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"ABSTRAKKecepatan produk sampai ke pasaran menuntut kecepatan dalam pemilihan desain, dimana bentuk desain dipengaruhi oleh fitur, bentuk fitur berbeda bisa memiliki fungsi sama sehingga pilihan bentuk fitur akan ikut menentukan dalam proses permesinan dan biaya produksinyaPada penelitian ini dilakukan penetapan identitas melalui pengenalan informasi geometri dari bentuk-bentuk fitur yang diklasifikasikan oleh Jong-Yun Jung kemudian digambar dengan model solid disimpan bentuk stp atau step file selanjutnya diekstrak dengan notepad sehingga diperoleh entity Advance_Face dan Edge_Curve, yang diolah menjadi koefisien relatif produk.Indek kompleksitas fitur produk mekanik dihitung menggunakan model yang dikembangkan sebelumnya oleh El Maraghy dan diperoleh nilai kompleksitas tertinggi untuk fitur rotasional adalah bentuk Neck yaitu 6,30, fitur prismatik bentuk slot yaitu 6,05, fitur slab yaitu bentuk pocket sebesar 5,66 dan fitur revolving sebesar 4,94

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AbstractThe speed of products demands speed in the selection of design where design is influenced by the shape of the feature, having different form of a feature can have the same functions so insiders features form options determine the process of machinery and production costs.This research was conducted on identity determination through the introduction of information geometry forms features are classified by Jong-Yun Jung later drawn with CAD solid form, it saved on stp model or step file and then extracted with notepad so that retrieved entity Advance_Face and Edge_Curve, which are processed into relative complexity coefficients.Feature product complexity index was calculated using a model developed by El Maraghy and accrues the highest complexity value for rotational features is a form of neck of 6.30, prismatic features form slots which of 6.05, the form of pocket features slab of 5.66 and revolving features of 4.94."

"Kemampuan dalam menghadirkan sebuah produk yang dapat dipastikan tingkat reliability, availabilty, dan mantainability sudah menjadi syarat tersendiri bagi para industri di tengah masyarakat ini. Di dalam siklus hidup sebuah produk, ada tiga tahap utama yang menentukan sifat pokok produk tersebut yakni, tahap perencanaan, produksi, dan penggunaan-pemeliharaan. Penelitian yang ada telah menghadirkan pemodelan perhitungan kompleksitas sistem manufaktur sebagai salah satu jenis alat ukur sebuah produk ketika melewati tahap produksi. Penelitian ini mengadaptasi pemodelan perhitungan kompleksitas ke dalam lingkungan lain yakni pada tahap pemeliharaan dengan menguraikan karakterisasi semua parameter yang berpengaruh dalam setiap tahapan pemeliharaan ke dalam model perhitungan kompleksitas. Pembobotan multi tier ranking dan normalisasi sebagai bagian dalam model perhitungan digunakan untuk menilai parameter parameter tersebut kedalam bentuk angka kuantitatif Pemodelan ini akan berperan sebagai tool untuk menilai kegiatan pemeliharaan yang dijalani oleh sebuah produk Perancangan pemodelan perhitungan kompleksitas pemeliharaan ini ditempuh melalui implementasi pada studi kasus pemeliharaan sepeda motor 100cc dan 883cc. Hasil yang diperoleh adalah nilai indeks kompleksitas pemeliharaan sebesar 79 65 untuk sepeda motor 100cc dan 88 67 untuk sepeda motor 883cc. Pembentukan model perhitungan indeks kompleksitas akan dibahas lebih detail di dalam penelitian ini.

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The ability to deliver a product, that has the right levels of reliability, availabilty, and mantainability, has become a mandatory requirement for any industry in this era of society. In a product lifecycle, there are three main stages that determine those basic properties in a product, they are : stage of development, production, and use - maintenance. Existing research has presented the complexity of the manufacturing system modeling calculations as a tool to asses a product as it passes through the production stage. This thesis adapted the computation modeling complexity into another environment : the stage of maintenance, by outlining all the parameters, that influence every activity in the maintenance system, into the the model calculations of complexity. Multi-tier ranking and normalization, as part of the calculation model, are being used to assess these parameters in the form of numbers (quantitative). For this time being, this model will serve as a tool to assess the maintenance activities undertaken by a product. The modeling design of maintenance complexity is achieved through the implementation of maintenance case study from 100cc and 883cc motorcycles. The results of the maintenance complexity from the study case are respectively 79.65 for motorcycles 100cc, and 88.67 for 883cc motorcycles. The development for the modeling design of maintenance complexity will be discussed further in this thesis."

