Advanced Materials Research Vols. 317-319

Abstract: This paper based on a kind of hybrid machine tool. The structure of hardware and the application of PMAC in the control system of the machine are introduced. This system uses double CPUS mode and the software is developed in Windows platform. Besides, the interpolation strategy and the interpolation algorithm for the machine are proposed

Abstract: This paper deals with the kinematics analysis of non-orthogonal 5-axis machine tools. A systematic kinematics model for all the non-orthogonal 5-axis machine tools is built by improving the robotic manipulation method. And the kinematics model of a special non-orthogonal RT 5-axis machine tool is analyzed as an example and the other type of non-orthogonal 5-axis machine tools can be analyzed in the same way. In addition, a postprocessor for non-orthogonal 5-axis machine tool is developed in Visual C++ 6.0 and the result is simulated in Vericut 7.0.

Abstract: This document analyses the surface of piston in two aspects, discrete points of axial section profile are fitted by cubic spline tool of MATLAB, interpolate curve after fitting with method of precision linear approximation. Equipartition of cross section profile are done,and through subdivision of points of equipartition,to approach theory contour. the number of divide points must satisfy the request was made, with the principle of the relative movement，in the processing of cross section in an ellipse，detailed analysis the motion of line motor，pointed out how changes the speed and acceleration of workbench.and must satisfy the basic conditions of the line motor to respond to the turning of cross section in an ellipse. On this basis, design a lathe machining CNC system of piston with structure of upper and lower computer, moulding of surface of piston are completed by upper computer, feed drive of X, Z axis and spindle are completed by lower computer, surface of middle-convex and varying piston are processed finally.

Abstract: The paper presents a case study: the review of the reliability centered maintenance (RCM) methodology realized in a hydrocracker. Applying of the reliability centered maintenance methodology, it finds 495 failure modes and ranks risk priorities for the 98 rotating machineries in the hydrocracker. According to the results of risk analysis, it provides customized maintenance strategies for each component of the hydrocracker, which would improve the safety of the hydrocracker effectively. The review provides helpful reference for other equipments in refinery factories.

Abstract: In this paper, differential capacitors sandwiched structure of a high-G capacitive microaccelerometer with round metal proof mass supported by multi-beam and its characteristic are presented. The operation principle and built-in self-calibration and self-test functions are described. The fabrication process and the fabricated chip of the microaccelerometer based on UV-LIGA technology are reported. The detection and closed-loop control circuits of the microaccelerometer are designed and calibrated. The range of the detection channel is ±6pF, the sensitivity is 89.3mV/pF, and the linearity is 2.59%.

Abstract: The study compared three processes of characteristics of Na2S precipitation, Fenton oxidation and coagulation. The results show that Na2S precipitation has the best treatment effect and convenient operation, but the processing cost is slightly higher. Fenton oxidation treatment effect is good, whereas the cost is high and more complicated process. Coagulation treatment is the lowest-cost and easy to operate, however the treatment effect is the worst. The research results have realistic instruct significance for the formulate process scheme of copper-complexes wastewater treatment.

Abstract: The effect of tinidazole on the zinc corrosion in 0.1mol/L KOH solution has been studied by polarization curves, electrochemical impedance spectroscopy (EIS), SEM, and weight loss measurements. It has been shown that tinidazole act as an anodic inhibitor, can effectively restrain the process of the anodic oxidation of zinc.The highest value of inhibition efficiency is 89.39% at 50mg/L concentration.

Abstract: With the rapid development of study on steel-concrete composite structure, the vibration response between bridge and vehicle under vehicle loads has been always attracted much attention. The performance between bridge and vehicle varies a lot with different section profiles. In this paper, the bridge and vehicle are considered as one interaction system for simulating space dynamic response for vehicle passing through the bridge. The calculation model of steel-concrete box girder with two boxes with double chamber and single box with double chamber are established respectively, their free vibration properties are calculated, and the dynamic properties are analyzed and compared. The coupling responses under different vehicle loads are discussed. According to the analysis and comparison, it can be found that flexural rigidity with two boxes with double chamber is smaller, when single vehicle and double vehicles passing the bridge the Vertical maximum dynamic deflection are 18.4% and 14.7% larger than that with single box with double chamber; the maximum accelerations are 2.69 and 2.3 times as much as that with single box with double chamber respectively, has low sensitivity on bridge-vehicle response. Through the comparison some helpful conclusions are given as reference of such bridges.

Abstract: The cross-spectral density function of the partially coherent beam on 1.06μm is extended based on the generalized Huygens-Fresnel principle by using the Gaussian Schell-mode(GSM) and the modified Frehlich spectrum. And on the analysis of variation of the beam spreading radius w with the initial emission radius w0, zenith angle θ and propagating distance z, the intensity distribution and beam spreading of GSM beam through atmospheric boundary layer turbulence are obtained under different distance. The results show that the beam spreading can be reduced at long distance for the suitable w0 according to the inflexion value of the curve. As well as, simulation results demonstrate that the modified Frehlich spectrum and the modified von Karman spectrum have little difference on the beam spreading for partially coherent beam propagating in atmospheric boundary layer turbulence.

Abstract: This paper focuses on an important research topic in data mining (DM) which heavily replies on the association rules. In order to deal with the maintenance issues within the background of the static transaction database, there are some minor changes to minimum support and confidence coefficient. A novel algorithm based on incremental updated is proposed, which is termed as NIUA (Novel Incremental Updating Algorithm). IUA uses association rules to mining the database, aiming at finding the potential information or finding the reasons from massive data.