Articles

ANALISA KEAUSAN DISC BESI COR DENGAN METODE MATEMATIKA SEDERHANA MENGGUNAKAN TRIBOMETER PIN-ON-DISC TANPA PELUMAS

JURNAL ILMIAH MOMENTUM Vol 15, No 1 (2019)
Publisher : Universitas Wahid Hasyim

Show Abstract | Original Source | Check in Google Scholar

Abstract

Semakin maju dan berkembangnya ilmu pengetahuan dan teknologi di bidang mechanical engineering khususnya di bidang tribologi, maka akan semakin banyak terungkap faktor-faktor yang dapat mempengaruhi umur pemakaian  komponen dari sebuah mesin. Besi cor adalah salah satu bahan untuk membuat komponen dari suatu mesin. Penelitian kali ini menggunakan tribometer pin-on-disc dengan besi cor A (79.5 HRB), besi cor B (82 HRB) dan besi cor A (86.5 HRB) sebagai disc dan bola baja AISI 52100 berdiameter 8,0 mm dengan kekerasan 60 HRC sebagai pin. Penelitian ini bertujuan untuk mengetahui pengaruh penggunaan material disc dan ukuran diameter pin terhadap nilai lebar kontak keausan, koefisien keausan berdimensi, volume dan tinggi keausan yang terjadi pada besi cor. Kajian juga membandingkan hasil keausan dengan berbagai model yang yang telah ada sebelumnya. Analisa perhitungan menggunakan penurunan geometri berdasarkan rumus matematika dasar sederhana dan menggunakan metode penurunan persamaan Archard. Hasil penelitian menunjukkan bahwa lebar kontak keausan, koefisien keausan berdimensi (KD), ketinggian keausan (h) dan volume keausan (V) mempunyai hubungan berbalik nilai dengan kekerasan material dan senilai dengan jarak sliding (s). Ukuran diameter pin mempunyai hubungan sebanding dengan lebar kontak aus, koefisien keausan berdimensi (KD), ketinggian keausan (h) dan volume keausan (V). Semakin keras suatu material maka keausan yang terjadi akan semakin kecil.Kata kunci: keausan, besi cor, pin-on-disc, Archard, metode sederhana

KAJIAN FOCUS GROUP DISCUSSION (FGD) DALAM MITIGASI BENCANA TSUNAMI DI DESA PONCOSARI

Civil Engineering Forum Teknik Sipil Vol 18, No 2 (2008): MEI 2008
Publisher : Civil Engineering Forum Teknik Sipil

Show Abstract | Original Source | Check in Google Scholar | Full PDF (858.542 KB)

Abstract

Disaster mitigation require to be supported by information and data regarding the condition of local society characteristic and area. The available of correct information and data, expected can maximize usage of local resource, including labour, organization and material. One of the partisipative data collecting method able to be used to dig catastrophic society perception and understanding of tsunami is Focus Group Discussion ( FGD). Participant one of the important element in FGD, so that participant composition can influence attainment result of FGD. This research aim to know society characteristic and condition to formulate FGD participant criterion and composition in tsunami disaster mitigation. This Research type is descriptive research with approach qualitative, while primary data collecting use partisipative observation technique where researcher follow to involve and at the same time perceive FGD simulation execution. Discussant which uppermost enough is them owning catastrophic understanding and knowledge of tsunami nature, where this matter is influenced life experience or relate to its work responsibility. Several things which need to be paid attention in chosening and determining discussant: 1) education and age vary to start from student age until the old man with mean 35 year, 2) do not predominate by age, certain work or education, 3) if education of [him/ it] lower to be expected to have experience which enough or which is its old age, 4) entangling woman participant owning catastrophic understanding and knowledge of tsunami, 5) having work or got mixed up with interconnected activity or relate to natural disaster handling.

