Applied Mechanics and Materials Vols. 321-324

Abstract: The fuzzy adaptive integral sliding mode control is used, take advantage of sliding mode switching surface weaken the steady-state error and improve robust performance and the precision of steady-state of single maglev guiding system. the output of fuzzy adaptive controller is used to replace the output of switch control for the chattering problem of sliding mode control, and the adaptive control is introduced to estimate and adjust the fuzzy and clear gravity center value. Simulation results show that system achieves good performance with strong robustness.

Abstract: In this paper, we concerned the problem of sliding mode of-control with stochastic stabilization of uncertainty. Some sufficient conditions are derived for this class of robust feedback stabilization of time delay systems. The stochastic time delay systems may switch from one to one corresponds of linear filter, such that the dynamics of estimation error is guaranteed to be stochastically stable in mean square. Moreover, it is shown that for a class of special linear stochastic neutral systems, the H-sliding mode control design can be obtained by solving linear matrix inequalities (LMIs).

Abstract: Structure of Helical rotor is complicated.3D visualization automatic modeling of Helical Rotors with CAD could make the design of product more efficient. Scheme of 3D visualization automatic modeling of Helical Rotors is described in detail and Generation Principle of end surface curve of rotor and Scanning helix is analyzed deeply in the paper. With the further development of SolidWorks by Visual C#, 3D Visualization Automatic Modeling of Helical Rotors is accomplished .

Abstract: In order to increase the reliability and efficiency of the kineto-static analysis of complex multibody systems, the corresponding vector bond graph procedure is proposed. By the kinematic constraint condition, spatial multibody systems can be modeled by vector bond graph. For the algebraic difficulties brought by differential causality in system automatic kineto-static analysis, the effective decoupling method is proposed, thus the differential causalities in system vector bond graph model can be eliminated. In the case of considering EJS, the unified formulae of driving moment and constraint forces at joints are derived based on vector bond graph, which are easily derived on a computer in a complete form and very suitable for spatial multibody systems. As a result, the automatic kineto-static analysis of spatial multibody system on a computer is realized, its validity is illustrated by the spatial multibody system with three degrees of freedom.

Abstract: The dynamic models of the infinite cylindrical shell with integrated piezoelectric actuator are derived firstly in this paper, then, the total input power flow is calculated and expressed as the Hermitian quadratic form to act as the objective function to implement the control. The optimum set of secondary force is obtained by using feed-forward quadratic optimal theory, and the total input power flow with control was calculated for different locations of the actuator. The results show that different axial and circumferential locations will induce different influences on the control effect, and the results are greatly related to the vibration type and the circumferential mode.

Abstract: Through the research on types and characteristics of lithologic reservoirs of Fuyu oil layer in Honggangbei area, Songliao Basin, such types of lithologic reservoirs is identified from up-dip pinch-out sandstone reservoirs, abandoned channel screened reservoirs, local-oscillation channel sandbody reservoirs, fault-lithologic reservoirs, fault-structural nose reservoirs. Its characteristics are complicated distribution of oil and water, rapid lateral change of reservoirs and monosandbody pool-controlling. Through fine dissection of developed reservoirs, the results show that genetic monosandbody traps are minim oil-controlling units, oil-accumulating units and main controlling factors for lithologic reservoirs of Honggangbei, which it is controlled by vertical layer and planar sedimentary microfacies. Spatial complicated superposition of vertical multi-layer and planar multi-branch monosandbody traps and mis-traps is essential reason of complicated distribution of oil and water.

Abstract: When winding yarn, the yarn tension control of a winding machine affects the quality of yarn subsequent processing. For randomicity and instability of the yarn tension in a winding machine, the paper designed a yarn tension control system based on analyzing conventional PID controller, using the fuzzy PID control algorithm to control the yarn tension system and realizing on-line self-adjustment of PID control parameters. The simulation experiment showed that system tension had better response using fuzzy PID control and eliminated nonlinearity and uncertainty of the system.

Abstract: in order to meet the requirements of the supplying system of CNG engine to the mixed state of fuel and the ejection time control of fuel, the overall structure of CNG fuel ejector is given. The structural characteristics of the main components of the CNG ejectors are analyzed and the structure parameters which have significant effect on the performance of the ejector are designed and calculated. Through the calculation on the through-hole diameter, spring, coil and minimum wall thickness, it is indicated that the designed ejector satisfies the demand of the jet pressure and jet control.

Abstract: The papaer is to study telescopic boom material handler, carried out forces analysis on a typical three section telescopic boom, results indicated that the boom working in horizontal position is the most dangerous situation, Adopted the CAD software of SolidWorks to build the three dimensional models of telescopic boom, then used the FEA component of SolidWorks Simulation to carried out finite element analysis(FEA) respectively for three sections of boom, obtained FEA results. By the use of comparing the stress testing results with the finite element analysis results, certificated that the finite element analysis models are reasonable and the finite element method by Simulation is feasible and reliable. All of these works have very important reference value for designing and optimization of the telehandler in the future.

Abstract: The elastic constants of FeP with orthorhombic structure were calculated by using the density-functional theory method. The formation enthalpy, electronic density of states, bulk modulus, and lattice parameters of orthorhombic FeP were also calculated. All of the results are in good agreement with the experimental data and theoretical results available. The results indicate that orthorhombic FeP intermetallic compound is brittleness.