scholarly journals Dynamic Modeling and Analysis of 5-PSS/UPU Parallel Mechanism with Elastically Active Branched Chains

2020 ◽  
Vol 33 (1) ◽  
Author(s):  
Yanbiao Li ◽  
Hang Zheng ◽  
Bo Chen ◽  
Peng Sun ◽  
Zesheng Wang ◽  
...  
Keyword(s):  
Dynamic Modeling ◽  
Parallel Mechanism ◽  
Modeling And Analysis ◽  
Branched Chains

Modular dynamic modeling and analysis of planar closed-loop mechanisms with clearance joints and flexible links

2016 ◽  
Vol 231 (3) ◽  
pp. 522-540 ◽  
Author(s):  
Zhendong Song ◽  
Xiaojun Yang ◽  
Bing Li ◽  
Wenfu Xu ◽  
Hong Hu
Keyword(s):  
Dynamic Analysis ◽  
Dynamic Modeling ◽  
Evaluation System ◽  
Parallel Mechanism ◽  
Closed Loop ◽  
Dynamic Effect ◽  
Contact Forces ◽  
Modeling And Analysis ◽  
Flexible Links ◽  
Clearance Joints

Dynamic analysis of a mechanism with clearance joints and flexible links is a research focus in the field of multibody dynamics. In this study, a general modular dynamic modeling approach based on Lagrange multiplier method for planar closed-loop mechanisms is proposed in order to improve the modeling efficiency and reusability of a structure having same topology. With this approach, dynamic analysis considering clearance joints and flexible links can be performed conveniently. A novel mathematical model to determine the relative motion modes between the two components of a clearance joint is developed based on the previous contact detection method. A complete dynamic effect evaluation system, which measures the influence of clearance joints and flexible links on the dynamic performances more conveniently and intuitively, is established. A planar 3-RRR parallel mechanism that is a closed-loop system including imperfect joints and flexible links is studied as an example. The dynamic model of this mechanism is established and its dynamic characteristics are investigated. The couple effects of clearance joints and flexible links for a parallel mechanism are investigated first. The contact forces existing in the clearance joints can cause system vibration and thus reduces the dynamic stability of the whole mechanical system. Meanwhile, the simulation results indicate that the flexible links can damp the vibration of the moving platform caused by clearance joints is certain.

Dynamic Modeling and Analysis of an Axially Moving and Spinning Rayleigh Beam Based on a Time-varying Element

2021 ◽  
Author(s):  
Shuai Yang ◽  
ajun Hu ◽  
Guidong Mo ◽  
Xingwang Zhang ◽  
Junjie Qin ◽  
...  
Keyword(s):  
Dynamic Modeling ◽  
Time Varying ◽  
Modeling And Analysis ◽  
Rayleigh Beam ◽  
Axially Moving

Dynamics of 3D Micropolar Gyroelastic Beams

2014 ◽  
Author(s):  
Soroosh Hassanpour ◽  
G. R. Heppler
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Dynamic Modeling ◽  
Dynamic Equations ◽  
Hamilton’S Principle ◽  
The Finite Element Method ◽  
Hamilton's Principle ◽  
Modeling And Analysis ◽  
Element Method

This paper is devoted to the dynamic modeling of micropolar gyroelastic beams and explores some of the modeling and analysis issues related to them. The simplified micropolar beam torsion and bending theories are used to derive the governing dynamic equations of micropolar gyroelastic beams from Hamilton’s principle. Then these equations are solved numerically by utilizing the finite element method and are used to study the spectral and modal behaviour of micropolar gyroelastic beams.

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