Showing papers by "Saab AB published in 2002"

Device for bracing a shell in an aircraft fuselage

Abstract: A device for bracing a shell surface (1) in an aircraft fuselage against deformations and consisting of a continuous profile that is arranged so as, after conformation, to be mounted against the shell surface. Notches (6) are spaced at regular distances apart from each other in at least a portion of the profile. The notches (6) extend through a base surface (3) in the profile, and through an intermediate part (4) perpendicular to the base surface (3). The notches (6) are delimited upwardly by an upper surface (5) that is not encompassed by said notches (6).

Catastrophizing and health-related quality of life: a 6-year follow-up of patients with chronic low back pain.

Abstract: Catastrophizing and Health-Related Quality of Life: A6-year Follow-up of Patients with Chronic Low Back Pain

Automatic air collision avoidance system

Abstract: This paper presents an algorithm for an automatic air collision avoidance system being developed by the US Air Force and its Swedish counter part, Forsvaret Materielverk (FMV) The algorithm uses optimal coordinated escape maneuvers to avoid mid-air collision, while satisfying the imposed system requirements In addition, the algorithm simultaneously accommodates multiple aircraft on a collision course by activating coordinated escape maneuvers On the other hand, the algorithm suppresses activation of escape maneuver to allow close formation flight and rejoining The algorithm is designed to operate safely despite failures such as GPS or data link dropout

Affordable Reconfigurable Tooling

Abstract: Since the early days of aircraft assembly, welded steel structures called Conventional Tooling has been used for positioning and holding parts in place during assembly. This paper presents a new tooling concept called Affordable Reconfigurable Tooling, where a robot is not only used for drilling and riveting but also for reconfiguring the tool itself. The concept consists of modular units that can either be reconfigured between products of the same family of assembly or rebuilt between product families. The research is part of an ongoing EU-founded aircraft industry project – ADFAST*.

Method and arrangement for indicating hits

Abstract: The invention relates to a method and an arrangement for indicating that a target (1), such as a vehicle, has been hit. The target is provided with information on the weapon action, and a light source indicates a hit. The information can be made available by direct electromagnetic transmission, for example via radio, or by means of one or more strips (9-11) with detectors (13) being arranged on the target (1). In the latter case, the detectors detect incident illuminating electromagnetic radiation, and a light source indicates a hit when the incident radiation satisfies defined detection criteria. According to the invention, the light source is mounted directly in one or more strips (12) which in the present case can be the same as the detector strips and consist of distributed light points preferably in the form of light-emitting diodes (14). In this way, a protected and integrated solution is obtained which has little effect on the shape of the target.

Method for discharging countermeasure means, rocket launcher, and dispenser arrangement

Abstract: The invention relates to a method for discharging countermeasure means, a rocket launcher (1), and a dispenser arrangement (10). According to the invention, the space (9) for one or more rockets in a rocket launcher (1) is used as a carrier for a dispenser arrangement (10) for countermeasure means. The dispenser arrangement is designed with one or more cylindrical sections (11, 12.2, 12.5) specially adapated to the rocket space in the rocket launcher. By virtue of the invention, equipment already adapted to aircraft can be made use of in supplementing the countermeasure equipment of the aircraft.

Device and method for a drive shaft

Abstract: The invention concerns a method and device for a drive shaft (6), which drive shaft is arranged at its first end for operative connection with a drive mechanism (4) that applies a first torque to the drive shaft, and which drive shaft is arranged at its second end for operative connection with a mechanism (9) driven by the drive shaft. The invention is characterized in that the drive shaft (6) has, at at least one of its ends, a notch (15) arranged so as to receive a connector (12, 10) for the associated mechanism, and in that the wall (7) of the notch is made, in at least one area at said end, of fiber composite material comprising a first set of fibers that extends into the notch wall in a direction falling roughly within a range of +( 10° -80°) relative to the longitudinal direction of the drive shaft, where the positive range of angles indicates that the fibers are oriented in the first direction of torque. The first torque is thereby arranged so as to bring about transverse contraction of the shaft in said notch area so as to impose a clamping grip on the associated mechanism connector.

