Research on the Vibration Attenuation of Heavy-Duty Machine Tool Based on Non-Obstructive Particle Damping (NOPD)

2011 ◽  
Vol 138-139 ◽  
pp. 799-803
Author(s):  
Wang Qiang Xiao ◽  
Dong Ping Duan ◽  
He Chuan Bian ◽  
Wei Li ◽  
Le Deng
Keyword(s):  
Machine Tool ◽  
Cost Reduction ◽  
Emission Reduction ◽  
Element Model ◽  
Milling Machine ◽  
Heavy Duty ◽  
Damping Effect ◽  
Vibration Attenuation ◽  
Particle Damping ◽  
The Finite Element Model

In this paper, the possibility of applying non-obstructive particle damping (NOPD) into the vibration attenuation for heavy-duty machine tool was analyzed and the experimental study on the characteristics of damping vibration attenuation was then carried out. First, the finite-element model for heavy planer type milling machine was built and then the stress state excited by the cutting force in the presence of the holes for filling particles located in the stand column was calculated. Secondly, based on the experiment, the acceleration time-domain waveform and the frequency response function (FRF) between NOPD application and the traditional solid cast-iron column of the planer type milling machine were obtained. Finally it is indicated that NOPD can effectively reduce the amplitude of vibration of heave-duty machine tool and has a good damping effect. Meanwhile, it has some additional effects, such as cost reduction, energy conservation and emission reduction.

Optimization Design of a New Heavy-Duty Self-Unloading Semi-Trailer

2011 ◽  
Vol 317-319 ◽  
pp. 2373-2377
Author(s):  
Guo Juan Shang ◽  
Gen Li Shan ◽  
Xi Juan Qi
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Optimization Design ◽  
Market Research ◽  
High Efficiency ◽  
Three Dimensional ◽  
Element Model ◽  
Loading Capacity ◽  
Heavy Duty ◽  
The Finite Element Model

Based on sufficient market research, a new model of self-unloading semi-trailer, whose maximum loading capacity is 30 tons, has been designed. The paper describes its overall structure, the three-dimensional diorama model and the finite element model of the frame. Based on the analysis of the models and the results of the calculation, the parameters of the frame are optimized. The advantages of the new design are as follows: the new design makes the most of the advantages of self-unloading trailers and semi-trailers, that is, self-unloading, security, stability, high efficiency, environmental protection.

Integrated Structure-Control Design of a Three-Axis Milling Machine

1999 ◽  
Author(s):  
P. De Fonseca ◽  
H. Van Brussel ◽  
P. Sas ◽  
J. Swevers
Keyword(s):  
Control System ◽  
Machine Tool ◽  
State Space Model ◽  
Subsequent Development ◽  
Element Model ◽  
Milling Machine ◽  
Integrated Simulation ◽  
Mechanical Structure ◽  
Multi Stage ◽  
Spatial Configurations

Abstract The paper discusses the development of an integrated simulation model of the mechanical structure and the control system of a three-axis milling machine for the super-finishing of moulds and dies. This integration encompasses the automatic reduction of a detailed finite element model of the machine tool into a low-order state-space model, appropriate for control system design. It is shown that a multi-stage component mode reduction and synthesis procedure allows a cheap analysis of the machine tool in different spatial configurations. The subsequent development of the motion and vibration control system fully exploits the knowledge of the dynamic behaviour of the machine for all possible tool positions, by a judicious selection of robustness weighting functions in an H∞ control theory framework. The idea of integrating the model of the mechanical structure and of the control system for a simultaneous optimisation of the machine tool performance is essential in the mechatronic design approach.

Dynamic Characteristics of Guideway Joints for CNC Machine Tool

2011 ◽  
Vol 80-81 ◽  
pp. 1051-1054
Author(s):  
Chun Xia Zhu ◽  
Bin Li ◽  
Ji Man Luo
Keyword(s):  
Machine Tool ◽  
Dynamic Characteristics ◽  
Optimization Design ◽  
Joint Stiffness ◽  
Element Model ◽  
Cnc Machine Tool ◽  
Regular Pattern ◽  
Cnc Machine ◽  
Harmonic Response ◽  
The Finite Element Model

In order to analyze accurately the dynamic characteristics of guideway joints of CNC, the finite element model(FEM) of guideway joints of CNC is built in ANASYS software, which that springs and damping units imitate guideway joints in this paper. The proposed method can predict the regular pattern which joint stiffness and joint span affect natural frequency and harmonic response. The research demonstrates that the method predicts well the dynamic characteristics of the guideway joints of CNC; therefore, it can be a reference for dynamic optimization design of guideway joints of CNC machine tool.

