基于逆向和CFD的挖掘机冷却风扇降噪分析  

Analysis on Noise Lowering of Cooling Fan on Excavator Based on Reverse Engineering and CFD

作　　者：方建华[1] 周以齐[1] 焦培刚[1] 杨红娟[2] 

机构地区：[1]山东大学机械工程学院,济南250061 [2]山东建筑大学信息与电气工程学院,济南250014

出　　处：《武汉理工大学学报》2009年第15期86-90,共5页Journal of Wuhan University of Technology

基　　金：山东省科技攻关项目(2007GG3WZ04017);山东省自然科学基金(Y2006F12)

摘　　要：某型挖掘机发动机冷却风扇附近的噪声比较大,风扇转速为2 250 r/min时其前部噪声甚至达到了110.5 dB。采用逆向技术,通过风扇的三维坐标扫描,点云数据处理,叶片曲面重构等一系列数字化处理,构建了风扇的三维实体模型。通过对风扇流场进行仿真计算,分析了流场中的湍流分布。最后,根据仿真分析及实际经验改进了风扇的结构,经测量发现,改进后的风扇噪声降低了1.5 dB。For a type of excavator, it was found that the noise level nearby the cooling fan on engine was very high. In front of fan, when the fan speed was 2 250 r/min, the noise level even reached up to 110.5 dB. With the reverse technique, by a series of digital processing operations, e.g. scanning three-dimensional coordinates, processing point cloud data, and reconfiguring surfaces of fan blades, etc, the 3-D solid modal of fan was constructed. By simulating and computing the flow field of fan, the distribution of turbulent flow in flow field was analyzed. At last, the fan structure was improved according to simulation analysis and practical experience, and the measurement shows that the noise of fan is lowered by 1.5 dB.

关 键 词：挖掘机 冷却风扇 流场 仿真 湍流 

分 类 号：TP303.2[自动化与计算机技术—计算机系统结构] U464.138.4[自动化与计算机技术—计算机科学与技术]