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All Journal Agrointek REKAYASA Journal of Energy, Mechanical, Material and Manufacturing Engineering Jurnal Teknik Industri: Jurnal Keilmuan dan Aplikasi Teknik Industri International Journal of Science, Engineering and Information Technology Indonesian Journal of Cultural and Community Development Makara Journal of Technology Jurnal Teknik Industri

Mohamad Mustajib, Mohamad

Universitas Trunojoyo Madura

Author-ID : 976699

Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Physics

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STUDI KEBIJAKAN ERGONOMI MAKRO TERHADAP OUTPUT PRODUKSI MENGGUNAKAN PENDEKATAN SISTEM DINAMIK (STUDI KASUS: PT. SUMBER MAS INDAH PLYWOOD, GRESIK) Hima, Amalia Faikhotul; Umami, Mahrus Khoirul; Mustajib, Mohamad Imron
Rekayasa Vol 5, No 1: April 2012
Publisher : Universitas Trunojoyo Madura

PT. Sumber Mas Indah Plywood merupakan salah satu perusahaan manufaktur yang bergerak di bidang pembuatan plywood. Namun, perusahaan ini juga menghasilkan produk sampingan berupa moulding, polyester, dan lumber core. Penelitian ini bertujuan untuk menganalisis pengaruh kebijakan ergonomi makro terhadap output produksi menggunakan sistem dinamik. Dengan menggunakan perangkat lunak simulasi vensim PLE, dapat diketahui bahwa kebijakan ergonomi makro memberikan pengaruh positif terhadap output produksi, namun pengaruh ini tidak ditunjukkan secara langsung melainkan bertahap sesuai interaksi yang ditunjukkan pada model. Pada pengembangan model sistem dinamik, terdapat 5 skenario untuk mencapai tujuan perusahaan, yaitu meningkatkan output produksi. Skenario pertama adalah dengan meningkatkan pembiayaan investasi ergonomi dari 1 Milyar menjadi 3 Milyar. Skenario kedua adalah mengurangi jumlah investasi ergonomic dari 1 Milyar menjadi 500juta. Skenario ketiga adalah dengan meningkatkan prosentase investasi perusahaan. Skenario keempat adalah meningkatkan harga pokok penjualan sebesar 10%. Sedangkan skenario kelima adalah menurunkan biaya operasional. Berdasarkan alternatif skenario, ternyata pada skenario 3 mengasilkan rata-rata output produksi terbesar. Sedangkan dari sisi nilai keuntungan perusahaan, skenario 5 adalah yang terbaik. Pemilihan skenario tersebut berdasarkan analisis net present value (NPV) dengan menggunakan tingkat bunga sebesar 10%. Pada analisis NPV, diketahui bahwa pada skenario 5 menghasilkan NPV sebesar Rp 7.396.523,07 juta. Dalam kasus seperti ini, perusahaan memiliki tujuan untuk meningkatkan output produksi sehingga skenario yang berkaitan dengan keuntungan perusahaan hanya dijadikan pertimbangan. Oleh karena itu, perusahaan sebaiknya memilih skenario 3 dikarenakan pada alternatif tersebut mengahasilkan rata-rata output produksi yang paling tinggi.

OPTIMISASI PERAWATAN BERBASIS AGE REPLACEMENT DENGAN PENDEKATAN ALGORITMA BISECTION Anwar, Khairul; Mustajib, Mohammad Imron; Ilhamsah, Heri Awalul
Rekayasa Vol 5, No 1: April 2012
Publisher : Universitas Trunojoyo Madura

Makalah ini membahas tentang optimisasi menggunakan perawatan age replacement dengan pendekatan algoritma bisection. Objek penelitiannya adalah lini produksi kaca pada PT. Iglas (persero). Hasil pengambilan data didapat mesin produksi yang banyak mengalami kerusakan adalah mesin forming 1.1 dan mesin forming 1.2, dengan komponen krisisnya adalah arm neckring, dengan distribusi kerusakan dari komponen tersebut adalah lognormal dengan nilai mean 2,6 dan standart deviasi 1,36 pada mesin forming 1.1 dan mean 3 dan standart deviasi 2 untuk mesin forming 1.2. Berdasarkan optimisasi menggunakan metode bisection diperoleh bahwa waktu optimum untuk melakukan tindakan age replacement pada komponen arm neckring rata-rata yaitu 28,125 hari = 675 jam untuk mesin forming 1.1 dan 20,15631 hari = 483,7514 jam untuk mesin forming 1.2.

