Results 111 to 120 of about 26,411 (164)
Jixie chuandong, 2015 由于齿轮传动存在间隙、摩擦以及时变刚度,其动力学特性具有强烈的非线性。当齿轮发生故障时,如点蚀、剥落以及断齿,振动信号往往伴随有超谐波、次谐波等非线性特征,给齿轮故障诊断带来一定困难,因此有必要研究齿轮不同故障程度时的非线性振动机理。通过应用傅里叶级数来描述齿轮时变刚度,一定程度上避免了分段函数刚度突变问题;通过引入齿轮故障程度因子来描述齿轮故障程度,建立了齿轮故障程度的非线性动力学模型;并搭建齿轮故障演化实验台进行相关实验。仿真和实验结果表明,在一定摩擦因数以及转速时 ...
苏勋文, 王少萍
doaj
Shuitu Baochi Xuebao, 1994 该文提出的变区间线性化方法是对现有线性化方法的改进，应用于淤地坝系的优化规划效果很好。该方法与常用的非线性规划相比具有如下优点：计算结果更为稳定、可靠、计算时间大为缩短；对非线性规划无力求解的复杂问题也能求出最优解。文中的实例说明变区间线性化方法有能力将拦泥库容（坝高）、滞洪库容（坝高）、建坝时序进行同步优化。
武永昌
doaj
Guangtongxin yanjiu, 2018 文章提出了一种新的应用于高速光纤通信系统接收端的数字背向传输（DBP）算法的步长变换选择方法。通过采用斜线方法对光纤非线性系数的指数形式曲线进行近似,找出使斜线的斜率与原曲线各点斜率差值最小情况下的步长,再用于变步长DBP算法中对光纤传输中的非线性损伤进行补偿。在3 200km单信道25Gbaud光纤传输系统中对所提步长选择方案进行了仿真。结果表明,在相同系统中,与其他步长选择方法相比,在最佳入纤功率时所提步长选择方案的Q值提升了0.5dB;当入纤功率越大、非线性效应越强时 ...
黄丽艳 +8 more
doaj
[Sex-specific hemoglobin thresholds for oxygen saturation: A non-linear regression analysis based on Tibetan inpatients]. [PDF]
Beijing Da Xue Xue Bao Yi Xue BanGongjue Z, Mao Y, Dawa P, Laba C, Yan Q.
europepmc +1 more source
[U-shaped association between hematocrit and resting pulse oxygen saturation in Tibetan plateau population]. [PDF]
Zhejiang Da Xue Xue Bao Yi Xue BanGuo Y, Li R, Laba C, Yan Q.
europepmc +1 more source
[Spherical measurement-based analysis of gradient nonlinearity in magnetic resonance imaging]. [PDF]
Sheng Wu Yi Xue Gong Cheng Xue Za ZhiYang X +7 more
europepmc +1 more source
Parameter estimation error based robust adaptive law design and experiments [PDF]
, 2016 Gao, Guan Bin +3 more
core +1 more source
[Design of nonlinear locking mechanism for shape memory alloy archwire of miniature orthodontic device]. [PDF]
Sheng Wu Yi Xue Gong Cheng Xue Za ZhiDai Q +5 more
europepmc +1 more source
[Impact of surgeon's dominant hand-side consistency with surgical approach on operational efficiency of unilateral biportal endoscopic lumbar discectomy: a prospective cohort study]. [PDF]
Zhongguo Xiu Fu Chong Jian Wai Ke Za ZhiLi W, Gao M, Zhang L, Yu Q, Chen X.
europepmc +1 more source