变曲率绝热层挤压变形与缠绕压力控制

Extrusion Deformation of Heat Insulation withVariable Curvature and Winding Pressure Control

研究了固体火箭发动机燃烧室变曲率绝热层橡胶挤压变形机理,揭示、阐明了变曲率绝热层橡胶挤压变形规律,得到了缠绕压力沿胶带宽度方向的分布规律,并分析了缠绕压力分布对绝热层缠绕成型质量的影响。提出了基于Hertz接触理论的变曲率绝热层表面橡胶挤压变形数学模型,建立了缠绕成型外加载荷与变厚度橡胶绝热层表面变形的关系。并使用有限元分析软件ABAQUS针对多种真实缠绕情形进行了仿真模拟。结果表明,基于Hertz接触理论的绝热层表面橡胶挤压变形数学模型可以较好地描述缠绕变形情况,通过该数学模型计算得到的缠绕压力值与仿真得到的缠绕压力值吻合度很高,从而验证了模型在其应用范围内的有效性。为绝热层缠绕成型粘接质量的控制以及轨迹规划提供了理论支撑,为后续恒压控制系统的设计提供了相关力学参数。

The rubber extrusion deformation mechanism of the variable-curvature heat insulation of the solid rocket motor was studied,the extrusion deformation law of the variable-curvature heat insulation was clarified,the distribution of winding pressure along the strip width was obtained,and the influence of the pressure of the winding on the winding quality of the heat insulation was analyzed.Based on the Hertz contact theory,the mathematical model of the rubber extrusion deformation on the variable curvature surface of the heat insulation was proposed.The relationship between the winding pressure and the surface deformation of the variable-thickness rubber insulation was established.Finite element simulations about a variety of winding situations was carried out using the finite element analysis software ABAQUS.The results show that the mathematical model of rubber extrusion deformation based on the Hertz contact theory,can better describe the winding deformation.The winding pressure value calculated by the mathematical model is in good agreement with the value obtained by simulation,which verifies the validity of the model in its application range.It provides theoretical support for the control of the bonding quality of the heat insulation winding and trajectory planning,and provides relevant mechanical parameters for the subsequent design of the constant pressure control system.