Analysis of the Possibilities of the Usage of Electrical Synchronous Link for a CNC Gear Hobbing Machine

2006 ◽  
Vol 113 ◽  
pp. 97-102
Author(s):  
Kastytis Slivinskas ◽  
V. Gičan ◽  
A.J. Poska ◽  
Vytautas Kazimieras Augustaitis
Keyword(s):  
Dynamic Characteristics ◽  
Frequency Characteristics ◽  
Cutting Process ◽  
Dynamical Model ◽  
Mechanical Parts ◽  
The Third ◽  
Gear Hobbing

The method of creating the dynamical model of the CNC gear hobbing machine and for its analyzing is presented in this paper. The model comprises detail mechanical parts of the hob spindle and work spindle axes, their electrical counterparts, linking, and allows one to investigate dynamic characteristics of the machine and to simulate processes, which take place during gear hobbing. The article also presents the simulation diagram, introducing these axes and the third axis, which help to model the cutting process. It also presents results of simulation of processes during hobbing and amplitude-frequency characteristics calculated.

Investigation of Sensitivity Effect Based on Mass and Stiffness Modification in Automobile Crankshaft

2015 ◽  
Vol 752-753 ◽  
pp. 839-844
Author(s):  
R.M.S. Zetty ◽  
B.A. Aminudin ◽  
L.M. Aung ◽  
M.K. Khalid ◽  
H.M.Y. Norfazrina ◽  
...  
Keyword(s):  
Sensitivity Analysis ◽  
Natural Frequency ◽  
Dynamic Characteristics ◽  
Differential Analysis ◽  
Partial Differential ◽  
Mechanical Parts ◽  
Stiffness Reduction ◽  
Experiment And Simulation ◽  
Good Agreement

A modeling through sensitivity analysis is one of the promising methods to investigate the dynamic characteristics of complex mechanical parts. This study aimed to investigate the effect of sensitivity based on mass and stiffness modification in automobile crankshaft as a function of natural frequency. Verification for the crankshaft model that is used in the experiment and simulation was done and both results showed good agreement and small errors percentage. The modification was also done by reducing the different percentage of crankshaft’s mass and stiffness. Partial differential analysis was used in the sensitivity analysis in order to figure out the natural frequency after every set of modification. According to the results, we also found that there were changes of sensitivity value by changes in mass value but the stiffness value remains unchanged. However, there is no significant effect of stiffness reduction on vibration was found in this research.

Simulation Research on Micro-Milling Process Based on ABAQUS

2014 ◽  
Vol 901 ◽  
pp. 99-104
Author(s):  
Lin Hong Xu ◽  
Shu Lei Chen ◽  
Bo Lei ◽  
Xiao Shuang Rao
Keyword(s):  
Cutting Tool ◽  
Milling Process ◽  
Cutting Process ◽  
Micro Milling ◽  
Tool Geometry ◽  
Micro Fabrication ◽  
Simulation Research ◽  
Mechanical Parts ◽  
Milling Operation ◽  
Manufacture Industry

With the more and more micro mechanical parts are coming into the use of many fields, the micro machining is becoming a new tendency in the future manufacture industry. As a kind of common machining method, milling is also favor in the micro-fabrication field since its good machining precision and forming ability. In this work, cutting process simulation of micro-milling was done to analyze the influence of machining data and tool geometry on the cutting process such as temperature and stress distribution during machining by using ABAQUS software. The results from this simulation can provide some useful information for choosing reasonable cutting edge and machining data to improve surface integrity and prolong cutting tool life in micro-milling operation.

The Modal Analysis for the Third Type of Internal Gear Motor

2013 ◽  
Vol 690-693 ◽  
pp. 3023-3026
Author(s):  
Jun Zhang ◽  
Chun Ren Tang ◽  
Hong Mei Tang ◽  
Xian Hua Li ◽  
Meng Meng Niu ◽  
...  
Keyword(s):  
Modal Analysis ◽  
Mechanical System ◽  
Natural Frequency ◽  
Dynamic Characteristics ◽  
Mode Shape ◽  
Mechanical Systems ◽  
The Third ◽  
Internal Gear

It is significant to study the dynamic characteristics of the mechanical system. In order to prevent accidents such as resonance and self-excited shock, modal analysis of the mechanical systems should be analyzed. The mode shape of gears was analyzed to improving the design security. The sleeve, the planet gears and the internal gear of the motor were simulated. All order natural frequency, the mode shape of the motor was obtained. Research shows that motor running is smooth when the frequency is less than 4230Hz.

