动态分析(DynamicAnalyzer)基础理论.pptVIP

Analytic Signals 解析信号 A[x(t)] = x(t) + j H[x(t)] …a complex time-history一个复合的时域 x(t) Real实部 Imaginary 虚部 Magnitude数值 Phase相位 A[x(t)] AM 调幅 PM 调相 杭州锐达数字技术 Amplitude Demodulation 调幅 X(t) |A[x(t)]| Real实部 = x(t) Imaginary虚部 =H[x(t)] Envelope包络线 杭州锐达数字技术 Amplitude Demodulation 调幅 Carrier signal（载波信号）: sin ?C t Modulated by signal（信号调制）: A( t ) = Ao (1+m cos ?M t ) Shows up as sidebands（边带）:1/2 m sin (?C ±.?M )t 杭州锐达数字技术 Sidebands 边带 Power spectrum of amplitude modulated signal 调幅信号的功率谱 杭州锐达数字技术 Frequency/Phase modulation 频率/相位调制 Frequency modulation调频V(t) =sin(?c t +?? cos ?M t ) Phase modulation调相 V (t ) =A 0 sin( ?c t +?f sin ?M t ) Mathematically, they are equivalent 计算上，两者是相同的 杭州锐达数字技术 Frequency Demodulation调频 Power spectrum of frequency modulated signal调频信号的功率谱 杭州锐达数字技术 Dynamic Signal Analysis Applications动态信号分析应用 Basic Vibration Measurements 简单的震动检测 Structural Testing 结构检测 Measurement Techniques for Modal Analysis 模态分析中的检测技术 MIMO Measurements 多输入多输出检测方法 Using Synchronous Averaging and Polar Runouts to identify rotating machine defects使用同步平均和两端跳动量来识别旋转机械的缺陷 6. Waterfall Analysis for Rotating Machinery 旋转机械的瀑布图分析 7. Order Tracking for Rotating Machinery 旋转机械阶次跟踪分析 8. Demodulation 检波 9. Making precise Octave and 1/3 Octave SV measurements and Spectrograms能够做精确的倍频程和1/3倍频程噪声振动测试和谱图 10. Data Recording and Event Capture: the key to catching process problems early 数据记录和事件捕捉：关键在于及早的发现过程中的问题。 杭州锐达数字技术 Realtime Octave实时倍频 True realtime octave measurements for measuring regulatory compliance, or for comparison to traditional instrumentation 真正的实时倍频测量技术是为了调整测量，或对比传统的设备 杭州锐达数字技术 Synthesized from FFT 运用快速傅里叶变换合成 Synthesized octave measurements for fast, easy proportional-bandwidth representation with simultaneous FFT 综合倍频测量和同步的FFT，可快速，简单的表现比例带宽。 杭州锐达数字技术 Frequency domain comparison 频域对比 Synthesized tends to have sharp edges 合成趋向于有尖锐的边缘 A tone appears in one band or the other一个音频出现在一个频带或另一个的上 This is still within the filter sha