Gaoya dianqi, 2017 文中搭建了真空断路器试验平台,实现了主轴卡涩等四类机械故障状态。通过将正常及故障状态下的实测振动信号进行经验模态分解,得到所需要的内禀模态函数（intrinsic made function,IMF）,利用能量法求出包含主要故障特征信息的各内禀模态函数分量的能量总量。利用IMF分量能量总量作为特征向量,并以此作为支持向量机输入,分析对比了不同分类策略、核函数的分类时间和分类准确率,经实验分析选用"一对其他"分类策略并且核函数为径向基函数的分类效果最优 ...
冯英 +5 more
doaj
Gaoya dianqi, 2019 为解决基于支持向量机（SVM）的变压器故障诊断中因样本不对称导致诊断准确率降低的问题,提出了一种改进的向上采样策略和SVM结合的方法。首先通过K-近邻算法提取少数类样本数据中的边界数据集并生成新的少数类随机样本,在此基础上向少数类样本中添加人工生成的随机新样本使得两类样本数量达到基本均衡。对比均衡样本和不对称样本下的SVM分类模型的性能,结果表明:该方法能够有效降低SVM分类平面的偏移程度,进一步提高了SVM变压器故障诊断的准确率。
刘晨斐 +4 more
doaj
[Construction of risk prediction models of hypothermia after transurethral holmium laser enucleation of the prostate based on three machine learning algorithms]. [PDF]
Nan Fang Yi Ke Da Xue Xue BaoJiang J, Feng S, Sun Y, An Y.
europepmc +1 more source
[Extracellular matrix materials and tissue regeneration and repair]. [PDF]
Zhongguo Xiu Fu Chong Jian Wai Ke Za ZhiZhao L, Xie H.
europepmc +1 more source
Zhendong Ceshi yu Zhenduan针对螺杆转子铣削加工过程中的颤振问题，提出了一种基于RelifF算法优化最小二乘支持向量机（RelifF‑least square support vector machine， 简称RF‑LSSVM）的颤振监测方法。首先，使用变分模态分解（variational modal decomposition， 简称VMD）和RelifF算法对螺杆转子铣削过程中的振动信号进行分解、特征提取与选择；其次，利用增强鲸鱼算法（enhanced whale optimization algorithm， 简称E ...
doaj +1 more source
[Positive cortical support reduction in treatment of trochanteric femur fractures: history in theory establishment and its inspiration for clinical innovations]. [PDF]
Zhongguo Xiu Fu Chong Jian Wai Ke Za ZhiChang S.
europepmc +1 more source
[Relationship Between Nonsuicidal Self-Injury and Family Resilience Among Adolescents: A Moderated Mediation Model]. [PDF]
Sichuan Da Xue Xue Bao Yi Xue BanWang Y +9 more
europepmc +1 more source
[Application and research progress of mandibular distraction osteogenesis in craniofacial microsomia]. [PDF]
Zhongguo Xiu Fu Chong Jian Wai Ke Za ZhiLi L, Zhang Z.
europepmc +1 more source
[Chain mediating role of family care and emotional management between social support and anxiety in primary school students]. [PDF]
Zhongguo Dang Dai Er Ke Za ZhiLi ZW +9 more
europepmc +1 more source