Advanced Materials Research Vols. 228-229

Abstract: Remanufacturing engines don’t pass the test without running-in process. And most of them never so much as reaching 85% of the standard index. After a careful analysis, it is believed that mainly be caused by being lake of enough running-in process. Then a cycle running-in criterion with low data is designed to verify the speculation, and it even don’t reach 50% of full load level. The results show that remanufacturing engines show a good performance, and they can also reach qualified index. Then, based on the variation of dynamic performance of remanufacturing engines, more engine tests have been done to optimize the running-in criterion. After that, a new running-in criterion established which improves efficiency. Moreover, it is proved effective, too.

Abstract: Structure noise of marine gearbox seriously affects warship’s concealment, stability of transmission system and amenity of crew working environment. There are many ways to control structural vibration. To add damping in reduction gear box is an effective measurement to suppress box resonance. The key to design damping structure is to determine the parameters of the structure. In most instances, the structural parameters depend on experience and many experiments, which is lengthy and expensive. This paper made an analysis at design stage of reduction gear product by finite element method. This can determine the parameters of box structure, and reduce the input effectively. This method has important theoretical value and application prospect.

Abstract: Due to the establishment of thermal equilibrium is very rare, some cases not possible, so the accuracy of temperature measurement is often difficult to ensure that no one will be allowed or asking for too much more to the transient temperature measurement is difficult. Based on the finite element software ANSYS platform, according to the feature of fusion welding, the impact of heat on the welding and the welding temperature field is simulatd by the Three-Dimensional Dynamic FEM simulation of the ANSYS software. Finite element numerical simulation results with the test weld shape with good consistency, so that the body welding Gauss heat source model is used to simulate the temperature field is reasonable.

Abstract: A systematic methodology is presented for design of 2R2T 4-DoF symmetrical parallel manipulators, based on the screw theory. Through analyse the given constraints of the moving platform, using the screw theory and the reciprocal screw theory. According to the reciprocal product between kinetic screw and constraint screw in screw theory, this method firstly creates possible limb structures and then generates different models of mechanism. enumerate the limb twist system. Based on the limb twist system, design the feasible limb structures and the potentially parallel manipulators.

Abstract: The research was conducted to evaluate pavement properties of polyacrylonitrile fiber asphalt binder and asphalt mixtures, including high temperature stability of binder and mixture, low temperature crack resistance and water stability of mixture. Moreover, polyacrylonitrile fibers were compared with methyl cellulose in the asphalt binder and asphalt mixtures. The result indicates that polyacrylonitrile fibers may improve clearly the high temperature stability of asphalt binder, and pavement performance of mixtures is enhanced obviously. Also polyacrylonitrile fiber binder and mixtures have better performance than methyl cellulose.

Abstract: Concerning on the current vague definition of industrial design in China, this paper indicates that industrial design and engine design are compound concept. In the first place, it introduces the definition and theory of industrial design. Then, by analyzing design development and industry development relationship, it regards modern industrial design as a heritage and a production from the development of traditional handcraft design. Finally, it proposes that in order to regulate a modern design theory with Chinese characteristics. We must learn the advanced industrial design theory from the west. At the same time, we must fully excavate the essence of traditional Chinese handicraft culture. Also we should integrate Chinese traditional handicraft design theory into the west modern industrial design theory.

Abstract: A new type of water-based lubrication additive — colloidal polystyrene-carbon nanotubes (PSt-CNTs) has been prepared. Transmission electron microscope shows that the PSt-CNT colloids are tubes with tiny balls in nanometer scale. Four-ball test results indicate that both the load-carrying capacity and anti-wear of the colloidal PSt-CNTs are much superior to those colloidal PSt owing to the additive reinforced by CNTs. The optimum colloidal PSt-CNT content is 1.0 wt.%. The worn surfaces were analyzed using scanning electron microscope. Finally its lubrication mechanism was speculated preliminarily.

Abstract: By contrasting the two finite models, a practical finite element computational model of X-cor sandwich’s compressive modulus was proposed. Through numerical analysis the X-cor sandwich’s stress field and compressive modulus were achieved and the effects of changing Z-pin’s radius, density, angle and volume fraction to the X-cor sandwich’s compressive modulus were analyzed. The numerical analysis results indicate that as the Z-pin’s angle increases the X-cor sandwich’s compressive modulus decreases, as the Z-pin’s radius, density and volume fraction increase the X-cor sandwich’s compressive modulus increases. Through the computation of finite model the influencing trends of X-cor sandwich’s parameters are achieved and the rationality of the proposed finite model is verified.

Abstract: The paper connects trajectory model with the man-machine interface of MFC, which can make the flight parameters and trajectory-drawing together in real-time, being the favorable interaction platform of trajectory design. Through the integrated platform users can obtain a series of flight parameters, such as flight time, velocity, location, impact angle and so on. So we can obtain the changing rule of parameters directly, which can be the basic elements for feasibility and optimization of the whole trajectory design. The platform has modular programming language, and every module has independent function, which can be called by other software independently. With standard structure definition, input/output interfaces meet the function of communication. And the platform has some interface for the secondary development.

Abstract: Based on electromagnetic and temperature field models of nonlinear ferromagnetic materials, this paper conducts a finite element analysis of the induction heating process of PC steel bar, thus obtaining the change curves of temperature, active power, heating efficiency and power density. The main factors and mechanisms affecting the heating efficiency and the temperature uniformity are analyzed systematically by a combination of the simulation result and the experimental fact. This work is expected to contribute significantly for optimizing the key parameters of induction heating production of PC steel bar.