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郑津洋, J Zheng *, G Sun, Z Chen, P Xu, A Liu and Y Liu
,-0001,():
-1年11月30日
Considering the fact that the required thickness of a hemispherical head for pressure loading is only half of that necessary for a cylindrical shell, the authors have developed a proprietary junction of shell to hemispherical head where the head is thinner than the shell. In the past 5 years, more than 100 high-pressure vessels with such junctions have been manufactured and safely used in the People's Republic of China. Theoretical investigations as well as engineering applications show that such junctions are rational in structure, convenient in fabrication and low in cost. For example, for a vesscl with an inner diameter of 1000 mm and design pressurc of 31.4MPa, using thc new junction, the head weight is reduced by 54.3 and 27.4 per cent respectively in comparison with a forged fiat head and a hemispherical head with equal thickness of shell. The larger the vessel, the grcater the economic benefits it achieves, In this paper, the authors describe its basic structure, stress characteristics and the engineering design method for the unique junction.
high-pressure vessel,, reinforcing ring,, hemispherical head
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郑津洋, Bohou Xu a, b, *, Jianlong Li a, Fabing Duan a, Jinyang Zheng c
Chaos, Solitons and Fractals 16(2003)93-106,-0001,():
-1年11月30日
The stochastic resonance phenomenon is investigated in the presence of colored noise. The solutions of the signalto-noise ratio gain and the characteristic time are put forward. By means of tuning system parameters, the ability of a bistable system driven by colored noise to process a weak multi-frequency signal can be enhanced. It is found that the effects of the noise-correlation time on signal processing are not great. Furthermore, this method can be applied to sampling signal processing.
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【期刊论文】How to tune the system parameters to realize stochastic resonance
郑津洋, Bohou Xu, Jianlong Li and Jinyang Zheng
J. Phys. A: Math. Gen. 36(2003)11969-11980,-0001,():
-1年11月30日
The paper presents a numerical method of realizing stochastic resonance (SR) by tuning system parameters. Firstly, a simple and effective method of evaluating the system response speed λ1 is introduced. Then the parameterinduced SR problem can be reduced to the parameter optimization problem under the condition λ1=const. To solve this optimization problem, we put forward the following techniques: (i) compensate the deviation from the prescribed system response speed λ1 at each step, (ii) take the curve length increment on the parameter plane as the step size in searching the maximal signal-to-noise ratio (SNR) gain. Finally, a numerical simulation confirms the effectiveness of this method.
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【期刊论文】ELASTIC STRESS WAVES OF CYLINDRICAL RODS SUBJECTED TO RAPID ENERGY DEPOSITION
郑津洋, Jinyang Zhenga, Ping Xua, Qiang Fua, Rusi P.Taleyarkhanb, Seokho H. Kimb
,-0001,():
-1年11月30日
energy deposition into targets and beam absorbers in high-energy accelerator leads to temperature rise at an enormous rate, giving rise to thermally induced stress waves. Understanding and predicting resulting stresses are crucial for robust design and safe operation of such devices. In this paper, a closed form expressions for the induced stresses in cylindrical rods subjected to rapid partial energy deposition have been directly derived; it is then used to estimate highest stress of long cylindrical absorbers and to test the accuracy of thermal shock simulation with Finite Element Analysis (FEA) codes. Characteristics of such stresses were discussed in detail. It was found that ANSYS may produce accurate details in thermal shock simulation if element size and time step used in simulation model meet the criteria proposed by Zheng etc. in another paper.
stress wave, simulation, dynamic response, energy deposition
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【期刊论文】Forming mechanism of double-layered tubes by internal hydraulic expansion
郑津洋, Fujun Liua, *, Jinyang Zheng a, Ping Xu a, Mingze Xu b, Guohui Zhu a
International Journal of Pressure Vessels and Piping 81(2004)625-633,-0001,():
-1年11月30日
In this paper, the hydro-expanding principle for a double-layered tube is set out in detail. The force state of a double-layered tube was analyzed during the process of hydro-forming. The stress and strain for the inner and outer tubes were evaluated using theories of elasticity and plasticity. By using the relation of deformed compatibility of hoop strain, suitable conditions of hydraulic expansion and variable range of hydro-expanding pressure are given, and formulae of hydro-expanding pressure related to residual contact pressure are derived. The results are applicable to cases where the inner tube is both thin-walled and thick-walled.
Double-layered tube, Hydro-expanding pressure, Contact pressure, Residual contact pressure, Hoop strain
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