Method for the Creation of a Six Bar Linkage to Simultaneously Carry Two Rigid Bodies Through Four Coordinated Positions

2012 ◽  
Author(s):  
Ronald A. Zimmerman
Keyword(s):  
Synthesis Method ◽  
Rigid Bodies ◽  
Type Synthesis ◽  
Linkage Mechanism ◽  
Center Point ◽  
Seat Cushion ◽  
The Creation ◽  
Linkage Synthesis

A method for the creation of a six bar linkage with two ground pivots to simultaneously carry two rigid bodies through four coordinated positions was invented and is described and illustrated herein. Type synthesis was used to identify possible linkage classes and specific types of possible six bar linkages. A linkage synthesis method which superimposes three Burmester center point curves to create a six bar linkage mechanism with two ground pivots, to carry two coupled rigid bodies simultaneously through four specified, coordinated positions was developed and is demonstrated. An extension of the method to carry two non-coupled rigid bodies through four positions is indicated. This method was invented in the process of developing a 2nd row automotive truck seat, which is used as an example to illustrate the procedure. A six bar linkage which carries an automotive truck seat back and seat cushion through four coordinated positions is shown.

Type Synthesis and Application of Gear Linkage Transplanting Mechanisms Based on Graph Theory

2019 ◽  
Vol 62 (2) ◽  
pp. 515-528
Author(s):  
Liang Sun ◽  
Yuzhu Zhou ◽  
Xuan Chen ◽  
Chuanyu Wu
Keyword(s):  
Graph Theory ◽  
Structural Characteristics ◽  
Synthesis Method ◽  
Kinematic Chain ◽  
Gear Train ◽  
Type Synthesis ◽  
Linkage Mechanism ◽  
Topological Graph ◽  
Labeled Graphs ◽  
Motion Characteristics

Abstract. Type synthesis is an important step when designing innovations in mechanisms. To overcome the limitation of traditional gear train transplanting mechanisms in realizing a specific trajectory, a swinging linkage mechanism is introduced into the design of the transplanting mechanism. To design a crop-transplanting gear linkage mechanism (GLM), an automatic synthesis method based on graph theory is proposed in this article. First, the numbers of loops, links, joints and other parameters, along with unlabeled graphs, are calculated based on the structural characteristics of the GLM. The labeled graphs that correspond to the kinematic chain (KC) are then obtained by thickening the edges of the unlabeled graphs, and physically reasonable labeled graphs are derived from identification of the structural rationality of the corresponding structures. Based on the relative motion characteristics of the input and output links of the transplanting mechanisms, criteria for screening the gear linkage mechanisms represented by the labeled graphs are formulated, and the labeled graphs that are suitable for transplanting are calculated to enrich the configurations of the transplanting mechanisms. Finally, two examples are tested to verify the effectiveness of the proposed type synthesis method. Keywords: Gear linkage, Screening, Topological graph, Transplanting mechanism, Type synthesis.

Planar Linkage Synthesis for Rigid Body Guidance Using Poles and Rotation Angles

2013 ◽  
Author(s):  
Ronald A. Zimmerman
Keyword(s):  
Rigid Body ◽  
Synthesis Method ◽  
Synthesis Methods ◽  
Center Point ◽  
Circle Center ◽  
Previous Solution ◽  
Design Software ◽  
Position Synthesis ◽  
Four Bar Linkage ◽  
Linkage Synthesis

A graphical four bar linkage synthesis method for planar rigid body guidance is presented. This method, capable of synthesis for up to five specified coupler positions, uses the poles and rotation angles, which are constraints, to define guiding links. Faster and simpler than traditional graphical synthesis methods, this method, allows the designer to see and consider most or all the possible solutions within a few seconds before making any free choices. All of the guiding links satisfying five specified coupler positions can be obtained graphically within 30 minutes without plotting any Burmester curves and without any mechanism design software. For four positions, both the circle and center point curves are simultaneously traced by corresponding circle-center point pairs using three poles having a common subscript and the corresponding rotation angles without any additional construction. This method eliminates the iterative construction required in previous methods which were based on free choices rather than constraints. The tedious plotting of Burmester curves graphically using pole quadrilaterals is also eliminated. The simplicity of the method makes four and five position synthesis practical to do graphically. A corresponding analytical solution is presented which provides a simpler formulation than the previous solution method. This new method requires two fewer equations and provides a new way to plot Burmester curves analytically.

