An enhanced model for small-signal analysis of the phase-shifted full-bridge converter

This paper presents an in-depth critical discussion and derivation of a detailed small-signal analysis of the Phase-Shifted Full-Bridge (PSFB) converter. Circuit parasitics, resonant inductance and transformer turns ratio have all been taken into account in the evaluation of this topology’s open-loop control-to-output, line-to-output and load-to-output transfer functions. Accordingly, the significant impact of losses and resonant inductance on the converter’s transfer functions is highlighted. The enhanced dynamic model proposed in this paper enables the correct design of the converter compensator, including the effect of parasitics on the dynamic behavior of the PSFB converter. Detailed experimental results for a real-life 36V-to-14V/10A PSFB industrial application show excellent agreement with the predictions from the model proposed herein.1

Development and evaluation of a range anxiety-reducing business model for connected full electric vehicles

This thesis develops and evaluates a business model for connected full electric vehicles (FEV) for the European market. Despite a promoting political environment, various barriers have thus far prevented the FEV from becoming a mass-market vehicle. Besides cost, the most noteworthy of these barriers is represented by range anxiety, a product of FEVs’ limited range, lacking availability of charging infrastructure, and long recharging times. Connected FEVs, which maintain a constant connection to the surrounding infrastructure, appear to be a promising element to overcome drivers’ range anxiety. Yet their successful application requires a well functioning FEV ecosystem which can only be created through the collaboration of various stakeholders such as original equipment manufacturers (OEM), first tier suppliers (FTS), charging infrastructure and service providers (CISP), utilities, communication enablers, and governments. This thesis explores and evaluates how a business model, jointly created by these stakeholders, could look like, i.e. how stakeholders could collaborate in the design of products, services, infrastructure, and advanced mobility management, to meet drivers with a sensible value proposition that is at least equivalent to that of internal combustion engine (ICE) cars. It suggests that this value proposition will be an end-2-end package provided by CISPs or OEMs that comprises mobility packages (incl. pay per mile plans, battery leasing, charging and battery swapping (BS) infrastructure) and FEVs equipped with an on-board unit (OBU) combined with additional services targeted at range anxiety reduction. From a theoretical point of view the thesis answers the question which business model framework is suitable for the development of a holistic, i.e. all stakeholder-comprising business model for connected FEVs and defines such a business model. In doing so the thesis provides the first comprehensive business model related research findings on connected FEVs, as prior works focused on the much less complex scenario featuring only “offline” FEVs.

A model and an algebra for semi-structured and full-text queries

The need for a convergence between semi-structured data management and Information Retrieval techniques is manifest to the scientific community. In order to fulfil this growing request, W3C has recently proposed XQuery Full Text, an IR-oriented extension of XQuery. However, the issue of query optimization requires the study of important properties like query equivalence and containment; to this aim, a formal representation of document and queries is needed. The goal of this thesis is to establish such formal background. We define a data model for XML documents and propose an algebra able to represent most of XQuery Full-Text expressions. We show how an XQuery Full-Text expression can be translated into an algebraic expression and how an algebraic expression can be optimized.

Comparison of dynamic effects of high-speed traffic load on ballasted track using a simplified two-dimensional and full three-dimensional model.

The vertical dynamic actions transmitted by railway vehicles to the ballasted track infrastructure is evaluated taking into account models with different degree of detail. In particular, we have studied this matter from a two-dimensional (2D) finite element model to a fully coupled three-dimensional (3D) multi-body finite element model. The vehicle and track are coupled via a non-linear Hertz contact mechanism. The method of Lagrange multipliers is used for the contact constraint enforcement between wheel and rail. Distributed elevation irregularities are generated based on power spectral density (PSD) distributions which are taken into account for the interaction. The numerical simulations are performed in the time domain, using a direct integration method for solving the transient problem due to the contact nonlinearities. The results obtained include contact forces, forces transmitted to the infrastructure (sleeper) by railpads and envelopes of relevant results for several track irregularities and speed ranges. The main contribution of this work is to identify and discuss coincidences and differences between discrete 2D models and continuum 3D models, as wheel as assessing the validity of evaluating the dynamic loading on the track with simplified 2D models

Operator's organizational, DS, GS, and depot maintenance manual : tractor, full tracked, D.E.D., 7500 lb. min. drawbar pull, w/bulldozer blade, back rip scarifier, J.I. Case model M-450, FSN 2410-935-0714.

"December 1969."

Hand receipt covering contents of components of end item (COEI), basic issue items (BII), and additional authorization list (AAL) for tractor, full tracked, low speed, diesel engine-driven-medium-drawbar-pull : model, tractor with ripper ... NSN, 2410-01-223-0350 ....

"November 1992."

Unit maintenance direct support and general support maintenance repair parts and special tools lists : tractor, full tracked, low speed, diesel-engine driven, sectionalized and non-sectionalized w/angle dozer, winch and rops, model D5BNS, NSN 2410-01-1267-7902 ....

"September 1992."

Field and depot maintenance manual : engine, gasoline, "V" type, air cooled, 12-cylinder, fuel injected, supercharged, -2805-695-6237, (Continental model AVSI-1790-6) and fuel injected, (unsupercharged), -2805-293-9662, (Continental model AVI-1790-8) : end item application, tank, combat, full tracked, 90-mm, M48A2, (TM 9-2350-208) ....

Includes index.

Field and depot maintenance manual : engine, gasoline, fuel injected, supercharged, horizontal-opposed, air cooled, six cylinder, assembly-2805-528-6015, (Continental model AOSI-895-5 and AOSI-895-5M) : end item application : gun, self-propelled, full tracked, twin 40-mm, M42A1 (TM 9-2350-202), howitzer, self-propelled, full tracked, 105-mm, M52A1 (TM 9-2350-209) ....

Includes index.

Unit maintenance repair parts and special tools lists : tractor, full tracked, low speed, heavy drawbar pull, (size T-11), w/angle dozer, winch and rops, Caterpillar model D8K-8A-58 (CCE), NSN 2410-00-574-7597 and w/bulldozer (semi-u-tilt), ripper and rops, Caterpillar model D8K-8S-8 (CCE), NSN 2410-00-574-7598.

Includes indexes.

Direct and general support and depot maintenance repair parts and special tools lists : tractor, full tracked, low speed : diesel engine, medium drawbar pull, oscillating track, 74-in. minimum gage, power shift transmission, w/bulldozer, hydraulic-tilting, w/backrip scarifier, w/winch, reversible, rear, 1 drum (Allis-Chalmers model HD16M) ....

"April 1972."

Organizational maintenance repair parts and special tools lists : tractor, full tracked, low speed, diesel engine driven : medium DBP, oscillating track, 78 inch gage, Army model D7E (NSN 2410-00-782-1130), w/winch (NSN 2410-00-926-3697), w/ripper (NSN 2410-01-050-9628), w/winch and ROPS ....

"February 1985."

Operator's manual : tractor, full tracked, low speed, DED, medium drawbar pull, oscillating track, 78 in.-gage (Caterpillar model D7F) with ripper, FSN 2410-177-7283, with winch, FSN 2410-177-7284.

"12 November 1980"--Change no. 3.

Operator's manual for tractor, full tracked, low speed, DED, medium drawbar pull, SSN M061 : tractor, model D7G, tractor with ripper, NSN 2410-01-223-0350 ... tractor with winch and winterized cab, NSN 2410-01-253-2117.

"20 January 1989."