Advanced Materials Research Vol. 904

Abstract: Flared cuff for branched stent-graft application remains a longstanding challenge in endovascular graft exclusion. Introducing various kinds of function to describe the curved surface of flared cuff has shown significances. The method based on the energy loss formula of fluid mechanics is used to minimize energy dissipation of each model representing different functions. Among the five models that are created in experiment, the performance of arc model is relatively more excellent. The energy loss analysis has a certain guiding on morphology optimization of branched graft.

Abstract: With the increasing integration and complexity of microelectronic devices, fault isolation has been challenged. Photon Emission Microscopy (PEM) and Optical Beam Induced Resistance Change (OBIRCH) are effective tools for defect localization and fault characterization in failure analysis. In this paper, the principles and different application condition of PEM and OBIRCH are discussed. PEM is very helpful for locating defects emitting photon, but can not detect the defects which have no photon emitting, such as shorted metal interconnects; OBIRCH as a complementary, has a high success rate for locating resistance defects. Two cases with failure mechanisms illuminated are presented to show the different application of PEM and OBIRCH.

Abstract: This paper applies strain frequency response function (SFRF), presenting crack damage identification index based on change amplitude of SFRF. Crack propagation identification of four corners fixed thin plate experiment system based on fiber bragg grating sensors is established, experiments and analysis are carried out. Results show that: this crack damage identification system can identify crack damage occurs and propagation effectively.

Abstract: A MAS-based distributed intelligent pipeline leakage control model, ship pipe network through the intelligent valve control system for automatic, independent isolate damaged sections, thereby enhancing ship in wartime circumstances viability. According to distributed intelligent control pipe network model composed of properties, the Agent is divided into sensor Agent, processors and actuators Agent. Agent of the processor by the sensor data collected Agent independent judgment pipe segment status judgment method and control rules proposed intelligent valve leakage indicator to determine the logic of the other characteristic parameters for a comparative study. Pipeline leakage numerical simulation results show that: the model and control logic to isolate leakage pipe sections, using the model can improve the vitality of ship pipe network.

Abstract: Field test of particle impact drilling (PID) technology was firstly carried out in deep well and hard formation in Sichuan province china on Oct. 2013. The test formation was named Xu Jiahe, which was very difficult to penetration. Field test result shows that the ROP (rate of penetration) was nearly doubled by this technology. It indicates that there is a profound application prospect of particle impact drilling, especially for hard rock formation. In this paper, the equipment and working principle was analyzed. The experiment and simulation results showed that the rock breaking efficiency was highly increased by this technology. The details of this field test were presented too in this paper that proved the sound effect of PID.

Abstract: The time and flight diffraction (TOFD) technique has be more and more applied as a well-developed ultrasonic non-destructive testing (NDT) technique in a increasing number of industrial areas such as aeronautics and mechanical industries, therefore, the TOFD technique can be also used to investigate the sound field characteristic curve of artificial defects in welding. The investigations are performed in 2-layered medium (water-steel) with using the finite difference numerical simulation software Wave2000. The receiver group is consisted of several receivers which are immersed in water and have the same frequency, the receivers are placed at the opposite positions by changing regular angle.The results show that amplitude of diffraction wave change along different receiving orientation greatly, if the normal to the vertical direction is set to 0 degree, then the direction of 20° can receive the largest amplitude of diffraction wave. At last, the characteristic curve of diffraction wave is given in this paper.

Abstract: This paper discusses a robotic arm which is driven by servo device. Arduino hardware and program is used to control its motion. It can complete an action that extracts an object from a place to another. It is available for handling material in production line, machine loading and unloading work in practical application. SolidWorks is also used to model and analyze its motion.

Abstract: As a special kind of pneumatic cylinder, energizing pneumatic cylinder can increase the output force without changing diameter by a series of two or more piston on a piston rod. Since the friction characteristics of pneumatic cylinders is one of the most important factors affecting the nonlinearity, a new experimental apparatus is designed to have an in-depth study, base on exhaust throttle. The friction of energizing pneumatic cylinder was tested under different working pressure and velocity to ascertain the parameters of stribeck model. The results show that friction model of the energizing pneumatic cylinder can be the superposition of the models of each piston.

Abstract: In order to study the matching optimization of the impeller and volute as well as the flow characteristics of double-channel with double-suction pump ,this paper based on CFD performance prediction method uses the same impeller to match the volute with different base diameters, guaranteeing the volute inlet width, flow cross-sectional area, and tongue position unchanged .The calculation results show that scheme A with the largest volute base diameter can not only achieve the excellent energy characteristics and the velocity-pressure uniform distributions, but also the exchange of the fluid energy is more sufficient in the volute. On one hand, a large clearance can not only make the movement interference intensity weaken between the impeller and volute, but also can decrease the high frequency components of the pressure pulsations .On the other hand, the big gap can maximum exert the pump effects to convey liquids containing solid suspended particles as well as the fibrous suspended matters. The research can not only provide some references to further study on matching optimization of the impeller and volute but also can contribute to the hydraulic design of the impeller and volute.

Abstract: As a new emerging kind of flooring, antique style flooring has been warmly welcomed by the market. The production of the flooring is produced through artificial processing only and result in some problems. In this paper, a new patented CNC grinding system is introduced, which makes it possible to process concave-convex surface on flooring automatically. There were two major points in developing the system. Firstly, the concave-convex surface processed by this system must have the same visual effects as those processed in artificial way, denting and protruding randomly and maintaining the natural beauty of wood. Secondly, efficiency was another key point for this system. Research goal was to realize the continuous processing, so that more products could be obtained in a shorter time. Test results show that the system could achieve the original design purpose thus providing with a new technology for concave-convex surface processing of antique style flooring.