Advanced Materials Research Vols. 219-220

Abstract: The vibration data processing of environmental spectrum is an important part of environmental reliability test for the aircraft. Based on the inductive methods for environmental measured data of vibration, an inductive arithmetic is employed to estimate the random vibration data of aircraft surface in Matlab system. Numerical experiments show that the inductive estimation arithmetic is effective, reliable and applicable for the environmental measured data of random vibration.

Abstract: Based on 150 seats BWB civil aircraft, an aluminum triple-bubble cabin model are built. By large deformation analysis, the triple-bubble cabin is indicated the bending stress theory of non-cylindrical fuselage in the internal pressure. Zero-order parameter optimization arithmetic is employed to optimize the sizes of skin, stringers, beams and ribs in the triple-bubble cabin. By restricting the maximum stress and deformation, a light triple-bubble cabin configuration is obtained. The structural analysis method on the aluminum triple-bubble cabin is reliable and applicable.

Abstract: This paper proposed a digital audio watermarking scheme based on independent component analysis (ICA) in DWT domain. The embedding process make full use of the multi-resolution characteristic of discrete wavelet transform (DWT), performing 3-level DWT. Selecting the low frequency coefficient appropriately as the embed location to make sure of the balance between the transparency and robustness. Then constructing the ICA model to embed the watermarking. The extraction process is similar with ICA’s goal, it’s used in extraction makes the scheme simple for implementation. The experiment results show that the proposed scheme has good robustness against common attacks, as well as transparency.

Abstract: Aiming at the difficulties from adopting numerical calculation to solve storm surges at specific geographic, a coupling method of Support Vector Machine (SVM)-based storm surges prediction model and GIS was proposed in this paper. Utilized the powerful function provided by GIS including spatial analysis and data support, and rich graphic expression, combined with the advantages of model at the remarkable ability of numerical solution and analysis and forecasting, it can present spatial correlation and trends of spatial changes. The coupled result shows the spatial and temporal distribution chart of storm tide, which, to a certain degree, increased the analytical capabilities of MGIS and the ease of the model.

Abstract: A similar structure model has proposed for three-storey building structure based on similarity theory, thus differential equations are established for the 4-DOF vibration system. According to the vibration characteristics of resultant structures, the mass, stiffness and damping coefficient are obtained by using genetic optimum algorithm, and then an MRF absorber has been designed and fabricated based on the optimized absorber parameters obtained. Furthermore, a set of semi-active vibration control testing system for building structures is designed and a pilot study on the damping effect of the MRF absorber has been performed. By adjusting the shock absorber damping force, inertia force and movement frequency synchronously against the external excitation force, the installed MRF absorber could significantly reduce the vibration amplitude of the considered building structure, clearly evidencing the damping effect of the MRF absorber.

Abstract: This paper aimed at solving the difficulty of nonlinear process control by classical PID controller. The author structured a GA-PID controller taking advantage of the multipoint optimizing and fast compute speed of GA, which can get the optimal PID parameters by on-line turning. At the same time, the author introduced a CMAC feed-forward controller which make full use of the high precision to approach nonlinearly object of CMAC. Combine them, a concurrent pattern control method appear, which synthesize advantages of two controllers and is more fit for nonlinear process. The simulation result indicated that the method has high accuracy and good robustness.

Abstract: Construction of agile supply chain enables enterprises to share their process, application and data in different regions, different computing environments and different applied systems. We studied data flow between enterprises in steel manufacturing industry supply chain and made analysis of supply chain nodes, data transfer and interactive process then put forward key services that need to be provided between different nodes, identified service agents and established inter-service interaction model .Finally, we implement the agile supply chain information integration system in manufacturing industry based on service-oriented architecture and web service ,which provides interfaces of the standard data structures and communication methods between manufacturers and external systems. Test data demonstrate that this solution makes the information exchange between systems of enterprises easier, flexible and extensible.

Abstract: The most important thing of the detection system is the locating accuray of the pattern edge. With respect to the conventional sub-pixel localizaton algorithm and the irregular edge of the target image, a Gauss curve fitting edge localization algorithm in gradient direction is presented based on the Sobel operator and the usual curve fitting edge localization algorithm; according to a gradient distribution of a target image, a Gauss curve is used to fit defected edges so as to realize sub-pixel location of the edges. Experiments demonstrate that the proposed method is rightness and effectiveness, can obviously improve the accuracy of edge localization and target recognition.

Abstract: In general stochastic delay neural networks with Poisson jump and Markovian switching do not have explicit solutions. Appropriate numerical approximations, such as the Euler scheme, are therefore a vital tool in exploring their properties. Unfortunately, the numerical methods for stochastic delay neural networks with Poisson jump and Markovian switching (SDNNwPJMSs) have never been studied. In this paper we proved that the Euler approximate solutions will converge to the exact solutions for SDNNwPJMSs under local Lipschitz condition. This result is more general than what they deal with the Markovian switching term or the jump term.

Abstract: In order to improve hybrid electric vehicle’s energy efficiency, this paper did a research on the regenerative braking system of HEV. In this paper we proposed a new parallel regenerative braking control strategy for HEV and analyzed its characteristics in details. Based on theoretical analysis, we developed a parallel regenerative braking controller for a certain HEV, and built hardware-in-the-loop simulation system to test the controller’s performance. We chose the UDDS driving condition for simulation, and the result shows that the regenerative braking controller we developed is effective and reliable. The controller fulfills the parallel regenerative braking control strategy and distributes the braking force accurately. The energy recovery efficiency reaches 16.7%, which significantly improves the vehicle’s energy efficiency.