Yi Lin Chi

Underdetermined Blind Separation for Bearings Faults Based on the Improved Morphological Filter

Aiming at the condition of the strong background noise, many interference sources and unknown the number of sources in the actual industrial field, a method based on multi-scale multi-structure close-open average combination morphological filtering(C-OACMF) and sparse component analysis (SCA) was proposed to deal with the blind source separation problem of rotation machines. First, the C-OACMF was used to filter out background noise signals and extract the characteristic signal of observation signals, then using the simulated annealing genetic algorithm of fuzzy C-average clustering algorithm estimates the mixing matrix, the linear programming is finally used to estimate the source signals. Through the actual environment composite rolling bearing fault vibration signal extraction experiments verify the effectiveness and accuracy of the proposed algorithm.

Study on the Standardized Design of Belt Conveyor Based on Synchronous Technology

Belt conveyor is widely used in all kinds of automatic production line and bulk material delivery is its important applications. In order to improve the operation accuracy of the belt conveyor, in addition to strictly control the production process, tracking the manufacturing process, the most important thing is to improve the design level and design efficiency. The research used Solid Edge ST4 three-dimensional synchronous modeling technology to complete 3 d model design of belt conveyer, at the same time for the standardization of belt conveyor design research. Standardized design uses synchronous modeling, modular design technology, top-down assembly modeling technology complete standardization process from scheme design to detail design. According to the structure characteristics of belt conveyor, the integral reasonable structure is divided into several modules, modules are related by key parameters. When you modify the parameters related to realize the automatic modification of model of the structure, the standardization of product design is promoted. Research focuses on synchronous modeling technology in three dimensional modeling design and application of a belt conveyor design standardization implementation, validating the fusion of synchronous modeling technology in different design module. Through the module assembly process, within the scope of certain and realize module exchange, so as to realize the belt conveyor series, universal design. To realize the standardization of structure design can reduce repeated design and design errors, thus greatly improve the engineer design efficiency.

Research on Kinematics Simulation of Turning Conveyor Based on ADAMS

With industrial technology developed, belt conveyor is very important that improve industrial production. Conveyor belt can avoid slippage, run deviation, and in turn. Belt conveyor conveys material fast and improves the efficiency. For realizing flat belt conveyor turning, this article complete plane conveyor to create 3 d model using Solid edge V20, and use dynamic analysis software ADAMS kinematics simulation of plane conveyor virtual prototype. Through a series of parameters setting and correction, we get analysis data and compare simulation results with the theoretical design results. Desired results show that the turning conveyor conveying speed is 0.6 m/s, turning radius is 1500 mm delivery targets within the scope of design to achieve the desired effect. Conveying material: smoke box (length x width x height, mm) 580 x 460 x 460, single weighing 25 kg. Thus, the technologies reduce design errors, shorten the product development cycle, and reduce development costs of new products. So that it improves production manufacture efficiency and product quality for the enterprise.

Study on Kinematics Simulation of Multi-Joint Robotic Gripper Based on ADAMS

The article describes how we can use the virtual prototyping technology validate mechanism design of multi-joint manipulator and its grabbing performance and loading abilities per minute. It completes the three-dimensional model of virtual prototype with Solid Edge ST5, and be imported into ADAMS software. And then the manipulator kinematics simulation is carried out in ADAMS. Using the kinematics simulation technology of ADAMS, we can get the various joints in a working cycle of the displacement characteristic curve, the velocity and acceleration curves of working conditions. This paper introduces how to establish the geometric model of articulated robot virtual prototype model. And some key technology details such as adding a constraint to model are also described. Kinematics simulation analysis of the manipulator with ADAMS software can greatly shorten the design cycle, improve design accuracy and reduce the cost of product development.

Design and Realization of the Birdsong Analysis and Identification System

On the basis of LabVIEW platform, a birdsong analysis system –Song Lab which has variety of analysis functions and able to handle the large amount of data files was developed. The related key techniques of system design and development are researched in this paper, including large data processing, color adjustment, the processing of feature information, etc. The function of large data processing is used to solve data reading efficiency problem, color adjustment are applied to adjust the appearance of the spectrogram plot, and feature information is used to realize the characteristics of information extraction, analysis and comment. Finally, the birdsong analysis and identification system is built and some substantiation analysis has been made with the sampled data using this software, the results indicate that this system has accurate analysis results; it can provide a good technical support for researches in the field of animal acoustics.

