Experiment on Dynamics of the Hybrid Polishing Kinematics Machine Tool with Clearance Based on the Flexible Multi-Body Systems

2007 ◽  
Vol 359-360 ◽  
pp. 533-537
Author(s):  
Miao Yu ◽  
Yuan Ming Zhang
Keyword(s):  
Machine Tool ◽  
Parallel Mechanism ◽  
Influence Factor ◽  
Free Form ◽  
Body System ◽  
Shock Effect ◽  
Kinematics Model ◽  
Body Dynamics ◽  
Multi Body ◽  
Free Form Surfaces

This paper develops a novel five DOF hybrid polishing kinematics machine tool in order to obtain more stable machining result in the elastic polishing on the free-form surfaces. Because the machine tool is a complex multi-body system that comprises many close-loop structures, jointing clearance becomes the important influence factor to its moving stability. The unified rigid multi-body and flexible multi-body dynamics equation of for the parallel mechanism of hybrid polishing kinematics machine tool is respectively built, which considers the influence of joint with clearance and applies the kinematics model of Newton second state. The result of analysis shows that the moving stability of the hybrid polishing kinematics machine tool is reduced due to the existing jointing clearance. However, the interior flexibility of the mechanism can reduce the shock effect of collision in the part of motion pair. It can improve the working stability of mechanism.

Research on the Inverse Dynamics of the Flexible Multi-Body Systems for the Hybrid Polishing Kinematics Machine Tool

2006 ◽  
Vol 532-533 ◽  
pp. 53-56 ◽  
Author(s):  
Miao Yu ◽  
Ji Zhao
Keyword(s):  
Machine Tool ◽  
Parallel Mechanism ◽  
Inverse Dynamics ◽  
Dynamic Control ◽  
Free Form ◽  
Constraint Force ◽  
Body Dynamics ◽  
Multi Body ◽  
Free Form Surfaces ◽  
Polishing Tool

The hybrid polishing kinematics machine tool (HPKMT) which is made up of “3 axes parallel + 2 axes series” is developed with the specially designed elastic polishing tool system for the polishing operation on the free-form surfaces by using the characteristic of the elastic polishing adequately by the authors. In order to control the HPKMT effectively, its characteristic of the kinematics and dynamics need be known deeply. Moreover, the problem of inverse dynamics is the theory foundation to apply dynamic control of the HPKMT. The analysis of the inverse of mechanism is the important part in the research of dynamics. On the basis of the differential equations of flexible multi-body dynamics, this paper discusses on the condition of knowing the trace, posture and velocity for the end of bodies how to solve the constraint force and constraint moment of each joint on the 3- PTT parallel mechanism and two-joint series mechanism.

Sensitivity Analysis of Geometric Errors for Five-Axis CNC Machine Tool Based on Multi-Body System Theory

2012 ◽  
Vol 271-272 ◽  
pp. 493-497
Author(s):  
Wei Qing Wang ◽  
Huan Qin Wu
Keyword(s):  
System Theory ◽  
Sensitivity Analysis ◽  
Machine Tool ◽  
Geometric Error ◽  
Machining Accuracy ◽  
Geometric Errors ◽  
Body System ◽  
Cnc Machine ◽  
Multi Body ◽  
Five Axis

Abstract: In order to determine that the effect of geometric error to the machining accuracy is an important premise for the error compensation, a sensitivity analysis method of geometric error is presented based on multi-body system theory in this paper. An accuracy model of five-axis machine tool is established based on multi-body system theory, and with 37 geometric errors obtained through experimental verification, key error sources affecting the machining accuracy are finally identified by sensitivity analysis. The analysis result shows that the presented method can identify the important geometric errors having large influence on volumetric error of machine tool and is of help to improve the accuracy of machine tool economically.

