钢丝绳缺陷检测励磁结构尺寸设计

Dimension Design of Excitation Structure for Wire Rope Nondestructive Testing

摘要:

由钢丝绳缺陷类型的性质设计出钢丝绳无损检测励磁结构模型，根据磁化强度对局部缺陷型(LF）和截面积损失型(LMA)缺陷信号的影响选择钢丝绳需要磁化的磁化强度，并以钢丝绳能否磁化到一定的磁化强度作为励磁结构设计合理性的一个依据；根据励磁结构磁化回路等效模型，通过励磁结构尺寸参数设计及理论计算，分析励磁结构尺寸变化对励磁的影响，得出励磁结构的理论计算尺寸，利用得出的励磁结构尺寸进行ANSYS有限元仿真，理论计算尺寸仿真结果与钢丝绳应磁化的磁化强度有一定的差距，通过调节关键尺寸参数可以使钢丝绳达到需要的磁化强度，并以最后的尺寸作为励磁结构尺寸的设计依据.

Abstract:

Wire rope nondestructive testing excitation structure model is established according to the characters of wire rope defect. The value of magnetization intensity was determined by the influence of magnetization intensity to localized fault (LF) and loss of metallic cross sectional area (LMA) defection signals. Meanwhile, whether the rope can be magnetized to a certain degree was regarded as a standard for a rational design judgement. Based on the equivalent circuit model of excitation structure, parameters of excitation structure size were obtained, and then an analysis was made of the impacts of the excitation structure size variation to excitation, as a result, the size of the excitation structure was obtained. A simulation of the excitation structure of finite element by ANSYS shows that there is a gap between the theoretical calculation dimension and the magnetized intensity, an ideal value of intensity can be achieved by adjusting the key dimension values, and the last dimension values provide a reference for the excitation structure dimension design.