Study on the Cyclic Loading Effects to the Railway Ballast

When ballast materials are subjected to cyclic loading, as a result, the change of particles micromechanical properties will lead to ballast degradation, permanent deformations on the railways step by step. In this paper, it presented a coupling discrete particle-flow simulation model of the railway ballast for cyclic tamping loading. Tamping frequency changes from 25HZ to 60HZ in numerical simulation process. Simulation results that the ballast compaction rate increases linearly with frequency up to a characteristic frequency 35HZ and then it declines in inverse proportion to tamping frequency. The aim of this paper is to study on the effects on the railway ballast under cyclic loading. The study shows that the discrete element method is a valid method for investigation of the microscopic properties of railway ballast now, while we have no other better research method.

Design of Belt Conveyor Based on Dual Mode Modeling Approach of CAXA

This paper proposes a dual-mode modeling technology based on software- Computer Aided X Alliance (CAXA), and verifies the method with a belt conveyor as an example. The purpose of dual-mode modeling technology integrating innovation design pattern and engineering design pattern is to achieve a fusion between open design and accuracy design technology. Dual-mode modeling approach breaks single thought constraint owned by traditional parametric modeling, which has a strict relationship like father and son between part elements. By means of design example, this paper described the help that unique three-dimensional sphere functions only owned by CAXA give the solid modeling. This paper took belt conveyor for an example, introduced dual-mode modeling process and verified this approach. Combined with the help of the idea of modular design, this paper has accomplished assembly design of the driving motor module, roller device module and transmission device module. The results show that the design speed under the condition of dual-mode modeling can improve more than one time compared with the traditional methods, design error is greatly reduced and design efficiency is also greatly advanced.

Research on Vibration Characteristic of Tamping Device Based on SIMULINK

The requirements of higher speed, safety and more smooth and comfortable travelling are increasing strongly, this leads to the need of predictive maintenance of railway line, tamping machines have been used for this purpose. This paper presents the results of vibration characteristic of tamping device. Firstly, the basic working principle of tamping device was simply described; Then a simulation model of tamping device was established using SIMULINK in terms of mechanism principle; Finally, some vibration parameters were researched, such as velocity, acceleration, displacement of tamping device, which reflect the vibration characteristic of tamping device. In addition, the modeling process of simulation model was described, the function of SIMULINK was also simply recommended. The main aim of this paper is to propose an analysis method on facility vibration characteristic, which visualized reflects the kinematics characteristic of mechanism. The results show that the application of the technology can make the simulation process more visualization. The modeling process more simply, thus greatly improve modeling and simulation efficiency, and directly achieve our aims.

Study on Running Deviation and Adjusting Deviation of Belt Conveyor's Structure Based on Synchronous Technology

Belt conveyor is widely used in a variety of automated production lines and bulk material transportation is one of the most important applications. In order to improve the accuracy of the belt conveyors, it is need not only to strictly control the production crafts, more importantly, to improve the rationality of the structure and design level. Running deviation and adjusting deviation problem are important issues to be considered in a belt conveyor design process. In this study, the 3D synchronous technology of Solid Edge ST4 will be applied in the design of the belt conveyor to design a new type of anti-deviation structure. In the design process, we combine the synchronous technology with modular technology and top-down assembly modeling techniques to confirm the subject and adjust deviation. The key is the application of synchronous technology in 3D design and the new structure in Running Deviation and Adjusting Deviation. It turned out that the application of above technology can reduce design errors and avoids the repeated design, thus greatly improving the efficiency of the engineers design. Meanwhile, the study of running deviation can make the structure of adjusting deviation come true.

Numerical Simulation of High Speed Machining of Alloy Cast Iron

High speed milling of hard alloy steels utilized in dies and molds is a highly demanding operation. The finite element model was developed to investigate the high speed machining of alloy cast iron which is used in auto panel dies. The modified Johnson-cook constitutive model was used to model the complex dynamic material behavior, a damage evaluation law based on Cockroft and Latham model was used to simulate the ductile fracture of alloy cast iron. The crack initiation and propagation was simulated explicitly using an explicit FEM code. Simulation results showed that the chip morphology transited from continuous to saw-tooth chip with increasing cutting speed, cutting force decreased when increasing the cutting speed, which provide a useful understanding of chip formation process in high speed machining of alloy cast iron.