Joint Modeling and Simulation of the Spindle System of Hammer Crusher Based on Finite Element Analysis and Flexible Multi-Body Dynamics. Part1: Modeling

2012 ◽  
Vol 630 ◽  
pp. 291-296
Author(s):  
Yu Wang ◽  
En Chen ◽  
Jun Qing Gao ◽  
Yun Feng Gong
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
System Simulation ◽  
Geometric Model ◽  
Body System ◽  
Element Analysis ◽  
Spindle System ◽  
Body Dynamics ◽  
Multi Body ◽  
The Impact

In the past finite element analysis (FEA) and multi-body system simulation (MBS) were two isolated methods in the field of mechanical system simulation. Both of them had their specific fields of application. In recent years, it is urgent to combine these two methods as the flexible multi-body system grows up. This paper mainly focuses on modeling of the spindle system of hammer crusher, including geometric model, finite element model and multi-body dynamics (MBD) model. For multi-body dynamics modeling, the contact force between hammer and scrap steel was discussed, which is important to obtain the impact force. This paper also proposed how to combine FEA and MBS to analyze the dynamic performance of the spindle system by using different software products of MSC.Software.

Machine Slideway Wear to the Precision of the Whole Machine Impact

2012 ◽  
Vol 229-231 ◽  
pp. 2474-2477 ◽  
Author(s):  
Lin Yang ◽  
Jin Yuan Wang ◽  
Rui Nan Wu ◽  
Wei Wu
Keyword(s):  
Machine Tool ◽  
Machine Tools ◽  
Geometric Error ◽  
Unit Cell ◽  
Body System ◽  
Machine Precision ◽  
Rail Wear ◽  
Machined Parts ◽  
Multi Body ◽  
Adjacent Unit

This paper studies the influence of machine slideway precision on the overall accuracy of machine tools, and puts forward the root causes of the decline in accuracy of machine tool guide is rail wear, the decline of rail accuracy will impact on the adjacent unit cell, thus decline the accuracy of the machined parts; Finally takes floor-type milling & boring machine as research object, bases on geometric error models of the theory of multi-body system to describe the spindle box rail wear trends and establish relationship between the spindle box rail wear and the machine precision.

Research about Deformations Identification for Globoidal Cam Machine Based on Multi-Body System Theory

2014 ◽  
Vol 597 ◽  
pp. 454-457
Author(s):  
Li Ping Zhao ◽  
Hong Ren Chen ◽  
Yi Yong Yao ◽  
Hu Zhao ◽  
Peng Yan
Keyword(s):  
System Theory ◽  
Machine Tool ◽  
Structure Optimization ◽  
Machining Process ◽  
Body System ◽  
Key Factors ◽  
Machining Precision ◽  
Multi Body ◽  
Deformation Error ◽  
Stiffness Distribution

Deformation error caused by cutting heart and external force is one of the key factors influencing machining precision in machining process. Aiming to identify the machine deformation which has the most important influence on machining precision, an identification method for sensitive error and deformation based on multi-body system theory has been proposed, which lay the basis of stiffness distribution of a machine tool and structure optimization of parts. At the end of this paper, the effective of this method is verified by using the machine tool for globoidal cam.

Geometric Errors Sensitivity Analysis of Precision Vertical Machining Center Based on Multi-Body System Theory

2011 ◽  
Vol 108 ◽  
pp. 61-66 ◽  
Author(s):  
Qiang Cheng ◽  
Dong Sheng Xuan ◽  
Jie Sun ◽  
Zhi Feng Liu
Keyword(s):  
System Theory ◽  
Sensitivity Analysis ◽  
Machine Tool ◽  
Great Influence ◽  
Geometric Error ◽  
Machining Accuracy ◽  
Geometric Errors ◽  
Body System ◽  
Machining Center ◽  
Multi Body

Parts of geometric error coupled into space error is the main reason that affects machining accuracy of machine tools; therefore, how to determine the effect of geometric error to the machining accuracy and then assigning geometry precision of parts economically is a difficult problem in machine tool designing process. Therefore, based on multi-body system theory, a sensitivity analysis method of geometric error is put forward in this paper. Let’s take precision vertical machining center for an example. Firstly, an accuracy model of machining center is established based on multi-body system theory, and with 21 geometric errors obtained through experimental verification, key error sources affecting the machining accuracy are finally identified by sensitivity analysis. The example analysis shows that the proposed method can effectively identify the main geometric errors of parts that have great influence on volumetric error of machine tool, and thus provides important theoretical basis to improve the accuracy of machine tool economically.

