聲發(fā)射相關(guān)論文，探頭安裝實(shí)例圖片、信號(hào)實(shí)例

只看該作者 · 2013-1-5 11:51:07

128 0 00:00:00.0000000 Acquisition Running

ID DDD HH:MM:SS.mmmuuun PARA1 CH RISE COUN ENER DURATION AMP

1 0 00:00:36.7095215 -0.0037 1 54 1920 3699 21145 95

1 0 00:00:36.7095290 -0.0037 3 356 4143 9532 45723 97

1 0 00:00:36.7095320 -0.0037 2 414 1885 3199 21260 92

* Gp# 1[1,3,2] x = 709.5, y = 619.4 dT[ 7, 10] Src Amplitude = 95.0

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* 0 00:00:36.7095290 -0.0037 3 356 4143 9532 45723 97

* 0 00:00:36.7095320 -0.0037 2 414 1885 3199 21260 92

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1 0 00:06:42.1648107 -0.0015 1 13 20 3 194 53

1 0 00:06:42.2219195 -0.0012 1 140 10 3 798 47

1 0 00:06:42.2452030 -0.0021 1 4698 15 22 6606 45

1 0 00:06:42.2757775 -0.0003 1 835 17 9 2658 49

1 0 00:06:42.3010885 -0.0034 1 835 1 2 2658 40

1 0 00:06:42.5704900 -0.0027 1 119 13 2 218 47

1 0 00:06:42.6912040 -0.0055 1 4 2 0 10 48

1 0 00:06:42.6914650 -0.0018 3 16 3 0 16 41

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1 0 00:06:54.1058515 -0.0055 1 2 4 0 17 46

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1 0 00:06:54.3066870 -0.0018 1 2 1 0 2 42

15 407 05:26:12.0888317 Acquisition Aborted

barbaria · 2013-1-5 11:53:32

聲發(fā)射文章

barbaria · 2013-1-5 12:02:16

barbaria 發(fā)表于 2013-1-5 11:53
聲發(fā)射文章

1、檢測(cè)過(guò)程中的部分?jǐn)?shù)據(jù)

ID DDD HH:MM:SS.mmmuuun PARA1 CH RISE COUN ENER DURATION AMP新圖片

圖一檢測(cè)過(guò)程中的部分?jǐn)?shù)據(jù)

2、摩擦模擬信號(hào)的部分?jǐn)?shù)據(jù)

采自信號(hào)線與鋼板之間的摩擦

ID DDD HH:MM:SS.mmmuuun PARA1 CH RISE COUN ENER DURATION AMP新圖片（1）

圖二摩擦模擬信號(hào)的部分?jǐn)?shù)據(jù)

3、電子噪聲信號(hào)

探頭產(chǎn)生的噪聲信號(hào)

ID DDD HH:MM:SS.mmmuuun PARA1 CH RISE COUN ENER DURATION AMP 新圖片（2）

圖三電子噪聲信號(hào)

圖一中13通道中的信號(hào)與圖二中的信號(hào)相似，圖一中4通道中的信號(hào)與圖三中的信號(hào)相似。

通過(guò)以上數(shù)據(jù)的對(duì)比分析可以看出，在檢測(cè)過(guò)程中存在著大量的摩擦信號(hào)。分析產(chǎn)生的原因可能是以下幾點(diǎn)：

1、結(jié)構(gòu)的摩擦，腳手架、容器的支座、裙座、柱腿和平臺(tái)等焊接墊板所引起，產(chǎn)生的聲發(fā)射定位源散布在較大的范圍，而且不滿足Kaiser效應(yīng)，即在降壓后的第二次升壓過(guò)程中仍產(chǎn)生大量的聲發(fā)射信號(hào)。

2、檢測(cè)過(guò)程中信號(hào)線未有效的固定，檢測(cè)過(guò)程中有風(fēng)存在導(dǎo)致信號(hào)線與容器本體產(chǎn)生摩擦。大風(fēng)可吹動(dòng)腳手架上的砂子或移動(dòng)的物體撞擊容器的外殼，風(fēng)吹動(dòng)引起的聲發(fā)射定位源信號(hào)散布在容器迎風(fēng)面的區(qū)域。

3、電子噪聲，根據(jù)大量壓力容器現(xiàn)場(chǎng)檢驗(yàn)的經(jīng)驗(yàn)發(fā)現(xiàn)，采集到的幾乎所有的電子噪聲信號(hào)不是來(lái)自外部環(huán)境，而是來(lái)自聲發(fā)射儀器系統(tǒng)的內(nèi)部。聲發(fā)射系統(tǒng)內(nèi)部的電子噪聲源主要包括探頭、信號(hào)線、前置放大器、電纜線及信號(hào)采集板等。

下次檢測(cè)中應(yīng)注意的問(wèn)題：

1、避免在大風(fēng)天進(jìn)行檢測(cè)，固定好信號(hào)線，避免摩擦。

2、排除結(jié)構(gòu)的摩擦，特別是腳手架、容器的支座等。

3、電子噪聲由于來(lái)自不同通道的電子信號(hào)是互不相關(guān)的，所以不會(huì)形成穩(wěn)定的聲發(fā)射定位源。所以一般不必考慮。

4、檢測(cè)前背景噪聲的測(cè)量中不應(yīng)存在干擾信號(hào)。

5、摩擦信號(hào)與電子噪聲形成聲發(fā)射事件無(wú)法在實(shí)際的容器上定位。

參考文獻(xiàn)

1、沈功田等，無(wú)損檢測(cè)，《現(xiàn)場(chǎng)壓力容器檢驗(yàn)的聲發(fā)射源》，第21卷第7期321～325，1999年7月

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