Static Decoupling Performance Analysis and Design of Bionic Elbow Joint

2018 ◽  
Vol 36 ◽  
pp. 34-44 ◽  
Author(s):  
Bing Yan Cui ◽  
Li Wen Chen ◽  
Yong Tao Xie ◽  
Yu Da Hu
Keyword(s):  
Elbow Joint ◽  
High Efficiency ◽  
Structural Parameters ◽  
Great Influence ◽  
Parameters Optimization ◽  
Analysis And Design ◽  
Working Space ◽  
Performance Atlas ◽  
Performance Evaluation Index ◽  
Coupling Performance

The static decoupling performance is closely related to the efficiency of the bionic elbow joint mechanism. The bionic elbow joint has good static decoupling and has high efficiency and carrying capacity. First, the movement structure and characteristics of the elbow joint are analyzed, a kind of bionic elbow joint is proposed, the position inverse solution is deduced, and force Jacobin matrix of the bionic elbow joint is obtained. Second, the static coupling performance evaluation index and the global static coupling performance index are established, the performance atlas are drawn. Thirdly, by use of the Monte Carlo method the structural parameters of the bionic elbow joint are optimized and selected based on the spatial model theory, and a novel the bionic elbow joint is designed based on parameters optimization, and the static decoupling is verified by the simulation experiment of the bionic elbow joint. The analysis results shows the static decoupling performance of the bionic elbow joint is symmetrical, and with the working space of the attitude output angle increases, the static decoupling decreases gradually. Structural parameters and have great influence on the global static decoupling performance. The structural parameters of is 90mm, is 70mm,and is 30mm, the bionic elbow joint has good static decoupling. This paper lays a foundation for further analysis and research of the bionic elbow joint.

Numerical Simulation and Experimental Research on Dewatering Hydrocyclone

2014 ◽  
Author(s):  
Feng Li ◽  
Xiaoli Zhang ◽  
Wenyi Liang ◽  
Lixia Ren
Keyword(s):  
Experimental Research ◽  
High Efficiency ◽  
Structural Parameters ◽  
Cone Angle ◽  
Great Influence ◽  
Field Analysis ◽  
Inlet Section ◽  
Pipe Length ◽  
Analysis And Design ◽  
Overflow Pipe

Offshore oilfield generally has the characteristics such as high oil content of produced liquid and limited platform space etc, so it is urgent to design a kind of dewatering processing equipment with the following advantages such as small volume, high efficiency and low energy consumption etc. And the dewatering hydrocyclone studied in this paper is such a device which is mainly applied for the dehydration of crude oil in offshore oilfield exploration and development. Hydrocyclone named as the Thew type with double cones double inlets is taken as the initial model, meanwhile the physical medium parameters close to oil pipe of Bohai Sea is selected. Applying computational fluid dynamics (CFD) method, and by means of the Reynolds Stress Model and SIMPLEC algorithm in the FLUENT analysis software, the influence of structural parameters and operating parameters on the pressure field, velocity field and oil phase distribution of dewatering hydrocyclone is analyzed systematically. Some structural parameters, including swirl chamber diameter, underflow pipe length, large cone angle, small cone angle, the diameter of the overflow pipe, overflow pipe length and inlet section size etc, are optimized. A kind of main structure of dewatering hydrocyclone is determined, which can deal with about 40% of the oil-water mixtures for dewatering processing, and the comprehensive separation efficiency is higher. The numerical simulations and the experimental research results in this paper have a great influence on the advanced study and application of dewatering hydrocyclone and provide certain theory evidence for further research on flow field analysis and design improvement.

scholarly journals Kinematic Decoupling Analysis and Design of a Biomimetic Robotic Elbow Joint

2018 ◽  
Vol 2018 ◽  
pp. 1-9
Author(s):  
Bingyan Cui ◽  
Liwen Chen ◽  
Yongtao Xie ◽  
Zhijun Wang
Keyword(s):  
Elbow Joint ◽  
Structural Model ◽  
Structural Parameters ◽  
Robotic Manipulator ◽  
Initial Position ◽  
Kinematic Equation ◽  
Analysis And Design ◽  
The Monte Carlo Method ◽  
Decoupling Analysis ◽  
Performance Evaluation Index

