Applied Mechanics and Materials Vols. 229-231

Abstract: The problem of adaptive detection of spatially distributed targets or targets embedded in Weibull clutter with unknown covariance matrix is studied. At first, the texture and the speckle of Weibull clutter is researched, the texture expression is proposed base on the property of spherically invariant random vector (SIRV) , then the optimal detection statistics regards the texture of clutter as a certain function is derived, another detector regards the texture as an unknown deterministic parameter as a contrast. Next, the numerical results are presented by means of Monte Carlo simulation strategy. Assume that cells of signal components are available. Those secondary data are supposed to possess either the same covariance matrix or the same structure of the covariance matrix of the cells under test. In this context, the simulation results highlight that the performance loss of the two tests in different shaping parameter, then the influence of the Weibull clutter texture on detection performance of test is given.

Abstract: The performance of a Ground Moving Target Indication (GMTI) radar is determined by the interference level of the clutter to a large extent. With the longer illumination and the larger aperture, Multiple-Input, Multiple-Output (MIMO) radar greatly enhances the ability to detect the slow-moving target. This paper compares MIMO radar with conventional phased-array radar in terms of signal to clutter and noise ratio (SCNR) performance. Moreover, the paper proves the fact that the improvement of SCNR with MIMO techniques is not only limited in the antenna configuration of the side-looking but also non-sidelooking array-antenna. The analysis of mianlobe clutter and sidelobe clutter levels can greatly simplify the computation of the total clutter. Finally, the experimental simulation is been given.

Abstract: Bonding rate of ring and piston's ontology (BRRPO) is used to describe the bonding quality of inserted ring and piston's ontology. According to the basic principle of ultrasonic flaw detection, shape of inserted ring and nature of material, penetration method is utilized to detect the bonding quality. An ultrasonic measurement system is designed. The design consists of hardware and software. Controlling process of hardware has been designed legally and made the detection precise. The design of software, based on VC++, consists of accomplishment of basic functions, such as data collection and data processed, and some special functions, such as automatic detection.

Abstract: In this paper, three detection methods were analyzed to determine the chlorine precipitation from the flue gas: Silver nitrate volumetric analysis (SNVA), Volhard method (VM) and Mercuric thiocyanate spectrophotometric method (MTSM). Results indicated that SNVA and VM were simple and convenient, but unsuitable for the detection of blend fuel due to the high lower limit. MTSM was suitable for biomass and coal co-combustion for its low lower limit and high sensitivity. In addition, MTSM needed less sample solution, which made it more suitable for multiple measurements to reduce errors, and the maximum proportional error was only 3.5%.

Abstract: The measurement of wall thickness of pipelines is an important procedure of pipeline corrosion inspection. This procedure can be done automatically in a computer by processing data acquired from ultrasound probe, forming C-scan image, and running thickness detection algorithms. This paper presents in detail the comparison of three ways of processing, which are FFT algorithm, twice FFT algorithm, and improved twice FFT algorithm. The final results show that improved twice FFT algorithm has the best precision compared with the other two algorithms. It has higher accuracy than FFT algorithm and less decision error than twice FFT algorithm. Using this method, defects of a pipeline can be identified and measured effectively using ultrasonic wave.

Abstract: A new method has been developed for the determination of carbaryl pesticides, , in water and fruit samples using gold nanoparticles electrode conductivity detection. The effects of pH on the binding between carbaryl and humic acid (HA) and number of layer coated electrode were investigated and optimized. HA modified the polyelectrolyte multilayer thin films (PEMs) coating electrode was used to detect carbaryl. The current was decreased 4.75% after dipping in HA for 10 minutes. The current was decreased around 7.28% from the initial value after HA binding with carbaryl. The results demonstrated that the newly developed method was an efficient procedure for the detection of carbamate pesticides in water.

Abstract: In this paper it is shown the design, simulation and characterization of Moly Permalloy based electromagnetic sensor in MEMS software. The dimension of the device is minimized to the smallest the software can simulate which is 1 micron. Total of 9 models had been simulated which differs in thickness of the material and designs. A new design was created to compare the results with the existing designs. The creation of the new design has given better results than the existing designs in terms of the current flow and the magnetic induction.

Abstract: Metal injection molding (MIM) is a combination of metal powder and injection molding technology. The main advantage of this technology for material parts with small and complex shape is to manufacture cost-effective and high-volume products. The main processing steps include mixing, injection molding, debinding , sintering, and hot isostatic pressing (HIP) in order to reduce internal porosity of metals, then to improve mechanical properties. This study is based on non-destructive testing method to determine the possible defect inside the internal structure of the MIM parts. Three types of parts with and without HIP were evaluated investigated in this study. The micro computed tomography (Micro-CT) is used to scan these parts. Based the reconstructed section images from CT, the defects can be identified. It showed that with HIP the much of detects could be reduced. To conclude, Micro CT could be used to detect, in a non-destructive way, the internal detect within MIM parts can be found out in the micro-CT images, so that the manufacturing process could be modified to improve the quality of MIM parts.

Abstract: In this paper, the data of faulty sensors reconstruct algorithm of liquid-propellant rocket engine is developed based on adaptive neuro-fuzzy inference system. First, the input parameters selected for method is according to regularity criterion and the relationships between each parameter; second, adaptive neuro-fuzzy inference system is train by normal test, finally, the fuzzy mode is validated by normal data and the data of faulty sensor is reconstructed. The results indicate that this algorithm can reconstruct the data of faulty sensors accurately and show that the fuzzy model approach has good performance in faulty sensors data reconstruct for LRE.

Abstract: Detection and measurement of pressure plays an important role on safety at different applications such as bridge, mine monitoring. The paper design and develop a remote pressure monitoring system (RPMS). The system is composed of three layers: pressure data sensing, data collection and pressure monitoring. Firstly, the pressure changes are measured by high sensitivity strain gauge and the signal is transferred, amplified and A/D converted; secondly, the pressure data is transmitted from different pressure sensing points to monitoring points; thirdly, after local stored, they are further sent to server center which can real-time monitoring all necessary sensing points. The prototype has also been implemented to verify the efficiency and effectivity of RPMS.