Error Model of the Tangent Method CNC Aspheric Machine Tool Based on Multi-Body System Theory

2013 ◽  
Vol 401-403 ◽  
pp. 135-138
Author(s):  
Zheng Lin Yu ◽  
Hao Tian Yang ◽  
Bo Yu ◽  
Li Dong Gu
Keyword(s):  
System Theory ◽  
Machine Tool ◽  
Error Compensation ◽  
Mathematical Expression ◽  
Error Model ◽  
Body System ◽  
Tangent Method ◽  
Multi Body ◽  
Low Order

Based on the theory of multi-body system, for thetangent method CNC aspheric machine tool, the paper shows out the topologicalstructure and the array of low-order body of the system, the modeling processis stated, a specific mathematical expression for the comprehensive error modelis established, and it will be a steppingstone to the error compensation forthe machine tool.

The Multi-Body Dynamics Analysis and Experiment of Long Distance Steel Belt Transmission

2014 ◽  
Vol 971-973 ◽  
pp. 816-822
Author(s):  
Zhi Ping Chen ◽  
En Dao Xu ◽  
Zhen Jie Zhang ◽  
Shuai Mou ◽  
Shi Feng Yue ◽  
...  
Keyword(s):  
Stress And Strain ◽  
Body System ◽  
Long Distance ◽  
Sliding Motion ◽  
Body Dynamics ◽  
Coupling Dynamics ◽  
Belt Transmission ◽  
Multi Body ◽  
The Relationship ◽  
Element Theory

This paper establishes the dynamic model of the long distance steel belt friction transmission with multi-body system rigid-flexible coupling dynamics theory, employs the boundary element theory to research the setting of the boundary conditions, and then improve the reliability of the simulation and calculation. This paper simulates and analyzes the relationship between pre-load and load,as well as that between stress and strain,so that gets the better transmission accuracy. Starting with experiment, this paper researches on the tension characteristics, running deviation and transmission accuracy of the long distance steel belt. by comparing the result of the simulation, this paper obtains the fitting function of the pre-load of the long distance steel belt and proves it have high transmission accuracy under certain condition which has proper pre-load and load.The experiment shows that the home-made precision friction transmission testbed has the ability of precision transmission. Taking advantage of the friction transmission features of steel belt, it can solve the low transmission accuracy of conventional belt transmission which results from small Elastic modulus and big elasticity sliding motion, and fulfills the long distance friction transmission on the engineering, the deviation can be smaller than 0.5%.

Methods & Prospects of Research on Flexible Multi-Body Dynamics

2013 ◽  
Vol 353-356 ◽  
pp. 3284-3287
Author(s):  
Lin Xiao Yao ◽  
Lian Yang ◽  
Lin Jian Shangguan
Keyword(s):  
Numerical Calculation ◽  
Vibration Control ◽  
Research Method ◽  
Dynamical Equation ◽  
System Model ◽  
Body System ◽  
Body Dynamics ◽  
System Vibration ◽  
Three Stages ◽  
Multi Body

This paper summarized the research method of flexible multi-body system dynamics. Three stages of flexible multi-body system model are reviewed. The paper is especially summary on modeling method of flexible multi-body system, flexible multi-body dynamical equation numerical calculation and flexible multi-body system vibration control and so on. And the paper is looked forward to further study.

Simulation and Study on Ride Comfort of Articulated Dump Truck Based on Rigid-Flex Coupling

2014 ◽  
Vol 494-495 ◽  
pp. 55-58
Author(s):  
Jie Guo
Keyword(s):  
Finite Element ◽  
Ride Comfort ◽  
Dynamic Theory ◽  
Dynamics Simulation ◽  
Dump Truck ◽  
Body System ◽  
Finite Element Software ◽  
Body Dynamics ◽  
Set Up ◽  
Multi Body

For the poor ride comfort performance of the articulated dump truck, the dynamic model of ADT was built and its dynamic characteristics were also studied through finite element and multi-body system dynamic theory. According to the modal neutral file generated by finite element software with the flexible processing, the flexible coupling virtual prototyping model was set up for the multi-body dynamics simulation in ADAMS to obtain and analyze the data about the ADT ride comfort. This paper provided references for the design, redesign and optimization of the ADT.

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