Applied Mechanics and Materials Vols. 190-191

Abstract: Accurate prediction of aquatic product prices can improve the quality of business strategy of aquatic product market. Case-based reasoning (CBR) systems have long been intensively used in several areas of artificial intelligence. But it is difficult to cluster similar cases from case bases as there are uncertainties in knowledge representation, attribute description and similarity measures in CBR. To increase the efficiency and reliability of CBR, fuzzy theories have been combined with CBR. In this paper, fuzzy case-based reasoning (FCBR) has been developed to forecast the price of aquatic products.

Abstract: In order to raise the design efficiency and get the most excellent design effect, this paper combined Particle Swarm Optimization (PSO) algorithm and put forward a new kind of neural network, based on PSO algorithm and NARMA model. It gives the basic theory, steps and algorithm; The test results show that rapid global convergence and reached the lesser mean square error MSE) when compared with Genetic Algorithm, Simulated Annealing Algorithm, the BP algorithm with momentum term.

Abstract: Tamper, the core equipment of tamping vehicle, is used to complete the work of maintenance and construction in the railway field. Based on international tamping technology and existing problems, a new type of electrohydraulic exciter applied on the tamper is proposed. It mainly consists of spin valve with high speed and micro-displacement double-functioned hydraulic cylinder. In this paper, AMESim Based Dynamic Modeling is carried out to early explore the relationship between operating frequency, axial conducting width of valve orifice and the displacement, velocity, acceleration, vibration force, load pressure, load flow rate. The results indicate that the new electrohydraulic exciter can meet the design requirement well and realize the flexible adjustment of amplitude and frequency through rotational speed control of step motor. Therefore, it adapts to different working environment including hardened ballast and loose ballast. This simulation can not only enrich relative researches of electrohydraulic exciter, but also provide theoretical foundation and practical direction for optimization of device design.

Abstract: This paper proposed an optimized algorithm for discretization of cutter location points on the laser cutting path of three-dimensional surface. The initial discretization step size was calculated due to the curvature of the curve on the starting point and accuracy requirements. A reference sphere was established by taking the initial discretization step size as the radius. The initial cutter location point was located on the intersection of the reference sphere and the processing path. The radius of reference sphere was dynamically adjusted by dichotomy according to string height difference in order to get the optimal cutter location on the path to be processed. This algorithm has a high computational efficiency. And an automatic programming software used for three-dimensional laser cutting was developed based on this algorithm.

Abstract: This paper proposes an ultrasonic knife system for MEMS packaging. The ultrasonic knife system is consisted of an ultrasonic transducer, a cutter and a gripper feeder. The ultrasonic transducer engenders high frequency vibration, which lead to the resonance of the structure. Amplitude transformer can magnify the amplitude. By the impact and collision of the cutter, the material can be cut through, and the high temperature created by high-frequency vibration can do the welding. The structure is designed and optimized by the finite element method, and a model machine is produced. According to the experimental results, the ultrasonic knife system has the virtues of high cutting force and better wedding feature, which are suitable for MEMS packaging.

Abstract: Through analyzed the current situation of a production workshop ,the author finds out some existent problems.To solve the problems ,designs the facilities layout by using the Systematic Layout Planning(SLP) methed combined with the actual situation workshop,so as to achieve the purpose that shorten logistics path, expand work area,material handling smoothly,and improve the production efficiency.

Abstract: Along with the development of manufacturing enterprise information deeply, production site visualization manufacturing technology is one of the key technologies of information construction, so it is concerned in many ways. Production site visualization manufacturing technology is an important technical problem that manufacturing enterprise must be faced and resolved in future. This paper started from the production site visualization of manufacturing technology, defined and built 3D process model, analysed the traditional the way of process information transferring and releasing, researched production site visualization manufacturing technology based on 3D process model, and expounded application example of the 3D process design.

Abstract: Introduced the theory of the Energy loss analysis and lots of Energy loss analysis methods and utilized the basic formula method to analysis the influence of some operation parameters of a foreign designed 300MW coal-fired power plant to coal consumption in the variety loads. Applied matlab to make a figure, which contained the influence of some operation parameters of a foreign designed 300MW coal-fired power plant to coal consumption in the variety loads. Compared analysis the results, and gained the energy saving direction, so it conducted the operation of these units and optimized it.

Abstract: Solid oxide fuel cell (SOFC) is one of most promising types of fuel cells with advantages of high efficiencies, flexible fuel types. As a device directly converting the free energy of chemical reactant to electrical energy and heat, the performance of SOFC is strongly affected by the chemical and electro-chemical reactions occurring in the porous anode coupled with mass, momentum and heat transfer processes. A 3D CFD model has been developed by using in-house code to analyze the various processes coupled with elementary surface reactions occurring in SOFC’s anode, to identify the effects between transfer processes and some elementary reactions occurring in the anode. It shows that single step elementary reaction can affect the distribution of surface species, but not remarkable on global conditions such as temperature and gas distribution. On the other hand, global parameters including temperature, porous characteristics affect the surface species distribution and elementary reaction processes largely.