"Systematic consideration of environmental aspects within the early stages of product development (PD) can be considered highly significant in order for the overall environmental performance of the product to be improved. Many methods and tools have been developed aiming to enable this consideration and provide the properties that need to be considered and improved. This article provides an overview of some well-known and more applicable tools and methods that have been developed and are available today. The identified tools are generally classified in two groups: Guidelines and Analytical tools. The limitations and barriers of current tools are assessed and categorized and two areas for work are proposed in order to address current limitations in the existing literature. One of the areas is followed and a scoring model is proposed as a new tool for sustainable PD."

"The transition within business from a linear to a circular economy brings with it a range of practical challenges for companies. The following question is addressed: What are the product design and business model strategies for companies that want to move to a circular economy model? This paper develops a framework of strategies to guide designers and business strategists in the move from a linear to a circular economy. Building on Stahel, the terminology of slowing, closing, and narrowing resource loops is introduced. A list of product design strategies, business model strategies, and examples for key decision-makers in businesses is introduced, to facilitate the move to a circular economy. This framework also opens up a future research agenda for the circular economy."

"Finding the novelty in and developing new science and engineering applications in the world is very important and interesting. Overall, process and product engineering aims to improve and increase the effectiveness of the engineering process in order to achieve the optimum conditions. However, engineering and environmental applications still contain various limitations such as high energy demand, catalyst costs, and less reuse or regeneration of adsorbents and catalysts. These challenges have led to the exploration of cheaper precursors, the regeneration of adsorbents or catalysts, mechanisms reactions, and overall optimization of the engineering process. Moreover, multifunctional and advanced materials could be promising as materials for further applications. To the best of our knowledge, investigation and exploration of the precursors, methods, design, instruments, product, and/or manufacturing is required for the future as they facilitate and integrate with each other. The adsorption process is a simple and important method for many applications within the environment and industries to deal with the removal of heavy metals, pollutants, and odor from wastewater, and to tackle polluted air. Clean energy sources and global warming have been major issues and challenges for many years, including a reduction of co2. Much attention has been paid to the key issue of developing alternative uses for by-products (waste) in addressing the sustainability of this resource. In particular, the utilization of any by-product (waste) as a useful product should be considered as a source of economic, eco-friendly, high-efficiency, and renewable materials, and should follow at least one rule, such as the “polluter pays” principle. This is expected to pave the way for the attainment of advanced applications. All of the findings of this research are effective and may be used to enable the further development of environmental applications for the removal of a diverse range of pollutants, diminish hazardous pollutants, and facilitate the minimization method for the management of waste. On the other hand, to improve the production of renewable energy and further applications, the overall process also needs to be considered, including the temperature, time, feedstock composition, catalyst, and arrangement of the design.to address the above problems, the 2nd international tropical renewable energy conference (i-trec) 2017 was held on october 3–4, 2017 at the courtyard by marriott bali nusa dua resort, bali, indonesia. The 2nd i-trec 2017 was proudly organized by the tropical renewable energy center, faculty of engineering, universitas indonesia. The main theme of the 2nd i-trec 2017 was “towards tropical renewable energy innovation and technology integration.” The 168 presented papers came from various countries, such as australia, brunei darussalam, brazil, france, indonesia, japan, and malaysia. The 2nd i-trec 2017 covered three symposia, namely renewable energy system and regulation, biomass and biotechnology, and multifunctional and advanced materials for renewable energy applications. From a total of 168 papers from the three symposia, we selected 22 for publication in ijtech. The papers are from a range of fields, as follows: architecture (1), chemical engineering (9), civil engineering (1), electrical engineering (1), mechanical engineering (7), and metallurgical and materials engineering (3). All of the 22 selected papers from the three symposia are summarized below."

