Applied Mechanics and Materials Vols. 229-231

Abstract: Vibration monitoring is widely recognized as an effective tool for the detection and diagnosis of incipient failures of gas turbines. This paper presents a review of vibration based methods for turbine blade faults. Methods typically involved analysis of blade passing frequencies, and extraction of dynamic signals from the measured vibration response. This includes frequency analysis, wavelet analysis, neural networks and fuzzy logic and model based analysis. The literature reviewed showed that vibration could detect most types of blade faults on the basis that dynamic signals are correctly extracted using the most appropriate signal processing method.

Abstract: Lane departure warning system based on surrounding view is a human-made decision such as solution to avoid lane departure fatalities with low cost and high reliability. In this paper, the key parameters of time to lane crossing (TLC) and distance to lane crossing (DLC) are all calculated from image processing(the corner detect and the optic flow). In the warning module, two strategies are proposed to improve the reliability of the system. After adjusting the threshold values on abundance frames of consecutive images, the refined threshold of the two strategies are determined. Finally, the proposed strategies are incorporated into our lane departure warning system to be tested in off-line simulation. The results indicate the efficiency and feasibility of our system.

Abstract: Since the last decade, vehicle tracking has been attracting significant attention in a wide range of applications. To deliver on their requirements, these applications need a specific tracking accuracy. However, current tracking techniques lack the required accuracy, especially for mission critical applications. Although these techniques have demonstrated significant performance improvement, there remain situations that give rise to degraded tracking accuracy, a deficiency that many applications cannot tolerate. This has motivated the research and development of advanced tracking. In this paper will be the design and implementation of an inertial navigation system (INS) using an inertial measurement unit (IMU) and GPS by Matlab simulation software. The INS is capable of providing continuous estimates of a vehicle’s position and orientation. And Comparative study of different types of estimation filters (KF, EKF) which has high accuracy is used to improve system state estimation.

Abstract: Acoustic emission (AE) measurements are one of many non-destructive testing methods which had found applications in defects detection in machines. This paper reviews the state of the art in AE based condition monitoring with particular emphasis on rotating and reciprocating machinery applications. Advantages and limitations of the AE technique in comparison to other condition monitoring techniques in detecting common machinery faults are also discussed.

Abstract: This paper, present a novel model to resolve the problems of evaluating trust value of nodes, and prepare a dynamic supervising in ad hoc network as well. Trust evaluation is not only based on direct interactions among nodes, but also observing previous behaviors of nodes, which come from all interactions through the network. This model specially decreases the delay time of selecting a new head for each cluster, which leads to prepare a dynamic monitoring in intra cluster and inter cluster in ad hoc network.

Abstract: Each UAV require a robust collision detection in its operating system to ensure it can aware the potential of collision in near future. Collision detection algorithm is one of the important parts that need to be concerned in the CAS. This paper proposes a design of collision avoidance algorithm for unmanned aerial vehicle based on circle overlapping test. Assuming two moving UAV are flying in the same altitude and in straight path within a two dimensional plane as conflict problem. Both UAV are cooperative aircrafts which communication of position, heading angle, waypoint, and velocity are allowed. The proposed algorithm will determine the collision potential between the surrounding intruders according to the conflict information.

Abstract: A flexible video colorization system is proposed that propagates color from one frame to its adjacent frames based on acquiring color from neighboring pixels, color interpolation, connected component analysis, and post processing to accomplish the work of video colorization. Users can obtain a preliminary result by setting some proper thresholds, and then get a finer result in the post processing stage. The experimental results show that our approach can provide satisfactory colorization results.

Abstract: An array of 128×128 digital pixel sensors (DPS) that performs both in pixel light current integration and analog-to-digital conversion is presented. The pixel fabricated on a DP4M CMOS process provides a digital output of ultraviolet light intensity via an integrated multiple-channel bit-serial (MCBS) ADC. Due to low light current (~pA) of ultraviolet focal-plane-array, the architecture of capacitive trans-impedance amplifier (CTIA) is used. The proposed readout integrated circuits have a 12-bit resolution, 70dB dynamic range and 99% of linearity.

Abstract: Electric utilities faced with the prospect of increasing customer rates are seeking solutions to challenges presented by rising global energy demand, aging infrastructure, increasing fuel costs and renewable portfolio standards in light of climate change. Many consider Smart Grid to be one such solution. The most two significant characteristics of Smart Grid are self-healing ability and high reliability. As the bottom stage of development of Smart Grid communication system, the signal quality and self reliability of PCB design directly influence the entire performance of the communication system. This article focuses on analyzing reliable PCB design suited for Smart Grid communication system from power supply, thermal dispersion and trace routing.

Abstract: In this paper, a 12-bit 100MS/s pipelined ADC is designed. Capacitance flip-around structure is used in sample and hold circuit, and bootstrap structure is adopted in sampling switch which has high linearity. Progressively decreasing technology is used to reduce power consumption and circuit area, where 2.5bit/stage structure is used in the first two stages, 1.5bit/stage structure is used for 3rd to 8th stages, and at the end of the circuit is a 2bit-flash ADC. Digital calibration is designed to eliminate the offset of comparators. Switched-capacitor dynamic comparator structure is used to further reduce the power consumption. The ADC is implemented by using TSMC 0.18m CMOS process with die area be 1.23mm×2.3mm. SNDR and SFDR are 65dB and 71.3dB, when sampling at 100MHz sampling clock. The current of the circuit is 96mA under 1.8V power supply.