1) Time-frequency characteristic
时频特征
1.
Explosive blasted per delay and burden effects on the time-frequency characteristic of vibration induced by blast
爆破振动时频特征的段药量及抵抗线效应
2.
The relationship between the time-frequency characteristic of the cabin’s shock response and the underwater shock environment was obtaine.
应用小波包分析方法,研究了水下爆炸压力和船舱冲击响应的时频分布规律,得到了船舱冲击响应时频特征与冲击环境之间的关系。
3.
Comparing with traditional FFT transform in analytical process,the HHT is found to be self-adaptive and superior in performance,and can effectively extract time-frequency characteristic of vibration signals of ship structures excited by the propeller vortex cavitations.
与FFT变换相比,体现了Hilbert-Huang变换的自适应性和先进性,可以有效提取螺旋桨梢涡空泡激励引起的船舶振动信号的时频特征。
2) Time-frequency characteristics
时频特征
1.
In this article we analyzed the shock response signals of a ship\'s typical part subject to non-contact underwater explosion with HHT method, calculated the Hilbert amplitude spectrum,Hilbert energy spectrum and Hilbert instantaneous energy,and discussed the time-frequency characteristics of the ships\' shock response subject to non-contact underwater explosion.
利用HHT方法分析了某型舰在非接触水下爆炸作用下典型部位冲击响应信号,计算了Hilbert幅值谱、Hilbert能量谱和Hilbert瞬时能量,探讨了非接触水下爆炸作用下舰船冲击响应的时频特征。
3) time-frequency feature
时频特征
1.
And time-frequency feature combines the time feature and the frequency feature as the final feature vector.
5s内的C3、C4通道的幅值和之比作为时域分类特征;在频域范围内,对滤波后数据进行10阶的AR模型功率谱估计作为频域特征;将时域特征和频域特征结合成时频特征向量作为分类特征;在分类器的选择上,使用线性感知器作为分类准则对特征向量进行分类训练。
2.
Since the sand body reservoir have influence on seismic reflected signals in time and frequency and wavelet transform can just reflect the time and frequency components of signals ,therefore,the pa per uses wavelet transform to analyze the time-frequency feature of seismic records.
由于砂体储层对地震反射信号产生时间和频率的影响,而小波变换正好能反映信号的时间及频率成分,所以本文利用小波变换分析了地震记录的时频特征。
3.
The time-frequency features associated with the main frequency band of the motion,walking cadence and the correlation between the vertical and forward acceleration signals were combined to design a multiple classifier.
采用离散小波变换提取与运动相关频带的时频特征,并结合步频以及垂直方向和前进方向加速度信号之间的互相关性,经过特征融合设计了多级分类识别算法。
4) time-frequency characteristic spectrum
时频特征谱
1.
The time-frequency characteristic spectrum of ground motions is presented first.
采用在频域内具有极好紧支性和盒形特性的谐小波作为母小波,推导出基于离散谐小波变换的地震波时变谱连续解析表达式,并提出了能反映地震波的时频特征以及与结构地震反应非常相关的地震波时频特征谱这一新概念;通过数值算例,分析了 Northridge 地震波和 El-centro 地震波的时频分布特征;研究发现,结构的地震反应不但与输入地震波的频域分布特征有关。
5) time-frequency domain character
时频域特征
1.
The linear and quantitative nondestructive test of the grain defect is realized by using time-frequency domain character of the ultrasonic defect signal.
利用超声缺陷信号的时频域特征,较好地实现了该类型药柱的线性定量无损检测。
6) time-frequency discriminant feature
时频判别特征
1.
Weld defect classification in ultrasonic testing basing on time-frequency discriminant features;
基于时频判别特征的焊缝超声检测缺陷分类
补充资料：哭李频员外时在建川
【诗文】：
出麾临建水，下世在公堂。
苦集休开箧，清资罢转郎。
瘴中无子奠，岭外一妻孀。
定是浮香骨，东归就故乡。
【注释】：
【出处】：
全唐诗：卷716-35
出麾临建水，下世在公堂。
苦集休开箧，清资罢转郎。
瘴中无子奠，岭外一妻孀。
定是浮香骨，东归就故乡。
【注释】：
【出处】：
全唐诗：卷716-35
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条