环境温度变化对导引头伺服机构摩擦力矩影响分析及实验研究

Impact analysis and experimental research on friction torque of seeker servo mechanism under changing temperature

建立包含框架热致耦合变形的导引头伺服机构摩擦力矩分析模型,重点研究环境温度变化对角接触轴承几何参数及摩擦力矩的影响。以反射镜式导引头为例进行摩擦力矩分析,结果表明:随着温度的降低,润滑脂黏度的上升是导致伺服机构在低温时摩擦力矩剧烈上升的主要原因,框架耦合变形占比较小。搭建基于电测法的摩擦力矩测试系统,用快速温变实验箱模拟环境温度,测量伺服机构摩擦力矩并与理论计算结果进行对比分析,实验证明摩擦力矩实验结果与理论模型计算结果一致。

A friction torque analysis model of seeker servo mechanism including thermal coupling deformation was established. The influence of changing environment temperature on geometry parameters and friction torque of angular contact bearing was mainly studied. Taking mirror-type seeker as an example, its friction torque was calculated and analyzed by using the proposed calculation model. Results show that the grease viscosity is the main cause for the dramatic rise of the friction torque with the decreasing of the temperature, while the thermal deformation has a small impact on it. Based on the electrical method, an experimental system for friction torque measurement was established. And a rapid temperature experiment chamber was used to simulate environment temperature. Theoretical calculation results and experimental results were compared and analyzed. Experiments prove that the results of friction torque experiment agree with the theoretical model calculation.