Advanced Materials Research Vols. 503-504

Abstract: In order to analyzing the dynamic characteristics of the machine bed totally and grasping the dynamic parameters accurately, I make the use of conventional method to design fine-long rods machine firstly and research with FED dynamic property that machine in the processing . I use the FED method to find the region of defect and build the method of optimization. Dynamic property of Rib has affect bed of machine directly. The thesis would change and optimize rib. At the same time, they act as target of optimization and improve the dynamic property of bed with FED and achieve it. The thesis has offer evident of theory for changing bed.

Abstract: In order to research the relationship between drawing panels and sheet properties, some parts with typical deformation feature （shallow drawing, deep drawing and bulging-deep drawing）are chosen as analysis objects. Then, finite element method is used to establish the model that can describe the quantitative relation between blank performances and forming safety margin of drawing panel. With the model, the law that illustrates the influence of sheet properties on the deformation procedure of drawing panels is get, and the criterion for selection of panel material is provided for production.

Abstract: The binary row short-pitch transmission based precision roller chain highlights its radial flexibility and circumferential rigidity, it constructs a new type of harmonic transmission unit by replacing the tradition flexible wheel. Driven by a generator of mechanical harmonic wave the rollers of the binary row roller chain mesh with the teeth contour of the two inner gears which realizes reduction in small teeth difference and zero-tooth-difference synchronous output. The rotation components distribute uniformly on a plane. In theory, it is capable to eliminate dynamic imbalance factors. This paper detailed the principle of the harmonic drive meshing and gave out the design approach to control parameters of trough in the roller chain. Through the prototype testing, it confirmed the feasibility of this transmission mode.

Abstract: A charged air cooler (CAC) with good thermal-hydraulic performances is the guarantee for vehicular turbo charged air system. Mullti-porus media model is adopted in this study to investigate the thermal-hydraulic performance of a CAC and the effect of its structure on the performance. The detailed fin structure can be simplified and thus computational workload can be reduced greatly by this way, and the overall thermal-hydraulic performance investigation of a CAC is possible. The study results show that the inlet and outlet locations of hot-channel have a significant effect on thermal-hydraulic performance and through changing the locations, heat transfer can be enhanced and flow resistance can be reduced.

Abstract: In order to evaluate the contact strength of a type of high-speed train traction motor rotor，in this paper, for the high speed test train traction motor under the five working conditions, Based on the established motor rotor 3D model, NX.Nastran environment, the contact pressure between rotor and lamination is analyzed by the finite element and got the stress intensity distribution on the rotor. The five working condition include starting, constant work starting condition, rated, short circuit condition, the highest speed condition. The result shows that for the high speed tractor motor, in the starting conditions, and won't appear rotor shaft and laminated relation between slip. The finite element method is useful to do the contact strength analysis, and thus to improve the design efficiency, increase the reliability of the product, and lay the foundation for the latter design optimization.

Abstract: The comparative analysis of a parabolic and hyperbolic flexible hinges were presented. The closed-form compliance equations in the working and non-working plane can be derived by using the Castigliano’s second theorem. In order to compare the relative performance of parabolic and hyperbolic flexure hinges, a ratio function between specific compliances of the two hinges is defined. We analyzed the non-dimensional ratios of working plane and non-working plane compliance to show the relative properties of parabolic versus hyperbolic flexure hinges. The analysis results has showed compared to a hyperbolic flexure, a parabolic flexure can produce more desired output and is slightly less sensitive to axial effects under identical loading conditions. Meanwhile, the comparative study on the parabolic and hyperbolic flexure hinges can provide a theoretical basis for choosing them.

Abstract: The instability of the testing equipment protective shell is one of the importance issues in the design of testing equipment. In order to analyze the protective shell to external shocks instability problem, the shell instability of empirical formula was used to calculate the critical buckling load and the linear buckling was analysed to compare the simulation results with theoretical values and the error in control range by using finite element method.The calculations show that the finite element method for buckling analysis to provide guidance for the design is feasible.

Abstract: The application of electroative polymer devices requires the availability of their propertis at various operating conditions. Cellulose based Electro-Active Paper (EAPap) has been studied as an attractive EAP material for artificial muscles due to its low cost, availability, light weight, large displacement output, low actuation voltage and low power consumption. It is investigated which the underlying mechanism is responsible for their strain-field response. The understanding of the actuation mechanism of this material is important in order to improve the performance and also to better target the application. To physically investigate the actuation mechanism of EAPap, several tests are performed. TSC current showed an evidence of ionic migration effect. Thus, we conclude ionic migration effect associated with dipole moment of cellulose paper ingredients. These effects maybe depend on environmental condition.

Abstract: In order to reduce the cost of wind tunnel construction, simplify the requirement of control, and increase the security in the operation of nozzle, the multi-jack single-drive semi-flexible nozzle is designed. Based on the planar linkage design theory, the movement of multi-jack semi-flexible nozzle with single drive organ was achieved by using the software of MATLAB. Furthermore, the rigid-flexible coupling kinematics simulation of multi-jack single-drive semi-flexible nozzle is done to testify the rationality of the mechanism design by using the software of ADAMS and PATRAN/NASTRAN. The comparisons of four Mach numbers show that the simulation surfaces have good agreements with the aerodynamics surfaces.

Abstract: As the important device, self-loading device plays a key role in the side-crane used for container. And as the key component of the self-loading device, loading arm’s strength analysis is very important. FEA is introduced into the arm’s strength and rigidity analysis, and under the precondition of satisfying allowable stress, minimum weight of the arm is taken as the design target. Ulteriorly, by obtaining optimal geometric parameters, the loading arm’s optimization design can be realized and its manufacture cost can be reduced.