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.

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.

Application of a hybrid digital twin concept for factory layout planning

Abstract: As the modern society is in the middle of its fourth industrial revolution, many enabling technologies are now viable to use in an engineering context. Several of these technologies are mature and available off the shelf; however, in the industrial setting they are rather novel. Two of these are virtual reality (VR), which has grown immensely in the gaming sector, and 3-D imaging, which is commonly used in archeology and construction. This study presents lessons learned from combining these two technologies in an industrial context with the digital twin concept. Three industrial case studies have been performed, and several observations have been identified in all three aspects of sustainability. For example, improved solution fidelity at an early stage can be achieved by externalizing tacit knowledge, and multiple issues during planning and installation phases have been avoided by utilizing the hybrid digital twin models. This type of digital twin enables highly detailed production system access, enabling engineering abilities from anywhere, anytime. Furthermore, the model becomes a powerful communication tool, which has reduced the resistance to workplace changes, as stakeholders lacking computer-aided design (CAD) knowledge can be involved in the change process. The highly detailed models have also allowed more focus to be put on safety and regulations, as these aspects naturally are more suited to experience in immersive VR. In conclusion, the hybrid digital twin concept developed in this study is a promising tool for decision makers and stakeholders alike, bound to benefit those who use it in all three aspects of sustainability.

Parallel Implicit Time-Accurate Navier-Stokes Computations Using Coarse Grid Correction

Abstract: A parallel implicit Navier ‐Stokes solver is constructed using a block-by-block inversion of the resulting linear system of equations followed by a global coarse grid correction to account for the block coupling. This solver is used to compute two different cases of vortex shedding e ows. The efe ciency of our method is compared to the efe ciency of the method based on pseudotime stepping and multigrid acceleration. This comparison is based on direct comparison of the two methods applied to identical test cases, as well as results reported in the literature. Emphasis is put on scalability as well as mesh sensitivity. It is concluded that the solver is not sensitive to grid stretching and scales well with both problem size and number of processors, and it is shown that measured CPU times compare well with the multigrid approach.

Development and evaluation of a software requirements ontology

Abstract: This paper presents an ontology which has been developed to represent the requirements of a software component pertaining to an embedded system in the avionics industry. The ontology was built base ...

Addressing Lock-in, Interoperability, and Long-Term Maintenance Challenges Through Open Source: How Can Companies Strategically Use Open Source?

Abstract: This industry paper reports on how strategic use of open source in company contexts can provide effective support for addressing the fundamental challenges of lock-in, interoperability, and longevity of software and associated digital assets. The fundamental challenges and an overview of an ongoing collaborative research project are presented. Through a conceptual model for open source usage in company contexts we characterise how companies engage with open source and elaborate on how the fundamental challenges can be effectively addressed through open source usage in company contexts.