Pengembangan Know ledge Base Systems untuk Pemilihan TIPE Sambungan Las Mustajib, Momahammad Imron
Rekayasa Vol 1, No 1: April 2008
Publisher : Universitas Trunojoyo Madura

Welding is one of the manufacturing process used tomake the connection of components Imetal parts intendedfor assembly. There aremanyfactors toconsider inplanning a welding connection, including costfactors, power and ease of workmanship in the process. Cross sectional area smaller number of wires that require fewer and thus more economical. For that a decision tool that has the capability of knowledge (knowledge base) obtained from the domain expertise required to consider alternativeforms of alternataf weld connection on the basis of three criteria: minimum cross-sectional area. Destination of the study in this research is to develop a model of knowledge-based software knowledge (knowledge-based systems)welding the connection type selection criteria: cross-sectional area to minimize welding connection, and ease of manufacture hem welding, using a computerprogram capabilities that could save the base knowledge (knowledge base). The acquisition of knowledge of welding connection type domain expertise, data preparation section area calculation, and the stage reprsentasi knowledge to build a knowledge base systems. Use of software knowledge-based systems for selection of welding plate connection provides time-saving convenience and selection of welding connection as part of the manufacturing process planning

PENINGKATAN ADDED VALUE KOPRA PUTIH DENGAN METODA INDIRECT DRYING M Imron Mustajib; Burhan Burhan
AGROINTEK Vol 8, No 1 (2014)
Publisher : Agroindustrial Technology, University of Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/agrointek.v8i1.2030

Traditionally, drying of copra is carried out by sundrying or fumigation on a tomang (clay furnace). However, using these methods, the quality of copra resulted cannot be guaranteed and the prices is low, and thus the process is unprofitable. Another problem is that it is difficult to do the process during rainy season. We facilitated a copra home industry with a dryer with indirect drying system to replace the old copra processing drying equipment. The dryer consists of 12 racks equipped with a temperature controller (with temperatures reaching 150 ° C) and a timer. By controlling temperature and time it was possible to get good quality copra and the process can be done in rainy season. From the test results using LPG fuel at temperature of 70 ° C for 18 hours, white copra was produced with 7% moisture content.

Model Simultan Penentuan Toleransi Komponen Produk Rakitan dan Pabrik dalam Kolaborasi Manufaktur Make-to-Order M. Imron Mustajib
Jurnal Teknik Industri: Jurnal Keilmuan dan Aplikasi Teknik Industri Vol. 12 No. 2 (2010): DECEMBER 2010
Publisher : Institute of Research and Community Outreach - Petra Christian University

This paper discusses the development of simultaneous optimization model to determine component tolerance of assembly product and plant for manufacturing processes by considering quality tolerance limits, and delivery time constraint to minimize total cost in collaboration environment of make-to-order manufacturing systems. Total cost of the system consists of manufacturing costs and quality loss costs as the tolerance function, operational costs for multi-plant manufacturing collaboration which includes: setup costs, material handling costs, operating costs of assembly, manual operations costs, and transportation costs. Formulation of the model developed uses mixed integer non linear programming as a method of solution search. In the numerical examples presented, the optimization process results an optimal solution. Optimal solution is not sensitive if the changes in quality tolerance constraint and delivery time constraint is not large. While the addition of an alternative plant for producing a component can changes the alternative plant selected

Concurrent Engineering of Tolerance Synthesis and Process Selection for Products with Multiple Quality Characteristcs Considering Process Capability Mustajib, Mohamad Imron
Makara Journal of Technology Vol. 16, No. 1
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

The existences of variances that are very difficult to be removed from manufacturing processes provide significance of tolerance to the product quality characteristics target of customer functional requirement. Furthermore, quality loss incurred due to deviation of quality characteristics of the target with a specified tolerance. This article discusses the development of concurrent engineering optimization model of tolerance design and manufacturing process selection on product with multiple quality characteristics by minimizing total costs in the system, namely total manufacturing cost and quality loss cost as functions of tolerance, also rework and scrap costs. The considered multiple quality characteristics have interrelated tolerance chain. The formulation of proposed model is using mixed integer non linear programming as the method of solution finding. In order to validate of the model, this study presents a numerical example. It was found that optimal solution are achieved from proposed model in the numerical example.