PENGEMBANGAN METODE PENGECORAN SQUEEZE UNTUK MENINGKATKAN KUALITAS SEPATU KAMPAS REM KENDARAAN BERMOTOR BERBAHAN ALUMUINUM DAUR ULANG

Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Vol 1, No 1 (2013): PROSIDING SEMINAR NASIONAL SAINS DAN TEKNOLOGI 4 2013
Publisher : Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik

Show Abstract | Original Source | Check in Google Scholar

Abstract

Sepatu kampas rem merupakan salah satu  komponen  kendaraan bermotor yang umur pemakaiannya relatif pendek. Karateristik fisis dan mekanis diperlukan pada sepatu kampas rem yang berbahan aluminium dalam proses pengecoran dan produksinya. Tujuan dari penelitian ini adalah mendisain dan membuat proses pengecoran squeeze dalam produksi sepatu kampas rem dan  mengetahui perbedaan kualitas produksi menggunakan pengecoran squeeze berbahan aluminium daur ulang dengan produk yang beredar dipasaran terhadap struktur mikro dan kekerasan. Paduan di tuang pada temperatur 600 dan 700 oC pada cetakan yang dipanaskan pada temperatur 400oC dan ditekan pada tekanan 125,71 MPa.  Hasil menunjukan bahwa  produksi sepatu kampas rem dapat dibuat secara sederhana dengan menggunakan sistem pengecoran squeeze dan metode ini dapat menghasilkan coran  dengan sedikit porositas  yaitu pada tekanan 125,71 MPa porositas  rata-ratanya adalah 2,04% dan  kekerasan pada  temperatur tuang 600oC sebesar 72,80 BHN,   pada temperatur tuang 700oC adalah 68,53 BH, sedangkan sepatu kampas rem yang beredar di pasaran mempunyai porositas 14,66% dengan kekerasan 90,90 BHN. Sehingga metode ini dapat digunakan oleh industri kecil pengecoran daur ulang untuk membuat sepatu kampas rem.  Kata kunci : sepatu kampas rem, squeeze, industri kecil, alumunium daur ulang

PENGEMBANGAN MEKANISME DAN KUALITAS PRODUKSI SEPATU KAMPAS REM BERBAHAN ALUMUNIUM DAUR ULANG DENGAN METODE PENGECORAN SQUEEZE

Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Vol 1, No 1 (2014): PROSIDING SEMINAR NASIONAL SAINS DAN TEKNOLOGI 5 2014
Publisher : Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik

Show Abstract | Original Source | Check in Google Scholar

Abstract

Sepatu kampas rem merupakan salah satu komponen kendaraan bermotor yang diproduksi melalui proses pengecoran umur pemakaiannya relatif pendek dan dapat mengalami kegagalan. Pengembangan mekanisme pengecoran dilakukan dengan menggunakan sistem hidrolis dua arah untuk sistem penutupan dan pembukaan cetakan maupun pengeluaran coran dari dalam cetakan. Temperatur cetakan dan tekanan squeeze divariasikan untuk mendapatkan kapasitas produksi, spesimen metalografi dan kekerasan dari bahan paduan alumunium silikon daur ulang. Pengamatan dan analisa hasil penelitian menunjukkan mekanisme yang dikembangkan dapat bekerja secara optimal mulai dari penutupan cetakan, pembukaan cetakan dan pelepasan coran dapat dilakukan secara otomatis dengan menggunakan sistem hidrolis. Kecepatan produksi sangat tergantung dari pemanasan cetakan, semakin panas cetakan yang diberikan semakin rendah kecepatan produksi. Pada temperatur cetakan lebih tinggi jumlah porositas menurun, SDAS semakin halus, kekerasan menurun. Penambahanm tekanan squeeze menghasilkan porositas menurun, SDAS semakin halus dan kekerasan meningkat. Kata kunci: mekanisme pengecoran squeeze, alumunium daur ulang, sifat fisis dan mekanis

Analisis Thermal Fatigue pada Nozzle Bejana Tekan Tipe Crack Gas Drier

Rekayasa Mesin Vol 4, No 2 (2013)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Original Source | Check in Google Scholar

