A Method of Adaptive Fuzzy Classfication on Rockmass Blast Ability     

Ye Xiaoming Liu Dongyan 《保鲜与加工》1997,(2):12-20

This paper presents a series of targets which are usefull for engineering.The paper also presents an adaptive weight function according to the fail mechanism of rockmass and a fuzzy aynthetic evaluation medel on rockmass blast ability.The model is applied to evaluate the blast ability of rockmass in an engineering and the result shows that the model is effective.  相似文献   

A Globally Convergent Algorithm for Nonlinear Programming     

Zhao Yunbin Duan Yurong 《保鲜与加工》1993,(5):125-130

A new globally convergent algorithm was presented for a continuous differen-tiable nonlinear programming by defining a measure function deviating from the Kuhn-Tucker point. With this algorithm which can be used to get the optimum solution of the problem,the optimal lagrangian multiplier corresponding the optimal solution of the problem was also obtained. A new iterative algorithm for quadratic programming is obtained when applying the general algorithm to quadratic programming. Finally,a numerical example was given.  相似文献   

Spline Boundary Element Method for Calculating Three-Dimensional Electrostatic Fields     

Yun Zhengqing Tan Bangding 《保鲜与加工》1993,(5):79-84

Based on [l].this paper presents a new spline-BEM for calculating 3-D electrostatic fields,in which bi-cubic B-splines are used as basis functions. The corner problem in BEM and the extreme conditions for splines are circumvented. The numerical results presented show that the global approximation .convergence and stability of the method are satisfactory.  相似文献   

THE FULL LOADING HISTORY ANALYSTS OF PRESTRESSED CONCRETE GRIDS WITH UNBONDED TENDONS     

Wang Zhenglin Chen Benxian 《保鲜与加工》1988,(2)

This paper presents a matrix structural analysis of variable stiffness on the complete loading history of prestressed concrete grids with unbonded tendons. A model of torsional rigidity affected by moment is derived by the analogy of space truss, and the effect of torque on flexural rigidity is also studied. In order to calculate the increment of stresses in tendons, a corresponding equation is created. Comparison of calculation shows well agreement with the experimental results.  相似文献   

Some Problems about the Implementation of One dimensional Mallat Algorithm     

Xu Mintao Qin Shuren Chen Zhikui Yang Changqi 《保鲜与加工》1997,(1):7-13

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THE ARC-LENGTH METHOD OF SECANT RIGIDITY IN FRAME ANALYSIS     

Wang Yongyue 《保鲜与加工》1996,(1):27-31

The secant rigidity is used for the are-length method to solve the nonlinear finite elements problems. The advantage of this method is unnecessary of calculating the initial resistance term caused by the incremental step. The computational work is less and the programing is easier as compared with initial are-length method. This method can be widely used to solve nonlinear problems.  相似文献   

FINITE ELEMENT PREDICTION OF THE PERFORMANCE OF AN INSTRUCMENTED GEOTEXTILE-REINFORCED WALL     

Peng Shusheng 《保鲜与加工》1995,(3):85-95

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直墙拱形巷道围岩应力场分析     

唐治  潘一山  朱小景  崔乃鑫 《保鲜与加工》2015,(3):79-85

为得出直墙拱形巷道围岩应力分布规律,应用复变函数弹性理论推导了直墙拱形巷道围岩应力分布的解析表达式。对直墙拱形巷道边界的围岩应力和巷道水平线方向的围岩应力分布规律进行分析,并考虑直墙拱形巷道断面高宽比和侧压系数对其影响规律。研究表明：在不同巷道断面高宽比、侧压系数下,直墙拱形巷道围岩应力集中区域主要集中在直墙底部底角处、拱形顶板中点附近和底板中部3个位置。不同巷道断面高宽比下,直墙拱形巷道沿水平线的应力分布规律基本相同。侧压系数大于1时,采用巷道断面高宽比小于1较有利于巷道稳定;侧压系数小于等于1时,采用巷道断面高宽比大于1较有利于巷道稳定。  相似文献   

Matter-element Evaluation Model on the Personal Credit of University Students Loan and It''s Application     

SHI Wei-ren  LIN Yin-hu  ZHANG Wan-li  ZHANG Li 《保鲜与加工》2005,(9):64

This paper analyzes the current situation of university students' credit evaluation and set up an evaluation index system of university students' credit to compensate a loan.Based on this index system,this paper sets up a matter-element evaluation model on the individual credit of university students loan by means of extensible engineering method.The grade of individual credit and the index for evaluating the level of individual credit are made as matter-element,meanwhile,the classical field,the segment field,the weight coefficient are obtained.Dependence function is established based on the grade of individual credit and then the grade is judged by calculating the synthetic dependence degree.Finally,this paper presents the evaluation method by giving an example.This method is simple in calculation,reasonable in evaluation with high applicability.  相似文献   

Primary Study of Applicability of Plane-section Assumption of Shaped RC Columns     

HU Xiao-bin  HUANG Zong-ming  CHEN Min-di 《保鲜与加工》2004,(3):26-31

Adopting the element SOLID65 and LINK8 in the general finite element analysis software ANSYS and fiber model beam-column element based on finite element flexibility method respectively, the comparative analysis of the cross, L and T-shaped RC columns under compression, bending, shear and torsion with flange width-thickness ratio of 4:1 is carried out. The applicability of plane section assumption in the nonlinear analysis is discussed primarily, which shows that it is feasible on the whole for shaped RC columns with flange width-thickness ratio equal to or smaller than 4:1.  相似文献