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.

Gearbox for motor vehicle

Abstract: Une boite de vitesses mecanique, a vitesses etagees, comprend une pluralite de paires de pignons (25-34) qui cooperent et sont disposees sur un arbre d'entree (19) et un arbre de sortie (22) et un premier arbre lateral (24). A mechanical gearbox, to stepped speeds, includes a plurality of gear pairs (25-34) which cooperate and are arranged on an input shaft (19) and an output shaft (22) and a first lateral shaft ( 24). Les paires de pignons peuvent etre engrenees selectivement afin de donner differents rapports de vitesse. The pairs of gears can be meshed selectively to provide different gear ratios. En outre, la boite de vitesses comprend un pignon (39) dispose sur un deuxieme arbre lateral (40), qui est utilise a la fois pour creer une marche arriere et pour transmettre une force d'entrainement au premier arbre lateral (24). In addition, the gearbox comprises a gear (39) disposed on a second side shaft (40), which is used both to create a back and to transmit a driving force to the first side shaft (24). La boite de vitesses peut ainsi etre concue avec un faible encombrement axial, meme lorsque la boite comporte de nombreuses vitesses etagees. The gearbox can be designed with a low axial space, even when the box has many storied speeds.

Orbital Drilling - Implementation and Evaluation

Abstract: Building aircraft is a challenging field An aircraft has a life expectancy of 40 years, compared to just 10 years for a car Given the vibrations of flying at close to Mach one at an altitude of 10,000 meters, these machines must function flawlessly in a tough environment This demands high quality in the assembly processes The typical part joining process in the automotive industry is welding, whereas in the aircraft industry, assembly is made through drilling, followed by fastening The typical tolerances for part location in aircraft assembly, as well as for hole drilling, is +/- 02 mmThis dissertation discusses the use of industrial robots, widely used for welding and pick-and-place operation for automotive industry, in the automation of the aircraft industry, and specifically for the drilling of holes in the assembly process of airframe parts The dissertation presents how a new drilling technology called orbital drilling is incorporated with and industrial robot Orbital drilling reduces the cutting forces up to ten times compared to conventional drilling using a spiral cutterThe robot is also utilized for performing changeovers between different airframe structure types A novel jointed reconfigurable tooling system called Affordable Reconfigurable Tooling (ART) is presented, which uses the robot to reconfigure flexible fixture modules The ART system can also be rebuilt, which means that the tool is dismantled and reused for a completely different product family (eg wings, fins or fuselage sections) This is made possible through a modular framework, ie not welded as with conventional tooling, but rather jointed by screwsRobots, originally developed for the automotive industry, have an accuracy which is ten times less accurate than that required for aerospace applications To help meet this limitation in the use of robots in aircraft assembly, an additional metrology system, used in the aircraft industry for calibrating assembly tooling, is integrated into the robot controller The feedback loop enables the robot to be positioned to ±005 mm absolute accuracy This integration is made possible by existing embedded software packages for the robot and the metrology systemThe processes in the system are programmed in a software package with an intuitive user interface in a 3D-environment, normally used for the offline-programming of robots in automotive industry The planning is intuitive, and an approach towards a process planning abstraction level is presented where processes are defined directly on the coordinate frames constituting the robot trajectories and manual operations Tolerance on accuracy requirements are dynamically programmed in the same environment The metrology system, working online with the robot controller, eliminates most of the calibration work required in traditional robot programming Changes in the operation planning take less than a minute to run physically with the best tolerance

Wideband mm-Wave Transition Between a Coupled Microstrip Line Array and SIW for High-Power Generation MMICs

Abstract: A compact wideband transition between an array of microstrip lines (MLs) and a single substrate integrated waveguide (SIW) is presented The spatially distributed fundamental SIW mode is excited by an array of parallel and strongly coupled MLs The proposed configuration is optimized by minimizing the “active” reflection coefficient at each ML port Signals are transferred with nearly uniform power distribution across the ML ports, which facilitate an effective utilization of power amplifiers once interconnected Measured results of the proof-of-concept demonstrator are in good agreement with simulations The proposed configuration is capable of generating more power per footprint size relative to a single microstrip-to-SIW transition while offering a 50% bandwidth At the same time, the compactness of the ML-to-SIW transition makes it suitable for tight integration with monolithic microwave integrated circuits and applications in wideband array antennas