Applied Mechanics and Materials Vols. 26-28

Abstract: In this part, we present a 2-D four-point method to determine 3-D coordinate system in the application of automotive styling. This is a reverse transformation method according to the normal graphic projection transformation from 3-D to 2-D. Through choosing four certain or typical points from 2-D automotive sketches, the three planar angles can be calculated, and then the three spatial angles that control 3-D coordinate system will be determined. The angular relationships of the order-based pure rotation and the non-order-based rotation have been discussed.

Abstract: In this part, the perspective projection has been obtained if one more planar point is given according to the four planar points discussed in Part I. The precision of this reversing transformation has been investigated. The way to obtain four or five points from automotive sketches has been introduced. It has been implemented into a 23D system, and the results are satisfied.

Abstract: To guarantee the run effectiveness of the quality management system(QMS), a comprehensive evaluation system of the QMS’s effectiveness is brought forward. In the evaluation system, first the evaluation flow chart is set up; Second the evaluation index is given out; Third the evaluation result is given out by the calculate of the grey integration evaluation arithmetic. The organization can find out why the effectiveness of the QMS is weak and establish improvement measure from the comprehensive evaluation result.

Abstract: With influent distribution, high sludge concentration and low substrate state are carried out in ECOSUNIDE technics, bring in high nutrient removal efficiency. The “influent distribution” was introduced into conventional SBR for the treatment of municipal sewage, aiming to improve the nutrient removal efficiency. The whole process included an anaerobic and multiple anoxic/ aerobic units. The distribution ratios and modes are studied in this paper. The results show that the average sludge concentration reaches high to 6000mg/L. The influent mode has significant influences on the nutrient removal in the new SBR system. The mode of instantaneous influent in anaerobic stage and intermittent in frequent aeration stage is optimal, with the distribution ratio of 0.4/0.6, and the removal rates of NH3-N, TN and TP reach 99%, 87%, and 98%, respectively.

Abstract: This work presents the combination of fuzzy theory and rough set theory to solve facility location selection problems under the condition of involving different objective/subjective attributes. We try to utilize individual merits for each method and combine it to form a reliable selection of alternative suppliers. An empirical example is illustrated to show the effectiveness of the integrated method. Our results showed that the integrated method can allow decision makers to get the best candidate of supplier location, and is recommended in the practice therefore.

Abstract: The nano-TiO2 photocatalysts which loaded on hollow float beads were prepared by sol-gel process. The hollow float beads as carrier was modified by H2SO4 and the TiO2 sol was obtained by tetrabutyl titanate, the modified hollow float beads was added into TiO2 sol, the TiO2 gel was obtained, then calcined at 450°C, 500°C, 550°C respectively and obtained as-produced samples. Their property were characterized by TGA, XRD and SEM, Their photoactivity was evaluated by the photodegradation of the trace oil from fossil-fired power plant condensate under a series of temperature（15°C~45°C）, pH value（2~14）, initial oil concentration（5mg/L） and catalysts dosage（2.500g/L, 4.000g/L, 5.000g/L, 6.000 g/L, 7.500g/L, 10.000g/L）, the experimental results showed that as temperature at 35°C, pH value at 10, catalysts dosage at 5.000g/L and calcined temperature at 500°C, the trace oil degradation rate could exceed 90% in 12 h, the catalysts could provided a efficient method to degradate the trace oil.

Abstract: For the plate butt welding of the same materials with different geometry structures, the numerical simulation was adopted to analyze the influences of welding sequence on transverse and longitudinal residual stress in the process of multi-layer and multi-pass welding. The results show that when welding from the small geometric side to the large side, the peak values of transverse and longitudinal residual stress are min along the bottom or top axis of the weld. And the welding sequences of the foremost welds have little effects on transverse and longitudinal residual stress along the bottom or top axis of the weld.

Abstract: Considering the difficulty to precisely indicate the specified height for transparent or semitransparent thin liquid column, a novel fiber-optic liquid level sensor is reported which remarkably enhances the sensitivity by regulating the external light path based on the principle of light refraction. The structure and working principle of this sensor is introduced. A light path model is developed on the condition that the incident light ray obliquely penetrates the medium in the liquid level indicator. The formulae of deflection angle are deduced. Factors affecting the precision of the sensor are analyzed by means of an example. Finally the feasibility of this novel design is verified by experiments.

Abstract: To study the resistance-reducing effect of bionic surface on cone of screw pile for preventing flood and rushing to deal with an emergency, a number of bionic surface plates were designed based on the unsmoothed surface morphology of compound eye of ant, a typical soil animal. By using of scanning electron microscopy technology, it was found that the compound eye of ant was made of a lot of small convex eyes. These small convex eyes were arranged in dense style. On the surface of compound eye of ant, there were waveform characteristics. The cross section of compound eye was waveform curve which had continuous periods and amplitudes. Based on these characteristics, experiments of trolley were designed, including an orthogonal experiment for bionic surface plate and the contrast between bionic surface plate and smoothed plate. The results of trolley experiments showed that within the experimental factors and levels, the vertical loads on bionic surface plate and convex diameter produced greater effect of resistance-reducing.

Abstract: Unascertained clustering is an unsupervised clustering based on unascertained set. It is a method to make soft division of objects which is more scientific and realistic than the general one. According to the basic idea of unascertained average clustering, we write a specific procedure to achieve calculation by the MATLAB technology and then we verify the feasibility and effectiveness of the written procedures as well as the practical value and feasibility of calculation through case study.