By M.F. Hassan, S.M. Megahed
The foreign convention on Mechanical layout and creation has through the years tested itself as an outstanding discussion board for the trade of principles in those confirmed fields. the 1st of those meetings was once held in 1979. The 7th, and most modern, convention within the sequence used to be held in Cairo in the course of February 15-17, 2000. overseas engineers and scientists accumulated to interchange stories and spotlight the state of the art learn within the fields of mechanical layout and creation. additionally a heavy emphasis was once put on the problem of know-how move. Over a hundred papers have been accredited for presentation on the convention. present Advances in Mechanical layout & creation VII doesn't, even if, try and submit the full paintings offered yet as an alternative bargains a pattern that represents the standard and breadth of either the paintings and the convention. Ten invited papers and fifty four usual papers were chosen for inclusion in those court cases. They conceal various easy and utilized issues that may be labeled into six major different types: approach Dynamics, good Mechanics, fabric technology, production approaches, layout and Tribology, and commercial Engineering and its functions.
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5. , "Open Loop Flexiblity Control in Multi-body System Dynamics", Mechanism and Machine Theory, Volume 30, No. 6, pp. 861-869, August 1995. 6. , "Flexible Multi-body Dynamics: Review of Past and Recent Developments", Multi-body System Dynamics, Volume 1, pp. 189-222, March 1997. 7. , "Dynamics of Multi-body Systems", Cabridge University Press, 1998. 8. A. , "Equivalence of the Floating Frame of Reference Approach and Finite Element Formulations", Int. J. of Nonlinear Mechanics, Vol. 33, No. 3, pp.
Equivalent Lumped Masses can be computed at nodes i and j (Fig. 2 ) o f an element by dividing the total element mass (m) and inertia by two (since the element has a uniform cross section). a) Lumped mass formulation leads to a fully diagonal system mass matrix so the dynamic equations are uncoupled. Efficient computation of global nodal acceleration vector can be performed. Integration of the acceleration vector gives the system state at the next time step. Lack of dynamic coupling in lumped mass formulation generally results in bad accuracy of simulation results and requires the use of a large number of elements per member in order to achieve acceptable accuracy.
5). Perfect actuator joints join the last node of a previous link (Node 1) with the first node of the next link (Node 2). In the case of joints with elastic actuators, an extra node is added in between so as to simulate the internal dynamics of the actuator. Generally, all values of bearing stiffness, damping coefficients, internal lumped mass and bearing clearance should be determined separately for each joint prior to simulation, either experimentally or based on an acceptable model. The following cases are studied: Perfect Joint: The effect of adding a perfect joint is incorporated in the dynamic equations of the system as algebric constraint equations: xt = x2 & yt = y2 (4) Elastic Joint: The radial deflection between Nodes 1 and 2 is permitted.