Applied Mechanics and Materials Vols. 130-134

Abstract: For the Boom and Receptacle Air Refueling, in order to locate the spatial position of the refueling receptacle, an object locating method is developed based on Speeded-up Robust Feature (SURF) algorithm. Firstly, SURF feature vector matching algorithm is used to detect and collect suitable SURF feature points in left and right images produced by binocular stereo vision system separately. Then the point that shows the same spatial position in both left and right images can be located through process such as deleting wrong matching points and calculating the image coordinate of the target point. Finally, the three-dimensional coordinates of the target points could be rebuilt in the camera’s coordinate system. According to the results of experiments, this method has good robustness and practicability.

Abstract: Owing to lack of geometric method for calculating frames with the shape of T, the conversion method is used to resolve the frames in which no joint has lateral displacement. It puts forward the analysis steps of the solution of the frame. The concrete process of calculation belongs to primary computation of algebraic equation. It gets analytic solution. The calculation sequence of an example of a frame is advanced.

Abstract: Fatigue crack propagation test is a very important testing way to study the metallic engineering material fatigue fracture characteristics by on-line measuring crack length under the cyclically varying loads. Crack length has been obtained through crack image capture, image processing and image analysis. In order to improve the crack measurement precision when the fatigue crack keeps growing, a new crack length real time measurement method based on the image processing and camera automatically tracking techniques was presented in this paper. This method includes the crack image processing algorithms and camera tracking and positioning movement control. The crack length measurement errors based on the camera tracking and fixed camera are respectively 0.076mm and 0.148mm.The experiment results show the proposed method has greatly improved the crack length measuring precision with the ordinary optical device.

Abstract: For a very long period of time, the concepts of logic or formula logic and engineering or recognition are separated strictly. It is studied in the paper about the common sense of them, and which are combined together in the course of human being knowledge learning. According to some typical examples, the conclusion was drawn and a new viewpoint was got, which would be the most artistic works in the world. The new form of logic invented in the paper, perhaps would be a general principle for modelling in the system simulation.

Abstract: Virtual reality technology is the cutting-edge subject of current computer technology and research focus. This paper mainly research the key technologies of virtual reality system based on the panoramic view, including image acquisition, correction, splicing, fusion, re-projection panoramic images such as a set of system solutions. In this paper proposed rough match based Fourier transform and exact match based edge gradient-feature, which can mosaic the two matching images, to save calculation time and improve speed.

Abstract: How to find the solution of multi-objective optimization quickly and exactly is the challenge of multi-objective optimization design. This paper explores the feasibility of multi-objective optimization solution briefly in theory, and makes a high-speed train’s anti-creeper as an example which using multi-objective design optimization software to find the feasible solution. Nastran and LS-Dyna are respectively adopted to solve the linear static and collision study analysis of the anti-creeper. In this paper Nastran and LS-Dyna are integrated on Optimus which is MDO platform to make a MDO of anti-creeper. The anti-creeper optimization analysis is proceeded based on many indexes satisfied, and its multi-objective Pareto solution of its minimum mass and biggest internal energy comes out. The method of multi-objective optimization solution in this paper is solved well in MDO.

Abstract: To assess the energy demand and environment effect on residential sector, a bottom-up LEAP Henan model was developed to simulate three different scenarios from 2005 to 2030. In this paper, by taking Henan Province as an example, the simulation results showed that the implementation of policies and technologies to promote the degree of intensity of energy demand and utilization had a great impact on the energy consumption structure, and the greatest difference in energy demand in three different scenarios reached 9.8Mtce, and the CO₂ emission produced by direct energy consumption from end users in three different scenarios had a downward trend.

Abstract: This paper proposes a modified particle swarm optimization to solve identification of tuning PID controller parameters. This paper elaborates the process that MPSO algorithm optimizes PID parameters in double-loop speed control system modeled by simulink. Through analyzing the results of the MPSO optimization, and comparing with standard PSO(SPSO) and traditional method, MPSO algorithm has better dynamic performance, provides a high performance methods for PID parameters optimization.

Abstract: The Gaussian particle probability hypothesis density filter (GPPHDF) needs conventional Monte-Carlo (MC) sampling in predict step and update step, which decreases the accuracy and real-time performance of the algorithm. This paper employs Quasi-Monte-Carlo (QMC) sampling to replace MC sampling, and QMC integration method is introduced to approximating the prediction and update distributions of target states. Hence a tracking algorithm based on the QMC method is proposed, which reduces the computational complexity and improves the accuracy and stability of the tracking algorithm.

Abstract: Based on moving S-N curve, a new method of fatigue life prediction for vehicle component in random loading spectra was put forward. In the new method, both strengthening and damaging of loads are fully considered in fatigue life prediction of vehicle component. The results of fatigue life prediction showed that the new method was more exacter than that of other life prediction models, such as Miner's rule, modified Miner's rule, Manson's bilinear theory and Corten-Dolan's theory. Only this new method could exactly predict the fatigue life of vehicle component in original or slightly strengthened loading spectra.