Uniform fatigue load model: Phase 1a - Evaluation of existing models

Towards Integrated Analysis of Gas Turbine Components for Life Prediction

An overview of the activities on integrated analysis of gas turbine components at the National Aerospace Laboratory NLR in the Netherlands is presented. Key elements are the multidisciplinary frame-work including Engine System Performance, Fluid Dynamics Analysis, Heat Flow Analysis, Stress Analysis and Life Assessment, and a complementary...

Space manipulator simulation for tele-operation

Developing algorithms for efficient simulation of flexible space manipulator operations

A brief description is given of the European Robot Arm (ERA), and its intended application to assembly, maintenance, and servicing of the Russian segment of the International Space Station Alpha. The need for manipulator simulation is recalled, and ERA simulator development is outlined. System characteristics that must be modelled for...

Space manipulator deformation models and accuracy of berthing manoeuvres

A study on methods to compare measured and calculated modal data

Fokker Space and Systems and the National Aerospace Laboratory NLR performed a study to integrate more systematically the experimental and analytical analysis of the dynamic behaviour of structures. The study focused on the correlation of experimental and analytical data, matrix and parameter updating methods. In this paper an overview will be...

Development and validation of a linear recursive "order-n" algorithm for the simulation of flexible space manipulator dynamics

Correlation, error-localisation and updating of the second problem defined in GARTEUR AG11

A description is given of the second problem, a clamped-free truss structure, defined in the GARTEUR Action Group 11. The measured and calculated modal data of the structure are correlated, the locations of the errors are determined and finally the finite element model of the structure is updated. These analyses are performed with the B2000...

Influence of reduction and interpolation methods on the correlation of calculated and measured modal data of a solar array

At Fokker Space and Systems the measured and calculated modal data of an ARA 3-panel-clean-wing were correlated. The number of degrees of freedom (dof's) of the finite element model (FEM) is about 6400 and of the measurement 32. Three methods were used to obtain corresponding dof's namely: 1) the number of dof's of the FEM was reduced with a...

Feasibility of contact modelling for the Hera simulation facility non-real-time using a compliance matrix

This technical note gives the results of the work carried out in the workpackage on Compliance Matrix Determination (WP 2202) as carried out by NLR during the HERA phase CO contract. During operations with the HErmes Robot Arm (HERA) situations will occur in which the End-Effector (EE) of the manipulator has mechanical interaction with its...

The B2000 linear buckling processor

In many practical problems of plate and shell buckling, the pre-buckling state is linear and can be obtained from the linearized equations of elasticity. The computation of the buckling load and mode in such cases correponds to a linear eigenvalue problem that can easily be formulated and implemented in a finite element code. This report...

The nonlinear analysis part of B2000: a first evaluation

In this report a description is given of the nonlinear package of B2000. The set-up of the continuation procedure which controls the nonlinear calculations is explained. At some points the existing continuation procedure was modified to enhance its performance. The nonlinear package contains a nonlinear rod element and a nonlinear thick shell...