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A fast amplitude preserving three-parameter 3D parabolic Radon transform and its application on multiple attenuation 认领 引用 被引量：2
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作者 Ji-Tao Ma Kai-Ge Zhao Zhen Liao 《Petroleum Science》 SCIE EI CAS CSCD 2025年第1期163-177,共15页
Seismic wavefields propagate through three-dimensional(3D)space,and their precise characterization is crucial for understanding subsurface structures.Traditional 2D algorithms,due to their limitations,are insufficient... Seismic wavefields propagate through three-dimensional(3D)space,and their precise characterization is crucial for understanding subsurface structures.Traditional 2D algorithms,due to their limitations,are insufficient to fully represent three-dimensional wavefields.The classic 3D Radon transform algorithm assumes that the wavefield's propagation characteristics are consistent in all directions,which often does not hold true in complex underground media.To address this issue,we present an improved 3D three-parameter Radon algorithm that considers the wavefield variation with azimuth and provides a more accurate wavefield description.However,introducing new parameters to describe the azimuthal varia-tion also poses computational challenges.The new Radon transform operator involves five variables and cannot be simply decomposed into small matrices for efficient computation;instead,it requires large matrix multiplication and inversion operations,significantly increasing the computational load.To overcome this challenge,we have integrated the curvature and frequency parameters,simplifying all frequency operators to the same,thereby significantly improving computation efficiency.Furthermore,existing transform algorithms neglect the lateral variation of seismic amplitudes,leading to discrepancies between the estimated multiples and those in the data.To enhance the amplitude preservation of the algorithm,we employ orthogonal polynomial fitting to capture the amplitude spatial variation in 3D seismic data.Combining these improvements,we propose a fast,amplitude-preserving,3D three-parameter Radon transform algorithm.This algorithm not only enhances computational efficiency while maintaining the original wavefield characteristics,but also improves the representation of seismic data by increasing amplitude fidelity.We validated the algorithm in multiple attenuation using both synthetic and real seismic data.The results demonstrate that the new algorithm significantly improves both accuracy and computational efficiency,providing an effective tool for analyzing seismic wavefields in complex subsurface structures. 展开更多
关键词 Three-parameter 3D Radon Orthogonal polynomial Amplitude-preserving Multiple attenuation
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A three-parameter single-step time integration method for structural dynamic analysis 认领 引用 被引量：8
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作者 Huimin Zhang Yufeng Xing 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2019年第1期112-128,I0004,共17页
The existing three-parameter single-step time integration methods, such as the Generalized-a method, improve numerical dissipation by modifying equilibrium equation at time points, which cause them to lose accuracy du... The existing three-parameter single-step time integration methods, such as the Generalized-a method, improve numerical dissipation by modifying equilibrium equation at time points, which cause them to lose accuracy due to the interpolation of load vectors. Moreover, these three-parameter methods do not present an available formulation applied to a general secondorder non linear differential equatio n. To solve these problems, this paper proposes an innovative three-parameter single-step method by introducing an additional variable into update equations. Although the present method is spectrally identical to the Generalized-cx method for undamped systems, it possesses higher accuracy since it strictly satisfies the equilibrium equation at time points, and can be readily used to solve nonlinear equations. By the analysis of accuracy, stability, numerical dissipation and dispersion, the optimal second-order implicit and explicit schemes are generated, which can maximize low-frequency accuracy when high-frequency dissipation is specified. To check the performance of the proposed method, several numerical experiments are conducted and the proposed method is compared with a few up-to-date methods. 展开更多
关键词 Three-parameter Single-step Optimal scheme Higher accuracy
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A Novel Three-parameter Flow Cytometric Analysis for Cell Cycle 认领 引用 被引量：5