The research of a biomimetic robotic manipulator is based on the flexible characteristics of the human upper limb joint, and a biomimetic robotic elbow joint plays a very significant role in the kinematic control of the biomimetic robotic manipulator. Most robotic elbow joints encountered today have a common disadvantage of bad neutrality, low rotational capability, and poor biomimetics. To overcome some difficulties, this paper presents a novel biomimetic robotic elbow joint. The structural model of the elbow joint is described, and the position equation is solved. Secondly, the kinematic equation of the elbow joint is established, the kinematic decoupling performance evaluation index of the elbow joint is defined, the kinematic decoupling characteristics of the elbow joint are analyzed, and the kinematic decoupling performance map in the workspace is drawn. Thirdly, using the spatial model theory, the structural parameters of the elbow joint are optimized, the structural parameters are selected by the Monte Carlo method, and the novel biomimetic robotic elbow joint is designed. The analysis results showing the kinematic decoupling performance of the elbow joint are symmetrical and the kinematic decoupling performance decreases with the increase of the angle, and there is a good kinematic decoupling in the workspace of about 35% in the vicinity of the initial position. When the structural parameters of the elbow joint are Re1=90 mm, Re2=70 mm, and Re3=30 mm, the elbow joint has a very good kinematic decoupling. This paper can lay a foundation for further analysis and research of the biomimetic robotic elbow joint.

Kinematics Analysis and Design of a Novel Robot Shoulder Joint

2013 ◽  
Vol 646 ◽  
pp. 139-143
Author(s):  
Bing Yan Cui ◽  
Zhen Lin Jin
Keyword(s):  
Performance Evaluation ◽  
Performance Index ◽  
Shoulder Joint ◽  
Evaluation Index ◽  
Analysis And Design ◽  
Work Spaces ◽  
Global Performance ◽  
Performance Atlas ◽  
Spherical Parallel Mechanism ◽  
Performance Evaluation Index

Kinematics research of mechanism is very important, the dynamic analysis and the design are based on kinematical analysis. In this paper, a novel robot shoulder joint based on 3-RRR orthogonal spherical parallel mechanism is proposed, and the kinematics transmission equation of shoulder joint is derived by using the kinematics inverse solution, and Jacobin matrix is established. Then Jacobin matrix is introduced into the global performance index, and the velocity of global performance evaluation index is defined. Furthermore, the shoulder joint dimensions are changed, and the global performance index is analyzed, then a performance atlas is given at the work spaces of shoulder joint with different dimension. It is found that the Jacobin matrix has more important influence on the kinematics performance of the shoulder joint. Having a good kinematics performance, structure dimensions ranges of shoulder joint are gained, thus the evaluation of kinematics of shoulder joint is more comprehensive. Finally, a novel robot shoulder joint is designed with the kinematics performance evaluation index.

Analysis of Static and Optimization of Structural Parameters for a Novel Leg Mechanism

2013 ◽  
Vol 646 ◽  
pp. 144-149 ◽  
Author(s):  
Bing Yan Cui ◽  
Zhen Lin Jin
Keyword(s):  
Performance Evaluation ◽  
Structural Parameters ◽  
Evaluation Index ◽  
Space Model ◽  
Work Spaces ◽  
Calculation Process ◽  
Structural Dimensions ◽  
Performance Atlas ◽  
Static Performance ◽  
Performance Evaluation Index

In order to increase wosrkspace and carrying capacity of leg mechanism and improve popularity and adaptability of leg mechanism, a novel mechanism is proposed which has three branches of 6-DOF, which used 3-UPS parallel mechanism as the prototype of the mechanism. The static performance of the leg mechanism is analyzed and the structure parameters are designed. First, the static transmission equation of the leg mechanism is established by using the principle of virtual works which simplifies the calculation process of the leg mechanism. Further, the static performance evaluation index and the global torque performance evaluation index are defined, and the performance atlas of the static performance evaluation index is plotted at the work spaces of the leg mechanism. Moreover, by using of the space model theory, the structural dimensions parameters are optimized of the leg mechanism. Finally, using a set of optimal structural dimensions parameters and the virtual prototype of leg mechanism is designed. The research provides a theoretical basis for further investigation on leg mechanism.

Application of Fuzzy Comprehensive Evaluation in Stope Structural Parameters Optimization

2012 ◽  
Vol 256-259 ◽  
pp. 271-275
Author(s):  
Qi Feng Guo ◽  
Fen Hua Ren ◽  
Sheng Jun Miao ◽  
Xin Chen
Keyword(s):  
High Efficiency ◽  
Comprehensive Evaluation ◽  
Structural Parameters ◽  
Fuzzy Optimization ◽  
Production Capacity ◽  
Fuzzy Comprehensive Evaluation ◽  
Parameters Optimization ◽  
Structural Parameter ◽  
Deep Mining ◽  
Evaluation Indexes

Alternate Room-Pillar Mining Method with Ascending Backfill is now used in deep mining of Sanshandao Gold Mine. In mining practice of the metal mines, the widths of the room and pillar vary from 6m to 15m. In order to improve the production capacity and solve the deep mining safety problems, a fuzzy optimization model containing 11 evaluation indexes was built to choose the optimal structural parameters among 8m×8m, 8m×10m, 10m×10m, 10m×12m and 12m×12m. The fuzzy comprehensive evaluation results prove that the optimal stope structural parameter is 10m×10m for safety and high efficiency mine operation.

Advances in coupled axial turbine and nonaxisymmetric exhaust volute aerodynamics for turbomachinery

2020 ◽  
pp. 095441002096645
Author(s):  
Jie Gao ◽  
Chunde Tao ◽  
Dongchen Huo ◽  
Guojie Wang
Keyword(s):  
Performance Improvement ◽  
High Efficiency ◽  
Three Dimensional ◽  
Great Influence ◽  
Aerodynamic Characteristics ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Axial Turbine ◽  
Flow Interactions ◽  
And Performance

Marine, industrial, turboprop and turboshaft gas turbine engines use nonaxisymmetric exhaust volutes for flow diffusion and pressure recovery. These processes result in a three-dimensional complex turbulent flow in the exhaust volute. The flows in the axial turbine and nonaxisymmetric exhaust volute are closely coupled and inherently unsteady, and they have a great influence on the turbine and exhaust aerodynamic characteristics. Therefore, it is very necessary to carry out research on coupled axial turbine and nonaxisymmetric exhaust volute aerodynamics, so as to provide reference for the high-efficiency turbine-volute designs. This paper summarizes and analyzes the recent advances in the field of coupled axial turbine and nonaxisymmetric exhaust volute aerodynamics for turbomachinery. This review covers the following topics that are important for turbine and volute coupled designs: (1) flow and loss characteristics of nonaxisymmetric exhaust volutes, (2) flow interactions between axial turbine and nonaxisymmetric exhaust volute, (3) improvement of turbine and volute performance within spatial limitations and (4) research methods of coupled turbine and exhaust volute aerodynamics. The emphasis is placed on the turbine-volute interactions and performance improvement. We also present our own insights regarding the current research trends and the prospects for future developments.

Parameters optimization of a high efficiency discrete Raman fiber amplifier

2007 ◽  
Author(s):  
Liang Dou ◽  
Shien-Kuei Liaw ◽  
Ming Li ◽  
Yi-Tseng Lin ◽  
Anshi Xu
Keyword(s):  
High Efficiency ◽  
Fiber Amplifier ◽  
Parameters Optimization ◽  
Raman Fiber Amplifier

The Analysis and Design of Electric Cooker

2014 ◽  
Vol 1052 ◽  
pp. 543-546
Author(s):  
Hong Yan Jin ◽  
Zhi Wei Zhu
Keyword(s):  
High Efficiency ◽  
Analysis And Design ◽  
New Material ◽  
User Friendly

Electric rice cooker is now almost each family essential kitchen supplies, so using the combination of the traditional materials with modern new material in the material, which is more safe and reliable, high efficiency; in view of novel, unique, broke dull and monotonous traditional electric rice cooker, can meet the needs of different groups; in the structure is also improved the humanized design, two gap next to the inside of the aluminum easier extraction. This design in a safe, practical, personalized, user-friendly products experience.

Analysis and design of a microstrip patch antenna for harmonic tuning in a high-efficiency integrated microwave transmitter

2007 ◽  
Author(s):  
Paolo Baccarelli ◽  
Paolo Burghignoli ◽  
Fabrizio Frezza ◽  
Alessandro Galli ◽  
Paolo Lampariello ◽  
...  
Keyword(s):  
Patch Antenna ◽  
High Efficiency ◽  
Microstrip Patch Antenna ◽  
Analysis And Design ◽  
Microstrip Patch
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