Applied Mechanics and Materials Vols. 249-250

Abstract: Linkage of the three-dimensional parametric design system established through SolidWorks and the secondary development of the CAD with the needs of enterprise. In this system, users can carry out the parametric design modeling of the connecting rod, virtual assembly and generate engineering drawings, such as design work, and to carry out the simulation connecting rod and piston. The system helps users to achieve the optimization design of the connecting rod, thus saving the cost of product development. The system has marketing value because of the decreased of connecting rod design cycle.

Abstract: Numerical simulation has been carried out on the wake flow structure of some simplified antenna model which is shaped as a non-equal diameter slender cylinder. The unsteady flow parameter-Strouhal number is confirmed to be a constant approximately in the subcritical state. The results show that at levels of different diameters, when the length-diameter ratio is large enough, each level can still maintain stable periodical vortex shedding phenomenon, the vortex shedding frequency of each level, the flow velocity and the equivalent diameter still meet the Strouhal relationship. The effect of connect transition area on vortex shedding stabilize region are close to the freestream velocity.

Abstract: Many capital-intensive industries such as iron and steel, energy, refining, petrochemical and manufacturing companies have the pressure of continuous increase in maintenance costs. In recent years, condition based maintenance becomes an important tool for reducing maintenance costs in these industries. It is a very information intensive domain. Good condition based maintenance systems need to integrate multiple heterogeneous data sources. In this paper, we will use ontology to describe the semantics of condition based maintenance concepts. It serves two main purposes: (1) offering a common understanding of the condition based maintenance domain, and (2) the knowledge held in the ontology is machine-readable and explicit, thus making the knowledge easy to be processed and reused.

Abstract: This paper presents the design of a novel shape memory alloys (SMAs) damper, and its application in the vibration control of transmission towers. Firstly, based on a brief introduction for the essential properties of SMAs, a kind of constitutive model, i.e., the Brinson model is established to describe the unique behaviors of the material, combined with the experiments results. And then, a novel SMA damper, with the functions of displacement amplification and re-centering, is specifically designed by utilizing SMAs’ damping capacity. To verify and evaluate the device’s performance, the FEM model of an actual transmission tower is subsequently built in ANSYS, and by embedding the theoretical model of the damper into its analysis process, the responses of the tower subjected to the natural wind are numerically calculated. The results show that under the reasonable installations, the proposed SMA damper has a good effect on the wind-induced response control of the transmission tower.

Abstract: A 14 compound-driven MEMS-based optical device with optical switch and variable optical power attenuating functions has been proposed to optimally serve multifunctional optical fiber-based networking applications. The device manipulates the light with binary-slope mirrors driven by compound electrostatic actuator. The optical model for switching is investigated. Performances of the fabricated devices assembled with ball-lensed fibers are measured and discussed. Measurements reveal that the insertion loss of the device is less than 2.6 dB and the controllable attenuation range is more than 40 dB for the switching and attenuation function, respectively.

Abstract: The inverse problems are formulated for generalized Helmholtz equation describing propagation of acoustics waves in inhomogeneous anisotropic medium. These problems are connected with constructing nonscattering shells filled with anisotropic fluid. For solving the inverse problems we apply the nonlinear optimization techniques. Based on this approach we formulate the general control problem for the Helmholtz equation under consideration. The control problem consists of minimization of a suitable cost functional depending on the state (acoustic pressure) and unknown functions (controls). The optimality system for the general control problem is derived, the sufficient conditions for data which provide a local stability and uniqueness of control problems under study for concrete tracking-type cost functionals are discussed. The efficient numerical algorithm of solving control problem under study based on Newton's method of solving nonlinear equations and finite element for Helmholtz boundary value problems is proposed.

Abstract: Three-dimensional geological modeling techniques, developed from 1980s, is a new geological technology used to make reservoir fine description and geological characterization with the combination of seismic, geological and reservoir exploration and development based on geostatistics. Three-dimensional geological modeling can achieve the quantitative characterization of the reservoir and heterogeneity of various scales. So far, it has been the most important content of reservoir description, what’s more, three-dimensional structure modeling can improve the accuracy and reliability of fine reservoir description through the establishment of three-dimensional reservoir model, the quantitative distribution of three-dimensional reservoir parameters and geometry.

Abstract: The background of this paper is the power supply driven by High-voltage Static Synchronous Compensator series module, a kind of applicable to high voltage power module is proposed in this paper. Using High-voltage Static Synchronous Compensator, this device Switching Power Supply has the advantages of small in volume, light in weight, high efficiency and reliability. Compared with the high voltage of the insulation frequency transformer, this device overcoming many shortcomings, such as huge in volume and high price. This device is more suitable for distributed application, therefore it is very easy to realize multiple outputs of the power.

Abstract: Peristaltic pump is widely used in medical practice and chemical industry. But in some applications, which ask for small flow and high precision, a small jump of output to the peristaltic pump is quite serious. Therefore, it restricts the use and performance of peristaltic pump. This paper tries to introduce generalized predictive control method to the system of peristaltic pump. Besides, the results of simulation and experiment show that the static error of system using the mentioned method is smaller than traditional PID control which asks for a continuous output, so as to the output error when the system works at the small titration.

Abstract: Preliminary tests found that super-rice seeds could be oriented by rolling them down with a guided plate. The rotation of the seed around the shortest axis was found to be unstable, while rotation around another two axes was found to be stable. The purpose of the current study was to examine whether this orientation phenomenon could be explained in terms of inertial characteristics of seeds. According to the surface feature of the seeds, an ellipsoid geometrical model was made. Euler dynamical model were built to analysis the movement stability of the seeds. The effect of parameters on movement stability was analyzed by the method of numerical simulation.