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    當前位置:文檔庫 > 電振動臺的振動功率譜密度計算

    電振動臺的振動功率譜密度計算

    振動臺在使用中經常運用的公式

    1 電振動臺在使用中經常運用的公式

    1、 求推力(F )的公式

    F=(m 0+m 1+m 2+ ……)A …………………………公式(1) 式中:F —推力(激振力)(N )

    m 0—振動臺運動部分有效質量(kg )

    m 1—輔助臺面質量(kg )

    m 2—試件(包括夾具、安裝螺釘)質量(kg )

    A — 試驗加速度(m/s 2)

    2、 加速度(A )、速度(V )、位移(D )三個振動參數的互換運算公式

    2.1 A=ωv ……………………………………………………公式(2) 式中:A —試驗加速度(m/s 2)

    V —試驗速度(m/s )

    ω=2πf (角速度)

    其中f 為試驗頻率(Hz )

    2.2 V=ωD ×10-3 ………………………………………………公式(3) 式中:V 和ω與“2.1”中同義

    D —位移(mm 0-p )單峰值

    2.3 A=ω2D ×10-3 ………………………………………………公式(4) 式中:A 、D 和ω與“2.1”,“2.2”中同義

    公式(4)亦可簡化為: A=D f ?2502

    式中:A 和D 與“2.3”中同義,但A 的單位為g

    1g=9.8m/s 2

    所以: A ≈D f ?252

    ,這時A 的單位為m/s 2

    定振級掃頻試驗平滑交越點頻率的計算公式

    3.1 加速度與速度平滑交越點頻率的計算公式

    f A-V =V A

    28.6 ………………………………………公式(5)

    式中:f A-V —加速度與速度平滑交越點頻率(Hz )(A 和V 與前面同義)。

    免費下載Word文檔免費下載: 電振動臺的振動功率譜密度計算

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