Applied Mechanics and Materials Vols. 365-366

Abstract: This paper is concerned with the crashworthiness design of the front rail on a vehicle chassis frame structure considering uncertain crash directions. The front rail, as a typical thin-walled structure, is sensitive to the loading direction for crashworthiness requirements. Multi-step multi-domain optimization method was applied to obtain a new single-layered front rail (SFR) which has better adaptability to crash loading directions. To further improve the front rail crashworthiness, a two-layered front rail (TFR) is proposed. Response surface method is conducted to pursue the optimal thickness pair of the two-layered front rail. Numerical simulations are carried out with Altair/Hypermesh and LS-DYNA to compare the crashworthiness performances of the standard rectangle front rail, SFR and TFR. The results show that TFR keeps the same adaptability of loading directions as SFR meanwhile it can absorb more crash energy during front angle impacts.

Abstract: As the reason for large transmission ratio, small center distance and interference on translational motor body, the design method of involute gear for translational meshing motor was proposed. In order to get appropriate tooth profile parameters, the trail calculation considering the conditions of interference and coincidence degree were applied using the tooth profile parameters calculated from given module, number of teeth, pressure angle and modification coefficient. The internal meshing gears was designed and processed based on proposed method. The novel translational meshing motor using designed involute gears operates successfully and efficiently which testify the validity and feasibility of proposed method.

Abstract: Collimators are used in radiosurgery or radiotherapy systems to accurately focus their high-energy rays on the target to avoid causing damage to the collateral healthy tissues. With the development of conformal radiotherapy techniques, variable visual field collimators (VVFC) are widely used and many designs of VVFC have been proposed. However, these designs still exhibit different deficiencies, e.g. unable to completely eliminate the radiation leakage due to the inter-block gaps. Therefore, in this paper, an innovative design of VVFC is proposed through analyzing the original VVFC, determining the conflicts and solving them using the inventive problem solving methods (TRIZ). Compared with the existing designs of VVFC, the proposed design enables the selection of suitable size of field for the treatment of different size of targets, and completely eliminates the radiation leakage due to inter-block gaps.

Abstract: Based on an superposition principle, a new type of mechanically driven non-sinusoidal oscillation device has been designed. It has been proved by production practice that the device has much more advantages of investment, operation, maintenance and reliability than hydraulic-servo driven system. Now the oscillation device has been used at CC slab caster at No.1 Steel-making Plant of Shougang Corp. and obvious effect has been obtained.

Abstract: Taking into account the uncertainty in material property and component quality, a complex mechanical component such as a gear should be treated as a series system instead of a component when evaluating its reliability, since there exist many sites of equal likelihood to fail. Besides, conventional system reliability model is not applicable to such a system because of the statistical dependence among the failures of the every element (damage site). The present paper presents a model to estimate complex mechanical component reliability by incorporating order statistic of element strength into load-strength interference analysis, which can deal with multiple failure mechanisms, reflect statistical dependence among element failure events and that among different failure modes.

Abstract: Biomass is a kind of important renewable energy resource, while the solidification technology provides an effective way for its energy utilization. The current feeding device of the biomass briquetting machine in China is manual or semi-automated, with low production efficiency. A new kind of automatic feeding device has been designed to meet the continuous feed requirements of a production line with the production capacity of 10~12 T/h in this paper. The shaftless screw device can realize continuous material supply, and the batch hopper provide materials for different briquetting machine, at the same time the crank-rocker mechanism provides certain vibration to prevent material clogging. This device gives a uniform material supply with a high degree of automation, which can improve the biomass fuel production effectively proved by practice.

Abstract: The high-speed spinning bell electrostatic automatic machine is the key equipment of the automotive coating line. A simplified mathematical model of the process of spraying aggradation was proposed by analyzing the working principle of electrostatic spray. Furthermore, the relationships among spraying distance, spraying speed and number of spraying pattern overlap were investigated and revealed. And the expressions for the velocities of both side spraying machine and top spraying machine are derived. This work provides an important theoretical basis for the spraying trajectory planning .

Abstract: The weight of platens accounts for about 70% of the entire clamping device of injection molding machine. The reduction in the weight of platen means the reduction in the cost of injection molding machine. UG NX8.0 was adopted to conduct the parametric design, and UG NX8.0 Advanced Simulation module was adopted to conduct the finite element analysis and the topology optimization design for the front platen of injection molding machine so as to obtain the quantitative conclusions that the volume of platen is reduced and the stiffness as well as the strength is improved. The maximum deformation of platen is decreased by 6.2%, the volume is decreased by 6%, the maximum stress is decreased by 6.6% and the average displacement of all the nodes in the mold mounting plane is decreased by 9.1%. The effect of optimization is obvious.

Abstract: In this paper, we use chaos theory to explain the phenomenon in the field of fashion design. First we do a comparative analysis between nonlinear and garment industry trends of chaos theory, and then discuss the effect of Butterfly Effect to the product positioning of clothing brand, study the relationship of the fractal theory between the integrity and locality of the garment industry brand design. Finally, make examples of the wide range of applications of chaos theory in the field of artistic form design. This paper introduces chaos theory into the field of garment industry and design, which will bring far-reaching influence to the development of the garment industry and the future design.