Dynamics analysis of 2-DOF complex planar mechanical system with joint clearance and flexible links

2018 ◽  
Vol 93 (3) ◽  
pp. 1009-1034 ◽  
Author(s):  
Xiulong Chen ◽  
Shuai Jiang ◽  
Yu Deng ◽  
Qing Wang
Keyword(s):  
Mechanical System ◽  
Joint Clearance ◽  
Dynamics Analysis ◽  
Flexible Links

Dynamic Characteristic Research of Planar Four-Bar Mechanism with Joint Clearance

2012 ◽  
Vol 215-216 ◽  
pp. 912-916 ◽  
Author(s):  
Shao Jun Bo ◽  
Rui Bin Guo
Keyword(s):  
Mechanism Design ◽  
Mechanical System ◽  
Dynamic Characteristic ◽  
Contact Force ◽  
Dynamic Characteristics ◽  
Geometrical Model ◽  
Accurate Prediction ◽  
Dynamics Simulation ◽  
Joint Clearance ◽  
Dynamics Analysis

The joint clearance on mechanism dynamic characteristics influence can not be ignored. This paper established a geometrical model of planar four-bar mechanism, it built the model of contact force and friction and embedded into the software of ADAMS dynamics analysis mechanical system, which analysis the dynamics simulation of mechanism. We obtain a accurate prediction of dynamic characteristics of mechanism with joint clearance effect from the analysis. What's more the results provide reference and basis for later mechanism design [1,2,3].

A DOE- and Kriging-Based Model for Studying on the Dynamics of Multibody Mechanical Systems With Revolute Joint Clearance

2013 ◽  
Author(s):  
Zhenhua Zhang ◽  
Liang Xu ◽  
Paulo Flores ◽  
Hamid M. Lankarani
Keyword(s):  
Simulation Model ◽  
Mechanical System ◽  
Contact Force ◽  
Design Parameter ◽  
Joint Clearance ◽  
Design Parameters ◽  
Force Model ◽  
Revolute Joint ◽  
Clearance Joint ◽  
Contact Force Model

Over the last two decades, extensive work has been conducted on dynamic effect of joint clearances in multibody mechanical systems. In contrast, little work has been devoted to optimizing the performance of these systems. In this study, analysis of revolute joint clearance is formulated in term of a Hertzian-based contact force model. For illustration, the classical slider-crank mechanism with a revolute clearance joint at the piston pin is presented, and a simulation model is developed using the analysis/design code MSC.ADAMS. The clearance is modeled as a pin-in-a-hole surface-to-surface dry contact, with appropriate contact force model between the joint and bearing surfaces. Different simulations are performed to demonstrate the influence of the joint clearance size and the input crank speed on the dynamic behavior of the system with the clearance joint. An innovative design-of-experiment (DOE)-based method for optimizing the performance of a mechanical system with the revolute joint clearance for different ranges of design parameters is then proposed. Based on the simulation model results from sample points, which are selected by a Latin hypercube sampling (LHS) method, a polynomial function Kriging meta-model is established instead of the actual simulation model. The reason for development and use of the meta-model is to bypass computationally intensive simulations of a computer model for different design parameter values in place of a more efficient and cost-effective mathematical model. Finally, numerical results obtained from two application examples, considering the different design parameters, including the joint clearance size, crank speed, and contact stiffness, are presented for further analyzing the dynamics of the revolute clearance joint in a mechanical system. This allows for predicting the influence of design parameter changes, in order to minimize contact forces, accelerations, and power requirements due to the existence of joint clearance.

Dynamics analysis of space robot manipulator with joint clearance

2011 ◽  
Vol 68 (7-8) ◽  
pp. 1147-1155 ◽  
Author(s):  
Yang Zhao ◽  
Zheng Feng Bai
Keyword(s):  
Robot Manipulator ◽  
Space Robot ◽  
Joint Clearance ◽  
Dynamics Analysis

scholarly journals Programmed task based motion analysis of robotic systems equipped with flexible links and supports

2018 ◽  
Vol 241 ◽  
pp. 01008 ◽  
Author(s):  
Elżbieta Jarzębowska ◽  
Krzysztof Augustynek ◽  
Andrzej Urbaś
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Motion Analysis ◽  
Computational Procedure ◽  
Robotic Systems ◽  
Dynamics Analysis ◽  
Flexible Link ◽  
Flexible Links ◽  
Rigid Finite Element Method ◽  
Joint Coordinates

The automatic computational procedure to derivate dynamics equations of systems with programmed constraints modified to encompass compliant mechanical components in their structures is discussed in the paper. The dynamics analysis of the compliant manipulator model with a flexible link is presented as an example. The rigid finite element method is used in order to take into account the flexibility of the link. The formalism of joint coordinates and homogeneous transformations are used to describe the manipulator motion.

scholarly journals A Study on the Dynamic Responses and Joints Clearance Optimization of the Planar Operating Mechanism of High-Voltage Circuit Breaker

