Pub Date : 2014-08-04DOI: 10.1504/IJCAT.1994.062515
T. Johansson
A review of the development of finite element modelling (pre–processing) and results presentation (post–processing) is given. The relation between design and analysis is discussed. Different approaches to mesh generation are summarised, and some on–going research in this important area is briefly outlined. How material, loads, and other physical or environmental data are added to the model is described. Major progress in model and result visualisation made through development in both algorithms and hardware are accounted for. The importance of the data–structure for good interactive response is stressed. As pre– and post–processors are used in conjunction with finite element programs, data transfer is an essential topic. Also the place of pre–post in a wider CAE environment is discussed.
{"title":"Trends in pre– and post–processing","authors":"T. Johansson","doi":"10.1504/IJCAT.1994.062515","DOIUrl":"https://doi.org/10.1504/IJCAT.1994.062515","url":null,"abstract":"A review of the development of finite element modelling (pre–processing) and results presentation (post–processing) is given. The relation between design and analysis is discussed. Different approaches to mesh generation are summarised, and some on–going research in this important area is briefly outlined. How material, loads, and other physical or environmental data are added to the model is described. Major progress in model and result visualisation made through development in both algorithms and hardware are accounted for. The importance of the data–structure for good interactive response is stressed. As pre– and post–processors are used in conjunction with finite element programs, data transfer is an essential topic. Also the place of pre–post in a wider CAE environment is discussed.","PeriodicalId":46624,"journal":{"name":"INTERNATIONAL JOURNAL OF COMPUTER APPLICATIONS IN TECHNOLOGY","volume":"332 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2014-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76374329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-08-04DOI: 10.1504/IJCAT.1995.062400
B. Bandelie, F. Rioux‐Damidau
Starting from the magnetic field formulation of magnetodynamics, we consider the coupling of a finite element method in the conductors with a boundary integral method for the description of the exterior region. We examine three different discretizations: one variable per edge, two variables per edge and nodal variables. We determine the precision on the magnetic field h and the current j = curl h as a function of the dimension of the mesh and of the CPU time in each case. We deduce the best–suited variable to the computation of each physical quantity.
{"title":"3D modelling of electromagnetic fields: advantages and disadvantages of nodal or edge elements","authors":"B. Bandelie, F. Rioux‐Damidau","doi":"10.1504/IJCAT.1995.062400","DOIUrl":"https://doi.org/10.1504/IJCAT.1995.062400","url":null,"abstract":"Starting from the magnetic field formulation of magnetodynamics, we consider the coupling of a finite element method in the conductors with a boundary integral method for the description of the exterior region. We examine three different discretizations: one variable per edge, two variables per edge and nodal variables. We determine the precision on the magnetic field h and the current j = curl h as a function of the dimension of the mesh and of the CPU time in each case. We deduce the best–suited variable to the computation of each physical quantity.","PeriodicalId":46624,"journal":{"name":"INTERNATIONAL JOURNAL OF COMPUTER APPLICATIONS IN TECHNOLOGY","volume":"31 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2014-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81862319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-08-04DOI: 10.1504/IJCAT.1996.062316
Chih-Hsiung Huang, Ying T. Wang
A single–rod cylinder servo system driving a single–side load is typically a 4th–order non–linear and discontinuous system. However, its asymmetric nature will cause steady state error in position control. At the low frequency of interest, this system can be simplified as a 1st–order ARMA model and the PEDF algorithm is used for parameter adaptation. In addition to tracing the time–varying and discontinuous parameters, the PEDF is to ensure the covariance matrix is bounded so as to guard against peak in the parameter adaptation process. To eliminate steady state error, an integrator is included in the structure of implicit STR and it only estimates two controller parameters by applying the final value theorem of the z–transform. The proposed implicit STR not only avoids unstable pole–zero cancellation, but also prevents the redundant zero of the high order model from being hidden. Finally, various experiments prove its effectiveness and adaptation numerically.
