摘要
飞艇为大惯性飞行器,其建模可以仿照普通飞行器的方法,但要多考虑一些问题:坐标原点取在体积中心而非重心引起的速度、重力及重力矩、转动惯量及惯性积的变换;由于大惯性导致的附加质量计算;飞艇升空及降落对浮力及飞艇质量的影响等。以此为基础,建立了飞艇的六自由度动力学模型。经仿真验证,模型能准确描述飞艇实际情况。
Aim. A very serious flaw in past models of stratospheric airships is that a number of key problems peculiar to airships, which should have been considered, were disregarded. We now explore in this paper how to deal with some of these key problems in modeling an airship. In the full paper, we explain our results of exploration in detail. In this abstract, we just add some pertinent remarks to listing the two topics of explanation. The first topic is： the key problems in the modeling of a stratospheric airship. In this topic, we discuss six problems： （1） the transformations necessitated by the selection of the origin of coordinate system not at the center of gravity, （2） the calculation of additional mass, （3） the changes in buoyancy during the ascent and the descent of airship, （4） the calculation of the thrust vector of its engine, （5） the additional moment of inertia and the additional product of inertia, and （6） the wind models of the airship. The second topic is： the establishment of the airship＇s mathematical model. In the second topic, we present a six-degree-of-freedom nonlinear dynamic model based on the body axes coordinate system whose origin is at the center of the volume of the airship. Finally we give a numerical simulation example, whose results are summarized in four figures in the full paper. These results show preliminarily that our model of the stratospheric airship is fairly satisfactory.
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
2007年第3期383-387,共5页
Journal of Northwestern Polytechnical University
关键词
平流层飞艇
附加质量
转动惯量
六自由度动力学模型
stratospheric airship, additional mass, moment of inertia, six-degree-of-freedom dynamic model
