期刊文献+
共找到8篇文章
< 1 >
每页显示 20 50 100
一个与载荷模拟同步进行的三峰谷计数法则 被引量:8
1
作者 谢敏 张安哥 《华东交通大学学报》 1994年第4期1-7,共7页
应用蒙特卡罗方法产生伪随机数来进行疲劳载荷的计算机模拟,并基于雨流法的基本原理,对“三峰谷计数法则”作了改进,提出了一种能与载荷信号的发生同步进行的统计计数的计算机算法,这使得结构疲劳寿命的估算与疲劳载荷谱的产生的同... 应用蒙特卡罗方法产生伪随机数来进行疲劳载荷的计算机模拟,并基于雨流法的基本原理,对“三峰谷计数法则”作了改进,提出了一种能与载荷信号的发生同步进行的统计计数的计算机算法,这使得结构疲劳寿命的估算与疲劳载荷谱的产生的同步实现成为可能。 展开更多
关键词 疲劳载荷 雨流计数 计算机模拟 疲劳寿命 蒙特卡罗法 三峰谷计数法则 工程力学
下载PDF
《组合数学》复习指导
2
作者 胡智全 《高等函授学报(自然科学版)》 1998年第3期16-19,共4页
关键词 《组合数学》 复习指导 组合设计 有限抽象集 映射 计数法则 计数公式 组合恒等式
下载PDF
A flexible lag definition for experimental variogram calculation 被引量:3
3
作者 Cuba Miguel 《Mining Science and Technology》 EI CAS 2011年第2期207-211,共5页
Inferring the experimental variogram used in geostatistics commonly relies on the method-of-moments approach.Ideally,the available data-set used for calculating the experimental variogram should be drawn from a regula... Inferring the experimental variogram used in geostatistics commonly relies on the method-of-moments approach.Ideally,the available data-set used for calculating the experimental variogram should be drawn from a regular pattern.However,in practice the available data-set is typically sampled over a sparse pattern at irregularly spaced locations.Hence,some binning of the variogram cloud is required to obtain fair estimates of the experimental variogram.Grouping of the variogram data pairs as a result of conventional binning depends on parameters such as the main anisotropic directions and a regular definition of the lag vectors.These parameters are not based on the configuration of the variogram data pairs in the variogram cloud but on a segment of it that is arbitrarily predefined.Therefore,the conventional experimental variogram estimation approach is biased because of the strict configuration of the bins over the variogram cloud.In this paper,a new method of estimating experimental variograms is proposed.Lag vectors and their tolerances are decided in the proposed method from information in the variogram cloud:they are not influenced by any predefined directions.The proposed methodology is a well-founded,practicable and easy-to-automate approach for experimental variogram calculation using an irregularly sampled data-set.Comparison of results from the new method to those from the traditional approach is very encouraging. 展开更多
关键词 GEOSTATISTICS Variogram cloud Experimental variogram Variogram modeling Self-organizing-map
下载PDF
Receiver Function Estimated by Wiener Filtering 被引量:4
4
作者 Wu Qingju, Tian Xiaobo, Zhang Nailing, Li Weiping and Zeng RongshengInstitute of Geophysics, China Seismological Bureau, Beijing 100081, China 《Earthquake Research in China》 2003年第4期386-391,共6页
Wiener filtering is used to estimate receiver function in a time_domain. With the vertical component of 3_component teleseismic P waveform as the input of a Wiener filter, receiver function as the filter response, and... Wiener filtering is used to estimate receiver function in a time_domain. With the vertical component of 3_component teleseismic P waveform as the input of a Wiener filter, receiver function as the filter response, and radial and tangential components as the expected output, receiver function is estimated by minimizing the error between expected and actual outputs. Receiver function can be obtained by solving the Toeplitz equation using the Levinson algorithm. The non_singularity of the Toeplitz equation ensures the stability of Wiener Deconvolution. Both synthetic and observational seismogram checks show that Wiener Deconvolution is an effective time_domain method to estimate receiver function from teleseismic P waveform. 展开更多
关键词 Receiver function Wiener filter Toeplitz equation Levinson algorithm
下载PDF
An Extension of Algorithm on Symbolic Computations of Conserved Densities for High-Dimensional Nonlinear Systems
5
作者 YANG Xu-Dong RUAN Hang-Yu LOU Sen-Yue 《Communications in Theoretical Physics》 SCIE CAS CSCD 2008年第7期23-30,共8页
An improved algorithm for symbolic computations of polynomial-type conservation laws (PCLaws) of ageneral polynomial nonlinear system is presented.The algorithm is implemented in Maple and can be successfully usedfor ... An improved algorithm for symbolic computations of polynomial-type conservation laws (PCLaws) of ageneral polynomial nonlinear system is presented.The algorithm is implemented in Maple and can be successfully usedfor high-dimensional models.Furthermore,the algorithm discards the restriction to evolution equations.The programcan also be used to determine the preferences for a given parameterized nonlinear systems.The code is tested on severalknown nonlinear equations from the soliton theory. 展开更多
