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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 7 Documents

Search results for , issue "Vol 4 No 2 (2021): Teknomekanik" : 7 Documents clear

Analysis of Tensile Strength of Citronella (Cymbopogon Nardus) Fiber Reinforced Composite Materials Julio Lukmanul Ardi; Hendri Nurdin; Andril Arafat; Sri Rizki Putri Primandani
Teknomekanik Vol 4 No 2 (2021): Teknomekanik
Publisher : Universitas Negeri Padang

The use of synthetic fibers in composite materials has a negative impact on the environment. One way to reduce this impact is to replace synthetic fibers with natural fibers. A natural fiber that has the potential as a mixed material in the manufacture of composite materials is citronella (Cymbopogon nardus) fiber. This study aims to determine the effect of volume fractions 40%, 50%, 60%, and 70% of citronella fiber with polyester resin matrix BQTN 157 on tensile strength. The process of making composites used the hand lay-up method. The specimen was formed according to the ASTM D3039 standard and the tensile strength of the specimen was tested by using a Universal Testing Machine (UTM). From the results of the study, the maximum tensile strength was found in the fiber volume fraction 70% of 77.35 MPa, the strain is 6.57%, and the modulus of elasticity is 1.177 GPa. This study indicates that fiber volume fraction affects the tensile strength of composite materials. Hence, the manufacture of composite materials which have good strength is influenced by many things such as raw materials, matrices, mixture composition, and methods.

Ball-Mill Assisted Green One-Pot Synthesis of ZnO/Graphene Nanocomposite for Selective Electrochemical Sensing of aquatic pollutant 4-nitrophenol Kavya P; Soorya V S; Binitha N Narayanan
Teknomekanik Vol 4 No 2 (2021): Teknomekanik
Publisher : Universitas Negeri Padang

ZnO, having good transparency, high electron mobility and lower electrical noise, is an excellent material for electrochemical studies. Due to its high surface area and electrical conductivity, graphene is well suitable for the good dispersion of metal oxides for electronic/electrochemical applications. Graphene prevents particle agglomeration, whereas the addition of metal oxide prevents layer restacking in graphene. The bulk preparation of graphene via cost-effective and green methods are preferred. The aromatic conjugated π-network along the whole surface is not attained in large scale graphite oxide assisted production due to the defects and functional groups introduced during the hazardous synthetic procedure. Here, less defective graphene is synthesised via ball milling of graphite using metal oxalate as an exfoliating agent for the first time. Calcination of metal oxalate inserted graphite leads to the enormous evolution of gases thereby sliding the graphitic layers, leading to the formation of graphene sheets decorated with ZnO spherical nanoparticles’ bunches. The layer exfoliation and metal oxide incorporation are achieved here via a one-pot synthesis strategy. The use of ZnO/graphene in the selective sensing of 4-nitrophenol is investigated using cyclic voltammetric measurements in the presence of interfering compounds such as glucose, uric acid, ascorbic acid and H2O2.

Quantitative Risk-Based Inspection on Gas Riser Pipelines at Offshore Facilities Mhd. Ibkar Yusran Asfar; Johny Wahyuadi Soedarsono; Arie Wijaya; Taufik Aditiyawarman; Dony Soelistiyono; Romal Ramadhan
Teknomekanik Vol 4 No 2 (2021): Teknomekanik
Publisher : Universitas Negeri Padang

Numerous pipeline failures have occurred due to the drastic increase in oil and gas product distribution pipelines over the last three decades. Corrosion is a significant factor in the failure of offshore gas pipelines. It is necessary to maintain the integrity of the offshore transmission system, one of which is the riser, for the product to be adequately distributed. The purpose of this study is to ensure the riser's reliability by conducting a risk assessment of the probability and consequences of equipment failure, mitigating the impact of failure risk, and developing a more optimal inspection plan. The API 5L Grade X60 gas riser pipe is the subject of this study. The quantitative Risk-Based Inspection (RBI) technique was used in 2016 following the API 581 standard. This quantitative approach is founded on a numerical value model constructed using validated operational data and inspection results. The risk assessment indicates that the gas riser pipelines will have a high-risk level (5D) for the splash zone segment and a medium-risk level (2D) for the above-and below-water segments. The recommended inspection plan for the gas riser pipeline is one year after the risk-based inspection assessment.

Performance Comparison of Ground Source Heat Pump (GSHP) against Air Source Heat Pump (ASHP) for Domestic Applications: A case study in Perth, Australia Tine Aprianti; Evan Tan; Chan Diu; Ben Sprivulis; Greg Ryan; Kandadai Srinivasan; Hui Tong Chua
Teknomekanik Vol 4 No 2 (2021): Teknomekanik
Publisher : Universitas Negeri Padang

The goal of this research is to evaluate the efficacy and practicality of installing a ground source heat pump (GSHP) with an air source heat pump (ASHP) in a residential setting. The results of this comparison were obtained by monitoring each of the systems in two almost identical residences in Perth, Western Australia. There is an open-loop groundwater system in the previous home. Each residence has one family whose air conditioning system has its own set of operational needs. The cooling capacity supplied and coefficient of performance (COP) as a function of seasonal changes in ambient temperatures were determined using data gathered from both residences over a two-year period. For both heating and cooling, the GSHP system COP was found to be greater than that of the ASHP system. Furthermore, these two performance measures were independent of ambient circumstances in the former, but they exhibit a noticeable ambient dependent trend in the latter. The GSHP had an average COP of 4.0 for heating, regardless of external conditions, while the ASHP COP ranged from 2.0 to 3.0. Conversely, the GSHP had an average COP of 3.2 for cooling, whereas the ASHP COP ranged from 1.4 to 2.9. It is found that GSHPs result in significant operational cost reductions and a significant decrease in greenhouse gas emissions when a borewell is part of a home.

