Flexible graphite packing rings with different density have different compression performance. According to numerical and experimental methods, this paper studied the compression and resilience performance, stress tra...
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Flexible graphite packing rings with different density have different compression performance. According to numerical and experimental methods, this paper studied the compression and resilience performance, stress transfer characteristics and lateral pressure coefficients with different density from 1.30 g / cm 3 to 1.60 g / cm 3 under the assembly condition for the single graphite packing rings, thus compression characteristics of flexible graphite packing rings with different density can be obtained.
In order to investigate the fluid structure interaction problems occurring in tube bundles, a numerical model is presented. The unsteady three-dimensional Navier-Stokes equation and LES turbulence model are computed w...
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In order to investigate the fluid structure interaction problems occurring in tube bundles, a numerical model is presented. The unsteady three-dimensional Navier-Stokes equation and LES turbulence model are computed with finite volume approach on structured grids combined with the technique of dynamic mesh. The model presents a three dimensional fully coupled approach with solving the fluid flow and the structure vibration simultaneously, for the tube bundles in cross flows. The results show that, the presented model is validated with experimental data and compared with existing models in the literature. Trajectory of single tube is "8" shape at "locked in". The two parallel tubes oscillate in opposite phase and both have the same amplitude. For pitch higher than 1.5D, there is no mutual influence of the tubes and response is close to the case of single tube. The lift force and amplitude of downstream tube of two inline tubes are increasing as the pitch increases. The upstream tube is almost not influenced by the downstream one when the pitch is larger than 2D. The fluid force and response are close to the case of single tube.
Self-Powered Neutron Detectors (SPNDs), which are widely used in nuclear reactors to obtain core neutron flux distribution, are accurate at steady state but responds slowly to changes in neutron flux. Dynamic compensa...
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In China,the development and application goals of Small Modular reactor(SMR) aim at electricity generation area,heat supply area,and seawater desalination area,*** main technical features of the SMR areas follows:inte...
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In China,the development and application goals of Small Modular reactor(SMR) aim at electricity generation area,heat supply area,and seawater desalination area,*** main technical features of the SMR areas follows:integrated pressurized water reactor,reactor coolant pump and reactor pressure vessel connected by short pipe,steam generator sets in reactor pressure vessel,control rod drive mechanism(CRDM),pressure vessel,reactor internals,Once-Through Steam Generator(OTSG),and canned motor pump are all mature *** on the characteristic of the reactor and OTSG,the automatic control design of the SMR is discussed in this paper,and the simulation results are presented to illustrate the control scheme.
In order to change the poor adaptability and low efficiency of the message router in enterprise service bus, this paper proposed a natural language processing based semantic-level message routing algorithm and design ...
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Magneto-rheological elastomers (MREs) are a new kind of Magneto-rheological materials mainly composed of polymer rubber and micro-sized magnetizable iron particles. In this technical note, a shear-mode semi-active dyn...
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ISBN:
(纸本)9781634392389
Magneto-rheological elastomers (MREs) are a new kind of Magneto-rheological materials mainly composed of polymer rubber and micro-sized magnetizable iron particles. In this technical note, a shear-mode semi-active dynamic vibration absorber (SDVA) based on MREs is proposed and the dynamic design principle of an axial SDVA attached to ship shafting is studied. The material preparation of MREs and their properties under different magnetic fields are introduced. The structure of a single SDVA is designed. Furthermore, the natural frequencies of the single SDVA under different magnetic fields and temperatures are experimentally evaluated. It is found that the natural frequency of SDVA has a decreasing trend with the temperature increasing. However, it has an increasing trend with the excitation current increasing in the same temperature situation. The effect of temperature is more obvious than the excitation current.
design is the core of innovation activity, and it aims to establish better and comprehensive qualities of products. It is also a process to explore and enhance the human experience. During decades of exploration and p...
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