Applied Mechanics and Materials Vol. 643

Abstract: Diamond faceting is an important process of precious metal jewelry.Now it mainly rely on traditional processing methods to operate manual processing, but the pattern processed by manual is poor quality, consistency, and it also requires workers to have higher operating techniques and experience. What’s more, after long continuous work, workers’ body will cause some damage. This article develops a five-axis CNC diamond faceting machine based on Solidworks platform, introduces the design of each axis of the machine and describes the research of the tool path algorithm on the surface of jewelry and completes the parametric equations’ derivation of space curve in the surface of ellipsoid, finally use MATLAB GUI module to write the tool path generation software.

Abstract: To study the injury index to driver in front crash, this article uses the MADYMO software to establish the driver constraint system model which including car bodies, safety belts and 50% dummy for impact simulation. The simulation values are close to test ones after contrasted with the vehicle impact test. The influence of design parameters including the D-ring friction coefficient of seat belt, airbag strap and steering column on driver HIC, T3MS, THPC are researched by this model. The results show that: The smaller D-ring friction and a longer airbag strap length and steering column crushing can effectively improve the driver safety.

Abstract: A novel intermittent mechanism and low-impact deployment hinge based on intermittent mechanism are presented in this paper. This application is contemplated to lower the impact dramatically at the end of hinge deployment. The overall deployment process is described and the maximum impact force and angular velocity are derived. The effect of the intermittent motion mechanism on free spring deployable hinges is evaluated by indexes of maximum angular velocity and impact force. Cases are simulated to verify the mechanism design, and results show that the maximum angular velocity and impact force can be decreased by more than 90%.

Abstract: Optimal robust design for multiple response problems is becoming more important for compliant mechanism. However, there are now still need effective methods for complex multiple response problems in the design process of compliant mechanism. In this paper, through the Response Surface Methodology (RSM), a novel optimal robust design method for the flexibility relationships of the 3-RRR compliant parallel micromotion platform along the X、Y direction and the rotation around the Z axis is proposed. Analysed the influence of different size parameters of flexible hinge to the compliant parallel micromotion platform different direction flexibility, the optimized complex multiple response variables of the compliant parallel micromotion platform and the best robust solutions are developed. And a real case study is used to demonstrate the implementation and potential applications of the proposed method for optimization design of compliant mechanism with considering complex multiple response problems.

Abstract: The performance of a hydrodynamic journal bearing with different center circumferential grooves (CGs) is investigated using Computational fluid dynamics (CFD) simulation. The influences of the CG extended angel have been investigated based on the numerical model. The results show that the CG of millimeter range depth in load zone is not good for the bearing performance but it is opposite in unload zone.

Abstract: The exhaust heat loss of the power plant boiler can account for more half of the boiler heat loss, exhaust gas temperature is 110~160 °Ccommonly, so the exhaust gas heat can be used to reduce the coal consumption, raise the economic benefits. Before and after the desulfurization tower of a 350 MW unit, there installs two plate heat exchangers, heating condensation water respectively, which can improve the thermal efficiency. With two heat exchangers working under the design conditions, a test was carried out based on a 350 WM unit simulation system in order to test the influence of system for unit operation characteristics. Referring to the data, the investment of the heat exchanger can achieve 2.68 g/kWh coal saving during the non-heating period and 0.2531 g/kWh during the heating period.

Abstract: The semeiology’s effect on the design of the product interface is labored according to the origin of the semeiology. This paper research on Industrial Design Materials with Effect of Symbol on Product Interface Design. From lots of points of view, which are including graph, character, sound, material, color and so on, the semeiology’s effect on the design of the product interface is stated in the article.

Abstract: Appropriate drinking water defluoridation technology is urgently needed in china, which has a wide fluoride-rich area. The adsorption defluoridation method in the industrial high fluoride wastewater treatment is generally considered to be efficient and economic. However, the practical application of the method is not ideal in obtaining drinking water defluoridation. Four representative adsorbents activated alumina, activated zeolite, hydroxyapatite and hydrous zirconium oxide have been tested in terms of defluoridation efficiency under natural high fluoride groundwater and compared to clarify existing problems of adsorption methods. Results show that pH significantly affected adsorption efficiency. The adsorbents have low adsorption capacity under natural high fluoride groundwater and can achieve good adsorption effect under acidic conditions. However, in adjusting the water to the appropriate pH range, the adsorption method loses its advantages of convenience and affordability. Therefore, any adsorbent should be tested with actual field waters before designing filed application systems. Further research is also warranted in evaluating the field performance and the economic acceptance of the proposed method.

Abstract: Grain refinement can greatly enhance the material mechanics, magnetism and other physical properties. Exploration of grain refinement methodology has been one of the hottest fields of material research. Among all the methods, deep supercooling technology is an effective way to refine the grains. In this paper, the grain refinement mechanism has been explored by deep supercooling and rapid solidification technique with introducing grain refined process of pure metal, binary uniform crystalline alloy and the binary eutectic alloy. Furthermore, peritectic grain refinement mechanism and rapid solidification technique have been discussed.

Abstract: Statistical analysis on the combustion characteristics of interior materials is made based on two tests of random sampling. The common problems of current interior decorating pieces are found and studied. This study has important implications for the analysis of the current situation of the quality of automotive interior Materials.