Cutting parameters play an essential role in the economics of machining. In this paper, particle swarm optimization (PSO), a novel algorithm for cutting (CPO), was discussed comprehensively. First, fundamental principle PSO introduced; then, application developed; thirdly, experiments without and with optimized were conducted to demonstrate effectiveness optimization, respectively. The results show that machining process improved obviously.

To improve low lapping efficiency of silicon nitride balls in conventional process, fixed abrasive technology for ceramic is investigated this paper. Diamond abrasives and photosensitive resin are used to fabricate the plate. The lapped ball surface observed with microscopy identify dominant wear mechanism. results show that material removal rate about 20 times free roughness close one. experimental indicate a promising process instead rough semi-finishing process.

In order to optimize static performance of a new orifices compensated externally pressurized gas spherical bearing, the paper presents theoretical study using finite element method (FEM). Galerkin weighted residual is applied reduce derivatives transformed Reynolds equation. On basis analysis, influence supplying pressure and geometrical parameters radial load carrying capacity stiffness was analyzed. As result, reasonable range bearing’s proposed.

Bonnet tool polishing is a novel aspherical method. This paper describes method to obtain the local removal rate for process using bulbous flexible membrane covered with pad and pressurized by an internal fluid. According principle of bonnet Preston equation, model was established. It confirmed experiments that depth has linear relation dwell time. coefficient can be calculated from experimental data. Finally expression in acquired semi-empirically.

In order to make the operator freely walk in virtual environment (VE), a new prototype of VE system for assembly is presented this paper. system, special machine designed and it enables inside any directions over long distance without actually leaving physical device. Images produced by computer are projected upon surface large spherical cap screen surrounding means group high power projectors. Signals provided position sensors attached used update images, which provides illusion walking...

Motorized spindle is one of the core parts high-speed machine tool, to a great extent, its thermal characteristics determine stress and deformations, therefore research on significance increase accuracy tool. In this paper, heat generation developed in built-in motor bearings calculated. The motorized modeled analysis by finite element method done using ANSYS software, foundation analyzing configuration transfer. variation regularity temperature-rise temperature field also summarized....

Particle reinforced metal matrix composites (SiCp/Al composites) have proved to be extremely difficult machine with traditional cutting processes due serious tool-wear and high machining cost, which lead the low efficiency. This paper presents results of an experimental research on mill-grinding SiC particle aluminum composites. Based Taguchi design method, study material removal rate was carried out gain optimal processing parameters combination by using analysis S/N ratio. The detailed...

This paper presents a simulation study of an H-type vertical axis wind turbine. Two dimensional CFD model using sliding mesh technique was generated to help understand aerodynamics performance this The effect the pith angle on turbine studied based computational model. As result, could get maximum power coefficient when pitch adjusted suited angle, furthermore, effects and azimuth single blade were investigated. results will provide theoretical supports variable

To understand the mechanism involved in lapping process of silicon nitride balls, wear mode is investigated this paper. The abrasion tests were performed on a ball-plate test apparatus with different loads (0~2N/ball) and slurry concentrations (5%wt~30%wt W20 B4C3). abraded surface observed by optical telescope. A wear-mode map, which defines regimes for two-body or three-body dominating micro-scale test, plotted two axes: load concentration abrasive. An empirical formula transition adopted...

Static and dynamic characteristic of carbon nanotube is analyzed by molecular simulation. analysis show that maximum deflection appears at 0.033nm distance from free end cantilever. When the value driving voltage less, flexibility more important, then stiffness increase with increasing, collapse structure or hole appear on nanobute. Under low pressure condition, difference equi-increase between no damping simulation larger than high pressure. The results forced vibration indicate system...

Due to the worldwide competition of manufacturing industry and development virtual reality (VR) technology, assembly (VA) has attracted many researchers reduce cost improve product quality. As a typical application VR in engineering, VA become increasingly important for modern industry. In this paper, survey research progress about is analyzed. The conception architecture are introduced at first, classification also presented, then main contents key techniques discussed, finally limitations...

With the construction of power Internet Things, network scale is constantly expanding, structure increasingly complex, and number terminals increasing rapidly, resulting in huge pressure on security protection, it urgent to build a credible operation environment ensure that Things runs safely reliably. This paper proposes architecture combining trusted computing blockchain. The ensures credibility terminal based remote integrity verification access control policy verification. A method for...

A new type of embedded streaming media client is designed in this paper. It takes the ARM processor and Linux operating system as platform, develops an player which broadcasts real time on through RTP/RTSP extensions transplantation original Mplayer. This not only inherits advantages Mplayer such supporting multiple formats extensive post-processing filters, but also carries out smoothly even Samsung S3C2410 board whose main frequency 200M. What's more, video runs like floating clouds...

Duck wave energy converter has the advantages of high conversion efficiency, simple construction, low cost relative to other power device. In paper, numerical simulation response was calculated by AQWA software which based on three dimensional potential flow theories. The results show that pitch angle appear peak when incident frequency is 1rad/s and maximum come out as linear normally duck body, means can absorb more in this angular frequency. above research provide reference for design converter.

PC-based software computer numerical control (CNC) system is the ideal for open CNC system, but there are some problems about current such as limitation of interpolation cycle, demanding on high-speed and high precision machining operation (OS). So advances a novel architecture compiled-type in architecture, general Windows adopted platform adopts two huge memories acting data buffer to solve real time problem. And then analyzes structure basic principle compiling system. The hardware has...

Three dimension indenter model was established to replace the ideal shape in study of nano-indentation simulation. The limitation short comparing actual condition can be solved. Single crystal aluminum surface on arc is researched by molecular dynamic influences different radius head testing results are discussed and compared experiment results. show that measured hardness value increases with same indentation depth condition. With increase depth, difference between changed reduces...

In this paper, we consider a multi-relay cooperative communication network that consists of source node transmitting to its destination with the help multiple decode-and-forward (DF) relays. Specifically, DF relays succeed in decoding signal are allowed re-transmit their decoded results simultaneously beamforming manner. order carry out beamforming, needs send quantized channel state information (CSI) through limited feedback face quantization errors (CQE). We propose CQE oriented (MRB)...

High speed machining is a promising technology for significantly increasing productivity and reducing production costs. Development of high-speed spindle strategically critical to the implementation high machining. Compared conventional spindles, motorized spindles are equipped with built-in motors better power transmission balance achieve operation. However, motor introduces additional mass shaft, besides, since its very working speed, some rotational effects, including centrifugal forces...

As the development of technology node, ULK was used as isolation material in Cu damascene integration. is a porous with low mechanical strength and adhesion. During CMP process, slurry additive moisture will enter hole result increasing K value, also film easily damaged by force. To solve this problem, capping layer designed In paper, novel barrier developed to meet integration need. Slurry chemistry/additives effect on RR selectivity topo evaluated paper.