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01 Jan 2014TL;DR: The issues and challenges pertaining to eMaintenance in industrial applications can be facilitated through utilization of an appropriate framework which deals with real-world challenges.
Abstract: Achieving business excellence within industries which utilize complex technical systems requires effective and efficient maintenance. Maintenance is an important enabler of business performance. An effective maintenance strategy creates additional values in an organization’s value-generating process. Establishing an effective and efficient maintenance process is highly dependent on supporting Information and Communication Technology (ICT) infrastructure for information logistics that facilitates maintenance decision support. eMaintenance solutions facilitate effective and efficient management and control of maintenance activities through an enhanced utilization of computing; like estimation of Remaining Useful Life (RUL); reduction of No-Fault Found (NFF); and prediction of fault. eMaintenance solutions enable a seamless integration and fusion of information services provided by information intensive systems with embedded components in order to manage increasing and extensively distributed real-time data collected via different data sources (e.g., sensors). Since, the emerging ‘Internet of Things’ is expecting to dramatically change information systems with inherent embedded components, eMaintenance solutions need to be adapted to this new context to fulfill the overall business requirements on an effective and efficient decision-making process; for e.g.,: real-time analysis based on real-time data and context-aware information logistics. However, development and establishment of proper eMaintenance solutions can be facilitated through utilization of an appropriate framework which deals with real-world challenges. This paper explores some of the issues and challenges pertaining to eMaintenance in industrial applications.
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17 Dec 2007TL;DR: In this paper, the use of a dielectric super-layer is proposed to shape the radiation pattern of each feed so that the spill over from the reflector is reduced without increasing the dimensions of each aperture.
Abstract: The performances of focal plane arrays that implement multi-beam coverage from a single reflector antenna are usually reduced by conflicting requirements on the feed elements. Dense packing is required to minimize the beam separation, while typically large apertures provide the high feed directivity which in turn translates in low spill over losses from the reflector. In this paper the use of a dielectric super-layer is proposed to shape the radiation pattern of each feed so that the spill over from the reflector is reduced without increasing the dimensions of each aperture. A prototype with 19 wave-guides arranged in a hexagonal lattice has been designed. The simulated embedded patterns provide an increase of the edge of coverage gain, with respect to the free space case, of at least 1 dB in an operating bandwidth of ap 6%. Moreover when a frequency and polarization reuse scheme is adopted the increase in the edge of coverage is 2.1 dB leading to a fully efficient use of the reflector.
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08 Jan 201801 Jan 2013
TL;DR: The ISAR measurement technique and analysis at Saab is discussed in this article, where the traditional criterion for far-field distance is not satisfied as the scattering measurements often are conducted for aircraft at 100 m measurement distance.
Abstract: The ISAR measurement technique and analysis at Saab is discussed The traditional criterion for far-field distance is not satisfied as the scattering measurements often are conducted for aircraft at 100 m measurement distance The considerable phase variation over the target that results leads to near-field measurements We have therefore adapted a fast image based compensation method which transforms the ISAR image into the far-field region and in essence renders accurate RCS determinations for the targets RCS measurements at Saab can be dated back to 1986 We will in this paper give an overview of our activities and methodology
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TL;DR: In this paper, a simulation method for predicting the pressure surge in aircraft fuel systems that is suitable for engineering purposes has been developed and the dynamic simulation is a relatively fine, one-dimensional, discrete distribution of the fluid solved with MacCormack's predictor corrector technique.
Abstract: The prediction of the magnitude of the pressure surge in aircraft fuel systems is important from the standpoint of designing systems that will not exceed the maximum surge pressure allowed and also to determine the limit pressure so that lightweight systems can be designed Because aircraft refueling systems are relatively low pressure, the formation of gaseous products, cavitation, introduces severe nonlinearity not only in the form of dampened pressures but also in decreased propagation speed The linear relation between the bulk modulus, pressure, and density that exists in high-pressure systems is made nonlinear by the formation of gases This paper describes a simulation method for predicting the pressure surge in aircraft fuel systems that is suitable for engineering purposes A model for gas formation has been developed The dynamic simulation is a relatively fine, one-dimensional, discrete distribution of the fluid solved with MacCormack’s predictor corrector technique Simulation results are comp
Authors
Showing all 760 results
Name | H-index | Papers | Citations |
---|---|---|---|
Christer Larsson | 64 | 272 | 12916 |
Björn Johansson | 62 | 637 | 16030 |
David C. Viano | 48 | 232 | 8283 |
Thomas Schiex | 47 | 138 | 11031 |
Robin Hanson | 28 | 114 | 3519 |
Per Lötstedt | 28 | 109 | 2960 |
Brigitte Mangin | 26 | 48 | 2652 |
Lars Hanson | 19 | 117 | 1138 |
Carl Gustafson | 17 | 34 | 1035 |
Magnus Carlsson | 16 | 37 | 808 |
Per-Johan Nordlund | 14 | 26 | 2738 |
David Allouche | 14 | 26 | 680 |
Mark A. Saab | 13 | 16 | 1153 |
Andreas Gällström | 13 | 34 | 402 |
Hans Hellsten | 12 | 37 | 549 |