多气门汽油机气道与燃烧室自由曲面的重构修正  

Surface Reconstruction and Modification of Port-Combustion Chamber Structure for a Gasoline Engine

作　　者：黄琪 张力[2] 李应权 苏伟 商宪锋[2] 徐宗俊[2] 

机构地区：[1]中国嘉陵工业集团,重庆400032 [2]重庆大学机械工程学院,重庆400030

出　　处：《重庆大学学报（自然科学版）》2004年第5期107-110,共4页Journal of Chongqing University

基　　金：重庆市科技攻关重点项目(7823-2)

摘　　要：气道与燃烧室结构直接影响汽油机的各项主要性能,逆向工程的方法和途径被应用于多气门汽油机气道与燃烧室结构的三维复杂自由曲面的几何重构。在通过非接触式激光扫描采集得到大量而离散的样件表面原始数据的基础上,经过数据处理、曲面生成、曲面检查、曲面重构、光顺性评估等手段,实现了四气门双球形燃烧室汽油机的气道与燃烧室结构的反求,为通过对原型产品局部结构型式和尺寸的变异进行仿造创新提供了必要条件。Geometry of port-combustion chamber has an important effect on the performance of gasoline engines. Methods and approaches in reverse engineering are introduced into surface reconstruction and modification of a port-combustion chamber structure. Free-form surfaces of the port-combustion chamber structure for a gasoline engine with 4-valves and dual-ball type combustion chamber are successfully reconstructed in the reverse way through data processing, surface modeling, surface verifying, surface re-modeling and smooth evaluating etc., based on laser-scanned point cloud data of a sample work piece. It lays a foundation for imitation innovation of gasoline engine by changing the local structural characteristics and dimensions of a prototype model.

关 键 词：曲面重构 进排气道 逆向工程 CAD/CAM 

分 类 号：TK421.3[动力工程及工程热物理—动力机械及工程]