Abstract

One of the most critical component in a pressure vessel is the nozzle because it is very sensitive to thermal fatigue. The fatigue life of a top head nozzle of crack gas drier is calculted based on ASME NB—3216.1 module during fluctuative temperature cycle. The life of ten locations at the nozzle are caculated using two dimensions axisymmetric model. ABAQUS and ANSYS are used to analyze thermal fatigue. The life calculation result of the ten locations is infinite.Keywords: nozzle, thermal fatigue, ASME

Analisis Thermal Fatigue pada Nosel Bejana Tekan Tipe Crack Gas Drier

Rekayasa Mesin Vol 4, No 2 (2013)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Original Source | Check in Google Scholar

Abstract

Nozzle is one of the most critical component in a pressure vessel because of its sensitivity to thermal fatigue. The fatigue life of a top head nozzle of crack gas drier is calculted based on ASME NB—3216.1 module during fluctuative temperature cycle. The life of ten locations at the nozzle are caculated using two dimensions axisymmetric model. ABAQUS and ANSYS are used to analyze thermal fatigue. The life calculation result of the ten locations is infinite.Keywords : nozzle, thermal fatigue, ASME

ANALISA PERHITUNGAN GAYA - GAYA MEKANIS PADA PEMBUATAN KOMPONEN OTOMOTIF BRAKET UPPER ARM

MESIN TEKNOLOGI Vol 8, No 2 (2014): SINTEK JURNAL
Publisher : MESIN TEKNOLOGI

Show Abstract | Original Source | Check in Google Scholar

Abstract

Braket upper arm adalah salah satu bagian dari sistem peredam getaran (suspensi) pada kendaraan yang terpasang pada rear axle yang berfungsi menyangga pegas koil, tempat dudukan steering knuckle dan memelihara letak geometris bodi dan roda-roda. Braket upper arm terbuat dari sheet metal SAPH 440 yang mempunyai kuat tarik 45 kgm/mm2,resistansi gesek 36 kgm/mm2 dan ketebalan material 2,9 mm. Untuk metode perhitungannya menggunakan pedoman Press Dies Design, dari IMDIA. Disain produk mengikuti permintaan dari pelanggan dan untuk mengurangi scrap yang terbuang dihitung ulang layoutnya yaitu perkalian antara tebal material 2,9 mm lebar produk, jarak antar material blank 2,9 mm dan jarak lebar blank ke tepi 6,65 mm. Untuk mendapatakan potongan dengan burry yang minimal clearen punch dan die diatur sebesar 0,2175 mm dengan gaya potong yang perlukan mesin press sebesar 135 tonf, gaya proses drawing 18,5 tonf, proses bending memerlukan di pelukan gaya dari mesin press dengan tonase 4 tonf dan untuk prroses triming menggunakan mekanisme dua buah cam  dengan total gaya yang di pelukan untuuk proses triming yaitu 44,5 tonf Kata Kunci : kuat tarik dan resistansi gesek SAPH 440, blank layout, gaya blanking, gaya drawing, gaya bending dan gaya cam. 

COMPEREHENSIVE TECHNICAL STUDIES OF FLOOD CONTROL OVER SOLO CITY AREA (CASE STUDY IN DEMANGAN BARRAGE)

Journal of the Civil Engineering Forum VOLUME: XXII/3 - SEPTEMBER 2013
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Show Abstract | Original Source | Check in Google Scholar