A Simple Synthesis Method for Spherical 4R Linkages Reaching Four Positions

2011 ◽  
Vol 199-200 ◽  
pp. 1236-1239 ◽  
Author(s):  
Tong Yang ◽  
Jian You Han ◽  
Lai Rong Yin
Keyword(s):  
Matrix Method ◽  
Synthesis Method ◽  
Simple Synthesis ◽  
Simple Derivation ◽  
Derivation Method ◽  
Curve Equation ◽  
Linkage Synthesis

For spherical 4R linkage synthesis reaching four specified task positions, we introduce a simple derivation method of spherical Burmester curve equation by employing a displacement matrix method. Then we presented a method to calculate the coordinates of circle and center points, so the spherical Burmester curves can be drawn by the software developed.

scholarly journals Digital Content of Modern Media as a Sphere for the Formation of Digital Etiquette in the Context of Transmedia

2021 ◽  
Vol 16 (1) ◽  
pp. 177-184
Author(s):  
Marfitsyna Arina R. ◽  
Keyword(s):  
Mass Media ◽  
Rapid Development ◽  
Synthesis Method ◽  
Digital Content ◽  
Transmedia Storytelling ◽  
Modern Media ◽  
Key Characteristics ◽  
The Creation ◽  
Modern Mass ◽  
Transformation Processes

The topicality of the article is determined by the fact that it examines the specifics of modern digital content in the context of the transformation processes, which take place in modern media in the context of transmedia that influence the formation of digital etiquette. The rapid development of the technical and technological components of communication contributes to the constant transformation of digital etiquette and this is one of the problems of modern transmedia space, which actualizes the identification of the content features of digital content, the role of the axiological component of modern media materials, the definition of effective ways of their representation that corresponds with the needs of the modern digital audience. The aim of the research is to describe the key characteristics of digital content in modern media that promote the formation of digital etiquette. The novelty of the article is in the concept analysis of print media, television and radio broadcasting in the context of transmedia according to the approach of the general key characteristics of the current digital content that contribute to the formation of digital etiquette and have the prospect of further research. The methodological basis was the scientific works of media theorists in Russian and foreign scientific communities. During the work on the article in the field of researching the content of modern mass media and the transformation processes that take place in the media, the author used the methods of analysis and comparison, the synthesis method was applied in terms of discussing the research results, formulating conclusions. The results of the research show that today not only adaptation in the digital environment is required but also close integration with all processes of the digital development of society is necessary for the successful functioning of modern media. The typical key features for modern digital content, which are the environment for the formation of digital etiquette, were identified during the research. It includes the ability to consume content through various gadgets; creation of interactive materials that satisfy the demands of a certain audience and give the right to participate in the creation of content and to choose it; the creation of complex multi-component materials that are endowed with the features of the project and also the transmedia narrative pattern. The article represents the interest to practicing journalists, as well as to researchers in the sphere of development of digital journalism, transmedia storytelling, digital content features and digital etiquette. Keywords: journalism, digital content, mass media transformation, transmedia, storytelling, digital etiquette

Type Synthesis of 3-DOF Translational Parallel Manipulators Based on Atlas of DOF Characteristic Matrix

2006 ◽  
Author(s):  
Jingjun Yu ◽  
Jian S. Dai ◽  
Xin-Jun Liu ◽  
Shusheng Bi ◽  
Guanghua Zong
Keyword(s):  
System Theory ◽  
Lie Group ◽  
Synthesis Method ◽  
Parallel Manipulators ◽  
Complete Classification ◽  
Characteristic Matrix ◽  
Type Synthesis ◽  
Lie Group Theory ◽  
Low Degree ◽  
New Type

Low-degree-of-freedom (Low-DOF) parallel manipulators (PMs) have drawn extensive interest, particularly in type synthesis in which two main approaches were established in the reciprocal screw system theory and Lie group theory. This paper aims at proposing a new type synthesis method to complementing the above methods. For this purpose, the concept of the DOF characteristic matrix, originated from displacement subgroup and displacement submanifold, is proposed. A new but general approach based on the atlas of DOF Characteristic Matrix is addressed for both exhaustive classification and type synthesis of low-DOF PMs. Compared to the method based on Lie group, the proposed approach is prone to construct an orthogonal structure and easy to realize the complete classification and exhaustive enumeration of a class of low-DOF PM. In order to verify the effectiveness of the proposed method, type synthesis of Translational PMs (TPMs) particularly in ones with an orthogonal structure is performed, resulting in some novel orthogonal TPMs.

