Applied Mechanics and Materials Vols. 48-49

Abstract: The impact mechanism of the traditional hydraulic hammer is composed of the directional control valve and the main cylinder body. Due to the two parts damaged in different situation at work, the replacement of equipment resulted in unnecessary waste. Based on the design concept of virtual prototype technology, the virtual prototype model of improved hydraulic impactor was established with CATIA software and the directional control valve separated from the main cylinder body, in addition, the kinematics properties of the hydraulic impactor were simulated and analyzed by the dynamic simulation function of CATIA. The virtual prototype technology can reduce the input for the mock-up and Prototype, shorten the development cycle of the products and it is conducive to realize the optimal design or deformation design of products.

Abstract: Based on turnout/bridge interaction principle and finite element method (FEM), an integrated turnout/beam/pier model of jointless turnout on ballasted track was established to analyze the influences of expansion joint on stress and deformation of the turnout. The results are concluded as follows: whether the rail expansion joint is set in front of or behind the turnout, expansion additional force of stock rail will be reduced greatly at the end of the beam; so do the expansion displacement of switch rail and nose rail, the stress of displacement restrictor and spacer block, rail break gap and the longitudinal force of one rail after the other rail broke. But when the expansion joint is set in front of the turnout, the pier’s longitudinal force of continuous beam bridge and the simply supported beam bridge (within the expansion range of the device) increase greatly. When the device is close to the turnout, longitudinal relative displacement of the stock rail to the girder also increases a lot. By comparison, it is more favorable to set the expansion joint behind the turnout, or to set the device at the both ends of the continuous beam, or to set the device at the ends of continuous beam rather than in the center of the span.

Abstract: The two well known systems for measuring stiffness handle of fabrics are KES-FB and FAST both consisting of four meters, whose testing principles are multiple mechanical properties through multiple tests. It is expensive, time-consuming and no in-situ. The multiple properties through single test in principle is up-to-date technology of measurement science, which is an assembled measuring technology in-situ and measure multiple functions on the same part of a sample. The corresponding apparatus was developed for measuring weight, bending, friction, tensile/shearing and compression behaviour of yarns and fabrics (CHES-FY) and also for stiffness handle evaluation. The paper just presented the bending model, and the comparisons between characteristics including bending rigidity and stiffness from the pulling-out force and distance curve and results by KES-F & FAST systems were conducted. Conclusions showed high correlations and indicates the approach by CHES-FY be feasible and accurate in measuring bending rigidity and stiffness handle.

Abstract: In this paper, first, the relation between roughness and grinding parameters is built. Then, an intelligent dynamic identification model of surface roughness is developed, which bases on the theory of roughness during grinding and the theory of fuzzy-neural network. The inputs for the model are the grinding parameters. Besides, an accelerometer is used to gather the dynamic vibration signal in real time. The model was used in the external cylindrical grinding experiment, and the result verified that the proposed model was feasible.

Abstract: Ant colony algorithm is effective algorithm for NP-hard problems, but it also tends to mature early as other evolutionary algorithms. One improvement method of ant colony algorithm is studied in this paper. Intelligent learning ant colony algorithm with the pheromone difference and positive-negative learning mechanism is brought forward to solve TSP. The basic approach of ant colony algorithm is introduced firstly, then we introduced the individual pheromone matrix and positive-negative learning mechanism into ant colony algorithm. Next the steps of intelligent learning ant colony algorithm are given. At last the effectiveness of this algorithm is proved by random numerical examples and typical numerical examples. It is also proved that intelligent ant and learning mechanism will affect concentration degree of pheromone.

Abstract: Under the premise of transportation inconvenient, reducing pollution and environmental protection, iron concentrate pipeline transportation developing rapidly. However, due to pipeline related to fluid mechanics, solid-liquid two-phase flow, rheology, and other subjects, many scientific problems are still not resolved. Because of these problems, a further study on running control, security management, and optimize operations of pipeline transportation are needed, ensuring pipeline security, stability and efficient running. Intelligent plant design of pipeline transportation presents in this paper, taking intelligent data integration technologies, holding real-time data, running conditions of pipeline transportation and equipment, devices modeling integrated into a platform, achieving optimal scheduling, the goal of intelligent scheduling, as a result it can improve the management level, achieve energy conservation, improve production efficiency.

Abstract: Building on three theoretical paradigms (student model, ICAI model, and multi-dimension education immune agent), some intelligent techniques are proposed and designed to teach Fuzzy Mathematics and Science of Artificial Immune System in a web-based way. The goal of the teaching methodology is a new learning, which is interactive, sharing, open, cooperative, and autonomous. The great difference between traditional approaches for teaching such knowledge and the new approach in this paper is the centre of teaching. The traditional teaching is centered with teachers but the new teaching is centered with students. The teaching system for Fuzzy Mathematics and Science of Artificial Immune System is a virtual classroom based on the web, and the two courses are designed as web-based courses. Moreover, for Science of Artificial Immune System, the web-based course system is a typical artificial immune system in fact, and students can learn more real knowledge from the web-based course immune system.

Abstract: Error-Tolerating Codes (ETC) is an important concept in the fields of reliability of computer. It is an efficient and economical approach, which uses few hardware, but improves the reliability of information in computer significantly. In this paper, some general Error-Tolerating Codes are presented and some examples will present to illustrate them.

Abstract: Virtual design is based on virtual reality and simulation technology, simulates the throughout life cycle from product design, manufacture, assembly, testing to use by means of three-dimensional software Inventor on computer in order to optimize product design quality and manufacturing processes, optimize production management and resource planning to achieve minimization of product development cycle and cost, optimization of product design quality and the highest productivity.

Abstract: The CAPP system architecture based on PDM was proposed to realize the integration of Information and function, which was built on the analysis for the processing characteristics of shaft parts of automatic machines. By proposing the multi-level parts feature information modeling and process feature information modeling, developing of automatic sequencing expert system for the shaft parts of automata, it typically realizes intelligent process planning, automatic confirming of cutting usages, automatic selection of technology resources and automatic calculation of cutting tools’ travel, working stroke and tool control parameters of CAM.