By Carlo L. Bottasso

ISBN-10: 1402088280

ISBN-13: 9781402088285

This publication offers a suite of fifteen prime quality chosen papers from the 2007 variation of the ECCOMAS Thematic convention in Multibody Dynamics, which used to be held June 25-28 on the Politecnico di Milano, in Milan, Italy.

The goal of this assortment is to supply the overseas multibody dynamics group with an updated view at the state-of-the-art during this speedily turning out to be box of analysis which now performs a imperative function within the modeling, research, simulation and optimization of mechanical platforms in numerous fields and for a variety of business purposes.

The booklet should be of curiosity to engineers engaged on anyone of the numerous elements of contemporary multibody dynamics who are looking to be told by means of a few of the prime specialists within the box at the critical learn instructions, contemporary achievements and the main difficult winning applications.

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Extra resources for Multibody Dynamics: Computational Methods and Applications (Computational Methods in Applied Sciences)

Example text

5 Time (s) 1 Fig. 6. The normal force developed between the two-sphere foot-contact model. ‘BW’ stands for ‘bodyweight’ When the foot was tuned to fit the normal forces seen in each trial individually, a better result was obtained, however the geometry of the foot was different at every trial: the metatarsal contact was placed closer to the heel for the slow trials. One explanation for this behaviour lies in the role of toes: during slow walking the toes contribute very little to the normal force profile, shifting the average center of pressure of the forefoot towards the ankle.

3. A box is filled with a cascade of small spheres, which fill the inner space and slowly flow out from a lateral opening. All spheres are subject to rigid contacts with friction. This benchmark represents one of the most critical scenarios because, in general, the stability of the integration and the speed of convergence of the solver are both affected negatively by dense packing of objects. Multiple tests were performed with an increasing number of spheres, up to 50,000 colliding objects. The solver is able to handle problems with more than two millions unknowns.

A single spherical element was chosen to represent the heel pad. The stiffness and damping parameters were tuned to try to make the response of the model match the experimental data set. Due to the nonlinearity of the problem, a full-enumeration optimization routine was used to Multi-Step Forward Dynamic Gait Simulation Med. 7 cm/s (BW) 200 600 400 100 200 0 0 −100 0 2 4 6 Compression (mm) 8 10 −200 0 500 500 400 400 300 200 200 100 0 0 4 6 8 Compression (mm) 10 15 300 100 2 5 10 Compression (mm) Med.

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Multibody Dynamics: Computational Methods and Applications (Computational Methods in Applied Sciences) by Carlo L. Bottasso


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