Development of Wireless Piezofilm Sensor for Monitoring Vehicle Suspension System Muhamamad Zuhairy Zulkifli; Zaihasrah Masron; Saltanat A. Omarova
Teknomekanik Vol 4 No 2 (2021): Teknomekanik
Publisher : Universitas Negeri Padang

The use of piezoelectric sensors in the data acquisition of vibration signal for monitoring systems on vehicles is a practical way to determine the performance of vehicle suspension systems (VSS). However, the transmission of vibration signal data through piezoelectric sensors still relies on conventional techniques, such as wires, which can cause problems in areas with limited space and pose a safety risk for moving vehicles. This study developed a wireless piezofilm sensor-based data acquisition device to monitor VSS using an Arduino microcontroller as a signal processor and a Bluetooth HC-05 module as a wireless communication link with a control terminal. The data acquisition process is carried out by measuring the electrical signal resulting from the vibration of the piezofilm sensor caused by the dynamic motion of the VSS operation. The signal data acquired from the car's body and lower arm was analyzed using the Fast Fourier Transform (FFT) analytical method for comparison. The results of the analysis show that the vibration increases with the increase of the car speed. It found that the vibration at the lower arm of the car is higher than the body part. It can conclude that the developed wireless piezofilm device is effective and capable of performing VSS monitoring.

An Analysis of Slip Incidence for Ankle Angle and Muscle Fatigue During Walking Activities Sharifah Aznee Syed Ali; Seri Rahayu Kamat; Momoyo Ito
Teknomekanik Vol 4 No 2 (2021): Teknomekanik
Publisher : Universitas Negeri Padang

Human walking speed exposes the higher potential to slip accident especially walking on the oily surface. Prolong walking during working will develop fatigue to the leg and certain body part. In a certain industry, there was a need that worker had to walk and standing in prolong before reaching their break. The aim of this study was to analyze the ankle angle and the muscle fatigue during walking and influence in slip incident. The study involves twelve health participants aged from 23 to 57 years old with a mean of BMI was 27.82 ± 4.01 kg/m2. The procedure will be explained the detail when the participant agreed. Vicon motion capture was used to record movements and the Electromyography (EMG) was used to record muscle fatigue activity. The finding shows that the slip occurred frequently for overweight and obese participants. The female participant experience slips more than a male participant. The range of ankle angle during slip was from 97.2 ± 6.7° for male participants and 112.5 ± 12.7° for female participants. The muscle Soleus and Tibialis were producing high muscles fatigue during slip occurrence. The results of the study show that muscle fatigue was significant with the occurrence of slipping during walking speed. Other findings presented that overweight and obese participants' significant slip occurred when walking on oily surfaces. Both aged groups represent the slip occurrence, there was no significant factor of aged during slip occurrence.

Utilization of Sewage Sludge Using Multiple Thermal Conversion Processes Ta-Hui Lin; Annas Fauzy; Guan-bang Chen; Fang-Hsien Wu
Teknomekanik Vol 4 No 2 (2021): Teknomekanik
Publisher : Universitas Negeri Padang

Sewage sludge is a usual waste from urban areas that can be utilized in many renewable energy sources. In this study, we examine the sewage sludge utilization using pyrolysis process to produce pyrolytic oil using Taguchi methods, combustion characteristic of sludge pyrolytic oil (SPO) blend with heavy fuel oil (HFO), and co-gasification of sewage sludge with CO2/steam as the gasification medium using Taguchi methods. The best-operating conditions for the pyrolysis of sewage sludge are a heating rate of 10oC/min, temperature of 450oC, the residence time of 60 min, and N2 flow rate of 700 mL/min. Under these conditions, the obtained pyrolytic oil yield is very close to the result from the Taguchi method calculation. In the combustion characteristic of sludge pyrolytic oil (SPO) blend with heavy fuel oil (HFO), a higher SPO in the fuel blend enhances the occurrence of micro-explosion and reduces the size of the residual. Higher SPO content in the fuel blend increases the combustion rate and increases the ignition delay due to moisture evaporation. In the co-gasification of sewage sludge and palm kernel shell optimization using Taguchi method, the best operational condition for maximum H2/ CO syngas ratio reaches at the gasification temperature of 900 C, a blending ratio of 30%, a CO2/(CO2+H2O) ratio of 70%, and a catalyst addition of 20% bed material mass. The best operating condition for maximum concentration of H2 reach with gasification temperature of 800 C, a blending ratio of 40%, a CO2/(CO2+H2O) ratio of 70%, and a 15% catalyst addition of bed material mass. The CO2/(CO2+H2O) ratio is the most important parameter among both case.

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Rahmat Azis Nabawi

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+6281277328670

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Jl. Prof. Dr. Hamka Kampus UNP Air Tawar

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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

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