Applied Mechanics and Materials Vols. 321-324

Abstract: Cause of machining error for NC Machine Tools is described, and principle of NC machinings error compensation on the basis of the existing in-line detection model of NC machine tools is analyzed in this paper. Regularity of error Modeling based on multi-body system is found,accordingly, we will find the corresponding characteristic matrix and transformation matrix if location features and sport features of the adjacent body are confirmed. Then, formula of error model is found, and we can get numerical solution and compensate error according to the identified error parameter. As a result, the machining accuracy of machine tools can be greatly improved.

Abstract: In order to diminish the effect of reconstructed parameters to prediction of chaotic, a combined model for wind power prediction based on multi-dimension embedding is proposed. The combined model makes use of neural network method to achieve combination of several neural networks models based on phase space reconstruction, which can synthesize information and fuse prediction deviation in different embedding dimension, resulting in forecast accuracy improved. Simulation is performed to the real power time series Fujin wind farm. The results show that the combined prediction model is effective, and the prediction error of neural network combination is less than 7%.

Abstract: Radiometric calibration of synthetic aperture radar (SAR) is an important work related to pixel values and the backscattering coefficient of ground targets. With a consideration of the difference between near space and spaceborne, airborne platforms, this paper proposes the radiometric calibration method which is applicable to near space platform. A radiometric calibration model of near space SAR is established, and it is analyzed and validated by experimental data.

Abstract: Described a driver modelbased on the improved preview follower algorithms.Proposed a new preview-point search algorithm to ensure that the preview point fall on theexpected track and avail on the large curvature road. Considered theimpact of the steady state response to improve the dynamics performance ofdriver model. Modeled and stimulated the driver-vehicle-road closed-loop modelby Dymola. The results indicate thatthe improved driver model perform a high level ofaccuracy on the target track following.

Abstract: This paper is concernedwith forced consensus problem for directed multi-agent systems with intervaltime-varying delay, whereall agents approach a constant reference trajectory under the condition thatonly a subset of the agents can receive information from the reference state. Thetime-varying delay is assumed to belong to an interval with known lower andupper bounds, but its lower bound may be greater than zero. We first propose a consensusalgorithm that extends the existing results in the literature to account forinterval time-varying delay. Then, the consensus stability analysis isconducted by introducing an appropriate Lyapunov-Krasovskii functional and using Jensen inequalitytechnique. A delay-range-dependentstability criterion is derived in terms of linear matrixinequalities, which can be efficiently solved by the interior-point algorithm.Finally, simulation examples indicatethe capabilities of the proposed algorithm.

Abstract: In most cellular propagation environments, a LOS propagation path does not exist to all of the BSs that participate in locating a target MS. The signal received by the receiver is a multipath and interference mixed signal, which is NLOS signal. In NLOS conditions, the traditional location algorithms perform poorly. Therefore, a scattering-model-based location method for cellular network was proposed in this paper. Based on the Ring of Scatters (ROS) model, with the use of the mean value of the TOA measurements, the method mitigated the effects of NLOS.

Abstract: This paper put forward a 3D reconstruction method of the headlight contours based on laser scanning technology and robotics. Firstly, according to the present three-dimensional measurement techniques, the article put forward a set of headlight contour detection method based on the analytic geometry model and the line laser source scanning principle. It establishes a 3D scanning model and coordinate transformation model for 3D reconstruction of the headlight contour. Secondly, according to the demanding accuracy it structures the 3D reconstruction system. Finally it realizes the 3D reconstruction of the headlight contour based on the method, and the result is tested and evaluated matching effect, the result shows that can effectively realize the 3D reconstruction of headlight contour and the method has a good stability.

Abstract: To change the phenomenon of "Being an armchair strategist" in current research for resolver, a simulation system of virtual resolvers is researched adopting virtualization. The fundamental principle of resolver and the developing strategy of simulation software are expatiated. Some common problems in the system developed are solved, including the way of real-time updating image, the rotor-rotating method, and the approach of adjusting parameters. In addition, examples of phase discrimination resolvers and amplitude discrimination resolvers are provided separately. This paper provides a worthy auxiliary instrument for resolvers to be researched.

Abstract: Due to the particularity of the fracture-cavity reservoir space, the seepage theory developed from homogeneous reservoir cant be applied to predict the productivity of fracture-cavity reservoir. This paper simplified the fracture-cavity system to an oil storage vessel, and based on the basic principles of material balance, established the productivity-prediction model which was suitable for the acid fracturing horizontal well in fracture-cavity reservoir. The results showed that the productivity of fracture-cavity system was high and steady. Meanwhile, the connected fracture-cavity system had a greater contribution to increasing production capacity than other factors.

Abstract: ntroduction This paper has proved that the HIC of local Car hood crash area is relative to the distance between the crash point and potential secondary crash point, and with the rigidity of the second crash point, in the process of protection for pedestrians. The pertinence formula was built and the high risky spot of each local crash areas was doped out quickly, and the accuracy of the formula is validated by the subsequent real car crash test. When the vehicles and the pedestrian have the crash accident, the pedestrian casualty rate is very high, develops the pedestrian to protect the research positively, particularly the forehead crash trouble-free service, regarding the guardian vehicle crashs in weak one the pedestrian, has the very vital significance.