In this study,it is aimed to develop a generic model which calculates the trajectory of the ejection seat from the jet aircraft,by taking into account the parameters that will affect the seat movement such as the seat...In this study,it is aimed to develop a generic model which calculates the trajectory of the ejection seat from the jet aircraft,by taking into account the parameters that will affect the seat movement such as the seat’s launch speed,ejection direction,ejection angle,altitude of the aircraft,distance/height from the aircraft rudder and canopy,pilot and ejection seat weight.With the model algorithm proposed,the ejection seat trajectory model was developed on MATLAB.The ejection seat trajectory model is based on point mass trajectory mathematical model.In this study,an analytical study of the problem has been made for modeling the flight trajectory of the ejection seat after it has been ejected.Past studies were used as a basis for validation and simulation.By writing a generic MATLAB code,a user interface was developed and presented to the user as a module.This generic code that has been developed could be used for simulations by users in the future by revising it in accordance with their own job descriptions.展开更多
基于降落伞的重要应用与设计的实际需要,降落伞的数值模拟开始得到越来越多的重视,而充气过程是其中最为复杂的一个阶段。本文建立了平面圆形伞主充气过程中的CFD(Computational Fluid Dynamics)与结构动力学的MSD(Mass Spring Damper)...基于降落伞的重要应用与设计的实际需要,降落伞的数值模拟开始得到越来越多的重视,而充气过程是其中最为复杂的一个阶段。本文建立了平面圆形伞主充气过程中的CFD(Computational Fluid Dynamics)与结构动力学的MSD(Mass Spring Damper)之间的耦合模型。流场求解采用稳定性较高的标准k-ε模型,在多块贴体坐标下,获得某时间节点处的流场,并将该流场中的压力数据引入MSD模型,以获得下一时间节点的伞衣形状,最终获得主充气过程中伞衣形状和流场之间的动态关系。数值计算结果和实验结果及经验值比较,均有较好的一致性。充气过程的数值求解有助于提高对降落伞充气过程机理的理解。展开更多
文摘In this study,it is aimed to develop a generic model which calculates the trajectory of the ejection seat from the jet aircraft,by taking into account the parameters that will affect the seat movement such as the seat’s launch speed,ejection direction,ejection angle,altitude of the aircraft,distance/height from the aircraft rudder and canopy,pilot and ejection seat weight.With the model algorithm proposed,the ejection seat trajectory model was developed on MATLAB.The ejection seat trajectory model is based on point mass trajectory mathematical model.In this study,an analytical study of the problem has been made for modeling the flight trajectory of the ejection seat after it has been ejected.Past studies were used as a basis for validation and simulation.By writing a generic MATLAB code,a user interface was developed and presented to the user as a module.This generic code that has been developed could be used for simulations by users in the future by revising it in accordance with their own job descriptions.
文摘基于降落伞的重要应用与设计的实际需要,降落伞的数值模拟开始得到越来越多的重视,而充气过程是其中最为复杂的一个阶段。本文建立了平面圆形伞主充气过程中的CFD(Computational Fluid Dynamics)与结构动力学的MSD(Mass Spring Damper)之间的耦合模型。流场求解采用稳定性较高的标准k-ε模型,在多块贴体坐标下,获得某时间节点处的流场,并将该流场中的压力数据引入MSD模型,以获得下一时间节点的伞衣形状,最终获得主充气过程中伞衣形状和流场之间的动态关系。数值计算结果和实验结果及经验值比较,均有较好的一致性。充气过程的数值求解有助于提高对降落伞充气过程机理的理解。
