Saab AB

About: Saab AB is a company organization based out in Thun, Switzerland. It is known for research contribution in the topics: Signal & Antenna (radio). The organization has 862 authors who have published 928 publications receiving 8807 citations. The organization is also known as: Saab AB & Svenska Aeroplan AB.

Arrangement for charging energy in an energy-storing arrangement such as an ignition capacitor

Abstract: The present invention provides an arrangement for charging energy in an energy-storing arrangement such as an ignition capacitor in electronic ignition systems. To reduce the risk of malfunction, direct-current-controlled breakers controlled by environmental conditions, normally occurring on the primary side of a transformer (4) in series with the primary winding (5) have been replaced by a frequency divider (2) controlled by environmental conditions. This frequency divider divides down a signal supplied by a signal generator (1) to a pulse train with a lower frequency which controls a breaker (7) connected in series with the primary winding (5) of the transformer.

Hot drape forming by means of a stiffness controlled vacuum bag

Abstract: The invention relates to an apparatus and a method of conforming a blank (15) onto forming surface sections (5) of a forming tool (7) by drawing a first vacuum against an elastic forming medium (1) for transmitting forming forces from the elastic forming medium (1) to the blank (15), the method includes the steps of evacuating the elastic forming medium (1) with the first vacuum for allowing the elastic forming medium (1) to stretch and conform the blank (15) to the forming surface sections (5). The elastic forming medium (1) comprises at least one void (3), and a step of applying a second vacuum to the void (3) is performed for achieving a stiffened section (4) of the elastic forming medium (1) corresponding with the location of the void (3) and corresponding with, when the elastic forming medium (1) after the completion lies against the forming tool (7) having the blank (15) in between, a forming surface section (5) of the forming tool (7) where the blank (15) requires a forming force (F) being larger than that of surrounding sections (17) of the elastic forming medium (1).

CFD Analysis of an Avionic Module for Evaluating Power Distribution as a Thermal Management Measure for a Double-sided PCB

Abstract: Thermal design aspects of an avionic module including fully populated PCBs housed in a sealed enclosure have been studied by means of computational fluid dynamics. Effect of power distribution between the sides of a double-sided PCB on the case temperature of surface-mounted components has been investigated within a proposed simulation strategy. Simulation-based guidelines have been developed for thermal design of avionic modules, regarding preferable power configuration on a double-sided PCB, representing an alternative approach to thermal management, as compared to introducing additional cooling devices.

Safe transmission using non-safety approved equipment

Abstract: A communications method useable to safely communicate a message or a signal from a first safety approved entity (210) to a second safety approved entity (230) via a third, non-safety approved entity (220) comprising that each command is sent with the aid of a command message from the first to the second entity, an acknowledge message from the second to the first entity, and a go-ahead message from the first to the second entity.

A stepped frequency radar device

Abstract: A radar device (100) comprising transmit and receive parts, and a control unit (CU). The transmit part includes means (WG) for generating a signal within a certain band, and the receive part comprises a filter (AAF), an AD-converter (ADC) and a Fourier transform unit (FFT1). The transmit part generates a group of signals, each having a first bandwidth between a first and a second frequency, in such a way that a larger bandwidth (B1-B4) is covered by the group. The receive part is open over said larger bandwidth (B1-B4) during reception of each signal in said group, and the transmit part comprises means (PAD, FFT2) for creating FFT-copies of the received signals and means (CONJ) for creating conjugates of said copies. The receive and transmit parts comprise means (EXTR) for extracting data from the FFT from the first bandwidth covered by a received signal, and the radar device comprises means (DIFF) for correlating said extracted FFT-data.