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DSpace at MIT (72.707 recursos)
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Mechanical Engineering - Master's degree

Mostrando recursos 1 - 20 de 2.636

1. System improvements in valve manufacturing cell at Waters Corporation - Gupta, Snegdha
This thesis addresses the challenge of improving on-time delivery performance of stators in the high mix valve manufacturing cell at the Milford facility of Waters Corporation with a focus on efficient line design without exceeding the average WIP levels observed in the current system. A detailed study of the current process was done and it was concluded that the poor on-time delivery performance of stators to the assembly department could be attributed to the unacceptably long fabrication lead times-due to the long waiting induced by the fabrication of a high mix of 28 different types of stators- and the lack...

2. Design and process optimization of a hot embossing machine for microfluidics with high aspect ratios - Kalsekar, Viren Sunil
Microfluidics is a growing technology in the field of medical diagnostics. Daktari Diagnostics is a startup located in Cambridge, MA that seeks to introduce a lab-on-a-chip device for monitoring HIV in patients. This work investigates hot embossing as a prototyping process for Daktari's microfluidic device. A hot embossing system was designed and built for the purpose of prototyping a critical feature of their microfluidic network. The machine was designed for an embossing area of 6 square inches, and was found to have a maximum positional repeatability of 43 microns. The purpose of this research was to find the capabilities of...

3. Prioritization and control of order picking system - Kanburapa, Prachyathit
Order Picking System (OPS) efficiency at a warehouse was studied with the goal of reducing production order lead time to 8 hours. Current material flow system and strategy were studied through interviews with personnel involved. In addition, data extraction and analysis were performed using the company's SAP Extended Warehouse Management (EWM) database to analyze the past performance in the warehouse. Three areas for improvement are recommended. First, updating the Vertical Lift Module (VLM) picking machine to operate in the First-In-First-Out manner will solve the picking idle time in other areas with an expected average time savings of 20 minutes per...

4. Design and manufacturing analysis of resonantly coupled circuits and other components used for applied wireless power transmission : application analysis - Krogman, Mitchell S. (Mitchell Spencer)
This thesis describes the analysis of a locking mechanism designed by ProTeqt Technologies. More specifically, the analysis considers the mechanism after the implementation of a resonantly coupled circuit used to receive and transmit wireless energy. Ultimately, the wireless energy is used to generate heat, which in turn causes a polymeric material to expand, thereby creating a mechanical force to disengage the locking mechanism. The analysis considers the force generated through wireless transmission, as well as the forces required to disengage the locking mechanism. The general physics of wireless energy transmission through resonant coupling is presented, as well as design specifications...

5. Design method of a modular electronic printed circuit board testing system - McCalib, David, Jr
The failure rate of the printed circuit board electronic testing process is higher than acceptable at a Lenze Americas factory. This thesis will understand the root causes of failure, and use system engineering methods to decide what course of action should be taken. A Tradespace analysis is used to help decompose some of the complexity into a visualization that simplifies the decision process. The Tradespace analysis suggests that more utility can be achieved by upgrading the design of existing test fixtures versus purchasing off of the shelf solutions. The second phase will identify a design concept, offer specific design solutions,...

6. Hot embossing as a method for rapid prototyping microfluidic devices - Nguyen, Khanh H. (Khanh Huy)
Hot embossing is a growing technology proven to be capable of reproducing micro-scale features on thermoplastics and can be an effective process for rapid prototyping microfluidic devices with high aspect ratio micro features. Advantages of this manufacturing process can include tooling flexibility, fast production time, low capital cost and a vast selection of production materials. A greater understanding on the micro feature transferring capabilities and use limits of tools are needed so that hot embossing may advance to becoming a practical technique for producing microfluidic parts. This work focuses on both the design and analysis of a hot embossing system...

7. Production line design and system analysis for new product introduction in electronics manufacturing - Phadnis, Vrushank S. (Vrushank Shripad)
In this research, a system level analysis was performed on a one piece flow layout design for a factory manufacturing AC motor control drives. The requirement was to create a layout for a new product while integrating existing manufacturing lines. Analytical methods and simulation techniques were used to validate the performance of the proposed line. The thesis outlines the manufacturing processes required to make the new product and presents an approach used to predict the new line's performance. A hybrid approach was employed wherein analytical methods were used to create a baseline plan of the production line. The baseline requirements...

8. Design and measurement analysis of hot embossing system for high aspect ratio microfluidics - Ragosta, Nicholas (Nicholas Hiroshi)
Microfluidics is a growing technology in the arena of medical diagnostics. Daktari Diagnostics is a startup located in Cambridge, MA that seeks to introduce a lab-on-a-chip device for monitoring HIV in patients. This work investigates hot embossing as a prototyping process for Daktari's microfluidic device. A hot embossing machine was designed and built for the purpose of prototyping a critical feature of their microfluidic network. The machine was designed for an embossing area of 6 square inches, and was found to have a maximum positional repeatability of 43 microns. The microfluidic feature that was prototyped is known as the assay...

9. Analysis and design of resonant inductively coupled circuits : application to benefit denial solutions for the retail industry - Rony, Amaury
ProTeqt develops benefit denial solutions that are electromagnetically deactivated. A magnetic field from the deactivation tablet inductively heats an enabler that provides the proper force to disengage the locking mechanism. Its latest design was not functional at one inch above the deactivation tablet, because of significant efficiency losses in the electromagnetic energy transfer. This is problematic when the product's package is thick. In order to improve the maximal functional distance, an LC circuit is inserted inside the locking device. This thesis describes the optimization and integration of the circuit, used as a weakly coupled electromagnetic resonator in wireless energy transfer....