Method and device for fabricating composite materials and bonded sheet items

Abstract: This invention refers to a method and a device for use in connection with the fabrication of multilayer products (8) such as composites and bonded multilayer sheet products, etc. by means of the so-called 'bagging technique,' to increase the compressive pressure (P) on the product being created beyond normal atmospheric pressure. In the bagging technique, which is used to join a plurality of different material layers with one another to form a unit via polymeric binder layers, atmospheric pressure is normally used to press the various objects together in that they are enclosed in a depressurized gas-impervious bag (9, 21) while the various layers are joined to form a unified product. According to the invention, the atmospheric pressure acting upon the outside of the bag is adsorbed by a first material surface (3 + 4 + 5) that is larger than the surface of thze multilayer product whose intermediate binder layers are to be caused to join together, while a second material surface (3) facing the opposite direction is used to transfer said composite pressure load (P) to the product to be fabricated. The invention also includes a method and a device for distributing the pressure load (17, 18, 10) laterally in connection with the fabricatoin of e.g. a U-channel-shapped object with the help of the wedge effect.

Noise modulated remote distance measurement

Abstract: The invention relates to remote distance measurement by means of a transmitted noise modulated probing signal (E), whereby at least one of a distance (Y(t)) and a velocity (V(t)) in relation to a signal transceiver (200) is determined. The probing signal (E) is generated on basis of at least one first noise signal (x1(t), x2(t)). The transmitted signal (E) is presumed to be reflected to the signal transceiver (200) via at least one signal reflecting object in the form of an information carrying signal (e). This signal thus constitutes a delayed and possibly doppler shifted version of the transmitted signal (E). Moreover, according to the invention, a second noise signal (x2(t)) is added either to the probing signal (E) before it is transmitted or to the information carrying signal (e) before information pertaining to the reflecting object is derived there from. A primary signal (P1(x1)) is generated, which is based on the first noise signal (x1(t)) and a secondary signal (P2(x1, x2)) is generated, which is based on the information carrying signal (e). Thanks to the contribution from the second noise signal (x2(t)) the subsequent signal processing of the primary signal (P1(x1) and the secondary signal (P2(x1, X2)) can be performed with a high linearity at the same time as a comparatively simple equipment can be utilized for digitizing (240) signal components (SI, SQ; RI, RQ), which have been demodulated from the primary signal (P1(x1)) and the secondary signal (P2(x1, x2)) respectively. The solution according to the invention is also applicable at remote distance measurement by means of a digital group antenna system.

Metal-composite laminates and a method for fabricating same

Abstract: This invention concerns a method for reducing the weight of metal-composite laminates that consist of two or more metal foil layers (1) and the polymeric binder layers (2) that hold these metal foil layers together and contain fiber reinforcement (3) designed in view of the intended area of application for the product. The desired weight reduction is achieved according to the invention in that at least parts of the fiber reinforcement (3) are made from hollow fibers, i.e. consist of tubular fibers, each of which contains at least one longitudinal internal hollow channel. The invention also includes products fabricated in accordance with said method.

Aircraft collision avoidance calculation method and system

Abstract: The present invention relates to a method of calculating a trajectory for an escape maneuver of an airborne vehicle from a determined starting point. The method comprises the steps of determining position, velocity and acceleration data for the starting point and from said data determining the escape maneuver. The method is characterized in that the escape maneuver trajectory is modeled as one or more analytic curves in three dimensions following after each other. The invention further relates to an air collision avoidance system and a ground collision avoidance system comprising said method for calculating escape maneuvers.

System and a method for navigating a vehicle

Abstract: In a system for navigating a vehicle according to the appearance of the surface region over which it moves there are at least three devices adapted to carry out a position determination of the vehicle according to a predetermined algorithm as well as members adapted to compare the positions determined by the devices and at a substantial deviation of any position from the other positions assume that this is erroneous and form an average of the other positions as the correct position of the vehicle.

Method and device for displaying objects

Abstract: The invention concerns a method and a device for displaying surrounding objects on a display surface 1. A first number of objects within selected geographic surroundings are displayed in perspective view 2 on the display surface. Objects that are located outside of the selected geographic surroundings, but within a predetermined distance, are represented by symbols 5 that are displayed in a frame 3 on the periphery of said display surface 1. The placements of the symbols 5 along this frame 3 provide a two-dimensional representation of the actual positions of the objects.

