CAEP - China Academy of Engineering Physics

Mianyang, China

CAEP - China Academy of Engineering Physics

Mianyang, China
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Fan Z.G.,CAEP - China Academy of Engineering Physics
Material Science and Engineering - Proceedings of the 3rd Annual International Conference on Material Science and Engineering, ICMSE 2015 | Year: 2016

Open-cell foams have excellent mechanical and physical properties and are widely used in structural components, energy adsorption, heat transfer, sound insulation, and so on. When their in-service temperature is high, time dependent creep may become significant. By taking the mass at strut nodes into account, and based on the three dimensional Voronoi models and finite element method, the creep deformations of metal foams having fractured cell-walls morphological imperfection are calculated. Numerical results show that the morphological imperfection has a significant effect on foam creep performance; with the increasing of the fraction of struts broken, the secondary foam creep rates increase rapidly. © 2016 Taylor & Francis Group, London.


Ji T.,CAEP - China Academy of Engineering Physics
21st AIAA International Space Planes and Hypersonics Technologies Conference, Hypersonics 2017 | Year: 2017

During reentry or long time high-speed flight, hypersonic vehicles suffer both aerodynamic heating and mechanical load which requires integrated thermal protection system (ITPS) to protect. To reduce the effect of the heat short and take full advantage of the potential of the material, some lightening holes are dug in the webs of the conventional corrugated-core sandwich panels. One unit cell of the developed corrugated-core sandwich panels is chosen as the design object, the situation with and without lightening holes and different structural materials are compared, respectively. Some geometric parameters of developed structure are considered as the design variables and their effects on the structure response are analyzed. It is found that with the holes being dug in the webs, the stress of the loading bearing structure increases. After optimization for three significant parameters, the weight of the final design is reduced by 16.6% compared to the conventional model. © 2017, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.


Peng X.,China Academy of Engineering Physics | Wang Z.,CAEP - China Academy of Engineering Physics
Qiangjiguang Yu Lizishu/High Power Laser and Particle Beams | Year: 2014

The Z-pinch driven fusion-fission hybrid reactor (Z-FFR) concept, proposed by CAEP, utilizes high-energy neutrons produced by Z-pinch driven inertial confinement fusion (ICF) to drive the sub-critical fission reactor for energy release. The Z-FFR innovative concepts such as local-holistic-ignition fusion target and advanced sub-critical power reactor, and it has advantages in security, economy and environment, and might promisingly be a millennial energy source which could effectively solve the climate problem and deal with the energy crisis. This paper introduces the current status of the conceptual research on Z-FFR in CAEP. The principle, structure and operation characteristics of the energy system are expounded in three aspects, the fusion-target design, the low-repetitive Z-pinch driver and the sub-critical fission reactor. The costs of the system are estimated, and the future developmental roadmap is put forward.


Wang H.,CAEP - China Academy of Engineering Physics | Wang H.,Zuse Institute Berlin | Agarwal A.,Free University of Berlin
European Physical Journal: Special Topics | Year: 2015

In this paper, we investigate the equilibrium statistical properties of both the force and potential interpolations of adaptive resolution simulation (AdResS) under the theoretical framework of grand-canonical like AdResS (GC-AdResS). The thermodynamic relations between the higher and lower resolutions are derived by considering the absence of fundamental conservation laws in mechanics for both branches of AdResS. In order to investigate the applicability of AdResS method in studying the properties beyond the equilibrium, we demonstrate the accuracy of AdResS in computing the dynamical properties in two numerical examples: The velocity auto-correlation of pure water and the conformational relaxation of alanine dipeptide dissolved in water. Theoretical and technical open questions of the AdResS method are discussed in the end of the paper. © 2015, EDP Sciences and Springer.


Wang Y.,CAEP - China Academy of Engineering Physics
Qiangjiguang Yu Lizishu/High Power Laser and Particle Beams | Year: 2013

The interaction physics between energetic particle and plasma are introduced. The energy loss and energy needed by single particle and pass through time on energetic C, Si, Ar, Au and U in equimolar DT plasma at 1000 g/cm3 in density and 50 μm in diameter and room temperature were calculated by Monte Carlo method. The feasibility of ICF ignition by swift heavy ions irradiation were proved. In theory, heavier ion mass ensures better ICF ignition. The heavy ions beam intensity and single ion energy needed by ignition are about MA and over GeV, respectively. The duration is several picoseconds.


Cao Y.,CAEP - China Academy of Engineering Physics
Qiangjiguang Yu Lizishu/High Power Laser and Particle Beams | Year: 2013

The optimized design method based on signal to noise ratio of the image is presented for the object of two-dimensional Gaussian distribution based on the theoretical analysis of the technology of X-ray in-line phase contrast imaging. The imaging systems under the radiation of sub-micrometer focus X-ray source, laser-based micrometer focus X-ray source and synchrotron radiation X-ray source are optimized by means of numerical simulation. The outcome shows that the method based on signal to noise ratio can increase the signal to noise ratio of the image and get more reasonable imaging distance premised by decreasing the contrast slightly when compared with the contrast method.


Liang Z.,CAEP - China Academy of Engineering Physics
Lecture Notes in Electrical Engineering | Year: 2016

This paper focuses on the mechanical model uncertainty quantification when the system parameters are in the form of probability box; for example, when the probability distribution of the system variable is specified by interval parameters, the variable is in the form of probability box. We develop an improved outer discretization method (IODM) for constructing random sets which provides a convenient mechanism for representing probability box. The method can increase the fineness of the random set’s approximation to the bounds of the probability box with a limited focal element. It is shown that the method is helpful for the uncertainty quantification when the model is computationally expensive. © Springer-Verlag Berlin Heidelberg 2016.


Gao Y.,CAEP - China Academy of Engineering Physics
Qiangjiguang Yu Lizishu/High Power Laser and Particle Beams | Year: 2015

The counter-Meshing Gears (CMG) mechanism is a discrimination mechanism which can be used in combination locks for high-consequence system surety. For an arbitrary binary Unlocking Symbol Sequence composed of equal number symbols of A and B, i.e. NA+NB, how to realize the binary discrimination teeth coding of its corresponding CMG mechanism with minimum fixed gear levels C and gear divisions D, is an important practical problem which is firstly well defined as the Optimal Normalizing CMG Coding Problem. With the toolbox comprising previously reported terms and methods, e.g. the CMG classification method, the 2-D Maze Map and the 3-color circular alternant coloring method for Critical Trap Grids (CTGs), optimal normalizing coding theory and methods for CMG Mechanisms are systematically discussed. Two optional coding methods, and their minimum requirement for the coding space (characterized with C×D) and coding algorithm, are all presented. A Figure of Merit (FoM) which characterizes the CMG coding efficiency is defined on the coding space and the symbol length of the Unlocking Symbol Sequence which dedicated for. By the FoM with clear physical meanings, the two optional Optimal Normalizing CMG Coding methods are compared, and it is concluded that the first type CMG mechanism with a coding space of C=3 and D=N+2 is the preferred method. As to the first type CMG mechanism, there is no difference between the Optimal Normalizing Coding, the previously reported Optimized coding with minimum gear levels, thus the minimum coding space of C=3 and D=N+2 are both needed and the 3-color circular alternant CTGs coloring method is a suitable coding method for both two. With application of the 3-color circular alternant CTGs coloring method, a distinct fingerprint feature can be revealed in the 2-D verification maze map that all CTGs are circular regularly allotted to only three color sets, i.e. the predesigned gear-teeth meshing between the two coupled composite gear A and B for error-locking function will alternately happen in only three discrimination gear levels. ©, 2015, Editorial Office of High Power Laser and Particle Beams. All right reserved.


Zhang L.,CAEP - China Academy of Engineering Physics | Du K.,CAEP - China Academy of Engineering Physics
Qiangjiguang Yu Lizishu/High Power Laser and Particle Beams | Year: 2013

Targets are physical base of the laser inertial confinement fusion (ICF) researches. The quality of the targets has extremely important influences on the reliabilities and degree of precision of the ICF experimental results. The characteristics of the ICF targets, such as complexity and microscale, high precision, determine that the target fabrication process must be a system engineering. This paper presents progresses on the fabrication technologies of ICF targets. The existing problem and the future needs of ICF target fabrication technologies are also discussed.


Wang Y.,CAEP - China Academy of Engineering Physics
Qiangjiguang Yu Lizishu/High Power Laser and Particle Beams | Year: 2012

The interaction physics between energetic particle and plasma are introduced. The energy loss, range and pass-through time of energetic electron, proton, D, T or He in pure D plasma of 500 g/cm 3 in density and 50 μm in diameter at room temperature or 10 keV were calculated by Monte-Carlo method. The results show that, for electron, proton, D, T or He beam, the lowest beam intensity needed for edge(center) igniting is 363(458), 187(355), 13.1(24.8), 10.9(20.9) or 9.34(17.0) MA, respectively; the longest time for single particle to pass through plasma is 0.036(0.078), 0.219(0.569), 0.241(0.651), 0.320(0.854) or 0.228(0.592) ps, respectively. All the time above is below the fuel confinement time. Because of the Bragg peak of energy loss curve or higher energy loss, the end of particle range should be located in the heating zone to improve the heating efficiency and lower the bunch intensity needed for ignition. The lowest energy for ignition should be realized by increasing bunch intensity.

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