Hasil Pencarian  ::  Simpan CSV :: Kembali

"This book offers recommendations on the milling processes for the carbon fiber reinforced plastic CFRP/Al2024. Due to the anisotropic and non-homogeneous structure of CFRP and the ductile nature of aluminum, the machining of this material is very challenging and causes various types of damage, such as matrix cracking and thermal alterations, fiber pullout and fuzzing during drilling and trimming, which affect the quality of machined surface.The book studies and models the machined surface quality of CFRP/Al2024 using a two-level full factorial design experiment. It describes the processes of trimming using down milling, and statistically and graphically analyzes the influence and interaction of cutting parameters. Lastly, the book presents the optimization of the cutting parameters in order to create a surface texture quality of CFRP/Al2024 to less than 1 µm."

"Skripsi ini bertujuan untuk mendapatkan solusi dan alternatif perbaikan masalah kasus repair engine dikarenakan terjadinya gangguan pada putaran pompa oli yang akan berdampak pada temperatur mesin motor yang panas (over heat) yang bisa menyebabkan kerusakan pada komponen part engine lainnya. Metode yang digunakan digunakan adalah Six Sigma yang terdiri dari tahapan Define, Measure, Analyze, Improve, Control (DMAIC). Aktivitas yang dilakukan pada tahap define adalah identifikasi masalah, menetukan Critical To Quality (CTQ), Logic Tree Diagram, SIPOC diagram. Tahap measure melakukan pemetaan proses, pengukuran terhadap kemampuan proses (Cp). Tahap analyze melakukan analisa terhadap kemungkinan-kemungkinan yang menyebabkan masalah dengan diagram tulang ikan (sebab akibat), Failure Tree Analysis (FTA) dan Failure Mode Effect and Analysis (FMEA). Tahap improve melakukan perbaikan dari hasil-hasil analisa penyebab masalah. Tahap control melakukan monitoring terhadap perbaikan-perbaikan yang telah dilakukan, dengan menggunakan Statistical Process Control (SPC). Dari tahapan perbaikan diatas didapatkan faktor yang mempengaruhi terjadinya ganguan pada putaran pompa olir adalah adanya penyimpangan pada concentricity spindle cam chain dan juga cacat pada permukaan diameter 8 dan 9 dari spindle. Berdasarkan tahap perbaikan yang dilakukan, metode six sigma sangat efektif dalam menyelesaikan masalah diatas ini diidentifikasikan dengan naiknya nilai indeks kemampuan proses (Cp), menurunnya angka kegagalan proses dalam Part Per Million (PPM) dan naiknya nilai sigma level.

---

The purpose of this final project is to get the solution and the alternative corrective actions on repair engine claim's that cause of problem in oil pump wheeling. This problem has negative effects on engine temperature (engine over heat) that can appear damaged to the other engine component. The method used in analyzing and solving the problem is Six Sigma, which includes the phases of Define, Measure, Analyze, Improve, Control (DMAIC). The activities on Define phase are problem identification, Critical to Quality decision making,logic Tree Diagram and SIPOC Diagram formulation. The next step is Measure phase, hich involves the activities of process mapping and Capability Process Index (Cp) measurement. The third step is Analyze phase. The activities done on this step are potential problem analysis using Fishbone diagram (cause and effect diagram), Failure Tree Analysis (FTA) and Failure Mode Effect and Analysis (FMEA). The phase is followed by Improve phase, including the activities of corrective action execution on the basis of potential problem analysis done on prior step. The final step is Activity Control phase; that is performing the monitoring action to the improvement outcome, using Statistical Process Control (SPC).

The conclusion obtained from doing those former activities is that the factors causing the stucked oil pump wheeling problem are concentricity of spindle cam chain out of specification and scrath on the surface diameter 8 and 9 spindle cam chain. Due to the completion of problem identification and corrective action, it can be concluded that six sigma method is very effective on problem solving. It is indicated by the increase of capability index value (Cp), the decrease of defect process index value in parts per million (PPM) and the increase of sigma level value."

