失效分析与预防
失效分析與預防
실효분석여예방
FAILURE ANALYSIS AND PREVENTION
2014年
3期
136-140,150
,共6页
郑金华%高鸿波%张士晶%石剑%王婵
鄭金華%高鴻波%張士晶%石劍%王嬋
정금화%고홍파%장사정%석검%왕선
热障涂层%超声测厚%小波变换模极大值%扫描电镜%Lipschitz指数
熱障塗層%超聲測厚%小波變換模極大值%掃描電鏡%Lipschitz指數
열장도층%초성측후%소파변환모겁대치%소묘전경%Lipschitz지수
thermal barrier coating%measure the thickness using ultrasound%wavelet transform of the modulus maxima%SEM%Lipschitz index
基于超声信号在涂层的上、下表面产生的奇异性，通过对超声信号进行连续小波变换分析，利用模极大值法和Lipschitz指数法进行判断，找出了超声信号中的奇异点。依据热障涂层界面反射信号的时间差，利用已知涂层声速可以算出涂层厚度。通过与扫描电镜所测涂层厚度对比分析，验证了该方法的可行性。
基于超聲信號在塗層的上、下錶麵產生的奇異性，通過對超聲信號進行連續小波變換分析，利用模極大值法和Lipschitz指數法進行判斷，找齣瞭超聲信號中的奇異點。依據熱障塗層界麵反射信號的時間差，利用已知塗層聲速可以算齣塗層厚度。通過與掃描電鏡所測塗層厚度對比分析，驗證瞭該方法的可行性。
기우초성신호재도층적상、하표면산생적기이성，통과대초성신호진행련속소파변환분석，이용모겁대치법화Lipschitz지수법진행판단，조출료초성신호중적기이점。의거열장도층계면반사신호적시간차，이용이지도층성속가이산출도층후도。통과여소묘전경소측도층후도대비분석，험증료해방법적가행성。
Due to the singularity of the ultrasonic signals from the top and bottom surfaces of the coating, the ultrasonic signals can be analyzed through continuous wavelet transform. And the methods of the modulus maxima and Lipschitz exponential were exploited to determine the singularity of the ultrasonic signals. Therefore, the time difference of the reflected signals on the coating interface can be obtained and thickness of the coating can be calculated by using a known speed of sound of the coating. Finally, the results are compared with the coating thickness measured by the SEM to verify the feasibility of this method.
