Applied Mechanics and Materials Vols. 246-247

Abstract: According to the characteristics of the four independent drive (4WID) electric vehicles, the vehicle driving state estimation algorithm was designed based on the Unscented Kalman Filter (UKF). The algorithm used 3-DOF vehicle estimation model with the HSRI tire model. The 4WID EV longitudinal velocity, lateral velocity and side slip angle were estimated. The algorithm was verified through simulation experiment. The results showed that the algorithm could estimate the vehicle driving state more accurately.

Abstract: Using LS-DYNA software, this paper studies the problem of an annular multi-point initiation circuit applied to an annular EFP charge, and the effects of annular EFP formation with configuration parameters of shaped charge of variable wall thickness semicircle liner by two different number of 36 initiation points and 72 initiation points. The study shows that the speed of the annular EFP with 36 initiation points arrives more than 2400m/s, and the annular EFP has the characteristic of well formation, no dispersible, energy concentration, high energy efficiency and so on. Additionally, the depth of hole is more 5.4mm than the depth of hole which is penetrate by the annular EFP with 72 initiation points. These study results provide important reference to the design of warhead.

Abstract: In order to maintain good social order, we need set some traffic patrol police service platforms at the vital communication line and important position of the city. In this paper, we will use graph theory method to deal with the problem of traffic patrol police service platform’s site selection for a fixed unban area. When there are some emergency events happened in the fixed area, these traffic patrol police service platforms should make corresponding response and close vital communication line immediately. So we also need to establish a optimal mathematics model to obtain a reasonable arrangement for closing the vital communication line. Meanwhile, building a scientific index system will help us to measure whether these arrangements reasonable or not.

Abstract: In this paper, an Ultra-wide-band (UWB) filter based on composite right/left handed transmission line (CRLH TL) is presented. The structure of the proposed band-pass filter is quite simple, of which the size is 0.5cm×1.5cm. Left-handed capacitor is obtained by couple of microstrip lines, and Left-handed inductance is obtained by the grounded stub. The simulated results indicate that the pass band of UWB filter is 3.4-11GHz, the insertion loss is less than 1 dB and the return loss is smaller than -12.5dB. The performance of UWB filter could meet the requirement of UWB communication systems.

Abstract: Aim at the deformation occurred on round steel section by abscission machine, use the software-SW/simulation to make a research about the deformation mechanism existing in the fracture, we found that the round steel fracture took place first near fixed blade ‘edge and more plastic deformation centralized in the domain like "crescent shape". The result is theoretically useful for improving the section deformation and optimizing the blade structure of round steel cut-off machine.

Abstract: Considering the larger modeling errors between the turbo-shaft engine and on-board model, the model correction method based on least squares support vector regression is proposed. Firstly, the modeling principle of on-board turbo-shaft engine model is introduced, and then the structure of model combined with a compensation module is designed. The algorithm of LSSVR is used to build up the model compensation module, which is trained off-line and corrected on-line. Simulation studies on turbo-shaft engine have shown that the LS-SVM method can effectively reduce the model errors, and comparison with the interpolation correction, neural network one, the method proposed has better precision.

Abstract: An effective analysis of the battlefield situation and spatio-temporal data model in a sea battlefield has great significance for the commander to perceive the battlefield situation and to make the right decisions. Based on the existing spatio-temporal data model, the present paper gives a comprehensive analysis of the characteristics of sea battlefield data, and chooses the object-oriented spatio-temporal data model to modify it; at the same time this paper introduces sea battlefield space-time algebra system to define various data types formally, which lays the foundation for the establishment of the sea battlefield spatio-temporal data model.

Abstract: A CAD variation geometry approach and force/torque balance equations are proposed for simulation of the accurate active force and passive force of a 3-dof 3UPU-Ⅱspatial parallel manipulator. First, an initial simulation mechanism of the 3UPU-Ⅱspatial parallel manipulator is created. Second, a variable workload which is composed of a central force F and a central torque T is constructed and applied to the center of the platform in the simulation mechanism. Third, the whole F/T (force/torque) simulation mechanism of the 3UPU-II spatial parallel manipulator is created. Finally, the extension of the active limbs, the active forces and passive forces are solved and modified.

Abstract: By the relief valve with level 2 pressure regulating structures AMEsim model to analyze the impact of various factors on the valve dynamic performance reasons; optimize the parameters of these factors in the theoretical support and click here to design methods of productionthe product test verification. The results prove the effectiveness of the proceeds of the correctness of the simulation results and the valve design and production process.

Abstract: This paper described the importance of industrialized grow seedlings. In order to realize the modern factory forestry development request, precision seeder is the very key part of mechanized seedling production line. Based on the related work requirements of seedling production line, we have designed pneumatic system of precision seeder, analyzed the principle and selected suitable components of pneumatic device. This paper provides a theory basis for the further research.