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Optimasi Holding Time Untuk Mendapatkan Kekerasan Baja S 45 C Widodo, Edi; Huda, Miftahul
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 1, No 1 (2016): June 2016
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v1i1.167

Abstract

Baja S 45 C  merupakan bahan yang banyak dipakai menjadi berbagai bagian komponen mesin. Dengan luasnya penggunaan bahan, diperlukan karakter sesuai untuk mendapatkan fungsi maksimal dalam berbagai aplikasi perkakas. Perlakuan heat treatment yang tepat merupakan langkah dalam mendapatkan sifat mekanik yang diinginkan. Langkah penelitian, bahan specimen S 45 C diuji dan dipanaskan dengan temperature 850 0. Selanjutnya pendinginan cepat dengan media Oli SAE 90 pada wadah terbuka. Parameter waktu pendidinginan dilakukan untuk mendapatkan hasil yang berbeda dari nilai kekerasan yang diperoleh. Kekerasan bahan dicatat dengan alat uji kekerasan Brinell test. Dari hasil penelitian, grafik rata-rata hasil uji menunjukkan bahwa nilai kekerasan mulai berkurang dari holding time 10 menit, kemudian holding time 20 menit, dan kekerasan tertinggi diperoleh pada holding time 30 menit. Hal ini disebabkan pada waktu holding yang pendek pembentukan martensit terjadi belum sempurna. Disebabkan penurunan suhu terpotong pada menit ke sepuluh. Pada holding yang paling lama yaitu 30 menit memberikan waktu yang cukup dalam pembentukan struktur Kristal yang seragam dan lebih teratur.
Analisa Pengaruh Variasi Diameter Pipa Tekan PVC Pada Pompa Rotari Untuk Kecepatan Gaya Dorong Air Pradhana, Rega Yuan; Widodo, Edi
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 2, No 1 (2017): June 2017
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v2i1.846

Abstract

This research is aimed to analyze the effects of the PVC rotary pipe’s diameter to the velocity of the viscous forces. The diameter of the PVC rotary pipe used in this research are (1 ½”, 1”, ¾”, ½” inch). The procedure of this reasearch is begin with designing the pipe’s installation, then continued with the pipe installation, then continued with data recording. After the data is collected from the experiment, analyzing the data is needed. Also, calculate if there’s any effects of the velocity of the viscous forces due to the changing of the dependent variables (which is the diameter of the PVC rotary pipe). In the process of the fluid conduction inside the pipe, head losses are usually happened. The manual calculation needed to complete the research are, surface area calculation, fluid velocity calculation, reynold number calculation and coeff. Losses calculation. After all of the calculation are collected, the result of the research will be obtained. After that, discussion and conclusion can be produced.
Karakterisasi Laju Korosi Baja ST 40 Berlapis Polyester Putty Dalam Lingkungan Air Payau Anwar, Muhammad Jamaluddin; Widodo, Edi
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 2, No 2 (2017): Desember 2017
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v2i2.951

Abstract

The attack caused damage of corrosion (rust) is the general problem that causes the degradation of the material as the interaction with the environment and shorten the lifetime of material. Steel ST 40 is a common material used in the industrial, shipping, engineering products, home wares and others. Prevent the occurrence of direct contact with the outside environment by using a coating of polyester putty, serves to prevent the occurrence of oxidation reactions of the nature of corrosion. Coating using polyester putty give influence on the material test of resistance to corrosion. The missing mass on the specimen using a coating of polyester putty of mass loss reached 2,090 mg. whereas in the specimen undergoes the smallest mass loss of 1,090 mg. Whereas in the material without upholstery polyester putty of mass lost most of the specimens that do not use coating polyester putty with the missing mass reach 4,390 mg. Whereas in the specimen menggalami the smallest mass loss of 3,560 mg. On the specimen that is experiencing the highest rate of corrosion occurred in unpublished material using polyester putty of 26.11 Mpy whereas the smallest lajukorosi reached 21.52 Mpy. While the biggest missing mass on a material without polyester putty of 0.98 Mpy, the rate of corrosion of the smallest reach 0.56 Mpy.
Analisa Laju Pelapisan Chromming Terhadap Corrosion Rate Baja ST 40 Widodo, Edi
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 1, No 2 (2016): December 2016
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v1i2.378