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作者 冯永东 陶德定 +5 位作者 覃吉超 高纯 申漫里 冷艳 余源 龚建平 《The Chinese-German Journal of Clinical Oncology》 2005年第2期76-82,共7页
To set up a three-parameter method for cell cycle analysis by two-laser flowcy-tometer, which can detect two types of cyclin plus DNA content in one measurement, and thatanalyze unscheduled expression of cyclins. Meth... To set up a three-parameter method for cell cycle analysis by two-laser flowcy-tometer, which can detect two types of cyclin plus DNA content in one measurement, and thatanalyze unscheduled expression of cyclins. Methods: Three-color fluorescence was used for analysisof two types of cyclins and DNA content simultaneously in individual cells by two-laser flowcytometry. MOLT-4 cells were used to study the expression of major cyclins in mammalian cells. ATriton-X100 permeabilization procedure was optimized for detection of two types of cyclins. Onecyclin was stained directly with a FITC-conjugated monoclonal antibody (mAb), and the other,indirectly with RPE-Cy5-conjugated secondary antibody, while DNA was stained with the fluorochromeDAPI. mAMSA and mimosine treated MOLT-4 cells were used to test this three-parameter method.Results: Permeabilization with 0.5% Triton-XlOO in PBS containing 1% BSA for 5 min on ice providedoptimal conditions for the simultaneous labelling of two cyclins plus DNA in single cells. It wasfound that the emission spectrum of the three dyes (DAPI, FITC and RPE-Cy5) could be measured withno compensation. Based on cyclinA/cyclinE/DNA flow cytometric analysis, asynchronously growingMOLT-4 cells could be divided into 6 compartments (G1o, G1e, G1l, S, G2, and M) simultaneously,allowing for analysis of cell cycle phase specific perturbations without the necessity of cellsynchronization. Unscheduled cyclin B1 expression was observed in G1 cells treated with mimosine andcyclin E in G2 cells treated with mAMSA. We found that unscheduled cyclin expression paralleledexpected cyclin expression. Conclusion: Thus, three-color FCM analysis of cells may not only beapplied to measure unscheduled vs. expected cyclin expression but may also be used to estimate thefraction of cycling cells in up to 6 cell populations. 展开更多
关键词 cell cycle flow cytometry cyclin three-parameter analysis
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Lithium-ion cell inconsistency analysis based on three-parameter Weibull probability model 认领 引用 被引量：3
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作者 Lin-Shu Wang Yan-Yan Fang +4 位作者 Ting Zhao Jian-Tao Wang Hang Zhang Lin Wang Shi-Gang Lu 《Rare Metals》 SCIE EI CAS CSCD 2020年第4期392-401,共10页
The inconsistency of lithium-ion cells degrades battery performance,lifetime and even safety.The complexity of the cell reaction mechanism causes an irregular asymmetrical distribution of various cell parameters,such ... The inconsistency of lithium-ion cells degrades battery performance,lifetime and even safety.The complexity of the cell reaction mechanism causes an irregular asymmetrical distribution of various cell parameters,such as capacity and internal resistance,among others.In this study,the Newman electrochemical model was used to simulate the 1 C discharge curves of 100 LiMn2 O4 pouch cells with parameter variations typically produced in manufacturing processes,and the three-parameter Weibull probability model was used to analyze the dispersion and symmetry of the resulting discharge voltage distributions.The results showed that the dispersion of the voltage distribution was related to the rate of decrease in the discharge voltage,and the symmetry was related to the change in the rate of voltage decrease.The effect of the cells’capacity dominated the voltage distribution thermodynamically during discharge,and the phase transformation process significantly skewed the voltage distribution.The effects of the ohmic drop and polarization voltage on the voltage distribution were primarily kinetic.The presence of current returned the right-skewed voltage distribution caused by phase transformation to a more symmetrical distribution.Thus,the Weibull parameters elucidated the electrochemical behavior during the discharge process,and this method can guide the prediction and control of cell inconsistency,as well as detection and control strategies for cell management systems. 展开更多
关键词 Lithium-ion cell Voltage inconsistency evolution Three-parameter Weibull probability model Dispersion and symmetry of voltage distribution Thermodynamic inconsistency Kinetic inconsistency
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Two Probability Plots of the Three-Parameter Lognormal Distribution 认领 引用 被引量：1
