Development of Assembly-Type RC Structure and Building Industrialization     

YAN Wei  CAO Yong-hong  LI Guo-rong 《保鲜与加工》2004,(5):131-136

Based on the analysis of the status of building construction in China, the development of Assembled Structure System (ASS) can solve not only the problems in construction, but also is the key for realization of building industrialization. On the basis of technique innovations, a study on the structural performance, construction method and precast production of ASS should be carried out to inherit the old one and overcome its demerits. The process reengineering should be done in the construction enterprise to promote the development of building industrialization.  相似文献   

Weighting Coefficient Optimization Unification of Lexicographic Method in Fuzzy Multi -objective Optimization Design     

OU Wei  LYU En- lin 《保鲜与加工》2006,(3):56-58

The Lexicographic method has subjective and empirical character,so a weighting coefficient is introduced by considering the importance and proportion of each individual object,the preferable result of every individual object can be confirmed by comparing the degree of similarity between the perfect one and the ecumenic one and the Fuzzy optimization will be perfect.The effectiveness of these methods is illustrated by a fuzzy optimal design of the three-bar truss.  相似文献   

Synthetic Assessment of Power Transformer Condition Based on Matter-element Theory     

XlONG Hao  SUN Cai-xin  DU Peng  DAI Yao  WANG Qian 《保鲜与加工》2006,(10):24-28

Condition assessment on power transformer is an important approach to improve reliability of transformer and provide proper decision-making for condition-based maintenance. For long, static assessment method used in the past has already not adapted to the development of modem electricity transmission and distribution technology. So based on the deficiency of fuzzy synthetic assessment method, matter-element synthetic assessment method is introduced. The method can evaluate transformer condition not only in quality but also in quantity. Because each index weight can be given fairly and fast through improved analytic hierarchy process, which need not carry on consistency chec accuracy of assessment can be improved. Examples analysis has proved that assessment method of power transformer condition based on matter-element theory is rational and effective.  相似文献   

Study and Practice of Safety Grade Assessment for Large Convention and Exhibition Centre     

ZHOU Tie-jun  LIN Ling 《保鲜与加工》2007,(3):12

This paper takes "how to estimate the complex security of Large Convention and Exhibition Centre effectively" as the research goal.Based on analyzing the difficulties,target system,technical constitution,probing into the architecture,safety science,and using for reference the mathematics,operational research,statistics and modern system theory and method,trying to explore establishing an evaluation methodological system,which is provided with integrated characters on subject.Based on these ways,it exerts "quality to quantity" fuzzy analytical hierarchy process(FAHP) and aims at discussing the safety grade assessment of the Chongqing International Conference Exhibition Center focusing on designing theories.The aim is to enhance the integration of design practice and safe consciousness,strengthen the building safety management,and perfect city public security system.In practice,it is also an efficient tool for favoring values of architectural environmental safety.  相似文献   

四流T型中间包控流装置优化的水模拟分析     

陈登福  吕奎  谢鑫  龙木军  俞晟 《保鲜与加工》2015,(5):119-126

以某钢厂四流中间包为研究对象,根据相似原理建立了1∶3的物理模型。模型研究了不同结构的挡墙、导流孔和湍流抑制器对中间包内流动特性的影响。实验结果表明,“Y”型挡墙和梯形湍流抑制器(方案F)组合的控流装置能获得相对较优的实验结果。采用方案F的控流装置后,总体的死区比例从原型的23.69%降为8.02%,钢液能得到更为充分的混匀;各流平均停留时间的标准差从原型方案的23.56降低到7.34,各流一致性也得到了明显的改善。  相似文献   

The Generalized Conjugate Direction Method for Constrained Optimization A Geometrical Approech     

Yang Wannian  ZhangRenzhong 《保鲜与加工》1996,(6):1-8

The conjugate direction method for solving the unconstrained optimization problem is extended to solving the constrained optimization problem by method of differential geomtry.By inducing a new class of affine connections on a constrained sub-manifold, the primary constrched optilnhation problem is converted to a unconstrained local quadratic programming problem.Based on the definition and construction of a new class of generalized conjugate directions, it isproved that optimum value of the primary constrained optimization problem must be located on thegeodesic line which is formed by the conjugate directions mentioned above and can be reached withinfinite searching step. Therefore a new curve search algorithm with generalized conjugate directions isput forward.  相似文献   

A STUOY ON TNE POLICYMAKING MODEL OF INVEST IN THE INDUSTRIAL PROJECTS TO BE INUNDATED IN TNE RESERVIOR AREA OF THE THREE GORGES PROJECT     

Yanq Liu  Yan Wei  Zhou Yinhuo 《保鲜与加工》1995,(4):85-94

In combination with the migration of industrial projects to be in undated in thereservior area of The Three Gorges project, a level analysis apptoach is used to formulate a policy-making model of invest optimization for the projectS to be migrated,in which various kinds of influ-encial factor on the projects are presented quantitatively and the restriction of limited resourccs isconsidered; An effective,overall and aaplicablc policymaking approach is provided for the migrationof the Three Gorges project.  相似文献   

A Reactive Power OptimlZation Method by Linear Program ming with Secure Correction     

Zhao Youxin  Liu Lon grui 《保鲜与加工》1995,(1):51-54

This paper presents a reactive power optimization method which combines thelinear programming model with secure correction. In correction. this mOdel presents a new idea inwhich the feasible control region of con trol variables is resolved by over constrained state varlables. This method is quick and reliable and overcomes oscillation of a general linear programming model.  相似文献   

THEORETICAL INVESTIGATION AND PARAMETER OPTIMIZATION ON ROLLING CONE ENVELOPING HOURGLASS WORM GEARING     

Wang Jinge Zhang Ganghui 《保鲜与加工》1992,(2):58-64

In this paper, a new high - strength worm gearing, named'rolling cone enveloping hourglass worm gearing' is proposed. With such a new type of worm gearing, the motion form between meshing tooth surfaces is changed in nature. A systematic theoretical study. a lot of numerical calculations and parameter analyses have been done. Based on these analyses,the optimum design of worm gearing is obtained. It is shown that this worm gearing possesses the virtues of high efficiency, large load capacity, long life -span and easy meanufacture.  相似文献   

STUDY OF DIGITAL SIMULATION FOR THE CIRCUIT ELEMENTS AND ELECTROMAGNETIC RELAYS COMMONLY USED IN RELAY PROTECTIVE DEVICES     

Wang Xiaoru Mi Linshu 《保鲜与加工》1989,(1):26-35

This paper applies the Gear-4 algorithm to constitute the companion models lor the circuit elements and electromagnetic relays commonly used in relay protective devices. The interface computation, which describes the node equation of companion model and differential equation of mechanical moving part for the electromagnetic Jelay, is also presented. For the reason mentioned above, it makes possible* to solve more accurately the transient process of relay protective devices including electromagnetic relay using the companion model method. The simplicity and effectiveness of interface computation have been proved by the example calcultaion.  相似文献