scholarly journals Kinematics Analysis of a 4PRR-P Hybrid Machining Mechanism

2018 ◽  
Vol 232 ◽  
pp. 03054
Author(s):  
Wei Song ◽  
Yong Xu ◽  
Yeping Lv ◽  
Yong Liu ◽  
Zheng Liang
Keyword(s):  
Structural Design ◽  
Screw Theory ◽  
Search Algorithm ◽  
Dynamics Analysis ◽  
Kinematics Analysis ◽  
Hybrid Machining ◽  
Machining Mechanism ◽  
Scale Parameters ◽  
Kinematic Analyses ◽  
New Type

In this paper, a new type of 4PRR-P hybrid machining mechanism is presented. Based on the screw theory, the degree of freedom of the mechanism is verified. We solve the inverse position model of the the mechanism. The workspace of the mechanism is solved by the boundary search algorithm. The reasonable ranges of key scale parameters are obtained by investigating the influence of the parameters of the mechansm on its workspace. The above kinematic analyses and solving results can provide corresponding references for subsequent mechanism dynamics analysis and structural design.

Kinematics Analysis and Simulation of a New Type of Mechanical Excavator with Controllable Mechanism

2011 ◽  
Vol 201-203 ◽  
pp. 220-224 ◽  
Author(s):  
Gan Wei Cai ◽  
Zhuan Zhang ◽  
Yu Chen Pan ◽  
Du Chao Wu ◽  
Xi Yong Xu
Keyword(s):  
Simulation Study ◽  
Inverse Kinematics ◽  
Screw Theory ◽  
Degree Of Freedom ◽  
Maintenance Cost ◽  
Hydraulic Excavator ◽  
Kinematics Analysis ◽  
Constraint Equations ◽  
New Type

A new type of excavator is introduced in this paper aiming at solving the problems the hydraulic excavator and traditional mechanical excavator (also called Electric Shovel) have respectively, which are hydraulic leaks and high maintenance cost of the former one and the lack of flexibility of the latter one. The analysis of the proposed novel excavator is carried out including: Degree-of-Freedom (DOF) of the new mechanism by constraint screw theory, inverse kinematics using the method of constraint equations, velocities and acceleration. A simulation study is proposed based on the analysis above. Results show that: the new type of mechanical excavator has the ability to achieve flexible trajectory output within its workspace.

Structural Design and Stroke Kinematics Analysis of a Water Strider Robot

2018 ◽  
Author(s):  
Gang Wu ◽  
Chaowu Sheng ◽  
Yun Shen ◽  
Yong Guo ◽  
Xun Liu ◽  
...  
Keyword(s):  
Structural Design ◽  
Water Strider ◽  
Kinematics Analysis

Kinematic Analyses of 5-DOF 3-RCRR Parallel Mechanism

2005 ◽  
Author(s):  
Zhen Huang ◽  
Si J. Zhu
Keyword(s):  
Reference Point ◽  
Parallel Mechanism ◽  
Screw Theory ◽  
Mobility Analysis ◽  
End Effector ◽  
Numerical Example ◽  
Rotation Center ◽  
Kinematic Analyses ◽  
Base Platform ◽  
Virtual Pairs

This paper presents the kinematic analyses of a 5-DOF 3-RCRR parallel mechanism. The end-effector of this mechanism can rotate round rotation center and one reference point on it can translate in a plane parallels to the base platform. Since the traditional Kutzbach-Gru¨bler formula is not valid for this mechanism, the modified Kutzbach-Gru¨bler formula and screw theory are used in the mobility analysis. The Duffy’s spherical analytic theory is used in forward/reverse position analyses. In forward/reverse velocity/acceleration analyses, virtual mechanism principle is used to build a virtual parallel mechanism (3-PvRCRR), which is equivalent to the initial mechanism (3-RCRR) on kinematics if all rates of virtual pairs (Pv) are set to be zero. At the end, some kinematics curves are presented with a numerical example.

Secondary Development of Automatic Drawing Software of Spindle of Numerical Control Lathe

2011 ◽  
Vol 109 ◽  
pp. 571-574
Author(s):  
Shu Lan Zhang ◽  
Nan Qiao Zhang
Keyword(s):  
Computer Technology ◽  
Structural Design ◽  
Search Algorithm ◽  
Numerical Control ◽  
Secondary Development ◽  
Automatic Design ◽  
Continuous Curve ◽  
Related Data ◽  
Automatic Drawing ◽  
Common Components

Looking up data mainly depends on the designer. Automation of looking up related data of charts, curve resource is a key to automatic design of common components, and is neccessory to be solved for strength and structural design automation of common components. A continuous curve on the logarithmic coordinates taken automatically search algorithm and discrete forms of data management and automated check to take the basic data structure to solve all the data graphs and charts automatically check the computer taken. With computer technology, in mechanical product design, various standards curves and tables can be processed.

Design and Kinematic Analysis of a Novel Machine Tool With Four Rotational Axes and One Translational Axis

2019 ◽  
Vol 141 (11) ◽  
Author(s):  
Song Gao ◽  
Jihong Chen ◽  
Shusheng Liu ◽  
Xiukun Yuan ◽  
Pengcheng Hu ◽  
...  
Keyword(s):  
Machine Tool ◽  
Kinematic Analysis ◽  
Machine Tools ◽  
Inverse Kinematics ◽  
Kinematics Analysis ◽  
Rotary Axes ◽  
Machining Quality ◽  
New Type ◽  
Kinematic Performance ◽  
Five Axis

Abstract Due to their superior machining quality, efficiency, and availability, five-axis machine tools are important for the manufacturing of complicated parts of freeform surfaces. In this study, a new type of the five-axis machine tool was designed that is composed of four rotary axes as well as one translational axis. Given the structure of the proposed machine tool, an inverse kinematics analysis was conducted analytically, and a set of methods was then proposed to address the issues in the kinematic analysis, e.g., the singularity and multi-solution problems. Compared with traditional five-axis machine tools, which are typically composed of three linear axes and two rotary axes, the proposed machine tool exhibited better kinematic performance with machining parts with hub features, such as impellers, which was validated by simulations and real cuttings.

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