Advanced Materials Research Vols. 791-793

Abstract: The unsteady hydrodynamic accurate calculation is the premise of submerged body trajectory design and maneuverability design. Calculation model of submerged body unsteady hydrodynamic with the movement in the longitudinal plane was established, which based on unsteady three-dimensional incompressible fluid dynamics theory. Variable speed translational and variable angular velocity of the pitching motion in the longitudinal plane of submerged body was achieved by dynamic mesh method. The unsteady hydrodynamic could be obtained by model under the premise of good quality grid by the results. Modeling methods can learn from other similar problems, which has engineering application value.

Abstract: Time interval and distance interval are the two main constraints restricting the relationship among activities in the linear scheduling method. However, in previous researches, these two constraints are always considered separately, hence resulting in different linear scheduling models. In this paper, a linear scheduling model with two-dimensional constraints, considering both the time interval and the distance interval, was proposed. Meanwhile, a new algorithm was applied to this model. An example from literatures was calculated using the new method, the correctness of which was then confirmed by the results.

Abstract: X-PLY Corrugated Paperboard is a new type of cushioning packaging materials, which has a light weight, strength and stiffness and other advantages, usually be made into cushioning pads (pieces) and used in the field of logistics and transport packaging to protecting internal product from shock and vibration. In the actual logistics process,external vibration excitation is often caused package resonance and lead to final damage of the package, so understanding the package natural frequencies and mode shapes, which can avoid package resonance factors causing unnecessary losses. By using of Lanczos modal analysis method in ANAYS simulation software, we obtains the first-fourth natural frequency and vibration mode of X-PLY (A) corrugated paperboard cushion pads under three different static stress. By compared simulation results with the previous experimental results, it can be referenced for the promotion and application of X-PLY corrugated board in the field of Cushioning packaging.

Abstract: Rule extraction is a main goal for rough set theory. This paper mainly constructs a new algorithm (LBRM Algorithm) for rule extraction based on rough membership. The confidence principle is established based on rough membership. Thus, LBRM Algorithm is proposed by utilizing discretization and clearness strategies under the fuzzy environment, and is applied to both interval rules and general rules in fuzzy classification. LBRM Algorithm effectiveness is illustrated by a medical example. In particular, LBRM Algorithm integrates the confidence on both previous LBR Algorithm and fundamental rough membership, and has some improvements on rule confidence.

Abstract: An approach called pseudo-peripheral was utilized to determine the starting cell for the Reversed Cuthill-McKee (RCM) algorithm. Then this approach was validated in a cavity domain, and consequently showed high efficiency during the renumber procedure. With such rapid renumber method, an implicit computational aerodynamic solver was established. The results of flow around wing NACA0012 reflected that the aerodynamic solver is efficient and accurate enough for engineering application.

Abstract: Particle Swarm Optimization (PSO) is a new intelligent optimization algorithm and it iteratively searches the parameter space in parallel to optimize. The method is simple and practical, with fewer adjustable parameters which has been widely researched and applied. This paper intends to make PSO to the modeling parameter of the least squares support vector machine (LSSVM), to improve its positioning effect and precision of modeling positioning.

Abstract: A new algorithm was developed for the initial parameters optimization of guided projectiles with multiple constraints. Due to the relationship between the analytical guidance logic and state variables of guided projectiles, the Radau pseudospectral method was used to discretize the differential equations expressed by control variables and state variables with multiple constraints into series algebraic equations, only expressed by state variables. The initial parameter optimization problem was transformed to a nonlinear programming problem, and the sequential quadratic programming algorithm was used to obtain the optimal combinations of initial height and range to target, and make the final velocity of guided projectiles maximum with constraints. Comparing with the appropriate initial conditions solved by Monte Carlo method and the flight characteristics solved by integrating the original differential equations in the optimal initial parameters computed by the new algorithm, the feasibility of new algorithm was validated.

Abstract: EigenTrust is a typical global trust model which presents a distributed and secure method to compute the global trust values for peer to peer network, but it cant judge the authenticity of the evaluation from the requesting service peer. To alleviate the problem, we present an improved algorithm based on EigenTrust trust model, called EnhanEigen. We use malicious percentage (mp) and feedback consistency percentage (fcp) as the new trust evaluation criterion to filter malicious peers. By changing the ways in which peers submit feedbacks and using comprehensive trust value, our trust model can distinguish false feedback to resist to malicious attack. Simulation experiments demonstrate that it has a better performance on ensuring the success rate of transactions and has the shorter algorithm execution time.

Abstract: Fuzzy fitness function is presented on the basis of analyzing fuzzy genetic algorithm structure. Fuzzy genetic algorithm is used to determine uncertain parameters in parameter setting process. Finally, a typical industrial process paradigm with uncertain objectives is given to illustrate the effectiveness of the approach.

Abstract: Message ferry is a controllable mobile node equipped with long distance communication antennas and rechargeable energy, to collect data in sparse wireless networks and delivery it to the base station. The Energy-Constrained Ferry Route Design (ECFRD) Problem aims to schedule the ferry route when the energy of the ferry is not sufficient to access all the nodes in the network in one tour without charging, so as to minimize the total route length of the ferry. In this paper, we propose a simulated annealing based algorithm to solve the ECFRD problem. The experimental results show that the algorithm proposed in this paper can greatly reduce the total route length of the ferry, comparing the classic nearest neighbor algorithm.