Dynamic Characteristic Analysis and Structural Modification of a 5-Axis Horizontal Machining Center Considering Joint Surface

2011 ◽  
Vol 697-698 ◽  
pp. 513-516
Author(s):  
Y.G. Shi ◽  
Xing Yu Zhao ◽  
Li Qiang Zeng ◽  
H.Y. Wang ◽  
Da Wei Zhang
Keyword(s):  
Finite Element ◽  
Dynamic Characteristic ◽  
Dynamic Characteristics ◽  
Structural Modification ◽  
Weak Link ◽  
Joint Surface ◽  
Element Calculation ◽  
Characteristic Analysis ◽  
Machining Center ◽  
Surface Dynamic

In order to make a 5-axis linkage horizontal machining center have better dynamic characteristics, considering the influence of joint surface, dynamic characteristic analysis is conducted to the machining tool. Based on finite element modal analysis results, the weak link is found and optimized. Through the finite element calculation and analysis, the structure rigidity obviously raises after optimization. This offers a new idea on how to improve the rigidity of complete machine of machining tool for later research.

Static and Dynamic Characteristic Analysis for the HSR Series Linear Motion Guide

2013 ◽  
Vol 834-836 ◽  
pp. 1488-1492
Author(s):  
Yao Man Zhang ◽  
Ren Jun Gu ◽  
Guang Xiao Yang
Keyword(s):  
Finite Element ◽  
Machine Tool ◽  
Dynamic Characteristic ◽  
Dynamic Characteristics ◽  
Linear Motion ◽  
Characteristic Analysis ◽  
Static And Dynamic Characteristics ◽  
Nc Machine Tool ◽  
Nc Machine ◽  
Linear Motion Guide

The dynamic characteristic of junction surface is an important part of the dynamic characteristics of NC machine tools, and it is sometimes the weakest link of the machine tool's dynamic characteristics. The precision of the finite element calculation of the machine tool's dynamic characteristics shall be affected by the junction surface parameters directly. Linear Motion guide is one of the most widely used components of the NC machine tool, and its characteristic is one of the most important components of the performances of the NC machine tool. The HSR series of linear motion guides are taken as the object of the paper, and its static and dynamic characteristics are studied. And the parameters of static and dynamic characteristics of HSR, such as static stiffness, natural frequency and modal shape are obtained. The accuracy of the finite element analysis mode is verified, which establishes the foundation for the dynamics analysis of machine tool.

Static and Dynamic Characteristic Analysis of the Tower for Vertical Axis Wind Turbine Based on Finite Element Method

2012 ◽  
Vol 229-231 ◽  
pp. 613-616
Author(s):  
Yan Jue Gong ◽  
Yuan Yuan Zhang ◽  
Fu Zhao ◽  
Hui Yu Xiang ◽  
Chun Ling Meng ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Wind Turbine ◽  
Dynamic Characteristic ◽  
Optimization Design ◽  
Vertical Axis ◽  
Vertical Axis Wind Turbine ◽  
Characteristic Analysis ◽  
Support Structure ◽  
Element Method

As an important part of the vertical axis wind turbine, the support structure should have high strength and stiffness. This article adopts finite element method to model a kind of tower structure of the vertical axis wind turbine and carry out static and modal analysis. The static and dynamic characteristic results of tower in this paper provide reference for optimization design the support structure of wind turbine further.

Weak-Points Diagnosis and Optimization of Shield Machine Cutter Tool Based on Characteristic Parameters

2016 ◽  
Vol 693 ◽  
pp. 1479-1485 ◽  
Author(s):  
Jian Zhao ◽  
Xue Wu Hong ◽  
Ming Yu ◽  
Zhi Peng Gao ◽  
Wen Jin Wang
Keyword(s):  
Finite Element ◽  
Dynamic Characteristics ◽  
Optimization Design ◽  
Weak Link ◽  
Human Life ◽  
Element Model ◽  
Ring Structure ◽  
Modal Parameters ◽  
Underground Engineering ◽  
Shield Machine

Shield machine plays an indispensable role in the mining, transportation, underground engineering, hydraulic engineering and municipal construction. Shield cutters of shield construction process often appears serious deformation, damage that leads to engineering accident, or even a threat to human life and safety. In order to provide high precise data for shield machine cutter tool dynamic modification and to diagnose the shield machine cutter tool fault, the dynamic characteristic of the shield machine cutter tool system, which is the main component of a shield machine cutter tool, has to be obtained precisely. The compute modal parameters identification method base on the finite element method is proposed to identify the modal parameters of the shield machine cutter tool. By means of Solidwords software, the knife ring structure of the shield machine tool and the tool is designed; then build the tool the finite element model, modal analysis, obtained the dynamic characteristics, and find out the weak link, put forward the improvement measures and prolong its life. Therefore, the study on dynamic characteristics of shield machine cutter, for the optimization design of domestic tool, has an important significance improve tool life.

