Design and Singularity Analysis for Nine-Bar Mechanism of Three Crank Hybrid Driven

2014 ◽  
Vol 496-500 ◽  
pp. 781-784
Author(s):  
Sheng Tao Song ◽  
Rui Qin Li ◽  
Yan Gao ◽  
Da Hai Li
Keyword(s):  
Mechanical Properties ◽  
Degrees Of Freedom ◽  
Singularity Analysis ◽  
Mechanism Analysis ◽  
Analysis Method ◽  
Loop Analysis ◽  
Two Degrees Of Freedom ◽  
Long Rod ◽  
Existence Conditions

With two degrees of freedom five-bar linkage as the foundation, carry on the multiple loop coupling, built three crank controllable nine bar mechanism similar to that of the crank slider pressing, which can meet the controlled flexible output, and conform to the mechanical properties of crank slider pressing mechanism. We use the loop analysis method to analyze the singularity of the mechanism. Analysis through two steps, first of all analysis on three crank existence conditions and the entire organization singularity, it is concluded that the condition of mechanism dont have singularity, and according to the singular condition carrying on research of singularity position, the long rod assembly condition is obtained.

Mobility and Singularity Analysis of a Class of 2-DOF Rotational Parallel Mechanisms Using a Visual Graphic Approach

2011 ◽  
Author(s):  
J. J. Yu ◽  
X. Dong ◽  
X. Pei ◽  
G. H. Zong ◽  
Xianwen Kong ◽  
...  
Keyword(s):  
System Theory ◽  
Degrees Of Freedom ◽  
Singularity Analysis ◽  
Parallel Mechanisms ◽  
Two Degrees Of Freedom ◽  
Simple Rules ◽  
Study Case ◽  
Formula Derivation ◽  
Visual Graphic

In this paper, a simple and straightforward visual graphic approach for mobility and singularity analysis of mechanisms is introduced. Although the proposed method is established upon the reciprocal screw system theory, it needs no formula derivation instead knowing about a few simple rules. As a study case, mobility and singularity analysis for a class of two degrees-of-freedom (DOF) rotational parallel mechanisms i.e. well-know Omni-Wrist III with four limbs, and its two derived architectures with three limbs (named T-type and δ-type) is analyzed by the proposed method. As a result, a novel PKM derived from Omni-Wrist III is presented, which has the DOF and kinematics property close to Omni Wrist III.

Flutter instability analysis of bridge decks using the step-by-step method

2014 ◽  
Vol 36 (1) ◽  
pp. 1-11
Author(s):  
Nguyen Van Khang ◽  
Tran Ngoc An
Keyword(s):  
Degrees Of Freedom ◽  
Bridge Decks ◽  
Point Of View ◽  
Analysis Method ◽  
Step Method ◽  
Instability Analysis ◽  
Two Degrees Of Freedom ◽  
Flutter Instability ◽  
Flutter Analysis

The branch switch characteristics of coupled flutter are clarified by use of Step-by-Step flutter analysis. In the case of typically coupled flutter instability, the branch switch characteristic from torsional branch to heaving branch is observed. In this paper, a revised step-by-step analysis method is proposed and a calculating program using MATLAB is built. Finally, the flutter behavior of the Cao Lanh Bridge, which is the long bridge in Vietnam, is studied from the point of view of flutter in two-degrees of freedom, namely torsional and heaving motion. 

Reconstruction Designs of the Lost Structures of the Antikythera Mechanism With Two Degrees of Freedom

2014 ◽  
Vol 6 (3) ◽  
Author(s):  
Jian-Liang Lin ◽  
Hong-Sen Yan
Keyword(s):  
Degrees Of Freedom ◽  
Planetary Motion ◽  
Mechanism Analysis ◽  
Two Degrees Of Freedom ◽  
Design Concepts ◽  
Astronomical Instruments ◽  
Solar Motion ◽  
Celestial Bodies ◽  
Astronomical Instrument ◽  
Existing Structure

