Advanced Materials Research Vols. 211-212

Abstract: In this study, a linear ultrasonic motor using longitudinal and bending hybrid transducer is proposed, which contains two exponential shape horns located on two ends, and the end tips of the horns are used as the driving feet. Two groups of bending PZT ceramics are set in the middle of the transducer, and two groups of longitudinal PZT are set between the bending PZT and two horns, respectively. In this new design, longitudinal and bending vibrations of the transducer are composing and formed elliptical trajectory vibrations on the two end tips of the horns. The runners are in contact with the end tips of the horns, and the driving forces are the frictional forces between the runners and the driving tips. By using FEM method, the longitudinal and bending vibration modes are gained, and the corresponding resonant frequencies are tuned to realize the modal degeneration. At last, transient analysis is developed to gain the vibration trajectories of the driving tips, and elliptical motion trajectories are observed to be formed, which verify the feasibility of the proposed design.

Abstract: Based on the fairness and benefits of the opportunity to accept higher education, tuition should be paid. The average cost of higher education and the ability to pay tuition which is determined by the average income are two fundamental basics for making the standard of tuition. In order to research the standard of tuition, the paper has focused on two issues: What is the acceptable range of tuition for higher education in China How much is the reasonable tuition for higher education in China Then we have established a multiple linear regression model on the basis of the reasonable assumption. Using the Eviews Software, we got that the range of average tuition was [4674.4, 7516.1]. Then we made a sensitivity analysis on the state funding and got the conclusion, tuition of colleges and universities all over our country were reasonable, and that the average tuition was negatively correlated to the state funding to some extent. Through the conclusion, we obtained that the state funding accounted for 25% in training costs of students. When the state funding rose by 250 yuan, the average tuition would decrease by 238 yuan.

Abstract: Euclidean distance function based fuzzy clustering algorithms can only be used to detect spherical structural clusters. The purpose of this study is improved Fuzzy C-Means algorithm based on Mahalanobis distance to identify concept structure for Linear Algebra. In addition, Concept structure analysis (CSA) could provide individualized knowledge structure. CSA algorithm is the major methodology and it is based on fuzzy logic model of perception (FLMP) and interpretive structural modeling (ISM). CSA could display individualized knowledge structure and clearly represent hierarchies and linkage among concepts for each examinee. Each cluster of data can easily describe features of knowledge structures. The results show that there are five clusters and each cluster has its own cognitive characteristics. In this study, the author provide the empirical data for concepts of linear algebra from university students. To sum up, the methodology can improve knowledge management in classroom more feasible. Finally, the result shows that Algorithm based on Mahalanobis distance has better performance than Fuzzy C-Means algorithm.

Abstract: In order to improve the precision and efficiency of IC packaging for wafer wire bonding equipment, a new 2-DOF positioning table of high speed and accuracy, directly driven by voice coil actuator, is put forward. By establishing dynamic model of VCA and positioning table, the electromechanical coupling control system based on minimum deadbeat response controlling algorithm is proposed. The prototype experiment shows that the new 2-DOF positioning table is robust and of good dynamic performance.

Abstract: Diamond film coated hard metal cutting tools are indispensible for high efficiency machining of materials which are difficult to cut by ordinary tools, and are successfully used in the dry cutting of high silicon content Al-Si cast alloys, graphite, carbon reinforced composite (CRFC) and metal matrix composite (MMC) , ceramics, and many other materials. In the present presentation, a novel process of High Current Extended DC Arc (HCEDCA) plasma CVD for mass production of diamond film coated hard metal cutting tools is presented. Besides, a novel process for the pretreatment of the hard metal cutting tool substrate, which involves the idea of “surface engineering” consisting of boronizing and alkaline and acidic etching is also discussed, by which the adhesion of the diamond film coating to the hard metal substrate can be greatly enhanced. Highly adherent and uniform diamond film coatings are successfully obtained. Diamond film coated WC-6wt%Co indexable tool bits, drills, endmill samples have been produced and been shown having excellent cutting performance by field cutting tests in dry cutting of Al-12%Si cast alloy and Al-15% SiC MMC materials.

Abstract: This paper focus on single vehicle scheduling problem minimizing the line-side inventory of mixed-model assembly lines, considering the assembly sequence as an input.An exact algorithm is proposed based on three newly introduced concepts: conflicting, tight subset and complete conflicting subset, which divide the transportation operations into three classes.The solution generated by the algorithm is proved to be optimal. The algorithm is compared with the most popular FCFS (first-come, first-served) rule, and results shows the advantages of the algorithm, especially for large instances of the problem.

Abstract: By means of mechanical properties test， the relationship among particle size，electric field，magnetic field ,electromagnetic field and shear ratio on the Ni/TiO₂/Urea core-shell particles electrorheological fluid properties analyses. It is found that with increasing particle size， the property of electrorheological fluid decreased, and with increasing shear ratio the property of electrorheological fluid increased for same composition ER. At same time, the smaller of particle size, the higher of ER properties, but there is a critical value for shear ratio, the properties of ER is near value for same composition ER fluid. In magnetic field, the properties of ER showed a contrary result, the smaller of particle size, the lower of ER properties，and electromagnetic field make the properties increase.

Abstract: Based on TEOS system and sol-gel process together with catalysts and organic polymer, the microstructure of SiO₂ film is controlled. The films are characterized by ellipsometer and SEM respectively. The experimental results show an antireflective film produced by incorporation of organic polymer in the precursor solution is a more effective method of effect the uniformly porous structures of SiO₂ thin film on the glass substrate.

Abstract: This paper investigates the accuracy evaluative factors of 5-axis turbo molecular pump rotor machining center.Using rigid body kinematics techniques and homogenous transformation matrices, the systemic geometric volumetric error model are established for error synthesis. Novel volumetric accuracy model can be verified effectiveness better estimation of machine performance, by means of physical simulation and measurement. The effect of the individual axis geometric errors can become increasingly significant as the chain of dependent axis is extended. The effect of the rotary axis and their errors cannot be ignored. Calculating volumetric accuracy as the maximum difference between the error vector at any two positions can be computationally intensive.

Abstract: Since its establishment, Henan Institute of Engineering (HNIE) has not systemically given integral image designing. With the advent of the Information Age, the institute urgently needs to provide the integral visual vision, Based on the existing logo of HNIE, we design Visual Identity System including fundamental part and applied part, so as to integrate and unify the image of the institute.