• 作者： 陳紹東
• 作者服務機構： 國立臺灣大學機械工程學系
• 中文摘要： 於承受非恆持隨機激動下之系統，參照PRIESTLEY氏所提俱之演化譜代表式分析之。結果顯示所謂演化反應譜及非恆持平均平方反應值，均可按該系統之即時轉換函數而綜台計算。復持提俱多種系統（單自由度及雙自由度力學系統）於白噪音力作用下之即時加速度平均平方反應式，且為計算畫作圖表，俾按各系統之頻率值應用。其計算結果顯示於散亂「振動吸收」效果之預測應用，於因「模重疊」現象而有甚大加速度平均平方值之瞭解應用。又未顯示有「超越」現象存在，蓋「超越」值係因窄幅激動狀況之近似計算而起，而無涉於系統之本質。
• 英文摘要： Incorporate with the evolutionary spectral representations of nonsta-tionary random processes of Priestley, for systems under nonstationaryrandom excitations the analysis shows that instantaneous transfer functionsplay the role when evaluating evolutionary response spectra and that nonsta-tionary mean square response values are obtainable synthetically bymanipulating with instantaneous transfer functions. Expressions of instan-taneous acceleration mean square responses of single and two-degree-of-freedom systems to white noise loadings are provided, and charts are madeand shown applicable to systems of wide range values of natural frequencies.Applications in transient predictions of random "vibration absorbtion"effects, and in formations of very large loads due to "modal overlappings"of instantaneous acceleration transfer functions are shown. No exceedanceoccurances are shown existing since they are due to calculations of narrowband excitations of approximate approaches which belong not to physicalsystem characteristics．
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