Jurnal Teknika Akademi Teknologi Warga Surakarta

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Edisi 10, Nomor 2
Judul PENGARUH KUAT ARUS TERHADAP KEKERASAN, STRUKTUR MIKRO DAN LAJU KOROSI LAPISAN CHROMATE COATING PADA LOGAM ALUMINIUM
Penulis

Bambang Hari P 1), Y. Yulianto K 2), Martinus Heru P 3).

1);2);3) Jurusan Teknik Mesin, Akademi Teknologi Warga Surakarta

Abstrak

The objective of this reseach is to find out the influence of currents in the process of chhromate coating on microstructure, hardness and corrosion rate of aluminium (Al). Aluminium is coated with copper (Cu), nickel (Ni) and chromium (Cr) variated with current (60 A, 90 A, and 120 A).

Corrosion rate was tested with three-electrode cell method using 0.3% NaCl solution. Micro Vickers indentation was used for measuring surface hardness with load of 10 grams and an optical microscope is used to observe crosssectional microstructure.

The highest value of surface hardness and the lowest corrosion rate are obtained on specimens of Al/Cu/Ni/Cr with the current 90 A. Increasing current can improve 1,10 mmpy corrosion rate and 571 VHN surface hardness of the specimen. However, the optimum currents is 90 A, if currents is increased again it can increase the corrosion rate and decrease the surface hardness of the specimen. Figures from microstructure observation of the specimen cross-section show tight thin layer on the specimen surface, so this layer can inhibit
corrosion and increase the surface hardness of the specimen.

Key words: Chromate coating, aluminium, corrosion resistance

Paper 10 - 2 PDF
Edisi 10, Nomor 1
Judul KAJIAN PENGARUH VARIASI SETELAN RELIEF VALVE DAN RPM MOTOR PADA PENGEMBANGAN PERFORMA MESIN PRES HIDROLIK 20 TON
Penulis

Joko Yunianto Prihatin 1), Agung Supriyanto 2)

12(Jurusan Teknik Mesin AT Warga Surakarta)

Abstrak

Hydroulic Press Machine 20 ton is one of hydroulic system application which is used to process the pressure periodically in the material that has water content. The optimum performance of hydroulisc system is shown with ability of maximum pressing power and minimum leak debit.

Nowdays, the planning and the operation rely only on valve relief setting, so that people can only get a limited machine performance. With the use of valve relief setting and motor speed, we will get minimum limitation and leak debit. Besides, it is hoped that we will get comparison of significance between the vaiations that will be used as the references in the maintenance system.

The results of the analysis shows that the ability of press power maximum is reached at relief valve setting 3,5 closed rotation and motor speed 1500rpm. (opprtunity 3rd). The leak debit minimum ability is reached at relief valve setting 0,5 closed rotation and motor speed 3000rpm (1st condition).The influence comparison between valve relief is smaller than the influence of speed motor rotation to the machine performance.

Keyword : Hydroulic Press Machine, Press Power, Leak Debit Flowed

Paper 10 - 1 PDF
Edisi 9, Nomor 5
Judul SETING PARAMETER ELECTRICAL DISCHARGE MACHINE UNTUK MENENTUKANKEKASARAN PERMUKAAN DAN LAJU PEMBUANGAN MATERIAL
Penulis Agung Supriyanto 1); Joko Yunianto Prihatin 2). 1),2) Dosen Teknik Mesin Akademi Teknologi Warga
Abstrak

The process of machining EDM (Electrical Discharge Machine) is a non-conventional machining process. In the EDM process, two factors that produced are the material removal rate or material removing rate (MRR) and surface roughness of the material . Research carried out by Taguchi experimental method. EDM machining steel ST60 imposed on the material. If the statistical data obtained from the effect parameter to the response rate of material removal are the interaction time on and time off 35.843%, 35.623% electrode materials, time off 7.902%, 6.135% current, voltage and current interaction 2.943%, 1.827% and the time the voltage on 1.245 %. The parameters that influence the flow of surface roughness is 43.515%, and the interaction of time o time off 15.098%, 14.433% electrode materials, time off 7.495%. Based on the calculation method proposed MSNR obtained optimal parameter settings for a response rate of material removal by an average of 1.750 g / min and average surface roughness of 2.780 μm with current strong parameter settings of 3 amperes, the voltage as high as 250 volts, the time on at 200  s, time off by 40  s, and the type of electrode material is copper (A1B3D3E1G1) with a combination of factors interaction C = A1B3 and F = D3E1.Seting proved successful proposals to improve the response of the surface roughness average of 5.251 μm to an average of 2.780 μm.

Key words: MRR, roughness, EDM, current, voltage, time on, time off.

Paper 9 - 5 PDF
Edisi 9, Nomor 4
Judul Perancangan Dan Implementasi Pengukuran Sensor Kadar Lengas Model Gypsum Block Untuk Pemantauan Simulasi Longsoran
Penulis Agung Prasetyo 1) Eka Firmansyah 2) Sunardi Goenawan 3). 1) Jurusan Teknik Elektro , 2)3) Teknologi Informasi FT UGM Jalan Grafika 2, Yogyakarta
Abstrak

Shifts / avalanche occurs when the balance of the rocks, soil, rocks or debris moving down the slope and down that caused by gravity. The term landslide covers a wide range of ground movement such as rockfall, mud and rock debris fell or flowed or had silde transitions that may occur at any time. One of the factors behind the shift/landslide is the level of water in irrigated rice farming area slopes excessive. The occurance of a shift /avalanche can be detected by monitoring the level of water in land.

Wireless sensor network (WSN) or wireless sensor network technology has the ability to censor the content of water (moisture), temperature sensors, processing, and transmission of critical data in real-time. This study discusses the design and implementation of wireless sensor network to monitor in real time that need to collect data and network requirements landslide detection system on sloping land farming areas. The results of these measurements will be stored in a database shown on a webserver and visualization of data that later it can be
analyzed for further development as an early warning of the shift / avalanche.

Keywords - Landslide, Wireless Sensor Network, Real-time.

Paper 9 - 4 PDF
Edisi 9, Nomor 3
Judul OPTIMALISASI PENGGUNAAN REPEATER SEBAGAI ALAT PENGHUBUNG RADIO KOMUNIKASI
Penulis Aris Teguh Rahayu 1), Suharjanto 2). 1)2) Jurusan Teknik Elektro Akademi Teknologi Warga Surakarta
Abstrak

Repeaters is a communication devicet. Inorder to work property, repeater should be located on the hills, mountains or high buildings.By using frequency duplex system,it is expected that the output and the input of the repeater are not mutually disturbed. In the tes result, the frequency of 156,480 MHz, Repeater has output power of 45 watts with the value of SWR. SWR value of 1 means there is no revers power. While the frequency of 150.003 MHZ as the input,itis not affected by output power. In response to the signal emitted by repeater device, itis well received by the receiver event hough it we potable device.

Key words: Repeater, SWR, Power output

Paper 9 - 3 PDF