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,收益序列沒有明顯的自相關性,但其平方或絕對值卻高度自相關,序列的波動呈聚集性。
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 傳統的計算有效值的方法是利用一個周期內等距離散的20個采樣點的瞬時值進行求解,通過計算它們的均方根值來得到有效值。
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計算加速度,其次,給出了位移和速度的一種近似計算公式,最后,推導出響應均方值的離散計算表達式。
Finally , the average value , root - mean - square value , maximum , minimum , spike factor of wind force , wind force moment are analyzed to studied the mutually interference influences to the base force of high buildings and group of buildings 最后分析不同狀態下風力、風力矩的平均值、均方根值、最大值、最小值和峰值因子,探討了風荷載下高層建筑的相互干擾和群樓對建筑物風力影響。
With the idea of bus priority and from the analysis of traffic ' s characteristic of china ' s urban intersections , a multi - objective programming function is constructed to minimize not only the total delay of bus operating but also the mean square value of saturations of car flows of all phases 考慮公交優先,并從我國城市交叉口的交通特徵出發,構造了多目標規劃函數:一是使公交總延誤最小,二是使一般小汽車交通各相飽和度之間的均方差最小。
Passive suspension , pid control semi - active suspension and neural network control semi - active suspension are researched by simulation . white noise , sine wave and sawtooth wave are used for excitation . the root mean square value of vehicle body acceleration , suspension displacement and vehicle wheel load are analyzed 在仿真研究中,路面激勵取為白噪聲、正弦波和鋸齒波,懸架類型采用被動懸架、 pid控制半主動懸架、神經網絡控制半主動懸架三種。
Then , from the expressions of structural random response of the frequency domain , the computational expressions of the mean value , variance and variation coefficient of the mean square value of the structural displacement and stress response under the stationary random excitation or non - stationary random excitation are developed by means of the random variable ’ s 在此基礎上,從隨機振動頻域分析出發,導出了在平穩或非平穩隨機激勵下,隨機結構的位移響應均方值、應力響應均方值的數字特征計算表達式,通過算例驗證了所建模型和所提求解方法的正確性和有效性。
Base on the model founded , this paper assessed the ride performance by analyzed the root mean square value of power spectral density of acceleration of z - axis and round y - axis rotation acceleration at the driver ’ s seat . the root mean square value of suspension working spaces and dynamic tyre loads were also analyzed . base on the assessing system of vehicle ride performance , the root mean square 根據模型建立的實際情況,對車輛標準載荷情況下的平順性指標進行了計算,對人體感受到的振動采用了垂直方向和繞橫軸轉動方向的加權振級來評價,計算了車輛懸架系統的動撓度均方根值和各車輪相對動載荷均方根值的情況,全面的評價了車型的平順性。