Non-stationary signal combined analysis based fault diagnosis method [PDF]
, 2020 Considering the complementarity between the deep learning,spectrum and time frequency analysis methods,a multi-stream framework was designed by combining the convolutional network,Fourier transform and wavelet package decomposition methods,with the aim ...
Huimin LU +4 more
core +1 more source
Study on vibration response characteristics of kilometre deep shaft induced by frozen soil blasting in ultra deep alluvium [PDF]
, 2022 With the increasing demand for underground resources in China, the construction of ultra-deep shafts is becoming more and more popular. In order to stabilize the shaft wall and reduce the collapse of the shaft wall during the shaft excavation, the ...
Jianxin YU +4 more
core +1 more source
Bandwidth extension method based on nonlinear audio characteristics classification [PDF]
, 2013 A bandwidth extension method based on audio classification was proposed.Time series of audio signals were classified into four types based on recurrence plot and recurrence quantification analysis,and the fine spectrums were recovered by taking advantage
Chang-chun BAO +3 more
core +1 more source
Characteristics of apparent resistivity of coals with different particle sizes [PDF]
, 2022 The theory and technology of stress released CBM development is a new theory and technology for CBM development of tectonically deformed coals. The research on the apparent resistivity of tectonically deformed coal can provide technical support for the ...
Deyi GAO +3 more
core +1 more source
Experimental investigation on fracture behavior of lignite and its fracturing significance:taking Shengli Coalfield as an example [PDF]
, 2023 The anisotropy of fracture properties at different bedding orientations of lignite plays an important role in controlling the formation of fracture network of reservoir racturing.
Diankun ZHANG +2 more
core +1 more source
Speaker verification method based on cross-domain attentive feature fusion [PDF]
, 2023 Aiming at the problem that the lack of structure information among speech signal sample in the front-end acoustic features of speaker verification system, a speaker verification method based on cross-domain attentive feature fusion was proposed.Firstly ...
Haiyan GUO +3 more
core +1 more source
Gaoya dianqi, 2022 为有效利用油中溶解气体分析结果判断油浸纸绝缘套管的缺陷，利用油中溶解气体相对含量构造了气体谱图，提取等效时间长度Teq和等效频带宽度Feq作为气体谱图的特征参量，并用于不同缺陷气体谱图的聚类分离。在此基础上，根据Teq-Feq图形分布结果构造了辨识套管不同缺陷的时频特征值边界，提出了基于谱图时频特征的套管状态诊断方法，并对状态异常的套管进行了诊断。最后，对比分析了谱图时频特征法和Duval三角形法对套管的诊断效果，并利用解体目视检查验证了谱图时频特征用于套管缺陷诊断的有效性。结果表明 ...
韩丹丹, 张亮, 邹梦
doaj
, 2019 针对浅海水声通信面临的复杂干扰环境,提出了一种适用于水声通信系统的认知型时空自适应处理算法。该算法在传统时空自适应阵列处理算法的基础上引入了干扰认知的功能,通过干扰认知处理降低计算量,并且实现干扰样本的选取,确保自适应算法的可靠收敛。利用了协方差矩阵特征分解和多重信号分类(Multiple Signal Classification, MUSIC)估计干扰的个数,辅助选取盲源分离算法中的维度和时空自适应算法中的空域维度,进行算法降维处理。针对采用盲源分离后的各干扰,采用包络检测法提取时域特征 ...
周易, 王峰, 龚道银
core +1 more source
Continuous noise covert transmission scheme based on QCSK [PDF]
, 2022 The existing embedded scheme requires far lower transmission power of the covert system than that of the host system, and thus decreasing the reliability of covert transmission.To figure out the above limitations, a continuous noise covert communication ...
Jing LEI, Ke LAI, Ying HUANG, Zehan WAN
core +1 more source
Multi frequency hopping network station sorting based on joint feature clustering in complex environment [PDF]
, 2023 In order to remove interference from hybrid signals and sort each frequency hopping station signal, a multi frequency hopping network station sorting algorithm based on joint feature clustering was proposed.Firstly, short-time Fourier transform was ...
Jiazheng WANG +4 more
core +1 more source