Applied Mechanics and Materials Vols. 385-386

Abstract: A new feedback optimization design method based on arithmetic sequence is proposed to design free-form optical systems for an extended LED source. Taken LED lens designed by this method as an example, we find that the design process is simple and high regional illuminance uniformity and high light output efficiency could be simultaneously achieved.

Abstract: This paper is concerned with persistence properties and unique continuation of solutions to a two-component Camassa-Holm system. It is show that there are three results about these properties of the strong solutions. In particular, it is show that strong solutions of the two-component Camassa-Holm system, initially decaying exponentially together with its special derivative, must be identically equal to zero if they also decay exponentially at larger time.

Abstract: Ant colony optimization algorithm is a new simulated evolutionary algorithm by simulating the ant routing behavior of the natural world. In this paper, the basic principle of ant colony algorithm is applied to the classic TSP problem. Simulation examples show that the ant colony algorithm has better robustness and can quickly find the optimal solution.

Abstract: It is difficult to track multitarget of which the number is unknown and time varying, especially with range ambiguity. The probability hypothesis density (PHD) filter propagates the first order moment of the posterior multitarget density, from which the number of targets as well as their individual states can be extracted. However, when tracking multiple targets via the middle or high pulse repetition frequency (PRF) radar, the problem of range ambiguity has to be solved. In this paper, a novel method for joint range ambiguity resolving and multitarget tracking is proposed. The feasibility and effectiveness of the proposed method are verified by simulation results.

Abstract: For solving Laplace equation in 2D unbounded domains, a natural BEM on non-uniform grid is derived and its convergence theorem is proved. The moving mesh methods for the NBEM and the NBE-FE coupling method are also studied. Numerical results confirm the efficiency of the methods.

Abstract: This paper analyzes the domestic and international logistics distribution route optimization problem and the research status of ant colony algorithm, illustrates the problems existing in the logistics distribution now. It reflects the necessity to research on the vehicle routing optimization problem. In order to increasing the ant colony algorithm’s convergence speed and avoiding to fall into local optimum, we improve the pheromone evaporation coefficient and visibility to optimize the searching ability, which can avoid premature convergence and stagnation.

Abstract: The water-based fog screen system for photoelectric interference, with low cost, energy-saving and environmental features, is a new type of interference material. This article describes and investigates the physical characteristics of the water-based fog screen, the principle behind the interference of visible light, infrared and other electromagnetic waves using mist, the composition of the water-based fog screen system and its significance in military applications.

Abstract: In order to overcome the shortcoming of traditional mathematical model of topology optimization which aims to the continuum structures, a new implementation combined with TOSCA Structure software is presented. To examine the accuracy of optimal topology of this kind of structural, the programming scheme for the conceptual design of one shell structure using topological optimization approaches is set firstly, then build up a new topology optimization design method of the shell structure rib model. Through the FE simulation calculations from Project 1 to Project 4, different improvement results of maximum displacements are obtained. These results demonstrate the validity and reliability of the method.