Based on the mesoscopic finite element model of particle reinforced composites, the effects of stochastic properties of SiC particles on the ratcheting behavior of SiCP/6061Al composites were numerically analyzed by e...
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Based on the mesoscopic finite element model of particle reinforced composites, the effects of stochastic properties of SiC particles on the ratcheting behavior of SiCP/6061Al composites were numerically analyzed by employing a 3D multi-particulate unit cell and using an advanced cyclic plastic constitutive model. In the simulation, a 3D multi-particle unit cell containing the stochastic particle properties was first generated by the random sequential adsorption (RSA) method, and then the effects of the number of particles, the particle arrangement, shape, size and their stochastic distributions on the ratcheting of the composites were discussed by the numerical simulations. The results show that the smaller the particulate size and the higher the proportion of the particles distributing near the surface of matrix as well as the more the number of particulates contained in the unit cell, the higher the resistance to the ratcheting deformation. Meanwhile, the modeled composite with uniform distribution of particle size and location presents higher resistance to the ratcheting deformation than that with random distribution. The assumptions of spherical particle and its uniform distributions in size and location in the 3D unit cell can provide a reasonable simulation to the ratcheting of the particle reinforced metal matrix composites.
A theoretical analysis model was developed for area contact friction pairs with different micro- Textures considering cavitation within the fluid film between two faces. Numerical simulation method was used to study t...
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The direction of each individual velocity vector is very useful information for search in Artificial Physics Optimization (APO) algorithm. APO's simple way to dealing with the errant individual exceeded the lower ...
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In this paper, we provide a generalized file replication scheme with a storage load balancing function in unstructured P2P file-sharing networks. The generalized file replication scheme is expressed as a weighted mixt...
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Based on the present MODE-G control strategy, an improved new core control strategy is developed for the initial cycle utilizing gadolinium burnable poisons. With the relaxed axial offset control (RAOC) procedure to l...
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Based on the present MODE-G control strategy, an improved new core control strategy is developed for the initial cycle utilizing gadolinium burnable poisons. With the relaxed axial offset control (RAOC) procedure to limit the core axial offset (AO) in a band region, load follow operations are simulated under the improved core control strategy and the simulation results are compared with those obtained using MODE-G control strategy. Additionally, a preliminary evaluation of the impact of the an ejected rod with the improved core control strategy is performed. It is shown that the improved core control strategy can control the core axial power distribution more satisfactorily and effectively.
A new hexagonal fuel assembly(FA) design which has two rows of fuel rods between the hexagonal moderator channels is proposed for the thermal supercritical water cooled reactor(SCWR). The two-row hexagonal fuel assemb...
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A new hexagonal fuel assembly(FA) design which has two rows of fuel rods between the hexagonal moderator channels is proposed for the thermal supercritical water cooled reactor(SCWR). The two-row hexagonal fuel assembly concept is first and foremost considered for the performance of uniform moderation and sufficient moderation, and with the respect of structural performance and thermal-hydraulic performance. The physical performance of the two-row hexagonal FA with acceptable configuration is investigated. The results show clearly that a better balance between uniform moderation and sufficient moderation can be obtained in the two-row hexagonal fuel assembly. The design objective of the local power peaking factor less than 1.10 can be achieved under the condition of using the same enrichment fuel and containing no burnable poison.
Although biometrics technology has progressed substantially, its performance is still to be improved for real applications. This paper aims to improve the accuracy of personal identification, when only single sample i...
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This paper introduces a new control scheme for active steering of vehicle. An ideal reference model followed by the four-wheel steering (4WS) vehicle is established resulting from the front-wheel steering (FWS) vehicl...
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ISBN:
(纸本)9781424451920
This paper introduces a new control scheme for active steering of vehicle. An ideal reference model followed by the four-wheel steering (4WS) vehicle is established resulting from the front-wheel steering (FWS) vehicle, and an H ∞ optimum controller for the 4WS vehicle is designed based on model following technology. The dynamic simulation is performed to verify control effect of the H ∞ controller, and the result shows that the H ∞ controller can apply to the 4WS vehicle system. It can not only minimize the sideslip angle of the 4WS vehicle to zero value, but also keep the yaw rate of the 4WS vehicle in accordance with the FWS vehicle. The handleability is further improved for 4WS vehicle.
This paper dissertates the function of Virtual Reality technology in the product development process, and discusses the advantage in building virtual reality designsystem with the PTC DIVISION Mockup software. The fo...
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This paper dissertates the function of Virtual Reality technology in the product development process, and discusses the advantage in building virtual reality designsystem with the PTC DIVISION Mockup software. The four key technology projects of building Virtual Reality designsystem are explained simultaneously. In the virtual reality environment that is built with DIVISION Mockup Software, the virtual prototype of the Tunnel Boring Machinery is established and movement simulation is completed.
At present, the information and control system (I&C) and operation support system (OSS) of the nuclear power plants (NPPs) are designed separately; their structures and functions are independent. So, the compatibi...
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ISBN:
(纸本)9781424479573
At present, the information and control system (I&C) and operation support system (OSS) of the nuclear power plants (NPPs) are designed separately; their structures and functions are independent. So, the compatibility, availability and dependability of them are not desirable, and the comprehensive advantages of them are not to exert fully. In order to resolve these problems, this paper presents a new idea that designing and developing the I&C and the OSS coordinately, so that their structures and functions are integrated. Firstly, this paper reviewed the evolution and application status of the OSS. And then, the realization methods and forms for the integrated system are analyzed. At last, the hierarchy and architecture of the integrated system which have the double-functions of the I&C and OSS is founded. Analysis and study is also carried out in terms of the hierarchy and characteristics of the integrated system.
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