闭式叶轮五轴原位检测路径规划与实验验证

闭式叶轮结构封闭，流道狭长，叶片弯扭曲大，如何生成无干涉且全局光顺的五轴原位检测路径是制约原位检测技术应用的难点问题。根据闭式叶轮曲面特征，定义了4种形式的可接近锥，基于相邻测轴弹簧模型构造了五轴原位检测路径优化目标函数，并通过前向欧拉差分法最小化该目标函数，在定义的连续检测可接近锥中计算最优测轴方向；采用某型号闭式叶轮完成了可接近锥计算、测轴方向优化、无干涉全局光顺检测路径生成等数值仿真与实测实验，验证了所提方法的可行性和有效性。

5-axis onsite inspection path generation and experimental verification of enclosed impeller

How to generate the 5-axis onsite inspection path of the enclosed impeller with global-fairing advantage is a difficult task, due to its enclosed structure, long-narrow runner and high-bending blades. This paper defines four kinds of accessibility cones, and constructs the objective function of 5-axis onsite inspection path based on the spring model of adjacent inspection axes. The forward Euler-difference method is used to calculate the inspection directions. An enclosed impeller with 5 blades is used to calculate the accessibility cone, optimize the inspection directions and generate the global-fairing inspection paths without interference. The experiments demonstrate the feasibility and validity of the proposed method.