While the traditional trajectory planning methods are used in robotic belt grinding of blades with an uneven machining allowance distribution, it is hard to obtain the preferable profile accuracy and surface quality t...While the traditional trajectory planning methods are used in robotic belt grinding of blades with an uneven machining allowance distribution, it is hard to obtain the preferable profile accuracy and surface quality to meet the high-performance requirements of aero-engine. To solve this problem, a novel trajectory planning method is proposed in this paper by considering the developed interpolation algorithm and the machining allowance threshold. The residual height error obtained from grinding experiments of titanium alloy sample was compensated to modify the calculation model of row spacing, and a new geometric algorithm was presented to dynamically calculate the cutter contact points based on this revised calculation model and the dichotomy method. Subsequently, the off-line machining program is generated based on a double-vector controlling method to obtain an optimal contact posture. On this basis, three sets of robotic grinding tests of titanium alloy blades were conducted to investigate the advantages of the proposed method.The comparative experimental results revealed that the presented algorithm had improved the surface profile accuracy of blade by 34.2% and 55.1%, respectively. Moreover, the average machined surface roughness was achieved to 0.3 μm and the machining efficiency was obviously promoted. It is concluded that this research work is beneficial to comprehensively improve the machined quality of blades in robotic belt grinding.展开更多
针对叶尖部位是影响近尾迹流动和声辐射的主要区域,提出V型叶尖结构,对其气动特性和叶尖区域声辐射的特征进行测试。结果发现:V型叶尖结构风力机在输出功率减小0.95%~3.50%的范围内,使得改型后风轮旋转基频及其谐波关系的频率所对应的...针对叶尖部位是影响近尾迹流动和声辐射的主要区域,提出V型叶尖结构,对其气动特性和叶尖区域声辐射的特征进行测试。结果发现:V型叶尖结构风力机在输出功率减小0.95%~3.50%的范围内,使得改型后风轮旋转基频及其谐波关系的频率所对应的旋转噪声减小2.7%~4.5%。同时对叶尖涡的脱落频率所对应的叶尖涡噪声产生影响,使之降低了2.8~9.0 d B,找到V型叶尖的高度是影响风轮旋转噪声和叶尖涡噪声降低的主要因素。展开更多
基金supported by the National Natural Science Foundation of China(No.52075059)the Natural Science Foundation of Chongqing(No.cstc2020jcyj-msxm X0266)。
文摘While the traditional trajectory planning methods are used in robotic belt grinding of blades with an uneven machining allowance distribution, it is hard to obtain the preferable profile accuracy and surface quality to meet the high-performance requirements of aero-engine. To solve this problem, a novel trajectory planning method is proposed in this paper by considering the developed interpolation algorithm and the machining allowance threshold. The residual height error obtained from grinding experiments of titanium alloy sample was compensated to modify the calculation model of row spacing, and a new geometric algorithm was presented to dynamically calculate the cutter contact points based on this revised calculation model and the dichotomy method. Subsequently, the off-line machining program is generated based on a double-vector controlling method to obtain an optimal contact posture. On this basis, three sets of robotic grinding tests of titanium alloy blades were conducted to investigate the advantages of the proposed method.The comparative experimental results revealed that the presented algorithm had improved the surface profile accuracy of blade by 34.2% and 55.1%, respectively. Moreover, the average machined surface roughness was achieved to 0.3 μm and the machining efficiency was obviously promoted. It is concluded that this research work is beneficial to comprehensively improve the machined quality of blades in robotic belt grinding.
文摘针对叶尖部位是影响近尾迹流动和声辐射的主要区域,提出V型叶尖结构,对其气动特性和叶尖区域声辐射的特征进行测试。结果发现:V型叶尖结构风力机在输出功率减小0.95%~3.50%的范围内,使得改型后风轮旋转基频及其谐波关系的频率所对应的旋转噪声减小2.7%~4.5%。同时对叶尖涡的脱落频率所对应的叶尖涡噪声产生影响,使之降低了2.8~9.0 d B,找到V型叶尖的高度是影响风轮旋转噪声和叶尖涡噪声降低的主要因素。
