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Keuning, M. (author), van de Sluis, E. (author), ten Dam, A.A. (author)Distributed simulation requires a novel approach to exercise management. With the introduction of (geographically) distributed simulations, exercise management consists of managing a multitude of simulators in a common scenario. This imposes new challenges with respect to managing the distributed responsibilities of the simulation. NLR's...report 2001
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Brogliato, B. (author), ten Dam, A.A. (author), Paoli, L. (author), Génot, F. (author), Abadie, M. (author)This paper focuses on the problems related to the numerical simulation of finite dimensional nonsmooth multibody mechanical systems. The rigid body dynamical case is examined here. This class of systems involves complementarity conditions and impact phenomena which make its study and numerical analysis a difficult problem that cannot be solved...report 2001
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Verwer, J. (author), Loeve, W. (author), Snijdoodt, E. (author), ten Dam, A. (author)In The Netherlands as a result of a national HPCN initiative a Foundation HPCN was established in 1995. The purpose of this Foundation is to stimulate structural and lasting cooperation of universities, technological institutes and industry in economically relevant applications of HPCN. Projects have been selected and since the beginning of 1996...report 1997
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ten Dam, A.A. (author), Willems, J.C. (author)The aim of this paper is to study, in a system theoretical framework, the contact problem for mechanical systems subject to unilateral constraints. Contrary to what is usually done in studies on this subject, we first investigate what can be deduced already firom the mathematical models of the unconstrained mechanical system and the constraint...report 1996
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ten Dam, A.A. (author), Dwarshuis, E. (author), Willems, J.C. (author)In this paper linear time-invariant dynamical systems described by a combination of differential equalities and static inequalities in state-space formulation are investigated. Of special interest is the contact problem: the effect (of the boundary) of the constraint set on the behaviour of the system. This effect is studied by dividing the...report 1995
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ten Dam, A.A. (author), Schrap, F. (author), Brouwer, W. (author)The Programme and Real-time Operations SIMulation support tool PROSIM is a generic simulation tool that can be used for design, verification, test and training of a wide range of applications, such as aircraft and groimd vehicles. PROSIM originated as part of the National Simulation Facility NSF at the Dutch National Aerospace Laboratoiy NLR, a...report 1994
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ten Dam, A.A. (author)A system of linear inhomogeneous inequalities determines a convex polyhedral set of feasible solutions. It is investigated under which conditions convex polyhedral sets can be represented also by a system that contains equalities as well as inequalities. Different representations of the same convex polyhedral set are related by elementary...report 1993
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ten Dam, A.A. (author)A system of linear homogeneous inequalities determines a convex polyhedral cone of feasible solutions. It is investigated under which conditions polyhedral cones can be represented also by a system that contains equalities as well as inequalities. Different representations of the same convex polyhedral cone are related by elementary...report 1993
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ten Dam, A.A. (author), van den Berg, J.I. (author)The mathematical modelling and numerical simulation of a condenser is discussed. This mathematical model is part of the NLR approach to model and scale two-phase heat transport systems (for space). During a previous study the condensation length required for various gravity conditions, and working fluids has been investigated by means of...report 1993
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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
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ten Dam, A.A. (author), van den Berg, J.I. (author)In this report the numerical simulation of a mathematical model of a condenser is discussed. This mathematical model of the NLR approach to model and scale two-phase heat transport systems. In this report the model of the condenser is reformulated to a model that is suitable for a numerical discussion. The results is a model that is represented...report 1992
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ten Dam, A.A. (author), Couwenberg, M.J.H. (author)During operations with a manipulator arm situations will occur where the manipulator end-effector is, or comes, in contact with its environment. In case of the HErmes Robot Arm HERA, contact with the environment may well be planned. For instance, operations like insertion and extraction of a tool from a tool rack, grappling of an Orbital...report 1991
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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
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ten Dam, A.A. (author)A mathematical theory for modelling dynamical systems with equality state-space constraints is presented. The dynamic behaviour of these systems is represented by a combination of differential and algebraic equations. It Is shown that the freedom offered by control is essential to obtain other, mathematically equivalent formulations. The notion...report 1990
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ten Dam, A.A. (author)Numerical simulation of constrained dynamical systems is known to exhibit stability problems even when the unconstrained system can be simulated in a stable manner. We show that not the constraints themselves, but the transformation of a continuous set of equations to a discrete set of equations is the true source of the stability problem....report 1990
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ten Dam, A.A. (author), Dieleman, P. (author)This report describes the results of an evaluation of numerical integration schemes to be used for the digital simulation of second order ordinary differential equations (ODE's) which are characteristic for multibody systems such as space manipulators. The study focuses on dedicated schemes for this type of systems. Main attention is paid to the...report 1990
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Groothuizen, R.J.P. (author), ten Dam, A.A. (author)The National Aerospace Laboratory NLR In the Netherlands develops simulation systems that are used by industry to evaluate product designs by means of digital simulation studies. Such systems Involve simulation models and simulation tools. The simulation models are software representations of the product that is to be evaluated. As such, the...report 1989
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Groothuizen, R.J.P. (author), ten Dam, A.A. (author), de Jong, H. (author)Requirements are formulated for an environment for development, verification and validation of digital simulation models of multibody systems. A realization of such an environment at the National Aerospace Laboratory NLR is described.report 1989
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ten Dam, A.A. (author), Collins, S.A. (author)In this report some aspects of the analytical and numerical solution of Partitioned Dynamical Systems (PDSs) are discussed. A PDS is solved using the Lagrange multiplier approach. The resulting equations are combined to obtain Differential-Algebraic Equations, describing a PDS. The additional algebraic equation leads to error accumulation when a...report 1988