Applied Mechanics and Materials Vols. 148-149

Abstract: The RV reducer backlash is well controlled by means of robust design. Some factors influencing backlash are analyzed and divided into controllable factors and uncontrollable (noise) factors. The requirements for experimental factors are met for robust design. The experiment analysis is proposed by using orthogonal experiment and G.Taguchi robust design for each of effecting backlash factors. The optimum parameters are obtained for maximum signal noise ratio (SNR). The contribution rate for each factor influencing backlash is presented. Finally, RV reducer’s backlash is well decreased and achieved ideal result.

Abstract: In order to design a robot end-effector for picking the litchi, at first, the clamping and cutting characteristics of the litchi stem were measured. Based on the biological characteristics and cultivation growth pattern of litchi, the characteristic of litchi picking mechanism was analyzed, and the relationship between the moving mechanism and cutting mechanism was established. At last, a new type of end-effector for picking the litchi, which consisted of clamping mechanism, moving mechanism and cutting mechanism, was developed. The experimental results showed that the end-effector can satisfy the clamping, moving and cutting requirements when picking the litchi.

Abstract: Analyzed defects of the domestic existing finite element analysis methods about boom structure, based on the programmed and automated construct concept of finite element model. Adopted processing way of consolidation to improve the contact problem of slide block and pin shaft, the analytical results was verified through the theoretical calculation, within scope of accuracy requirement, The modeling process of improved model is easy to realized programmed by Ansys of its own APDL language, provided a reliable menthod for modeling automatically of boom’s finite element model of truck crane.

Abstract: Life prediction is one important of Engine research. Take-off EGTM is an important parameter to monitor Engine performance. Take-off EGTM have great influence on Engine life, Reducing EGT will help to extend Engine life on wing (LOW), thereby reducing operating costs. Aiming at Engine condition monitoring, the definition of take-off EGT Margin is given, estimation methods and their application on Engine life prediction are discussed.

Abstract: The relation between the load and the damage on the axle press-fit part is analyzed according to the load on the axle. Abaqus is used to calculate the load-strain transfer coefficient of measured points on the axle press-fit part. The stress spectra are got by load identification. Using GoodMan equation, the equivalent stress spectra on the press-fit part are obtained. According to the equivalent stress spectra, the damage on the axle press-fit part is analyzed.

Abstract: In this paper, we suggest a different way to improve the utilization of joystick in our daily life, especially for those who commonly use joystick in matlab simulink environment as a controller. By modifying potentiometer that acts as a variable resistor we can process signal from joystick with interfacing it on block in simulink to change to another function (ex. Low-cost sensor) or extend the limitation joystick itself when acts as a controller. With some applied mathematical calibration regarding the functionality for certain condition then the low-cost development approach for unmanned vehicle could be achieved.

Abstract: For the purpose of improving the capability of multi-disciplinary collaborative design process of domestic aero-engine, a novel methodology of optimized work breakdown structure based on the concept of maturity is proposed on this paper. The definition of maturity and the key factors of maturity are given firstly, and then a working mode of breakdown structure based on maturity is detailed. A sample of compressor of aero-engine is demonstrated on a re-developed TeamCenter platform.

Abstract: In the area of modern product design, there is a tendency of adding increasing intelligent element, however, users may encounter problems in using products. Originally, designers may want to solve the problem better, but they just went to the opposite side. We need a very natural form of interaction, this interaction can be easily occurs in the subconscious. Natural interaction is the exchange of implicit, natural sound and time, a signal quiet but can be detected, and there are displays of products and layout to the real world with the corresponding natural. We follow this principle in product design, in order to make our products more emotional, more user-friendly, and it will also allow us to enjoy products’ greatest value.

Abstract: The 3D surface measurement methods are described based on the single and multi-frame fringe projection principles, respectively. The key algorithm  phase reconstructing (PR) is conducted by means of two different concepts; one is the single-frequency spatial phase reconstructing method and the other is the multi-frequency temporal one. On the side of spatial PR, a few typical methods are carried out, among which the most robust one could be achieved. The described spatial methods are implemented under the guide of the suggested modulation gradient variance (MGV) map. Moreover, the network programming (NP) method is also conducted to compare with them. The tested results show that the weighted least square (WLS) is the most robust one among the spatial PR methods. At the same time, the temporal PR method is introduced based on the multi-frequency fringes, and the result proves that it features the better noise immunity and robustness than spatial ones, but needs many different frequencies of fringes that would be more time-consuming. Lastly, the surfaces are reconstructed in reverse engineering (RE) software.

Abstract: Melt blowing process can produce superfine fibers. In this processs, the polymer is drawn by high velocity hot air. Lagrange method is empolyed to establish and solve the polymer drawing model. The fiber diameter and vibration are predicted with the model. The predicted fiber diameter concides with the experimental data. The fiber vibration becomes larger and larger with the increase of the die-to-collector distance. Computer simulations show that higher initial air velocity and higher initial polymer temperature can producefiner fibers while initial airtemperature contribute little to the polymer drawing.