Dynamics Simulation Analysis of Column for NC Bevel Gear Grinder

2016 ◽  
Vol 693 ◽  
pp. 101-108
Author(s):  
Yong Wang ◽  
Qing Jian Liu ◽  
Tai Yong Wang ◽  
Yu Long Wang ◽  
Zhi Qiang Yu ◽  
...  
Keyword(s):  
Natural Frequency ◽  
Simulation Analysis ◽  
Structural Characteristics ◽  
Dynamic Stiffness ◽  
Element Model ◽  
Weighting Factor ◽  
Dynamics Simulation ◽  
Response Analysis ◽  
Quadratic Programming Method ◽  
Grinding Machine

To avoid the influence of column vibration on machining precision, it is necessary to simulate the stiffness characteristics of the columns for CNC grinding machine, and to optimize the structure of the column by using sensitivity method. Based on structural characteristics of the grinding machine and structural characteristics of the columns, a finite element model is established to simulate and calculate the first-four models of the columns. In order to optimize the structure of the column, a sensitivity analysis is made to calculate the sensitivity of natural frequencies and mass of the column to each panel and ribbed plate. Considering a weighting factor and taking integrated natural frequency of the column as an optimization objective, the mass of the column as a constraint, an optimization equation is established. By a quadratic programming method, the parameter optimization of the column is got as follows: the mass decreased by 4%, integrated natural frequency increased by 2%. Dynamic stiffness of the column has been optimized by harmonic response analysis, the results showed that the largest column in the Z resonance peak reduced by 8.44%.

The Research of Straight Bevel Gear Face-Hobbing Method on General Five-Axis Machine Tool

2016 ◽  
Vol 693 ◽  
pp. 1169-1176
Author(s):  
Yong Wang ◽  
Qing Jian Liu ◽  
Zhi Qiang Yu ◽  
Yu Long Wang ◽  
Yue Zhang ◽  
...  
Keyword(s):  
Natural Frequency ◽  
Structural Characteristics ◽  
Dynamic Stiffness ◽  
Element Model ◽  
Weighting Factor ◽  
Response Analysis ◽  
Harmonic Response Analysis ◽  
Quadratic Programming Method ◽  
Grinding Machine ◽  
Five Axis

To avoid the influence of column vibration on machining precision, it is necessary to simulate the stiffness characteristics of the columns for CNC grinding machine, and to optimize the structure of the column by using sensitivity method. Based on structural characteristics of the grinding machine and structural characteristics of the columns, a finite element model is established to simulate and calculate the first-four models of the columns. In order to optimize the structure of the column, a sensitivity analysis is made to calculate the sensitivity of natural frequencies and mass of the column to each panel and ribbed plate. Considering a weighting factor and taking integrated natural frequency of the column as an optimization objective, the mass of the column as a constraint, an optimization equation is established. By a quadratic programming method, the parameter optimization of the column is got as follows: the mass decreased by 4%, integrated natural frequency increased by 2%. Dynamic stiffness of the column has been optimized by harmonic response analysis, the results showed that the largest column in the Z resonance peak reduced by 8.44%.

The Finite Element Analysis and Optimization for the Grinder Based on the Joint Surface

2013 ◽  
Vol 281 ◽  
pp. 165-169 ◽  
Author(s):  
Xiang Lei Zhang ◽  
Bin Yao ◽  
Wen Chang Zhao ◽  
Ou Yang Kun ◽  
Bo Shi Yao
Keyword(s):  
Finite Element ◽  
Natural Frequency ◽  
Element Model ◽  
Joint Surface ◽  
Weak Links ◽  
Response Analysis ◽  
Element Analysis ◽  
Static And Dynamic Analysis ◽  
Harmonic Response Analysis ◽  
Grinding Machine

Establish the finite element model for high precision grinding machine which takes joint surface into consideration and then carrys out the static and dynamic analysis of the grinder. After the static analysis, modal analysis and harmonic response analysis, the displacement deformation, stress, natural frequency and vibration mode could be found, which also helps find the weak links out. The improvement scheme which aims to increase the stiffness and precision of the whole machine has proposed to efficiently optimize the grinder. And the first natural frequency of the optimized grinder has increased by 68.19%.

scholarly journals Design optimization of vehicle asynchronous motors based on fractional harmonic response analysis