The Antikythera mechanism is an ancient astronomical instrument with various functions to indicate the date of the Egyptian calendar, display the motions of celestial bodies, calculate astronomical periods, and predict eclipse events. However, the portions of the mechanism that have been excavated do not completely support its functions. In particular, the structures corresponding to the demonstration of solar and planetary motions have been lost. This paper presents a systematic reconstruction of design concepts for the lost structures with two degrees of freedom. According to the investigations of existing structure and other ancient astronomical instruments, design concepts with two degrees of freedom are generated, and three possible double-input conditions are identified. Based on a mechanism analysis, two types of reconstruction designs are developed: five-bar mechanisms with six joints and six-bar mechanisms with eight joints. Design constraints were determined in accordance with the historical literature and existing designs. Then, by applying the concepts of generalization and specialization, as well as the input conditions and manufacturing process, three, four, and seven feasible reconstruction designs are synthesized for the solar motion, inferior planetary motion, and superior planetary motion, respectively. In addition, relations for the teeth calculations are derived for detail designs.

Mobility and Singularity Analysis of a Class of Two Degrees of Freedom Rotational Parallel Mechanisms Using a Visual Graphic Approach

2012 ◽  
Vol 4 (4) ◽  
Author(s):  
Jingjun Yu ◽  
Xin Dong ◽  
Xu Pei ◽  
Xianwen Kong
Keyword(s):  
System Theory ◽  
Degrees Of Freedom ◽  
Singularity Analysis ◽  
Parallel Mechanisms ◽  
Two Degrees Of Freedom ◽  
Simple Rules ◽  
Formula Derivation ◽  
Visual Graphic ◽  
Kinematic Properties

In this paper, a visual graphic approach is presented for the mobility and singularity analysis of mechanisms with no helical pair. The presented method is established upon the reciprocal screw system theory. Using the visual graphic approach, the mobility and singularity analysis mainly requires applying a few simple rules and involves into no formula derivation. As a case study, the mobility and singularity analysis is implemented for a class of two degrees of freedom (DOF) rotational parallel mechanisms (RPMs), including the Omni-Wrist III with four limbs and its two derived architectures with three limbs called the T-type and Δ-type RPMs. The Δ-type one is found to has kinematic properties close to the Omni-Wrist III.

The scientific bases of autocontrol with vibration phase for a resonance beating-vibration system with two degrees of freedom driven by debalances

1996 ◽  
Vol 18 (2) ◽  
pp. 43-48
Author(s):  
Tran Van Tuan ◽  
Do Sanh ◽  
Luu Duc Thach
Keyword(s):  
Degrees Of Freedom ◽  
Regulation System ◽  
Vibration System ◽  
Two Degrees Of Freedom ◽  
System Operating

In the paper it is introduced a method for studying dynamics of beating-vibrators by means of digital calculation with the help of the machine in accordance with the needs by the helps of an available auto regulation system operating with high reability.

HOMOTOPY ANALYSIS METHOD TO SOLVE BOUSSINESQ EQUATIONS

2015 ◽  
Vol 10 (3) ◽  
pp. 2825-2833
Author(s):  
Achala Nargund ◽  
R Madhusudhan ◽  
S B Sathyanarayana
Keyword(s):  
Homotopy Analysis Method ◽  
Degrees Of Freedom ◽  
Initial Approximation ◽  
Boussinesq Equations ◽  
Convergent Series ◽  
Boussinesq System ◽  
Analysis Method ◽  
Analytical Technique ◽  
Homotopy Analysis ◽  
Region Of Convergence

In this paper, Homotopy analysis method is applied to the nonlinear coupleddifferential equations of classical Boussinesq system. We have applied Homotopy analysis method (HAM) for the application problems in [1, 2, 3, 4]. We have also plotted Domb-Sykes plot for the region of convergence. We have applied Pade for the HAM series to identify the singularity and reflect it in the graph. The HAM is a analytical technique which is used to solve non-linear problems to generate a convergent series. HAM gives complete freedom to choose the initial approximation of the solution, it is the auxiliary parameter h which gives us a convenient way to guarantee the convergence of homotopy series solution. It seems that moreartificial degrees of freedom implies larger possibility to gain better approximations by HAM.

scholarly journals Two Degrees of Freedom Slip Controller with Lateral Torque Distribution

2020 ◽  
Vol 53 (2) ◽  
pp. 14450-14455
Author(s):  
Wolfgang Degel ◽  
Stefan Lupberger ◽  
Dirk Odenthal ◽  
Naim Bajcinca
Keyword(s):  
Degrees Of Freedom ◽  
Torque Distribution ◽  
Two Degrees Of Freedom
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