Synthesis of Programmable Mechanisms Using Adjustable Dyads

1997 ◽  
Vol 119 (2) ◽  
pp. 232-237 ◽  
Author(s):  
T. Chuenchom ◽  
S. Kota
Keyword(s):  
High Speed ◽  
Low Cost ◽  
Synthesis Method ◽  
Point Theory ◽  
Industrial Applications ◽  
Synthesis Methods ◽  
Linkage Mechanism ◽  
Manufacturing Automation ◽  
Multiple Tasks ◽  
High Production

Conventional hard automation such as linkage mechanisms and cam-driven mechanisms provide high speed capability at a low cost, but fail to provide the flexibility required in many industrial applications. On the other hand, for most manufacturing automation applications in high production industries, expensive multi-axis robots are employed for simple repetitive operations that require only limited flexibility. In order to provide a true middle ground between conventional mechanism-based hard automation and overly flexible anthropomorphic robots, we incorporate flexibility in conventional mechanisms, thereby creating “programmable mechanisms” or Adjustable Robotic Mechanisms (ARMs). This paper introduces the concept of ARMs and presents generalized analytical methods for designing adjustable mechanisms based on synthesis of adjustable dyads. The synthesis methods presented here, which are extensions of the well-known Burmester precision point theory, enable one to design multi-purpose mechanisms for multiple sets of precision points, thereby enabling conventional mechanisms to perform multiple tasks. The analytical synthesis method has been implemented in a computer program that generates all adjustable dyad solutions for given sets of precision points. Two or more adjustable dyads are assembled together to form a programmable linkage mechanism that performs multiple tasks. Synthesis formulations and a design example illustrating the analytical and computer-aided synthesis methods are presented.

Classification of 6-SPS Parallel Manipulators According to Their Components

2000 ◽  
Author(s):  
Xianwen Kong ◽  
Clément M. Gosselin
Keyword(s):  
Parallel Manipulator ◽  
Kinematic Chain ◽  
Parallel Manipulators ◽  
Rigid Bodies ◽  
Type Synthesis ◽  
Forward Displacement ◽  
Quadratic Equations ◽  
Straight Lines ◽  
Forward Displacement Analysis

Abstract The complexity of the forward displacement analysis (FDA) of 6-SPS parallel manipulators1 varies to a great extent with the change of their geometric parameters. This paper presents a classification of the 6-SPS parallel manipulators according to their components. At first, we give the components for the 6-SPS parallel manipulator. A component refers to a part of the 6-SPS kinematic chain in which the number of actuators is equivalent to the degree of freedom. In addition to the commonly used rigid bodies, points and (straight) lines are also taken as elements of the components. Type synthesis of the 6-SPS parallel manipulators is then performed. The influence of the types of components on the maximal numbers of configurations and the degrees of the characteristic polynomials of the 6-SPS parallel manipulators is then revealed. The number of redundant sensors needed to reduce the FDA of 6-SPS parallel manipulators to the solution of several univariate quadratic equations in sequence based on the component method is also presented.

A novel class of generalized parallel manipulators with high rotational capability

2020 ◽  
Vol 234 (23) ◽  
pp. 4599-4619
Author(s):  
Chunxu Tian ◽  
Dan Zhang ◽  
Jian Liu
Keyword(s):  
Parallel Manipulator ◽  
Degrees Of Freedom ◽  
Structural Characteristics ◽  
Synthesis Method ◽  
Parallel Manipulators ◽  
Rigid Bodies ◽  
Kinematic Chains ◽  
Moving Platforms ◽  
Moving Platform ◽  
Limb Structure

A conventional parallel manipulator is characterized by connecting one moving platform with two or more serial kinematic limbs. Since each limb is independently supporting one moving platform, the moving platform must be a rigid body with several kinematic pairs fixed on it. However, for generalized parallel manipulators with articulated moving platforms, the moving platforms are not limited to rigid bodies but including serial kinematic chains or internal kinematic joints. The introduction of articulated moving platforms allows for improving the kinematic performance of generalized parallel manipulators, especially for rotational capability. On account of the structural characteristics of the moving platforms, it also poses a significant challenge in the construction of the structures of manipulators. This research raises a new method for the type synthesis of generalized parallel manipulators with novel articulated moving platforms. The proposed method introduces a striking shortcut for the limb structure analysis of mechanisms with high rotational capability. In this paper, a class of generalized parallel manipulator with different degrees of freedom from 3 to 6 are constructed by using the constraint synthesis method, and several examples are provided to demonstrate the feasibility of the advocated method. At last, the 3T3R generalized parallel manipulator is taken as an example to analyze the inverse kinematics, and the evaluation of the workspace is conducted to verify the rotational capacity.

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