Applied Mechanics and Materials Vol. 151

Abstract: This paper introduces the affecting factors of tool clamping error of the axis direction in aspheric manufacturing process, and analyses the effects of tool clamping errors of the wheel along X and Y directions on processing area and contour error curve in depth in the aspheric manufacture parallel grinding, and calculates the relationship between tool clamping error of axis direction and aspheric shape error, and applies the theory in the machining process. The experiments show that the processing time decreases by 60% with satisfactory precision. The surface accuracy of 0.15 μm (0.237λ) of PV value and 0.023 μm (0.036λ) of RMS value can be achieved for 51.5 mm diameter aspheric surfaces. The theoretical analyses and error compensation methods are validated through the experiments, and the results show that the rapid process of aspheric surfaces can be realized.

Abstract: The centering deviation auto-detection and angle measuring error compensation method based on computer vision was proposed in the paper, aim at the centering deviation in the process of measuring the angle. The effect law to angle measuring error by centering deviation was analyzed, and the error compensation model was founded, The value and direction of centering deviation was detected by CCD fixed on the surface below theodolite, then the angle measuring error by centering deviation could be compensated by the error model. The automation degree of angle measuring was improved and the operation time was reduced.

Abstract: The method of incline degree automatic detection and dynamic compensation is proposed to eliminate the influence by vertical axis slop error. The vertical axis slop error compensation model is founded based on spherical triangle principle after analyzing the affect law to angle measuring by vertical axis slop error. The affect law to measuring angle of photoelectric theodolite by vertical axis slop error in the situation that the three axises are nonorthogonal is analysed according to shafting error model based on coordinate transformation, which indicate that the influence to measuring angle by each of the three axises error is independent and can be added. So the compensation model based on spherical triangle principle which is simple is also practicable in the situation that the three axises are nonorthogonal.

Abstract: Acrylonitrile grafted polypropylene for grafting modification of polypropylene. Different mass polypropylene-g-acrylonitrile (PP-g-AN) was blended with polypropylene. The aging behavior pattern of PP/PP-g-AN was studied on the condition high temperature and illumination. Mechanical properties of different blend ratios were systemic studied on different accelerated weathering process. The results indicated that acrylonitrile grafted polypropylene effective improved weathering resistant of polypropylene.

Abstract: For the sake of eliminating the temperature influence on the output of sensor, wavelet neural network(WNN) based on factor analysis is proposed, and the validity of the method is tested.It realizes screening and dimensionality reduction for primitive data through factor analysis(FA), decreases data redundancy regardless of related data, we make use of the nonlinear reflection ability and association learning ability of wavelet neural network, and proposes a model of pressure sensor temperature compensation. The result shows that the method is fficient for the problem of temperature drift，the stability of the pressure sensor is improved.

Abstract: In order to alleviate the glomeration of nanometer (SiC)p and improve its compatibility and performance, the chemical plating method was applied to get high-quality surface modification, and achieve the Ni/SiC composite particles. The dielectric and absorbing properties of the Ni/SiC particles were studied. The results showed that the modified SiC particles is nearly spherical, homogeneous morphology, and has a distinct core and shell parts. The different contrast of the shell indicated that more Ni is deposited on the (SiC)p surface, and the silicon carbide-nickel core-shell structure is formed. The dielectric constant, dielectric loss and magnetic permeability of the Ni/SiC composite particles have significant improvements compared with those of the original one. The dielectric constant rises about 24%, and R reaches -25.15dB when magnetic permeability up to 16.11GHz.

Abstract: In this paper, the passes of 25 # equilateral edge angle iron finishing mill group were designed, which included finished product pass K1, and the intermediate passes K2、K3、K4, also the finite element software ANSYS / LS-DYNA was applied for three passes rolling process simulation to verify the rationality of passes design, and the rolling force curve was simulated. It offers a reference for of 25 # angle iron processing.

Abstract: The present work focused on the study of preparing processes and the ferroelectric properties of a crack-free and PZT nanoparticle modified PZT thick film by alternately spinning technique. With the increase of the annealing temperature, Pr increased and Ec changed inconspicuously. When the thickness of PZT thick film increased, Ec decreased but Pr increased. For the 4μm-thick film, Ec and Pr were 23 kV/cm and 60 μC/cm2，respectively. The results also confirmed that the alternately spinning technique not only improved the film thickness, but also solved the membrane surface roughness problem of the thick film prepared by PZT 0-3 composite sol method.

Abstract: Bulk heterojunction photovolataic devices based on blends of conjugated polymer poly (2- methoxyl-5- dodecoxyl p-phenyl vinylene) (PMODOPV) as electron donor and crystalline ZnO nanowires as electron acceptor have been studied. We show that photovoltaic devices using zinc oxide nanowires overlaid with conjugated polymers give improved performance compared with devices made only from polymer. The improvement is consistent with improved electron transport perpendicular to the plane of the film. Solar power conversion efficiency of 1.37% were achieved under AM1.5 illumination .

Abstract: The complexity, nonlinear, fuzziness and dissipativity of interaction system between shearer cutting working mechanism and coal lead cutter cutting load to have obvious characteristic of uncertainty. Quantitative description and chaotic characteristics of cutting resistance curves are studied by application of the fractal and chaos theory; the conditions of coal leap damage are given according to the relation curves between stress and strain of coal, fractal damaged stiffness of coal. From the angle of chaos and fractal, mathematical relations between cutting evaluation index of cutting drive system and chaotic state of system evolution are given; the mathematical model of cutting drive system is found. By simulation, the results show the phase locus has time ergodicity and chaotic characteristic with cutting drive system in different bifurcation parameters, realizing the simulation of chaotic simulating load signal; cutting drive system properties have important significance to develop efficient cutting working mechanism.