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For the world's first Offshore Floating Dock(OFD), the dimension control system and method to aim at managing the dimension of offshore blocks in the process of erection are developed. This paper introduces the dimension control system and deals with the method of creating a simplified OFD model and of optimizing ballast-water plan to satisfy the demanded dimension of erected offshore plant blocks...
In this paper, a systematic procedure is presented, how to predict the AC resistance of litz-wire windings considering air gap fringing fields. For this purpose, an equivalent complex permeability model is derived for hexagonally packed wires. It is shown, how finite element method (FEM) can be used to determine the real as well as the imaginary part of the complex permeability with the copper filling...
Single-polarization single-mode (SPSM) micro structured polymer optical fiber (MPOF) is designed based on polymethyl methacrylate (PMMA) . A full vector finite element method together with beam propagation method are adopted to study the properties of SPSM. By optimization designing, we found that only one polarization state of the fundamental mode can be transmitted within the visible light region...
To make the crank slider protective devices to meet the requirements of regulation, optimization was carried out to the absorbing thread of the crank-slider-CST protective device. Based on the finite element model in VPG and simulation in LS-DYNA, with the orthogonal optimization design, obtained the parameters of the absorbing thread. The crash speed in these simulations is 50km/h, which is higher...
As a consequence of increasing functional density and miniaturization in microelectronics new low-k and ultra-low-k materials are going to be increasingly used in Back-end of line (BEoL) layers of advanced CMOS technologies. These ongoing trends together with the transition to the use of TSVs for 3D-IC-integration cause novel challenges for reliability analysis and prediction of relevant electronics...
BIW modal optimization with traditional FEM method was inefficiency and usually with much mass increase. FEM analysis combined with Multi-objective Optimization method was used to improve the first order frequency of BIW. Mathematic model was built by response surface method to replace FEM model and NSGA-II was used to get non-dominated solutions. During the optimization plates with high relative...
This paper propose a decentralized coreless linear motor for aircraft launch system design. To obtain high efficiency in high speed process, this motor has a decentralized coreless stator that runs the entire length of travel, and a plate with an array of permanent magnets is used as the secondary. Transient analysis of electromagnetic field is analyzed by specialized electromagnetic finite element...
Based on illuminating the structure, working principle and force analysis of mobile electron radar, the finite element analysis of sheet metal shell is carried out on ANSYS Workbench (AWE) platform. First, the structure of sheet metal shell is simplified, then the 3D entity model and meshing model of sheet metal parts both are established. Secondly, the material attribute, contact type, load and constraints...
Taking an engineering design case about the dynamic model updating of long-span bridge under environment excitation, the three dynamic calculating models of the cable-stayed bridge are created by the finite element analysis program ANSYS, and the dynamic characteristics were analyzed, further by experimental results carried out on three models optimized amendment. The analysis results show that according...
A micro flexible gripper using piezoelectric actuator was produced. Design, fabrication and tests of the microgripper were performed. The geometric size of the microgripper was optimized. After modeling the micro-gripper, finite element method (FEM) was performed to investigate the flexible mechanism, and Based on the optimal results, a prototype of the microgripper was tested by experiment.
The finite element dynamic analysis model of the spindle assembly was developed based on thermoelasticity and finite element method. The force and the thermal value of spindle were calculated. The static and dynamic characteristics were analyzed. The modal, frequency, stress and displacement were obtained. The influence of spindle structure and parameters on spindle dynamic characteristics was discussed,...
In this paper, the shape identification method in the Inverse Heat Conduction Problems (IHCP) is applied to estimate the shape of frost on a refrigeration tube. The inverse algorithm consists of direct, inverse analysis and gradient-based optimization method. The direct analysis used Finite Element Method (FEM) in an unstructured grid system to solve the direct heat conduction problem. The inverse...
The leakage and diffusion accident of inflammable and explosive toxic gas has become a serious problem in the field of environment and security. Based on the optimized three-dimensional finite element model (FEM3) and the actual condition in complex and sealed space, a three-dimensional simulation system is developed to simulate the dynamic process of leakage and diffusion of gas in complex and sealed...
The present paper refers to some examples that use the finite element method (FEM) in the process of analysis, design and optimization of the electrical machines used in wind energy conversion systems. The 2D-FEM program Opera 13 of Vector Fields is used in the analyzed examples. These examples refer to two types of synchronous generators with permanent magnets. Some possibilities and advantages of...
MOSFETs in an RF amplifier dissipate high heat flux due to switching and conduction loss. MOSFET's junction temperature affects product reliability adversely. This paper presents a thermal management method used in an RF amplifier development with junction to case temperature rise transient analysis, Thermal Interface Material (TIM) testing, clamping structural Finite Element Analysis (FEA), and Computational...
The main target of this paper is optimizing the slot-opening shift for cogging torque reduction in BLDC motors. In a slot-opening shift method there is no skew, therefore the known drawbacks of the skewing is prevented. In the first part of the paper the slot-opening shift method for a BLDC motor is discussed. In this case, it is desired to find a method for cogging torque reduction without deteriorating...
In this paper various configurations of linear switched reluctance motor (LSRM) with permanent magnet (PM) are studied in order to obtain the high driving force construction. The 3-D Finite Element Method (FEM) is used to evaluate LSRM parameters. By comparing the maximum driving force the optimal construction has been determined. Its average driving force is increased 27%. The analysis presents that...
Taking multiple parameters of the main structural plates thicknesses and loads as random design variables, the strength reliability of bogie frame is analyzed based on response surface optimization approach and JC method. The response surface optimization approach is used to search the failure points of the structure limit state. Meanwhile, the sensitivity of structure reliability is also analyzed...
The high-pressure sheet metal forming of tailor rolled blanks allows the production of optimized components specially developed for their future function, which cannot be made from conventionally rolled sheet metal. The research aims at showing that the two processes, i.e. flexible rolling and high-pressure sheet metal forming, can be well represented in finite element simulations. By linking the...
WASP-NET's hybrid CAD approach - based on about thirty years of fundamental research in computational electromagnetics (EM) - comprises mode-matching (MM) / finite-element (FE) / method-of-moment (MoM) / finite-difference (FD) techniques, and, hence, fully exploits the specific efficiency and accuracy advantages of all involved basic EM methods. Recent advances include a fast hybrid finite-element...
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