Simulation and Test Study on Dynamic Characteristic of Air Spring with Auxiliary Chamber

2013 ◽  
Vol 341-342 ◽  
pp. 391-394 ◽  
Author(s):  
Li Qing Sun ◽  
Zhong Xxing Li ◽  
Xu Feng Shen ◽  
Jia Yi Zhu
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Dynamic Characteristic ◽  
Dynamic Characteristics ◽  
Excitation Frequency ◽  
Initial Pressure ◽  
Element Model ◽  
Air Spring ◽  
Chamber Volume ◽  
Lower Excitation

In order to improve dynamic characteristics of air spring with auxiliary chamber, finite element model of air spring R1A390-295 with auxiliary chamber connected with pipe is established,and through analysis to the dynamic characteristics of the model, influence discipline of sitffness characteristics to air spring with different pipe, different auxiliary chamber or different initial pressure are analysed under different excitation. The result show that:minor dynamic sitffness is obtained by using larger pipe or under lower excitation frequency,and as volume of auxiliary chamber increases, the spring dynamic sitffness will decrease accordingly and its amplitude tends to gentle,and influence for decreasing the spring dynamic sitffness is not obvious by continuing to increase the auxiliary chamber volume; the spring dynamic sitffness will increases as initial pressure increases. The validity of Finite element model is verified through dynamic characteristic test .

The Dynamic Characteristic Analysis of Full Hydraulic Steering System in Large Mining Truck

2013 ◽  
Vol 433-435 ◽  
pp. 59-62
Author(s):  
Jiang Yong
Keyword(s):  
Dynamic Characteristic ◽  
Dynamic Characteristics ◽  
Steering System ◽  
Technical Support ◽  
Heavy Duty ◽  
Characteristic Analysis ◽  
Hydraulic Steering

The SGA170 mine truck was used as research object, the full hydraulic steering system and it's dynamic characteristics was simulated by the AMESim, the characteristics and simulation curve of the steering system and the steering mechanical under various conditions was obtained, which provided theoretical reference and technical support to the design and analysis of full hydraulic steering system of the heavy-duty mine truck, and has important value in the engineering.

Dynamic Analysis of CNC Gantry Surface Grinder by Finite Element Method

2010 ◽  
Vol 102-104 ◽  
pp. 339-343
Author(s):  
Ze Yu Weng ◽  
Shao Heng Hu ◽  
Nan Nan Zhang ◽  
Hong Gang Ding ◽  
Hong Wu You
Keyword(s):  
Finite Element ◽  
Dynamic Characteristics ◽  
Weak Link ◽  
Element Model ◽  
Structural Features ◽  
Surface Grinding ◽  
Mode Shapes ◽  
Grinding Machines ◽  
Grinding Machine ◽  
Machine Structure

The dynamic characteristics of the grinding machines have an impact on its machining quality and cutting efficiency. In this paper, through the analysis of the structural features of the Large CNC gantry surface grinding machine, the finite element model of structure of the grinder was established on the base of the simplified machine structure, on which carried out its dynamics analysis, obtaining the modal parameters of the orders under different mode shapes. The effect on the dynamic characteristics of machine tools was analyzed under different mode shapes, then the weak link of the surface grinding machine was given, and then how to improve the structural design weakness of surface grinding machine was discussed, all of which provided theoretical basis for improvemental design for the structure of the large CNC gantry surface grinding machine.