"Pemodelan dan identifikasi merupakan suatu tahapan yang penting dan menantang pada perancangan pengendali berbasis model seperti internal model control (IMC) atau model-based predictive control (MBPC). Kebanyakan proses-proses industri merupakan proses-proses non-linier multi-input multi-output (MIMO). Dalam tesis ini dilakukan identifikasi sistem non-linier MIMO empat tangki menggunakan model fuzzy Takagi-Sugeno. Untuk membuat model ini, digunakan algoritma Gustafson-Kessel (GK) fuzzy clustering yang mengotomatisasi pembuatan fungsi keanggotaan dari bagian premis, fungsi affine linier dari bagian konsekuen dan aturan-aturannya. Data-data diperoleh dari simulasi model proses sistem empat tangki.Validasi model menunjukkan bahwa model menunjukkan kinerja sangat balk terhadap data identifikasi dan terhadap data Validasi, dengan nilai Variance Accounted For (VAF) di atas 99%. Uji step menunjukkan model fuzzy Takagi-Sugeno lebih baik dari model linier ARX. Steady state error cenderung meningkat dengan bertambah besarnya amplitudo step, kemungkinan disebabkan oleh data pelatihan yang lebih banyak pada level rendah.

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Modelling and identification are important and challenging steps in design of control systems especially model-based control systems like internal model control (IMC) and model-based predictive control. Industrial processes are mostly nonlinier multi-input multi output (MIMO) process. Work in this thesis is the identification of nonlinier multi-input multi-output of quadrupole-tank system by fuzzy Takagi-Sugeno model using Gustafson-Kessel (GK) fuzzy clustering algorithm. This algorithm automates membership-function creation of premis part, affine linier function of consequent part, and the rules. Data required to make the model are obtained by simulation of quadrupole-tank process model.

Model validation shows that performance of the model is very good on both identification and validation data, that the value of Variance Accounted For (VAF) is more than 99%. Step test shows that fuzzy Takagi-Sugeno model is better than ARX. Steady state error tend to be worse on increasing of step amplitude, this maybe caused by training data which are mostly at low level."

"Penelitian ini bertujuan untuk memberikan perencanaan peningkatan fleksibilitas produksi pada produk dengan unmatching ratio tertinggi pada sebuah perusahaan di Indonesia. Penelitian ini berfokus pada permasalahan ketidakmampuan menyerap fluktuasi order yang dilakukan oleh dealer atau end customer di salah satu perusahaan otomotif ternama di Indonesia. Jika hal itu tidak dapat diatasi, maka akan berpotensi terjadinya cancelation order. Untuk itu, diperlukan perbaikan untuk dapat meningkatkan fleksibilitas produksi perusahaan. Metode yang digunakan dalam penelitian ini adalah DMAIC (Define, Measure, Analyze, Improve & Control) untuk mendapatkan solusi yang tepat. Perbaikan yang dilakukan akan memberikan dampak terhadap opportunity cost dan unmatching ratio. Pada penelitian ini, dibuat skema penyerapan fluktuasi order secara mingguan berupa WOC (Weekly Order Change) dengan melakukan pengadaan safety stock terhadap unique part dengan melakukan perhitungan menggunakan Q-model. Hasil yang didapatkan dari penelitian ini adalah profit sebagai opportunity cost Rp431.635.851 serta penurunan unmatching ratio dari 4,9% pada keadaan sebelum menjadi 1,2% pada keadaan setelah perbaikan

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This study aims to increasing production flexibility on highest unmatching ratio products in a Indonesia company. This study focuses on the problem of an inability to absorb orders fluctuations by dealer or end customer at one of Indonesia's leading automotive companies. If it is not solved, it will potentially causes cancelation order. Therefore, the necessary improvements in order to increase the production flexibility of the company. Method used in this research is DMAIC (Define, Measure, Analyze, Improve & Control) in way to get the right solution. Improvements will have an impact on opportunity cost and unmatching ratio. In this study, absorption scheme fluctuations order on a weekly basis in the form of WOC (Weekly Change Order) with adding a safety stock of unique part by using Q-model calculations. The results obtained from this study is the profit as the opportunity cost IDR431,635,851 and unmatching ratio decrease from 4.9% in before condition become 1.2% in after condition.

