Applied Mechanics and Materials Vols. 300-301

Abstract: Solar powered intellective vehicles (SPIVs) not only focus on energy saving and environmental protection, but also have finer feasibility. The design of extended range in SPIVs is a kind of the important directions that low carbon green vehicles will be design in future. We will reflect demanding design of extended range shoot to convert the target design level. The optimal design is actualized for photovoltaic array collocation of solar energy in SPIVs. The “zero oils consume, zero exhaust, increment drives distance” demand of SPIVs are carry out by the vehicle with design carries to net electrical source system of extended range.

Abstract: This paper develops a CO₂ laser camera by using an ARM embedded system with a CCD camera. The power controller, embedded on an FPGA chip, controls laser cutting depth by modifying the DPWM power controller for a CO₂ laser machine. The relationship model between feed rate, laser power and cutting depth was trained by the adaptive neural fuzzy inference system (ANFIS). Laser power output was determined by the grayscale level in the image from CCD camera to reproduce a bitmap image in a 2.5D engraving. The maximum laser cutting depth was 4mm, and the feed rate varied between 10mm/s and 80 mm/s. Laser power was less than 48W. The precision for the cutting depth in the model was less than 0.036mm. The precision for the actual cutting depth of the laser was within 0.044mm. Implementation of the model improved the precision of the laser cutting machine to within the range ±0.05mm.

Abstract: In order to provide effective power for small aerocraft, this paper offers a design of an electromagnetic vibration energy harvester based on MEMS technology, which works in special launching environment. According to "mass-spring-damper" system theory, this paper firstly built a model of the pick-up system, and discussed the pick-up system's response to sinusoidal input and impact load. Then, an energy conversion system was modeled, in order to analyze the system's power output. ANSYS simulation has been done on the pick-up system of different structures & parameters, and the relationship between different structures & parameters and the energy harvester voltage output has been studied. Based on the theoretical analysis and software simulation, the designed energy harvester working high frequency vibration environment can produce voltage over 200mV, which is enough for micro-sensor, low-power circuit in aerocraft.

Abstract: Based on the framework of Stackelberg game, we analyze and compare the optimal channel choices for the manufacturer and the retailer under consignment contract, when the demand is stochastic with uniformly distributed shock in multiplicative and additive forms respectively. We find that the price elasticity, range of demand fluctuation and the revenue sharing ratio affect the optimal channel choices for the manufacturer and the retailer differently under different forms of stochastic demand shocks.

Abstract: Pointing-lapping is a lapping way for modifying tooth surface defects of hypoid gears. For numerical control, V/H/J calculation principle of pointing-lapping of hypoid gears is introduced. According to mesh relations and coordinate relations, 8 nonlinear equations are formed on the basis of mesh theory of hypoid gears. V/H/J can be got by solving the nonlinear equations, which can be finished easily by computation program. The accuracy of the calculation principle has been proved by tooth surface contact pattern test in Y9550 roll checking machine.

Abstract: First a 3D model for frictional roller of endless-rope winch was established with Pro/E software. And then the model was imported into finite element software named ANSYS Workbench, by which, the stress and deformation distribution of frictional roller could be acquired after meshing and loading. Next by making use of the Design Explorer module of ANSYS Workbench software, the paper analyzed the sensitivity of the major structure parameters which influence the roller strength. On the foundation of sensitivity analysis, these parameters were optimized to make the structure of the frictional roller more reasonable and meeting the design requirements.

Abstract: An optimization of loss models for performance prediction of centrifugal compressors has been conducted in this paper. A centrifugal compressor with vaneless diffuser (VLD) and vaned diffuser (VD) is selected for the present study. The study begins with a numerical analysis, using commercial software ANSYS CFX. The numerical result is used to modify mean streamline analysis loss models. Matlab optimization toolbox is used for this purpose. Also, a matlab program is compiled to calculate the off-design performance of the centrifugal compressor. The results show that after optimizating the loss models, mean streamline analysis has a better accuracy than before.

Abstract: Since different types of 5-axis milling machines have their own unique rotation mechanisms, the solutions developed to generate numerical control (NC) data are traditionally targeted toward specific mechanisms and are obtained via specific methods, normally resulting in complex algorithms. In order to resolve this problem, this paper proposes an instinctive method to convert cutter location (CL) data to NC data for non-orthogonal table-type 5 axis machines. The rotational angles of the two rotational axes can be easily derived from the tool-orientation vector, and the coordinates of the three linear axes in the NC data can be easily derived from the rotational angles and coordinates of tool position. Even more, this method enables the development of a generic algorithm for the rotation mechanism of any 5-axis CNC milling machine.

Abstract: Aimed at the characteristics in development of auto parts enterprises' production, the evaluation index system is built from design flexibility, patent strategy ability and project management capacity during production development, the evaluation methodology of BP neural network technology for technology innovation capability during development of auto parts enterprises’ production is used. The evaluation methodology is verified by taking the Automobile steering device company for example.

Abstract: The stress relationship between several pairings was studied through the contrastive contact analysis between the artifical knee-joints of the same type pairing and similar type pairing in different angles and conditions to expand the application of the existing artifical knee-joints. The result shows that, the maximal equivalent stresses of the artifical knee-joints of similar type pairing are more than those of the artifical knee-joints of the same type pairing generally. The law is especially clear in conditions of larger force. In conditions of walking on the flat ground and climbing the stairs, the stress growths between 4/3 pairing and 3/3 pairing are the largest in 10° , they are 18.3% and 14.5% respectively; the stress growths between 3/2.5 pairing and 3/3 pairing are the largest in 20° , they are 13.4% and 15% respectively.