Mu Lan Wang

Application of Marginal Spectrum in Active Lamb Wave Damage Monitoring of Plate Structure

In this study, the marginal spectrum based on instantaneous parameter is applied to the active Lamb wave-based health monitoring of plate structure to investigate the marginal spectrum variation of the signals after being added with damage scattering signal. First,the active Lamb wave monitoring technology is employed to obtain the Lamb wave signals of the plate before and after damage. Then the marginal spectra of the signals before and after damage are obtained using the HHT technology and compared with the spectrum of the signals. The results show that the marginal spectrum can better describe the variation of the signals before and after damage.

Distributed Intelligent Field Information Processing for Agile Manufacturing

The ability of acquiring and processing information in manufacturing influences agile of manufacturing system. According to the idea that networked field information processing is realized based on intelligent nodes of field-bus technology, distributed intelligent field information processing flow is researched to synthesize multiple functions such as information gathering, information processing, warning system and field control. The method of information represented and collected was put forward. The multilayer data fusion model of distributed intelligent field information processing is built. Then the distributed LonWorks fieldbus monitoring model (DLFMM) based on LonWorks fieldbus technology is established. A monitoring system of a rail vehicle automatic door factory is shown as an example to illustrate design strategy of monitoring system based on DLFMM. This monitoring system shows that the model of distributed intelligent field information processing, DLFMM and the extraction and representation of information flow discussed in this paper are reasonable and applicable.

3-D NC Testing Platform Based on Motion Control Card

Researched the virtual-actual integrated technology based on the computer simulation test, 3-D NC test platform was mentioned using ′PC+Motion controller′as the core. In the VC++6.0 environment, the MFC series and the GT motion controller dynamic link library was used to realize multi axis linkage control function and 3-D NC control system software was developed. The “” vector control strategy and the SimPowerSystem module library was used to establish the system simulation of PMSM vector control model, Matlab software and InTouch software were used to realize the virtual simulation and associated debugging for control system and mechanical transmission system, the feasibility of numerical control testing platform was verified .

Control System for Digital Forming Machine of Lost Foam Based on PMAC

Control system is the key factor for performance of digital forming machine. To meet different needs, an open NC system structure is proposed based on PMAC. Selection of servo motor is analyzed, and hardware of control system is established. Software composed of multiple modules is developed with VC++, and also communication between PC and PMAC is realized. Furthermore, a method to optimize manufacturing process and interpolation path is presented according to characteristics of lost foam machining. Simulation and experiment are carried out, and the results confirm that the control system is excellent.

Experimental Research on Cutting Temperature of AISI 1045 in High Speed Milling Process

The aim of this paper is to investigate the time dependence distribution of workpiece cutting temperature in milling process. An experimental system used to achieve a measurement of cutting temperature in high speed milling is designed by use of the thermocouple and infrared thermal imager. The general regularity of temperature distribution is concluded, and the influence of the process variables such as cutting speed, cutting depth, etc. on the temperature distribution was investigated in detail. All the experiment results can be effective used to develop a new non-contact soft-sensing method for high speed cutting temperature prediction.

The Coupling Thermal and Mechanical Analysis of Machining Aluminum Alloy Work-Piece Based on FEM

The Cutting force and cutting temperature are the important factors which can affect the quality and accuracy of the aluminum alloy work-pieces. Based on the theoretical analysis of the cutting force and cutting temperature, the three-dimensional Finite Element Model (FEM) with the overall tool is established. The corresponding results of the digital simulation were researched, and the cutting force and cutting temperature were analyzed. The cutting temperature and cutting force changes were compared by altering the axial depth of cut and the feed rate. Keywords: Oblique cutting model, Finite Element Method (FEM), Cutting temperature, Cutting force, Aluminum alloy work-piece

Adaptive Genetic Algorithm for Hybrid Flow-Shop Scheduling

This paper studies the scheduling problem of Hybrid Flow Shop (HFS) under the objective of minimizing makespan. The corresponding scheduling simulation system is developed in details, which employed a new encoding method so as to guarantee the validity of chromosomes and the convenience of calculation. The corresponding crossover and mutation operators are proposed for optimum sequencing. The simulation results show that the adaptive Genetic Algorithm (GA) is an effective and efficient method for solving HFS Problems.

Efficient Prediction of Runout Parameters in End Milling Operation

This paper aims at studying a method to identify the cutter runout parameters for end milling. An analytical cutting force model for end milling is proposed to predict cutting force. The cutting force is separated into a nominal component independent of the cutter runout and a perturbation component induced by the cutter runout. Using the cutting force acting on the and directions to calculate the difference between the cutting radius of the adjacent tooth. Then runout parameters are obtained after a series of data processing. The simulation and the experimented results are made to validate the presented methods.

Modeling and Experiment of the Cutting Force for Aluminium Alloy Work-Piece

The application of Finite Element Method (FEM) in cutting force model for Aluminium alloy work-piece is useful to reduce the production costs and shorten the experimental period. Firstly, the theoretical model of the orthogonal cutting and the oblique cutting are analyzed in this paper. And then, the corresponding finite element models are theoretically constructed. By comparing the results, the following conclusions are drawn: with the increase of the cutting thickness, the cutting force increasing is in an enhancement tendency. The oblique cutting model of overall tool is more conductive to the subsequent runout and the flutter analysis.

Research on Servo System for CNC Machine Tool Driven by Permanent Magnet Synchronous Torque Motor

Permanent Magnet Synchronous Torque Motor (PMSTM) has the main characteristics of low speed, high torque, high precision and excellent stability, which can be applied to implement the direct driving technology for CNC (Computer Numerical Control) machine tool. In this paper, the mathematical model of PMSTM is simply introduced, and the various control strategies are discussed in detail. According to the requirement of high performance for PMSTM driving servo system in CNC machine tool, the corresponding suitable control method is employed in the feed servo system. The proposed scheme is also promoted to apply in the spindle system, the tool holder and the turntable of machine tool.