Research on the Frequency Dynamic Characteristics and UFLS Scheme in Shanghai Subzone Power Grid

2013 ◽  
Vol 291-294 ◽  
pp. 2291-2297
Author(s):  
Wen Qing Yang ◽  
Wei Cao ◽  
Zhi Gang Ding
Keyword(s):  
Dynamic Characteristics ◽  
Power Grid ◽  
Peak Load ◽  
Frequency Characteristics ◽  
Power Grids ◽  
Load Shedding ◽  
Transient Simulation ◽  
Simulation Program ◽  
Equivalent Model ◽  
Ring Network

Shanghai main power grid is operating in 500 kV ring network and with voltage-grading & district-dividing structure, and its subzone power grids have their own frequency characteristics. The paper has used district-dividing single equivalent model to check the parameters of components in BPA transient simulation program, and the original under frequency load shedding (UFLS) scheme was improved. Then the frequency dynamic characteristics of isolated subzone grid is analyzed, so does the adaptability and frequency safety of power grid under the new UFLS scheme in the condition of peak load in the summer of 2011.

scholarly journals Dynamic characteristics of mean type dimension lathe installed on rubber-metal anti-vibration supports

2017 ◽  
Vol 2 (5) ◽  
pp. 26-30
Author(s):  
А. Денисенко ◽  
A. Denisenko
Keyword(s):  
Dynamic Model ◽  
Elastic Deformation ◽  
Dynamic Characteristics ◽  
Nonlinear Dynamic ◽  
Vibration Isolation ◽  
Elastic Characteristic ◽  
Frequency Characteristics ◽  
Experimental Dependence ◽  
Proof System ◽  
Nonlinear Dynamic Model

On the basis of a nonlinear dynamic model of a vibration-proof system at power excitation there are formed amplitude-frequency characteristics of a lathe installed on rubber-metal anti-vibration supports, and an area of efficient vibration isolation is defined. An elastic characteristic of the model is presented as an approximating dependence obtained on the basis of the experimental dependence of support elastic deformation changes upon loading.

scholarly journals DYNAMIC PROCESSES OF THE RETROFITED REAR SUSPENSION OF THE VEHICLE

Transport ◽  
2004 ◽  
Vol 19 (6) ◽  
pp. 262-268
Author(s):  
Marijonas Bogdevičius ◽  
Raimundas Junevičius
Keyword(s):  
Dynamic Characteristics ◽  
Dynamic Models ◽  
Natural Frequencies ◽  
Dynamic Processes ◽  
Leaf Spring ◽  
Random Disturbance ◽  
Vehicle Speed ◽  
Air Spring ◽  
Rear Suspension ◽  
The Third

The main aim of the investigation is to design rear suspension and to improve the dynamic characteristics of the vehicle. Three types of rear suspensions that consist of a leaf spring, a hydraulic and a pneumatic damper, an air spring are designed. The dynamic models of the quarter car with these rear suspensions are presented. Random disturbance of particular road surface is played back by using a spectral density and Monte Carlo method. Natural frequencies of rear suspension are presented. The dependence of standard deviations of the first, the second and the third derivates of particular random displacements on the vehicle speed is obtained. Dynamic characteristics of three rear suspensions are compared and the best rear suspension is determined.

Dynamic Characteristics in Cutting Processses for Precision Machining

2007 ◽  
Vol 364-366 ◽  
pp. 265-271
Author(s):  
Shen Yung Lin ◽  
Y.C. Fang
Keyword(s):  
Dynamic Characteristics ◽  
Cutting Process ◽  
Precision Machining ◽  
Surface Waviness ◽  
Dynamic Cutting Force ◽  
Coupling Dynamic ◽  
Cutting Processes ◽  
Chip Separation ◽  
Cutting Model ◽  
Sinusoidal Surface

The accuracy and surface roughness of a machined component is strongly dominated by the dynamic characteristics of the machine tool while the most important factor related to precision machining is the dynamic behaviors during cutting processes. The main objective of this study is to develop a thermo-elastic-plastic coupling dynamic cutting model under large deformation for precision machining and so that the model can be used to predict several variations of cutting mechanics variables. The flow stress in the model is considered as a function of strain, strain rate and temperature and the critical value of the strain energy density of the workpiece is utilized as a chip separation criterion. A powerful FEM software is adopted to create a complete numerical solution for this model. During the analysis, the cutting tool is incrementally advanced forward in a step-by-step manner, from an incipient stage of tool-workpiece engagement to a steady state of chip formation. Three different dynamic cutting processes are introduced in this study, i.e., wave cutting, wave removing and wave on wave cutting. Various levels of frequencies, of amplitudes and of phase angle associated with different kinds of sinusoidal surface waviness are arranged during each simulation case. A whole simulation of dynamic cutting process is undertaken and the fluctuations of the dynamic cutting force during each dynamic cutting process are determined.

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