Applied Mechanics and Materials Vols. 380-384

Abstract: Genetic algorithm is the most widely used and successful bionic optimization algorithm. In this paper we will discuss the tasks scheduling problem on equipments, establish a general mathematical model and put forward a hybrid genetic algorithm to solve this problem. The simulation results show the effectiveness of the hybrid genetic algorithm.

Abstract: The accuracy of mathematical model has a great effect on the prediction of ships maneuverability. Wave disturbing force is an important element of the Maneuvering Mathematical Modeling Group (MMG). Building regression formula of wave disturbing force acting on the ship hull can not only increase ship mathematical models accuracy but also help to predict ships maneuverability. The wave force can be calculated by the Computational Fluid Dynamics (CFD) method, which is more accurate and economical. The 3D model of M/V YUKUN was established and the cut-cell mesh was made. A numerical wave tank was developed in this work, based on the FLUENT software. The calculation results were obtained with different height, length, and period of waves. After analyzing the calculated data obtained by the CFD simulation, a regression formula was built about the above parameters. Finally, after comparing the regression formula and tradition wave force model based on the slender body theory, it can be concluded that the regular transverse wave force regression formula of the YUKUN is valid and better to make simulation for the prediction on ships maneuverability.

Abstract: Performance of high-speed and high-resolution current-steering DAC is hardly suffered from non-ideal factors such as current-steering source mismatches. This paper presents a dynamic performance improved algorithm for current sources selection of current-steering DAC, the most attractive features of the algorithm are random direction and random origination address during current sources selection. The simulation results show this algorithm enhances randomness during current sources selection and exhibits better dynamic performance than many other methods.

Abstract: In this paper, we Research on Propagation Numerical Simulation and damage effect of Blast Shock Waves in Subway Station by using LS-DYNA dynamic finite element calculation program , the results reproduce the formation process of the explosive flow field, and analysis the shock wave waveform, attenuation and walking pattern, provides the theoretical basis for further experimental study.

Abstract: In this paper, the relationship between the number of entrance and exit, and traffic flow volume. When the number of entrance and exit is equal to 4 or greater than 4, and when the weaving section length is taken into consideration, the relationship has been studied in detail. For a given traffic circle, the road conditions in, around and out of the circle have been determined. We treat these calculation results as the reference criteria and construct two models. The one is regular critical space model and the other is two-left-turn phase control model. Finally, taken by the example of Lianban Circle in Xiamen, China, the above models have been tested and their strengths and weaknesses have been analyzed.

Abstract: As its international status, mastering C programming language is very important, for example the java language, popular and widely used at present, which has all kinds of connections with C programming language. In the C language, the bubbling sort, which has the knowledge of the cycle and array, has been seen as classic examples to explain, and also is used in a variety of computer exams. One important reason is the bubbling sort itself more classic; another is that it is not easy for students to grasp and understand the bubbling sort. This paper will explore a new teaching method--introduction of mathematical thought--to help students to understand and master the bubbling sort.

Abstract: Ant colony algorithm is a kind of intelligent algorithm imitating the group behavior of ants. The positive feedback mechanism is not only its advantage which makes the ant colony algorithm quickly converge to optimal solutions of a problem, but also its defect which makes it easy to fall into the local optimal solutions. ACS and MMAS are the two typically improved ant algorithms by introducing the pseudo random probability selection rule and maximum-minimum pheromone restriction rule to accelerate the converging speed of this algorithm and avoid falling into local optimal solutions. At present, there is no algorithm put forward to improve the algorithm using the effect of the heuristic information. This paper presents an improved ant colony algorithm based on the heuristic information of direction, and provides a new idea for the study on the improved ant colony algorithm.

Abstract: In this paper, a proactive strategy is proposed to analyze the system reliability in electric vehicles (EVs). The EVs system reliability is crucial and difficult to estimate because more electrical subsystems are employed such that the system is more complicated. Besides the component failure, we consider the uncertain dependency between components by using uncertain the logical structures of failure. The proposed method is theoretically based on the probabilistic graphical model. Therefore other tasks related to system reliability, such as fault diagnosis, can be converted to the inference problems of graphical model. Simulation examples demonstrate the effectiveness of our strategy.

Abstract: At present, the performance of the vehicle dynamics model is mainly evaluated objectively through offline simulation. In this paper, a vehicle dynamics model was implemented in dSPACE, which was applied to the Automotive Performance Simulator and the preliminary study was made for the realization of the subjective evaluation of the performance of vehicle dynamics model through the real-time closed-loop online simulation. The dSPACE interface library was used to write a Clib program to operate and control the Carsim RT model running on the dSPACE platform, which realized the communication between the external hardware and the real-time hardware of dSPACE.

Abstract: Given two tubes with non-coplanar axes whose sections are circle, we acquire that axes of the tubes can be smoothly blent by cylindrical helix. In this situation, the paper proposes a new method to build the blending surface by generalized cylindrical helicoid tube. Meantime, we obtain smoothly blending parameter surface.