Dynamic Characteristics Analysis and Finite Element Simulation of Steel–BFPC Machine Tool Joint Surface

2019 ◽  
Vol 142 (1) ◽  
Author(s):  
Jiaxing Shen ◽  
Ping Xu ◽  
Yinghua Yu
Keyword(s):  
Neural Network ◽  
Finite Element ◽  
Machine Tool ◽  
Finite Element Simulation ◽  
Dynamic Characteristics ◽  
Dynamic Performance ◽  
Joint Surface ◽  
Element Simulation ◽  
Neural Network Prediction ◽  
Network Prediction

Abstract The dynamic performance of the steel–Basalt fiber polymer concrete (BFPC) machine tool joint surface (referred to as the joint surface) has a significant impact on the overall BFPC machine tool performance; however, its dynamic characteristics remain unclear. In order to solve this problem, the influence of roughness and surface pressure on the dynamic performance of joint surface was studied experimentally, and a neural network prediction model for the dynamic performance of the joint surface was established. A BFPC bed was designed and manufactured, and BFPC bed’s dynamic performance was tested experimentally. The finite element simulation model of BFPC bed was established with equivalent spring-damper element. The BFPC bed’s dynamic performance without considering the influence of the joint surface and considering the influence of the joint surface was studied separately. The results show that the maximum error of the natural frequency of the BFPC bed was 6.937% considering the influence of the joint surface, which was much lower than the error without considering the influence of the joint surface. The maximum amplitude error of the X-axis and Z-axis acceleration of the BFPC bed was 6.917% and 5.15%, which were much smaller than the error without considering the influence of the joint surface. It proves the accuracy of the neural network prediction model for dynamic performance of the joint surface and the validity of the finite element simulation method for the joint surface. It provides theoretical support for the design analysis of BFPC machine tool.

Structural investigation of steel-reinforced epoxy granite machine tool column by finite element analysis

2019 ◽  
Vol 233 (11) ◽  
pp. 2267-2279 ◽  
Author(s):  
Prabhu Raja Venugopal ◽  
M Kalayarasan ◽  
PR Thyla ◽  
PV Mohanram ◽  
Mahendrakumar Nataraj ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Cast Iron ◽  
Machine Tool ◽  
Dynamic Characteristics ◽  
Element Model ◽  
Static Stiffness ◽  
Element Analysis ◽  
Static And Dynamic Characteristics ◽  
Machining Center

Higher damping with higher static stiffness is essential for improving the static and dynamic characteristics of machine tool structures. The structural vibration in conventional machine tools, which are generally made up of cast iron and cast steel, may lead to poor surface finish and the dimensional inaccuracy in the machined products. It leads to the investigation of alternative machine tool structural materials such as concrete, polymer concrete, and epoxy granite. Although epoxy granite has a better damping capacity, its structural stiffness (Young's modulus) is one-third as compared to cast iron. Therefore, the present work represents optimization of the structural design of the vertical machining center column by introducing various designs of steel reinforcement in the epoxy granite structure to improve its static and dynamic characteristics using experimental and numerical approaches. A finite element model of the existing cast iron vertical machining center column has been developed and validated against the experimental data obtained using modal analysis. Furthermore, finite element models for various epoxy granite column designs have been developed and compared with the static and dynamic characteristics of cast iron column. A total of nine design configurations for epoxy granite column with steel reinforcement are evolved and numerical investigations are carried out by finite element analysis. The proposed final configuration with standard steel sections has been modeled using finite element analysis for an equivalent static stiffness and natural frequencies of about 12–20% higher than cast iron structure. Therefore, the proposed finite element model of epoxy-granite-made vertical machining center column can be used as a viable alternative for the existing column in order to achieve higher structural damping, equivalent or higher static stiffness and, easy and environmental-friendly manufacturing process.

Identification Method of Dynamic Characteristics of Joints in Jointed Structures

2013 ◽  
Vol 7 (2) ◽  
pp. 221-227
Author(s):  
Shinji Shimizu ◽  
◽  
Yoshiaki Kabaya ◽  
Haruhisa Sakamoto ◽  
Kenichi Yamashita ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Transfer Function ◽  
Dynamic Characteristic ◽  
Dynamic Characteristics ◽  
Vibration Mode ◽  
Joint Model ◽  
Characteristic Parameters ◽  
Element Analysis ◽  
Spring Element

In this paper, we propose a method of identifying the dynamic characteristics of joints in jointed structures. We first consider a joint model for finite element analysis. We then propose, based on the consideration, a method of identifying dynamic characteristic parameters of the joint, such as the spring stiffness and damping coefficient, with the joint model. As a result, we obtain a joint model with the spring and damping elements in vertical and tangential directions between a pair of nodes with changeable numbers and locations. The number and location of these elements can be determined so that the vibration mode and the inertance transfer function of the jointed structure obtained from finite element analysis with infinite stiffness of the spring element agree with those of the structure without joints. In addition, we identify the dynamic characteristic parameters of the joint so the experimental inertance transfer function and vibration mode agree with those obtained from the finite element analysis.

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