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作者 蒋仁言 《Journal of Donghua University(English Edition)》 EI CAS 2014年第6期757-759,共3页
The two-parameter lognormal distribution is a variant of the normal distribution and the three-parameter lognormal distribution is an extension of the two-parameter lognormal distribution by introducing a location par... The two-parameter lognormal distribution is a variant of the normal distribution and the three-parameter lognormal distribution is an extension of the two-parameter lognormal distribution by introducing a location parameter. The Q-Q plot of the three-parameter lognormal distribution is widely used. To obtain the Q-Q plot one needs to iteratively try different values of the shape parameter and subjectively judge the linearity of the Q-Q plot. In this paper,a mathematical method was proposed to determine the value of the shape parameter so as to simplify the generation of the Q-Q plot. Then a new probability plot was proposed,which was more easily obtained and provided more accurate parameter estimates than the Q-Q plot. These are illustrated by three realworld examples. 展开更多
关键词 three-parameter lognormal distribution probability plot correlation coefficient model selection parameter estimation
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Selection Method of Evaluation Indicators with Three-Parameter Interval Grey Number 认领 引用 被引量：2
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作者 Fanlin Meng Na Wang Bingjun Li 《Open Journal of Applied Sciences》 2015年第12期833-840,共8页
The evaluation problem with three-parameter interval grey number (T-PIGN) widely exists in real world. To select effective evaluation indicators of the problem, this paper puts forward evaluation index system selectio... The evaluation problem with three-parameter interval grey number (T-PIGN) widely exists in real world. To select effective evaluation indicators of the problem, this paper puts forward evaluation index system selection principle of T-PIGN based on distance entropy model, and gives out evaluation index system selection judgment criterion of T-PIGN. Furthermore, for the redundancy of evaluation index system with T-PIGN, a selection method of evaluation index system with T-PIGN is proposed. Finally, the applicability of the proposed method is verified by concrete examples. 展开更多
关键词 Evaluation Indicators Selection Three-Parameter Interval Grey Number Grey Distance Entropy
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Study on Prediction Method of Structural Three-parameter Power Function P-S-N Curve 认领 引用
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作者 LIU Yujie DAI Zongmiao 《International Journal of Plant Engineering and Management》 2018年第2期65-70,共6页
This paper applies weighted least square method to estimate the three-parameter power function equation of the fatigue life curve, and uses comprehensive fatigue life coefficient to correct the equation, and at the sa... This paper applies weighted least square method to estimate the three-parameter power function equation of the fatigue life curve, and uses comprehensive fatigue life coefficient to correct the equation, and at the same time combines probability statistics method to bring out the prediction method of structure＇s three- parameter power function P-S-N curve, finally applies the prediction method to a ship＇s frame-type elevate, based on the fatigue test data of it＇s material-SA06 aluminium alloy, to obtain it＇s structure＇s three-parameter power function P-S-N curve. Compared with the conventional least square method, the presented method can give 展开更多
关键词 P-S-N curve comprehensive fatigue life coefficient three-parameter power function fatigue life
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An Optimal Policy with Quadratic Demand, Three-Parameter Weibull Distribution Deterioration Rate, Shortages and Salvage Value 认领 引用
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作者 Pandit Jagatananda Mishra Trailokyanath Singh Hadibandhu Pattanayak 《American Journal of Computational Mathematics》 2016年第3期200-211,共12页
The present paper focuses an optimal policy of an inventory model for deteriorating items with generalized demand rate and deterioration rate. Shortages are allowed and partially backlogged. The salvage value is inclu... The present paper focuses an optimal policy of an inventory model for deteriorating items with generalized demand rate and deterioration rate. Shortages are allowed and partially backlogged. The salvage value is included into deteriorated units. The main objective of the model is to minimize the total cost by optimizing the value of the shortage point, cycle length and order quantity. A numerical example is carried out to illustrate the model and sensitivity analyses of major parameters are discussed. 展开更多