2021 ◽  
Vol 12 (1) ◽  
pp. 689-700
Author(s):  
Ao Lei ◽  
Chuan-Xue Song ◽  
Yu-Long Lei ◽  
Yao Fu
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Natural Frequency ◽  
Asynchronous Motor ◽  
Element Model ◽  
Design Parameters ◽  
Response Analysis ◽  
Harmonic Response ◽  
First Order ◽  
Harmonic Response Analysis

Abstract. To make vehicles more reliable and efficient, many researchers have tried to improve the rotor performance. Although certain achievements have been made, the previous finite element model did not reflect the historical process of the motor rotor well, and the rigidity and mass in rotor optimization are less discussed together. This paper firstly introduces fractional order into a finite element model to conduct the harmonic response analysis. Then, we propose an optimal design framework of a rotor. In the framework, objective functions of rigidity and mass are defined, and the relationship between high rigidity and the first-order frequency is discussed. In order to find the optimal values, an accelerated optimization method based on response surface (ARSO) is proposed to find the suitable design parameters of rigidity and mass. Because the higher rigidity can be transformed into the first-order natural frequency by objective function, this paper analyzes the first-order frequency and mass of a motor rotor in the experiment. The results proved that not only is the fractional model effective, but also the ARSO can optimize the rotor structure. The first-order natural frequency of asynchronous motor rotor is increased by 11.2 %, and the mass is reduced by 13.8 %, which can realize high stiffness and light mass of asynchronous motor rotors.

The Static and Dynamic Stiffness Analysis and Strengthening Design of Internal Grinder Sharper Based on the CAE

2009 ◽  
Vol 16-19 ◽  
pp. 836-841 ◽  
Author(s):  
Zhong Hou Wang ◽  
Ke Song Li ◽  
Xiao Ling Zhou ◽  
Dong Sheng Zhao ◽  
Yun Bo Xie
Keyword(s):  
Cast Iron ◽  
Simulation Analysis ◽  
Dynamic Stiffness ◽  
Virtual Prototyping ◽  
Nodular Cast Iron ◽  
Weak Links ◽  
Original Design ◽  
Iron And Steel ◽  
Grinding Tool ◽  
Grinding Machine

Using software Pro/E and Pro/MECHANICA of the PTC, a method that establish a precise geometry and physical model(virtual prototyping) for the grinding tool of internal grinding machine, and simulate the dynamic and static characteristics of this virtual prototyping is introduced. Through simulation analysis, the weak links of the original design was found, thenthrough intensive design the static stiffness of the grinding tool increased two times, and the first stage of the inherent modal frequency was increased by 25%. Moreover, vibration dynamic response on nodular cast iron and steel shown the quantitative analysis results that nodular cast iron has good damping effect. Put the technology to practical application, the processing defects—chatter marks of surface quality when grinding round obtain a fundamental solution.

Structure Analysis and Optimum Design of NC Grinding Machine Tool Bed

2011 ◽  
Vol 80-81 ◽  
pp. 909-912 ◽  
Author(s):  
Xing Wei Sun ◽  
Jun Wang ◽  
Xin Feng ◽  
Ke Wang
Keyword(s):  
Finite Element ◽  
Machine Tool ◽  
Design Method ◽  
Dynamic Stiffness ◽  
Element Model ◽  
Technology Support ◽  
Advanced Level ◽  
Grinding Machine ◽  
Nc Grinding ◽  
Element Theory

The modern design method based on the finite element theory has become the essential means of present machine design. In this paper, dynamics finite element model of NC grinding machine tool’s bed has been established with the finite element analytic technique. Dynamic characteristic of processing has been studied. The optimization program of structure to lower the vibratory response has been designed. This advances the dynamic stiffness of bed. This research provides an essential theory and technology support for achieving the advanced level of the international similar machine tool on the aspect of machining precision, reliability and security.

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.

Principle and Dynamics Simulation Analysis of Varying Strategy of a Novel Variable Diameter Walking Wheel

2011 ◽  
Vol 308-310 ◽  
pp. 1875-1879
Author(s):  
Xin Bo Chen ◽  
Feng Gao ◽  
Sheng Zhuo Yao ◽  
Zhe Wang
Keyword(s):  
Theoretical Basis ◽  
Rational Design ◽  
Working Condition ◽  
Simulation Analysis ◽  
Element Model ◽  
Dynamics Simulation ◽  
Minimum Size ◽  
Variable Diameter ◽  
Nonlinear Contact

According to structure feature and principle of relying on relative rotation among hubs to realize elastic deformation of elastic spoke and varying diameter of a novel variable diameter walking wheel, finite element model was created based on the theory of continuous collision and the nonlinear contact between the wheel’s caster and ground was defined through introducing mobile marker in SIMPACK software. Dynamics simulation analysis was carried out respectively under two varying diameter strategies of the wheel and get the dynamic response in the mode of changing the diameter in situ and the minimum size of torque needing for varying diameter. The suitable for working condition and varying mode was pointed out via comparative analysis of the simulation’s results, and can provide theoretical basis for further rational design and study.