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Xiaofeng Li ◽  
Shijing Wu ◽  
Xiaoyong Li ◽  
Deng Zhao ◽  
Qiaoquan Li
Keyword(s):  
Mechanical System ◽  
High Voltage ◽  
Reaction Force ◽  
Circuit Breaker ◽  
Dynamic Responses ◽  
Operating Mechanism ◽  
Negative Effects ◽  
Flexible Links ◽  
High Voltage Circuit Breaker ◽  
The Operating Mechanism

The operating mechanism is responsible for a large part of machinery faults of high-voltage circuit breaker, which plays a crucial role in the reliability of the power grid. It consists of multiple flexible links connected by revolute joints with inevitable clearances between adjacent links. Flexible links and joints clearance have negative effects on the performance of the whole mechanical system. In this study, the dynamic simulation model of the multiple links articulated operating mechanism is built, and its validity is testified by operation experiment. Then, numerical simulation investigations are implemented to analyze the effects of flexible links and joints clearance on the dynamic responses of the operating mechanism. The results demonstrate that both flexible links and joints clearance exert associated negative effects on the mechanism performance. Furthermore, aimed at improving the dynamic characteristics of the operating mechanism, the joints clearance sizes are selected as design variables, and correlated optimization works are performed. After that, the acceleration and reaction force curves of the mechanical system become smoother, and the amplitudes of the two curves are reduced distinctly.

Dynamics analysis of dual-axis positioning mechanism of satellite antenna with joint clearance

2014 ◽  
Vol 10 (1) ◽  
pp. 59-74
Author(s):  
Zheng Feng Bai ◽  
Yang Zhao ◽  
Jun Chen
Keyword(s):  
Dynamic Characteristics ◽  
Dynamic Performance ◽  
Engineering Application ◽  
Friction Model ◽  
Joint Clearance ◽  
Force Model ◽  
Dynamics Analysis ◽  
Satellite Antenna ◽  
Content Type ◽  
Continuous Contact

Purpose – The existence of clearance in joints of positioning mechanism is inevitable and the movements of the real mechanism are deflected from the ideal mechanism due to the clearances. The purpose of this paper is to investigate the effects of clearance on the dynamic characteristics of dual-axis positioning mechanism of a satellite antenna. Design/methodology/approach – The dynamics analysis of dual-axis positioning mechanism with clearance are investigated using a computational approach based on virtual prototyping technology. The contact model in joint clearance is established by using a hybrid nonlinear continuous contact force model and the friction effect is considered by using a modified Coulomb friction model. Then the numerical simulation of dual-axis positioning mechanism with joint clearance is carried out and four case studies are implemented for different clearance sizes. Findings – Clearance leads to degradation of the dynamic performance of the system. The existence of clearance causes impact dynamic loads, and influences the motion accuracy and stability of the dual-axis positioning mechanism. Larger clearance induces higher frequency shakes and larger shake amplitudes, which will deteriorate positioning accuracy. Practical implications – Providing an effective and practical method to analyze dynamic characteristics of dual-axis positioning mechanism of satellite antenna with joint clearance and describing the dynamic characteristics of the dual-axis positioning system more realistically, which improves the engineering application. Originality/value – The paper is the basis of mechanism design, precision analysis and robust control system design of dual-axis positioning mechanism of satellite antenna.

Dynamics analysis and control of a spacecraft mechanism with joint clearance and thermal effect

2019 ◽  
pp. 163-215
Author(s):  
Bindi You ◽  
Dong Liang ◽  
Yang Zhao ◽  
Hao Tian ◽  
Huibo Zhang ◽  
...  
Keyword(s):  
Thermal Effect ◽  
Joint Clearance ◽  
Dynamics Analysis ◽  
And Control

The Transmission System Dynamic Analysis Considering the Gear Installation Error of the Planet Gears for Ravigneaux Automatic Gearbox

2012 ◽  
Vol 215-216 ◽  
pp. 1013-1016
Author(s):  
Kang Huang ◽  
Juan Zhang ◽  
Qi Chen ◽  
Guan Hua Feng
Keyword(s):  
System Dynamics ◽  
Dynamic Analysis ◽  
Mechanical System ◽  
Dynamic Simulation ◽  
3D Model ◽  
Dynamic Performance ◽  
Automatic Transmission ◽  
System Dynamic ◽  
Dynamics Analysis ◽  
Analysis Software

At present, although the Planet Gears for Ravigneaux Automatic Gearbox is widely used, most studies focus on the automatic transmission shift rule, few for automatic transmission in the process of installation error to analyze their dynamic performance. This paper is mainly based on the blank area of the current research, focusing on analysis gear installation error to the influence of dynamic performance. This paper build 3D model by Solidworks, and use mechanical system dynamics analysis software (ADAMS) for establishing the virtual prototype of the Planet Gears for Ravigneaux Automatic Gearbox and run the dynamic simulation. Gain the speed, the gearing mesh force at various levels and the meshing frequency.

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