10. Materials lead time reduction in a semiconductor equipment manufacturing plant : process flow planning - Surveski, Ryan
Process flow at a semiconductor tool manufacturer was studied with the goal of reducing production order lead time to 8 hours. Current material flow systems were studied and interviews with the involved personnel were conducted. Additionally, data was extracted and analyzed from the company's SAP Extended Warehouse Management database to analyze the past performance of the material flow group. Three areas for improvement were analyzed and recommendations were made regarding each area. First, it is recommended that an additional truck driver is hired and that a final delivery is made after the last warehouse worked stops working. This will reduce...

11. Materials lead time reduction in a semiconductor equipment manufacturing plant : warehouse design and layout - Ukpebor, Obehi
The warehouse layout and operations of a semiconductor tool manufacturer were studied with the objective of reducing the lead time for parts ordered from the warehouse to 8 hours. Current order fulfillment operations were studied and interviews with involved personnel were conducted. Additionally, data was extracted and analyzed from the company's SAP Extended Warehouse Management database to analyze the past performance of the warehouse operations. Three main areas for improvements were analyzed and recommendations were made regarding each area. First, it is recommended that a kit of parts ordered should be sent immediately the constituent parts are consolidated and the...

12. Oil palm phenolics suppresses oxidative stress and inflammation - Sundaresan, Abaya Meenakshi
Water-soluble Oil Palm Phenolics (OPP), derived from Elaeis guineensis, contains a unique blend of plant phenolics. Recent cell and animal studies have demonstrated positive health benefits in a number of different organ systems, with almost no noticeable side effects. Its efficacy and non-toxicity may be in large part due to several active polyphenolic ingredients, rather than a single one. In this work, some of the coordinated mechanisms through which OPP functions to protect glial cells and chemical systems from oxidative stress and inflammation were studied. The antioxidant effects of OPP were analyzed based on its ability to act as a...

13. Component-derived manufacturing yield prediction in circuit card design and assembly - Trinh, Stephen
Circuit card manufacturing can be a highly risky and volatile proposition due to the placement of hundreds of small, high value components. Operator mistakes, design errors, and defective parts lead to thousands of dollars in troubleshooting and rework costs per product. Raytheon Integrated Defense Systems (IDS) Circuit Card Assembly (CCA) manufactures highly complex circuit cards at a high mix / low volume scale for various purposes. Due to the high input variability and small production lot sizes of this level of circuit card manufacturing, historical trending and defect mitigation is difficult, causing a significant portion of CCA's manufacturing costs to...

14. Design of a folding antenna-integrated micro UAV - Vu, My H
Micro-UAV devices can be used for a variety of purposes. This project is concerned with the design of such a device that will be used for high altitude antenna calibration. Such a UAV requires that an omni-directional antenna be integrated into the frame of the device to reduce signal interference. The device is to fold into a flare cartridge and withstand high deployment forces out of an aircraft. Design requirements include a rectangular working volume of 1.89" X 2.44" X 7.04", a minimum additional payload of 70 g, hang time requirements, and antenna operating frequencies. A standard design process was...

15. Engineered, perfusable, human microvascular networks on a microfluidic chip - Whisler, Jordan Ari
In this thesis, we developed a reliable platform for engineering perfusable, microvascular networks on-demand using state of the art microfluidics technology. We have demonstrated the utility of this platform for studying cancer metastasis and as a test bed for drug discovery and analysis. In parallel, this platform enabled us to study, in a highly controlled environment, the physiologic processes of angiogenesis and vasculogenesis to further elucidate their underlying mechanisms. In addition to using our platform for real-time observation of physiological processes, we also took advantage of the ability to influence these processes through precise control of the extracellular environment. By...

16. A design tool for reusing integration knowledge in simulation models - Han, Sangmok
In the academic field of computer-aided product development, the role of the design tool is to support engineering designers to develop and integrate simulation models. Used to save time and costs in product development process, the simulation model, however, introduces additional costs for its development and integration, which often become considerably large due to the fact that many, complex simulation models need to be integrated. Moreover, the result of integration and the effort taken during the integration process are often not reused for other product development projects. In this paper, we attempt to develop a design tool that can capture...

17. Three dimensional printing by vector printing of fine metal powders - Seluga, Kristopher J. (Kristopher Joseph), 1978-
by Kristopher J. Seluga.

18. Analysis of crimping mechanism in stuffing box crimper. - Kouguchi, Noriyuki
Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Thesis. 1966. M.S.

19. Design and manufacturing analysis of resonantly coupled circuits and other components used for wireless benefit-denial system - Zhu, Tianyu, M. Eng. Massachusetts Institute of Technology
A new benefit-denial system using RFID technology and inductive heating is under development by ProTeqt Technologies. During the deactivation process, an enabler receives electromagnetic waves and turns the energy to heat, causing the polymeric material inside to expand and create force. An LC circuit in the locking mechanism, acting as a weakly coupled electromagnetic resonator, is used to improve energy transfer efficiency. The design of the LC circuit, as well as the measurement of the resulting force is presented. Due to the manufacturing variability of each component, the force generated by the enabler in the lock is uncertain. In the...

20. Optimizing the economic efficiency by micro-drill life improvement during deep-hole drilling in the 212-Valve manufacturing process - Zhuang, Yan, M. Eng. Massachusetts Institute of Technology
The micro-drilling process by robodrills in the production of valves at Waters Corporation is the bottleneck caused by the short drill life. This thesis analyzed the chip formation and removal during the process to improve the tool life. The effects of the tool materials, geometry and peck drilling procedures were investigated. Based on these studies, a new micro drill bit, TYl 30, was selected from the commercial market and the test results for drilling 0.2794 mm holes in the workpiece made of 316-stainless steel showed that it lasted for 120 holes, 5 times longer than the currently used drill bit....

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