{"title":"The simplified STR applied to an asymmetric hydraulic servo system","authors":"Chih-Hsiung Huang, Ying T. Wang","doi":"10.1504/IJCAT.1996.062316","DOIUrl":"https://doi.org/10.1504/IJCAT.1996.062316","url":null,"abstract":"A single–rod cylinder servo system driving a single–side load is typically a 4th–order non–linear and discontinuous system. However, its asymmetric nature will cause steady state error in position control. At the low frequency of interest, this system can be simplified as a 1st–order ARMA model and the PEDF algorithm is used for parameter adaptation. In addition to tracing the time–varying and discontinuous parameters, the PEDF is to ensure the covariance matrix is bounded so as to guard against peak in the parameter adaptation process. To eliminate steady state error, an integrator is included in the structure of implicit STR and it only estimates two controller parameters by applying the final value theorem of the z–transform. The proposed implicit STR not only avoids unstable pole–zero cancellation, but also prevents the redundant zero of the high order model from being hidden. Finally, various experiments prove its effectiveness and adaptation numerically.","PeriodicalId":46624,"journal":{"name":"INTERNATIONAL JOURNAL OF COMPUTER APPLICATIONS IN TECHNOLOGY","volume":"74 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2014-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85720406","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-08-04DOI: 10.1504/IJCAT.1998.062203
T. Campbell, L. Yu
In this paper an insight into the problem of the 'sliding–valve' effect is discussed for general industrial applications. The 'curved–pipe' effect is also considered for applications in two–stroke engines. The background to the treatment of variable openings for two–stroke engines is reviewed. A novel method for a moving mesh is presented in the simulation of a changing geometry with variable openings using a multi–dimensional CFD code. The results of applying this model to direct–fuel–injection two–stroke engines are presented.
{"title":"Simulation of changing geometry with variable openings using CFD","authors":"T. Campbell, L. Yu","doi":"10.1504/IJCAT.1998.062203","DOIUrl":"https://doi.org/10.1504/IJCAT.1998.062203","url":null,"abstract":"In this paper an insight into the problem of the 'sliding–valve' effect is discussed for general industrial applications. The 'curved–pipe' effect is also considered for applications in two–stroke engines. The background to the treatment of variable openings for two–stroke engines is reviewed. A novel method for a moving mesh is presented in the simulation of a changing geometry with variable openings using a multi–dimensional CFD code. The results of applying this model to direct–fuel–injection two–stroke engines are presented.","PeriodicalId":46624,"journal":{"name":"INTERNATIONAL JOURNAL OF COMPUTER APPLICATIONS IN TECHNOLOGY","volume":"65 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2014-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74975463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-08-04DOI: 10.1504/IJCAT.1990.062690
Y. Nakajima, Y. Hori, M. Fukuda, S. Iguchi
Various simulation programs are used in analysing vehicle performance. In some cases, experimental databased simulation programs are more effective in terms of practicality or calculation accuracy. Models for analysing vehicle performance (driving performance, noise, vibration, etc.) have been developed and systemised by unifying experimental data acquisition systems and simulation systems. Furthermore, a database containing simulation inputs has been constructed. This system embodies the advanced concepts of CAE systems advocated in recent years. Application of this system should enable effective performance analyses to be carried out in every area.
{"title":"The development of an experimental CAE system (a simulation system for analysing vehicle performance)","authors":"Y. Nakajima, Y. Hori, M. Fukuda, S. Iguchi","doi":"10.1504/IJCAT.1990.062690","DOIUrl":"https://doi.org/10.1504/IJCAT.1990.062690","url":null,"abstract":"Various simulation programs are used in analysing vehicle performance. In some cases, experimental databased simulation programs are more effective in terms of practicality or calculation accuracy. Models for analysing vehicle performance (driving performance, noise, vibration, etc.) have been developed and systemised by unifying experimental data acquisition systems and simulation systems. Furthermore, a database containing simulation inputs has been constructed. This system embodies the advanced concepts of CAE systems advocated in recent years. Application of this system should enable effective performance analyses to be carried out in every area.","PeriodicalId":46624,"journal":{"name":"INTERNATIONAL JOURNAL OF COMPUTER APPLICATIONS IN TECHNOLOGY","volume":"9 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2014-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75282727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-08-04DOI: 10.1504/IJCAT.1989.062674
H. Schwärtzel
With a 25% annual growth rate, the world software market is expanding almost four times as fast as the electrical and electronics market. Software is fuelling innovation in everything from ISDN to photocomposition; but development remains an elaborate process.