Abstract

Korosi pada logam mengakibatkan penurunan mutu bahan logam, akibat reaksi elektrokimia antara permukaan logam dengan lingkungan sekitarnya.Baja ST 40 merupakan logam yang umum dipakai dalam industri dan peralatan rumah tangga. Pelapisan khrom secara elektroplating pada bahan ini dapat meningkatkan kekerasan dan mencegah terjadinya kontak langsung material dengan lingkungan luar, dengan demikian reaksi oksidasi penyebab korosi dapat dihindari. Laju pelapisan memberikan pengaruh terhadap kualitas permukaan logam, meliputi kekerasan dan ketahanan terhadap korosi. Laju pelapisan dengan khrom diukur dengan parameter perubahan suhu dan arus selama proses elektroplating. Spesimen dari masing parameter memberikan rata-rata laju pelapisan. Laju pelapisan tertinggi dicatat pada kondisi pelapisan selama 10 menit dengan rata-rata laju pelapisan dari tiga spesimen sebesar 5,3 gram. Sedangkan laju terendah pada pelapisan selama 25 menit dengan rata-rata laju pelapisan sebesar 2,5 gram. Laju korosi logam baja ST 40 diperoleh nilai terbesar pada spesimen dengan waktu pelapisan 5 menit, sebesar 235,37 mpy. Sedangkan laju korosi terendah pada spesimen ke dengan lama pelapisan 20 menit sebesar 50,02 mpy.
Pengaruh Jenis Bahan Bakar Terhadap Viskositas dan TBN Pelumas SAE10W-30 pada Motor Bakar 125cc Yuliyanto, Dwi; Widodo, Edi
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 3, No 1 (2018): June 2018
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v3i1.1541

Abstract

Along with the increasing progress of gasoline type of fuel led to many types of gasoline fuel sold in Indonesia to meet consumer demand required for fuel energy motor fuel. Includes Premium fuel types, Pertalite, Pertamax, Pertamax Turbo, and Pertamax Racing. Therefore, with the number of options are conducted research on the use of 3 different types of fuel are: Premium, Pertalite, and Pertamax tested on a 125cc motor fuel engine for 7 hours nonstop at 4000 rpm speed to know the effect on the difference in decrease in value of Viscosity and TBN SAE10W-30 lubricating oil used on the combustion engine. Given the function Lubricant oil is also very important in maintaining the durability and performance of the engine. The results show that the use of Pertamax fuel has the highest decrease in Viscosity and TBN value compared to Pertalite and Premium fuels. Where each value of Viscosity and TBN on the sample of Pertamax lubricant 9.7 cSt and 6.9 mg KOH / g. Pertalite 9.8 cSt and 7.1 mg KOH / g. Premium 7.2 cSt and 10 mg KOH / g.
REKAYASA SLIDING SEAT PADA POMPA OBSERVASI UNTUK EFEKTIFITAS LABORATORIUM Widodo, Edi; Priyambudi, Gagah Deffi
TURBO [Tulisan Riset Berbasis Online] Vol 7, No 1 (2018): Juni 2018
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v7i1.678

