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All Journal Rekayasa Mesin Journal of Engineering and Management in Industrial System Journal of Environmental Engineering and Sustainable Technology FLYWHEEL : Jurnal Teknik Mesin Untirta ROTOR: JURNAL ILMIAH TEKNIK MESIN

widya wijayanti

Staf Pengajar Jurusan Teknik Mesin Fakultas Teknik Universitas Brawijaya

Author-ID : 3301132

Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Decision Sciences, Operations Research & Management Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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Articles

PENDEKATAN LEAN SIX SIGMA, FMEA-AHP UNTUK MENGIDENTIFIKASI PENYEBAB CACAT PADA PRODUK SANDAL DI PT. “X” Moh. Muhyidin Agus Wibowo; Pratikto Pratikto; widya wijayanti
Journal of Engineering and Management in Industrial System Vol 4, No 2 (2016)
Publisher : Badan Penerbit Jurnal, Faculty of Engineering, Universitas Brawijaya

Abstract Quality is one of problems commonly happen in production. It can be vary and affect the level of product quality and service. Improving quality is needed to keep a good quality of a product. X Inc is one of a company focus on making slipper. The problem is facing by the company is that the method use to decrease the defect and waste is not effective yet. Based on the problem above, a researcher conduct a research and basic concept development lean six sigma to improve the quality by integrating FMEA and AHP in identifying the product defect. It is hoped that the X inc. can keep or maintain and improve the quality in order to fulfill the costumer`s need. Based on the result of FMEA-AHP computation, it is found that IR result is 0,0745. It means that the data is consistent. While priority FMEA-AHP computation for each criteria will be used as reference in making or taking decision. Keywords : lean six sigma approachment, FMEA-AHP, defect, slipper.

THE EFFECT OF CRYSTALLIZER ROTATION ON THE GAS HYDRATE PERFORMANCES Widya Wijayanti; Mega Nur Sasongko; Nurkholis Hamidy; Purnami Purnami
Journal of Environmental Engineering and Sustainable Technology Vol 4, No 1 (2017)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Brawijaya

The performance of hydrate was shown by the hydrate formation rate, the hydrate stability, and the storage capacity. In the study, we investigated the hydrate performance by influencing the rotation of crystallizer that predicted to increase the agitation of the hydrate performance. The hydrate represent the bond of water molecules and gas absorbed by the water molecules. In the experiment, we used the 50% propane and 50% butane as the gas absorbed. The gas was injected in a crystallizer at 3 bar pressure, then the crystallizer was rotated by 100, 200, and 300 rpm. The results shows that the best performances of hydrate when the crystallizer was rotated at 300 rpm. The crystallizer rotation speed of 300 rpm had the highest the formation rate and the decomposition rate. The highest decomposition rate indicated the highest stability. Meanwhile, the highest hydrate storage capacity was also occured at the rotation of 300 rpm as 2809 V / V.

PENINGKATAN PERFORMANCE SYSTEM PADA DEPARTEMEN PACKAGING DENGAN SIMULASI PROSES DAN REDESIGN WORKSTATION (Studi Kasus : CV. Segar Buah Hutama, Batu) Nuzullis Lailatul Kamaliyah; Sugiono Sugiono; Widya Wijayanti
Journal of Engineering and Management in Industrial System Vol 3, No 1 (2015)
Publisher : Badan Penerbit Jurnal, Faculty of Engineering, Universitas Brawijaya

Abstract In running the process, the repetitive activity in the production process of the extract of Dewata fruit could cause pain and fatigue on the worker's body. It was because there was a facility that did not meet the rules of workplace ergonomics. Continuous evaluation was needed to know the solution of the problem of musculoskeletal complaint so that it can improve ergonomic working facilities. In making simulation scenario is expected to describe the condition of the actual company so that the improvement proposal can resolve the real issue.The methods that were used in this study include: Biomechanics Assessment (REBA and QEC), anthropometric Design and Simulation Arena. Assessment scores REBA (Rapid Entire Body Assessment) was obtained from the angle of motion depiction of the image carrier (photo) whereas the assessment scores QEC (Quick Exposure Check) was obtained from filling the questionnaire between the observer and the operator. From the research result on the dimension repair facility cooling pond work on workstation 2 (cooling), tables and chairs on the workstation 3 (formation of cardboard box), and the table packaging on the workstation 4 (packaging). In the proposal of improved simulation, it is given resource addition as many as one person on cooling 2 to improve production efficiency from 42.3 % to 100 % so that it is necessary to increase the wage of Rp 1,500,000.00 / month.

VALIDASI PERFORMANCE GAS HIDRAT PADA VARIASI TEMPERATUR COOLING BATH DI TEKANAN 0.4 MPa Widya Wijayanti
FLYWHEEL : Jurnal Teknik Mesin Untirta Volume IV Nomor 2, Oktober 2018
Publisher : Universitas Sultan Ageng Tirtayasa

