Materials Science Forum Vols. 628-629

Abstract: In the process of automobile braking, the interaction between the temperature and the dynamic stress of disc brake is a very complex work. In order to simulate this problem accurately, a three-dimensional finite element model was built. Meanwhile the displacement and thermal boundary conditions for solution were determined, in which the coefficient of convection varies with the transient changing of temperature and time. The distributions of stress field and temperature field of the rotor and pads in an emergency braking were analyzed by the direct coupling method. The results of analysis prove that the thermal-structural direct coupling method can simulate the interaction between the stress field and the temperature field more exactly than the axisymmetric method and sequential coupling method do. The changing of stress field is mainly influenced by the temperature field. The results extracted from coupled simulation can give references for the material selection and structural designs in the development of disc brake.

Abstract: This paper describes a fast reconstruction algorithm of implicit model based on 3-color octree structure for dense unorganized point cloud. At first, the point cloud is stored with an extended octree, 3-color octree. Aiming at this 3-color octree structure a new node watershed algorithm is presented with a higher efficiency to estimate the signs of subdivided leaf nodes. So the leaf nodes are divided into three types: interior, boundary and exterior nodes. To quickly reconstruct the model we sample the 3-color octree structure only at boundary nodes, which greatly reduces the number of sampled points. Then, the triangular meshes are extracted according to the relationships of boundary node. Finally the applications are illustrated in several point clouds, which shows the efficiency and precision of this reconstruction algorithm.

Abstract: The design of lifting device for a large-scale dynamic sculpture at tourist district was introduced. According to its own characteristics of lift device, the "back-to-back" style of rack and pinion for the lift system was designed. It was used the finite element analysis software to analyze the strength of the rack and pinion which is a key part of the lift device. According to the stress of dedendum for the pinion is too bad, it was proposed that increased the radius of the fillet for dedendum.

Abstract: The main objective of this study was to model and simulate a reduced three-dimensional (3D) model for researching the hoisting system of a Multi – rope Friction Winder. By introducing the relative nodal method, the simplified dynamic equations have been derived via the virtual work principle and validated on a virtual prototype with the RecurDyn software package. Kinematics and dynamics characteristic date are obtained by computer-aided dynamic simulation of virtual Multi – rope friction winder. The result is in accord with theoretical analysis. The research work will provide a powerful tool and useful method for the design of economic and credible elevator system. The approach can be generalized to analysis other flexible drive fields.

Abstract: Product cost estimation in early design stage puzzles researchers for long-time. A new product cost estimation model is proposed, which is applicable for few estimating samples and product information in early design stage. Similarity between the estimating product and the samples are calculated by model of Euclidean distance. Both of utilization ratio of estimating samples and reliability of estimation result are improved based on samples’ sequencing for effect of product cost. The cost estimation model is applied in design of claw of brake disc. The estimation result indicates that the presented model can be used for condition of few estimating samples and product information in early design phase.

Abstract: Magnetic abrasive finishing (MAF) is one of the advanced finishing processes, which produces a high level of surface quality. The technology is researched and applied just in recent years and it has good effect at the complex surface product manufacturing due to its flexibility and self-adaptability. Based on research about the theory and characteristic of magnetic abrasive finishing and 5-DOF Machine Tool, this study set up the interpolation mathematic model and space-line interpolations and circular arc interpolations of the tool-path for magnetic abrasive finishing were researched.

Abstract: In the design and optimization of cutting tool’s groove, it is necessary to comprehensively consider the multidisciplinary coupling effects of stress field, temperature field and working environment, and balance the coupling effects on the cutting performance. The multidisciplinary optimization method is employed to study the 3D complex groove reconstruction of cutting tools in this paper. The two-level reconstruction approach is proposed. The groove reconstruction of waved-edge insert is presented as a numerical example, and an optimal design of the groove is obtained. The optimization results show that the reconstructed tool has a satisfied performance on the stress field and temperature field.

Abstract: Reconfigurable machines are essential components to implement a reconfigurable manufacturing system. This paper focuses on one of reconfigurable machines: reconfigurable assembling machine. A reconfigurable automatic assembling machine for DC connector plug is designed. It can be divided into the basal module and the changeable module. The same basal module with different changeable module can be assembled into different special assembling machines for DC connector plug with different shape, size or number of electrodes.

Abstract: The cutting stiffness has notable influence on the sugarcane cutting quality, so great importance should be laid on enhancing the cutting stiffness when designing the cutting device. Based on cutting mechanism analysis, this paper proposes a new design of cutting device to increase the cutting stiffness by properly adding an auxiliary support bar and builds up 3D model of it. Then combining of virtual simulation analysis and physical experiment, it compares and analyzes the different stiffness and cutting quality with support bar in various support position or without it. The result shows that the new design with properly mounted support bar can raise 15.30% of the cutting stiffness, and consequently improve the sugarcane cutting quality distinctly.

Abstract: The MEMS capacitive gyroscope has wide application foreground, the reliability of MEMS gyroscope is a key problem for its commercial application. With the development of the MEMS gyroscope industrialization, the reliability is underway to meet the need of market. In this paper, the adhesion failure modes of the MEMS gyroscope were presented. In addition, the adhesion failure analysis was illustrated. Finally, a lateral comb structure to improve the reliability of the MEMS gyroscope was presented. Test result indicates that the reliability of the MEMS capacitive gyroscope is improved.