关键词 EOQ Quadratic Demand Salvage Value Shortage Three-Parameter Weibull Deterioration Rate
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Three-parameter approximations of sums of locally dependent random variables via Stein's method 认领 引用
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作者 Zhonggen Su Xiaolin Wang 《Science China Mathematics》 SCIE CSCD 2025年第3期677-706,共30页
Let{Xi,i∈J}be a family of locally dependent non-negative integer-valued random variables with finite expectations and variances.We consider the sum W=∑i∈JXiand apply Stein's method to establish general up... Let{Xi,i∈J}be a family of locally dependent non-negative integer-valued random variables with finite expectations and variances.We consider the sum W=∑i∈JXiand apply Stein's method to establish general upper error bounds for the total variation distance dTV(W,M),where M represents a threeparameter random variable.As a direct consequence,we obtain a discretized normal approximation for W.As applications,we study four well-known examples in detail:counting vertices where all edges point inward,the birthday problem,counting monochromatic edges in uniformly colored graphs,and triangles in the Erdos-Rényi random graph.Through delicate analysis and computation,we obtain sharper upper error bounds than existing results. 展开更多
关键词 Eros-Rényi random graph local dependence monochromatic edge Stein's method three-parameter distribution
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Dynamic Multi-Attribute Decision Analysis on Three-Parameter Interval Grey Number of Upper(Lower)Deviation Quasi-Normal Distribution 认领 引用 被引量：3
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作者 Fenyi DONG Linlin WU Han SHEN 《Journal of Systems Science and Information》 CSCD 2022年第3期280-296,共17页
Aiming at the dynamic multi-attribute decision making problem where the weight of each decision stage and attribute weight are completely unknown and the attribute value is unknown distributed three-parameter interval... Aiming at the dynamic multi-attribute decision making problem where the weight of each decision stage and attribute weight are completely unknown and the attribute value is unknown distributed three-parameter interval grey number,a threeparameter interval grey number dynamic multiattribute grey target decision making method with attribute value following quasi-normal distribution is proposed.Firstly,the position relationship between the“center of gravity”point and the kernel of the threeparameter interval grey number is discussed.According to the characteristicthat the attribute value obeys the quasi-normal distribution,anew weight isgiventothe“centerof gravity”point,and a new distance measure formula of the three-parameter interval grey number is defined.Secondly,according to the principle of maximum entropy,the objective programming model is constructed to determine the stage weight and attributeweight.Then,the schemes aresorted according to thesize of the comprehensive bull's-eye distance Finally an example is given to illustrate the effectiveness of the decision model. 展开更多
关键词 three-parameter interval grey number grey target decision making quasi-normal distribution multiple attribute decision making
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Hypothesis testing for reliability with a three-parameter Weibull distribution using minimum weighted relative entropy norm and bootstrap 认领 引用 被引量：2
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作者 Xin-tao XIA Yin-ping JIN +2 位作者 Yong-zhi XU Yan-tao SHANG Long CHEN 《Journal of Zhejiang University-Science C(Computers and Electronics)》 2013年第2期143-154,共12页
With the help of relative entropy theory,norm theory,and bootstrap methodology,a new hypothesis testing method is proposed to verify reliability with a three-parameter Weibull distribution.Based on the relative differ... With the help of relative entropy theory,norm theory,and bootstrap methodology,a new hypothesis testing method is proposed to verify reliability with a three-parameter Weibull distribution.Based on the relative difference information of the experimental value vector to the theoretical value vector of reliability,six criteria of the minimum weighted relative entropy norm are established to extract the optimal information vector of the Weibull parameters in the reliability experiment of product lifetime.The rejection region used in the hypothesis testing is deduced via the area of intersection set of the estimated truth-value function and its confidence interval function of the three-parameter Weibull distribution.The case studies of simulation lifetime,helicopter component failure,and ceramic material failure indicate that the proposed method is able to reflect the practical situation of the reliability experiment. 展开更多
