Coupled Vibration Modal Analysis of Synchronous Dual Ball Screw Feeding System

2013 ◽  
Vol 433-435 ◽  
pp. 8-11
Author(s):  
Zhi Yuan Rui ◽  
Yu Lin Tang ◽  
Rui Cheng Feng ◽  
Yong Li ◽  
Yan Rui Zuo
Keyword(s):  
Vibration Mode ◽  
Ball Screw ◽  
Feeding System ◽  
Coupled Vibration ◽  
Ansys Analysis ◽  
Machining Center ◽  
Modal Coupling ◽  
Coupling Characteristics ◽  
Vibration Modal ◽  
Screw Pitch

With the Synchronous Dual Ball Screw Feeding System used in a Milling-Turning compound machining center as the research object. For study the ball screw vibration modal, which using Lagrange established the dynamics equation and using the Lizs series expansion analyzing its various order modal coupling characteristics. Meanwhile using the ANSYS analysis to get the first three order vibration mode diagram and calculate the frequency corresponding to the critical speed for each rank. Through the analysis found that the screw pitch determine the modal coupling axial and corner, the workbench position and load quality changes, the screw vibration frequency also changes. Provide theoretical analysis for the analysis of dynamic characteristics of the next step.

Method of Coupled Vibration Control for Dual Rotor System With Inter-Shaft Bearing

2021 ◽  
Author(s):  
Yanhong Ma ◽  
Chenglong Shi ◽  
Bo Sun ◽  
Jie Hong
Keyword(s):  
Vibration Control ◽  
Mode Coupling ◽  
Weight Ratio ◽  
Low Pressure ◽  
Rotor System ◽  
Coupled Vibration ◽  
Coupling Vibration ◽  
Rotor Systems ◽  
Modal Coupling ◽  
Coupling Characteristics

Abstract Structural layout scheme of dual rotor system with inter-shaft bearing plays an important role in reducing the bearing frame and structure weight of areo-engine. This kind of scheme is often used in the design of high thrust-weight ratio turbofan engine. However, the inter-shaft bearing will cause the direct interaction of the force and displacement between the high and low pressure rotor systems, contributing to the coupling of the dynamic characteristics of two rotor systems. The coupling may eventually lead to the failure of the rotor displacement control, loss of the robustness of the connection structure or excessive dynamic load of the bearing. The main purpose of this paper is to, firstly study and quantitatively evaluate the coupling characteristics of the dual rotor system, secondly obtain the correlation between the structural feature parameters such as the position of the inter-shaft bearing and the coupling vibration or interactive excitation characteristics of the system, finally propose the coupling vibration control method of dual rotor system. The dynamic model of dual rotor system with inter-shaft bearing is established. The modal frequencies and modes of dual rotor system with or without coupling are analyzed and compared. The results illustrate the complexity of coupled vibration of high pressure and low pressure rotors. Then modal coupling characteristics evaluation parameter of dual rotor system based on energy distribution relationship is proposed. Using the coupling factor defined, the correlation between the inter-shaft bearing support feature and the modal coupling characteristics is discussed. The results show that, placing the inter-shaft bearing near the mass center of low pressure turbine can effectively restrain the mode coupling, meanwhile the proportion of bearing strain energy can also reflect the mode coupling characteristics of dual rotor system to a certain extent. Then a method of controlling the response coupled vibration of dual rotor system with inter-shaft bearing, based on the principle of mode superposition, is proposed. An example verifies the method can control the response coupling vibration of dual rotor system in wide speed range and under complex excitation conditions.

Modal Analysis of Ball Screw Based on ANSYS Software

2011 ◽  
Vol 314-316 ◽  
pp. 1981-1986 ◽  
Author(s):  
Qing Ke Yuan ◽  
Ya Nan Du ◽  
Yao Ding ◽  
Tong Le Wang
Keyword(s):  
Numerical Model ◽  
Machine Tool ◽  
Modal Analysis ◽  
Structure Analysis ◽  
Ball Screw ◽  
Feeding System ◽  
Ansys Software ◽  
Intrinsic Frequency ◽  
Vibration Model

Ball screw is an important part in the machine tool feeding system. This paper researches on the ball screw, establishes the 3D virtual numerical model by Pro/engineer. Modal analysis of ball screw is carried out in three different cases by ANSYS, then gets the intrinsic frequency and vibration model of ball screw. It provides reliable reference for further structure analysis of ball screw.

Research on the Secondary Compensation Method of the Screw Pitch Error Based on the Laser Interferometer

2014 ◽  
Vol 1061-1062 ◽  
pp. 966-969 ◽  
Author(s):  
Xuan Li Shi ◽  
Huan Lao Liu ◽  
Hao Li ◽  
Can Liu
Keyword(s):  
Laser Interferometer ◽  
Compensation Method ◽  
Ball Screw ◽  
Cnc Machine Tools ◽  
Cnc Machine ◽  
Positioning Accuracy ◽  
Pitch Error ◽  
Negative Effect ◽  
Low Efficiency ◽  
Screw Pitch

The screw pitch error of the ball screw is the primary error source of reducing positioning accuracy during the process of error compensation. When using the laser interferometer compensated the screw pitch error, it was difficult to eliminate the influence of the screw pitch error on the positioning accuracy just by the first compensation .this study proposed the secondary compensation method of the screw pitch error based on the initial compensation. in order to avoid the negative effect of the high prices of the automatic compensation software, the fallibility of the manual compensation and the low efficiency of the manual compensation, this article developed a pitch error rapid compensation software. the experiment result demonstrates that the precision index of the CNC machine tools and the efficiency of compensation can be improved obviously by comprehensive using the secondary compensation method and the pitch error rapid compensation software.