关键词 conservation laws nonlinear systems computer algebra
下载PDF
3D structure parameterization design and modeling for irregular structure of stope bottom 被引量:3
6
作者 曾庆田 Wang Liguan 《High Technology Letters》 EI CAS 2016年第1期55-62,共8页
Stope mining design is a very important and complicated task in daily production design and technical management of an underground mine.Based on workface technology and human-computer interaction technology,this study... Stope mining design is a very important and complicated task in daily production design and technical management of an underground mine.Based on workface technology and human-computer interaction technology,this study introduces a method of 3D parametric design for the irregular structure of stope bottoms,and focuses on solving technical problems in surface modeling of stope bottom structure.Optimization of the minimum span length algorithm(MSLA) and the shortest path search algorithm(SPSA) is conducted to solve the problem of contour-line based instant modeling of stope bottom structures,which makes possible the 3D parametric design for irregular structure of stope bottom.Implementation process and relevant methods of the proposed algorithms are also presented.Feasibility and reliability of the proposed modeling method are testified in a case study.In practice,the proposed 3 D parameterization design method for irregular structure stope bottom proves to be very helpful to precise 3D parametric design.This method is capable of contributing to improved efficiency and precision of stope design,and is worthy of promotion. 展开更多
关键词 irregular stope bottom structure STOPE structure parameterization design surface reconstruction modeling
下载PDF
Underwater Acoustic Image Transmission System Based on DSF
7
作者 程恩 许茹 《Marine Science Bulletin》 2002年第1期27-33,共7页
The underwater acoustic image transmission system based on the high-speed DSP device TMS320C549 has been studied.We use Goertzel algorithm for source decoding and MFSK for modulation.Turbo code is used for channel cod... The underwater acoustic image transmission system based on the high-speed DSP device TMS320C549 has been studied.We use Goertzel algorithm for source decoding and MFSK for modulation.Turbo code is used for channel coding and decoding.The purpose is to implement underwater video image data transmission. 展开更多
关键词 underwater image transmission MFSK Goertzel algorithm Turbo code
下载PDF
Novel robust approach for constructing Mamdani-type fuzzy system based on PRM and subtractive clustering algorithm 被引量:1
8
作者 褚菲 马小平 +1 位作者 王福利 贾润达 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第7期2620-2628,共9页
A novel approach for constructing robust Mamdani fuzzy system was proposed, which consisted of an efficiency robust estimator(partial robust M-regression, PRM) in the parameter learning phase of the initial fuzzy syst... A novel approach for constructing robust Mamdani fuzzy system was proposed, which consisted of an efficiency robust estimator(partial robust M-regression, PRM) in the parameter learning phase of the initial fuzzy system, and an improved subtractive clustering algorithm in the fuzzy-rule-selecting phase. The weights obtained in PRM, which gives protection against noise and outliers, were incorporated into the potential measure of the subtractive cluster algorithm to enhance the robustness of the fuzzy rule cluster process, and a compact Mamdani-type fuzzy system was established after the parameters in the consequent parts of rules were re-estimated by partial least squares(PLS). The main characteristics of the new approach were its simplicity and ability to construct fuzzy system fast and robustly. Simulation and experiment results show that the proposed approach can achieve satisfactory results in various kinds of data domains with noise and outliers. Compared with D-SVD and ARRBFN, the proposed approach yields much fewer rules and less RMSE values. 展开更多
关键词 Mamdani-type fuzzy system robust system subtractive clustering algorithm outlier partial robust M-regression
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部