CAJ | 학술논문

针对逆向工程中分段点无法精确提取导致边界约束信息不准确，进而造成截面特征重构结果不理想的问题，提出一种高精度截面数据重构方法。根据截面数据的离散曲率信息初步提取分段点，确定理想分段点所在区域，并以区域端点为界将截面数据分割成具有单一特征的数据段；优先重构直线，再重构自由特征：耦合边界约束模型和自由特征自身的重构模型，建立优化模型，采用拉格朗日乘子法求解。在自由特征的重构过程中，建立特征间连接点的精确提取模型，利用黄金分割法动态搜索最优连接点。实例分析表明，由于特征间连接点的高精度识别，使得重构结果能很好地还原产品模型的初始设计意图，提高了重构三维CAD模型的精度和质量。
침대역향공정중분단점무법정학제취도치변계약속신식불준학，진이조성절면특정중구결과불이상적문제，제출일충고정도절면수거중구방법。근거절면수거적리산곡솔신식초보제취분단점，학정이상분단점소재구역，병이구역단점위계장절면수거분할성구유단일특정적수거단；우선중구직선，재중구자유특정：우합변계약속모형화자유특정자신적중구모형，건립우화모형，채용랍격랑일승자법구해。재자유특정적중구과정중，건립특정간련접점적정학제취모형，이용황금분할법동태수색최우련접점。실례분석표명，유우특정간련접점적고정도식별，사득중구결과능흔호지환원산품모형적초시설계의도，제고료중구삼유CAD모형적정도화질량。
A high-precision method is proposed to solve the non-ideal cross section feature reconstruction, because the boundary constraint is imprecise, which is caused by the inaccurate segment point in reverse engineering. According to the discrete curvature of the cross section data information, extract segment points preliminary, determine the ideal region of segment points, and divide sectional data into single feature data segment by a regional endpoint. Reconstruct the line first, and then reconstruct free features. Construct optimization model based on boundary constraint model and free feature reconstruction model, use the Lagrange multiplier method to solve this optimization model. In the process of free feature reconstruction, extraction model of precise connection points between features is set up, using the golden section method dynamic to search the optimal point. Examples show that the reconstruction result can restore the original design intent of the product model, and improve the reconstruction accuracy and quality of three dimensional CAD model.