Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"CONWIP"”.
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Production ramp-up of a hardware startup : simulating CONWIP and CONWIP-build to order production strategies
… to evaluate two base production strategies -- CONWIP and CONWIP-BtO hybrid. This thesis details the modeling mechanisms used to develop the simulation models. Performance trade-offs that exist for these two production strategies with respect to lead time and production floor inventory levels …
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Sequencing policy for a CONWIP production system
… the performance of a constant Work-in-Progress (CONWIP) production system through the sequencing of its backlog list is investigated. The performance measures considered are throughput, optimum WIP level (m*), and flow time. Analysis of the effects of sequence dependent bottlenecks on system …
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Inventory control through a CONWIP pull production system
Production systems such as the CONWIP (constant work-in-process) pull production system have been widely studied by researchers to date. The CONWIP pull production system is an alternative to pure push and pure pull systems that lowers and controls inventory levels and reduces production lead time. …
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Job Sequencing & WIP level determination in a cyclic CONWIP Flowshop with Blocking
A CONWIP (Constant Work-In-Progress) system is basically a hybrid system with a PUSH-PULL interface at the first machine in the line. This research addresses the most general case of a cyclic CONWIP system by incorporating two additional constraints over earlier studies namely; stochastic …
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Measuring impact of CONWIP control on production rate and inventory distribution for a flexible production system through simulation
… types on flexible machines while incorporating CONWIP inventory controls. The production machines, which are separated by individual storage areas for each part type, are modeled as unreliable and operate according to a strict priority sequence. The maximum total inventory of each part type in …
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Making a high-mix make-to-order production system lean
… these issues, cell re-layout is conducted and a CONWIP system is proposed. The cell re-layout started with data collection on current layout, product mix and routings, then the current layout was modified to develop several alternatives, and finally the best alternative was selected based on a …
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Development and Application of a New Modeling Technique for Production Control Schemes in Manufacturing Systems
… used to study the relative performance of push, CONWIP, and kanban control systems. The results show that the card count distribution significantly affects the performance of a kanban system, and that drawing conclusions on kanban performance requires card count optimization. The results also …
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Reduce cycle time and work in process in a medical device factory : scheduling policies for needle assembly machine
… consideration of a mixed dispatching rule and a CONWIP release rule. The mixed dispatching rule reduces WIP level of the system by enhancing the total throughput of the four production routes after the bottleneck (AN machine). The CONWIP release rule further reduces WIP by controlling the total …
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A Comparison of Push/pull Hybrid Manufacturing Control Strategies
… under all the conditions analyzed, although CONWIP is shown to be a robust, consistent, and practical approach. In many cases, no significant difference in performance of selected strategies can be proven. In addition, the manufacturing objective and other factors within the environment, as …
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Production ramp-up of a hardware startup : simulating build to order strategies, capacity estimations and impacts of batching
… and late-stage differentiation, and analyses CONWIP and CONWIP-BtO policies. In contrast, this thesis focuses on the capacity at the current facility and the policies which NVBOTS should look to adopt in the short term. The policies that this thesis considers includes Push, BtO and SxBy …
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Equipment protective capacity optimization using discrete event simulation
… useful for exploring WIP policy alternatives (CONWIP limits vs. drum-buffer-rope starts policies). Reduction of CONWIP limits from 4 days to 3 days appeared robust and generated a 20% decrease in TPT. Equipment protective capacity was optimized. The results indicate that the current gap policy …
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An application of lean principles within a semiconductor manufacturing environment
… WIP management. A pilot implementation of a CONWIP control of inventory demonstrates reductions in cycle time variability and provides a foundation for further improvements. In conclusion, the challenges experienced with changing the manufacturing systems in Sort were largely organizational …
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Applying factory physics to manual assembly at an aerospace fabrication site
… times are increased to stabilize delivery and a CONWIP system is implemented to improve productivity and reduce overtime costs. Subsequent production data show that these changes are effective and that this framework provides successful strategies for value characterization, system stabilization, …
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Preventing WIPlash: Implementation of a Controlled Release Strategy to Improve Shop Performance
… of Constraints focus on the bottleneck, and CONWIP methods of order release, I show that it is possible to achieve lower Work-In-Progress (WIP) levels and improved performance on key metrics relative to a purely push system. Successful implementation of the release strategy required not only …
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Implementing pull production within an aerospace assembly operation
… a constant work-in-process scheduling system or CONWIP. Each project was designed and executed through value stream mapping and continuous improvement. The following discussion focuses on both strategic and tactical challenges of lean transformation because analysis and implementation were …
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Reduced cycle time and work in process in a medical device factory : the problem and a proposed solution
… can obtain further improvement by implementing a CONWIP release rule. For the stocking of NS and SS molded parts, a simple periodic review, base stock inventory policy can effectively reduce the current inventory level by more than 40%, as well as reduce the inventory variation.
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Implementing material and information flow improvements and setup time reduction in automotive gear machining
… and information flow improvements involved a CONWIP-like (CONstant WIP) approach to inventory control. As part of the plant's kaizen process, the setup time reduction activities were intended to begin run size reductions as an enabler for future material and information flow simplification and …
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Improving the efficiency of an automated manufacturing system through a tri-part approach
… WIP is high. Therefore, we suggest adopting a CONWIP policy in the system in order to increase and smooth the output. At the loop level we study the assignment policy. The complexity of this study is highlighted by non-trivial travel time between stations. We build a simulation model in Matlab …
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An analysis of production policy in U.S. Naval Aviation's Primary Flight training
… inventory via a constant work in process (CONWIP) policy to reduce the impacts of rework and dampen sensitivity to resource variations. It also suggests minimally disruptive changes to Primary's architecture that aim to reduce organizational, knowledge, and process complexities while …
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Lot Sizing at the Operational Planning and Shop Floor Scheduling Levels of the Decision Hierarchy of Various Production Systems
… significant improvement over the existing CONWIP-like policy. Furthermore, a reference table for the target operator workload is established with varying weekly demand and lot start rate. The last lot sizing problem that we address has to do with the integration of production and shipping …