Optimization of aluminum 6061 surface integrity on dry-running machining CNC milling using Taguchi methods Rifky Maulana Yusron; Mohamad Imron Mustajib; Imam Hanafi
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 8 No. 1 (2023)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v8i1.25914

Aluminum 6061 is an aluminum alloy, which contains aluminum as main entails, then magnesium and silicon are mixed as alloying elements. It had a good capability for corrosion resistance, heat treatable, formed, and welded. Computerized Numerical Control had excellent capability to process mass-production products. Unsubstantial machining parameter setting will lead to a lack of surface roughness or even worse damage on tool steel. The aim of this research is to arrange data about surface integrity conducted by Dry-running machining CNC Milling. Surface integrity included surface roughness and micro-cracks. Aluminum 6061 is chosen as the material. The observed parameter machining in this research is cutting speed 3 is levels 60, 70, 80 mm/minute, then depth of cut is 3 levels 300, 380, 450 mm/minute and depth of cut is 3 levels 0.5, 0.75, 1.0mm. Taguchi L9 (33) was used as a design experiment to find optimum parameters. Based on the result of the experiment in this research, the optimum surface roughness founded on the machining parameter combination of cutting speed was 80 m/min, feed rate 300 mm/min, and depth of cut was 0.5 mm.

Exploratory Investigation on the Influence of Machining Parameters on Surface Roughness and Tool Wear in the Turning Process of Steel ST-42 Mubarok, Khamdi; Saputro, Agung; Mustajib, M Imron
International Journal of Science, Engineering, and Information Technology Vol 8, No 1 (2023): IJSEIT Volume 08 Issue 01 31 December 2023
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/ijseit.v8i1.24559

This study aims to investigate the influence of the conventional lathe machine's cutting parameters in the turning process of ST-42 steel material on surface roughness and tool wear by employing an HSS tool. The examined cutting parameters encompass the spindle speed and the depth of cut, while maintaining a consistent feed rate. Each cutting parameter was evaluated at three different levels, spindle speed of 330 rpm, 360 rpm, and 500 rpm, and depth of cut 0.2 mm, 0.5 mm, and 1 mm, all with a uniform feed rate of 0.3 mm/minute. The findings of this research demonstrate that alterations in spindle speed and depth of cut exert a discernible influence on both surface roughness and tool wear. Elevated spindle speeds are associated with reduced surface roughness, albeit at the expense of increased tool wear. Conversely, deeper depth of cut correspond to heightened surface roughness, yet lead to decreased tool wear, aiming to achieve a uniform final diameter of the workpiece. By synergistic manipulation of these two parameters, the most favorable outcome in terms of surface roughness and tool wear can be identified. The lowest surface roughness was 4.42 μm, found at a spindle speed of 500 rpm coupled with the depth of cut of 0.2 mm. Meanwhile, the least amount of tool wear, quantified at 0.07 mm, was achieved at a spindle rotation speed of 330 rpm along with a cutting depth of 1 mm. The application of ANOVA analysis substantiates the statistical significance of both parameters, affirming their pivotal role in influencing surface roughness and tool wear.

