Saab Automobile AB

About: Saab Automobile AB is a based out in . It is known for research contribution in the topics: Radar & Signal. The organization has 760 authors who have published 890 publications receiving 11811 citations.

On Mutual Coupling and Coupling Paths Between Antennas Using the Reaction Theorem

Abstract: The reaction theorem is applied to antenna coupling problems. It is shown that the reaction theorem can be used to calculate the mutual impedance between antennas, when the electromagnetic fields are known on a plane that separates the antennas in two disjoint regions. We also show that coupling paths between the antennas can be visualized by using intermediate results from the reaction theorem. The coupling paths are visualized based on the fields generated by each of the two antennas, and only take into account the energy that is actually transferred between the antennas. The visualization of coupling paths is useful for understanding how the coupling between the antennas is distributed in space.

Device for supplying extra air in exhaust gases from a supercharged Otto engine fitted with a catalytic converter

Abstract: Device for injecting air into an exhaust system fitted with catalytic cleaner (4) for a supercharged Otto engine (2), in whose intake manifold (12) is incorporated a motor driven air compressor (16) operating with internal compression, giving rise to the supercharging. An air bleeding duct (20) is arranged for adjustable air bleeding from the constriction zone of the air compressor and supply of the air as additional air to the catalytic cleaner (40). This air bleeding duct (20) extends from a point (18) in the constriction zone to a point (23) in the exhaust system upstream from the catalytic cleaner (4). In an inlet section (12') of the intake manifold (12), located upstream from the compressor (16), is installed an electronically controlled (26) device (36, 38, 40) for the engine idle control during bleeding of the air via the air bleeding duct (20).

Explicit FE-Formulation of Interphase Elements for Adhesive Joints

Abstract: The potential of adhesive bonding to improve the crashworthiness of cars is attracting the automotive industry. Large-scale simulations are time consuming when using the very small finite elements needed to model adhesive joints using conventional techniques. In the present work, a 2D-interphase element formulation is developed and implemented in an explicit FE-code. A simplified joint serves as a test example to compare the interphase element with a straightforward continuum approach. A comparison shows the time-saving potential of the present formulation as compared to the conventional approach. Moreover, the interphase element formulation shows fast convergence and computer efficiency.

New Graphical Processing Technique for Fast Shadowing Computation in PO Surface Integral

Abstract: This paper presents a new graphical processing technique for fast computation of PO surface integral. In contrast with the original graphical processing approach introduced by the authors in 1993, the new one combines a novel shadowing computation algorithm together with the conventional facet-based Gordon's formula, instead of the pixel-based Asvestas' approximation. The resulting hybrid approach needs more CPU power for very complex radar targets, but is free from the pixel discretization noise inherent to graphical processing. It has the same accuracy as conventional Physical Optics computation, but shadowed facets detection is more than 10 times faster than with the most efficient alternative algorithms of O(N log N) computational cost.