A voltage signal rect ( tt / pw ) multiplied by normal noise is demonstrated for 2 - d dependence of the waveform on time and trials and 2 - d dependence of spectrum on frequency and trials to show different time domain and frequency domain properties of a random process including noise and signal 以乘上准常态杂讯之方波电压讯号为例,图示含有杂讯电压讯号其波形随时间及试验之二维变动及频谱随频率及试验之二维变动,显示杂讯与讯号之随机过程在时域与频域之不同特性。
A modulated signal of rect ( tt / pw ) added by a zero mean uniform noise . is demonstrated for 2 - d dependence of the waveform on time and trials and 2 - d dependence of spectrum on frequency and trials to show different time domain and frequency domain properties of a random process including noise and signal 以双边递减波电压讯号加上含有准常态杂讯为例,图示含有杂讯电压讯号其波形随时间及试验之二维变动及频谱随频率及试验之二维变动,显示杂讯与讯号之随机过程在时域与频域之不同特性。
A new type of viscoelastic stochastic finite element method is established using first - order perturbation theory based on local averaging method of random field and karhunen - loeve expansion theory of random process . the amount of computations is greatly reduced by transforming correlated random variables to a set of uncorrelated random variables . the relations of different random response variables are analyzed and monte carlo simulations for viscoelastic stochastic structures are investigated 基于随机场的局部平均法以及随机过程的karhunen - loeve分解理论,通过一阶随机摄动方法建立了考虑材料近似不可压缩的粘弹性随机有限元公式,由相关结构分解减少计算量,分析了各结构随机响应量之间的关系,给出了数字特征的计算方法,研究了粘弹性随机结构的montecarlo模拟验证方法。
The stochastic structure and stochastic intelligent truss structure are taken as research object in this paper . the analytical model and method of the structural dynamic characteristic are investigated . when the applied forces are random excitation or random process ( stationary random process or non - stationary random process ) excitation , the structural dynamic response , the active vibration control for the intelligent structure , the optimal placement of the sensor and the actuator and the optimization of the feedback gains of the closed loop control system for the intelligent structure , and the effects of the structural parameters on the active vibration control et al are all studied systemically 本文以随机结构和随机智能桁架结构为对象,对结构动力特性分析模型与求解方法进行了研究;对结构在随机力或随机过程(平稳随机过程或非平稳随机过程)激励下,结构的动力响应、结构的振动主动控制、智能结构中作动和传感元件配置位置与闭环控制系统增益优化、结构参数对振动主动控制效果的影响等问题开展了全面而系统的研究。
Based on the mathematical model for analyzing the seismic responses of submerged tunnels proposed by choshiro tamura and shunzo okamoto , the analytical model for calculating the stochastic earthquake responses of the whole underground structure was proposed and the formulas for evaluating the stochastic characteristics of the underground structural seismic responses were derived . the dynamical mean - square responses of the nanjing changjiang tunnel under gauss stationary random process were calculated . 3 2将日本田村重四郎?冈本舜三提出的沉埋隧道地震反应分析的数学模型应用于地下结构随机地震反应分析,利用数值分析方法建立了隧道整体随机地震反应分析的数学模型,得到了地下结构整体随机地震动力响应数字特征的数学表达式,为地下结构整体随机地震反应分析及动力可靠度的研究提供了一种分析途径。