Based on Iwan′s wake oscillator model developed with the classical van der Pol equation, the differential equation for the response of the vortex-induced vibration (VIV) of the riser considering the effect of the int...Based on Iwan′s wake oscillator model developed with the classical van der Pol equation, the differential equation for the response of the vortex-induced vibration (VIV) of the riser considering the effect of the internal flowing fluid and the external marine environmental condition is derived. The effect of the internal flowing fluid on the response of VIV of the riser is studied by means of the Finite Element Method. The results show that the effect of the internal fluid velocity on the VIV of the riser is strong when the natural frequency of the riser is close to the vortex shedding frequency. In addition, the increase of the top tension can decrease the sensitivity of the riser to the internal fluid velocity.展开更多
A new fluid bag buffer mechanism,which can provide large axial stiffness under the small displacement,is designed.The dynamic change laws of the mechanism stiffness and the internal pressure of the fluid bag are studi...A new fluid bag buffer mechanism,which can provide large axial stiffness under the small displacement,is designed.The dynamic change laws of the mechanism stiffness and the internal pressure of the fluid bag are studied when it is subjected to impact load.According to the protection performance for the flexible joint and the pressure change in the fluid bag during the impact process,the sensitivity of the geometric parameters of the fluid bag to the axial stiffness is analyzed by using the orthogonal experimental method,and the optimal parameter combination of the geometric parameters of the fluid bag under impact is obtained,leading to the displacement of the inner shell reduce by 41.4%.The results show that the internal pressure of the fluid bag is a rising process of oscillation and fluctuation.The sensitivity of the geometric parameters of the fluid bag to the displacement of the inner shell from high to low is as follows:Height H,radius r,wall thickness t,chamfer A.The correlation between the geometric parameters of the fluid bag and its internal pressure is:H is negatively correlated with the internal pressure,while the r,t,and A are positively correlated with the internal pressure.展开更多
Date: April 12-15, 2005 Venue: Zhejiang University, Hangzhou, P. R. China Organized by Institute of Mechatronic Control Engineering, Zhejiang University
Two-dimensional internal waves generated by a moving flat body in a continuous- ly stratified fluid are investigated by using three kinds of flow-visualization methods:electrolytic precipitation,hydrogen bubbles,and d...Two-dimensional internal waves generated by a moving flat body in a continuous- ly stratified fluid are investigated by using three kinds of flow-visualization methods:electrolytic precipitation,hydrogen bubbles,and dye streaks.Attentions are paid mainly to the generation and propagation process in the upstream region under low internal Froude number(1/10π<F_r<1/2π).The features of the upstream disturbances as well as their relationship with stratification number K (K=1/F_r) are illustrated.The corresponding theoretical analysis is briefly presented,and by comparison,the experimental and theoretical results agree well.展开更多
Editorial Advisory Board AUNG, Win U.S.A. BERGLES, Arthur E. U.S.A. CHEN,XueJun China DVORAK, Rudolf Czech GAL-OR, Ben Israel GALLUS, H.E. Germany GRUNDMANN, Roger Germany HUANG, Zhao Xiang China IVANOV, Michail Russi...Editorial Advisory Board AUNG, Win U.S.A. BERGLES, Arthur E. U.S.A. CHEN,XueJun China DVORAK, Rudolf Czech GAL-OR, Ben Israel GALLUS, H.E. Germany GRUNDMANN, Roger Germany HUANG, Zhao Xiang China IVANOV, Michail Russia LEFEBVRE, A.H. U.S.A. LEONTIEV, A.I. Russia MA, Chong-Fang China MA, Tong Ze China MARTYNENKO, O.G. Belorussia NAKORIAKOV, V.E. Russia RAUTENBERG, Manfred Germany SWITHENBANK, J. United Kingdom WANG, Bu Xuan China WENG, Shi Lie China WU, Cheng Kang China YE, Da Jun China ZIEREP, Jurgen展开更多
Editorial Advisory Board AUNG, Win U.S.A. BERGLES, Arthur E. U.S.A. CHEN, XueJun China DVORAK, Rudolf Czech GAL-OR, Ben Israel GALLUS, H.E. Germany GRUNDMANN, Roger Germany HUANG, Zhao Xiang China IVANOV, Michail Russ...Editorial Advisory Board AUNG, Win U.S.A. BERGLES, Arthur E. U.S.A. CHEN, XueJun China DVORAK, Rudolf Czech GAL-OR, Ben Israel GALLUS, H.E. Germany GRUNDMANN, Roger Germany HUANG, Zhao Xiang China IVANOV, Michail Russia LEFEBVRE, A.H. U.S.A. LEONTIEV, A.I. Russia MA, Chong-Fang China MA,TongZe China MARTYNENKO, O.G. Belorussia NAKORIAKOV, V.E. Russia RAUTENBERG, Manfred Germany SWITHENBANK, J. United Kingdom WANG,BuXuan China WENG, Shi Lie China WU, Cheng Kang China YE, Da Jun China ZIEREP, Jurgen展开更多
Journal of Thermal Science, a quarterly English language journal run by the Institute of Engineering Thermophysics, Chinese Academy of Sciences, provides a worldwide forum for research and application communications i...Journal of Thermal Science, a quarterly English language journal run by the Institute of Engineering Thermophysics, Chinese Academy of Sciences, provides a worldwide forum for research and application communications in the field of thermal and fluid sciences. The journal publishes high-quality papers of original work on experimental, numerical and theoretical investigations which give better insight into the major areas of thermal and fluid sciences. The scope of the Journal covers the following aspects:展开更多
Journal of Thermal Science, a quarterly English language journal run by the Institute of Engineering Thermophysics, Chinese Academy of Sciences, provides a worldwide forum for research and application communications i...Journal of Thermal Science, a quarterly English language journal run by the Institute of Engineering Thermophysics, Chinese Academy of Sciences, provides a worldwide forum for research and application communications in the field of thermal and fluid sciences. The journal publishes high-quality papers of original work on experimental, numerical and theoretical investigations which give better insight into the major areas of thermal and fluid sciences. The scope of the Journal covers the following aspects:展开更多
文摘Based on Iwan′s wake oscillator model developed with the classical van der Pol equation, the differential equation for the response of the vortex-induced vibration (VIV) of the riser considering the effect of the internal flowing fluid and the external marine environmental condition is derived. The effect of the internal flowing fluid on the response of VIV of the riser is studied by means of the Finite Element Method. The results show that the effect of the internal fluid velocity on the VIV of the riser is strong when the natural frequency of the riser is close to the vortex shedding frequency. In addition, the increase of the top tension can decrease the sensitivity of the riser to the internal fluid velocity.
