Fluid-structure interaction is an important issue for non-rigid airships with inflated envelopes. In this study, a wind tunnel test is conducted, and a loosely coupled procedure is correspondingly established for nume...Fluid-structure interaction is an important issue for non-rigid airships with inflated envelopes. In this study, a wind tunnel test is conducted, and a loosely coupled procedure is correspondingly established for numerical simulation based on computational fluid dynamics and nonlinear finite element analysis methods. The typical results of the numerical simulation and wind tunnel experiment, including the overall lift and deformation, are in good agreement with each other. The results obtained indicate that the effect of fluid-structure interaction is noticeable and should be considered for non-rigid airships. Flow- induced deformation can further intensify the upward lift force and pitching moment, which can lead to a large deformation. Under a wind speed of 15 m/s, the lift force of the non-rigid model is increased to approximatelv 60% compared with that of the rigid model under a high angle of attack.展开更多
The elastic oscillation structure based on central pattern generators(CPGs),which can produce rhythmic motions,is discussed.First,Hopf CPG,the typical CPG model,being a signal generator for the elastic oscillation str...The elastic oscillation structure based on central pattern generators(CPGs),which can produce rhythmic motions,is discussed.First,Hopf CPG,the typical CPG model,being a signal generator for the elastic oscillation structure,is analysed via the theory of differential equations.Next,the well-posedness results of a coupling system composed by the CPG and an elastic beam are proved by means of the linear operator semi-group theory.Then,the numerical results using the finite difference method indicate that the coupled system can obtain a variety of periodic motion behaviours by choosing the internal parameters of the CPG network.Finally,the dynamic simulation of complex system motion is investigated using COMSOL Multiphysics.展开更多
基金the National Natural Science Foundation of China (11202215 and 11332011)the Youth Innovation Promotion Association of CAS (2015015)
文摘Fluid-structure interaction is an important issue for non-rigid airships with inflated envelopes. In this study, a wind tunnel test is conducted, and a loosely coupled procedure is correspondingly established for numerical simulation based on computational fluid dynamics and nonlinear finite element analysis methods. The typical results of the numerical simulation and wind tunnel experiment, including the overall lift and deformation, are in good agreement with each other. The results obtained indicate that the effect of fluid-structure interaction is noticeable and should be considered for non-rigid airships. Flow- induced deformation can further intensify the upward lift force and pitching moment, which can lead to a large deformation. Under a wind speed of 15 m/s, the lift force of the non-rigid model is increased to approximatelv 60% compared with that of the rigid model under a high angle of attack.
基金National Key Research and Development Programme of China,Grant/Award Number:2019YFB1705800National Natural Science Foundation of China,Grant/Award Number:61973270+2 种基金Foundation for Innovative Research Groups of the National Natural Science Foundation of China,Grant/Award Number:61621002Natural Science Foundation of Ningbo,Grant/Award Number:2019A610112Projects in Science and Technique Plans of Ningbo City,Grant/Award Number:2019B10100。
文摘The elastic oscillation structure based on central pattern generators(CPGs),which can produce rhythmic motions,is discussed.First,Hopf CPG,the typical CPG model,being a signal generator for the elastic oscillation structure,is analysed via the theory of differential equations.Next,the well-posedness results of a coupling system composed by the CPG and an elastic beam are proved by means of the linear operator semi-group theory.Then,the numerical results using the finite difference method indicate that the coupled system can obtain a variety of periodic motion behaviours by choosing the internal parameters of the CPG network.Finally,the dynamic simulation of complex system motion is investigated using COMSOL Multiphysics.
