Applied Mechanics and Materials Vols. 117-119

Abstract: In order to improve the performance of SET protocol based on the original one, such as security and integrity of information, non-repudiation etc, a improved SET protocol is used in this paper. By introducing client wallet and server wallet, the improved SET protocol can rationally solve the conflicting decision analysis problem between the businesses and customers. The mobile payment based on the improved SET protocol has many features such as confidentiality, integrity, transaction atomicity and goods atomicity etc. Mobile payment based on SET protocol will be a very popular payment way in the future.

Abstract: Computational fluid dynamics (CFD) is an important applied research area of scientific computation visualization. Aiming at the difficult for three-dimensional display in the post-processing of wrap-around fins’ flowfield with commercial CFD software, the visualization techniques of CFD were investigated. And a visualization program was compiled using by powerful graphic processing software of MATLAB. The results showed the visualization program can display three-dimension characteristic of pressure, temperature etc. on the surface of wrap-around fins accurately and visually.

Abstract: Acoustic radiation forces can be used to collect particles within microfluidic systems. The standard way of doing this is to excite a one-dimensional standing wave between a pair of solid walls; the particles will then typically collect at the pressure nodes. Higher degrees of positioning control can be achieved by excitation of additional orthogonal one-dimensional standing waves; this usually requires further walled constraints (two-dimensional collection for example requiring a chamber rather than a channel). In this work we examine methods of exciting two-dimensional fields in a channel using a single transducer as well as the use of pressure fields which are not one-dimensional in nature and the advantages they can offer.

Abstract: Cermets become increasingly popular cutting insert in recent years. They are generally good when accuracy and finish are criteria for the operation. Several improvements have been made to increase their performance in machining process such as higher resistance to thermal deformation and lower conductivity than carbide tools that wear rapidly. This study is to investigate cutting force and tool wear under different rake angles in high speed machining process. Experiments were carried out by using cermet insert (CT5015). Different rake angles have been applied in the experiments which are 0o, -3o. -6o, -9o and -12o respectively with cutting speed 1000 m/minute and feed rate 800 mm/minute. For every single pass of cutting, cutting force, wear rate and cutting temperature were measured respectively by surface roughness tester, dynamometer, Scanning Electron Microscope (SEM) and infrared thermometer. The experimental results showed that the more negative angles the higher cutting force produced. Simultaneously, cutting temperature increases following the incremental of cutting force. It caused wear occurred faster and lead to reduce the life of cermet inserts.

Abstract: The use of Pro/E features a powerful solid modeling and ANSYS finite element analysis a powerful, integrated analysis of the two methods on the shelf for static analysis and modal analysis, obtained the stress, strain and natural frequency and the cloud vibration mode, the correct design of the shelf provides a reasonable theoretical basis. Checking the strength of the shelf structure can shorten the shelf of the production cycle, reduce costs and improve shelf quality, has a certain value engineering practice.

Abstract: A numerical based study was conducted to further understanding of turbine tip leakage and flow mechanisms for squealer tip blade. Three blade geometry models with different tips are established. They are squealer tip blade, squealer tip with injection holes blade, squealer tip with injection and film cooling holes blade, separately. Coupled aerodynamic and heat transfer numerical simulation method is used to study blade tip flow and heat transfer based the whole blade computational model. The results show that tip coolant injection will perform a positive effect for the resisting tip leakage, and it will reduce the temperature of blade tip surface and squealer rim, greatly. Film cooling near tip can cool blade squealer rim effectively, but it brings extra total pressure loss.

Abstract: Physical and numerical model studies were performed in order to study the flow conditions for the proposed pump station of Shuangwangcheng reservoir, Shouguang Ctiy. The flow velocity and the pressure distribution in the bidirectional culvert of Shuangwangcheng Pump Station had been obtained by hydraulic model test and numerical simulation. The physical model was constructed to a Froude scale of 1:20. A general conclusion was that, the computed results were good agreement with the data measured in physical model, and could be good complement for physical model test. Furthermore, negative pressure existing in discharge steep culvert in the initial scheme design was eliminated by moving the culvert controlling gate to the end of culvert in the modified scheme, and the flow conditions was improved.

Abstract: Abstract: This investigation develops a novel method for fabricating silver chloride films by the heterogeneous precipitation of sodium chloride from aqueous solution and supersaturated solid-state silver nitrate out of aqueous solution. The morphology of the bottom surface of the silver chloride film thus obtained comprises numerous porous stick structures. The top surface comprises equiaxed grains, and columnar grains are observed in the cross-section.

Abstract: In this paper, the pre-tightening force on piezoelectric multi-dimensional force sensor is researched. Structure of multi-dimensional force sensor and piezoelectric quartz crystals are introduced and analyzed. The relationship between pre-tightening force and measuring range of force sensor is researched. Structural model of multi-dimensional force sensor is built and analyzed by FEM. Horizontal linearity in horizontal direction with different preloads is obtained. In order to verify FEM analysis, a reduced prototype of piezoelectric multi-dimensional force sensor is fabricated. Verification test is designed and made. The research will provide certain reference value for development of piezoelectric multi-dimensional force sensor.

Abstract: The mathematical model of ship maneuvering is the core of the ship maneuvering off-line simulation system, it establishes three degrees of freedom motion control equation of the rigid body dynamics , in which the ship as a rigid body. Using MMG (Ship Maneuvering Mathematical Model Group) detached method, it considers the role of force and torque as well as the three mutual influences of hull, propeller and rudder respectively, than it applies runge-kutta method to solve differential equations and combine them with matlab programming languages. According to the rotation test and Z-style test of the kiloton ship, the ship maneuvering offline simulation system is proved to be correct and reliable. So we use this system to simulate the movement of ship passing through the continuous meandering bend in different situations. Then, we analyze rudder angle, drift angle and channel width of ship traveling through the continuous meandering bend, and we can find that when the length of transition section is less than 160m, the rudder angle and drift angle which ship is sailing across the after bend are obviously bigger than that of front bend; when the length of transition section increase a certain length, navigational parameter of front bend and after bend are basically the same, however, when it continues to increase, navigational parameter of front bend and after bend will not change and it will remain steady. Then, we define that the length is the critical navigation length of transition section. At the same time, we also can find that the minimum navigable length of transition section increase with the central angle of bend increase, and it will decrease with bending radius increase. When the central angle of bend is more than or equal to ninety degrees, the standard formula results must be certain modified.