The snapshots display the effect of ultrasonic propagation by groove,and we can obtain the different characteristics and sensitivity frequency in frequency domain and the signal that has been analyzed is intercepted from the A-scan curves from the back wall echo.
从比较成熟的有限元基本理论出发,建立具有吸收边界的二维有限元数值模型,对含有不同大小凹槽的模型进行了数值模拟研究;由波场快照图清晰地显示了凹槽对声波传播的影响,通过对截取的时域A-扫描曲线上底面回波进行频谱分析得到的频域特征量和灵敏频率可以识别出不同宽度的凹槽。
With the characteristics of frequency domain and the sensitivity frequency obtained from the spectral analysis to the echo information,we can recognize the different inclusions.
由波场快照图清晰的显示出不同夹杂对声波传播的影响;通过时域A扫描曲线上底面回波到达时间计算出的区域厚度和实际相符,从而验证了模拟结果的正确性;重点底面回波进行了频谱分析,通过各种频域特征量和灵敏频率可以识别出不同材料的夹杂。
Secondly, the damage extents are obtained by the frequency sensitivity method.
首先利用损伤前后结构柔度矩阵的改变来确定损伤发生的位置,再使用频率灵敏度法来计算损伤程度。
Comparison of wavelet transform and Fourier transform in analyzing signal frequency;
小波变换和傅立叶变换在信号频率分析中的比较
The relation between signal frequency and measured velocity variation and the largest velocity variation,which can be responded by photomultiplier and digital oscilloscope in the VISAR application are discussed.
论述了ＶＩＳＡＲ测速中信号频率与被测速度增量的关系和光电倍增管、数字示波器所能响应的最高速度增量。
It is concluded that it is currently inadvisable to replace the generator rotational speed signal with the terminal voltage frequency signal as the PSS input state variable.
分析了电网运行方式或电网结构变化对PSS工作特性的影响,提出了目前加速功率型PSS中不宜采用发电机组机端电压频率信号代替发电机组转速信号的观点。
On the basis of the demand of manufacturing the checkout device,this paper analyzes the frequency signals of the aeroengine rotate speed and vibration,and then two signals of generating circuits are designed to simulate the corresponding signals.
根据研制某检查仪的任务需求 ,对某航空发动机转速频率信号、振动频率信号进行分析 ,设计了模拟相应频率信号的发生电路 ,用于检查仪的研制。
to compose a frequency signal digital detection analysis device.
利用单片微机 80 C31 BH的特殊功能 ,外加 81 C55、2 7C64及451 4等外围芯片构成一频率信号数字检测分析仪。
Sensitivity Analysis of Gear Structures Vibration with Random Parameters
齿轮随机参数结构固有频率灵敏度分析
Analysis of eigenvalue sensitivity for a railway vehicle suspension system
铁道车辆悬挂系统振动特征频率灵敏度分析
Second Order Sensitivity for Evolutionary Structural Frequency Optimization: The Concept & Application;
渐进结构频率优化的二次灵敏度及其应用
A highly sensitive GPS signal acquisition technique using frequency error correction
应用频率误差修正的高灵敏度GPS信号捕获技术
Natural frequency reliability sensitivity analysis of a rotor system
转子系统振动的频率可靠性灵敏度分析
High intensity in the higher frequencies does much more damage to sensitive and accurate measuring equipment than high intensity at the low frequencies.
高频率高强度比低频率高强度对灵敏度高的精密测量设备的破坏性大得多。
Mediation of Prestin Expression and Piezoelectricity on Auditory Sensitivity and High Frequency Responsibility
耳蜗外毛细胞动力蛋白对听觉灵敏度与频率响应的调控机制
Research on Condenser High Sensitivity Low-frequency Microphone Based on MEMS
基于MEMS的高灵敏度电容式低频传声器
Frequency Shaping of Mixed Weighted Sensitivity Function for BTT Missile
BTT导弹加权混合灵敏度函数频域整形
The Sensitivity Analysis of the Cladding Modes of LPFG on the Ambient Refractive Index
LPFG包层模对环境折射率的灵敏度分析
The limited sensitivity of present pulsar surveys and the greater frequency drift make the more distant pulsars difficult to observe.
目前脉冲星普查的有限探测灵敏度和大的频率漂移，使我们难以观测到更遥远的脉冲星。
High sensitivity and broadband laser power ratiometer system
高灵敏度宽波段激光功率计比率计系统
Optimization of car interior low frequency noise based on sensitivity analysis
基于声压灵敏度分析的轿车车内低频噪声优化
Research on Condenser High Sensitivity Low Frequency Microphone Based on Circular Silicon Diaphragm
基于硅膜的电容式高灵敏度低频传声器研究
Sensitivity analysis of powerflow transfer probability for a vibration transfer path system
振动传递路径的功率流传递度灵敏度分析
The instrument is stable and reliable and has high sensitivity and resolution.
该仪器性能稳定、靠，有高的灵敏度和分辨率。
Radiated Sound Power Sensitivity Analysis Based on Statistical Energy Analysis Model
基于统计能量模型的辐射声功率灵敏度分析
New test method of detection sensitivity based on probability curve
基于探测概率曲线的探测灵敏度测试方法