DETC2003/VIB-48335 A METHOD TO INVESTIGATE VIBRATIONS IN TENDON DRIVEN MECHANISMS (2008)
F. Londi, P. P. Valentini, L. Vita
In this paper the authors develop a mechanical model to analyze the vibrational behavior of tendon driven mechanisms. The description of kinematics makes use of the correspondence between graphs and...
WITH MANUFACTURING TOLERANCES- Part I (2008)
E. Pennestrì, L. Vita, P. P. Valentini
Abstract: A Cardan joint with manufacturing errors is usually modeled as an RCCC linkage. This first part, after a brief review of dual numbers, summarizes the main equation for the kinematic and...
WITH MANUFACTURING TOLERANCES- Part II (2008)
E. Pennestrì, L. Vita, P. P. Valentini
Abstract: This second part of the paper summarizes the methodology for dynamic and mechanical efficiency analysis of a Cardan joint. The numerical results have been also experimentally validated.
DETC2005-84858 MODELLING OF HYDRODYNAMIC JOURNAL BEARING IN SPATIAL MULTIBODY SYSTEMS (2008)
R. Stefanelli, P. P. Valentini, L. Vita
The model of a three dimensional journal bearing with hydrodynamic lubrication is herein presented. This model is suitable for embodiment into the equations of spatial multibody systems. Both...
M. Cavacece, E. Pennestrì, P. P. Valentini, L. Vita
This investigation concerns with the mechanical efficiency of Cardan joints. The model includes also the effects due to manufacturing and mounting errors and the influence of rotation speed on the...
Comfort analysis of car occupants: comparison between multibody and finite element models (2008)
E. Pennestrì, P. P. Valentini, L. Vita
Abstract: This paper deals with numerical models developed in order to simulate the vibrational and postural comfort of car occupants. The proposed models have been based on different mathematical...
Multibody Dynamics Simulation of Planar Linkages with Dahl Friction (2008)
E. Pennestrì, P. P. Valentini, L. Vita
It is well known that classical Coulomb dry friction model does not portrays important physical phenomena occurring in the contact between mating surfaces. Moreover, the discontinuity of force at...
Estimating The Risk From Oe Hazards On Adak Island, Alaska (2007)
Dr William Rohrer, L. Rohrer, L. Vita
Fifty years of military occupation on Adak Island in the Aleutian Chain resulted in ordnance and explosives (OE) throughout NAF Adak property. Documented OE remains in the Navy-retained UXO Zone...
COORDINATES REDUCTION AND NUMERICAL INTEGRATION OF MODELS OF CONSTRAINED MULTIBODY SYSTEMS (2007)
P. Neittaanmäki, T. Rossi, K. Majava, O. Pironneau (eds, R. Owen, M. Mikkola (assoc, ...
Abstract. The authors present a variation of the constraint orthogonalization method proposed by Kim and Vanderploeg [1] for constrained multibody systems. Firstly the theoretical bases of the QTZ...
F. Bergadano, A. Puliafito, S. Riccobene, G. Ruffo, L. Vita
Intelligent agents represent a powerful tool to implement distributed funtionalities into a network environment. This paper describes the current status of a research project whose target consists in...
E. Pennestrì, E. Pezzuti, P. P. Valentini, L. Vita
Italy has plenty of cultural heritages. The masterpieces are often placed in locations which are difficult to reach, moreover many artifacts, coming from man’s creativity, have very complex...
D. De Falco, E. Pennestrì, L. Vita
The formulation of the dynamic equations of motion proposed by Udwadia-Kalaba is discussed from the point of view of teaching effectiveness and numerical efficiency. Since this formulation requires...
Using a virtual dummy to simulate vibration dose value for different car occupants (2005)
E. Pennestrì, R. Stefanelli, P. P. Valentini, L. Vita
The comfort assessment for car occupants is not an easy task to achieve. It is a matter of personal perceiving, thus a solution which may seem comfortable to one could be not to another. Moreover it...
A Multibody Dynamic Model of a Cardan Joint with Experimental Validation (2005)
M. Cavacece, M. Cavacece, R. Stefanelli, R. Stefanelli, P. P. Valentini, P. P. Valentini, ...
Abstract. This investigation deals with the mechanical efficiency of Cardan joints. The model includes also the effects due to manufacturing and mounting errors and the influence of rotation speed...
Strategies for the Numerical Integration of DAE Systems in Multibody Dynamics (2004)
The number of multibody dynamics courses offered in the university is increasing. Often the instructor has the necessity to go through the steps of an algorithm by working out a simple example. This...
Asme Design Engineering, E. Pennestrì, R. Stefanelli, P. P. Valentini, L. Vita
In this paper a simulation of the cam actuator of a robotized gearbox is presented. The actuator is a barrel cam which moves a pin according to a prescribed motion law. The model of contact, between...
A Model for Performance Evaluation of Gracefully Degrading Systems (1993)
Catania, V., Puliafito, A., Vita, L.
The paper provides a systematic approach to modelling and assessing gracefully degrading systems, exploiting the formalism offered by Petri Nets. The procedure followed is based on the definition of...