飞艇动力学仿真  

Dynamic Equations of Airship

作　　者：张向强[1] 姜鲁华[1] 王生[1] 李兆杰[1] 

机构地区：[1]中国科学院光电研究院,北京100080

出　　处：《计算机仿真》2008年第6期79-82,共4页Computer Simulation

基　　金：中国科学院创新项目:平流层关键技术研究

摘　　要：刚体假设条件下,飞艇动力学行为的核心问题之一是如何获取气动导数和推进系统螺旋桨的性能参数。针对静导数,采用分块粘结技术和O型网格,生成结构化贴体网格单元,利用SST(Shear Stress Transport)湍流模型进行CFD仿真,动导数采用半经验的方法,附加质量采用边条理论计算。螺旋桨性能参数采用结构化网格与非结构化网格相结合的方法,利用旋转机械CFD软件计算。在此基础上给出了飞艇纵向静稳定性的判别方法,建立飞艇非线性动力学方程和小扰动方程。为验证上述方程,给出了纵向阶跃响应,仿真结果表明该方法是有效的,可用于飞艇后续的飞行控制研究。When only rigid body motion is considered, the most important thing of dynamics research of airship is how to get the aerodynamic derivative and the thrust of propulsion system. The CFD method of static derivative was presented by using Shear Stress Transport Model （SST） and structured body - fitted grid generated from multi - block, merge - block and O - grid. The dynamic derivative was obtained by semi empirical method. The added mass was obtained by using slicing theory. The CFD method of propulsion system was put in practice by structured grid and non structured grid. Based on obtained aerodynamic derivative and the thrust of propulsion system, the characteristic of static stability was researched. The nonlinear dynamic equations of airship were assembled. The linear equations of motion were assembled on perturbation theory. After getting the trimmed state by static equations, the step input response of longitudinal motion was represented for verification. The result shows that this method is useful and can be used in the research of flight control.

关 键 词：飞艇 气动导数 计算流体动力学 螺旋桨 

分 类 号：V211[航空宇航科学与技术—航空宇航推进理论与工程]