波峰因数,Crest factor
1)Crest factor波峰因数
1.The results show that,of the eigenvectors,such as average amplitude,virtual value,peak value,crest factor,kurtosis coefficient,pulse number over threshold,virtual pulse(value) over threshold,which are presently used to detect abnormal sounds of bearings,the combination of the crest factor and pulse number over threshold can mak.结果表明,现行异常声检测用特征量平均幅值、有效值、峰值、波峰因数、峭度系数、超门槛脉冲数、超门槛脉冲有效值中,波峰因数和超门槛脉冲数两个特征量相结合,能够对轴承异常声进行最为可靠和有效的检测。
英文短句/例句
1.By the m eans ofRMSvalue, m axim um peak or crest fac- tor ofbearing vibration, the abnorm alsound can be evaluated quantitatively.异常声可以通过轴承振动波形的均方根值、峰值和波峰因数进行定量评估。
2.peak-ripple factor峰值纹波因数 -脉动直流电流的
3.The number of wave crests and wave troughs of the flame varies regularly with the change of frequences of incoming waves.火苗的波峰和波谷数目随入射声波的频率改变而有规律的变化。
4.Set up the parameter of process. Execute the PM.设定制程参数，按保养计划保养波峰焊机台。
5.Intrusion detection system based on local outlier coefficient wave method and cloud theory基于局部孤立系数波峰法与云理论的IDS
6.Wave crest-length distribution based on numerical simulation and SAR基于数值模拟和SAR的波峰长度分布研究
7.Technology of Peak Sampling from Hand-hold Storage Oscilloscope Based on FPGA基于FPGA的手持式数字存储示波器峰值采样技术
8.On Reason of Peak of Hunan Talent in the Period of the South Song Dynasty(AD1127-1279);南宋时期湖南人才波峰的成因及其思想特点
9.Undulating hills were changed to valleys,起伏的波峰变成波谷，
10.peak clipping distortion峰端削波失真 峰端削波失真
11.Correlation of ABI and Vmax with the wave of doppler blood stream in diabetic patients糖尿病患者踝肱指数与峰值流速和多普勒血流波形相关性的研究
12.A wave with a crest of foam.白浪带有泡沫波峰的浪
13.a wave that is blown by the wind so its crest is broken and appears white.波峰有白色泡沫的海浪。
14.The harmonic number of the spike emission is confirmed by the comparison of the diagnosis with the typical parameters in solar corona.最后从诊断结果和太阳日冕典型参数的比较以确定尖峰辐射的谐波数。
15.Double-peak Fitting of X-ray Diffraction by Voigt Profile FunctionX射线衍射双峰的Voigt峰形函数拟合
16.Different notes have different distances between the tops of the waves.音调不同，声波波峰之间的距离也不同。
17.Effective matching solutions for classical third-order standing and short-crested waves经典三阶驻波、短峰波的有效匹配解
18.How to get a proper value for the wave crest’s extent of potential function method in the field of pattern recognition is a hard problem for a long time.长期以来 ,波峰宽度的取值问题一直是模式识别领域中势函数法的难题 .
相关短句/例句
crest factor波峰因数，波形因数，峰值系数，峰值因数
3)crest factor波幅峰值因数
4)Crest Factory Control波峰因数控制
5)crest factor波峰因子
1.Research on applyingcrest factor to test 3 kinds of coagulation work modes for high-frequency electrosurgical generator;波峰因子在电刀三种凝血模式检测中的应用研究
2.We find that thecrest factor is an effective index of the characteristics of different work modes of high-frequency electrosurgical generator after testing hundreds of high-frequency electrosurgical generators of 22 types in 6 brands.高频电刀在不同的工作模式下对应着不同特征的输出波形,通过对6个厂家的22个型号的上百台电刀进行实际检测,发现波峰因子是一个可以衡量电刀不同工作模式下输出信号特征的有效指标。
3.Puts forward an effective and feasible method to measure thecrest factor of high-frequency electrosurgical generator.提出了一种有效易行的高频电刀波峰因子检测系统的软、硬件设计方案。
6)crest factor波峰因素
延伸阅读
波峰焊基础知识波峰面 ：波的表面均被一层氧化皮覆盖?它在沿焊料波的整个长度方向上几乎都保持静态?在波峰焊接过程中?PCB接触到锡波的前沿表面?氧化皮破裂?PCB前面的锡波无皲褶地被推向前进?这说明整个氧化皮与PCB以同样的速度移动 波峰焊机焊点成型：当PCB进入波峰面前端（A）时?基板与引脚被加热?并在未离开波峰面（B）之前?整个PCB浸在焊料中?即被焊料所桥联?但在离开波峰尾端的瞬间?少量的焊料由于润湿力的作用?粘附在焊盘上?并由于表面张力的原因?会出现以引线为中心收缩至最小状态?此时焊料与焊盘之间的润湿力大于两焊盘之间的焊料的内聚力。因此会形成饱满?圆整的焊点?离开波峰尾部的多余焊料?由于重力的原因?回落到锡锅中 。防止桥联的发生 1、使用可焊性好的元器件/PCB2、提高助焊剞的活性3、提高PCB的预热温度?增加焊盘的湿润性能4、提高焊料的温度5、去除有害杂质?减低焊料的内聚力?以利于两焊点之间的焊料分开 。波峰焊机中常见的预热方法 1、空气对流加热2、红外加热器加热3、热空气和辐射相结合的方法加热 波峰焊工艺曲线解析 1、润湿时间指焊点与焊料相接触后润湿开始的时间2、停留时间PCB上某一个焊点从接触波峰面到离开波峰面的时间3、预热温度预热温度是指PCB与波峰面接触前达到的温度4、焊接温度焊接温度是非常重要的焊接参数?通常高于焊料熔点（183°C ）50°C ~60°C大多数情况是指焊锡炉的温度实际运行时?所焊接的PCB焊点温度要低于炉温?这是因为PCB吸热的结果 SMA?型 元器件 ???度?面板?件 通孔器件?混? 90~100?面板?件 通孔器件 100~110?面板?件 混? 100~110多?板 通孔器件 115~125多?板 混? 115~125波峰焊工艺参数调节 1、波峰高度波峰高度是指波峰焊接中的PCB吃?高度。其?值通常控制在PCB板厚度的1/2~2/3,?大??致熔融的焊料流到PCB的表面?形成“??” 2、?送?角波峰焊?在安??除了使?器水平外??????送?置的?角?通过?角的???可以?控PCB?波峰面的焊接?????的?角??有助于焊料液?PCB更快的???使之返回???3、??刀所???刀?是SMA???焊接波峰后?在SMA的下方放置一?窄?的??口的“腔?”?窄?的腔?能吹出??流?尤如刀??故?“??刀”4、焊料?度的影?波峰焊接?程中?焊料的??主要是?源于PCB上焊?的?浸析??量的???致焊接缺陷增多5、助焊?6、工???的??波峰焊?的工????速??????焊接??和?角之?需要互相???反??整。 波峰焊接缺陷分析: 1.沾锡不良 POOR WETTING:
