孔隙式隔振系统非线性阻尼特性

针对舰载设备隔振系统中双出杆液压孔隙式粘滞阻尼器阻尼力的非线性问题,建立了考虑油液压缩性的隔振系统数学模型,提出了基于AMESIM仿真试验确定隔振系统阻尼力的方法,依据仿真得到的系统压力确定了阻尼力流动指数并验证了流动指数取值的合理性.搭建隔振系统的试验装置,利用通过冲击试验获得的隔振系统位移和加速度响应验证隔振系统数学模型的准确性.结果表明,数学模型仿真和冲击试验结果误差在6%以内,为液压阻尼器非牛顿流体阻尼力的计算提供了有效、快捷的途径.

Research on pipeline disfigurement quantitative recognition based on wavelet analysis

Wavelet of indication partial transform has the characteristics of muhi-scale and multi-resolving power, it provide the ability characteristic in time field as well as frequency field, and can used to observe signals from rough to fine gradually. The function of the wavelet transform, which focusing signals details, has quite a number of merits when inspecting MFL signals. The feature quantity of defective MFL signals were extracted from the recorded flux leakage signals by the wavelet transform. The multi-linear regression method was studied and used to establish regression equations between the size of disfigurements and feature quantity. Therefore, the quantitative recognition for defective size was achieved. The experiments show the validity of the regression equation and the recognition result accuracy being in accepted scope.