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"Central gathering station 10 (CGS-10) menampung seluruh fluida dari beberapa sumur minyak. Incoming fluida di area CGS-10 saat ini sebesar 212.000 BOPD. Pada tahun 2030 akan dilakukan peningkatan produksi sebesar 312.000 BOPD. Beberapa skenario yang dilakukan menghasilkan kesimpulan performa heat exchanger sudah tidak normal karena temperature outlet maksimum fluida pada berbagai kondisi tidak mencapai 175°F. Setelah dilakukan penilaian kecukupan kapasitas pada fasilitas yang ada, perlu adanya penambahan heat exchanger. Pada praktik keinsinyuran ini, analisis mechanical design dilakukan berdasarkan datasheet proces dan penjadwalan proyek berdasarkan analisis material take off (MTO) pada pekerjaan konstruksi civil & piping, dibantu dengan software Microsoft Project yang mempermudah dalam pembuatan engineering, procurement & construction (EPC Schedule). Dari Praktik keinsinyuran ini didapatkan material Tubes SA 213 TP316L ; Tubesheet, Baffles/Tube Support & Floating Head Cover SA 240-316L ; Tie Rods & Spacers SS 316L ; Bolt & Nut SA-193-B7 & SA-194- 2H ; Shell & Shell Cover SA 516 Gr.70 ; Shell Flange SA 105 ; Channel/Bonnet, Channel Cover & Channel Flange SA 105 + SA 240-316L Clad. Jalur kritis pada aktivitas bidding process, project management & administration, engineering, procurement, heat exchanger installation, dan pre-commisioning & commissioning dengan total keseluruhan durasi proyek yaitu 543 Hari.

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Central gathering station 10 (CGS-10) accommodates all fluids from several oil wells. Incoming fluid in the CGS-10 area is currently 212,000 BOPD. In 2030, production will increase by 312,000 BOPD. Several scenarios carried out resulted in the conclusion that the heat exchanger performance was not normal because the maximum outlet temperature of the fluid under various conditions did not reach 175°F. After assessing the capacity adequacy of existing facilities, it is necessary to add a heat exchanger. In this engineering practice, mechanical design analysis is carried out based on process data sheets and project scheduling based on material take off (MTO) analysis in civil & piping construction work, assisted by Microsoft Project software which makes it easier to create engineering, procurement & construction (EPC Schedules). From this engineering practice, the material Tubes SA 213 TP316L was obtained; Tubesheet, Baffles/Tube Support & Floating Head Cover SA 240-316L ; Tie Rods & Spacers SS 316L ; Bolt & Nut SA-193-B7 & SA-194-2H ; Shell & Shell Cover SA 516 Gr.70 ; Shell Flange SA 105; Channel/Bonnet, Channel Cover & Channel Flange SA 105 + SA 240-316L Clad. The critical path includes bidding process, project management & administration, engineering, procurement, heat exchanger installation, and pre-commissioning & commissioning activities with a total project duration of 543 days."

"ABSTRAKPermasalahan yang dihadapi oleh Lubes Oil Blending Plant (LOBP) Jakarta dewasa ini adalah perencanaan dan pengendalian persediaan material yang sesuai dengan kondisi yang ada diperusahaan. Beranjak dari masalah tersebut, maka tujuan dari studi ini adalah menyusun perencanaan dan pengendalian persediaan sebagai upaya memperbaiki sistem yang ada.Dari hasil evaluasi dan analisa, maka diusulkan suatu alternatif untuk pemecahan masalah tersebut yaitu dengan pendekatan Material Requirement Planning (MRP). Masukan utama dari metode MRP adalah Master Production Schedule (MPS) , Bill of Material (BOM) dan inventory Record dan sebagai keluarannya adalah perencanaan produksi atau perencanaan pembelian.Proses MRP meliputi netting , lotting dengan memperbandingkan tiga teknik lot size untuk mendapatkan ukuran lot yang ekonomis, serta diikuti dengan offseting dan explosion.Dengan penerapan metode MRP yang diusulkan diharapkan Perusahaan tidak akan kehilangan penjualan potensial sebesar Rp 45,3 miliyar pada tahun 199711998.Metode MRP dapat memberikan informasi yang diperlukan untuk pertimbangan dalam pengambilan keputusan.

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ABSTRACT

Problem faced by Jakarta Lubes Oil Blending Plant (LOBP) nowadays are the planning and inventory control problems which must be in accordance with the firm's condition and business environment. Based on the problems identified, the objective of this study is to document the planning and inventory control as a mean to improve the existing system.

From the evaluation and analysis results, it is proposed to use the Material Requirement Planning (MRP) approach to solve the problems.The main input for the MRP method are the Master Production Schedule (MPS), Bill of Material (BOM), and Inventory Record, while the output are the Production Planning and Purchase Order Planning.

MRP processes include the netting and lotting by comparing three lot size technique to find out the most economical lot size and then followed by the offseting and explosion.

By implementing the proposed MRP method, the company would not lose its approximately Rp 45.3 billion potential sales in the year 199711998.

The MRP method also supplies necessary information to be considered in the decision making process."