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All Journal Agromet Jurnal Teknik Mesin Jurnal Polimesin
Akhyar Akhyar
Department Of Mechanical Engineering, Faculty Of Engineering. University Of Syiah Kuala, Banda Aceh, Indonesia, 23111
Agriculture, Biological Sciences & Forestry Automotive Engineering Control & Systems Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering

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 1 
The Use of SST Anomaly to Predict Seasonal Rainfall during the Second Planting Period in the Tanoh Abee Irrigation Area, Aceh Besar Ahmad Farhan; Yopi Ilhamsyah; . Akhyar
Agromet Vol. 34 No. 2 (2020): DECEMBER 2020
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/j.agromet.34.2.100-109

Abstract

Irrigation in Tanoh Abee is used for agricultural activities especially during the second planting season during dry season. However, the availability of irrigation water is controlled by total rainfall received. An accurate prediction of rainfall, which traditionally used “keneunong” local wisdom, is urgently required. The objective of the study is to obtain the best predictor of seasonal rainfall based on the Pacific sea surface temperature (SST) anomaly and the monthly lead time of prediction. We employed monthly rainfall from six stations surrounding the study area and combined with principal component analysis to eliminate rainfall autocorrelation. Seasonal rainfall (quarterly average) was calculated from monthly data. The results showed that 1-month lead time strongly correlated to seasonal rainfall in Tanoh Abee (r<-0.7, α=5%) for the second planting period. On other hand, the 2-month and 3-month lead time were useful to predict seasonal rainfall in March-April-May (MAM) only. For April-May-June (AMJ) and May-June-July (MJJ), the correlation between SST anomaly and seasonal rainfall was weak. This finding indicated that the accuracy of prediction decreases with the longer lead time. Based on our analysis, coordinates of 170° E – 175° E; 5° N - 5° S in Niño 4 region have strongly correlated with seasonal rainfall in MAM, AMJ, and MJJ periods. Moreover, further research is necessary to combine any approaches that will improve our prediction skill for another 2- or 3-month lead time.
Desain dan Analisis Rangka Mobil Listrik Malem Diwa X.2 Model Prototype Menggunakan Metode Elemen Hingga Iskandar Hasanuddin; Muhammad Tadjuddin; Hasan Akhyar; Mardhatillah Mardhatillah
Jurnal Teknik Mesin Unsyiah Vol 7, No 1 (2019)
Publisher : Jurnal Teknik Mesin Unsyiah

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (17.414 KB) | DOI: 10.24815/jtm.v7i1.14021

Abstract

 Supplies of fossil fuels as an energy source that is depleting became its own challenges in the provision of energy to the continuation of the future. One alternative is to become energy electrical energy. Study conducted in this study is meant to make the eco-friendly vehicles, one example is the electric car. Light vehicle weight and becomes a keyword in doing energy saving in everyday. The research was carried out using the element method to the frame of the car, with condition of load static – general. The software used in this study is ABAQUS. From the results stress result maximum stress of 1.972 x 105 Pa, maximum strain results of 2.592 x 10-6, while the displacement that occurred was of 2.858 x 10-7 m. Research results obtained that the car frame able to withstand loads given of 700 N, so that, it can be concluded that the framework of this car is secure against a given load.
Economic Impact Analysis Versus Investment Analysis: Cast-Bike Frame Manufacturing from Recycled Aluminum Alloy Akhyar Akhyar; Abdillah Imron Nasution; Ali Mulyagusdin; Masri Ibrahim
Jurnal Teknik Mesin Unsyiah Vol 9, No 1 (2021)
Publisher : Jurnal Teknik Mesin Unsyiah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jtm.v9i1.21620

Abstract

This paper discusses the standard economic impact analysis (EIA) and investment analysis of bicycle frame innovation products from recycled aluminum alloy. An input-output (I-O) model is using to perform the EIA. The indicators used for the economic impact analysis are the number of companies that produce bicycles, the number of workers, the number of products per year for the production of cast-bike from aluminum alloy recycled. Regarding employment support in the bicycle industry sector, the discussion arises in Labor productivity in ASEAN. Bicycle frame innovation from recycled aluminum alloy is interesting to study. There are two advantages, such as a simple production process and the use of recycled materials. As a result, the selling value of bicycle products is cheaper than other bicycles. The cast-bike from the aluminum recycled production process is also discussed in detail, starting from the design, simulation of stresses caused by loading conditions, material availability, and the production process.
Pengaruh Komposisi Paduan Al-Si Terhadap Kerentanan Hot Tearing - Akhyar; - Suyitno
Jurnal Teknik Mesin Unsyiah Vol 1, No 1 (2012)
Publisher : Jurnal Teknik Mesin Unsyiah

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (17.41 KB)

Abstract

Hot tearing and hot cracking is a metal alloy casting product defects caused by several factors such as alloy composition, casting temperature, mold temperature, mold shape and even casting system itself. The study has been developed to find the phenomenon of the hot tearing by varying the alloy composition, techniques and methods. Increasing Si alloy composition can improve hot-tear, mold modification CRCM (constrained Rod Casting Modified) Horizontal method can be used to analyze the hot tearing. The material used is aluminum with Si composition is 0.24pwt as base and material ADC12 as additive with Si composition is 10.56pwt to increase Si composition. Hot-tearing sensitibility value obtained by using the equation then showing into the chart HTS footprint. HTS values ​​for Si alloy with a composition of 0.24pwt is 12 and the HTS value for alloys with compositions 1.05pwt Si is 18. Cracks formed in the product starting with the smooth (hairline cracks) category to the complete (specimen broken) category. The higher Si content can increase the cracked in product castings, so that the higher Si composition more tendency to tear.
Perancangan dan Pembuatan Dapur Peleburan Logam dengan Menggunakan Bahan Bakar Gas (LPG) Amir Zaki Mubarak; - Akhyar
Jurnal Teknik Mesin Unsyiah Vol 1, No 3 (2013)
Publisher : Jurnal Teknik Mesin Unsyiah

