失效分析与预防
失效分析與預防
실효분석여예방
FAILURE ANALYSIS AND PREVENTION
2014年
1期
11-14,25
,共5页
超声非线性%测试系统因素%滤波系统
超聲非線性%測試繫統因素%濾波繫統
초성비선성%측시계통인소%려파계통
nonlinear ultrasound%test system factors%filter system
超声非线性测试系统的性能直接影响材料非线性系数测量的可靠性。在非线性系统中，相对于基频信号幅值而言，谐频幅值通常很小，难以观察。本研究对如何在所搭建的测试系统中提取需要的二次谐波信号进行了分析，并研制了相对应的滤波系统，给出高阶有源滤波系统的设计方案和对该系统进行了仿真，仿真结果证实：所研制的滤波系统实现了从大振幅信号中提取小振幅信号的功能，同时抑制了仪器自身所产生的部分非线性因素。
超聲非線性測試繫統的性能直接影響材料非線性繫數測量的可靠性。在非線性繫統中，相對于基頻信號幅值而言，諧頻幅值通常很小，難以觀察。本研究對如何在所搭建的測試繫統中提取需要的二次諧波信號進行瞭分析，併研製瞭相對應的濾波繫統，給齣高階有源濾波繫統的設計方案和對該繫統進行瞭倣真，倣真結果證實：所研製的濾波繫統實現瞭從大振幅信號中提取小振幅信號的功能，同時抑製瞭儀器自身所產生的部分非線性因素。
초성비선성측시계통적성능직접영향재료비선성계수측량적가고성。재비선성계통중，상대우기빈신호폭치이언，해빈폭치통상흔소，난이관찰。본연구대여하재소탑건적측시계통중제취수요적이차해파신호진행료분석，병연제료상대응적려파계통，급출고계유원려파계통적설계방안화대해계통진행료방진，방진결과증실：소연제적려파계통실현료종대진폭신호중제취소진폭신호적공능，동시억제료의기자신소산생적부분비선성인소。
The reliability of the material nonlinearity coefficient measurement is affected by the performance of nonlinear ultrasonic testing system performance directly. In nonlinear ultrasonic testing, the amplitude of harmonic signal is usually smaller than the base signal, and difficult to be detected. This topic analyses how to extract the second harmonic signal from the test system needs,the corresponding filter system is developed,and the design of high-order active filter system is given. Through the study of the simulation of the system, the simulation results confirmed that the system has realized the function of extract small amplitude from the large amplitude signals. At the same time, it can also suppress some nonlinear factors produced by the instrument itself.
