Cycle time reduction in deck roller assembly production unit with value stream mapping analysis

Cycle time reduction is of paramount importance in a manufacturing industry as the customer not only emphasizes on the quality of the product but also takes into consideration the timely delivery of the product. The proposed framework and the advanced methodology in this paper are capable of dealing with each stage of the considered manufacturing unit by maximizing the value of the product through reduction of cycle times and minimization of waste. The time required for all the processes in the manufacturing of the deck rollers is identified and are classified into value added (VA) and non-value added (NVA). Finally, the cycle times were reduced by applying the lean tools and principles on some managerial relevances. Also, Arena software was used to simulate the current and future value stream maps and the change in the cycle times, waiting times, machine utilization, etc. was determined.This work has been supported by COMPETE: POCI-01-0145-FEDER-007043 and FCT – Fundação para a Ciência e Tecnologia within the Project Scope: UID/CEC/00319/2013.info:eu-repo/semantics/publishedVersio

Studi Implementasi Lean Six Sigma Dengan Pendekatan Value Stream Mapping Untuk Meminimumkan Non Value Added Activity Di Industri Galangan Kapal (Studi Kasus Di PT. Dumas Tanjung Perak Shipyard Surabaya)

Ketatnya persaingan pasar dalam era globalisasi ini mendorong perusahaan galangan kapal nasional untuk terus menyadari pentingnya meningkatkan efektivitas dan efisiensi proses produksinya, sehingga, mampu bersaing baik dipasar lokal maupun di pasar internasional. Selama ini tingkat produktivitas galangan kapal nasional masih rendah, terutama aspek pembangunan kapal yang masih lama. Salah satu penyebabnya adalah masih banyaknya non value added activity Konsep lean sigma merupakan integrasi metode dalam proses manufacture yaitu lean manufacture dan six sigma yang saling menguatkan, dimana Lean berfokus pada waste sedangkan six sigma lebih berfokus pada proses improvement. Studi implementasi kedua metode ini dilakukan pada studi kasus pembangunan kapal di PT. Dumas Tanjung Perak Shipyard (PT. Dumas). Dengan melakukan studi implementasi lean six sigma dengan pendekatan value stream mapping ini diharapkan mampu menghilangkan atau meredusir waste (non value added activity) dalam meningkatkan performansi yang terjadi pada proses pembangunan kapal. Hasil penelitian menunjukan perhitungan six sigma didapat nilai DPMO ( Defect per Million Oppurtunities ) yang kemudian dikonversikan ke dalam nilai sigma dan diperoleh nilai kapabilitas sigma untuk proses produksi kapal dengan aktivitas pengelasan sebesar 3,82. Dengan menggunakan kajian Process Activity Mapping didapat waktu efektif PT. Dumas saat ini adalah sebesar 85 persen. Pada proses perbaikan selanjutnya waktu efektif perusahaan dapat ditingkatkan mencapai 91 persen. Dari hasil penelitian ditarik kesimpulan bahwa penerapan konsep Process Activity Mapping dapat diterapkan sebagai alat ukur dan dilaksanakan pada perusahaan galangan kapal dalam pengendalian awal terhadap aktivitas yang tidak bernilai tambah. ================================================================= Tight market competition in this globalization era, encourages the national shipbuilding company to continue to realize the importance of increasing the effectiveness and efficiency of its production process, thus, able to compete in both local and international markets. So far, the national shipyard productivity level is still low, especially the aspect of shipbuilding which is still taking longer production time. One of the causes is the number of non-value added activities that increase the length of production time. The concept of lean sigma is the integration of methods in the manufacturing process of lean manufacturing and six sigma that mutually reinforcing, where Lean focuses on waste aspect, while six sigma is more focused on the improvement process. Study of the implementation of both methods is done on shipbuilding case study at PT. Dumas Tanjung Perak Shipyard (PT Dumas). By conducting a lean six sigma implementation study with value stream mapping approach, is expected to eliminate or reduce waste (non-value added activity) in improving the performance that occurs in shipbuilding process. The result of the research shows that six sigma calculation got DPMO value (Defect per Million Oppurtunities) which then converted into sigma value and obtained sigma capability value for ship production process, with welding activity score 3,82 (Defect per Million Oppurtunities). By using Process Activity Mapping study, the current obtained effective time of PT. Dumas is 85 percent. In the process of further improvement, the company's effective time can be increased up to 91 percent. The results of the study concluded that the application of the concept of Process Activity Mapping can be applied as a measuring tool and implemented in shipbuilding companies in the initial control of activities that are notvalue-added

Intellectualization of the management processes at the enterprise of automotive industry

© 2018 Association for Computing Machinery. Complex production systems, such as the trucks manufacturing, require the intellectualization of processes. Introduction of smart technologies (Industry 4.0) in automotive industry requires new approaches to the managerial decisions making, thus the modelling of a control system becomes the most important part of the manufacturing optimization. In this paper, we present an assembly line simulation model with dynamically changing parameters that allows reacting quickly to the production system’s changes. A software module has been developed to automatically perform such functions, as monitoring the operations (statuses) on positions and developing recommendations to organize logistical flows. The algorithm to determine the state of the assembly line’s position is presented. Introduction of such approach in automotive industry will allow not only optimizing processes and improving product quality, but also establishing favorable conditions for the subsequent intellectualization of the automotive service

