结构抗力指标对飞艇囊体变形的影响

Influence of structural resistance indexes on deformation of airship envelope

摘要:

为研究主要结构抗力指标变化下飞艇囊体变形的状态与特征，用数值方法对一类典型飞艇的充气囊体在不同抗力指标下的变形进行了数值分析.分析结果表明：弹性模量对变形的影响是非线性的，泊松比对变形的影响是线性的，弹性模量对变形的影响明显强于泊松比；相同工况下，囊体长度与绝对变形量之间为平方关系，与相对变形量之间为线性关系；长细比在4~5时，相对变相量曲线近似为水平直线.因此，选用弹性模量较大的膜材、设计合理的飞艇长度并使长细比控制在4~5范围内，有利于减小飞艇囊体的相对变形.

Abstract:

To explore deformation characteristics of airship envelope with different structure resistance indexes, a numerical method was employed to analyze the deformation of a kind of typical airship envelope with different structure resistance indexes. Analytical results show:the effect of elastic modulus on deformation is nonlinear, the effect of poisson ratio on deformation is linear, and the effect of elastic modulus on deformation is obviously stronger than that of poisson ratio. Meanwhile, a square relationship between envelope length and its absolute deformation, a linear relationship between envelope length and relative deformation have been certified under the same working condition. What is more, it was testified that the curve between slenderness ratio and relative deformation was horizontal when slenderness ratio was between 4 and 5. Therefore, to reduce the relative deformation, it is beneficial to adopt envelop materials with large elastic modulus anddesign airship with appropriate length to make the slenderness radio between 4 and 5.