Hybrid Solar-LPG Dryer for Efficient Shallot Post-Harvest Drying Mustajib, Mohamad Imron; Hasan, Fuad; Wahyuningrum, Rima Tri; Ibrohim, Ikrom Maulana Malik; Yudiansyah, Hilman Tsaqif; Islam, Moh Idzul; Prasetyo, Reynaldi; Albarizy, Ferdy
Indonesian Journal of Cultural and Community Development Vol 16 No 1 (2025): March
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/ijccd.v16i1.1200

Background: Shallots are an important crop in Indonesia, but post-harvest drying remains inefficient, especially in Karang Penang Oloh Village, where traditional sun drying leads to quality loss and long drying times. Aims: This study aims to design a hybrid solar-LPG pyramid dryer to improve drying efficiency and product quality for local farmers. Results: The dryer successfully dried 20 kg of shallots in 10 hours, reducing moisture content from 86% to 12.44%-15.99%. Novelty: The hybrid solar-LPG system offers a scalable and efficient solution for larger-scale drying. Implications: This technology can enhance post-harvest processing, improving both drying time and product quality, with potential for broader agricultural applications. Highlights: Hybrid solar-LPG system reduces drying time for shallots. Moisture content of shallots reduced to optimal levels (12.44%-15.99%). Pyramid dryer design improves drying efficiency and product quality. Keywords: Shallots, Post-Harvest, Drying, Hybrid Technology, Pyramid Dryer

ANALISIS KUALITAS LAYANAN MENGGUNAKAN METODE SERVICE QUALITY (Studi Kasus: AHASS PADAT KARYA) Anggraeni, Dita; Gunawan, Suwardi; Mustajib, M. Imron
Jurnal Teknik Industri (JATRI) Vol. 3 No. 1 (2025): Jurnal Teknik Industri (JATRI)
Publisher : Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/jatri.v3i1.1430

Perkembangan bengkel AHASS di Indonesia tidak terlepas dari beberapa permasalahan yang terjadi. Salah satu permasalahan yang terjadi pada umumnya adalah kurangnya kinerja operasional bengkel AHASS. Oleh karena itu bengkel AHASS Padat Karya harus lebih memperhatikan kualitas layanannya, dengan mengetahui dan mengevaluasi penyebab gap,serta mengusulkan perbaikan dengan melakukan analisis kualitas pelayanan jasa AHASS Padat Karya dengan menggunakan metode service quality, yang terdiri dari tangible, reliability, responsiveness, assurance, dan empathy. Hasil penelitian menunjukkan bahwa Tingkat kualitas pelayanan jasa AHASS Padat Karya dinilai cukup baik meskipun rata-rata ekspektasi lebih besar daripada rata-rata persepsi. Tingkat kualitas pelayanan AHASS Padat Karya dinilai cukup baik meskipun rata-rata ekspektasi lebih besar daripada rata-rata persepsi. Kualitas layanan AHASS Padat Karya masih perlu perbaikan karena gap antara persepsi dan ekspektasi setiap dimensi adalah sebesar -0,675. Berdasarkan diagram IPA nilai persepsi dan ekspektasi rendah berada pada kuadran III, maka usulan perbaikan atribut yang berada pada kuadran III adalah sebagai berikut, sebaiknya pimpinan memberitahu atau menegur karyawan jika terdapat karyawan yang menggunakan pakaian tidak rapi dan sopan, AHASS Padat Karya membersihkan kamar mandi agar pelanggan dapat menggunakan kamar mandi dengan nyaman, AHASS Padat Karya mengubah tampilan bengkel agar terlihat luas dan rapi, AHASS Padat Karya menyediakan akses internet agar pelanggan tidak bosan saat menunggu, AHASS Padat Karya memperhatikan kebersihan dan memperbaiki ruang tunggu untuk pelanggan agar saat turun hujan, pelanggan tidak terkena air, dan AHASS Padat Karya segera melakukan refill jika dilihat tempat air minuman dan permen kosong.

Co-Authors Agung Saputro, Agung Albarizy, Ferdy Amalia Faikhotul Hima Anggraeni, Dita Burhan Burhan Fuad Hasan Gunawan, Suwardi heri awalul ilhamsah Ibrohim, Ikrom Maulana Malik Imam Hanafi Islam, Moh Idzul Khairul Anwar Mahrus Khoirul Umami Mubarok, Khamdi Prasetyo, Reynaldi Rifky Maulana Yusron Rima Tri Wahyuningrum Yudiansyah, Hilman Tsaqif

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