System for aligning a firing simulator and an aligning unit for the same

Abstract: This invention concerns a system for aligning a simulator (3) arranged for firing and mounted on a weapon. The simulator has a radiation source (8) arranged so as to emit a beam along a simulation axis, and adjusting means (10) for adjusting the simulation axis so that it is aligned with the weapon sight. The system is characterized in that it includes a sighting mark at which the weapon sight is to be aimed during alignment, and means arranged in connection with the sighting mark to emit a beam along an axis representing an aligned simulation axis. The system further includes an aligning unit (14) that is deployable at the simulator and in which at least a first part of the beam from the element (8) is reflected along an axis representing the current position of the simulation axis. Position-indicating means (18) are arranged so that the beam along the axis representing the aligned beam strikes the position-indicating means (18) at a point representing a set-point value for the simulation axis, and so that the beam along the axis representing the current simulation axis strikes the position-indicating means at a point representing an actual value for the simulation axis.

Device for overvoltage protection in a wind turbine

Abstract: The invention concerns a device for overvoltage protection in a wind turbine comprising a drive shaft (7) that is arranged to operatively connect one or a plurality of rotor blades (12) to a generator (9). The invention includes a drive shaft (7) containing a core of carbon fiber composite (7a) with a longitudinally through-passing cavity. In one end a connector (5) for a hub (4) that connects the rotor blades (12) is arranged to be introduced, and in the other end a coupling part (10) to the generator (9) is arranged to be introduced. An inner layer of fiberglass composite (7b), which is integrated with a core of carbon fiber composite (7a) in the drive shaft (7), surrounds the cavity and is arranged so as to electrically insulate the connector (5) and the coupling (10) from the drive shaft (7), which is electrically connected to ground.

A sensor integration technique for preventing collisions between air vehicles

Abstract: Autonomous control of unmanned aerial vehicles (UAVs) is a goal for the US Air Force in the future However, flying multiple unmanned vehicles in the same tactical airspace with manned fighters or operating these vehicles in commercial airspace increases the likelihood of collisions Therefore, the development of an automatic air collision avoidance system will be a required step in achieving this goal

Ammunition device with two active charges

Abstract: The invention relates to an ammunition arrangement. The ammunition arrangement comprises at least two active parts (2, 3), each with its own active charge (4, 6), arranged axially one behind the other. In order to make large holes in walls and the like without problems of great weight, the second active charge (6) is designed to act essentially in the radial direction at right angles to the direction of movement of the active charge.

Method for reinforcing a double-shell structure

Abstract: The invention concerns a method for reinforcing a double-shell structure in which a cellular core (2) is arranged between a first shell (5) and a second shell (6). In the method according to the invention, at least one cavity is formed in the double-shell structure from an opening in the first shell into the cellular core (2) so that the cavity substantially extends through the cellular core (2) to the second shell. Fixative (8) is injected into the cavity. A stiff bar (7) is introduced into the cavity, whereupon excess fixative (8) is allowed to pass out of the cavity. Finally, the fixative left in the cavity is cured.

System and method for combat simulation

Abstract: The invention relates to simulation of effects in a combat environment, wherein personnel, vehicles and buildings are exposed to simulated fire from military weapons. Direct fire and indirect fire are simulated by means of at least one of light rays and radio waves. Effects of attacking fire are registered by means of a target object device, which includes sensors adapted to detect the light rays respective the radio waves and are co-located with the target object ( 140 ). According to the invention the target object is associated to at least one protecting object located between the simulated fire and the target object if such object exists in the current combat situation. This enables a consideration to various protecting object— influence on the simulated fire and the effects on corresponding actual fire. The invention thereby simulates the effects of direct fire and indirect fire in a realistic manner, which in turn provides good chances of an adequate behavior of the training personnel in a corresponding live situation.

Fuel Transfer System in the Conceptual Design Phase

Abstract: THE LARGEST AND most important fluid system in an aircraft is the fuel system. Obviously, future aircraft projects involve the design of fuel system to some degree. In this project design methodologies for aircraft fuel systems are studied, with the aim to shortening the system development time.This is done by means of illustrative examples of how optimization and the use of matrix methods have been developed and implemented at Saab Aerospace in the conceptual design of ale fuel systems. The methods introduces automation early in the development process and increase understanding of how top requirements on the ale level impact low-level engineering parameters such as pipe diameter, pump size, etc.The thesis also discusses a systematic approach when building a large simulation model of a fluid system where the objective is to minirnize the development time by applying a strategy that enables parallel development and collaborative engineering, and also by building the mode! to the correct level of detail. By correct level of detail is meant the level that yields a simulation outcome that meets the stakeholders' expectations. The experienced gained at Saab in building a simulation model, mainly from the Gripen fuel system, but also the accumulated experience from other system models, is condensed and fitted into an overall process.