Analysis on Static Characteristics of Flipping Horizontal Machining Center

2014 ◽  
Vol 716-717 ◽  
pp. 577-581
Author(s):  
Rui Shao ◽  
Ding Wen Yu ◽  
Ping Fa Feng ◽  
Hui Shu Jia
Keyword(s):  
Static Analysis ◽  
Ball Screw ◽  
Electronic Document ◽  
Static Characteristics ◽  
Machining Performance ◽  
Machining Center ◽  
Interface Modeling

The worktable and the mainframe of the flipping horizontal machining center can be separated. The performance of the mainframe largely determines the machining performance of the whole machine. The deformation of mainframe under the application of certain forces demonstrates its static characteristics, which helps to find the vulnerable points for improvements. This paper mainly discusses the modeling of ball screw interfaces by taking into account the interface modeling. Static analysis is made by using Workbench to provide guidance for structural improvements.This electronic document is a “live” template and already defines the components of your paper [title, text, heads, etc.] in its style sheet.

scholarly journals The method for identifying of inaccuracy causes in turning machining center by processing a sample part

2021 ◽  
pp. 24-29
Author(s):  
D. A. Blokhin ◽  
◽  
A. G. Koltsov ◽  
Yu. A. Blokhina ◽  
M. M. Lakman ◽  
...  
Keyword(s):  
Test Procedure ◽  
Complete Information ◽  
Processing Method ◽  
Machine Errors ◽  
Machining Center ◽  
Control Surfaces ◽  
Accumulated Error ◽  
Screw Pitch

The article discusses the issues of the processing method of a turning machining center for processing the accuracy of processing a sample part. The model of sample part with the smallest possible control surfaces processed by various shaping methods has been developed to detect the amount of machine errors, such as the accumulated error of the screw pitch, or the axial non-perpendicularity, or the misalignment of the X and Y drives. This allows you to get more complete information of the equipment accuracy. A test procedure is presented according to the results of measuring each surface of the sample part

Rigid-Elastic Coupled Dynamics and its Application

2012 ◽  
Vol 629 ◽  
pp. 587-592
Author(s):  
Hai Yan Song ◽  
Li Fu Liang ◽  
Hai Bo Li
Keyword(s):  
Variational Principle ◽  
Energy Conservation ◽  
Conservation Law ◽  
Vibration Mode ◽  
Coupled Vibration ◽  
Governing Equations ◽  
Coupled Dynamics ◽  
Energy Conservation Law

According to energy conservation law, the functional of quasi-variational principle of rigid-elastic coupled dynamics is established. Quasi-stationary value conditions of quasi-variational principle of rigid-elastic coupled dynamics are derived. The governing equations of rigid-elastic coupled dynamics are obtained. As an application of rigid-elastic coupled dynamics, an approach of coupled vibration mode determined of unrestrained beam is established. The coupled vibration mode and coupled frequency are studied by the approach.

Analysis of Dynamic Characteristic of Numerical Remanufacture Machine's Feeding System

2010 ◽  
Vol 156-157 ◽  
pp. 1360-1365
Author(s):  
Qiu Lin Pu ◽  
Xiao Diao Huang ◽  
Wen Zheng Ding
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Operating Conditions ◽  
Ball Screw ◽  
Response Analysis ◽  
Feeding System ◽  
Nature Frequency ◽  
Grinding Machine ◽  
The Finite Element Model

In this paper,the ball screw feeding system’s dynamic characteristics of a numerical remanufacture grinding machine is analyzed using the FEM. Discusses the modeling method of ball screw system into the finite element model and established the combination of finite element model. Through the modal analysis and the harmonious response analysis, the nature frequency and vibration mode of the feeding system and typical operating conditions of excitation in the harmonic responsehave have been gotten,thus the dependable basis for the construction’s optimization and dynamic function’s increasing of the feeding system is provided, ensure the numerical remanufacture will be success.

Stability of Cracked Rotors in the Coupled Vibration Mode

1988 ◽  
Vol 110 (3) ◽  
pp. 356-359 ◽  
Author(s):  
C. A. Papadopoulos ◽  
A. D. Dimarogonas
Keyword(s):  
Harmonic Functions ◽  
Vibration Mode ◽  
Coupling Effect ◽  
Equations Of Motion ◽  
Vibration Modes ◽  
Coupled Vibration ◽  
Compliance Matrix ◽  
Stiffness Coefficients ◽  
Local Flexibility

A transverse surface crack is known to add to a shaft a local flexibility due to the stress-strain singularity in the vicinity of the crack tip. This flexibility can be represented, in the general case by way of a 6 × 6 compliance matrix describing the local flexibility in a short shaft element which includes the crack. This matrix has off-diagonal terms which cause coupling along the directions which are indicated by the off-diagonal terms. In addition, when the shaft rotates the crack opens and closes. Then the differential equations of motion have periodically varying stiffness coefficients and the solution can be expressed as a sum of harmonic functions of time. A method for the determination of the intervals of instability of the first and of second kind is developed. The results have been presented in stability charts in the frequency vs. depth of the crack domain. The coupling effect due to the crack leads to very interesting results such as new frequencies and vibration modes.

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