Computer-Aided Edge Loop Theory of Kinematic Structure of Mechanisms and Its Applications

2009 ◽  
Author(s):  
Huafeng Ding ◽  
Jing Zhao ◽  
Qinchuan Li ◽  
Zhen Huang
Keyword(s):  
Efficient Method ◽  
Kinematic Structure ◽  
Computation Complexity ◽  
Topological Graphs ◽  
Kinematic Chains ◽  
Loop Theory ◽  
Computer Aided ◽  
Structure Decomposition ◽  
Edge Based ◽  
Selection Of

Based on the edge-based array representation of loops in the topological graphs of kinematic chains, this paper first proposes three arithmetic operations of loops. Then the concept of the independent loop set as well as it determination rules is introduced, and a new structure decomposition algorithm of kinematic chains is presented. Based on the algorithm, an automatic and efficient method for rigid subchain detection and driving pair selection of kinematic chains is proposed. Finally, an index is proposed to assess computation complexity of kinematic analysis with respect to different driving pair selections.

Complete Atlas Database of 2-DOF Kinematic Chains and Creative Design of Mechanisms

2012 ◽  
Vol 134 (3) ◽  
Author(s):  
Huafeng Ding ◽  
Wenao Cao ◽  
Andrés Kecskeméthy ◽  
Zhen Huang
Keyword(s):  
Creative Process ◽  
Degrees Of Freedom ◽  
Systematic Approach ◽  
Computer Models ◽  
Creative Design ◽  
Kinematic Structure ◽  
Topological Graphs ◽  
Kinematic Chains ◽  
First Time ◽  
Intuitive Manner

The creation of novel kinematic structures of mechanisms still represents a major challenge in the quest for developing new, innovative devices. In this setting, computer models that can automatically generate and visualize all possible independent structures in an intuitive manner prove to be valuable as a support in the creative process of the designer. This paper proposes an automatic approach for establishing the complete atlas database of 2-DOF kinematic chains and a systematic approach for the creative design of mechanisms based on such an atlas. First, the transformation of the kinematic structure into a graph-based representation is addressed. Then, an approach for the generation of all nonfractionated topological graphs of 2-DOF (degrees of freedom) kinematic chains using contracted graphs as well as a method for synthesizing all the fractionated topological graphs through the combination of corresponding 1-DOF kinematic chains are addressed. Based on these methods, the complete atlas database of 2-DOF kinematic chains up to 15 links is established in this paper for the first time. Using this complete database, a systematic approach for the creative design of mechanisms can be derived, as illustrated for the example of an 11-link 2-DOF rode tractor.

Loop-Structure Decomposition of Kinematic Chains, Application to Rigid Sub-Chain Detection

2007 ◽  
Author(s):  
Huafeng Ding ◽  
Zhen Huang
Keyword(s):  
New Method ◽  
Loop Structure ◽  
Kinematic Chains ◽  
Structure Synthesis ◽  
Computer Aided ◽  
Structure Decomposition ◽  
Isomorphism Identification

Rigid sub-chain detection and isomorphism identification are two of the most difficult problems in the computer aided structure synthesis of kinematic chains. Based on the array representation of the loops of kinematic chains, this paper first introduces two operations of loops. Then a new theory of structure decomposition of kinematic chains is proposed on the basis of the concept of the independent loop set. After that a new method grounded on the theory is proposed for rigid sub-chain detection. Finally, the optimized algorithm for structure decomposition is presented and the corresponding program for rigid sub-chain detection is developed as well.

Computer-Aided Interactive Graphical Design of Multispeed Gearboxes

1984 ◽  
Vol 106 (2) ◽  
pp. 163-171
Author(s):  
S. G. Dhande ◽  
A. Gupta
Keyword(s):  
Computer Program ◽  
Mixed Type ◽  
Synthesis Process ◽  
Kinematic Structure ◽  
Number Of Teeth ◽  
Computer Aided ◽  
Graphical Design ◽  
Selection Of

In the present paper, a methodology for interactive, graphical design of multispeed gearboxes has been developed. The synthesis process covers the design of the kinematic structure of a gearbox including the selection of the speeds of all shafts and the selection of the number of teeth on various gears. In the proposed approach, it is possible to take into account several alternative kinematic structures of crossed, open, or mixed type. It is also possible to take into account discontinuities in the spectrums of speeds on intermediate shafts and also the inclusion of passive shafts. Based on the proposed methodology, a computer program has been developed and tested for the design of six- and eighteen-speed gearboxes. Results obtained have been presented.