Dispenser for discharging countermeasures and method therefore

Abstract: A method and an arrangement for discharging countermeasures from a carrier craft in the form of an aircraft or equivalent. The countermeasures are intended to be spread initially in the form of unit packs that, after they have left the carrier craft, are to screen the same from missiles approaching is guided by built-in sensors, or other threats. It is especially characteristic of the invention that the unit countermeasure packs are spread from the carrier transversely to the lying direction of the carrier craft.

Association method and association device for a combat exercise

Abstract: The invention concerns a method for associating an object of a second type with at least one object from a group of objects of a first type. The method is to be used in combat exercises and the above mentioned objects are players and weapons. According to the method, a signal containing the identity of the object is transmitted from each object in the group, whereupon the transmitted signals are received by the object of the second type, and the received signals are analyzed. The object of the second type is then associated with at least one preferred object in the group on the basis of the signal analysis, whereupon any previous association(s) of the object of the second type with objects of the first type is/are taken into account in the associating process. The invention also includes a device for a receiver arranged so as to realize the foregoing method.

Device and method for rotor blades

Abstract: The invention concerns a method and a device for a rotor blade for joining the rotor blade to a hub, wherein a fastening part (12) on the rotor blade comprises a composite material and is designed so as to enclose a connecting element on the hub. The invention is characterized in that the composite material is a fiber composite comprising a first set of fibers (14) that extends along the fastening part (12) in a direction that lies roughly within a range of +(10°-80°) relative to the longitudinal direction of the fastening part, and a second set of fibers (15) that extends along the fastening part in a direction within said interval, but with the fibers oriented at an angle relative to the longitudinal direction of the fastening part, which angle has the opposite sign vis-a-vis the first set of fibers. The fastening part thereby exhibits transverse contraction in the event of tensile loads on the blade with a component in the longitudinal direction of the fastening part, which imposes a clamping grip on the connecting element.

Display device and display method

Abstract: The invention concerns a device for displaying an image directly on the retina (6) of the eye (5). The device comprises means (1) arranged to emit laser radiation and modulating means (2) arranged in the beam path between the laser-radiation-emitting means (1) and the eye (5) so as to modulate the laser radiation. The device is characterized in that the modulating means (2) are arranged so as to modulate the phase front of the laser beam so that, when it strikes the refracting elements of the eye, it is deflected in a direction distinct from the direction obtained with unmodulated radiation. The invention also includes a method of displaying a retinal image.

Advanced flow simulation methods in aircraft design

Abstract: The compressible Navier‐Stokes equations are solved numerically for turbulent transonic aerospace applications on parallel computers. An Explicit Algebraic Reynolds Stress Model (EARSM) models the turbulence. Expressing the EARSM as an extension of an eddy‐viscosity model makes the implementation straightforward in a flow solver with existing two‐equation eddy‐viscosity models. The k−ω transport equations are used as a platform for the model. The EARSM approach significantly improves the shock position for transonic flow over wings without substantial increase in computational cost. Industrial use of advanced flow modelling requires a short turn‐around time of computations. This is enabled through the use of parallel computers. To achieve good parallel performance the computational load has to be evenly distributed between the processors of the parallel computer. A heuristic algorithm is described for distributing and splitting the blocks of a structured multiblock grid for a good static load balance. Speed‐up results are presented for turbulent flow around a wing on a number of parallel platforms.

ACE: advanced cockpit technologies evaluation

Abstract: The development of data generating sensors and computers in a modern fixed wing aircraft is not met by an increase in sensorial performance by the operator to assimilate this data. No new sensor has been developed nor has any drastic increase in data perception been implemented in the human operator since the first manned flight by the Wright brothers. Consequently we have to refine the media and the way in which we present data to the pilot. This document describes a platform for test and evaluation of head mounted technology and some new technologies that can be used for decreasing the pilot's workload. Furthermore, the document describes initial tests done on image quality and design of reflective coatings on visors.

Device for bracing a shell in an aircraft fuselage

Abstract: A device for bracing a shell surface (1) in an aircraft fuselage against deformations and consisting of a continuous profile that is arranged so as, after conformation, to be mounted against the shell surface. Notches (6) are spaced at regular distances apart from each other in at least a portion of the profile. The notches (6) extend through a base surface (3) in the profile, and through an intermediate part (4) perpendicular to the base surface (3). The notches (6) are delimited upwardly by an upper surface (5) that is not encompassed by said notches (6).