舰艇磁性对抗能力综合评估模型

为精确评估舰艇对抗磁性水雷的能力,本文提出了一种基于层次分析法和模糊综合评价法的舰艇磁性对抗能力评估模型。基于层次分析法建立了舰艇磁性处理与磁性水雷对抗能力评估指标体系,通过专家打分法求得指标权重,利用多级模糊综合评价法进行综合对抗评估,其中隶属度函数采用正态分布函数,模糊综合算子采用乘加、加权平均型算子。采用多物理场仿真和磁性船模在磁性处理前后分别进行对抗能力评估。研究表明:磁性处理前后舰艇对抗磁性水雷的评估分值分数分别提升了35.65分和21.58分。评估结果验证了所建模型的合理性和有效性。

WC—Co硬质合金硬度的磁性评估原理

实验结果和理论分析表明 ,基于与合金的显微结构参数和成分的密切对应关系 ,烧结态的两相 WC- Co硬质合金的比矫顽磁力 HSC同γ相平均自由程λγ 和平均硬度 HV间存在确定的对应关系 :HSC=2 .31- 1.5 0 / (1- 192λγ ) ,HV =5 70 4 +2 397/(1- 1.2 3HSC)。根据上述关系式用 HSC测定值能够有效地无损鉴定烧结态两相 WC— Co合金的γ相平均自由程和间接评估平均硬度。导出了一定钴含量 w Co的两相 WC— Co硬质合金的最高抗弯强度σ。TRS所对应的最佳γ相平均自由程λ。γ=3.15× 10 — 7/ (0 .92 0 -w Co)和最佳比矫顽磁力 H。SC=2 .31- 1.5 0 / (1- 0 .10 8/ 0 .892 - w Co)。根据 HSC与 HV和断裂韧性 Kl C及在 λγ 低于 λ。γ 的情况下同 σTRS的定量关系 :Kl C=31.3- 2 7.1HSC,σTRS=4 .5 4× 10 3- 3.93× 10 3HSC,用 H。SC能够有效地间接评估合金的最佳综合力学性能 HV。 、K。l C和 σ。TRS。

Rockburst hazard assessment based on electromagnetic emission in Xingfu Mine

In order to research the danger caused by the rockburst, the electromagnetic emission （EME） in the coal rock was monitored and analyzed. The higher the stress in the coal is, the stronger the deformation and the failure are, and also the signal of the EME will be. The EME is increased by a relatively large margin before the slight shock and rockburst break out at spot. Therefore, some methods to monitor and forecast the danger of rockburst were proposed, including the critical point and devia- tion values, which was by non-contract method. In the end, the observation of EME in Xingfu was used to analyze and forecast the danger level by the rockburst. Then, the measures were proposed to prevent and cure the rockburst.