大尺寸复合材料薄壁异形回转体零件数字化测量技术研究

Digital Measurement Technology for Large Size Thin-walled Composite Parts with Rotational Symmetry

针对薄壁大尺寸回转体类复合材料零件曲面复杂度高、测量可达性差的问题,研究其非接触数字化测量技术。基于摄影测量建立高精度全局测量场,实现高精度内外形面整体测量误差控制;根据内外形面的特点,设计多传感器组合测量方法,能够在保证扫描精度的同时提高扫描效率。针对内部复杂形面测量,设计一种专用的测量数据采集机构,以解决无法人工携带扫描设备进入型腔内部的难题;并在测量完成后基于几何定位特征进行多源数据融合,进行多段测量数据拼接,最终实现了回转体内外形面高精度整体测量。

The non-contact digital measurement technology accurately measuring the morphology of large-size thin-walled composite parts with rotational symmetry is studied.A high-precision global measuring field is established by the photogrammetry technology to control the overall measurement error of the inside and outside morphologies.Based on the features of internal and external surfaces,the measuring method of multi-sensor combinations is designed to realize scanning accuracy as well as scanning efficiency.A special data acquisition equipment is designed for the measurement of the internal complex surfaces to overcome the difficulty of manual operation in a closed structure.The data from multiple sources are integrated together by the multi-source data fusion base on geometric positioning features and multi-segment measurement data are spliced to achieve the overall high-precision measurement for both internal and external surfaces.