Strong tie between cut-wire pair and continuous wire in combined-structure metamaterials

2011 ◽  
Vol 284 (4) ◽  
pp. 919-924 ◽  
Author(s):  
J.W. Park ◽  
N.T Tung ◽  
V.T.T. Thuy ◽  
V.D. Lam ◽  
Y.P. Lee
Keyword(s):  
Continuous Wire ◽  
Combined Structure

Updating Finite Element Model of Combined Structures on the Basis of Dynamic Test Results

1996 ◽  
Author(s):  
Chen Xin ◽  
Qin Ye ◽  
Yuan Xiguang ◽  
Zhang Ping ◽  
Sun Jian
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Test Data ◽  
Dynamic Test ◽  
Element Model ◽  
Physical Parameters ◽  
Structural Joint ◽  
Combined Structure ◽  
Joint Parameters ◽  
Two Stages

Abstract According to the real situation, a new method of updating the finite element model (FEM) of a combined structure step by step is proposed in this paper. It is assumed that there are two types of error when establishing the FEMs. One of them results from the simplifications, in fact, it is severe for complicated structures, which usually assume many simplifications; the other is from the process of identifying structural joint parameters. For this reason, it is recommended that the FEM should be established in two stages. At the first stage, the local physical parameters relating with the simplifications are corrected by using the dynamic test data of the corresponding substructures. Then, the structural joint parameters that link the substructures are corrected by the dynamic test data of the combined structure as a whole. The updating formula is presented and proved, and its algorithm is also described. And the experimental results show that the efficiency and accuracy of the proposed method are quite satisfactory.

Modern Rolling Mill Design

1937 ◽  
Vol 136 (1) ◽  
pp. 353-371
Author(s):  
A. Poole
Keyword(s):  
Rolling Mill ◽  
Steel Structures ◽  
Recent Experience ◽  
High Class ◽  
Continuous Wire ◽  
Small Hand ◽  
Steel Castings ◽  
High Production ◽  
Hot Rolling Mill ◽  
Modern Rolling

After surveying the various types of hot rolling mill units for heavy ingots and their evolution, the author selects for description certain examples of progressive design from his own recent experience. These include an adaptation of modern heavy mill manipulation to an existing blooming mill, incorporating fabricated steel structures in place of steel castings for mill tables, small hand-worked mills for the accurate finish of high-class steels in small bar sizes, a modern high-production four-strand continuous wire rod mill plant, and two examples of development in rolling mill auxiliaries. The question of roll neck bearings is discussed and a special bronze and white-metal combination roll neck bearing is described.

scholarly journals Hydrodynamic Response of a Combined Wind–Wave Marine Energy Structure

2020 ◽  
Vol 8 (4) ◽  
pp. 253 ◽  
Author(s):  
Yapo Wang ◽  
Lixian Zhang ◽  
Constantine Michailides ◽  
Ling Wan ◽  
Wei Shi
Keyword(s):  
Renewable Energy ◽  
Wave Energy ◽  
Offshore Wind ◽  
Hydrodynamic Performance ◽  
Energy Structure ◽  
Marine Energy ◽  
Floating Offshore Wind Turbines ◽  
Central Column ◽  
Combined Structure ◽  
Heave Motion

Due to the energy crisis and greenhouse effect, offshore renewable energy is attracting increasing attention worldwide. Various offshore renewable energy systems, such as floating offshore wind turbines (FOWTs), and wave energy converters (WECs), have been proposed and developed so far. To increase power output and reduce related costs, a combined marine energy structure using FOWT and WEC technologies has been designed, analyzed and presented in the present paper. The energy structure combines a 5-MW braceless semisubmersible FOWT and a heave-type WEC which is installed on the central column of the semisubmersible. Wave power is absorbed by a power take-off (PTO) system through the relative heave motion between the central column of the FOWT and the WEC. A numerical model has been developed and is used to determine rational size and draft of the combined structure. The effects of different PTO system parameters on the hydrodynamic performance and wave energy production of the WEC under typical wave conditions are investigated and a preliminary best value for the PTO’s damping coefficient is obtained. Additionally, the effects of viscous modeling used during the analysis and the hydrodynamic coupling on the response of the combined structure are studied.

scholarly journals Monte Carlo optimization simulation of neutron shielding performance of iron/polyethylene combined structure

2018 ◽  
Vol 189 ◽  
pp. 02001
Author(s):  
Yinghong Zuo ◽  
Jinhui Zhu ◽  
Shengli Niu ◽  
Honggang Xie ◽  
Peng Shang
Keyword(s):  
Monte Carlo ◽  
Neutron Source ◽  
Thickness Ratio ◽  
Optimal Thickness ◽  
Neutron Shielding ◽  
Monte Carlo Optimization ◽  
Optimization Simulation ◽  
Combined Structure ◽  
Shielding Design ◽  
Different Thickness

This study aims to get the optimization neutron shielding design of iron/polyethylene combined shield structure. The neutron transmission coefficient with various energies for different thickness of iron and polyethylene combined shield structure were calculated by using Monte Carlo method. The simulation results show that the optimization effect of iron/polyethylene combined shield is not obvious when the neutron energy is low or the shield is thin, there is an optimal thickness ratio of iron to polyethylene adopted to get the best neutron shielding performance when the energy of neutron source is above 2 MeV and the total thickness of combined shielding structure is more than 20 cm. The optimal thickness ratio of iron to polyethylene increases with the increasing energy of neutron source; with the increasing of neutron source energy ranging from 4 MeV to 14 MeV, the optimal thickness ratio of iron to polyethylene trends from 0.11 to nearly 1.6.

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