Simulation of Roll-Over Protective Structure and Falling Object Protective Structure Tests on Heavy-Duty Mining Dump Truck

2014 ◽  
Vol 529 ◽  
pp. 188-192
Author(s):  
Xuan Zhao ◽  
Wen Ming Zhang ◽  
Jue Yang
Keyword(s):  
Static Loading ◽  
Element Model ◽  
Steel Tube ◽  
Dump Truck ◽  
Protective Structure ◽  
Heavy Duty ◽  
Standard Methods ◽  
Mining Dump Truck ◽  
Square Steel Tube ◽  
The Finite Element Model

For evaluating the safety of the 220t dump truck cab, the roll-over protective structure/falling object protective structure with welding frame made up square steel tube is tested. The finite element model of the frame is developed. The static loading and impact loading simulations are launched by ABAQUS with ISO standard methods. The results show that all parameters accord the requirement. The welding frame cab can survive and protect the operator in roll-over or falling situation. It is a feasible, economical and flexible scheme for heavy-duty dump truck.

Static and Dynamic Characteristic Analysis of XDK650X Engraving and Milling Machine

2010 ◽  
Vol 34-35 ◽  
pp. 582-586
Author(s):  
Shi Guang Chen ◽  
Hong Lin Zhao ◽  
Zhi Heng Wu ◽  
Guang Peng Zhang ◽  
Bo Wang ◽  
...  
Keyword(s):  
Finite Element ◽  
Machine Tool ◽  
Dynamic Characteristic ◽  
Dynamic Stiffness ◽  
Element Model ◽  
Milling Machine ◽  
Static Stiffness ◽  
Characteristic Analysis ◽  
Interface Characteristics ◽  
Interface Parameters

To get an accurate prediction and analysis results of static and dynamic characteristics of the whole machine tool, finite element model should consider adding characteristic parameters to each pair of the combined interfaces when being built. Taking XDK650X engraving and milling machine as an example, integrating the combined interface parameters into the whole machine tool model with the help of finite element method, the dynamic model contained combined interface characteristics of the whole machine tool was built, and investigation on static and dynamic characteristic were carried out. Then, the relative stiffness between the tool and the platform was analyzed by using harmonic respond analyzing method. It was concluded that XDK650X engraving and milling machine has bigger static stiffness in three directions compared with other similar machines, but has comparatively smaller static stiffness in X direction, a bigger relative vibration amount between the tool and the platform in Y direction. Therefore preponderant natural frequency should be avoided in usage, the static stiffness in X direction and the dynamic stiffness in Y direction need for enhancement in structural optimization.

Automatic Mesh Generation of Complex Hollow Structures via Substructuring Into Box-Like Components

1991 ◽  
Author(s):  
Kazem Abhary
Keyword(s):  
Finite Element ◽  
Mesh Generation ◽  
Finite Element Modelling ◽  
Hollow Structure ◽  
Element Model ◽  
Milling Machine ◽  
Element Mesh ◽  
Hollow Structures ◽  
Automatic Mesh ◽  
The Finite Element Model

Abstract A method has been developed for finite element modelling of complex hollow structures. The structure is first simulated as a number of simple box-like substructures, then the finite element mesh is generated in each substructure, and finally the finite element model of the whole structure is built up through coupling the components together. An example has been illustrated by applying the method to the structure of a milling machine, which as a hollow structure is sufficiently complex.

