Analysis and Calculation of Mechanical Structure Strength of High-speed Linear Motors for Electromagnetic Launch System

This paper describes the modeling and simulation of the Z axis of a five axis machining center for high-speed milling. The axis consists of a mechanical structure: machine head and electro-mandrel, a CNC system interfaced with the feed drive, and a pneumatic system to compensate for the weight of the vertical machine head. These subsystems were studied and modeled by means of: (1) finite element method modeling of the mechanical structure; (2) a concentrated parameter model of the kinematics of the axis; (3) a set of algebraic and logical relations to represent the loop CNC-Z feed drive; (4) an equation set to represent the functioning of the pneumatic system; and (5) a specific analytical model of the friction phenomena occurring between sliding and rotating mechanical components. These modeled subsystems were integrated to represent the dynamic behavior of the entire Z axis. The model was translated in a computer simulation package and the validation of the model was made possible by comparing the outputs of simulation runs with the records of experimental tests on the machining center. The firm which promoted and financed the research now has a virtual tool to design improved machine-tool versions with respect to present models, designed by traditional tools.

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Application of Experimental Modal Analysis Method in Researching of Mechanical Structure Dynamic Characteristics

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.694-697.370 ◽

2013 ◽

Vol 694-697 ◽

pp. 370-373

Author(s):

Zhang Yu ◽

Wen Zheng Cai

Keyword(s):

Modal Analysis ◽

Natural Frequency ◽

Dynamic Characteristics ◽

High Speed ◽

Experimental Modal Analysis ◽

Analysis Method ◽

Mechanical Structure ◽

Vibration Resistance ◽

Structural Rigidity ◽

Structure Dynamic

With the purpose of realizing the analysis of mechanical structure dynamic characteristics and inhibit vibration and noise, combined with the analysis of a certain type of high speed sewing machines vibration characteristics, we carry on the concrete experimental modal analysis, and compare the results of the experimental modal analysis with the results of spectrum analysis. The analysis results show that the second order natural frequency of the shell is close to two octaves under the normal working speed of sewing machine and it will lead to resonance. Enhancing the structural rigidity and the natural frequency under this modal to avoid resonance frequency is the key to improve vibration resistance of the structure.

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Modeling and Synchronous Control of Dual Mechanically Coupled Linear Servo System

Journal of Dynamic Systems Measurement and Control ◽

10.1115/1.4028688 ◽

2014 ◽

Vol 137 (4) ◽

Cited By ~ 12

Author(s):

Wu-Sung Yao

Keyword(s):

Machine Tool ◽

High Speed ◽

Dynamic Stiffness ◽

System Modeling ◽

Coupled System ◽

Mechanical Coupling ◽

Synchronous Control ◽

Linear Motors ◽

Operation Speed ◽

Control Scheme

This paper presents a system modeling technique for a high-speed gantry-type machine tool driven by linear motors. One feed axis of the investigated machine tool is driven by the joint thrust from two parallel linear motors. These two parallel motors are coupled mechanically to form the Y-axis while another standalone motor fixed to a support forms the X-axis. The components in the X-axis, which is treated as the mechanical coupling, are carried by the slides of the Y-axis motors. This configuration is applied to improve the dynamic stiffness of the system and operation speed/acceleration. However, the precise synchronous control of the two parallel and coupled motors would be the major challenge. To overcome this challenge, a multivariable system identification method is developed in this paper. This method is used to construct an accurate system mathematical model for the target coupled system. A synchronous control scheme is then applied to the model obtained using the proposed technique. The performance of the system is experimentally verified with a high-speed S-curve motion profile. The results substantiate the constructed system model and demonstrate the effectiveness of the control scheme.

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Development of Test Rig for High-Speed Railway Rolling Bearings

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.101-102.702 ◽

2011 ◽

Vol 101-102 ◽

pp. 702-707 ◽

Cited By ~ 1

Author(s):

Zhao Dong Huang ◽

Bo Qian Fan ◽

Xiao Ping Ouyang ◽

Ling Ling Xu ◽

Zhi Gang Wang

Keyword(s):

High Speed ◽

High Performance ◽

Rolling Bearing ◽

Main Shaft ◽

Heavy Vehicles ◽

Test Rig ◽

Rolling Bearings ◽

Heavy Load ◽

High Speed Railway ◽

Mechanical Structure

The rolling bearing test rig for heavy vehicles often works under heavy load and high speed, thus it requires high performance for the main shaft and mechanical structure. In this paper a design of test rig for high-speed railway rolling bearings is presented, in which a new structure is adopted to reduce the load on the support bearings. The basic idea is to position the load in a way that they can be balanced by each other.

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Application of Linear Servo Motor in Biochip Microarray Instrument

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.321-324.795 ◽

2013 ◽

Vol 321-324 ◽

pp. 795-798

Author(s):

Quan Liu ◽

Qiao Qiao Liu ◽

Xiao Fei Wang ◽

Xue Zhao

Keyword(s):

High Speed ◽

Ball Screw ◽

Servo Motor ◽

Direct Drive ◽

Improve Performance ◽

Positioning Accuracy ◽

Linear Motors ◽

Rotary Motors ◽

Automation Control ◽

Novel Design

A novel design to biochip microarray instrument is use of linear motors, in preference to conventional rotary motors driving ball screw. Three ironless core linear servo motors direct drive the X, Y and Z-axis motion, Improve performance such as superior positioning accuracy, high-speed operation and increased efficiency. The whole configuration for new microarray printing instrument is designed. Furthermore, the structure of special linear motors is also designed detailedly. And the linear servo motor automation control technology is introduced in this paper.

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