Sökning: "hierarchical elements"

Visar resultat 1 - 5 av 46 avhandlingar innehållade orden hierarchical elements.

1. 1. Hierarchical finite element modelling of Biot's equations for vibro-acoustic modelling of layered poroelastic media

   Författare :Nils-Erik Hörlin; Peter Göransson; Frank Ihlenburg; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Engineering physics; finite element; hierarchical; Biot; porous material; vibro-acoustic; Teknisk fysik; Engineering physics; Teknisk fysik;

   Sammanfattning : This thesis concerns three-dimensional finite element modelling of Biot's equations for elasto-acoustic modelling of wave propagation in layered media including porous elastic materials. The concept of hierarchical (p-version) finite elements are combined with various weak forms of Biot's equations. LÄS MER

3. 2. Hierarchical Concurrent Systems from a Model-Oriented perspective

   Författare :Daniel Einarson; Data Vetenskap; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; control; systems; numerical analysis; Computer science; Distributed Systems; Hierarchical Systems; Object-Orientation; Model-Orientation; Datalogi; numerisk analys; system; kontroll; Systems engineering; computer technology; Data- och systemvetenskap;

   Sammanfattning : Real world systems are normally considered as hierarchically organized, for example, we see those as hierarchies of systems including subsystems. Examples on this can be seen in organizations where people act in environments and carry within themselves their own internal subsystem of thinking processes. LÄS MER

4. 3. On Postbuckling Analysis of Thin-walled Structures Numerical and Statistical Approaches

   Författare :Mats Ander; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; postbuckling; hierarchical elements; imperfection sensitivity; displacement gradients; total Lagrange formulation; geometrically non-linear structures;

   Sammanfattning : Thin-walled structural elements, such as plates, shells and beams are important load carrying components in civil-, mechanical-, automotive- aeronautical- and marine engineering structures. In order to reduce the weight thin-walled structures are given an optimum design making them sensitive to unforeseen deviations in geometry, boundary conditions, material properties and applied loads. LÄS MER

5. 4. REMAP-γ: A Scalable SIMD VLSI Architecture with Hierarchical Control

   Författare :Lars Bengtsson; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; array signal processing; hierarchical control; SIMD; VLSI architectures; distributed synchronous clocking; embedded supercomputing;

   Sammanfattning : While the clock speed of general purpose (uni-)processors has risen dramatically during recent years, this is not true for SIMD (Single Instruction stream Multiple Data streams) parallel processors. The reason is to be found in the structure of this type of architecture: long-range broadcasting of data, clock and control signals. LÄS MER

7. 5. Specifying Safety-Critical Heterogeneous Systems Using Contracts Theory

   Författare :Jonas Westman; Mattias Nyberg; Mats Heimdahl; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Contracts; Heterogeneous Systems; Safety; Architecture; Requirements; Specification; Elements; Compositional; IEC 61508; ISO 26262; Kontrakt; Heterogena System; Säkerhet; Arkitektur; Kravhantering; Specifiering; Element; Kompositionell; IEC 61508; ISO 26262; Machine Design; Maskinkonstruktion;

   Sammanfattning : Requirements engineering (RE) is a well-established practice that is also emphasized in safety standards such as IEC 61508 and ISO 26262. Safety standards advocate a particularly stringent RE where requirements must be structured in an hierarchical manner in accordance with the system architecture; at each level, requirements must be allocated to heterogeneous (SW, HW, mechanical, electrical, etc. LÄS MER