Joris Meijaard

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We present canonical linearized equations of motion for the Whipple bicycle model consisting of four rigid laterally-symmetric ideally-hinged parts: two wheels, a frame and a front assembly. The wheels are also axisymmetric and make ideal knife-edge rolling point-contact with the level ground. The mass distribution and geometry are otherwise arbitrary. This(More)
A riderless bicycle can automatically steer itself so as to recover from falls. The common view is that this self-steering is caused by gyroscopic precession of the front wheel, or by the wheel contact trailing like a caster behind the steer axis. We show that neither effect is necessary for self-stability. Using linearized stability calculations as a(More)
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In this article it is shown how non-holonomic constraints can be included in the formulation of the dynamic equations of flexible multibody systems. The equations are given in state space form with the degrees of freedom, their derivatives and the kinematic coordinates as state variables, which circumvents the use of Lagrangian multipliers. With these(More)
In this paper, we investigate the relationship between strategic renewal and the performance of smaller firms (less than 100 employees). We use a panel of micro data on about 1000 Dutch firms. The dataset contains information on aspects of strategic renewal, including process innovation and knowledge management. In our regression analyses we explain the(More)
for A bicycle can be self-stable without gyroscopic or caster effects See also History of thoughts about bicycle self-stability Besides the videos on the Science Magazine website, more and better quality videos and pictures can be found at: Summary This Supplementary Online Material (SOM text Chapters 1-11), supports many of the claims in the main paper.(More)
This report is published under the SCALES-initiative (SCientific AnaLysis of Entrepreneurship and SMEs), as part of the 'SMEs and Entrepreneurship programme' financed by the Netherlands Ministry of Economic Affairs. The responsibility for the contents of this report lies with EIM bv. Quoting numbers or text in papers, essays and books is permitted only when(More)
The responsibility for the contents of this report lies with EIM. Quoting numbers or text in papers, essays and books is permitted only when the source is clearly mentioned. No part of this publication may be copied and/or published in any form or by any means, or stored in a retrieval system, without the prior written permission of EIM. EIM does not accept(More)