Papers by Author: Yi Lin Chi

Abstract: 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.

Abstract: 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.

Abstract: Ballast degradation and unrecoverable deformation are emerged on the railway ballast track under the loads of high-speed and heavy loading locomotive. With the change of tamping frequency, a better understanding of the physics of compactness degree is important for long-time stability of ballast. This paper presented a numerical investigation of the bulk materials dynamics and the transient impaction of a system of irregular polyhedral particles confined with a rectangular box with a retaining wall subjected to cyclic tamping loading. Sphere packing method was being used in this study to simulate typical full-sized ballast particles. This paper aimed to establish firm-soft coupling particle-flow tamping operation simulation numerical model based on contact dynamics theory. This study checked the validity of the model while different tamping working conditions and out-loads was being implemented. The study shows that discrete element method (DEM) is an efficient method to reveal the rearrangement rule of railway ballast after the process of tamping operation.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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 engineer's design. Meanwhile, the study of running deviation can make the structure of adjusting deviation come true.

Abstract: Contact surface of nanoscale sliding friction represent some new features that are different from the macro scale sliding friction, which need to seek new analysis methods. Molecular dynamics simulation is an effective method to describe microscopic phenomena. Therefore, Molecular dynamics method was used to study mechanical behavior of contact surface of nanoscale sliding friction. A molecular dynamics model of hemisphere sphere sliding on rectangular solid plane was built. State change of the micro contact area and friction force variation in the process of sliding friction were observed and analyzed after solution and simulation. The results show that, at the beginning position of the sliding, with different contact depth, contact action region of hemisphere and plane generated the atoms displacement, re-arranged and close-packed accumulation is also different. The deeper the contact depth is, the greater the atoms close-packed accumulation is, and the greater the contact deformation is. In the process of sliding friction, the contact surface of the basal body has produced lattice destruction, surface upheaval and silicon atoms close-packed accumulation, and then formed furrow scratches. At the same time the silicon atoms of the hemisphere generated atomic migration obviously and adhered on the basal body surface. The top of the hemisphere was torn and peeled, which resulted in wear. The deeper contact depth is, the more loss of the material of the hemisphere is, and wear become heavier. The curve of friction force and sliding displacement in different contact depths shows that the deeper contact depth is, the greater friction force is. The friction force increases quickly at the beginning of the sliding. Then the friction force remains steady relatively at stable sliding phase. In subsequent sliding process, due to hemisphere was worn and the original contact surface changed in size, shape and configuration state, friction force decreases obviously. Besides, in process of sliding friction, due to stick-slip effect, friction force appears obviously fluctuations. Moreover, if the sliding speed is large the changes of sliding speed have less effect on friction force when the nanoscale sphere sliding on the plane at the different speeds.

Abstract: Corner conveyor is widely applied in all kinds of automatic transmission line, and it is the most important members in the family of conveyors. To improve the product quality and the precision of the corner conveyors, in addition to control strictly the production techniques and monitor its manufacturing process, the most important is to improve the design level and the design efficiency. In this paper, a new type of the side of the V belt drive friction with friction type of new structure will be studied by using Solid Edge ST4 3 d synchronous modeling technology. In the process of design, synchronous modeling, parallel design, modular design technology and top-down assembly modeling technology are combined with in the design of corner conveyor. With modular ideas for design of thought to consider the overall structure of design scheme, design will turn into different parts of conveying design module to consider, and promote the standardization of product design. The key point in this paper is that synchronous modeling technology is used in the three dimensional modeling of corner conveyor, and shows that the technology in different modules and the cooperation between different designers. The results show that the application of the technology can reduce iterative design process and design error, thus the design efficiency of engineer is greatly improved.