Dynamics Simulation Analysis of an Airborne Electronic Equipment Based on Ansys and Modal Test

2014 ◽  
Vol 945-949 ◽  
pp. 741-745
Author(s):  
Kai Shan Wang ◽  
Chuan Ri Li ◽  
Yue Chan Pang ◽  
Heng Hu Guo
Keyword(s):  
Printed Circuit Board ◽  
Simulation Analysis ◽  
Element Model ◽  
Electronic Equipment ◽  
Circuit Board ◽  
Dynamics Simulation ◽  
Test Technique ◽  
Modal Test ◽  
Equivalent Method ◽  
Random Vibration Analysis

In order to conduct dynamics simulation analysis on an airborne electronic equipment, total mass equivalent method is used to simplify the finite element model of electronic building brick. Considering this method’s disadvantage that it does not take into account the effect which the components have on stiffness of the printed circuit board(PCB), the modal test technique is carried out to recify the model and generate the equivalent stiffness of the substrate. Then the modal analysis and random vibration analysis are performed on the complete machine, calculating more accurate dynamics simulation results which provide a reliable qualitative basis for improving the vibration-proof design of the equipment.

Dynamic Response Analysis of the Reinforced Concrete Column under the Effect of Explosive Impact Load

2013 ◽  
Vol 681 ◽  
pp. 99-104 ◽  
Author(s):  
Yu Feng Chen ◽  
Guang Xiang Yi
Keyword(s):  
Finite Element ◽  
Large Scale ◽  
Simulation Analysis ◽  
Impact Load ◽  
Material Model ◽  
Element Model ◽  
Response Analysis ◽  
Reinforced Concrete Column ◽  
Rc Column ◽  
Finite Element Software

This paper does the data simulation analysis by using the large-scale finite element nonlinear ANSYS/LS-DYNA software. It chooses the MAT111(MAT-JOHNSON-HOLMQUIST -CONCRETE）concrete materials and the MAT3 (MAT-PLASTIC-KINEMATIC) reinforcement material model in ANSYS/LS-DYNA finite element software, builds the separating RC column finite element model, dynamically simulates the hurting process of RC column under the effect of explosive impact load, and mainly does research into the damage degree of RC column under different effects of explosive load of different peak pressures.

Reduction of High-Amplitude Cogging Torque Response in a 12,000 Horsepower Synchronous Drive Motor

2003 ◽  
Author(s):  
James M. Corliss ◽  
Siddharth Pant ◽  
Kevin Hui ◽  
Larry Duddy ◽  
Jon Veno
Keyword(s):  
Steady State ◽  
Natural Frequency ◽  
Damping Ratio ◽  
Element Model ◽  
Forced Response ◽  
Response Analysis ◽  
Torsional Vibrations ◽  
Cogging Torque ◽  
Adjustable Speed Drive ◽  
Adjustable Speed

A new 12,000 horsepower adjustable speed drive system has recently been installed in the NASA Langley 14- by 22-Foot Subsonic Wind Tunnel. The new system consists of a salient pole synchronous motor powered by a 12-pulse cycloconverter adjustable speed drive. During system commissioning the drive line torsional vibrations were measured with strain gages and a telemetry-based data acquisition system. Torque measurements were taken during transient and steady-state operations at speeds where the drive motor’s pulsating torques matched the drive line’s torsional natural frequency. Measured peak torsional vibrations during steady-state operation were comparable to values predicted by a finite element model forced response analysis. An unexpected oscillating torque occurred during low speed operations where the motor’s cogging torque matched the torsional natural frequency. The oscillating torque was higher than the mean torque at this speed, and the motor’s electrical flux was tailored in this speed range to reduce the response to acceptable levels. A half-power bandwidth analysis of the torsional resonances concluded that the torsional critical damping ratio of the driveline was approximately 0.7%.

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