Design and Optimization of the X Direction Sideway Face Camber Curve of Super-Span Cross-Rail

2013 ◽  
Vol 364 ◽  
pp. 3-9
Author(s):  
Li Gang Cai ◽  
Zhi Liang Wang ◽  
Tie Neng Guo
Keyword(s):  
Machine Tool ◽  
Machine Tools ◽  
Optimization Method ◽  
Deformation Curve ◽  
Milling Machine ◽  
Heavy Duty ◽  
Design And Optimization ◽  
Deformation Curves ◽  
The Impact ◽  
Element Method

As super-span cross-rail of NC heavy-duty planer type milling machine tool has a super span and heavy mass,it will deform seriously after installed. Machining an arch camber on X direction sideway in advance is used to compensate for influence caused by its deformation.Finite-element method is used to analysis deformation of super-span cross-rail when working.Multinomial is used to fit deformation curve based on deformation of the X direction sideway of cross-rail when bottom-slide and ram at each position.At the same time this paper takes into consideration of the impact on camber curve as the bottom-slides span brings about 2 deformation curves.A method based on 2 deformation curves is put forward to design and optimize the camber curve. By comparing various camber curves effect on the deformation of milling head,this article proves that the optimization method can effectively reduce the influence of cross-rails deformation on machine tools accuracy.

Numerical analysis of collision between a tractor-trailer and bridge pier

2018 ◽  
Vol 9 (4) ◽  
pp. 484-503 ◽  
Author(s):  
Luwei Chen ◽  
Hao Wu ◽  
Qin Fang ◽  
Tao Zhang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Impact Force ◽  
Element Model ◽  
Bridge Pier ◽  
Bridge Piers ◽  
Highway Bridge ◽  
Heavy Duty ◽  
The Impact ◽  
The Finite Element Model

Accidents involving collisions of heavy-duty trucks with highway bridge piers occurred occasionally, in which the bridge piers might be subjected to severe damage, and cause the collapse of the superstructure due to the loss of axial loading capacity. The existing researches are mostly concentrated on the light- or medium-duty trucks. This article mainly concerns about the collisions between the heavy-duty trucks (e.g. tractor-trailer) and bridge piers as well as the evaluation of the impact force. First, by modifying the finite element model of Ford F800 single-unit truck, which was developed by National Crash Analysis Center, the finite element model of a tractor-trailer is established. Then, the full-scale tractor-trailer crash test on concrete-filled steel pier jointly conducted by Texas Transportation Institute, Federal Highway Administration, and Texas Department of Transportation is numerically simulated. The impact process is well reproduced and the established model is validated by comparison of the impact force. It indicates that the tractor-trailer impact force time history consists of two or three peaks and the corresponding causes are revealed. Furthermore, the parametric influences on the impact force are discussed, including the diameter and cross section shape of the pier, cargo weight, impact velocity, relative impact position, and vehicle type. Finally, the finite element model of an actual reinforced concrete highway bridge pier is established, and the impact force and lateral displacement of the pier subjected to the impact of the tractor-trailer are numerically derived and discussed.

Finite Element Analysis of Damping Plate for the Airbag Vibration Damper

2012 ◽  
Vol 152-154 ◽  
pp. 1483-1486
Author(s):  
Jin Long Wang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Element Model ◽  
Vibration Damper ◽  
Element Analysis ◽  
Vibration Attenuation ◽  
Simulation Results ◽  
Displacement Diagram ◽  
The Finite Element Model

The finite element model of damping plate for the airbag Vibration Damper was established.Displacement and stress analysis of the damping plate structure was done by means of software ANSYS,and the displacement diagram and effective stress distribution of the of damping plate were obtained. The simulation results indicate that the bottom zones of damping plate , which bear considerably great forces,and the displacement variation of the hole have less influence, it could satisfy the demand of sustained vibration attenuation.

Finite Element Analysis for Static Stiffness of a Crankshaft Grinding Machine Tool

2014 ◽  
Vol 543-547 ◽  
pp. 76-79
Author(s):  
Ting Ting Guo ◽  
Teng Jiao Sun ◽  
Fang Shao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Machine Tool ◽  
Element Model ◽  
Machining Accuracy ◽  
Static Stiffness ◽  
Element Analysis ◽  
Technical Parameters ◽  
Grinding Machine ◽  
The Finite Element Model

Taking a grinding machine tool as an example, this paper obtained the static stiffness of the machine tool by finite element analysis method. The structure and technical parameters of the machine tool were introduced at first.Then, the finite element model of the machine tool was established. The static stiffness of the machine tool in x-, y-, and z-directions were simulated at last. The results show that, the static stiffness in x-direction is 2.0062×107 N/m, the static stiffness in y-direction is 0.821×107 N/m, and the static stiffness in z-direction is 0.2992×107 N/m. This paper provides advices for structure optimization of the machine tool which is convenient for improving the machining accuracy.

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