Abstract

Salah satu yang menentukan hasil proses pembelajaran dan proses penelitian pada perkuliahan adalah kelengkapan sarana dan prasarana. Pengembangan alat pengujian dalam laboratorium diperlukan dalam mendukung kemajuan teknologi. Diantaranya adalah perancangan sliding seat pada alat uji pompa sentrifugal. Dua pompa yang disusun salah satunya dapat digeser dengan sliding seat untuk arah pergeseran sumbu x dan menggunakan ulir daya untuk memindahkan posisi dalam arah sumbu y. Untuk rekayasa sliding seat dalam penelitian ini di perlukan komponen pendukung yaitu : bearing (sebagai pengganti roda), ulir daya (sebagai media perpindahan posisi  pompa) dan rel besi hollow (sebagai lintasan bearing). Sliding seat ini berfungsi untuk memindahkan posisi rangkaian pompa sentrifugal yang dapat dioperasikan secara susunan seri dan paralel, dilengkapi dengan pengunci untuk menjaga kedudukan pompa agar tetap stabil ketika dioperasikan. Asumsi pompa yang digunakan sebagai objek penelitian merupakan pompa, dengan memiliki massa 80 kilogram. Hasil perancangan dan perhitungan bearing dengan kode 6203 dapat berputar sebanyak 474,5 juta putaran dengan keandalan 90% dan dibutuhkan torsi sebesar 503 Nm untuk memutar ulir daya dengan beban 80 kilogram atau setara dengan 784 N, serta nilai gaya gesek statis (fs)  yang bekerja pada rel besi hollow sebesar 117 N, sedangkan nilai gaya gesek kinetis (fk) yaitu sebesar 54,8 N. Untuk asumsi Durasi rentang waktu keseluruhan proses yang di butuhkan untuk mengubah posisi pompa dari rangkaian paralel menjadi rangkaian seri atau sebalik nya yaitu 8,5 menit.
APLIKASI SISTEM PENDUKUNG KEPUTUSAN UNTUK MENENTUKAN HARGA LAYANAN TEKNOLOGI INFORMASI Widodo, Edi; Mustafid, Mustafid; Widiyanto, Ibnu
JSINBIS (Jurnal Sistem Informasi Bisnis) Vol 4, No 3 (2014): Volume 4 Nomor 3 Tahun 2014
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (589.726 KB) | DOI: 10.21456/vol4iss3pp194-204

Abstract

The effects of recency of information technology (IT) will be invested impaired, this makes it difficult to assess the information technology investment. This study intend to calculate the production cost of IT services with the activity based costing system method, to assess IT investments. This study make the position of IT department as an independent business that sells services to other departments within the organization (IT as a service - ITaaS). To assess the IT investment carried out in 3 stages, 1) Do departmentalize overhead, 2) Calculate the production cost of IT services,3) Perform investment analysis using cash flow simulation with the net present value method. The result of this study is decision support system information to assist management in determining the implementation of IT investments, to do their own (in-house) or purchased from an outside party (outsourced). In this way, losses due to errors in executing IT investments can be avoided, because the analysis is done prior IT investments held.   Keywords: IT Investment; Net Present Value (NPV); Activity-Based Costing system (ABC);Value chain; IT as a Service (ITaaS)
Analysis on Centrifugal Pump Performance in Single, Serial, and Parallel Ansori, Faisal; Widodo, Edi
Journal of Energy, Mechanical, Material and Manufacturing Engineering Vol 3, No 2 (2018)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1063.401 KB) | DOI: 10.22219/jemmme.v3i2.6958

