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Articles 1 - 7 of 7
Full-Text Articles in Operations Research, Systems Engineering and Industrial Engineering
Development Of Availability And Sustainability Spares Optimization Models For Aircraft Reparables, Edmund K.W. Pek
Development Of Availability And Sustainability Spares Optimization Models For Aircraft Reparables, Edmund K.W. Pek
Theses and Dissertations
The Republic of Singapore Air Force (RSAF) conducts Logistics Support Analysis (LSA) studies in various engineering and logistics efforts on the myriad of weapon systems. In these studies, inventory spares provisioning, availability and sustainability analyses are key focus areas to ensure asset sustenance. In particular, OPUS10, a commercial-off-the-shelf software, is extensively used to conduct reparable spares optimization in acquisition programs. However, it is limited in its ability to conduct availability and sustainability analyses of time-varying operational demands, crucial in Operations & Support (O&S) and contingency planning. As the RSAF seeks force structure expansion to include more sophisticated weapon systems, the …
Aerial Refueling Simulator Validation Using Operational Experimentation And Response Surface Methods With Time Series Responses, Alexander P. Hillman
Aerial Refueling Simulator Validation Using Operational Experimentation And Response Surface Methods With Time Series Responses, Alexander P. Hillman
Theses and Dissertations
An important program in the Department of Defense is the KC-46 Supertanker. Dubbed the future of the Air Force's aerial refueling inventory, the KC-46 will replace dozens of ailing previous generation tanker aircraft. The Aerial Refueling Airplane Simulator Qualification document governs the methods by which Air Mobility Command validates its simulators, some of which will be KC-46 simulators in the near future. The methodology set forward in this thesis utilizes historical data of aircraft performance from similar air frames to gain statistical insight into the performance design space of the KC-46. Leveraging this insight, the methodology provides through a framework …
Control Variates And Optimal Designs In Metamodeling, Joshua B. Meents
Control Variates And Optimal Designs In Metamodeling, Joshua B. Meents
Theses and Dissertations
At the heart of most modeling issues is a focus on variance reduction. Experimental designs are chosen based on both efficiency and a variety of variance based criteria. In many situations due to cost, time and availability issues it is beneficial to produce metamodels of simulations. Experimental designs for the region of operability are constructed to collect the simulation output required to construct representative metamodels. Independently, the method of control variates is a well established technique often employed to reduce variance in discrete event simulations. This thesis explores the variance reduction benefits that can be obtained by combining optimal experimental …
Evaluating Courses Of Actions At The Strategic Planning Level, Alhmet Ozdemir
Evaluating Courses Of Actions At The Strategic Planning Level, Alhmet Ozdemir
Theses and Dissertations
Like almost all real life problems, Strategic planning is a good example of a problem with more than one objective. One of the most important steps of strategic planning is to generate and evaluate the courses of actions (COA) which can fulfill the mission and vision of the organization. This is a critical process since it is impractical to start the executed COA over. In this research, value-focused thinking (VFT) is used as a decision analysis tool to assess COAs. A general model is created to select the best COA for strategic planning such as air force operation planning. To …
Vehicle Minimization For The Multimodal Pickup And Delivery Problem With Time Windows, Benjamin A . Clapp
Vehicle Minimization For The Multimodal Pickup And Delivery Problem With Time Windows, Benjamin A . Clapp
Theses and Dissertations
The algorithm proposed here is used for heuristic solutions for the Multimodal Multiple Vehicle Routing Problem with Unloading Capacity, Pickup and Dropoff, and Time Windows, solved so as to minimize the number of vehicles used, subject to varying objective function values for each vehicle. The MVRP is simplified and split into a routing problem and a scheduling problem. The routing problem is addressed by Dijkstra's Algorithm. This generates a new network for the second stage of the algorithm. It is assumed that the shortest path is the correct path to use, and shipments each travel unimodally. The scheduling problem is …
Estimating The Probability Of Being The Best System: A Generalized Method And Nonparametric Hypothesis Test, Aaron M. Lessin
Estimating The Probability Of Being The Best System: A Generalized Method And Nonparametric Hypothesis Test, Aaron M. Lessin
Theses and Dissertations
This thesis provides two new approaches for comparing competing systems. Instead of making comparisons based on long run averages or mean performance, the first paper presents a generalized method for calculating the probability that a single system is the best among all systems in a single trial. Unlike current empirical methods, the generalized method calculates the exact multinomial probability that a single system is best among competing systems. The ability to avoid time consuming empirical estimate techniques could potentially result in significant savings in both time and money when comparing alternate systems. A Monte Carlo simulation is conducted comparing the …
An Examination Of Statistical Rigor Infused Into The Kc-46 Flight Test Program, Sean C. Ritter
An Examination Of Statistical Rigor Infused Into The Kc-46 Flight Test Program, Sean C. Ritter
Theses and Dissertations
The KC-46 program is bringing on-line the replacement aircraft for the KC-135. Although not a new development program, but rather a modification program, there are extensive plans for the flight testing of the KC-46. Recent DoD emphasis mandates the use of statistical design principles for DoD test and evaluation. This project will examine the planned flight test program for KC-46 and reconsider components of that program based on principles of statistical rigor. Of particular focus will be the reliability and maintainability aspects of the flight test program. Current methodology assumes a constant failure rate in all situations, implying that the …