大数据技术在风电机组运行状态评估及故障诊断中的应用分析

风电机组状态监测数据具有量大、多源、异构、复杂、增长迅速的特点,但当前处理大数据的过程中所使用的诊断方法和预警方法存在一定缺点,难以保证其精度。为了确保处理数据时能够及时了解风电机组的具体情况,分析了风电机组运行状态评估和故障诊断中的分析技术,相关实验表明,这一故障诊断以及预测方法优势显著,且具有一定的可行性。

Modified Cepstral Feature for Speech Anti-spoofing

The hidden danger of the automatic speaker verification(ASV)system is various spoofed speeches.These threats can be classified into two categories,namely logical access(LA)and physical access(PA).To improve identification capability of spoofed speech detection,this paper considers the research on features.Firstly,following the idea of modifying the constant-Q-based features,this work considered adding variance or mean to the constant-Q-based cepstral domain to obtain good performance.Secondly,linear frequency cepstral coefficients(LFCCs)performed comparably with constant-Q-based features.Finally,we proposed linear frequency variance-based cepstral coefficients(LVCCs)and linear frequency mean-based cepstral coefficients(LMCCs)for identification of speech spoofing.LVCCs and LMCCs could be attained by adding the frame variance or the mean to the log magnitude spectrum based on LFCC features.The proposed novel features were evaluated on ASVspoof 2019 datase.The experimental results show that compared with known hand-crafted features,LVCCs and LMCCs are more effective in resisting spoofed speech attack.

大溪治理提升工程建桥一维水动力模拟分析

对丽水大溪治理提升改造工程进行了水动力模拟分析,建立了大溪河道一维恒定非均匀流数学模型,利用软件对大溪河道水面线进行了计算,对比水面线结果,得出雍水情况,大溪干流及好溪支流上的12座桥梁桥底板高程均高于设计洪水位,且净空高度大于0.5 m,跨度和高度都满足防洪要求。

中小型水利工程竣工验收的启示

通过丽水市本级中小型水利工程竣工验收工作的开展,总结分析前一阶段水利工程建设管理,存在重建轻管、竣工验收拖延导致未及时形成固定资产政策处理费用超概算、前期专项审批设置条件不合理后期专项验收难、设计调整多等问题,得出相应的启示,对今后水利工程建设管理、竣工验收提出建议。

防洪堤失事风险分析及风险评价研究

从渗流稳定和堤身整体稳定出发,考虑堤防工程的保护范围、保护对象,提出防洪堤失事风险分析方法。以缙云县壶镇镇好溪干堤防洪一期工程为例,分析堤防失事概率和可能造成的损失,得出相应的风险值。分析结果表明堤防加固后,风险值得到明显降低,防洪效益显著。