Sökning: "Inertia of matrices"

Visar resultat 1 - 5 av 8 avhandlingar innehållade orden Inertia of matrices.

1. 1. Statistical Properties of Preliminary Test Estimators

   Författare :Nicklas Korsell; Rolf Larsson; Johan Lyhagen; Tore Schweder; Uppsala universitet; []
   Nyckelord :Statistics; Linear regression; Preliminary test; Model selection; Test for homoscedasticity; Variance components; Truncated estimators; Inertia of matrices; Statistik;

   Sammanfattning : This thesis investigates the statistical properties of preliminary test estimators of linear models with normally distributed errors. Specifically, we derive exact expressions for the mean, variance and quadratic risk (i.e. the Mean Square Error) of estimators whose form are determined by the outcome of a statistical test. LÄS MER

3. 2. Planned Change and Inertia : Integrating Technology, Organization and Human Aspects

   Författare :Eva Lovén; Horst Hart; Linköpings universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Sammanfattning : New work organization and new computer-based tools can save costs and improve quality. A fact that often is not acknowledged is that new work organization and new computer-based tools take resources from the organization.Three empirical studies were performed in production, concerning changed work organization and managerial innovation. LÄS MER

4. 3. Modelling and analysis of multiphysical interactions in hydropower rotor systems

   Författare :Martin Karlsson; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Datorstödd maskinkonstruktion; Computer Aided Design;

   Sammanfattning : In this thesis the objective is to develop rotordynamical models of hydropower units, where coupling between mechanical, electromagnetic and fluid dynamical system systems is of certain interest. Both fluid-rotor and electromechanical interactions are known to change the system coefficients of the rotor system, which affects eigenfrequencies, damping, stability and response. LÄS MER

5. 4. Nonlinear dynamics of flexible structures using corotational beam elements

   Författare :Thanh-Nam Le; Jean-Marc Battini; Reijo Kouhia; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; corotational method; nonlinear dynamics; large displacements; finite rotations; time stepping method; thin-walled cross-section; beam element;

   Sammanfattning : The purpose of this thesis is to develop corotational beam elements for the nonlinear dynamic analyse of flexible beam structures. Whereas corotational beam elements in statics are well documented, the derivation of a corotational dynamic formulation is still an issue. LÄS MER

7. 5. Corotational formulation for nonlinear analysis of flexible beam structures

   Författare :Thanh Nam Le; Jean-Marc Battini; Jari Mäkinen; KTH; []
   Nyckelord :Corotational method; nonlinear dynamic analysis; beam element; large displacements; finite rotations; time stepping method; cubic interpolations;

   Sammanfattning : Flexible beam structures are popular in civil and mechanical engineering. Many of these structures undergo large displacements and finite rotations, but with small deformations. Their dynamic behaviors are usually investigated using finite beam elements. A well known method to derive such beam elements is the corotational approach. LÄS MER