A cascaded two-level power converter is proposed which utilizes two six-transistor inverters and capable of producing voltages are identical to those three-level four-level converters. Since the machine same, performance same as verified through laboratory tests. The advantages disadvantages explored. simpler construct offers more nonredundant switching states per number active semiconductors than standard multi-level

The current waveforms for optimal excitation of surface-mounted permanent-magnet synchronous machines are set forth. Four different modes considered, involving varying degrees minimization RMS and torque ripple. optimized markedly than the traditional sinusoidal or rectangular schemes. Inclusion cogging arbitrary degree ripple generalize this work over that previous authors. An experimental drive a detailed computer simulation verify proposed control

ABSTRACT The systems engineering and product development community can benefit from a methodology that significantly reduce the likelihood of rework when decisions are made within context moderate to high information uncertainty. This condition is predominant in concept design stage early lifecycle stages data scarce, model fidelity low, stakeholder needs requirements expected change. Several quantitative methods used develop, reason, narrow alternatives have been vulnerable requirement...

The method of multiple reference frames is employed in the development a state variable model for brushless DC drives with nonsinusoidal back EMF waveforms. This has desirable features being valid transient and steady-state analysis as well having variables that are constant steady-state. facilitates both nonlinear linear system control design. Computer simulation experimental data included to validate analysis.

The electric power systems in today's US Navy ships supply energy to sophisticated for weapons, communications, navigation and operation. To maintain the availability of connected loads that keep all equipment operational, utilize fuses, circuit breakers protective relays interrupt smallest portion system under any abnormal condition. New techniques are being developed make use advanced monitoring control, automated failure location intelligent reconfiguration restoration. goal is increase...

Abstract Product development efforts now more than ever are in need of methodologies that can address the challenges increased system complexities, shortening time to market, demands mass customization, market instabilities, geographical barriers, improved innovation, and adaptability emerging technologies. To these most companies will make key decisions early product life‐cycle. In this phase there high levels information uncertainty ambiguity. Under circumstances many converge too a point...

Abstract This paper describes research that develops a new framework for performing military effectiveness analyses and design tradeoff decisions. It provides an extensive survey of literature analysis multi‐criteria decision making to develop single consistent philosophy such analyses. is applied requirements case study conventional submarine performed using response surface methods facilitate space visualization maker interaction. Measures merit are developed the study. The resulting...

Finding a quiet, state-of-the-art conventional submarine in large area is challenging task and the potential impacts of threat such can delay operations consume numbers military assets. At theater level, technological impact assessment operational characteristics notional air independent propulsion (AIP) system design performed using mission simulation context. This paper refreshes topic design, provides examples analyses that demonstrate performance current technology, aids for decision...

"In 2004, we start an Initiative—Lean Six Sigma Initiative to achieve our Op Ex Goals. We will be conducting a number of on boarding sessions for with senior leaders in DOD, NAVY, and most importantly Defense Contractors. require training direct reports."John Young, Assistant Secretary the Navy (Research, Development, Acquisition)The announcement NAVSEA's Lean initiative has ushered new era ways that naval combatants are designed, built, operated. As Navy's budgetary constraints increase...

Abstract The US Department of Defense has created a comprehensive systems engineering career competency model for use in defense acquisition. was developed and verified by collaborating team with members from the Office Personnel Management, Navy, Army, Air Force, Marine Corps, Missile Agency to develop verify competencies used engineers. Verification critical allow it be as basis “high stakes” human resource functions all Defense. Deputy Assistant Secretary Research, Development, Test...

Abstract System design and engineering involves making decisions involving multiple stakeholders with diverse and, potentially conflicting, objectives. As more data become available digital engineering, big data, science, trade‐off analytics will be an increasing important tool for engineers. We used a structured literature survey Web of Science key words bibliographic, categorical, bibliometric analysis to answer 14 research questions. our demonstrates, can found in almost every domain....

This paper describes the goals, approaches, initial results, and preliminary implementation of WRT-1006, a multiphase research task within Systems Engineering Research Center (SERC). Evidence across Services industry has affirmed digital engineering is critical practice necessary to support acquisition in an environment increasing global challenges, dynamic threats, rapidly evolving technologies, life expectancy our systems currently operation. Digital updates practices take full advantage...

ABSTRACT Naval ship design is a complex process involving the integration of many subsystems into final which must simultaneously meet cost and effectiveness measures. Alternative designs cannot be built tested due to cost, effort, time involved in construction. While scale modeling continues widely used process, more computer models are being employed generate metrics predict range capabilities for alternative reduced assessing an increased number concept alternatives, as well improved...

Abstract The U.S. Deputy Assistant Secretary of the Navy for Research, Development, Test and Evaluation is sponsoring a strategic initiative led by team from Naval Postgraduate School Systems Engineering Department to implement an overall approach study develop systems engineering career competency model. working in collaboration with Office Personnel Management, Navy, Army, Air Force, Marine Corps, Missile Defense Agency verify competencies used defense engineers. Verification model...

Abstract The US Deputy Assistant Secretary of the Navy, Research, Development, Test and Evaluation, is sponsoring a strategic initiative led by team from Naval Postgraduate School Systems Engineering Department to implement an overall approach study develop systems engineering career competency model. Competencies are defined as knowledge, skills, abilities necessary for engineer perform tasks related discipline. has used framework educational curriculum development purposes. Each associated...

Abstract A platform is the set of elements and interfaces that are common to a family products. Design teams must choose among feasible concepts upon which product could be based, often involving new technologies. Multiple performance objectives need considered. standard approach convert outcomes into financial figures, can then weighed against required investments. However, it not always possible transform (benefits) monetary terms, such as in defense or highly technical projects....

This paper describes the goals, methods, approaches, and preliminary results of a research task within Systems Engineering Research Center (SERC). Evidence across Services industry has affirmed digital engineering is critical practice necessary to support acquisition in an environment increasing global challenges, dynamic threats, rapidly evolving technologies, life expectancy our systems currently operation. Digital updates practices take full advantage computational technology, modeling,...

Last year, the Naval Sea Systems Command (NAVSEA) sponsored Navy’s Center for Innovation in Ship Design (CISD) to establish a framework developing ship design capability readiness levels as part of business case provide incentives naval enterprise invest developing, sustaining, and improving mature capabilities. The authors describe accomplishments thus far note that there is now enough documentation new acquisition programs can specify requirements have valid criteria evaluating...

This paper describes a reusable approach using automatic use case scenario generation to specify system of systems (SoS) behaviors. The leverages the Monterey Phoenix (MP) language and tools which extend current methods significantly by making larger number SoS variants available analysts. Having described how MP structures behavior models accomplish this task in previous papers provides model-building details advice that takes readers through so they may repeat it on their own interest. A...