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    室外設備的振動試驗、沖擊試驗



    振動試驗

    振動試驗用于評定外部設備在其預期的運輸和使用環境中的抗振能力。如果需耍和條件許可。建議做振動和其它環境條件的綜合試驗。振動試驗按GJB 150.16-86中規定的方法進行。設備的振動環境分運輸引起的振動和使用引起的振動兩種情況,細分有十種類型。對具體的外部設備應分析比較,確定其主要屬于在哪種(或哪兒種)振動類型環境中工作的設備。如果有類似的應力水平和類似帶寬,則應使用最嚴酷的一類作為代表。

    如果設備運輸中受到的振動最值高于使用中受到的振動一峨值。那么運翰和使用振動試驗兩者都應做。反之。如果使用振動量值大于運輸振動最值,則運輸試驗可不做。試驗嚴酷等級由頻率范圍、功率譜密度(振幅)及持續時間等參數表示。通用的振動試驗方法有:正弦定頻試驗、正弦掃描試驗、窄帶隨機掃描試驗、寬帶隨機振動試驗、寬帶隨機疊加正弦振動試驗、寬帶隨機往加窄帶隨機掃描振動試驗、運輸頗簸臺上的運輸振動試驗和跑車試驗八種。根據設備的振動環境類型確定試驗方法、試驗條件和試驗程序。

    此外,振動鑒定試驗用來驗證設備在給定的使用壽命期內能否在使用環境下滿意地工作。鑒定試驗包括兩部分內容:一部分是振動功能試驗,另一部分是耐久試驗。做鑒定試驗的順序是先做一半功能試驗。再作耐久試驗,最后做后一半功能試驗。使用中帶有減振裝置的設備,一般應帶上減振裝置進行試驗·試驗時一般應沿相互垂直的三個軸向激勵試驗樣品。掃描方式多采用對數連續掃描。掃描率應小于或等于每分鐘一個倍頻程。試驗裝置為各種振動臺或跑車運輸。

     

    沖擊試驗

    外部設備在作戰、使用和裝卸。運輸,維修等過程中可能遇到各種沖擊作用。所以應進行沖擊試驗。沖擊試驗應按照GJB 150.18-86中規定的方法進行。可根據設備可能遇到的沖擊環境選做以下有關試驗:

    1.運輸跌落試驗

    該項試驗適用于裝在包裝箱中的設備在用人力、卡車、火車等運往戰斗地點過程中可能遇到的正常運輸裝卸的跌落沖擊。

    2.工作臺上的傾跌試驗

    該項試驗適用于需要在工作臺上進行維修的設備,在維修過程中可能遇到的傾跌沖擊,若確認運輸跌落試驗的嚴酷度高于本項試驗,則進行過運輸跌落試驗后可免做本項試驗。

     

    3.鐵路車輛撞擊試驗

    本項試驗適用于需鐵路運輸的設備在運輸過程巾可能遇到的車輛相撞沖擊·撞擊速度分別為13.014.516.2 km/h,容差5%

    4.包裝件的粗暴裝卸試驗

    適用于包裝件在運輸、儲存過程中因不適當的裝卸而受到的沖擊。

    5.基本設計試驗

    本項試驗適用于裝在飛行器上及孕而設備在使用和裝卸中預期可能遭受的非重復性沖擊。通過試驗考核設備在沖擊作用下的電性能、機械性能及結構強度是否達到設計要求。試驗沖擊波形為半正弦波或后峰鋸齒波。嚴酷等級由峰值加速度和持續時問以及速度變化鼠等參數表示。

    6.墜撞安全試驗

    本項試驗適用于考核機載或車載設備的支架、緊固件、連接件等附屬件承受沖擊的能力。根據設備的用途選擇沖擊脈沖波形、峰值加速度、持續時間及速度變化量、確定試驗嚴酷等級。

    7.溫度一沖擊綜合試驗

    沖擊試驗一般在室溫條件下進行。必要時可要求試驗樣品在高溫(或低溫)和沖擊環境條件下進行綜合試驗。要明確規定高()溫的極限值。

    8.艦船設備沖擊試驗

    該項試驗適用于艦船設備在作戰中可能遇到的水下爆炸等產生的強烈沖擊,也可用于高強度碰撞。目的是考核設備承受強沖擊能力。試驗類型有核機試驗、分機試驗和部件試試臉。對于質最不超過120 kg的試驗樣品,在輕型沖擊機上作試驗,沿試驗樣品三個互相垂直的主軸方向各施加3次沖擊,落錘高度依次為0.30.91.5 m。對質量在0.12 t-2.7 t之問的試驗樣品,在中型沖擊機上沖擊6次。隨設備質最不同,落錘高度也不同,設備位于水平和傾斜兩種姿態承受沖擊。對于質攝在2.7t-13.4t之間的試驗樣品,用浮動沖擊平臺作試驗。試驗前和試驗后都要對試驗樣品進行外觀檢查和電性能。機械性能檢測。

    監測用的加速度傳感器應剛性地連接在試驗樣品一與臺而中問或樣品與安裝夾具的靠近臺而中心的固定點上。沖擊測鼠儀除了應用加速度傳感器外,還可以與計算機聯機進行記錄分析。記錄脈沖持續時問。脈沖峰值加速度。沖擊波形,也可以進行波形容差分析、沖擊譜分析和模態分析。

    更多文章請點擊www.huanyi-group.com,www.dghuanyi.com。

     

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