Atlas Database of 2-DOF Kinematic Chains and Its Application to the Creative Design of Mechanisms

2011 ◽  
Author(s):  
Huafeng Ding ◽  
Andre´s Kecskeme´thy ◽  
Zhen Huang
Keyword(s):  
Graph Representation ◽  
Creative Design ◽  
The Novel ◽  
Kinematic Structure ◽  
Performance Indices ◽  
Topological Graphs ◽  
Systematic Method ◽  
Kinematic Chains ◽  
Challenging Issue ◽  
The Creation

Creation of novel kinematic structures of mechanisms has been a challenging issue which is usually conducted on experience and intuition. This paper, however, proposes a systematic method for the creative design of mechanism-based products and equipments on the basis of corresponding atlas database, and the creative design of an 11-link 2-DOF rode tractor is provided as an example. First, the transformation of the kinematic structure of mechanisms into graph representation is addressed. Then, the complete atlas database of 11-link 2-DOF kinematic chains is established by obtaining all the non-fractionated topological graphs through their contracted graphs and all the fractionated topological graphs through the combination of 1-DOF kinematic chains. Finally, based on the established atlas database, the creation design for the novel mechanisms of 11-link 2-DOF rode tractors is implemented, and all the nine novel feasible mechanisms (including the widely used one reported in literature) which satisfy the proposed performance indices are obtained.

Computer-aided selection of a polymer matrix for polyaniline conductive blends

1998 ◽  
Vol 9 (9) ◽  
pp. 563-568 ◽  
Author(s):  
D. Alperstein ◽  
M. Narkis ◽  
M. Zilberman ◽  
A. Siegmann
Keyword(s):  
Polymer Matrix ◽  
Computer Aided ◽  
Selection Of

Selection of Component Modes for Craig-Bampton Substructure Representations

1996 ◽  
Vol 118 (2) ◽  
pp. 264-270 ◽  
Author(s):  
D. C. Kammer ◽  
M. J. Triller
Keyword(s):  
Efficient Method ◽  
Singular Values ◽  
General Purpose ◽  
Mode Shapes ◽  
Frequency Range ◽  
Reduced Representation ◽  
Absolute Measure ◽  
Fixed Interface ◽  
Interface Mode ◽  
Selection Of

Three measures of modal dynamic importance are studied for the purpose of ranking Craig-Bampton substructure fixed interface mode shapes based upon their contribution to forces at the substructure interface, modal velocity, or modal displacement. These measures can be employed to identify mode shapes which are dynamically important and thus should be retained in a reduced analytical representation, or identified during a modal survey of the substructure. The first method considered. Effective Interface Mass, has been studied previously. However, new results are presented showing the relation between Effective Interface Mass and a commonly used control dynamics measure of modal importance called approximate balanced singular values. In contrast to the general case of approximate balanced singular values, Effective Interface Mass always gives an absolute measure of the dynamic importance of mode shapes. The EIM method is extended to consider modal velocity and modal displacement outputs. All three measures are applied to a simple substructure called the General Purpose Spacecraft. It is shown that each of these measures provides an efficient method for ranking the dynamic importance of Craig-Bampton fixed interface modes such that a reduced representation will accurately reproduce the substructure’s response in the frequency range of interest.

Enhancing CAD For The Forensic Engineer

1984 ◽  
Vol 2 (1) ◽  
Author(s):  
Lindley Manning
Keyword(s):  
Computer Graphics ◽  
Photographic Evidence ◽  
Computer Aided ◽  
Engineering Drawings ◽  
Forensic Engineering ◽  
Selection Of

The purpose of this paper is to inform the Academy of an application of computer graphics that has been successful in the court room and which has the potential for extension to many related needs of the forensic engineer. An additional purpose is to examine the possibility of cooperation within the Academy to make a broad database and selection of equipment available to the members. Attentive engineers of today are well aware of the growing use and impact of computer-aided drafting, design and analysis in a wide variety of industries. In our field, we are aware of large analysis programs which have been used with success in court, for example the CRASH series. The authors forensic engineering partnership has developed ways to utilize the more widely available drafting systems to inexpensively fill the gap between photographic evidence and full engineering drawings. We have also found that CAD drawings appear to have more impact in court than hand done drawings. In some cases

Translation Technology

2015 ◽  
Author(s):  
Lynne Bowker ◽  
Gloria Corpas Pastor
Keyword(s):  
Professional Competence ◽  
High Quality ◽  
Translation Tools ◽  
Use Of Technology ◽  
Computer Aided ◽  
Increase Productivity ◽  
Selection Of

In today’s market, the use of technology by translators is no longer a luxury but a necessity if they are to meet rising market demands for the quick delivery of high-quality texts in many languages. This chapter describes a selection of computer-aided translation tools, resources, and applications, most commonly employed by translators to help them increase productivity while maintaining high quality in their work. This chapter also considers some of the ways in which translation technology has influenced the practice and the product of translation, as well as translators’ professional competence and their preferences with regard to tools and resources.

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