Universitas Negeri Padang

To utilize the concept of Quality Function Deployment (QFD) and apply it appropriately to address design decisions concerning the quality of cellular phones, a simplified version of the House of Quality (HoQ) will be built. Real customer requirements (CRs) are easier to collect when QFD is employed because it puts the emphasis on the customer and their demands where it should be. After gathering various users' opinions on different smartphone brands and conducting an online survey with mobile users in Taichung, Taiwan, the study highlights the items preferred by most users, such as long-lasting battery life, high-quality camera, reliability, wide screen, ease of use, and lightweight. This aids businesses in translating CRs into primary Design Requirements (DRs) so that they can create superior goods that align with consumer demands.

Numerical analysis of flow characteristics of the oil-water mixture in stratified-annular horizontal pipe Erizon, Nelvi; Jasman, Jasman; Irzal, Irzal; Aldio, Muhammad Fikhri; Saputra, Aprizal; Tin, Chau Trung
Teknomekanik Vol. 5 No. 2 (2022): Regular Issue
Publisher : Universitas Negeri Padang

The loss of oil fluid flow in the piping system in the petroleum industry due to friction is the cause of low efficiency. To reduce friction loss, the viscosity of petroleum can be lowered by adding water as a mixture. Actually, the flow loss in a piping system is influenced by several factors including flow pattern, fluid type, flow velocity, flow pressure and pipe diameter. This study aims to determine the effect of flow patterns on changes in velocity in the two-phase flow of oil and water in a piping system. This numerical analysis research was carried out using Fluent 6.2 software with variations in the velocity of the oil-water mixture: 0.2, 0.4 and 0.6 m/s. The simulation results show that the greatest pressure loss occurs at a fluid velocity of 0.6 m/s where the flow is stratified mixed. While the smallest pressure loss at a mixture velocity of 0.2 m/s when the flow is stratified smooth. From the results of the study, it can be concluded that the increase in fluid flow velocity has a positive correlation with the increase in the value of flow losses in the pipe.

Cellulose derivative as protection coating: Effect of nanoparticle additives on load capacity Shi, Shih-Chen; Tsai, Xiao-Ning
Teknomekanik Vol. 5 No. 2 (2022): Regular Issue
Publisher : Universitas Negeri Padang

The cellulose derivative hydroxypropyl methylcellulose (HPMC) has recently been extensively studied and used in mechanical applications. However, the softness and susceptibility to deformation of HPMC limited its further applications. In this study, metal nanoparticles (nano-aluminum and nano-copper) and nano-metal oxide particles (nano-alumina and nano-copper oxide) were used as additives to HPMC to form a composite film with improved mechanical properties, particularly load capacity. The addition of high levels of additives provided a higher load capacity. Among the nano-additives used in the study, Cu (2 wt.%) provided the composite with the highest load capacity, improving the load capacity of pure HPMC by 250%. The surface treatment of strengthening additives is an important step. Adding specific high-strength and high-modulus metal and metal oxide additives to the soft HPMC matrix can effectively improve the load-bearing capacity of the composite material. This study proposes a simple evaluation method for the load-bearing capability of the coating as well.

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Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name Rahmat Azis Nabawi

Contact Email raazna@ft.unp.ac.id

Phone +6281277328670

Journal Mail Official Syahril@ft.unp.ac.id

Editorial Address Jl. Prof. Dr. Hamka Kampus UNP Air Tawar

Location Kota padang, Sumatera barat INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Contact Name
Rahmat Azis Nabawi

Contact Email
raazna@ft.unp.ac.id

Phone
+6281277328670

Journal Mail Official
Syahril@ft.unp.ac.id

Editorial Address
Jl. Prof. Dr. Hamka Kampus UNP Air Tawar

Location
Kota padang,

Sumatera barat

INDONESIA