Applied Mechanics and Materials Vols. 543-547

Abstract: 3D printing is a new technology of computer science, is an important topic in the field of academic discussion, is still in the primary stage of 3D printing technology in China, the application is not widespread, so scholars have discussed a lot of work to do. This paper introduces the 3D printing technology international and domestic development situation, the working principle, the printing process and technology, proposed the application bottleneck 3D printing technology is to manufacture, printing materials therefore, electroactive materials developed for 3D printing will become an important direction of future research of 3D print.

Abstract: In order to study the cooling performance of cooling system of some subcompact, this article used GT-SUITE to build a one-dimensional model for it. Then the main factors for cooling performance were analyzed by the model, and some improvement measures were put forward after finding problems in the cooling system. The experiment data shows that the cooling performance has been significantly improved. At the same time, this research gives important technical parameters for the design and matching analysis of cooling system.

Abstract: With globoidal indexing cam mechanism as the object of study, this paper introduces its operating principle, analyzes and calculates its main motion parameters. On the basis of theoretical study, the paper using structured program design method and Visual Basic 6.0 as developing tool analyzes main function modules, such as system parameters input, law of motion, kinematics analysis and pressure angle check, etc. The paper develops globoidal indexing cam mechanism CAD system in simple operation and describes application method of the system and design examples.

Abstract: Machine with a parallel jaw as a fixture of a widely used, it is an indispensable tool in the machining of the existing. But the actual processing according to the workpiece size, pad iron with different specifications in the clamping to adjust the height of the processed parts. The height adjustable machine with a parallel jaw improves caused problems and the use of existing in the actual processing is organic with parallel jaw of inconvenience, in order to solve this problem to design a highly available parallel jaw adjustable machine of the utility model patent, can improve the productivity and reliability, so that the operation all great satisfaction. height adjustable device of the machine with parallel jaw are discussed.

Abstract: This paper designed an impact testing machine to observe the movement characteristics of particles. We simulated the rotor with different blanking frequency and different rotating speed by EDEM to explore the acceleration of the rotor. Through simulation, blanking frequency could have an impact on the rotor acceleration of testing machine, and the greater Blanking frequency was, the more obvious hanging material phenomenon was. Increasing the diameter of feed inlet could ease the phenomenon of hanging material, but would decrease particles speed. Therefore, we should not only avoid the phenomenon of hanging material, but also make the particles get high speed when designing the impact testing machine.

Abstract: To reduce the cavitation occurring on valve plate of typical Swashplate piston pump, an optimization design method was introduced to quantitively analyse the accurate relationship between structural jet grooves parameters and cavitation.Using the CFD method, the sunking and discharging process in piston pump was simulated dynamically.The damp grooves structure effect on both jet angle and pressure shock were analysed visually with a series of different parametrical grooves.By establishing parametrical damp groove model, the piston pumps dynamic analysis was integrated with the technologies of CFD analysis, experimental design and approximation model, etc.The mathematical model of plunger pressure in oil back period, jet angle and structural parameters of damp groove were established in the form of second-order RSM model. The damp groove structure of valve plate was optimized on the basis of the RSM model.Test data show that the anti-cavitation performance of optimized valve plate was increased obviouslyAnd this method provided theoretical foundation for the structure design of damp groove.

Abstract: The simulations of a low-speed axial compressor rotor with two tip clearance sizes, 0.5% chord and 1.5% chord, were performed in the study. Overall performance and detailed flow fields at near stall condition are analyzed. The results show that the rotor stall occurs at higher mass flow condition with large tip clearance. For the small tip clearance the tip leakage vortex and the corner vortex both contribute significantly to the rotor stall, and the interaction between the vortices promotes the stall generation. While for the large tip clearance the tip leakage vortex plays a primary role, and the vortices interaction is ignorable.

Abstract: Mechanical pressing is one of the most widely used methods of separating oil from oil plants. Screw press is a typical oil extraction equipment adopting this method. In which the pressing chamber is a core component, and the press cage, as a main part of it, whose strength is a precondition to ensure normal operation of the screw press. Comparing with the complexity and drawbacks of traditional analyzing and checking methods, here, computer aided analysis was used to make stress analysis. A simplified 3-D model of the press cage was built, and the finite analysis was conducted by ANSYS software. Then, the continuous deformation and stress distribution of the cage were obtained. The results can provide a good reference to the improvement and optimization of its structure design

Abstract: This paper studied the original rubber suspensions, which found that the original rubber suspension has high transfer ratio, not conducive to energy attenuation. In view of this situation, redesigned of the new rubber suspension, the new rubber suspension was studied by 3D numerical analysis, the results show, the new suspension on the structure and mechanical properties can meet the needs of the engine. The new suspension and the original suspension are doing the contrast test, the results show, the new suspension has the low transmission rate, and transmission rate increases with the speed change relatively flat, which to improve the comfort of the car.

Abstract: ACL damage is one the most frequent causes of knee injuries and thus has long been the focus of research in biomechanics and sports medicine. Due to the anisometric geometry and functional complexity of the ACL in the knee joint, it is usually difficult to experimentally study the biomechanics of ACLs. Anatomically ACL geometry was obtained from both MR images and anatomical observations. The optimal material parameters of the ACL were obtained by using an optimization-based material identification method that minimized the differences between experimental results from ACL specimens and FE simulations. The optimal FE model simulated biomechanical responses of the ACL during complex combined injury-causing knee movements, it predicted stress concentrations on the top and middle side of the posterolateral (PL) bundles. This model was further validated by a clinical case of ACL injury diagnosed by MRI and arthroscope, it demonstrated that the locations of rupture in the patients knee corresponded to those where the stresses and moments were predicted to be concentrated. The result implies that varus rotation played a contributing but secondary role in injury under combined movements, the ACL elevation angle, is positive correlated with the tensional loading tolerance of the ACL.