Advanced Materials Research Vols. 139-141

Abstract: This article through analysing coupler's structure, involute spline's stress situation, the tooth face contact intensity, the tooth root bending strength, the tooth root shearing strength, tooth face wear ability and the external spline reverse and curving bearing capacity carry on the precise computation and the examination, simultaneously a multianalysis bulge tight joint set of structure and the correlation computation examination, has established the shaft bossing compound coupler main spare part structure type. In this article based on the shaft bossing composite construction optimization design is targeted mainly flexibility swelling ring shape to optimize the design, change that flexibility swelling ring cone-cone angle, which makes flexible swelling ring Auxiliary T-twisting greater. In the analysis, it is necessary to use the software ANSYS, through the creation of the shaft bossing composite construction of the parametrization model, a flexible swelling ring cone-cone angle of the design variables and flexibility swelling ring allowable material stress as binding conditions, bulging with flexible support ring-twisting as the objective function of T,right propeller shaft coupler hub composite structure axisymmetric analysis, contact analysis and design optimization, inflation reached a flexible support ring largest T-twisting, work stress does not exceed the allowable material stress, elastic swelling ring-cone angle of the optimal solution.

Abstract: The availability of efficient and accurate metamodel for optimization computation is crucial to the success of applications of robust optimization of computationally intensive simulation models. To address this need, a framework has been presented for robust optimization on problems that involve high dimensional. The framework was combined with support vector regression (SVR) approximation model and a genetic algorithm (GA). The performances of SVR were compared with those of polynomial regression (PR), Kriging and back-propagation neural networks (BPNN). The results showed that the prediction accuracy of SVR model was higher than those of others metamodels. The applicability of the algorithm developed by combining SVR and GA was demonstrated by using a two-bar structure system study, and was found to be accurate and efficient for robust optimization. The optimization framework was effectively utilized to achieve a potential performance improvement.

Abstract: The different designs of rollers with varied convexity give different stress distribution and elastic deformation. It is directly related to the load capability and the life length of the roller bearing. With the Finite Element Method(FEM), by analyzing the stress distribution of roller busbar and raceway contact area in the design of different rollers with varied convexity of tapered roller bearing, the paper gets the best solution for the design of convexity of tapered rollers and the cause of roller bearings’ early destroy. The optimal result shows that the service life of this bearing has been improved by 93%. Hence, a more efficient method of improving the service life of rollers is got.

Abstract: Based on the torsion deformation the gear body and the contact deformation of tooth surface, the fundamental equations of load of the gear was presented, thus established the theoretical basis of the load derivation of the gearing. In this paper, the torsion deformation of the circular arc gears is analyzed first. Then the second order differential equation for the tooth surface load distribution of the involutes gears has been deduced. The equation for the load derivation of the spur gears is presented while the errors of original tooth surface are under consideration. Revision of tooth surface in order to compensate the load deviation of the plastic gears is presented in this paper.

Abstract: Ring rolling theory based on completion of the mold, rough and technical parameters of the design, application Abaqus software to build three-dimensional model of rolling, and the use of Abaqus / Explicit algorithm of external spherical bearing outer ring of cold ring rolling simulation and analysis come to different mold shape, size, structure and guide roller feed specifications on the forming process, reveals a spherical bearing outer ring of the mechanism of cold ring rolling, gets die structure is different, different size core roller, guide rollers with different combinations of cold rolling play a crucial role in forming quality. At the same time by rolling the solution results demonstrate the power of cold ring rolling of the nonlinear characteristics. Revealed the ring rolling process is a complex interaction of multi-parameter deformation coupling.

Abstract: The geometrical error modeling of the numerically controlled (NC) lathe is the key technique to kinematics design, precision analysis and error compensation. The study gives out the modeling process of the generally geometrical error model based on the multi-body system theory for the multi-axis NC machine tools. By the multi-system theory, using the low series body arrays to describe the complex mechanical system, the article has finished the geometrical error modeling of the numerically controlled lathe, analyzed the influence on the model of error of perpendicularity between the linear axes. The modeling method is highly-efficient and can not be affected by the structure of the NC machine tools. The error compensation and command correction can be implemented by the geometric errors model.

Abstract: This paper searched a way in order to solve relations between the structures and locking performances for vehicle safety-belt retractor, introduced the emergency locking retractor operating principles, including roll-up mechanism, bearing-strength mechanism, sensitive locking organization. Established the movement equations include the car-body which accelerates, the car-body lean and the pull out strap which accelerates, according to the equations of motion may the design performance parameters and structure parameters. Based on above research, applying MSC.ADAMS to dynamic simulation analysis, to make a analysis between the turn angle of strap-shaft and time, provided a check mean for improving performance of retractor, so as to accord the compulsorily standard ECE. R16: uniform provisions concerning the approval of safety-straps, restraint systems, child restraint systems and ISO fix child restraint systems for occupants of power-driven vehicles and GB14166-2003: safety strap and locking system used for adult passengers of vehicle.

Abstract: Though a lot of research works have been done, some key technologies of finite element simulation have not been resolved completely. A detailed finite element model of high speed orthogonal cutting of titanium alloy Ti6Al4V is developed. Several mechanics models of cutting process, such as material constitutive model, chip separation model and chip damage model, are implemented to improve finite element simulation accuracy. The chip shape and cutting force agree well with experimental results, which show the finite element model developed in this study is reasonable. Using this finite element model, chip formation process of titanium alloy Ti6Al4V is simulated. Results indicate that the material between the shear bands is only weakly deformed, and the deformation is stronger on the tool side of the chip. This work will be a base for process parameter optimization, tool’s optimization selection and design during high speed cutting of difficult-to-cut titanium alloy.

Abstract: For complex product design, many software and tools are used, and large scale intermediate data with heterogeneous formats and complex relationships are produced in preliminary design. Efficient organization and management of data are very difficult. The integrated design environments(IDE) are useful to solve this problem. This paper gives an overview on IDE and some correlative key technologies. According to characteristics of preliminary design stage, a framework of IDE is put forward in this paper and the system function components are analyzed. The framework includes some innovative methodologies, such as task-drove design by workflow management, design tools and software seamless integration, and design knowledge templates. The realization of IDE is presented to illustrate the applicability of the new framework.

Abstract: One of the fundamental innovations in the field of mechatronics is the direct material integration of mechanical and electronic functions using Molded Interconnect Devices (MID technology). Unlike conventional circuit boards, they are not limited to two dimensions but offer the possibility to arbitrarily lay printed circuit traces on the surfaces of the 3D carrier, traditional 2D routing function in EDA cannot be directly applied in MID design. In this paper, two new 3D automatic routing methods are introduced. One method is based on a grid graph and extends Hadlock’s minimum detour algorithm; the other is gridless and combines the A*-algorithm and an extension of Hightower’s algorithm. The related 3D routing functions, which are not supported by conventional MCAD und ECAD systems, are integrated in the design system MIDCAD. With these 3D routing functions, MIDCAD enables a more effective product design based on the MID technology.