A new theory for the topological structure analysis of kinematic chains and its applications

2007 ◽  
Vol 42 (10) ◽  
pp. 1264-1279 ◽  
Author(s):  
Huafeng Ding ◽  
Zhen Huang
Keyword(s):  
Structure Analysis ◽  
Topological Structure ◽  
Kinematic Chains

The Innovative Design of Airliner Front Landing Gear Mechanism

2012 ◽  
Vol 433-440 ◽  
pp. 1519-1522 ◽  
Author(s):  
Wan Chun Zhou ◽  
Jing Wang
Keyword(s):  
Topological Structure ◽  
Mechanical Device ◽  
Special Design ◽  
Design Constraints ◽  
Innovative Design ◽  
Kinematic Chains ◽  
Original Product ◽  
Gear Mechanism ◽  
Number Synthesis ◽  
Synthesis Of Mechanism

On the basis of the existing mechanism, we can induce the topological structure of the original mechanism. By using the number synthesis of mechanism, we can find the link assortment which can satisfy topological structure of the original mechanism. By using permutation, we can obtain the generalized kinematic chains. According to the special design constraints, after appointing each link and kinematic pair, we can gain all the suitable feasible specialized chains. Then making a converse reasoning based on the generalized principle, we will finally integrate the schematic diagram of mechanism suitable for our design purpose. Therefore, if we make a kinematic and a dynamic analysis on mechanism based on this, after structural designing, we can find a new mechanical device whose performance is up to or even superior to that of the original product.

Innovative Design Based on Prototypes of the Main Mechanism of Table Lamp

2012 ◽  
Vol 198-199 ◽  
pp. 189-192
Author(s):  
Wan Chun Zhou ◽  
Jian Jun Lu
Keyword(s):  
Topological Structure ◽  
Kinematic Chain ◽  
Main Mechanism ◽  
Schematic Diagram ◽  
Design Constraints ◽  
Innovative Design ◽  
Kinematic Chains ◽  
Structure Characteristics ◽  
Practical Design ◽  
Number Synthesis

On the basis of analyzing the topological structure of an original mechanism, it leads to the generalized kinematic chain meeting the same topological structure characteristics of the original mechanism in accordance with the generalized principle of mechanism, number synthesis of kinematic chain and compound hings. Allocation of ground links and performing links in the kinematic chain can get all feasible specialized kinematic chains while considering practical design constraints. In the final step, concrete schematic diagram of mechanism being restored from specialized kinematic chains leads to a series of new mechanism different from the original one. Designers ascertain appropriate new mechanism after selection and analysis.

A decoupled 2-DOF flexure-based micropositioning stage with large travel ranges

Robotica ◽  
2013 ◽  
Vol 32 (5) ◽  
pp. 677-694 ◽  
Author(s):  
Xiantao Sun ◽  
Weihai Chen ◽  
Rui Zhou ◽  
Wenjie Chen ◽  
Jianbin Zhang
Keyword(s):  
Topological Structure ◽  
Natural Frequencies ◽  
Mechanical Performance ◽  
Theoretical Models ◽  
Kinematics And Dynamics ◽  
Dynamics Analysis ◽  
Kinematic Chains ◽  
Element Simulation ◽  
Prismatic Joints ◽  
Coupling Error

SUMMARYIn this paper, a new flexure-based micropositioning stage (FMPS) is proposed to achieve decoupled XY translational motions and large travel ranges. The stage consists of four independent kinematic chains, each comprising two flexure-beam prismatic joints. The mechanism with such a special topological structure enables the motions of the platform strictly along XY axes and minimizes the parasitic rotation in theta axis. The kinematics and dynamics analysis of the mechanism are conducted to evaluate the performance of the mechanism in terms of travel range, parasitic motions, linearity, as well as natural frequency. According to the developed models, a parameter optimization of the mechanism is performed under the condition of the maximum travel range. The finite element simulation is carried out to examine the mechanical performance and the theoretical models. The experimental results show that the proposed FMPS possesses a workspace of 600 × 600 μm2, a relative coupling error of 0.6%, and the natural frequencies of 209.7 Hz and 212.4 Hz for the first two modes.

Coupling Degree of Mechanism and Its Application

2006 ◽  
Author(s):  
Jing Xiong ◽  
Ting-Li Yang ◽  
Xiangdong Yang ◽  
Dongchao Yang ◽  
Ken Chen
Keyword(s):  
Dynamic Analysis ◽  
Topological Structure ◽  
Parallel Mechanism ◽  
Kinematics And Dynamics ◽  
Parallel Mechanisms ◽  
Kinematic Chains ◽  
Unified Modeling

The kinematic and dynamic analysis of an spatial multi-loop mechanism especially parallel mechanism is significant but always complex. Based on the topological structure of mechanisms, this paper proposes the concept of coupling degree of mechanism systematically, and applies it to the criterion of basic kinematic chains(BKCs) and other problems. The relation between topology, kinematics and dynamics of parallel mechanisms is established, and then it is achieved to quantitatively describe the analysis complexity of a parallel mechanism and to obtain its simplest solving path, according to its topological structure. The preliminary method for unified modeling of the topology, kinematics and dynamics of parallel mechanisms is proposed, using BKC as the basic analysis unit. Some suggestions for optimization and selective preference of parallel mechanisms are also presented.

The Creative Design of Injector Clamping Mechanism

2011 ◽  
Vol 418-420 ◽  
pp. 2166-2169
Author(s):  
Wan Chun Zhou ◽  
Dong Min Liu
Keyword(s):  
Topological Structure ◽  
Kinematic Chain ◽  
Kinematics And Dynamics ◽  
Dynamics Analysis ◽  
Connecting Rod ◽  
Design Constraints ◽  
Kinematic Chains ◽  
Structure Characteristics ◽  
Comprehensive Theory ◽  
Design Requirements

Abstract. Analysis of a certain topological structure characteristics of clamping mechanism of injection machine, according to general principles, converts it into only containing Deputy General of the connecting rod and rotating chain. Bodies comprehensive theory of numbers after distribution combined with rod classes are general Atlas of kinematic chain. After identifying design constraints, on the redistribute members and turn the pair, you can get all man foot design requirements of viable specific Atlas of kinematic chains. Then every possible specific kinematic chain materialized to the schematic diagram of mechanism. Designers are on this basis through the kinematics and dynamics analysis to determine the best new clamping mechanism of injection machine.

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