"Jakarta barometer mutu dan kehandalan listrik nasional sehingga perlu ditingkatkan customer experience menuju World Class Services, khususnya kawasan dengan revenue tinggi dan VIP. Kondisi saat ini penyebab dominan gangguan distribusi adalah Saluran Kabel Tegangan Menengah dan Jointing, sehinga diperlukan skenario evakuasi beban untuk pemenuhan contingency N-1 dalam rangka percepatan manuver pada saat terjadi gangguan. Sesuai roadmap service excellent PLN UID Jakarta target System Average Interruption Duration Indeks (SAIDI) di tahun 2033 sebesar 10,94 menit/pelanggan, dan realisasi di tahun 2023 sebesar 29,86 menit/pelanggan sehingga diperlukan strategi peningkatan kehandalan sistem distribusi. Tujuan dari penelitian ini untuk membuat studi kelayakan pengembangan smart grid dengan implementasi otomatisasi jaringan di sistem spindle untuk peningkatan kehandalan, revenue dan customer experience di kawasan prioritas PLN UID Jakarta. Penambahan Gardu Induk baru sesuai RUPTL akan berdampak adanya perubahan rekonfigurasi dan penambahan jaringan baru dalam rangka pembebanan penyulang dan menyebabkan topologi jaringan distribusi semakin kompleks tidak murni sistem spindle, di samping itu kondisi Jakarta yang macet juga berdampak semakin lama dalam pengusutan gangguan, serta keterbatasan anggaran investasi PLN belum mendukung pemasangan titik Keypoint baru di semua gardu distribusi. Penelitian ini dilakukan dengan pemodelan sistem di Distribution Management System SCADA untuk contingency N-1 dan dilakukan simulasi pengujian Self-Healing Mechanism berdasarkan parameter data statik dan dinamis secara realtime sesuai Load Flow dan Forecast beban di sistem SCADA. Selanjutnya dilakukan evaluasi kelayakan teknis dan finansial untuk dijadikan desain smart feeder yang akan diimplementasikan di sistem spindle PLN UID Jakarta dengan biaya investasi yang lebih ekonomis. Dengan melakukan Studi Kelayakan Pengembangan Distribution Automation System dengan Implementasi Fault Management fungsi Fault Location, Isolation and System Restoration (FLISR) diharapkan menjadi desain Distribution Grid Management yang layak diimplementasikan di sistem Spindle 20kV sebagai alternatif Zero Down Time untuk percepatan recovery time gangguan distribusi dan memperbaiki kinerja kehandalan dalam pengendalian operasi sistem distribusi di PLN UID Jakarta.

---

Jakarta is a barometer of the quality and reliability of national electricity, so it is necessary to improve the customer experience towards World Class Services, especially areas with high revenue and VIP. Currently, the dominant causes of distribution disturbances are Medium Voltage Cable Channels and Jointing, so a load evacuation scenario is needed to fulfill the N-1 contingency in order to accelerate maneuvers in the event of a disturbance. According to PLN UID Jakarta's service excellent roadmap, the target is the System Average Interruption Duration Index (SAIDI) in 2033 of 10.94 minutes/customer, and the realization in 2023 is 29.86 minutes/customer, so a strategy is needed to increase the reliability of the distribution system. The purpose of this research is to make a feasibility study on the development of a smart grid by implementing network automation in the spindle system to increase reliability, revenue and customer experience in the priority areas of PLN UID Jakarta. The addition of a new main substation in accordance with the RUPTL will result in reconfiguration changes and the addition of new networks in order to load feeders and cause the distribution network topology to become more complex and not purely a spindle system, in addition to the congested conditions in Jakarta which also have an impact on the longer time it takes to investigate disturbances, as well as limited investment budgets. PLN does not yet support the installation of new Keypoint points at all distribution substations. This research was conducted by system modeling in the SCADA Distribution Management System for contingency N-1 and carried out a Self-Healing Mechanism test simulation based on static and dynamic data parameters in real time according to Load Flow and Load Forecast in the SCADA system. Furthermore, an evaluation of technical and financial feasibility is carried out to be used as a smart feeder design that will be implemented in the PLN UID Jakarta spindle system with a more economical investment cost. By conducting a Feasibility Study on the Development of a Distribution Automation System with Fault Management Implementation of the Fault Location, Isolation and System Restoration (FLISR) function, it is hoped that a Distribution Grid Management design that is feasible to implement in the 20kV Spindle system as an alternative to Zero Down Time to accelerate distribution disruption recovery time and improve performance reliability in controlling the operation of the distribution system at PLN UID Jakarta."

"In this volume, the design, manufacture and control technology of precision machines are introduced to achieve the concrete requirements for precision engineering. The state-of-the-art of precision machining processes including precision turning, milling, grinding and lapping/polishing are discussed. The key components of precision machines are introduced as well, such as precision spindles, control systems, tools and grinding wheels etc. For design part, methods for the design and simulation of the general structure of precision machines as well as the key components are described in details. For manufacture part, fabrication and assembly technologies for different types of precision machines are introduced. For control part, control system, measurement and compensation technology for precision machines are discussed. The information provided in the book will be of interest to industrial practitioners and researchers in the field of precision machines and their control."