Underwater explosion approximate method research on ship with polymer coating

2016 ◽  
Vol 231 (2) ◽  
pp. 384-394
Author(s):  
Zhen-Hua Zhang ◽  
Yong Chen ◽  
Xiu-Chang Huang ◽  
Hong-Xing Hua
Keyword(s):  
Polymer Coating ◽  
Optimization Design ◽  
Underwater Explosion ◽  
Hard Core ◽  
Design Criterion ◽  
Soft Core ◽  
Homogenization Theory ◽  
Shock Load ◽  
Prime Design ◽  
Equivalent Continuum Model

Battle damage survivability is the prime design criterion of naval ships. Composites and hybrid structures such as polymer coating attract much attention to increase the ship survivability. Aiming to develop the parameter optimization design of the coating and to assess the underwater explosion shock environment and the blast-resistant effect of polymer coating efficiently, an approximate numerical method was performed in this preliminary study. An equivalent continuum model based on the homogenization theory was introduced to simulate the dynamic behavior of the coating. The test data of full-scale underwater explosion tests and the numerical simulation results were investigated. The blast-resistant property of the polymer coating was elaborated. The core strength had an important influence on the ship dynamic response: under low-intensity underwater explosion shock load, “soft” core had greater blast-resistant effect than the other ones, while under high-intensity underwater explosion shock load, “ordinary” core and “hard” core had better blast-resistant effect than the “soft” core.

From “hard-core” to “soft-core” ESP: A case study

1985 ◽  
Vol 4 (2) ◽  
pp. 101-109 ◽  
Author(s):  
Guillermo Latorre ◽  
M. Angélica Kaulen
Keyword(s):  
Hard Core ◽  
Soft Core

Time in Process Philosophy

KronoScope ◽  
2001 ◽  
Vol 1 (1) ◽  
pp. 75-99 ◽  
Author(s):  
David Ray Griffin
Keyword(s):  
Common Sense ◽  
Hard Core ◽  
Process Philosophy ◽  
Soft Core

AbstractAfter contrasting process philosophy's pantemporalism with the two other possibilities — nontemporalism and dualism — I argue the following points:The great negative virtue of J.T.Fraser's version of emergent dualism is that it explicitly brings out the paradoxes that must be faced if pantemporalism is denied. Its great positive virtue,especially when read in conjunction with Grünbaum's position, is that it brings out the fact that time (in the full-fledged sense) requires experience.These two virtues combined suggest the truth of both pantemporalism and panexperientialism, which are mutually implicatory.Pantemporalism, or even the weaker conviction, shared by almost everyone, that time has existed at least since the origin of our universe, conflicts with another belief that initially seems equally well grounded — the belief in an ontological dualism between experiencing and nonexperiencing things. But this latter conviction belongs at best only to soft-core, not hard-core, common sense, so it can be given up without selfcontradiction. Because panexperientialism, like pantemporalism, solves a host of philosophical problems, a pantemporalisticpanexperientialist worldview can be defended in terms of selfconsistency and adequacy to the facts, including the facts of hard-core common sense.

Structure Topology Optimization Design and Shock Resistance Study on Nuclear Power Safety DCS Cast Aluminum Cabinet

2020 ◽  
Author(s):  
Wang Dongwei ◽  
Liu Mingxing ◽  
Wu Xiao ◽  
Yan Hao ◽  
Wu Zhiqiang
Keyword(s):  
Topology Optimization ◽  
Power Plant ◽  
Nuclear Power Plant ◽  
Nuclear Power ◽  
Optimization Design ◽  
High Stress ◽  
Shock Load ◽  
Normal Operation ◽  
Cast Aluminum ◽  
Structure Topology

Abstract Offshore floating nuclear power plant (FNPP) is characterized by its small and mobility, which is not only able to provide safe and efficient electric energy to remote islands, but to the oil and gas platforms. The safety digital control system (DCS) cabinet, as a carrier for the electronic devices, plays a significant role in ensuring the normal operation of the nuclear power plant. To satisfy the requirements of cabinet used in the sea environment, such as well rigidity, shock load resistance, good seal and corrosion resistance, etc, more and more attention is focused on the cast aluminum cabinet. However, the cast aluminum structure may cause larger weight of cabinet, which inevitability affects the mobility of cabinet, and increases the carried load of ship as well. Therefore, seeking for an effective approach to design a light weight cast aluminum cabinet for the offshore FNPP is definitely necessary. In this work, a frame of cast aluminum cabinet with lightweight is obtained successfully via structure topology optimization design, it is found that the weight of the frame can be reduced to 50% after optimization iterations. Subsequently, the natural frequency of the optimized cast aluminum cabinet is calculated by using ABAQUS, it is seen that the first mode frequency of the frame is beyond 30 Hz, which can meet the basic stiffness requirement. Accordingly, dynamic design analysis method (DDAM) is performed to verify the ability of the optimized cast aluminum cabinet in resisting sudden shock load, and the shock response characteristics of the cabinet are determined. Numerical results support that the optimized frame of cabinet possesses good resistance to high level shock. However, for the assembled cast aluminum cabinet, the vertical shock circumstance turns out to be the most critical condition, high stress and deformation regions occurs at the bracket and column. Reinforcements are proposed to make the bracket stiffer in this shock loading condition.

scholarly journals Soft core thermodynamics from self-consistent hard core fluids

2006 ◽  
Vol 125 (16) ◽  
pp. 164503 ◽  
Author(s):  
Elisabeth Schöll-Paschinger ◽  
Albert Reiner
Keyword(s):  
Hard Core ◽  
Soft Core ◽  
Self Consistent

The effect of soft‐core and hard‐core erotica on provoked and unprovoked hostile behavior

1981 ◽  
Vol 17 (4) ◽  
pp. 319-343 ◽  
Author(s):  
Barry S. Sapolsky ◽  
Dolf Zillmann
Keyword(s):  
Hard Core ◽  
Soft Core

Percolation threshold of hard-sphere fluids in between the soft-core and hard-core limits

2006 ◽  
Vol 104 (20-21) ◽  
pp. 3137-3146 ◽  
Author(s):  
David M. Heyes ◽  
Michael Cass ◽  
Arkadiusz C. Brańka
Keyword(s):  
Percolation Threshold ◽  
Hard Sphere ◽  
Hard Core ◽  
Soft Core

MICROSCOPIC OPTICAL POTENTIAL FROM ARGONNE INTER-NUCLEON POTENTIALS

2011 ◽  
Vol 20 (11) ◽  
pp. 2317-2327 ◽  
Author(s):  
DIPTI PACHOURI ◽  
MANJARI SHARMA ◽  
SYED RAFI ◽  
W. HAIDER
Keyword(s):  
Binding Energy ◽  
Nuclear Matter ◽  
Optical Potential ◽  
Hard Core ◽  
Soft Core ◽  
Scattering Data ◽  
Test Case ◽  
Hartree Fock ◽  
Reaction Matrix ◽  
Microscopic Optical Potential

In the present work we describe our results concerning the calculation of equation of state of symmetric zero temperature nuclear matter and the microscopic optical potential using the soft-core Argonne inter-nucleon potentials in first order Brueckner–Hartree–Fock (BHF) theory. The nuclear matter saturates at a density 0.228 nucleon/fm 3 with 17.52 MeV binding energy per nucleon for Argonne av-14 and at 0.228 nucleon/fm 3 with 17.01 MeV binding energy per nucleon for Argonne av-18. As a test case we present an analysis of 65 and 200 MeV protons scattering from 208 Pb . The Argonne av-14 has been used for the first time to calculate nucleon optical potential in BHF and analyze the nucleon scattering data. We also compare our reaction matrix results with those using the old hard-core Hamada–Johnston and the soft-core Urbana uv-14 and Argonne av-18 inter-nucleon potentials. Our results indicate that the microscopic potential obtained using av-14 gives marginally better agreement with the experimental data than the other three Hamiltonians used in the present work.

Research on the Multi-Disciplinary Optimization Design Technology for the ETO Product

2011 ◽  
Vol 55-57 ◽  
pp. 1177-1182
Author(s):  
Miao Fen Zhu ◽  
Shao Hui Su ◽  
You Ping Gong ◽  
Guo Jin Chen
Keyword(s):  
Knowledge Management ◽  
Optimization Design ◽  
Simulation Optimization ◽  
Design Criterion ◽  
Hydraulic Lift ◽  
Knowledge Modeling ◽  
Knowledge Reasoning ◽  
Knowledge Expression ◽  
Custom Made ◽  
Optimization Function

This paper provides one kind of knowledge construction to let the engineers and technicians apply the knowledge to the product’s simulation optimization function, the ability of establishing the design criterion and the technical standard, and the convenient knowledge reuse tool to manage the knowledge effectively. In this paper the knowledge expression, the knowledge tool as well as the inference engine of the knowledge library is packed as the knowledge management module which is called for the design simulation optimization system of the outside products. The application frame of the knowledge module takes the knowledge management as a center, and form finally the knowledge management engine embedded in the design simulation system based on the unified multi-disciplinary modeling. Therefore, the knowledge management module is divided into the knowledge modeling, the knowledge expression, the knowledge reasoning, and the knowledge management. Aiming at the deep custom-made degree of the multi-functional hydraulic lift machinery, the complex restraint and coupling relations between the components and parts, the non-unified model descriptions between the multi-disciplines, and the difficult management of massive isomerous data, the basic frame of the multi-disciplinary configuration optimization design for the ETO product of the hydraulic lift machinery is proposed in the paper.

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