基金supported by the Fun⁃damental Scientific Research Business Expenses of Central Universities(No.NJ2020024).
文摘A new fluid bag buffer mechanism,which can provide large axial stiffness under the small displacement,is designed.The dynamic change laws of the mechanism stiffness and the internal pressure of the fluid bag are studied when it is subjected to impact load.According to the protection performance for the flexible joint and the pressure change in the fluid bag during the impact process,the sensitivity of the geometric parameters of the fluid bag to the axial stiffness is analyzed by using the orthogonal experimental method,and the optimal parameter combination of the geometric parameters of the fluid bag under impact is obtained,leading to the displacement of the inner shell reduce by 41.4%.The results show that the internal pressure of the fluid bag is a rising process of oscillation and fluctuation.The sensitivity of the geometric parameters of the fluid bag to the displacement of the inner shell from high to low is as follows:Height H,radius r,wall thickness t,chamfer A.The correlation between the geometric parameters of the fluid bag and its internal pressure is:H is negatively correlated with the internal pressure,while the r,t,and A are positively correlated with the internal pressure.
文摘Date: April 12-15, 2005 Venue: Zhejiang University, Hangzhou, P. R. China Organized by Institute of Mechatronic Control Engineering, Zhejiang University
基金The project supported by National Natural Science Foundation of China.
文摘Two-dimensional internal waves generated by a moving flat body in a continuous- ly stratified fluid are investigated by using three kinds of flow-visualization methods:electrolytic precipitation,hydrogen bubbles,and dye streaks.Attentions are paid mainly to the generation and propagation process in the upstream region under low internal Froude number(1/10π<F_r<1/2π).The features of the upstream disturbances as well as their relationship with stratification number K (K=1/F_r) are illustrated.The corresponding theoretical analysis is briefly presented,and by comparison,the experimental and theoretical results agree well.
文摘Editorial Advisory Board AUNG, Win U.S.A. BERGLES, Arthur E. U.S.A. CHEN,XueJun China DVORAK, Rudolf Czech GAL-OR, Ben Israel GALLUS, H.E. Germany GRUNDMANN, Roger Germany HUANG, Zhao Xiang China IVANOV, Michail Russia LEFEBVRE, A.H. U.S.A. LEONTIEV, A.I. Russia MA, Chong-Fang China MA, Tong Ze China MARTYNENKO, O.G. Belorussia NAKORIAKOV, V.E. Russia RAUTENBERG, Manfred Germany SWITHENBANK, J. United Kingdom WANG, Bu Xuan China WENG, Shi Lie China WU, Cheng Kang China YE, Da Jun China ZIEREP, Jurgen
文摘Editorial Advisory Board AUNG, Win U.S.A. BERGLES, Arthur E. U.S.A. CHEN, XueJun China DVORAK, Rudolf Czech GAL-OR, Ben Israel GALLUS, H.E. Germany GRUNDMANN, Roger Germany HUANG, Zhao Xiang China IVANOV, Michail Russia LEFEBVRE, A.H. U.S.A. LEONTIEV, A.I. Russia MA, Chong-Fang China MA,TongZe China MARTYNENKO, O.G. Belorussia NAKORIAKOV, V.E. Russia RAUTENBERG, Manfred Germany SWITHENBANK, J. United Kingdom WANG,BuXuan China WENG, Shi Lie China WU, Cheng Kang China YE, Da Jun China ZIEREP, Jurgen
文摘Journal of Thermal Science, a quarterly English language journal run by the Institute of Engineering Thermophysics, Chinese Academy of Sciences, provides a worldwide forum for research and application communications in the field of thermal and fluid sciences. The journal publishes high-quality papers of original work on experimental, numerical and theoretical investigations which give better insight into the major areas of thermal and fluid sciences. The scope of the Journal covers the following aspects:
文摘Journal of Thermal Science, a quarterly English language journal run by the Institute of Engineering Thermophysics, Chinese Academy of Sciences, provides a worldwide forum for research and application communications in the field of thermal and fluid sciences. The journal publishes high-quality papers of original work on experimental, numerical and theoretical investigations which give better insight into the major areas of thermal and fluid sciences. The scope of the Journal covers the following aspects:
