caa a22 4500 445360461 CHVBK 20180317142913.0 cr unu---uuuuu 170323e20110401xx s 000 0 eng 10.1007/s11071-010-9843-y doi (NATIONALLICENCE)springer-10.1007/s11071-010-9843-y A new model for dry and lubricated cylindrical joints withclearance in spatial flexible multibody systems [Elektronische Daten] [Qiang Tian, Cheng Liu, Margarida Machado, Paulo Flores] A new approach to model and analyze flexible spatial multibody systems with clearance of cylindrical joints is presented in this work. The flexible parts are modeled by using absolute nodal coordinate formulation (ANCF)-based elements, while the rigid parts are described by employing the natural coordinate formulation (NCF), which can lead to a constant system mass matrix for the derived system equations of motion. In a simple way, acylindrical joint with clearance is composed of two main elements, that is, ajournal inside a bearing. Additionally, alubricant fluid can exist between these two mechanical elements to reduce the friction and wear and increase the system's life. For the case in which the joint is modeled as a dry contact pair, atechnique using a continuous approach for the evaluation of the contact force is applied, where the energy dissipation in the form of hysteresis damping is considered. Furthermore, the frictional forces developed in those contacts are evaluated by using a modified Coulomb's friction law. For the lubricated case, the hydrodynamic theory for dynamically loaded journal bearings is used to compute the forces generated by lubrication actions. The lubricated model is based on the Reynolds equation developed for the case of journal bearings with length-to-diameter ratios up to 1. Using this approach, the misalignment of the journal inside the bearing can be studied. Finally, two demonstrative examples of application are used to provide results that support the discussion and show the validity of the proposed methodologies. Springer Science+Business Media B.V., 2010 Clearance cylindrical joint nationallicence Absolute nodal coordinate formulation (ANCF) nationallicence Natural coordinate formulation (NCF) nationallicence Dry contact forces nationallicence Lubrication forces nationallicence Journal misalignment nationallicence Tian Qiang Department of Mechanics, School of Aerospace Engineering, Beijing Institute of Technology, 100081, Beijing, China aut Liu Cheng Department of Mechanics, School of Aerospace Engineering, Beijing Institute of Technology, 100081, Beijing, China aut Machado Margarida Department of Mechanical Engineering, University of Minho, Campus de Azurém, 4800-058, Guimarães, Portugal aut Flores Paulo Department of Mechanical Engineering, University of Minho, Campus de Azurém, 4800-058, Guimarães, Portugal aut Nonlinear Dynamics Springer Netherlands 64/1-2(2011-04-01), 25-47 0924-090X 64:1-2<25 2011 64 11071 https://doi.org/10.1007/s11071-010-9843-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11071-010-9843-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Tian Qiang Department of Mechanics, School of Aerospace Engineering, Beijing Institute of Technology, 100081, Beijing, China aut NATIONALLICENCE 700 1- Liu Cheng Department of Mechanics, School of Aerospace Engineering, Beijing Institute of Technology, 100081, Beijing, China aut NATIONALLICENCE 700 1- Machado Margarida Department of Mechanical Engineering, University of Minho, Campus de Azurém, 4800-058, Guimarães, Portugal aut NATIONALLICENCE 700 1- Flores Paulo Department of Mechanical Engineering, University of Minho, Campus de Azurém, 4800-058, Guimarães, Portugal aut NATIONALLICENCE 773 0- Nonlinear Dynamics Springer Netherlands 64/1-2(2011-04-01), 25-47 0924-090X 64:1-2<25 2011 64 11071 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer