基于GHM多小波的螺栓连接转子装配紧度定量检测方法

螺栓连接转子是由螺栓将若干段转子或轮盘压紧组合而成的一种具有重量轻、强度高、刚性好、各级轮盘材料选择灵活等优点的典型转子结构形式,被广泛应用于航空发动机与燃气轮机。针对螺栓连接转子装配中存在的盲装、试装、装配紧度一致性差、服役中螺栓紧度退化与松动故障,提出了一种基于GHM多小波的螺栓装配紧度定量检测方法。采用兼备对称性、紧支性、正交性、高阶消失矩等优良特性的GHM多小波对螺栓连接转子螺栓装配状态进行特征提取,通过多小波相对能量分布特征定义了装配紧度定量指标,通过实验验证表明所提出的方法可以准确识别螺栓六种由紧到松的状态。

QUANTITATIVE DETECTION METHOD OF ASSEMBLY TIGHTNESS OF BOLTED ROTOR BASED ON GHM MULTIWAVELET

The bolted rotor is a typical rotor structure with light weight, high strength, good rigidity, flexible selection of all kinds of wheel materials, etc., which is formed by pressing and combining several sections of rotors or discs and is widely used in aero-engines and gas turbines. Aiming at blind assembly, trail assembly and inconsistent assembly tightness of bolted rotor, and the degradation and loosening of bolt tightness in service, a quantitative detection method of bolt assembly quality based on GHM multiwavelet was proposed. Using the GHM multiwavelet with excellent characteristics such as symmetry, compactness, orthogonality, vanishing moment and high order vanishing moment, feature extraction of the bolted rotor assembly tightness states was performed. The quantitative detection index of assembly quality was defined by the relative energy band distribution based on multiwavelet. The experimental verification shows that the proposed method can accurately identify six kinds of bolt states from tightness to looseness.