Natural Gas Hydrate (NGH) merupakan campuran antara gas alam dan air yang terbentuk pada tekanan tinggi dan suhu mendekati titik beku air. Secara fisik, hidrat berbentuk es dan didalamnya terdapat rongga yang diisi oleh gas penyusun hidrat yang disebut dengan klarat. Hidrat dapat terbentuk karena terdapat gas dan air yang memiliki tekanan tinggi dan berada pada suhu di atas titik beku air, kemudian terkena gaya yang dapat melarutkan gas alam di dalam air. Sudah banyak penelitian yang telah dilakukan untuk melihat karakteristik dari gas hidrat itu sendiri. Salah satunya adalah pengaruh variasi temperatur cooling bath terhadap karakteristik gas hidrat campuran propana butana. Karakteristik ini meliputi laju pembentukan, stabilitas hidrat dan kapasitas penyimpanan hidrat. Pengaruh variasi temperatur cooling bath akan mempengaruhi temperatur pembentukan hidrat. Temperatur yang digunakan adalah 271 K, 273 K dan 275 K. Laju pembentukan hidrat dinyatakan dalam bentuk tekanan yang ada pada hidrat dan banyaknya konsumsi gas hidrat propana butana. Stabilitas gas hidrat propana butana dinyatakan sebagai tekanan penguraian gas pada hidrat. Sedangkan kapasitas penyimpanan hidrat merupakan perbandingan antara volume gas yang tersimpan pada kondisi actual hidrat dibanding dengan volume gas pada kondisi STP. Selanjutnya dari hasil ekperimen tersebut, data yang didapatkan akan divalidasi dengan menggunakan persamaan Arrhenius untuk melihat laju pembentukan hidrat serta kapasitas penyimpanan hidrat. Performance hidrat teoritis didapatkan dari perhitungan dengan menggunakan persamaan Arrhenius dengan mengitung besarnya tekanan dan temperatur eksperimen yang kemudian digambarkan ke dalam Arrhenius plot. Hasil penelitian menunjukkan bahwa laju pembentukan gas hidrat tercepat berada pada temperatur cooling bath yang terendah. Sedangkan stabilitas hidrat terbaik berada pada temperatur cooling bath terendah. Namun, kapasitas penyimpanan terbesar berada pada kondisi temperatur cooling bath tertinggi. Hasil validasi menunjukkan kesesuaian performance hidrat yang berupa laju pembentukan dan kapasitas hidrat baik secara aktual (eksperimen) maupun secara teoritis. Manfaat dari penelelitian ini adalah untuk mengetahui laju pembentukan hidrat dapat diprediksi, yang bermanfaat untuk metode penyimpanan gas dan untuk mengindari terjadinya hidrat saat proses pendistribusian gas.

PENGIDENTIFIKASIAN ENTALPI BAHAN BAKAR PADAT (CHAR) DAN CAIR (TAR) HASIL PROSES PIROLISIS BIOMASA Widya Wijayanti
ROTOR Vol 7 No 1 (2014)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (596.984 KB)

An experimental study of pyrolysis method had been conducted to support alternative fuels demand. It was very attractive method to convert the biomass; mahogany wood to be the alternative fuels. For that reason, an appropriate pyrolyzer will be required to support the process. Due to thermochemical process, an occurred energy transfer all through the process considered not only the heat transfer mechanism but also the chemical reaction mechanism producing heat of reaction in the pyrolysis products (enthalpy). Therefore, the study aims to identify the influence of different temperatures on the measured enthalpy of pyrolysis by means of calorimetrical measurement. The biomass samples used mahogany wood that would be pyrolyzed in the experimental run. Afterward, the influence of temperature toward the solid (char) and liquid (tar) yields were investigated. The enthalpy yields formation would be presented by calorific/heating value of formed char/solid yields indicating important-physical properties of fuel. The results referred that the values of solid yield enthalpy were pointed in the increasing values with the increasing of pyrolysis temperature, however,the enthalpy values of tar inclined to temperature of 500°C. It would decline because the viscosity of tar becomes lighter. Keywords: Enthalpy, Char, Tar, Biomass, Pyrolysis

CO-PYROLYSIS OF SCRAP TIRES (ST) DAN PLASTIK POLYPROPYLENE (PP): DISTRIBUSI PRODUK DAN PROPERTIS FISIK PYRO-OIL Ilyas Sofana; Widya Wijayanti; Nurkholis Hamidi
Jurnal Rekayasa Mesin Vol. 13 No. 3 (2022)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v13i3.952

Plastic waste and scrap tires (ST) have now become pollution that harms the environment in various cities around the world if not managed properly. As pollutants, the two types of waste are actually very interesting to manage because they contain hydrocarbon elements so that they can be processed and have the potential to become alternative fuels. This study aims to determine the effect of co-pyrolysis of scrap tires (ST) and polypropylene (PP) plastic on the distribution of products in the form of oil and char/charcoal. The pyrolysis process was carried out at a temperature of 450℃ for 90 minutes using a fixed bed pyrolysis reactor with ST:PP mixing variations, namely 9:1, 8:2, 7:3, 6:4, and 5:5. The maximum pyrolysis product yield in the form of oil as much as 40.7 Wt% was obtained at a 6:4 mixing variation followed by a 7:3 (36.7 Wt%) mixing variation, then a 5:5 variant (36 Wt%), after that an 8:2 variant (34.3 Wt%) and the last is the 9:1 mixing variation with a total of 28.3 Wt%. For the maximum pyrolysis product in the form of char as much as 42.6 Wt% obtained at 9:1 mixing variation followed by 7:3 mixing variation (41 Wt%) after that 8:2 variant with 38.7 Wt%, then 6:4 with the amount of 27.7 Wt%, and the last is the mixing variation of 5:5 to obtain the char result of 18.3 Wt%. Physical properties of pyro-oil in the form of density and calorific value will also be shown in this study.

Co-Authors Ilyas Sofana Mega Nur Sasongko Moh. Muhyidin Agus Wibowo Nurkholis Hamidi Nurkholis Hamidy Nuzullis Lailatul Kamaliyah Pratikto, Pratikto Purnami Purnami Sugiono Sugiono

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