Advanced Materials Research Vols. 230-232

Abstract: This study presents an accurate measurement method for measuring air pressure and temperature of air compressor when a reciprocating gas compressor performance. The design and main functions of the automatic acquisition and testing system for air compressor performance was introduced. The system has the advantages of excellent practicability, rapidity, stability, reliability, operability and good security feature. The system can give real-time process monitoring on test data and compile test reports of the reciprocating two stages compressor. The system can display, save and print performance curve, respectively.

Abstract: The (Ti,V)₂AlC/Al₂O₃ solid solution composite has been synthesized by in situ aluminothermic reduction of the blend powders of Ti, Al, V₂O₅ and active carbon. The phase evolution during the formation of the composite was examined at the temperature from 500 °C to 1400 °C. Based on the results of X-ray diffractometry (XRD) and differential scanning calorimeter (DSC), a possible reaction mechanism was proposed to explain the formation of (Ti,V)₂AlC/Al₂O₃ solid solution composite. Above the melting point of aluminum, liquid Al reacted with titanium to form the intermetallic compound of TiAl. As the temperature increased to 1300 °C, the intermetallic compound of TiAl reacted with TiC to form Ti₂AlC. The microstructures of the as prepared samples were also analyzed by the scanning electron microscope (SEM) together with the election dispersive spectroscopy (EDS).

Abstract: The self-catalytic role of zirconium n-propoxide has been investigated with respect to the synthetic parameters of ZrO₂/Y₂O₃-CeO₂ compound powders. When zirconium n-propoxide is prehydrolyzed, the gelation time is prolonged, resulting in a more transparent gel. It is found that gelation time can be shortened with a high concentration of tetraethoxysilane in the presence of a small amount of zirconium n-propoxide. On the basis of the synthetic data, a mechanism for the zirconium n-propoxide catalytic reactions has been discussed. A linear correlation between the mixing level and metal content holds up to 45 mol% of ZrO₂/Y₂O₃ under the studied conditions.

Abstract: Machinery industry changes with each passing day, asking for the more and more importance of the machinery industry performance. The innovative design needs to be used to tools designing for improving the work more efficiency. Take the wrench product designing as an example, this article analyzes the issue of the mechanical products innovation, applies the theories of the craft movement process to a manual wrench innovative design and puts forward the thought of the wrench innovative design scheme.

Abstract: The linear quadratic Gaussian Optimal control of a two-stage HFAC inverter system has been investigated in this paper. The uncertainty model of the high frequency resonant inverter is developed and analyzed with the input line and load variations taken into design considerations. The proposed control scheme has the advantages of fast response for both input line and load perturbations. It also ensures a wide range of system stability and guarantees robustness of the power converter. Both simulations and experimental results are provided to verify with the theoretical analysis through an experimental prototype with an output power of 500-W operating at 10 KHz and an output voltage of 24 V (peak value).

Abstract: In this work an interactive teaching tool related to the operable virtual 3-D laboratory has being presented. Though defining the lighting and material, and rendering the scene environment, a remarkable virtual laboratory appears as 3-D figures. As well as combining the ramble, animation and interactivity with the 3-D model, a realistic feel of the experiment presents to us. Data information combine with 3-D model achieve a realistic feel of the experiment and to enhance the students’ understanding of some complex concepts. Based on the virtual laboratory model, a group of experiments are developed, including wind tunnel, a Bernoulli equation rig and a stream line rig, etc.

Abstract: In allusion to facility corrosion problem in caustic soda industry five types of ni-Cr-cu alloy cast irons were developed. The corrosion rates of ni-Cr-cu alloy cast irons in hot concentrated alkali solution were measured by using self-made dynamic corrosion experiment equipment; the microstructures and surface corrosion morphology of alloy cast irons were observed by means of the optical microscope and SEM; the composition was analyzed using XES. Corrosion resistance mechanism were discussed detailedly. the experimental results showed that ni-Cr-cu cast iron was uniform corrosion macroscopically in the dense caustic soda at high temperature and there was ni, cu enrichment microcosmically. The Ni and Cu enriched in the matrix , which increase in local electrode voltage of the matrix,are advantageous to the improvement of caustic corrosion resistances of that zone. The higher Ni content,the better alkali corrosion resistance performance with high temperature.

Abstract: This paper is for refining database in the data mining process. Based on the analysis of the features and disadvantages of this decision tree algorithm and the substantive characteristics of data mining, we propose the concept of the core samples set and prove its invariance. On this basis, we build an attribute reduction method based on decision tree algorithm and then give a specific implementation steps, further, combined with a specific instance analyze the characteristics and efficiency of the method. Results show that the attribute reduction method based on the decision tree has good maneuverability and explicableness. This method can simply realize the attribute reduction of information system and its basic ideas completely adapt to the attribute reduction problems of the uncertain environment.

Abstract: In the developing of 2D non-contact anthropometry and application system, automatic pattern generation of men’s pants system is important component. Styles of men’s pants are single, and can be devised simply. In this paper, 6 kinds of devised styles are summarized by observing styles of men’s pants, which divide into landscape orientation, lengthways orientation and slant segmentation all included straight line and curve. After the users enter into automatic pattern generation of men’s pants system, they can choose devised style in the interface of design, and then related pattern can be automatically generated in the interface of pattern. In this paper, VS software is used to make programming, ganged style of pants in human body is realized by MATLAB, so the pattern can be automatically generated according to the rules of pattern and devised styles. This study provides the basis for automatic pattern generation of men’s pants system.

Abstract: Precise analysis on large-span spatial structures depends on accurate numerical material constitutive model, According to the axial tension stress-strain curve, the paper proposes a new numerical multiline material model, with material effects of intenerating effect, material hardening effect and damage effects considered, and corresponding calculation method applicable to beam element. Simulation of axial tension test and bi-level loading test on cantilever column proves that the material model and algorithm are effective and correct.