Key Engineering Materials Vol. 522

Abstract: In this paper, the precise 3D model of the wind power increasing gear was set up by based on the parametric designing method of Pro/Program, then the contact strength of the gear was analyzed by the FEM and the Hertz theoretical value was calculated, the FEM and the Hertz results were contrasted in order to confirm the applicability of the numerical analysis in wind power gear contact analysis. Finally, the corresponding analysis conclusion was received.The researching results offered a effective theoretical basis for the optimization design and analysis of the wind increasing gear.

Abstract: The variation of wind speed influenced by global warming is elaborated in this paper, the fitted curve of temperature and wind speed showed that the wind speed dropped with the increasing of temperature. Due to the climate changes, the distribution of wind speed of the original field was changed, and the utilization rate of raw wind energy was affected. The results show that: the original distribution of wind speed would been radically changed resulted from the global warming and the wind farm is no longer rich in wind resources, the best optimal lectotype of wind turbine is changing with wind speed changing. With the development of the technology, it is clear that the wind turbine with the lower starting speed and high power has more advantages.

Abstract: According to the Dabancheng wing farm weather conditions from 1971 to 2000, and its extreme temperature conditions, the performance change of 750KW wind turbine blade with them was researched in the article. Import UG Modeling to ANSYS, then achieve the static structural analysis and the heat-structure interaction analysis respectively. The results show that comparing aerodynamic-temperature loads with aerodynamic loads, the stress, strain and displacement of the blade is increased by 13.89%, 10.29% and 0.20%. Therefore, temperature changes have a certain impact on the blade performance. In the future, the temperature will be a necessary consideration during design of blade structure.

Abstract: In order to supply premium blades of Gang Saw for cutting stone, segments with diamond abrasive are supposed to weld onto the blade base in proper position. Analyze the requirements of the blades and put forward high precision location of the segment with respect to the blade base symmetry based on the double stochastic numbers for the longitudinal allocation and on the over-lapping principle of location for the symmetry. Accordingly the design of feeding and locating of both the blade bases and the segments are accomplished. Theoretically, the locating errors are zero, and the real locating accuracy reaches the level of micrometer, satisfying the need of applications in engineering. The feeding and locating system, together with the clamping devices, so designed for the blade welding operation works well.

Abstract: The foundation brake rigging is an important part of the railway freight cars, as it is an actuator of the rolling stock for deceleration and stop to ensure essential device for running safety. The mechanism clearance of the foundation brake rigging has a great influence on the brake shoe eccentric wear in the braking and releasing process. Especially during the braking process, the contact area between the brake shoe and the wheel tread is very small, resulting in the contact area with high stress. Actual operation manifests that on the upper side of the brake shoe wear severely. In order to build and analyze the model of the mechanism with clearance, the foundation brake rigging for the rigid-flexible coupling and multi-body dynamics simulation is carried out with the RecurDyn software, which provides the flexible body analysis module-FFlex. The method of resolving the problem is proposed, which includes the original model format conversion, the model preprocessing, constructing the rigid-flexible coupling dynamics model and analyzing the simulation results, and then providing the theoretical and technical support to improve the foundation brake system for railway freight cars by analyzing the main factors of influencing brake shoe eccentric wear.

Abstract: The rigidity of the sheet-metal shears blade carrier affects the shearing quality greatly. The straightness of the processed sheet-metal will decrease and burrs will increase if the rigidity is too low, which even leads to crack of the blade and decrease of the shearing ability of the sheet-metal shear. The model of the blade carrier in a new guillotine sheet-metal shear in Yawei Machine Tool Co., Ltd was established to study its rigidity. The distortion principle of the blade carrier was deduced using a finite element method. The analysis results are coinciding to the measurement result well. The method proposed in this study provides a guide to the design and intensity alignment of the blade carrier in guillotine sheet-metal shear.

Abstract: At first, mathematical movement model of six-bar mechanism of shaper was established with the vector analytic method. Then the geometrical model of six-bar mechanism of shaper was created by the simulation software ADAMS and kinematics simulation analysis on the model was carried out. The simulation results reveal the movement regularity and state information of plough head. By comparing the simulation results with theoretical calculation, the validity of this model and its simulation results were verified. Finally, through the parameterized modeling, how the length change of each rod of the mechanism to affect its performance was analyzed. Taking the plough heads working stroke as optimization objective, the optimal design of mechanism was realized. This method to use ADAMS to conduct simulation and optimization, on the one hand, greatly improves the research efficiency and shortens product development cycle, on the other hand, provides a theoretical reference for the actual mechanism design.

Abstract: The performances of automobiles rely on the engine in high extent, plus connecting rods are the main part of the engine, whose work environment is poorer and pressure is complex. In order to decrease the inertial force and add the span life of the engine, the weight of connecting rods is as litter as possible. Conventional design method is mainly dependent on experience. By means of soft ware of ANSYS, connecting rods are optimized when the structure of connecting rod is simplified, such as big end hole being a whole and taking no account of the interaction between bearing and bush. 45steel is chosen as a material and it must meet tensile strength, lower yield strength, impact toughness, and so on. The new connecting rod can save the material, compared with the conventional connecting rods.

Abstract: Static stiffness of fixed column jib crane directly affected operating and safety performance. Using ANSYS software for finite element analysis with the consideration of the combined effects of spiral arm and column and the whole structure, the integrated finite element analysis model was established for the whole jib crane and arm-side deflection formula for this type of crane structure was derived. Results verified the deflection formula and the reasonable camber design for spiral arm. Based on the verification, it is aimed to enhance the degree of static stiffness of crane, to improve its response to static stiffness of bend arm to set appropriate degree. In particular, arm deflection ensures correct calculation of static stiffness of the crane foundation, but also on the right arm to set an important basis for degree bend.

Abstract: Under the current situation of the rapid development of major equipment and technology, the research on measurement equipment, suitable for requirement of large-size application, is urgency and important. A light pen measuring system based on binocular stereo vision measurement principle is researched. The composition and working principle of the system are analyzed. Subpixel marginal fitting method is adopted to obtain the precise position of the center coordinates of the point of the coded marks. A mathematical model of the camera is Established, and the corresponding relations between the three-dimensional coordinates of the mark points in space and the two-dimensional coordinates of the same points in the image are deduced. In order to improve the speed and accuracy of image matching, the light reflection coded mark stickers are adopted as the marks of the light pen for imaging. The research on the key technologies of the light pen measuring system provides a theoretical basis for the further striking of three-dimensional coordinates of the space point, for the 3D reconstruction of the space model, and for the realization of software technology .