Firstly , the logarithmic return series usually show no or little autocorrelation , whereas the squared values or absolute values of the series have high autocorrelation 首先,收益序列沒(méi)有明顯的自相關(guān)性,但其平方或絕對(duì)值卻高度自相關(guān),序列的波動(dòng)呈聚集性。
The traditional method is that sampling 20 equidistance discrete voltages to calculate the virtual value . to gain the virtual value , we firstly average their square values , and then extract it 傳統(tǒng)的計(jì)算有效值的方法是利用一個(gè)周期內(nèi)等距離散的20個(gè)采樣點(diǎn)的瞬時(shí)值進(jìn)行求解,通過(guò)計(jì)算它們的均方根值來(lái)得到有效值。
The acceleration is first evaluated from governing equation , secondly , the formulae of displacement and velocity are developed basing on some assumptions , and then the discrete expressions of the response mean square value are deduced 首先,直接從控制方程出發(fā)計(jì)算加速度,其次,給出了位移和速度的一種近似計(jì)算公式,最后,推導(dǎo)出響應(yīng)均方值的離散計(jì)算表達(dá)式。