为保证复合材料预浸带始终处于适宜铺放成型的工艺窗口内,自动铺带(ATL)成型过程中需要对预浸带的铺放温度进行精确控制。为适应高速率自动铺放,需要研究新的高效加热及精确控制方法。本文提出高加热效率、高响应速率的红外辐射加热方案。通过对红外热源与预浸带能量传输过程的分析,提出了红外加热过程中各传递系数的计算方法和公式。基于各传递系数的分析,建立了静止及运动状态下的红外加热控制方程,并通过两种状态下控制方程的对比,提出了红外辐射稳态因子概念。以静止状态下的实验数据为依据,利用红外辐射稳态因子,经理论推导,获得了预浸带匀速运行时的温度控制律,为红外加热技术在自动铺带成型中的应用奠定基础。
In order to guarantee that a composite prepreg stay in a suitable process window for laying at any time, it is necessary to control the temperature of the prepreg accurately in automated tape-laying(ATL). High speed ATL process calls for a study of new efficienct heating manners and accurate control methods. This paper proposes an infrared heating method which is efficienct, and demonstrates a fast response rate. By analyzing the power transfer between the infrared heat source and the prepreg, the paper proposes calculation methods and equations about the transfer coefficients in the infrared heating process. Based on an analysis of the transfer coefficients, it establishes the temperature controlling equations of infrared heating for both the cases when the prepreg stays stationary and is moving, and through a comparision of the equations under the two different states, the paper proposes a concept of infrared radiation heating: the radiative ratio under steady state. By making use of the experimental data under the steady stationary state and the concept of the radiative ratio under steady state, and through theoretical deduction, the paper obtains the temperature controlling rule under a uniform motion running state. This may serve as a foundation for the application of infrared heating to ATL.
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