基于Volterra级数的RFPA特征模型及其仿真实验

主要运用Volterra级数理论分析射频功放(RFPA)器件工作在弱非线性条件下信号失真特性.介绍了Vol-terra级数在非线性建模中的应用,推导了非线性传递函数的公式.在Advanced Design System 2006A软件的仿真环境下对射频功率放大器进行仿真,利用计算机仿真实现了在弱非线性条件下对任意频率输入时功率放大器的输出频谱估计.     

基于表面波形获取水底压力的计算方法及其实验验证

为获取水面波形与水底压力的对应关系,提出基于表面波形获取水底压力的计算方法,建立表面波形和水底压力变化的测量系统.对水面波形测量结果,采用傅里叶级数展开法计算其系数,通过线性叠加法反演重构原来水面波形.根据有限水深色散关系计算不同频率组成波的波数,进一步计算出非规则波、船舶兴波以及船舶在波浪中航行时的水面波形在水底引起的压力变化.仿真结果表明,理论计算与实验结果吻合较好.     

采用变长梁单元的柔性平面连杆机构的KED分析

本文采用变长梁单元来处理机构中的所谓“导杆”构件,在弹性小变形范围内,导出了考虑弯曲、剪切及轴向三种变形型式和计及截面转动惯量、端点集中质量、纵向弯曲影响的柔性平面连杆机构系统最一般的弹性运动微分方程式,不仅使其与全转动副柔性平面连杆机构KED分析在形式上得到了完全统一,而且更简明地给出了求其稳态解的Four柏r级数系数方程式.作为算例,文中给出了一转动导杆机构相应数值计算结果.     

强功率压电超声聚能器研究

介绍梭棒式压电换能器结构及用该换能器串连合成的聚能实验。该系统频率为19.2kHz,电功率容量在2700W以下时,其电声效率可达到0.99。     

小型DIAL装置的选频激光器微型计算机控制系统

本文介绍对DIAL装置中CO_2选频激光器的工作谱线进行搜索、检测、选定及数据处理的微型计算机控制系统的设计思想,各部分功能,控制软件结构及其作用.本系统能保证DIAL装置在实时大气污染等测量时,CO_2激光器的工作谱线选定和谱线转换准确、快速,能将由于空气湍流引起的测量误差减小,从而提高测量的精度.     

Bias‐corrected bootstrap prediction regions for vector autoregression

This paper examines small sample properties of alternative bias‐corrected bootstrap prediction regions for the vector autoregressive (VAR) model. Bias‐corrected bootstrap prediction regions are constructed by combining bias‐correction of VAR parameter estimators with the bootstrap procedure. The backward VAR model is used to bootstrap VAR forecasts conditionally on past observations. Bootstrap prediction regions based on asymptotic bias‐correction are compared with those based on bootstrap bias‐correction. Monte Carlo simulation results indicate that bootstrap prediction regions based on asymptotic bias‐correction show better small sample properties than those based on bootstrap bias‐correction for nearly all cases considered. The former provide accurate coverage properties in most cases, while the latter over‐estimate the future uncertainty. Overall, the percentile‐t bootstrap prediction region based on asymptotic bias‐correction is found to provide highly desirable small sample properties, outperforming its alternatives in nearly all cases. Copyright © 2004 John Wiley & Sons, Ltd.     

On a robust test for SETAR‐type nonlinearity in time series analysis

There has been growing interest in exploiting potential forecast gains from the nonlinear structure of self‐exciting threshold autoregressive (SETAR) models. Statistical tests have been proposed in the literature to help analysts check for the presence of SETAR‐type nonlinearities in observed time series. However, previous studies show that classical nonlinearity tests are not robust to additive outliers. In practice, time series outliers are not uncommonly encountered. It is important to develop a more robust test for SETAR‐type nonlinearity in time series analysis and forecasting. In this paper we propose a new robust nonlinearity test and the asymptotic null distribution of the test statistic is derived. A Monte Carlo experiment is carried out to compare the power of the proposed test with other existing tests under the influence of time series outliers. The effects of additive outliers on nonlinearity tests with misspecification of the autoregressive order are also studied. The results indicate that the proposed method is preferable to the classical tests when the observations are contaminated with outliers. Finally, we provide illustrative examples by applying the statistical tests to three real datasets. Copyright © 2009 John Wiley & Sons, Ltd.     

基于分形三维菊花建模算法

为了在计算机中实现真实感较强的3维菊花模型.通过观测统计,发现花瓣之间以及多层花瓣结构的层与层之间具有统计意义上的自相似性,且花瓣数目依斐波纳契序列分层排列。根据植物形态学原理和图形学技术,采用分形的方法,按照不同花卉的形态结构,完成菊花的建模算法。经过计算机试验给出三维菊花的IFS码。结果逼真,具有一定的实际应用价值。     

时间序列在变形监测中的应用

详细介绍了时间序列的基本原理以及时间序列建模中的数据预处理、模型选择、模型定阶、模型参数的确定及模型的可靠性等建模步骤,并给出了时间序列的预报公式.最后用时间序列分析处理了某市的某-边坡沉降观测数据.通过对结果的分析,得出时间序列分析用于简单的时序预测具有较好的效果,9期预测误差的绝对值均小于0.18 mm.其建模过程...     

一类特殊无穷级数值的计算

利用初等方法及Ｒｉｅｍａｎｎ Ｚｅｔａ－函数的性质研究了一类无穷级数值的计算问题,并且给出了一个精确的计算公式。