Applied Mechanics and Materials Vols. 341-342

Abstract: To improve the reliability of control system and reduce the components, a stepper motor controller is designed. The excogitation also affords corresponding hardware implementation methods and software process. The control system is with LM3S2110 as its core. The stepper motor is driven by DRV8813 and the interfacing technique between CH452 keyboard and LED driver are given. It turned out that the system can simplify the design scheme in a economical and reliable way.

Abstract: control strategy is one of the most decisive techniques in Hybrid Electric Bus (HEB) and directly influences the dynamic performance and fuel economy. For achieving the best fuel economy and keeping the battery for a long time, First, power analytic control strategy was built; then, the hybrid optimization algorithm (HOA) based on Multi-island genetic Algorithm (MIGA) and NLPQL was built by ISIGHT software. HOA is adopted in control strategy parameters of HEB optimization. The results show that the best result can be obtained in few iterative times by HOA, the calculation time was reduce by 12 hours, the fuel economy was improved by 12% and find the rules between control strategy parameters and fuel economy the balance of the battery state of charge (SOC).

Abstract: Modeling method of non-linearities objects controlled have more problem and difficulty. Based on the increment function observer (IFO-Kx), this paper gives the mathematical conceptions of Increment Function Observer with variable gain IFO-K(T(t)) x and the Increment full dimension State Observer with variable gain ISO-T(t) x, which makes the application of increment observer extending to non-linear slow-time-varying controlled system. In this paper, the sufficient condition of IFO-K(T(t)) x and ISO-T(t) x is presented, and comparing this condition with the sufficient and necessary condition of increment function observer, the useful conclusion for practical engineering can be obtained that the design of increment observer can avoid seeking the solution of Sylvester matrix equation, which provides the more maturity theory foundation for the engineering application of incremental observer.

Abstract: In order to improve the sense of cooperation of robotic fishes between each other to complete the task with high efficiency, this paper presents a path planning method for multi-robot fish based on the cooperative game model. With a mathematical model established on the cooperative game which is based on the game theory, the robotic fish in this system corresponds to the other participants in the game, benefit function of the game player on the cooperation model of multi-robot fish path construction is studied in this paper, which gets system Pareto optimal solution, then getting the optimal path of the entire system. Using the above method, the authors simulate and analyze on the robotic fish in water 2D simulation platform, and to use Matlab to simulate robot fishs track. The results of analysis indicate: Applying the path planning theory in the multi-robot fish movement system is effective and feasible, and that avoids planning only a single robotic fishs optimal path in the system, while leaving the movement of system in the beneath coordination.

Abstract: In view of parameter uncertainty in the magnetic levitation system, the adaptive controller design problem is investigated for the system. Nonlinear adaptive controller based on backstepping is proposed for the design of the actual system with parameter uncertainty. The controller can estimate the uncertainty parameter online so as to improve control accuracy. Theoretical analysis shows that the closed-loop system is stable regardless of parameter uncertainty. Simulation results demonstrate the effectiveness of the presented method.

Abstract: In order to achieve the quick and accurate adjustment of the robot fish, there are two plans, which are based on ant-colony-algorithm movement strategy. These plans are aimed at 2D robot fish in the ant colony algorithm, and the key judgment of the robot fish relies on the branches of physic matters, together with the best match of the fish in its current speed. However, according to the dynamic algorithm project, the feedback of dynamic variable movement can process adjustment automatically. In every period, these two examples by which the 2D Simulation results show the robot fish can be adjusted on the policy path. To achieve optimal combination of speed and direction, the shortest time has a strong ability to adapt effectively to meet the simulation of robot fish or action of the action decision-making.

Abstract: This study aims to evaluate the navigation performance of navigation systems. To this end, we comprehensively investigate 12 methods for calculating circular error probability (CEP). Using data processing techniques, we classify these methods into three categories: parameterization of one-dimensional variables, computation of bi-normal random variables, and numerical integration. From these methods, we develop algorithms and programs, which are subsequently applied in evaluating the positioning accuracy of navigation systems. Using the algorithms and programs, we perform simulations to evaluate applicability and evaluation accuracy under the same initial conditions. Practical test data are employed to validate the results. Using the comparison of the methods as bases, we put forward a comprehensive practical method regarding sample number and evaluation accuracy.

Abstract: In the paper, we introduce the distance function of K-L information to replace the conflict coefficient in order to solve the constraint problem of D-S evidence theory in information fusion and achieve the feature recognition aggreation of Multi-source information under the conflict condition. Simulating results show that: the effective conflict identification of K-L information distance can complete the application constraint of D-S theorys synthetic rule, obtaining the optimized convergence results for synthesis of normal conflicting evidences, isolating the highly conflicting evidence.

Abstract: In order to improve the property of automotive power-train vibration isolation, reduce the vibration that is transmitted by the power-train to the vehicle chassis, we adopt an active control mount (ACM) which consists of elastic rubber and piezoelectric stack actuator in the system. A hydraulic mechanism is used in the ACM to achieve higher displacements. Through the analysis of the property of the rubber and piezoelectric stack actuator, a mechanical model of the active vibration isolation system with the active mounts is established. An optimal control algorithm is presented for engine vibration isolation system, the controller is designed according to linear quadratic regulator (LQR) theory, the linear quadratic performance index is composed of the vertical acceleration, pitching angular acceleration, and rolling angular acceleration of the chassis and the control signals. Simulation results show that active control system of ACM, effect in reducing body vibration than the passive system is obvious.

Abstract: In this paper we used He-Ne laser with 632.8nm and prism with aurum film to do the experiment, used Kretschmann configuration excite the surface plasma waves (SPW) on the prism with aurum film,and measure the attenuated total reflection (ATR) spectrum. The thickness of the nanofilm and the negative permittivity of the aurum were obtained.