Advanced Materials Research Vols. 328-330

Abstract: A communication and data collection device was designed based on GPIB protocol, with the design of PC control and automatic measurement software, which can complete programmable electronic load control and ambient temperature data acquision, implementation of new energy vehicles for the automatic measurement of battery pack and Data records, simplifying test system design. The results show that the system operation and reliable performance, advanced features, can realize the new energy vehicle power battery pack automated testing of complex working conditions.

Abstract: Based on the instance of collection the data of complex surface impeller and reconstruction the three-dimensional model, it describes the concepts and basic principles of Reverse Engineering, and discusses the entire process in detail, which are from the data of impeller collected, the impeller three-dimensional model re-Construction, fixture design to NC simulation machining. Solved the design and manufacturing problems of complex surface parts, which can not be solved by the conventional methods.

Abstract: To further understand the bearing performance’s influence of the plastic deformation after balls and bearing rings surface multiple collision in ball bearing’s strengthening and polishing processing by the strengthening and polishing machine. ABAQUES software is used for finite element analysis in the three-dimensional modeling of multiple collision, and the plastic strengthen the performance of bearings is researched mainly. The results shows that the raceway surface is significant plastic strengthen in multiple collisions, Yield ability is enhanced largely, and surface residual stress state present for the compressive stress. Raceway surface strengthening process requires a particular number of times to ensure the processing, with strengthening processing times increasing, bearing raceway surface strength is saturated, then, the number continued to increase to strengthen, the surface strength is no significant increase. But after the collision of ball, uniform residual compressive stress is forming in the bearing surface, good for improving the fatigue strength and bearing life.

Abstract: The structure and working principle of a new translational piston compressor was introduced in this paper. Its piston works in a way of translational motion, hence reduces the piston’s relative velocity to cylinder and cap, as well as friction and wear. In order to avoid vane detaching from piston, simulations were carried out regarding the pre-tightening spring and an optimal preload of the spring was obtained. By analyzed and compared to conventional rolling piston compressor in term of contact force between vane and piston, it was pointed out that the new compressor possessed advantage of kinetic characteristic and is more suitable for the situation of high rotary speed.

Abstract: A new type of variable structure motorcycle helmet is proposed in this paper, in which that the helmet’s chin-guard can be transformed between the full-helmet status and the half-helmet status as needed. The helmet creatively adopts double movement nails and double track grooves to constraint the chin-guard movement according to the predetermined trajectory, and thus smoothly accomplishing the chin-guard’s lifting, climbing, passing zenith, falling and closing in the helmet shell. The paper introduces the chin-guard’s trajectory planning principles, realizing methods and designing steps, and then gives a design case for the constraint slot tracks in detail. The results show that the new type helmet can reliably realize helmet structure conversion between full-helmet and half-helmet and fully meets the design requirements.

Abstract: Finite element software ANSYS was used to study the influence of welding sequences on the distortion generated in the welding process of a Q345 plate with V-groove. The simulation of the welding process consists of sequentially coupled thermal and structural analyses using element birth and death technique. The results show that the backstep welding makes the distortion decrease. But back welding with too many steps makes the distortion increase. For a structure, the most reasonable number of steps can be found.

Abstract: To quantitatively analyze the design process of vehicle R&D, and provide the basis for process optimization of research and development design, thus shortening the development cycle of new cars and enhancing the competitiveness of car business. Firstly this paper analyzes the core business of vehicle R&D design, and then apply the theory of Petri nets to build Petri model of vehicle R&D design process, finally apply simulation software to simulate the Petri model, and analyze the key constraints point of the R&D design process, point out the improvement direction of vehicle R&D process.

Abstract: The non-ball mill is a new-type grinding equipment that is developed on the foundation of the successful technology of vertical shaft breaker, vertical mill, roller etc., its principle is to make the movement route of attacking the supply in the machine to be redesigned , the grain reaches to break once only through constantly accumulating energy in the grain, the crushing ratio is big, especially this machine adopt the advanced technology, the vulnerable part is made of metal and nonmetal, which make the life-span lengthens ten times than the alloy hammer’s, which is invention in the world . The average size of this machine is smaller than 1 mm, it is not only suitable for soft quality supplies but also further more superior for hard quality supplies performance.

Abstract: Plated PE plastic steel pipe has characteristics of high strength, light weight and strong resistance of corrosion and it is very suitable for construction of grape rain shed. The wind pressure distribution of multi-span grape rain shed frame is simulated by CFD software, and the structure of multi-span grape rain shed is optimized in this paper. The force structure of pre-optimal and post-optimal multi-span grape rain shed is analyzed by GSCAD. The study shows that the plated PE plastic steel pipe is suitable for grape rain shed, and the post-optimal multi-span grape has good performance.

Abstract: In this papers, the authors described a rapid prototyping method to produce vascularized tissue such liver scaffold for tissue engineering applications. A scaffold with interconnected channel was designed using CAD environment. The data were transferred to a Polyjet 3D Printing machine (Eden 250, Object, Israel) to generate the models. Based on the 3D Printing model, a PDMS (polydimethyl-silicone) mould was created which can be used to cast the biodegradable poly (L-lactic-co-glycolic acid) (PLGA )material. The advantages and limitations of Rapid Prototyping (RP) techniques as well as the future direction of RP development in tissue engineering scaffold fabrication were reviewed.