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    可靠性試驗中振動的概念



    振動是物體機械運動的一種形式,是在工程技術和生產實際中經常遇到的問題.例如,各種機床工作時,由于電機的運轉就會產生振動;飛機在飛行中有振動,船舶在行駛中有振動。汽車在不平的道路上顛波是振動;地履也是一種振動.振動的存在對人類危害較大,如機床的振動會影響其加工精度,運轉機械的振動會影響其工作效率和使用壽命,儀器儀表振動會影響其計址性能,建筑物振動會影響其使用壽命,嚴重時會使其倒塌。

    振動會影響飛機、船舶正常航行,嚴亞時會導致毀機、翻船事故.振動也會影響導彈和衛星的發射,振動還會導致科學試驗失敗等等。在這種情況下。就需要設法隔振、減振.但在某些方而,人們卻要利用振動為人類服務.例如:振動打樁機、振動壓路機和混凝土振搗器都是利用振動使小質hi產生大的沖擊力,用振動試驗臺模擬各種振動狀態,對儀器儀表進行耐振試驗,在設計機器(或結構)時,對樣機進行振動試驗,得出其動態特性,以此作為改進設計的依據,對已投入使用的產品,通過對其振動試驗進行故障診斷,以便預先發現結構中隱藏的危險因素,避免事故的發生;振動能發聲,人們就是依靠聲帶振動來說話、唱歌,各種樂器也都是利用弦、膜、9片的振動發出各種悅耳的聲音,給人以關的享受,鐘利用其擺的振動米計時.為了消除有害的振動,或利用其有利的一面,就要研究振動的規律,并設法定最地瀏出它的大小.振動的單位隨著所測試的振動參數而異。因描述振動的參數有好幾個,所以表示振動大小的單位也有幾個。

    二、振動的分類

    振動是普遍存在的,其表現形式也是多種多樣的.振動的分類方法很多,出發點不同,分類的方法也不同。

    按振動自由度數,可分為單白由度和多自由度振動;

    按振動的運動方程形式,可分為線性和非線性振動;

    按振動有無外界千擾,可分為自山和弧迫振動;

    按振動持續時問長短,可分為穩態和瞬態振動;

    所謂確定性振動,是指其瞬時值隨時間變化的規律可以用確定的數學表達式來描述的振動,如各種機器中零部件有規律的旋轉引起的振動。

    確定性振動又可分為周期振動和非周期振動。周期振動又包括簡諧振動,即正弦振動和復合周期振動兩類。而常見的非周期振動是一些沖擊與瞬態振動。所謂隨機振動是指其瞬時值的變化沒有規則,無法用確定的數學式喪示的振動。隨機振動信號與確定性振動不同,它只能用概率與統計的方法經過處理以后才能獲得表征其特性的各種信息.如平均值,概串密度函數,相關叻數功率譜密度等米表示隨機變最的特征。

    雖然在實際工程中碰到的大部分屬隨機振動,似簡諧振動是最基本的振動類型。復合周期振動可用傅.叭葉級數表示為很多離散頻率的簡諧振動的鑫加,非周期振動也可用傅里葉積分表示為很多連續頻率的簡諧振動的積分。基礎上進行的.下面從分析簡諧振動入手,來研究振動計旦和測試的理論和方法

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