关键词 Reliability Hypothesis testing Three-parameter Weibull distribution Weighted relative entropy Norm Bootstrap
基于方差分量估计的GB-InSAR三维形变解算方法 认领 引用
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作者 白泽朝 王萱 +1 位作者 王彦平 余快 《华中科技大学学报（自然科学版）》 EI CAS CSCD 北大核心 2026年第3期79-84,共6页
针对基于最小二乘的地基合成孔径雷达干涉测量(GB-InSAR)三维形变解算方法没有顾及形变的连续性和不同雷达数据之间的测量误差差异的问题,提出了基于方差分量估计的参数化最小二乘(Para-LSQ-VCE)GB-InSAR三维形变解算方法,对不同角度雷... 针对基于最小二乘的地基合成孔径雷达干涉测量(GB-InSAR)三维形变解算方法没有顾及形变的连续性和不同雷达数据之间的测量误差差异的问题,提出了基于方差分量估计的参数化最小二乘(Para-LSQ-VCE)GB-InSAR三维形变解算方法,对不同角度雷达获取的一维视线向形变观测矩阵,构建参数矩阵使解算形变连续平滑,并进行选权迭代,精确分配权重,进而提高三维形变解算精度.实验结果表明:在仿真实验中,相比于最小二乘方法,方差分量估计参数化最小二乘方法最高可提升91.12%的三维形变解算精度;在实测实验中,方差分量估计参数化最小二乘方法可提升86.67%的三维形变解算精度.本文方法提升了GB-InSAR三维形变监测的精度,对推动GB-InSAR在精密测量领域的应用具有重要理论意义与应用价值. 展开更多
关键词 GB-InSAR 三维形变解算 参数化最小二乘 方差分量估计 雷达
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基于Inventor的尾矿库框架井三维建模方法 认领 引用
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作者 侯攀 陈宇清 +2 位作者 田文高 王明明 黄粤鑫 《有色矿冶》 2026年第1期55-58,共4页
针对尾矿库设计人员绘图需求,利用VB和Inventor开发了三维建模系统软件,实现了尾矿库框架式排水三维建模参数化设计。该系统采用交互式对话框方式输入设计参数,排水井三维模型生成过程及成果输出过程均为自动化,大幅提高设计人员工作效... 针对尾矿库设计人员绘图需求,利用VB和Inventor开发了三维建模系统软件,实现了尾矿库框架式排水三维建模参数化设计。该系统采用交互式对话框方式输入设计参数,排水井三维模型生成过程及成果输出过程均为自动化,大幅提高设计人员工作效率。通过工程实例,验证了系统的高效性和实用性。 展开更多
关键词 尾矿库 框架式排水井 参数化 成果输出 三维建模
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Application of scattering image wavelet transform in cave recognition:A case study on a bedrock buried hill reservoir in Bongor Basin,Chad 认领 引用
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作者 XiaoYu-Jiang Tao Song +4 位作者 Li-Deng Gan Yan Zhang Wen-Hui Du Xing-Yan Fan Xiao-FengDai 《Applied Geophysics》 SCIE CSCD 2025年第2期535-545,561,共11页
Caves located in the buried hill reservoir of granite bedrock in Bongor Basin,Chad,are excessively small and cannot be identifi ed in conventional refl ection wave imaging profi les because their refl ection character... Caves located in the buried hill reservoir of granite bedrock in Bongor Basin,Chad,are excessively small and cannot be identifi ed in conventional refl ection wave imaging profi les because their refl ection characteristics are suppressed by the strong refl ection of the weathering crust at the top of the buried hill.In contrast to refl ection wave imaging,which refl ects the refl ection characteristics of continuous interfaces,scattered wave imaging refl ects the reflection characteristics of discontinuous geological bodies.Scattering waves can be produced in the presence of discontinuous points,such as karst caves,fractures,and stratum vanishing points.Scattering imaging can accurately provide the location of discontinuous abnormal bodies,highlight the seismic reflection characteristics of caves with weak reflections,and eliminate continuous strong reflections to strengthen the ability of seismic data to distinguish discontinuous geological bodies and solve the inability of seismic data from conventional poststack refl ection wave imaging to identify small caves in buried hills.Three-parameter wavelet spectral decomposition technology is used to depict the boundary of caves accurately in accordance with the strong energy spectral characteristics of caves in the section of the scattering imaging seismic data of the granite bedrock buried hill reservoir.Compared with the attributes extracted from conventional refl ection wave poststack seismic data,those acquired from scattering imaging bodies are more reliable and consistent with the actual location of caves on boreholes and have higher resolution.For connected wells,the attributes extracted from the conventional poststack seismic data can only predict whether caves are developed,whereas those calculated from scattering imaging can not only predict whether caves are present but also refl ects the degree of cave development.On the plane,the attributes obtained from scattering imaging calculation are more consistent with the geological law of cave development.On the basis of this fi nding and in accordance with the results of the three-parameter wavelet spectral decomposition of scattering imaging seismic data,the degree of cave development is classifi ed,and the favorable location for reservoir development in the study area is identifi ed.This solution provides an eff ective way to improve the exploration accuracy of cave-type granite buried hill reservoirs. 展开更多
关键词 Angle domain imaging Scattering imaging Granite bedrock buried hill Three-parameter wavelet Cave
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集装箱船导轨AutoCAD软件参数化设计方法 认领 引用