Small business innovation research. Abstracts of completed 1987 phase 1 projects

Non-proprietary summaries of Phase 1 Small Business Innovation Research (SBIR) projects supported by NASA in the 1987 program year are given. Work in the areas of aeronautical propulsion, aerodynamics, acoustics, aircraft systems, materials and structures, teleoperators and robotics, computer sciences, information systems, spacecraft systems, spacecraft power supplies, spacecraft propulsion, bioastronautics, satellite communication, and space processing are covered

Experimental evaluation of a mixer-ejector hydrokinetic turbine at two open-water test sites and in a tow tank

For marine hydrokinetic energy to become viable it is essential to develop energy conversion devices that extract energy with high efficiency, and to field-test them in an environment similar to the one in which they are designed to eventually operate. FloDesign Inc., with FloDesign Wind Turbine Corp., developed a Mixer-Ejector Hydrokinetic Turbine (MEHT) that encloses the turbine in a specially designed shroud to increase mass flow through the turbine rotor. A scaled version of this turbine was evaluated experimentally at two open-water tidal energy test sites, and in a tow tank. State-of-the-art instrumentation was used to measure free stream and wake velocities, turbine power extraction, test platform loadings and platform motion induced by sea state. The MEHT was able to generate power from tidal currents over a wide range of conditions, with low-velocity start-up. The decay of the wake velocity deficit was found to improve with increasing free stream turbulence

Automotive Stirling engine development program

The major accomplishments were the completion of the Basic Stirling Engine (BSE) and the Stirling Engine System (SES) designs on schedule, the approval and acceptance of those designs by NASA, and the initiation of manufacture of BSE components. The performance predictions indicate the Mod II engine design will meet or exceed the original program goals of 30% improvement in fuel economy over a conventional Internal Combustion (IC) powered vehicle, while providing acceptable emissions. This was accomplished while simultaneously reducing Mod II engine weight to a level comparable with IC engine power density, and packaging the Mod II in a 1985 Celebrity with no external sheet metal changes. The projected mileage of the Mod II Celebrity for the combined urban and highway CVS cycle is 40.9 mpg which is a 32% improvement over the IC Celebrity. If additional potential improvements are verified and incorporated in the Mod II, the mileage could increase to 42.7 mpg

Design and manufacturing of advanced composite aircraft structures using automated tow placement

Thesis (S.M.)--Massachusetts Institute of Technology, Sloan School of Management; and, Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1996.Includes bibliographical references (leaves 89-91).by Ian B. Land.S.M

FLOW INJECTION INSTRUMENTATION FOR THE IN SITU MONITORING OF NUTRIENTS IN SEA WATER

In order to investigate the biogeochemistry of aquatic ecosystems, a quantitative understanding of primary production and the temporal and spatial distribution of nutrients is necessary. This thesis describes the development of a submersible FI based nutrient sensor for the in situ determination of nitrate in estuarine and coastal waters. Chapter One describes the role of nitrogen in the global and marine nitrogen cycles and provides an overview of laboratory and in situ methods for its determination. Chapter Two describes the key parameters for a field instrument and culminates with the overall design specification for the system. Chapter Three describes in detail the design, build and optimisation of the key individual components of the system, e.g. sample delivery system, injection valve, reduction column, reaction column, flowcell, on-board control system and the housing of the complete integrated system. Chapter Four describes the optimisation and analytical performance of the FI instalment prior to field trials. The key operational parameters such as flowcell path length, injection volume and detector response were investigated. LOD, reproducibility and linear range were determined and the control programme for the onboard computer is reported. For example, a LOD of 0.01 Nitrate-N, a linear range of 0-140 | iM Nitrate-N and a reproducibility of ± 5 % were achieved. Chapter Five describes the field experiments where the FI system was initially used as a bench instrument and compared to a laboratory FI method which had been validated by participation in two interlaboratory exercises and for nitrate in river and sea water. The first submersed deployments involved the optimisation of the system operational characteristics and developing the field techniques. The final part of this chapter describes the weekly field studies of Barn Pool in Plymouth Sound using the submersed nutrient sensor for a period of two months. The operation and performance of the submersed sensor was assessed against an air segmented continuous flow analyser during a Land Ocean Interaction Study (LOIS) North Sea cruise aboard the RVS Challenger. The results from this exercise and the relevant salinity and turbidity measurements are presented in Chapter Six.The Plymouth Marine Laborator

COBE's search for structure in the Big Bang

The launch of Cosmic Background Explorer (COBE) and the definition of Earth Observing System (EOS) are two of the major events at NASA-Goddard. The three experiments contained in COBE (Differential Microwave Radiometer (DMR), Far Infrared Absolute Spectrophotometer (FIRAS), and Diffuse Infrared Background Experiment (DIRBE)) are very important in measuring the big bang. DMR measures the isotropy of the cosmic background (direction of the radiation). FIRAS looks at the spectrum over the whole sky, searching for deviations, and DIRBE operates in the infrared part of the spectrum gathering evidence of the earliest galaxy formation. By special techniques, the radiation coming from the solar system will be distinguished from that of extragalactic origin. Unique graphics will be used to represent the temperature of the emitting material. A cosmic event will be modeled of such importance that it will affect cosmological theory for generations to come. EOS will monitor changes in the Earth's geophysics during a whole solar color cycle