Advanced Materials Research Vols. 479-481

Abstract: Based on a “1st generation” compliant foil journal bearing, the performance of foil bearing was simulated according to the model base on Reynolds equation coupled the finite element method. Model considers the bending of top foil, elastic deformation of bump foil, the friction between top foil and bump foil and the interaction between bumps. After compared analysis results to test data, the result of simulation was more accurate than other models, thus this model establish a basis for further study of the compliant foil bearing.

Abstract: A ship general design platform is established in order to satisfy the requirement integrating design, analysis and optimization in ship design process. A design-analysis unified connected model is developed based on digital ship idea and a ship general design platform frame system is formed based on the template technology. In the preliminary application process, a design tool database and an applicative template database are established. That the reliability proves to be good is significant for promoting traditional design method and improving design efficiency.

Abstract: The wheel-legged rover with a double-half-revolution mechanism uses two tandem planetary gear trains to drive. Its virtual prototype model was built in COSMOS Motion software, and the mechanical data of each gears of the wheel-legged rover were obtained by dynamic simulation under the typical working conditions. On this basis, the finite element analysis model of the wheel-leg planetary gear was established and its stress analysis was done. The discrete optimization mathematical model was built with the optimization target of minimizing the rover’s wheel-leg planetary gear volume and the constraint condition of keeping the Mises stress applied on the dedendum under the admissible Mises stress. Based on ANSYS Parametric Design Language (APDL), the optimization design was done for the above gear based on discrete optimization method. The result shows that the optimized gear not only meets the strength requirement, but also its weight is 58% lower than the original, which will provide a new effective method for optimizing the wheel-leg structure of the rover.

Abstract: Micro-pile of slope reinforcement type is more and more used in slope engineering, at the present stage most of the projects are designed by engineer experiences, theory researches are hysteretic, load transfer and mechanics characters are not clear. Combining with Heshun highway Slope treatment project, this micro-pile structure are analyzed with finite element method (FEM) under different conditions like different anchorage depths, pile diameters and displacements on the pile roof. Under these conditions the strain and stress are calculated, the results shows that: there is an optimal anchorage depth, under this depth the concrete can produce the best properties and save funds; increase the diameter will improve bearing capacity observably; the displacement of pile roof can also can be decreased if increase the modulus of elasticity.

Abstract: The design of H.264/AVC interpolation unit is very challenging for the high memory bandwidth and large calculation complexity caused by the new coding features of variable block size (VBS) and 6-tap filter. In this paper, a novel one-step interpolation implementation algorithm is proposed which can effectively reduce processing cycle because of its less memory accessing. Moreover, a data reuse scheme is used to save processing cycle and memory bandwidth. A high performance hardware architecture is implemented according to the methods mentioned above. As a result, 26% memory bandwidth reduction and 45% processing cycle reduction are achieved, which shows that our architecture is an efficient hardware accelerating solution and can be used in real-time encoder.

Abstract: Atmospheric visibility is close to the transportation safety. In order to get accurate atmospheric visibility, according to atmosphere backscattering theory, a novel visibility measurement system is designed. The system adopts many modular devices such as semiconductor laser, silicon avalanche photodiode detector, multi channel photon counting card, embedded computer and so on. Where embedded computer is the core of the system, to realize system timing control, visibility inversion and information display. Finally, the objective and convenient measurement of atmospheric horizontal visibility and slant visibility are achieved. Outfield comparison experiments show that in low visibility weather conditions, the system obtains high measurement accuracy, which has high practical value and wonderful development prospect.

Abstract: This paper mainly focuses on the numerical simulation of flow velocity aiming to obtain the velocity distribution of flow in the cyclone. The authors took advantage of RSM turbulence model of software FLUENT to calculate the velocity distribution. Relationship between particles separation and double-layer rotating flow can be obtained based on the simulation results, which can also provide basis for the improvement of structure design and separation performance.

Abstract: For the beveloid gears with intersecting axis and crossed axis coexisted in the marine gearbox with small down angle, contact analysis of the meshing gear pair taken the assembly error into consideration is proposed based on the nonlinear finite element analysis software Abaqus. Considering the central distance error, axial position error and the angle error, the FE model of beveloid gear pair with intersecting axis and crossed axis were established, respectively, and the tooth contact stress, the maximum influence factor and transmission error were calculated. The effects of these errors, the central distance error, axial position error and the angle error on the contact characteristic were discussed.

Abstract: This study conducts simulation analysis of collision processes between a ship and a pier with the finite element software ABAQUS. It aims to compare peak values of impact forces, stresses and strains of the anti-collision device, and energy changes of the system when with or without the bridge pier protection buffer, so as to verify the device’s role in buffering impact and greatly improving the pier’s resistance to impact.

Abstract: Heat generation and heat transfer of motorized spindle unit are studied in this paper, including heat generation of built-in motor and rolling bearings, heat conduction, convection and radiation between spindle components. By modeling a FEM model of a high performance motorized grinding spindle, thermal characteristics simulation of the spindle unit is completed. The thermal characteristics under different spindle speeds, different cooling water flow rates and different forced air flow rates are simulated. The numerical results show that spindle speed and cooling water flow rate have significant influences on thermal characteristics of motorized spindle unit. These results are useful to guide the design and verification of motorized spindle unit.