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                                                                                                                                              關于電磁流量計氣泡噪聲的解決方法

                                                                                                                                              發布時間:2018-8-17 13:31:43訪問次數:

                                                                                                                                                     關于電磁流量計氣泡噪聲的解決方法

                                                                                                                                                     首先,應從裝置上滿足電磁流量計上游直管段長度要求,規范外表的裝置,挑選遠離熱源的裝置場所,合理運用管道流速,選用光潔度高的PFA氟塑料面料和高純氧化鋁工業陶瓷導管。這些辦法將有助于防止或減小旋渦和氣體別離的發作。也就是說,改進傳感器制作工藝、改進運用外表環境條件和裝置條件、選用外表上游加裝排氣閥等辦法,有可能防止問題的發作。
                                                                                                                                               

                                                                                                                                               
                                                                                                                                                    加大外表阻尼時刻能有效地處理這種脈沖型氣泡噪聲的影響,一起也帶來了反響遲鈍的缺陷,即當真實流量動搖時,外表反響很慢。這對要求活絡操控的冷卻水體系無疑是個難題。為了處理這個問題,智能化電磁流量計可以運用軟件邏輯判別即粗大差錯處理的辦法。在呈現這種毛病時,經過調整流量的不靈敏時刻和改動起伏約束這兩個條件來判別是流量的改動,仍是氣泡擦過電極。假如不是氣泡擦過電極的噪聲,CPU按正常采樣、運算和數字濾波;假如斷定發作的是氣泡噪聲,切除丈量值,堅持前面的流量丈量值。這樣,正常流量丈量期間阻尼時刻依然為3~6s。只要在有氣泡噪聲時,依據脈沖寬度設置的長短將不靈敏時刻加長,體系操控的時刻也會加長。
                                                                                                                                               
                                                                                                                                                     電磁流量計氣泡噪聲的研究,應該是用氣泡對電磁流量傳感器電極進行模仿實驗,但現在沒有有這種條件。因而,咱們只用電磁流量信號發作器信號的切換,進行氣泡噪聲的模仿。適當地選取阻尼時刻和智能型電磁流量計處理氣泡噪聲毛病的辦法,對調查流量計顯示與輸出信號改動,判別處理氣泡噪聲的作用顯著。切換智能電磁流量計規范信號源的開關,快速設置流速和零點,按需求堅持信號為零的時刻,模仿氣泡噪聲的發作和存在。改動外表阻尼時刻并設置不同的改動率約束值及不靈敏時刻值,測試外表輸出的改動。結果表明,加大阻尼時刻和智能化氣泡噪聲處理都能達到輸出不發作大的改動,后者更有利于正常丈量期間丈量反響速度的進步。


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