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作者 邬旭东 刘金鑫 《造船技术》 2026年第3期18-21,72,共4页
针对在集装箱船导轨设计过程中传统二维绘图方法与计算机辅助三维交互式应用(Computer Aided Three-Dimensional Interactive Application,CATIA)软件设计方法的不足,提出一种AutoCAD软件参数化设计方法。基于AutoCAD软件平台,使用动态... 针对在集装箱船导轨设计过程中传统二维绘图方法与计算机辅助三维交互式应用(Computer Aided Three-Dimensional Interactive Application,CATIA)软件设计方法的不足,提出一种AutoCAD软件参数化设计方法。基于AutoCAD软件平台,使用动态块创建参数化零件库,将块属性与材料表进行关联,并采用二次开发编程生成材料表。设计效果对比表明,AutoCAD软件参数化设计方法可有效降低集装箱船导轨的设计门槛并大幅提升设计效率。 展开更多
关键词 集装箱船导轨 AutoCAD软件参数化设计方法 计算机辅助三维交互式应用软件设计方法 动态块 块属性 二次开发 材料表
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基于参数化设计的熔融挤压快速成型3D打印织物 认领 引用 被引量：1
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作者 徐琳琳 陈奕文 《毛纺科技》 CAS 北大核心 2025年第1期41-47,共7页
针对3D打印织物表面存在单丝压缩性能差的问题,利用熔融挤压快速成型打印技术对织物表面进行设计应用。以常见的几何形体为基础元素,运用三维参数化方式处理织物表面形体结构,利用熔融挤压快速成型技术制备织物单丝,并设计三维立体织物... 针对3D打印织物表面存在单丝压缩性能差的问题,利用熔融挤压快速成型打印技术对织物表面进行设计应用。以常见的几何形体为基础元素,运用三维参数化方式处理织物表面形体结构,利用熔融挤压快速成型技术制备织物单丝,并设计三维立体织物表面形体参数;通过控制打印材料的挤出速度以匹配出丝速度与填充速度,实现织物表面立体设计;并与熔融层积成型技术、选择性激光烧结(SLS)2种3D打印技术进行对比分析。实验结果表明:经参数化设计后,熔融挤压快速成型3D打印技术显著提高了织物单丝的压缩性能,同时强化了织物表面质量,极大提高了3D打印织物的便利性。 展开更多
关键词 熔融挤压快速成型 3D打印技术 织物表面设计 立体设计 元素参数化
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3-D consistency dynamic constitutive model of concrete 认领 引用 被引量：4
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作者 Xiao Shiyun Li Hongnan Lin Gao 《Earthquake Engineering and Engineering Vibration》 SCIE EI 2010年第2期233-246,共14页
Based on the consistency-viscoplastic constitutive model,the static William-Warnke model with three-parameters is modified and a consistency-viscoplastic William-Warnke model with three-parameters is developed that co... Based on the consistency-viscoplastic constitutive model,the static William-Warnke model with three-parameters is modified and a consistency-viscoplastic William-Warnke model with three-parameters is developed that considers the effect of strain rates.Then,the tangent modulus of the consistency viscoplastic model is introduced and an implicit backward Elure iterative algorithm is developed.Comparisons between the numerical simulations and experimental data show that the consistency model properly provides the uniaxial and biaxial dynamic behaviors of concrete.To study the effect of strain rates on the dynamic response of concrete structures,the proposed model is used in the analysis of the dynamic response of a simply-supported beam and the results show that the strain rate has a significant effect on the displacement and stress magnitudes and distributions.Finally,the seismic responses of a 278 m high arch dam are obtained and compared by using the linear elastic model,as well as rate-independent and rate-dependent William-Warnke three-parameter models.The results indicate that the strain rate affects the first principal stresses,and the maximal equivalent viscoplastic strain rate of the arch dam.Numerical calculations and analyses reveal that considering the strain rate is important in the safety assessments of arch dams located in seismically active areas. 展开更多
关键词 concrete strain rate constitutive model consistency-viscoplastic William-Warnke three-parameter model algorithm arch dams seismic responsesimulation
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On the Loads for Strength Design of Cutterhead of Full Face Rock Tunnel Boring Machine 认领 引用 被引量：2
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作者 Meidong Han Zongxi Cai Chuanyong Qu 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2019年第6期60-71,共12页
Cutterhead loads are the key mechanical parameters for the strength design of the full face hard rock tunnel boring machine(TBM).Due to the brittle rock-breaking mechanism,the excavation loads acting on cutters fluctu... Cutterhead loads are the key mechanical parameters for the strength design of the full face hard rock tunnel boring machine(TBM).Due to the brittle rock-breaking mechanism,the excavation loads acting on cutters fluctuate strongly and show some randomness.The conventional method that using combinations of some special static loads to perform the strength design of TBM cutterhead may lead to strength failure during working practice.In this paper,a three-dimensional finite element model for coupled Cutterhead–Rock is developed to determine the cutterhead loads.Then the distribution characteristics and the influence factors of cutterhead loads are analyzed based on the numerical results.It is found that,as time changes,the normal and tangential forces acting on cutters and the total torque acting on the cutterhead approximately distribute log normally,while the total thrusts acting on the cutterhead approximately show a normal distribution.Furthermore,the statistical average values of cutterhead loads are proportional to the uniaxial compressive strength(UCS)of cutting rocks.The values also change with the penetration and the diameter of cutterhead following a power function.Based on these findings,we propose a three-parameter model for the mean of cutterhead loads and a method of generating the random cutter forces.Then the strength properties of a typical cutterhead are analyzed in detail using loads generated by the new method.The optimized cutterhead has been successfully applied in engineering.The method in this paper may provide a useful reference for the strength design of TBM cutterhead. 展开更多