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (17.41 KB)

Abstract

Foundry industry is very important in the development of both machinery and household products. Furnace is important utility in producing a product. Available furnaces in the market are very costly and difficult to obtain due to be imported from abroad. Responding these issues, in this study is designed and developed a furnace that is simple, easy to manufacture, portable and most importantly the price is low so that it is affordable for industrial-scale domestic foundry industry. The furnace is heated with LPG (Liquefied Petroleum Gas) as the gas is economical and obtainable. Refractory stones are used as a heat insulator to increase the temperature in the combustion chamber to reach 1,000 oC. The heat can be set via the setting of gas that goes into the combustion chamber so that it can be adapted for different types of material with a melting temperature below 1,000 oC. The type of metal melted in this research is aluminum. The test results showed that the furnace is able to melt 0.39 kg of aluminum in 30.15 minutes.
Produksi Baling-Baling Kapal dari Logam Daur Ulang melalui Teknik Pengecoran Logam Akhyar Akhyar; Khairil Khairil; Ahmad Farhan; Masri Ibrahim; Suhaeri Suhaeri
Jurnal Teknik Mesin Unsyiah Vol 8, No 2 (2020)
Publisher : Jurnal Teknik Mesin Unsyiah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jtm.v8i2.20679

Abstract

The boat propellers are needed for fishing boats in Aceh Province, considering that most Acehnese people geographically live along the coastline. Their income apart from farmers is fishermen. Currently, the metal ship propellers are imported from outside Aceh Province, so metal casting technology is needed to produce these ship propellers. There is already a small-scale industrial for metal casting, and the location is in Baet Lampuot - Aceh Besar District. The metal casting industry is currently producing rencong souvenirs to support tourism. However, when the Covid-19 Pandemic hit Aceh in particular and Indonesia in general, there are needed an alternative metal production business with other types of product variants, one of which was a ship cast-propeller. Based on this, Mechanical Engineering and FKIP Physics Department of Universitas Syiah Kuala improve the rencong metal casting industry to develop its products, to produce ship propellers through the Higher Education Leading Community Empowerment Program (PPMUPT) funded by the Ministry of Research and Technology /National Research and Innovation Agency of the Republic of Indonesia (RISTEK/ BRIN). The ship propeller product developed from waste metal, it recycled through metal casting technology. So the program and technology developed, is very useful not only for growing the regional economy but also in terms of handling the environment by recycling waste metal. Therefore, the community service program carried out by Mechanical Engineering and FKIP Physics Department of Universitas Syiah Kuala is right on target and in line with expectations.
Effect of rotation on achieving constant voltage in three-phase self-excited induction generator for small scale wind turbines application ahmad syuhada; Ahmad Syuhada; Tarmizi Tarmizi; Akhyar Akhyar
Jurnal Polimesin Vol 22, No 3 (2024): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i3.5279

Abstract

Three-phase Self-Excited Induction Generators (SEIGs) are commonly employed for electricity generation in remote or isolated areas. SEIGs are preferred in such regions due to their ability to create a magnetic field by adding a capacitor to one of their terminals. Nevertheless, a significant challenge in utilizing SEIGs is maintaining a consistent output voltage in the presence of load fluctuations. This study aims to investigate the impact of generator rotation on the SEIG's output voltage and determine the optimal rotation speed required for achieving a stable output voltage. Ensuring stable voltage regulation is crucial to guarantee the proper functioning of all loads connected to the SEIG. Furthermore, operating the SEIG in parallel with other generators is advantageous. The methodology employed in this study involves varying the load supplied by the SEIG at different capacitor values. Unwanted voltage variations occur due to load fluctuations within a generating system or SEIG. Adjustments to the generator's rotation speed are made to uphold a uniform voltage level. The variables considered in this study include the generator's rotation speed, capacitor size, and load fluctuations. Simulation results demonstrate that the SEIG's output voltage is affected by the generator's rotation speed, and maintaining a consistent voltage necessitates appropriate adjustments to capacitor values and generator speed. This research enhances understanding of SEIG characteristics and offers guidance on effective settings for maintaining a stable output voltage at various generator rotation speeds. Future research can focus on practically implementing these findings to enhance the performance of SEIGs in real-world applications
Co-Authors - Khairil - Suyitno Abdillah Imron Nasution Ahmad Farhan Ahmad Syuhada Ahmad Syuhada Ali Mulyagusdin Amir Zaki Mubarak Azwinur Azwinur Iskandar Hasanuddin Jaswir Jaswir Masri Ibrahim Masri Ibrahim Muhammad Tadjuddin Nguyen Huu Tho S.Pd. M Kes I Ketut Sudiana . Suhaeri Suhaeri Syukran Syukran Tarmizi Tarmizi Yopi Ilhamsyah