Advanced Materials Research Vols. 482-484

Abstract: In this paper, we propose a study of the (MFCS) model following control system with disturbances. With the MFCS method, we obtain a simple input control law. The bounded property of the internal states for the control is given and the utility of this control design is guaranteed. In this case, a new criterion is proposed to ensure that internal states are stable.

Abstract: Fatigue crack is very dangerous for safely operating of steel structures. To estimate precisely fatigue life of bridge cranes, the randomness of lifted load and trolley’s position should be considered. Therefore, bi-probability fatigue life prediction method, namely load and position probability, is put forward based on the miner linear cumulative damage theory. Stress cycle spectrum is constructed based on real-time monitoring data by rainflow counting method. This method can successfully explain the existence of girder cracks in a typical bridge crane RMG, so it would provide valuable reference for maintenance decision of in-service cranes.

Abstract: The compositions, principles and features of infrared sensors, ultrasonic sensors, microwave sensors and combined sensors in intrusion detection system are discussed in this paper, then the applications and installation skills of several common intrusion detection system are introduced.

Abstract: Based on the incompressible smoothed particle hydrodynamics (ISPH) method, a program was developed to simulate the non-Newtonian fluid flow in the mixing section of a single screw extruder. The transverse flow in the extruder is mimicked by one 2-D lid-driven cavity flow. The mirror particles are used to treat boundary. The power-law model is used to calculate the viscosity of the fluid. The shear-thinning, the shear-thickening and Newtonian fluid in the single screw extruder are simulated and deeply analyzed. Through comparing the velocity profile along the centre of screw extruder with the theoretical solution, this method has been proven to be accurate and effective. It laid the foundation for the simulating of the more complex 3-D model.

Abstract: D-OSGi call on the remote service by Webservice ,which accessing through the SOAP based-on HTTP and publishing the service By WSDL .But when publishing the service ,we need configuring the XML file, facing so many documents ,the System will delay than before, and influences the performance. Every Service registered by UDDI has no safety policy. Therefore, it propose Agent when invoking the remote service on this paper, we can publish the service By Agent and no long use the configuration document. by this way, we can guarantee the safety of revoking service.

Abstract: The major objective of tolerance analysis is to check whether the resultant or assembly tolerances conform to the design specifications in individual components. Although the first four moments were used to describe assembly reject rate, there are no further applications in reliability index and assembly yield. Therefore, a novel tolerance analysis method to estimate the assembly yield based on first four moment reliability index is proposed. Firstly, some basic definitions are given. Secondly, the tolerance analysis model based on the first fourth moment reliability index (FMRI) is developed. Furthermore the assembly yield models based on FMRI, for both individual design function and multi-design functions are presented.

Abstract: In this paper the system of air-source heat pump water heater(ASHPWH) using R134A to get 75°C hot water is proposed. The experiments on the performance of ASHPWH are conducted in two typical conditions, one for 7°C dry bulb temperature and 6°C wet bulb temperature, the other for 20°C dry bulb temperature and 15°C wet bulb temperature. In addition the variations of the suction temperature, the exhaust temperature, the suction pressure, the exhaust pressure, the transient heat capacity, the input power and COPs with the changing of the hot water tank temperature are analyzed. The results show that 75°C hot water can be produced steadily and the COPs are 2.84 and 3.68 respectively in two different conditions, therefore the ASHPWH has good energy saving effect.

Abstract: This paper investigated the process optimization of electronic flame-off (EFO) which was the melting of a wire tip by an electrical spark to form a free air ball (FAB) for 1.8mil copper wire bonding. The results showed that sparking current and sparking time rather than tail length were the key factors to influence the form of FAB. The FAB was skew and coarse with very small diameter when sparking current was 110mA. However, the FAB would be burned-out when sparking current was 180mA. And the appropriate sparking current was proved to be 130mA~150mA. When sparking time was too short (0.8ms~1.0ms), the FAB would appear to be pointed ball or golf ball. However, when sparking time was too long (3ms), the diameter of FAB was much bigger which led to offset ball and golf-bond. The suitable sparking time was proved to be 1.2ms~2ms.

Abstract: This paper presents the design of a portable optical PSD (Position Sensing Detector) for application in outdoor environment. The system is able to measure changes in the position of a light spot emitted by a usual laser device (635-1000nm wavelength) in outdoor environment. A piece of frosted glass is employed as the target to show the light spot, and a narrow-band filter and 1% neutral filter are adopted to reduce the interference from sunlight. The paper uses a pinhole camera to reduce the device volume, but lens distortion with off-the-shelf cameras is significant. The image manipulation circuit corrects the distortion, and displays the light spot center position.

Abstract: By modifying the modulated waveform, a new communication modulation method, which is called C-WQPSK, is proposed in this paper. This method based on direct carrier QPSK, didn’t consider baseband pulse signal, and redesigned the modulating waveform, its phase angle jump and jump to change duration time all can be changed. Results of the numerical tests indicate that, the method is correctness and effectiveness. Compared with direct carrier QPSK, the method can keep the BER performance, meanwhile, power spectrum decline rate, the energy of modulated carrier wave, and anti-interference ability are improved and enhanced, so it owns high theory significance and engineering application value.