关键词 TBM cutterhead Strength design Numerical simulation Three-parameter model Random cutter forces
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Influence of Active Control Strategy on the Motion Compensation at the Truncated Point of Mooring Line 认领 引用 被引量：1
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作者 QIAO Dong-sheng YIN Li +4 位作者 YAN Jun TANG Wei NING De-zhi LI Bin-bin OUJin-ping 《China Ocean Engineering》 SCIE EI CSCD 2021年第5期700-711,共12页
The maximum predicting error of the commonly used passive truncated mooring system method may reach 30%due to the difference of dynamic characteristics between the truncated and full-depth mooring line.In this paper,t... The maximum predicting error of the commonly used passive truncated mooring system method may reach 30%due to the difference of dynamic characteristics between the truncated and full-depth mooring line.In this paper,the experimental strategy called three-parameter(displacement,velocity and acceleration)active control method at the truncated point of mooring line is established to implement the synchronous equivalent of motion and force,and the realization of active truncated mooring system for model test is studied theoretically.The influences of threeparameter and one-parameter(displacement)active control strategies on the compensation effects are compared by numerical study.The results show that the established three-parameter active control method can feasibly realize the static and dynamic equivalent of truncated and full-depth mooring system,laying a good foundation for the following physical model test of active truncated mooring system. 展开更多
关键词 mooring system active truncated model test three-parameter control method motion and force equivalence
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Multi-strategy Hybrid Coati Optimizer:A Case Study of Prediction of Average Daily Electricity Consumption in China 认领 引用
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作者 Gang Hu Sa Wang Essam H.Houssein 《Journal of Bionic Engineering》 SCIE EI CSCD 2024年第5期2540-2568,共29页
The power sector is an important factor in ensuring the development of the national economy.Scientific simulation and prediction of power consumption help achieve the balance between power generation and power consump... The power sector is an important factor in ensuring the development of the national economy.Scientific simulation and prediction of power consumption help achieve the balance between power generation and power consumption.In this paper,a Multi-strategy Hybrid Coati Optimizer(MCOA)is used to optimize the parameters of the three-parameter combinatorial optimization model TDGM(1,1,r,ξ,Csz)to realize the simulation and prediction of China's daily electricity consumption.Firstly,a novel MCOA is proposed in this paper,by making the following improvements to the Coati Optimization Algorithm(COA):(ⅰ)Introduce improved circle chaotic mapping strategy.(ⅱ)Fusing Aquila Optimizer,to enhance MCOA's exploration capabilities.(ⅲ)Adopt an adaptive optimal neighborhood jitter learning strategy.Effectively improve MCOA escape from local optimal solutions.(ⅳ)Incorporating Differential Evolution to enhance the diversity of the population.Secondly,the superiority of the MCOA algorithm is verified by comparing it with the newly proposed algorithm,the improved optimiza-tion algorithm,and the hybrid algorithm on the CEC2019 and CEC2020 test sets.Finally,in this paper,MCOA is used to optimize the parameters of TDGM(1,1,r,ξ,Csz),and this model is applied to forecast the daily electricity consumption in China and compared with the predictions of 14 models,including seven intelligent algorithm-optimized TDGM(1,1,r,ξ,Csz),and seven forecasting models.The experimental results show that the error of the proposed method is minimized,which verifies the validity of the proposed method. 展开更多
关键词 Forecast of average daily electricity consumption in China Coati optimization algorithm Three-parameter combination optimization model Circle chaotic mapping
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