Abstract

The pump is a tool to provide the mechanical energy to the liquid in the pump constant fluid density and large. In terms of mechanism, the pump is divided into three types, namely, rotary pumps, pump the shaft/piston and centrifugal pumps. The use of the pump are the most widely used either in the household or in the environment industry. In the centrifugal pumps, there are losses – losses among other head losses. To find the head losses among other data needs head on the pump, the pump and the discharge flow rate of the pump. Head is defined as energy per unit weight of the fluid. The head of the unit (H) meters or feet is fluid. In the pump, the head is measured by calculating the difference between the total pressure of the suction pipe and the pipe press, when measurement is done at the same height. For single full pump openings 0,00246 m³ \ s, valve openings ¾ 0,00210 and aperture of ½ 0,00177 m³ \ s can be concluded the discharge of water at the pump the larger the opening of the valve the greater the discharge of its water. Moreover, vice versa, if the opening of the valve is getting smaller then the water debit is getting smaller. For full opening valves 3,11 m / s, for openings ¾ 2,65 m / s and ½ 2,23 m / s open valve openings. For the flow, velocity can be concluded the greater the opening of the valve the flow velocity is smaller and vice versa the smaller the opening of the valve the greater the flow rate. single centrifugal pump full valve openings 0.409 kg / cm², the opening of the valve ¾ 0,209 kg / cm² and the opening of the valve ½ 00,069 kg / cm² can be concluded the smaller the opening of the opening valve the smaller the head as well, and the greater the open valve opening, the more big head also in the can.
IMPLEMENTASI PROFILE MATCHING UNTUK PEMBERIAN KREDIT KEDUA PADA KOPERASI SIMPAN PINJAM Pinem, Agusta Praba Ristadi; Pungkasanti, Prind Triajeng; Widodo, Edi
Simetris: Jurnal Teknik Mesin, Elektro dan Ilmu Komputer Vol 8, No 2 (2017): JURNAL SIMETRIS VOLUME 8 NO 2 TAHUN 2017
Publisher : Universitas Muria Kudus

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (356.395 KB) | DOI: 10.24176/simet.v8i2.1366

Abstract

Sistem Pendukung Keputusan (SPK) atau Decision Support System (DSS) merupakan suatu pendekatan (atau metodologi) untuk mendukung pengambilan keputusan. SPK menerapkan metode algoritma dalam penyelesaian masalah. Ada beberapa metode algoritma yang dapat digunakan dalam penyelesaian masalah, salah satunya adalah metode profil matching (GAP). Profil matching adalah sebuah mekanisme pengambilan keputusan dengan mengasumsikan bahwa terdapat tingkat variabel prediktor yang ideal yang harus dipenuhi oleh subyek yang diteliti, bukannya tingkat minimal yang harus dipenuhi atau dilewati. SPK dapat diterapkan dalam berbagai macam bidang, salah satunya adalah bidang koperasi. Salah satu proses bisnis pada koperasi yaitu pemberian kredti bagi nasabah. Berdasarkan profil nasabah pihak koperasi dapat mengabulkan dan bahkan menolak permintaan kredit oleh nasabah. Penelitian ini fokus pada proses pengajuan kredit kedua yang dilakukan nasabah yang sebelumnya pernah mengajukan kredit dan disetujui oleh pihak koperasi.
Analisa Kinerja Aliran Fluida dalam Rangkaian Seri dan Paralel dengan Penambahan Tube Bundle pada Pompa Sentrifugal Saleh, Muhammad Marzuky; Widodo, Edi
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 3, No 2 (2018): Desember 2018
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v3i2.1884

Abstract

Pump is a device used to move fluid from one place to another through the pipe media as a channel. The pump has 2 important components in its performance, namely: Impeller and pump house (casing). When the pump cannot meet the required capacity it can use series and parallel pump circuits to increase it. When moving the fluid to a high surface or high pressure it will have the specifications of the head and discharge. Fluid flow is a liquid that flows in a pipe. In flow there is fluid pressure and also flow type. There are 3 flow types, namely laminer, transition, turbulent. To reduce turbulence in the flow can be used Tube bundle which is a device consisting of several pipes that are tied together that are attached to a cross section in the pipe. This research was conducted in 4 testing stages, namely series circuit with additional tube bundle, series circuit without additional tube bundle, parallel circuit with additional tube bundle, parallel circuit without additional tube bundle. Each test takes fluid pressure, discharge, flow type. From the results of this study it was found that the parallel circuit pump with an additional tube bundle produces fluid pressure, discharge, flow velocity smaller than the series circuit, whereas when without additional the parallel tube pump bundle produces a fluid pressure, discharge, flow velocity greater than the circuit series, while for the flow type of this study is turbulent flow.