摘要:

Abstract:This paper presents the development of an automatic two‐dimensional finite element mesh generator where its core algorithm for selecting the optimum splitting line is based on fuzzy logic. With a series of fuzzy IF‐THEN rules, the mesh generator tends to form well‐shaped elements. Most of the elements are quadrilaterals, and for some cases, meshes of all quadrilateral elements are obtained when the fuzzy control is tuned to the basic criteria for creating quadrilaterals. It is observed that furzy control mimics human thinking and performs what one would do. The methodology is simple by its nature, and proved to be elective. In addition, a technique (non‐fuzzy approach) for finding visible nodes in a concave loop as an extension of Talhert and Parkinson's algorithm is also introduced in thi

ISSN:1093-9687    

DOI:10.1111/j.1467-8667.1993.tb00188.x

出版商:Blackwell Publishing Ltd    

年代:1993

数据来源: WILEY

摘要:

Abstract:This paper describes the development of an integrated Information Management expert system (IMXpert) which enables structural engineers or architects to produce results of high quality within a short time in works related to the structural engineering of buildings. IMXpert gives various data or functions according to the user's request.The study can be divided into problem analysis and system design. For the systematic representation of building structure and the structural design process, an object‐oriented design method has been used for the problem analysis. Various types of structural components and operations closely related to them have been extracted and defined as independent objects. The complete building structure and structural design process can be represented by combining these objects and operations. A centralized database has been designed for the consistent and integrated management of object instance

ISSN:1093-9687    

DOI:10.1111/j.1467-8667.1993.tb00189.x

出版商:Blackwell Publishing Ltd    

年代:1993

数据来源: WILEY

摘要:

Abstract:This paper describes the general architecture of a prototypical micro CAD‐based integrated model being developed at Southborough University to aid the planning of in‐situ concrete structures. The model is based on the coupling of two low cost and powerful project management (Artemis 2000) and computer aided design systems (AutoCAD 10) through an intermediary package (dBase IV). The main aim of this model is automate the planning process of in‐situ concrete structures, particularly the generation of network plans, using data generated by CAD systems. The model functional specifications (i.e., modeling, drafting, quantities and materials scheduling, time analysis, cost analysis, and reporting) were established after a thorough review of current planning models, a detailed questionnaire survey conducted amongst the main UK and USA contractors on the current status of planning techniques and information technology applications, and a detailed study of the various problems facing CAD‐based models.This model consists of three individual sub‐systems: modelling, data transfer and planning. The integration of these individual sub‐systems has been achieved on an IBM PS/2 MODEL 70. This enables the generation of network plans in the AutoCAD package (modelling subsystem) which are then automatically transferred (data transfer sub‐system) to the Artemis system for time and cost analyses (planning sub‐system). This paper outlines the work done so far and illustrates the proposed concept with a simpli

ISSN:1093-9687    

DOI:10.1111/j.1467-8667.1993.tb00190.x

出版商:Blackwell Publishing Ltd    

年代:1993

数据来源: WILEY

摘要:

Abstract:This paper presents implementations of new methods solving LU factorization used in engineering applications. The implementations are done on the Alliant FX/80 mini supercomputer and use Level 3 Basic Linear Algebra Subprograms. Three ways of expressing the LU factorization in terms of blocked algorithms are considered. The performance of the blocked algorithms, using the parallel vector facilities, are compared with a no block algorithm using only subprograms of level I and 2 BLAS.

ISSN:1093-9687    

DOI:10.1111/j.1467-8667.1993.tb00191.x

出版商:Blackwell Publishing Ltd    

年代:1993

数据来源: WILEY

摘要:

Abstract:One is still bound to known structural forms and implementing mostly known materials and known technology. It is possible to implement in contemporary design new information technology and advances from other technical fields, to save energy and material resources and implement new forms more suitable to some of the material used. It is shown that new advances in material use and technology implementation should be reflected in new forms. Notably, the implementation of robotics and neural network technology could change the established structural forms. Implementing the computers to maintain the structural safety and integrity in ICIS may be sought, where computers are integral parts of the whole structure as are other more common structural parts.

ISSN:1093-9687    

DOI:10.1111/j.1467-8667.1993.tb00192.x

出版商:Blackwell Publishing Ltd    

年代:1993

数据来源: WILEY

摘要:

Abstract:The crane is the single most important equipment cost item required for erecting structural steel. Each time the crane moves to a new location, equipment time and labor time is lost. This research presents a computerized analysis method to minimize the number of moves required by a mobile crane to erect single story steel structures. The production rule system finds the optimum path for the crane and determines the steel erection sequence.Artificial intelligence techniques are employed to develop the production rule system. They system finds the optimum path for the crane and determines the steel erection sequence. The production rule system consists of three basic components. The first is a knowledge representation which describes the building and crane geometry. Second is the production rules for positioning the crane and sequencing the steel erection. These rules were structured from interviews with steel erectors and converted to logic based rules used in the program. Third is the control strategy which analyzes the various combinations of crane positions. The result is a microcomputer based Prolog program called PRECISE. This program finds the optimal crane positions and the structural members erected from each crane position.

ISSN:1093-9687    

DOI:10.1111/j.1467-8667.1993.tb00193.x

出版商:Blackwell Publishing Ltd    

年代:1993

数据来源: WILEY

摘要:

Abstract:A methodology to derive the membership function of a fuzzy set with objective and subjective information about a fuzzy event is introduced in this paper, This systematic framework makes use of the fuzzy calculus, the program‐evaluation and review technique (PERQ, in operations research, and the outstanding concept of special relativity theory to transform these types of information into a fuzzy set with a resultant membership function. The subjective information can be the multi‐inputs of expert knowledge. The objective part is the statistical data with their known probability‐density function (pdf); however, this probability measure partly reflects the uncertainty assessment and is considered insufficient to describe an actual fuzzy event. If objective information is absent, this transforming or fuzzifving process can also be used to combine the different viewpoints of expe

ISSN:1093-9687    

DOI:10.1111/j.1467-8667.1993.tb00194.x

出版商:Blackwell Publishing Ltd    

年代:1993

数据来源: WILEY

ISSN:1093-9687    

DOI:10.1111/j.1467-8667.1993.tb00195.x

出版商:Blackwell Publishing Ltd    

年代:1993

数据来源: WILEY