Advanced Materials Research Vol. 421

Abstract: The poor working condition and complex workload of coal mining machine lead to a big risk and a high cost for the test based on physical prototype, while the application of virtual prototype for simulation can acquire a comprehensive assessment of the reliability of product at the design stage. Parameters of working condition were obtained through the coal mine physical and mechanical property testing, and according to the coal-breaking mechanism and numerical analysis theory, the workload calculation and application methods of static and dynamic coal mining machines were analyzed with the examples of plow and shearer. In addition, the load calculation program was written in MATLAB. Based on interface technology, the rigid-flex coupled virtual prototype was established by the adoption of ADAMS, Pro/E and ANSYS, and then the problems in design were found through interference examination and dynamic analysis. The process above provided the basis for optimizing design.

Abstract: The top-down design method is effective to improve the designing efficiency of micro device. The manufacturability of the derived physical level model is the key point for the designing flow. A method to optimize the fabricating information of micro device from a feature-based design model is presented. The component-based constructing method involves functional components mapping, template based designing and 3D features constructing technique. Along with the designing flow, the vertical and horizontal parameters of the original model are revised by the key enabling technologies that are introduced briefly. With cooperative design mode, the process model derivation and optimization are accomplished simultaneously. This work provides designer a more intuitive way to design product by means of process verification to improve manufacturability.

Abstract: In this paper, firstly, a new type cam-linkage combined mechanism was briefly introduced. Secondly,the requirements of major components of cam-linkage reducer were discussed. And then, 3D parametrized design and virtual assembly for cam and other parts was realized by using Pro/E, and the interference of the whole reducer was detected, optimized design of componets was implemented. In the end, kniematic simulation of reducer model was analyzed. It is not only helpful to improve the efficiency of production design, shorten the design cycle and fulfill optimized and series design, but also useful to provide accurate models for FEM analysis.

Abstract: In the current market, the rotary sinus lift approach is developed by many manufacturers to substitute for the traditional osteotome technique. Sinus lift surgery can be achieved safely and accurately by using the rotary sinus lift approach. In this study, a three-dimensional elastic-plastic finite element model is used to simulate the contact stress between the sinus membrane and the sinus lift approach during sinus lifting process. Three different shape designs of the rotary sinus lift approach are explored. The results showed that the lift approach type A (flat top rounded corner shape) offers less damage and a higher lifting displacement of the sinus membrane during sinus lifting process.

Abstract: In this paper, in order to analyze and predict surface radiated noise, an engine with 6 cylinders is studied by advanced methods. The loads that the engine block is subjected and the modal participation factors can be obtained through multi-body dynamics calculation; by the finite element method, structural modes of the engine can be gotten; by the acoustic boundary element method and the modal acoustic transfer vector method, the acoustic responses on field points can be obtained. According to the simulation results, the acoustic power and the acoustic pressure distributions on field points and noise frequency characteristic can be identified when the engine is operating at different speeds, and the main noise source can be located. These results provide a reference for noise reduction and amelioration of the engine.

Abstract: As impacting and cutting role of the small jet, coal around slots occured violent displacement and expansion, increasing coal cracks, which greatly improved gas flow in coal seams and made for gas emission. The original coal stress changed and stress concentration belt moved to coal seams depth constantly. With gradual relief expansion and fracture increased, coal seam permeability coefficient increased, gas pressure decreased. Coal potentiality released, coal crushed and moved, a lot of gas with adsorption state changed free, then gas fully released and gas pressure gradient decreased, which reduced outstanding risk. it was determined that aperture size was 4/15 or so of roadway floor length using ANSYS finite element analysis software, thus roadway fissures developed full, and maintained rock integrity, in favor of speeding up the face driving.

Abstract: It discusses the measurement principle and the system design of 3D non-destructive measurement method for the homogeneous entity. The measurement project and its operating process is discussed. The basic operation principle and components of this measurement device are pointed out. It included the digitized minute entity cells and the delaminated measuring method for product profiles based on liquid. It is based on Archimedes' principle and lever principle and gravity moment, combined the equations of the gravity moment and the equations of the center of gravity, the 3D coordinate values of every minute entity cell in different layers can be reckon by computer. By inputting the 3D coordinate values of the product into the related CAD software system, the 3D model could be obtained. The principles, the system software were introduced in details about the measurement system of the homogeneous entity profiles. Proved through principium experiment, the system satisfies the request of the measuring precision. The measurement system is effective and feasible.

Abstract: This paper made an analysis on the process of turbine blade, and completed the three-dimensional design of milling and cutting fixture used in the process on the UG software. After the stress analysis of the workpiece is completed, the author made a finite element analysis on both the blades and the main parts of the fixture with the help of ANSYS software, the results of the research provide theoretical basis for the development of reasonable processing technology and reliable workpiece assembly.

Abstract: In order to efficiently design a fixture, it is necessary to establish a standard fixel library for CAFD system. Therefore, a SQL Server-based development technology is first employed to manage the parameterized fixel models. And then, in order to construct a fixel model, MFC is adopted to carry out the secondary development of Unigraph environment. Thus, arbitrary fixel can be dimension-drive designed according to a parameterized fixel model. The establishment of the fixel library can to a great extent reduce the trivial and repetitive tasks in the fixture design.

Abstract: Picking-up and clearing parts are the key device of the important work parts for the line chili harvesting machine, which directly affect the performance of the harvesting machine. In this paper, the working principle of the picking-up and clearing parts for the type 4LQ-1.6 line chili harvesting machine were explained, the structures of them were designed and the technical parameters were demonstrated. The virtual prototype was designed based on the analysis of Pro/ENGINEER and the physical prototype was made after that. Through the field performance test, the results showed that the device can accomplish the joint work picking, the function of clearing with mining net rate, low broken rate, high efficiency and reliability.