Abstract

City of Surakarta, known as Solo City is one of cities in Central Java Province traversed by Bengawan Solo River. Heavy rainfall in upstream area of Bengawan Solo River causes increase in high water level at downstream. Bengawan Solo River will be higher than water level in drainage system which may induce a backwater flow. Since Colonization era, the government has built dikes and barrages against backwater flow and inundation problem. One of the barrages was Demangan Barrage dividing river flow into Bengawan Solo River and Pepe River. It was equipped with total capacity pump of 12,3 m3/s. The inundation is not only caused by the backwater flow coming from Bengawan Solo River, but also surface runoff as the result of the excess rainfall which cannot be drained gravitationally to the main river if the gate was closed. Therefore, comprehensive study combining hydrology and hydraulics analysis is highly needed in order to achieve more effective flood control management.Hydrology analysis was done to estimate the direct runoff hydrograph from catchment area in Solo City to downstream of Pepe River. While in hydraulics case, hydraulic parameter in downstream of Pepe River influenced by Bengawan Solo River stream was analyzed. Both studies were simulated using software HEC-RAS 4.1.0 version. The simulation considered drainage channel, gate, pump system and dike in Pepe River downstream.Simulation using 10 years of return period in Solo City and average annual water level in Bengawan Solo River showed that Pepe River can flow through the gate, while the highest water level is still below the dike. Simulation considering 10 years of return period, water level hydrograph of Bengawan Solo River, existing pump, and gate operation inferred that Pepe River surpassed top of dike. Capacity of required pump should be more than 168,3 m3/s in order to pass 10 years of return period. By combining operational of existing pump and dike elevated up to +87,63 m, capacity of required pump became lesser which was approximately 120,3 m3/s. Simulation of HEC-RAS conducted by operating pump automatically on critical elevation without heightened dike obtained the total capacity of pump was 132,3 m3/s.Keywords: barrage, pump operation, Bengawan Solo River, flood control management.

A STUDY OF CAPABILITY AND WILLINGNESS OF LOCAL SOCIETY TO FUND THE OPERATIONAL AND MAINTANANCE OF POLDER IN BANGER RIVER SEMARANG

Journal of the Civil Engineering Forum VOLUME: XXIII/1 - JANUARY 2014
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Show Abstract | Original Source | Check in Google Scholar

Abstract

East Semarang District deals with a very serious problem for flood and robs threat. Rob is caused by high tide in the sea, while flooding caused by heavy rainfall. Banger River conveys run off flow from East Semarang District to the sea. Banger Polder System comprises dike surrounding Banger Polder and also dam aimed to protect it from rob attack, pump Station to control the water level, and retention pond used also as fishpond. To maintain urban polder management and flood protection system, society participation is highly. The purpose of this research was to determine the willingness and capability of communities to pay the operational and maintenance of polder system. Research focused on Banger Polder Area located at 10 Sub Districts in East Semarang District with the scope of discussion is to assess the society willingness-capability to pay the operational and maintenance of polder system. Primary data were collected by Contingent Valuation (CV) sample survey method using closed ended referendum elicitation format (Bidding game format), or closed questions by providing an alternative of answers choice. Society willingness in funding the operational and maintenance of polder can be determined by maximal costs that have been paid by society required to cope with flood and inundation problem in Semarang District. Society capability in funding polder operational and maintenance can be showed as a relation between total income and maximal capability of society in funding polder operational and maintenance. Result of data analysis showed that 87% society is categorized as capable society, and 12.67% society is incapable in funding polder operational maintenance. Result of data analysis showed that 81.33% society having the willingness, and 18.67% as the rest in paying the operational and maintenance of polder. Percentage of society which has the willingness and capability is approximately 72%. Income, building and land asset were used as decision variable in estimating participatory rates, fair, equitable, and independent which is expected to be sustained.Keywords: Social willingness, social capability, polder operational and maintenance costs.

MENGENAL PELUMAS PADA MESIN

MOMENTUM Vol 7, No 1 (2011)
Publisher : MOMENTUM

Show Abstract | Original Source | Check in Google Scholar

Abstract

Kontak mekanik adalah hal yang tidak bisa dihindari pada permesinan, meminimalkan keusan akibat kontak adalah dengan cara memberi pelumas pada sistem tersebut. Cara memilih pelumas pada mesin harus mempertimbangkan tiga hal pokok, yaitu putaran mesin, tekanan kontak atau beban dan temperatur kerja. Indek Viskositas pelumas menunjukkan kerja pelumas yang sangat dipengaruhi oleh temperatur kerja. Kekentalan atau viskositas pelumas mempengaruhi koefisien gesek permukaan kontak, sehingga mempengaruhi regim pelumasan. Kata Kunci : kontak mekanik, pelumas mesin