Advanced Materials Research Vols. 753-755

Abstract: This paper presents a parametric design method of the cam profile curve with UG NX, created the cam curves with law of the curve command, conducted curve continuity analysis with Curve Continuity Analysis command, and the results show that all adjacent curves are tangent continuous. This ensures the design accuracy. The velocity curve and the displacement curve were got through the cam motion simulation, and the motion analysis is consistent with the results of theoretical design. Expressions were changed, and the motion analysis show that the parametric design of the cam contour is reasonable.

Abstract: Stop motion generally characterized by plasticine model,wooden puppet or other mixed material together displayed by a series of related motion pictures, also be called "material animation". Therefore, material is of vital importance in stop motion, it reflects the specialty of every certain role that played in the animation through its own outer texture till the inner character.This essay below is to illustrate some suitable material in making stop motion by analyzing the texture that derived from the sensation features of the materials available.

Abstract: In view of the current global energy shortage crisis, ocean wave energy is development potential renewable energy, which is gaining more and more attention. This paper put forward use the water turbine absorb wave energy, and then generate electricity. It focus on the compose and generate mechanism of water turbine, and design structure of water turbine, and combine ocean wave theory and the flow control equation to analysis, through the method of machine design and FLUENT simulation, finally proved the water turbine had a high efficiency and has good application prospect.

Abstract: This paper separately analyzed the basic concepts and main points of QFD and TRIZ, discussed the relationship between the two theories and furniture innovation, and then proposed a innovative design model based on QFD and TRIZ, which mainly converts the users’needs into a contradiction matrix of innovative design through the HOQ and uses the creative principles provided by TRIZ to achieve the project design. Based on the example of small dwelling-size apartment’s furniture design, it elaborated the process of the innovative model and verified the effectiveness of the two theories used in furniture design.

Abstract: Elongation control played a vital role for the production of cold-rolled strip. In the production process, especially during tension disturbances or parameter variations, the conventional PID control method can not meet the actual demand well. Therefore, the intelligent control algorithm was introduced in this paper. A fuzzy self-adaptive PID closed-loop control strategy which combines the fuzzy control algorithm with the conventional PID control algorithm was applied to elongation control system. It is proved in the simulation study that the fuzzy self-adaptive PID control system has both high dynamic performance and static performance as well as strong robustness, which can greatly improve control accuracy and anti-jamming capability of elongation control system of the tension leveller.

Abstract: One important demand on spindle systems in modern machine tools is to realize higher rotational speed in order to increase the machining efficiency. So, the low rotational inertia and high fundamental natural frequency are indispensable. Because of advanced ceramics' extraordinary physical properties such as high hardness, low thermal expansion, light weight, abrasion resistant and good chemical and thermal stability, it accommodates very well the high-speed and precision requirements of machine tool spindles. In this study, a high-speed ceramic spindle system equipped with high-performance structural ceramic shaft and fully-ceramic ball bearings was designed and developed. The high-speed ceramic motorized spindle prototype was assembled with high precision successfully, and its performance test and analysis were finished. The test results show that ceramic motorized spindle can reduce the high-speed rotational centrifugal force and inertia force and increase the stiffness and rotation accuracy of spindle-bearing system greatly.

Abstract: The development of turbine blade root style is one of the key problems in the blade design technology as the root carries most of the loads of the whole blade. The optimal design problem and the corresponding numerical method were established for a straddle root structure with the minimum equivalent stress of the root and rim as the optimal objective. A multi-variable parametric model of the blade and rim, which took eight critical geometrical variables of the root and rim as design variables, was built by APDL (ANSYS parametric design language) and the optimal problem was numerically solved by combining pattern search algorithm with finite element method. The results indicate that the optimized structure has better strength performance, whose maximum equivalent stress of the root sharply decreased by 25.18% comparing with the original design. It eventually confirms the feasibility and validity of the proposed optimal design method.

Abstract: In order to get the deployable antenna with light weight but large size and high stiffness, this study investigated SMPC self-deployable driver mechanism based on the deformation mechanism of SMPC, and designed the SMPC space deployable antenna. The laminated shell structure with two pieces of back-to-back configuration was analyzed. Finite element analysis revealed that the reasonable central angle of the laminated shell cross-section was 90°. The ends fixing structure of the SMPC hinge was given. The function and structure of the hoop truss deployable antenna were designed to meet the functional and accuracy requirements.

Abstract: For improving threshing-cleaning rate of corn ears in the process of threshing and mastering relationship of threshing-cleaning rate of corn ears and moisture content of kernel, feeding form of corn ears, threshing roller speeds, the experiments of corn ears threshed under different feeding form of corn ear and different threshing roller speeds and different moisture content of kernels was proceeded on the threshing device with dual-feeding entrances. Experiment indicate : when the value of moisture content of kernel is 25%, threshing-cleaning rate of corn ears is lower than the value of 13.5% moisture content of kernel; when corn ear is fed from A feeding entrance, the impacting and threshing way is the main threshing way, threshing-cleaning rate of corn ears is high; when corn ear is fed from B feeding entrance, the way with different speeds threshing parts is the main threshing way, threshing-cleaning rate of corn ears is low; when corn ear is fed from A feeding entrance and B feeding entrance, threshing-cleaning rate of corn ears will increase with increase of threshing roller speed under same moisture content.

Abstract: Nowadays, reusable launch vehicle (RLV) has become a research focus of the transportation system between ground and space and the space weapon system. RLV plays an important role in controlling the cost of space transportation and performing the orbital mission. Since RLV would suffer from the aerodynamic heating inevitably during reentry, the thermal protection system (TPS) is designed to prevent too much heat transmitting to the vehicle structure and maintain the vehicle structure below a specified temperature limit. Several studies were performed to develop an understanding of not only the thermal and structural analysis of ceramic tile thermal protection system on the space shuttle but also the controlling factors of TPS. The TPS is subjected to the reentry heating and pressure profile of the Access to Space vehicle, and the transient temperature distribution and the resultant thermal stresses in the system are computed. Comparisons between various studies based on different assumptions were examined. By comparing these results with more realistic ones, the differences are evaluated. Results suggest that the TPS analysis must be based on reasonable and realistic parameters. Thus, engineers have to keep in mind that all parameters should be chosen very carefully to achieve results that close to practical ones.