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- de Boer, A. (author), van Woerkom, P.Th.L.M. (author) report 1994
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van Woerkom, P.T.L.M. (author)The attitude motion of interplanetary, spinning spacecraft under the influence of solar radiation and optimal thrusting, is investigated. A general model is formulated to describe the forces and torques exerted on the spacecraft due to solar radiation. The model is compared with model! available in the large body of literature on the subject. It...report 1978
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- van Woerkom, P.T.L.M. (author) report 1976
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Pronk, Z. (author), van Woerkom, P.T.L.M. (author)Computer simulation and testing of zero-gravity operations in support of development of space structures becomes more and more standard. Yet, the need for hardware simulation and test facilities representing zero-gravity conditions remains necessary, because of the strong requirements for verification and validation of system responses and model...report 1995
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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
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van Woerkom, P.T.L.M. (author)This document extends the general theory of observation and control for disturbed, target following aerospace systems surveyed in the companion document NLR TR 76041 U, to include stochastic disturbances. The theory thus extended is then applied to the high accuracy attitude control of a one—dimensionally rotating spacecraft, equipped with a...report 1978
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van Woerkom, P.T.L.M. (author)The document contains a general theory towards the observation and optimal control of disturbed, target following aerospace systems. Disturbed, target following aerospace systems eire defined as aerospace systems that are designed to track a moving target system, while they are subjected to external, time-varying disturbances. The first five...report 1976
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van Woerkom, P.T.L.M. (author)Numerical simulation of the dynamics of multi-body systems constitutes a central part in the design and analysis of modern space-based systems. The report focuses on the development of a recursive formulation of the dynamics of flexible spacecraft-robotmanipulator systems, suitable for efficient numerical simulation. The rather well-established...report 1990
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van Woerkom, P.T.L.M. (author), Traas, C.R. (author)The ESA starmapper is an optical-electronic instrument with an array of photo-sensitive slits, to "be strapped down to spinning spacecraft. Recorded times of passage of known stars over these slits, together with mathematical models for spacecraft dynamics and starmapper instrument, provide the basis for recursive estimation of the spacecraft...report 1978
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- van Woerkom, K. (author) report 1981
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Zwartbol, T. (author), Terpstra, A.P. (author), van Woerkom, P.T.L.M. (author), van den Dam, R.F. (author)This document presents an approach to sampled data, on-board estimation and control of the attitude motion of manoeuvring spacecraft. Algorithms which are developed include: a - model following control of attitude manoeuvres b - estimation of spacecraft state (attitude, angular velocity, disturbance torque) c - optical-inertial attitude...report 1982
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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
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Misra, A.K. (author), van Woerkom, P.T.L.M. (author)Large robotic manipulators are to play a key role in assembly, maintenance, and servicing of future complex inorbit infrastructures. The first generation space manipulator is the Canadian Remote Manipulator System (RMS), in orbit since 1981. A second generation of large space manipulators is presently under development, for use on the...report 1995
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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
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van Woerkom, P.T.L.M. (author)Mathematical models of the dynamics of spacecraft are needed to carry out numerical simulations, to gain insight into the characteristics of the spacecraft dynamics, and to synthesize control algorithms suitable for online system Identification, estimation, and control. Increases in size and mechanical complexity of spacecraft result in...report 1985
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van Woerkom, P.T.L.M. (author)The report contains the development of the dynamics equations of a spacecraftmanipulator system with chain topology. The spacecraft may be flexible. The attached manipulator consists of an arbitrary number of links, connected by single degree-of-freedom rotational joints. None, any, or all of the links may be flexible. A rigid or flexible...report 1990
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van Woerkom, P.T.L.M. (author)The paper considers the dynamics of flexible space manipulators carrying out relatively fast maneuvers. In the past, computer simulations of the dynamics of flexible space manipulators executing large movements sometimes lacked in accuracy, especially during fast maneuvers. This deficiency can be attributed to the neglect of second-order terms...report 1991
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van Woerkom, P.T.L.M. (author), Steenman, G.J.J. (author)The objective of the study is the synthesis of an algorithm for the automatic control of an electromechanical actuator in the rotational joint of a multi-link, robotic manipulator. Control performance is assessed in terms of ability of the controlled joint to follow a commanded joint angle, or a commanded joint angular rate. Part One of the...report 1988
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van Woerkom, P.T.L.M. (author)The report deals with the equations of motion of spacecraft with rigid main body, flexible appendages, and rotors and jets on the main body. The hybrid coordinate modelling method is applied. The resulting equations describe the translational motion of the spacecraft, the rotational motion, and the coupling between these two types of motion. The...report 1981
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van Woerkom, P.T.L.M. (author)This report describes the development of the equations of motion of a system consisting of a spacecraft and an attached robotic manipulator. The configuration studied is representative for the European HERMES spacecraft with the HERA manipulator. The spacecraft is rigid. The manipulator consists of six links, two of which display structural...report 1989