Searched for: subject%3A%22Motion%22
(1 - 20 of 29)

Pages

List view
Grid view
document
Vink, W.J. (author), de Jonge, J.B. (author)
The present report is part of a "Manual" on aircraft loads, that is being prepared by NLR. It contains a computer program, to be used in combination with "MATLAB4 for Windows" (Student Edition) software, to study aircraft loading due to turbulence. It includes a simple aircraft response model with two rigid and three flexible symmetric degrees...
report 1997
document
Vreeburg, J.P.B. (author)
A model with two interacting bodies, for a spacecraft with liquid, has been developed. The spacecraft without liquid is the "tank" and is characterized by its inertial properties and the location and size of a spherical cavity. In the cavity is located the "slug", a sphere of uniform density with a variable radius. At the point of contact...
report 1996
document
Chu, Q.P. (author), Zwartbol, T. (author), van Woerkom, P.T.L.M. (author)
The objective of the present paper is to give an overview of spacecraft attitude determination with GPS. GPS receivers with single or multiple antennas nowadays are low-cost sensors that constitute a valuable complement to existing sensor suites. GPS has been widely used for positioning and vehicle navigation. However, using GPS as an attitude...
report 1995
document
Vreeburg, J.P.B. (author)
The representation of the acceleration field on a rigid body contains as parameters its angular rate and acceleration vectors plus the acceleration vector at a single point of the body. A linear accelerometer measures a local component of the field. From the response of different accelerometers, three quadratic forms in the angular rate of the...
report 1995
document
Couwenberg, M.J.H. (author), ten Dam, A.A. (author), Mans, M.T.G.A.R. (author)
Simulation plays an increasingly important role during several stages and several types of space related projects, ranging from engineering support simulators to training simulators. Therefore it is required to have a common basis for the definition, the development and, finally, the use of simulators. In this paper the approach for the...
report 1992
document
Hoeijmakers, H.W.M. (author)
An analysis is presented of results of a computational method to simulate the steady compressible vortical type of flow around a 65-deg sharp-edged cropped delta wing. The discussion emphasizes some more fundamental aspects of the numerical simulation such as the separation of the flow, the structure of the leading-edge vortex core and the flow...
report 1991
document
Couwenberg, H.J.H. (author), ten Dam, A.A. (author)
During operations with a manipulator arm situations will occur when the manipulator end-effector is, or comes, in contact with its environment. The dynamics equations, which describe the motion of the manipulator, can be represented by an ordinary differential equation for the free motion and an additional algebraic (in)equality for the motion...
report 1990
document
Spekreijse, S.P. (author), Venis, A.C.J. (author)
An efficient Roe-type flux-difference scheme for chemically reacting inviscid compressible flow in thermal equilibrium is presented. The numerical scheme is validated. Three well known chemical models are compared. The set of testcases concerned quasi one-dimensional hypersonic nozzle flows, with and without strong normal Shockwaves.
report 1990
document
Steenman, G.J.J. (author)
A substantial part of current research in robotics and automation is focussed on space robots and manipulators. In this research there is an increasing demand of simulation facilities. Test rigs of space robots/manipulators are usually very complex and expensive. In this report, a generic joint model is developed for the simulation facility of...
report 1988
document
van Woerkom, P.T.L.M. (author)
The objective of the study is to develop the equations of motion of a single link, flexible manipulator, attached to an orbiting spacecraft. A payload may be attached to the end-effector of the manipulator. Starting point is d'Alembert's principle, with displacements described by hybrid coordinates. The equations of motion for the two-body...
report 1988
document
Boerstoel, J.W. (author)
report 1988
document
van Woerkom, P.T.L.M. (author)
The objective of the study is to contribute towards the formulation of a mathematical truth model for the dynamics of a robotic manipulator which is attached to an orbiting spacecraft-manipulator system consisting of rigid constituent body is assumed to be known; here the generalization to the case of structurally flexible bodies is attempted....
report 1987
document
van Woerkom, P.T.L.M. (author)
If one wishes to simulate the djmamics of a structurally flexible, mechanical system with the aid of rigid body software, one may be tempted to use the "fictitious joints" modelling technique recently advocated In literature. The technique is believed to be promising in the case of flexible, slender beams, such as some of the links of a space...
report 1987
document
Elsenaar, A. (author)
As part of the joint International Vortex Flow Experiment, force and pressure measurements have been carried out on a 65 deg delta wing configuration in the transonic and supersonic wind tunnels of NLR. Out of these data three test cases were selected by the organizing committee of the GAMM WORKSHOP on the "Numerical Simulation of Compressible...
report 1986
document
Boerstoel, J.W. (author)
An analysis of various alternative approaches in grid generation is presented. A grid-generation procedure for complex aircraft configurations could be based on a combination of three subprocesses, . decomposition of the flow domain into about 100 hexahedronal blocks, . trilineair transfinite interpolation to generate initial grid point...
report 1986
document
Koppenol, P.J. (author)
A computational method for solving the 3D Euler equations is studied. The method is based upon an upwind flux-difference splitting scheme by Osher, exhibiting an implicit mechanism for numerical viscosity, in connection with an explicit time-marching finite-volume technique. The computer program is developed to run efficiently on both a scalar...
report 1985
document
Vogels, M.E.S. (author)
One of the experiments performed on board Spacelab, involves a partially filled annular cylinder which is subjected to prescribed motions (Ref. 1). The interest in this configuration arises from its practical use; for instance, the coolant in IRAS was stored in an annulus-like tank. In this report, a mathematical model for the transient liquid...
report 1984
document
Prins, J.J.M. (author)
The testing of Spacecraft Attitude and Orbit Control Subsystems is described from the early design up to in-flight, inclusive. Main topics dealt with are: description of three generic AOCS test classes, model philosophy, standardization, subsystem static test methods, subsystem dynamic test methods, generic test equipment and test facilities....
report 1984
document
van Woerkom, P.T.L.M. (author)
Software design for digital computer simulation of the dynamics of flexible spacecraft equipped with actuators and sensors, should take into account two properties of the overall system: (i) s.ampled-data control of the spacecraft leads to discontinuous inputs (forcing functions) in the differential equations of motion, thereby requiring...
report 1983
document
Best, M.R. (author)
In NLR TR 82075 U, a method has been developed to reconstruct the flight-path of a symmetric flight, by representing this path by a set of splines. In the present report, the same method is being applied to a three-dimensional flight over a rotating earth. Preliminary results are comparable in accuracy and computing time to the Kalman (Square...
report 1983
Searched for: subject%3A%22Motion%22
(1 - 20 of 29)

Pages

List view
Grid view