Applied Mechanics and Materials Vols. 34-35

Abstract: Some qualitative properties are discussed about the transverse vibration of nonhomogeneous rectangular membrane whose mass changes only along one direction. The oscillating property of nonhomogeneous rectangular membrane is presented. The distinct property of frequency spectrum and the distribution rule about the node line of modal function are also proved.

Abstract: For flexible manipulator, the analysis of the joint characteristics and the stability become very important for controller design. The boundary conditions of the flexible manipulator with noncollocated P controller and collocated P controller are developed in this paper. And the stability of the flexible manipulator is also discussed.

Abstract: Low-temperature cracking is a significant and costly problem for pavement on the orthotropic steel deck. As a popular material used on the steel deck pavement, the low-temperature performance of epoxy asphalt mixture was investigated. In this research, the three-point bending test, the thermal stress restrained specimen test (TSRST) and the coefficient of thermal contraction test were conducted to achieve the flexural strain energy, the fracture temperature, and the coefficient of thermal contraction respectively. Test results show that epoxy asphalt mixture performs excellently on low-temperature properties and has a prominent deformation compliance with the steel deck. Findings from the research indicate that epoxy asphalt mixture is an alternative material paved on the orthotropic steel deck due to its profound low-temperature performance.

Abstract: SBS modified asphalt is widely used in pavement engineering in China, since it has excellent performances both in high-temperature and low-temperature stability. However, there is no effective method to determinate the modifier in the SBS modified asphalt at home and abroad, causing that there is no efficient methold to manage and monitor the modified asphalt’s quality. This paper mainly introduces the method to determinate the modifier content in SBS modified asphalt qualitatively and quantitatively, using infrared spectroscopy technique.

Abstract: Fe2B is a kind of typical intermetallic compound, which has good corrosion resistance in molten zinc. However, the fatal intrinsic brittleness limits its further application in the Hot-Dip Galvanizing Industry. Therefore, it is worthwhile to improve the toughness of Fe2B phase. In this study, the fracture toughness property of Fe2B phase with and without micro-addition chromium is investigated. In comparison with pure Fe2B phase, the intrinsic brittleness of Fe2B phase with chromium is lower. In addition, the valence electron structure of Fe2B containing various chromium content is calculated by the method of bond length difference (BLD). The results show that, in the (Fe1-x Crx)2B phase, the number of covalent electron pairs and the weaker bond energy are increased by the substituting atom-Cr. The calculated results are in good agreement with experimental observations.

Abstract: In this paper, a nonlinear model of pneumatic vibration isolator was established, considering the volumetric compressibility of air. Based on this, simulation analyses were done using matlab/simulink software. The response to two different types of disturbances is studied: single-frequency excitation and double-frequency excitation. Single-frequency excitation can induce harmonic frequency response and offset response at the zero frequency. When the frequency is near to the the linearized natural frequency, the harmonic frequency response become stronger. Nonlinear characters have much to do with the drive amplitude. When the drive amplitude become large, the nonlinear characters are more obvious. Double-frequency excitation can induce combination resonance. When the two drive frequencys are close, combination resonance are more strong.

Abstract: Surface texture, as one of the typical surface integrity characteristics, plays a vital part in efficiently and systematically evaluating the surface integrity and relevant mechanical properties of machined parts. Commonly used 2D surface roughness parameters are formularized and discussed in this paper. And 3D characterization technique is also illustrated through measuring and describing a machined surface with an optical profiling system. The relationship between surface texture and the fatigue property of final machined parts are discussed by employing the quantity of effective stress concentration factor which could be expressed by the standard surface roughness parameters and measured averaged root radius of surface texture’s valleys. This research emphasizes the indispensable role of the surface texture in evaluating surface integrity and corresponding functional performance of machined parts.

Abstract: As the market competition became more fiercely and the customers’ needs of diversified products increased, small and medium enterprises (SME) were more and more aware of the importance of getting quick respond of the market. More and more enterprises felt the logistics cost pressure during this business. How to lower down the logistics cost especially the stock cost became crucial for these SME enterprises. Further more, for enterprises whose producing type is many varieties small batches, how to use valid method to decline inventory and waste, is a great hard nut to crack. This article targeted on inventory control of clothing manufacturing enterprises for research, RFID technology was applied in stock management, optimization method was adopted for inventory control based on RFID, optimization control model was built, and the route for declined inventory cost and waste was analyzed. Finally, the application method was verified according emulation.

Abstract: Reverse engineering (RE) plays an important role in accelerating product research and borrowing ideals from other manufacturers. This paper describes the whole RE process from origin point acquisition to data processing for better point quality. Based on RE system of a toy prototype, a fine surface reconstruction module is developed. Measurement data are acquired by scanning the physical object using three-dimensional coordinate measuring machine (CMM) and an optical scanning device. After the establishment of the model, data process for prototype, includes noise elimination, data interpolation, data smoothing, data filtering, data splicing and surface reconstructing, are conducted subsequently. Through processing of measurement data, the authors succeed in creating a CAD model and fabrication of the product in stereo lithography apparatus (SLA) machine.

Abstract: In traditional interactive genetic algorithms, high-quality optimal solution is hard to be obtained due to small population size and limited evolutional generations. Aming at above problems, a parallel interactive genetic algorithm based on knowledge migration is proposed. During the evolution, the number of the populations is more than one. Evolution information can be exchanged between every two populations so as to guide themselves evolution. In order to realize the freedom communication, IP multicast is adopted as the transfer protocol to find out the similar users instead of traditional TCP/IP communication mode. Taken the fashion evolutionary design system as test platform, the results indicate that the IP multicast-based parallel interactive genetic algorithm has better population diversity. It also can alleviate user fatigue and speed up the convergence.