{"title":"Software: Running on the right numbers","authors":"H. Schwärtzel","doi":"10.1504/IJCAT.1989.062674","DOIUrl":"https://doi.org/10.1504/IJCAT.1989.062674","url":null,"abstract":"With a 25% annual growth rate, the world software market is expanding almost four times as fast as the electrical and electronics market. Software is fuelling innovation in everything from ISDN to photocomposition; but development remains an elaborate process.","PeriodicalId":46624,"journal":{"name":"INTERNATIONAL JOURNAL OF COMPUTER APPLICATIONS IN TECHNOLOGY","volume":"10 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2014-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79266533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-08-04DOI: 10.1504/IJCAT.1990.062714
R. Zmeureanu, P. Fazio
The use of computers in the design of energy–efficient buildings has become a necessity because of the large number of parameters such designs involve and the need to meet standards that call for computer use. This paper shows how an initial design, developed in accordance with the proposed ASHRAE Standard 90.1 P 'Energy efficient design of new buildings except low–rise residential buildings', is modified to reduce the building's energy costs.
{"title":"Computer–aided design of energy–efficient buildings","authors":"R. Zmeureanu, P. Fazio","doi":"10.1504/IJCAT.1990.062714","DOIUrl":"https://doi.org/10.1504/IJCAT.1990.062714","url":null,"abstract":"The use of computers in the design of energy–efficient buildings has become a necessity because of the large number of parameters such designs involve and the need to meet standards that call for computer use. This paper shows how an initial design, developed in accordance with the proposed ASHRAE Standard 90.1 P 'Energy efficient design of new buildings except low–rise residential buildings', is modified to reduce the building's energy costs.","PeriodicalId":46624,"journal":{"name":"INTERNATIONAL JOURNAL OF COMPUTER APPLICATIONS IN TECHNOLOGY","volume":"67 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2014-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90276749","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-08-04DOI: 10.1504/IJCAT.1997.062244
N. Wu, Ka-Ching Chan, S. Leong
Static indeterminacy and frictional constraint nonlinearity are common problems encountered in fixture configuration design. In a fixture–workpiece system, the behaviour of contact is influenced by a combination of geometrical, kinematic and elastic relationships. Our objective is to determine clamping force intensities for a given layout of fixels by investigating contact force distribution. In this paper, we present a numerical procedure to accurately determine clamping forces required to satisfy fixturing requirements with good computational efficiency. A system of virtual springs is used to illustrate the states of contact restraints at locating and clamping points. The differences between manual clamping and power clamping are investigated and analysed theoretically. A cone set of virtual springs is introduced to model a frictional contact. We then develop a linear programming model to find a set of minimum clamping force intensities, and to identify their feasible directions for increments. Examples are also given to demonstrate the procedure.
{"title":"Static interactions of surface contacts in a fixture–workpiece system","authors":"N. Wu, Ka-Ching Chan, S. Leong","doi":"10.1504/IJCAT.1997.062244","DOIUrl":"https://doi.org/10.1504/IJCAT.1997.062244","url":null,"abstract":"Static indeterminacy and frictional constraint nonlinearity are common problems encountered in fixture configuration design. In a fixture–workpiece system, the behaviour of contact is influenced by a combination of geometrical, kinematic and elastic relationships. Our objective is to determine clamping force intensities for a given layout of fixels by investigating contact force distribution. In this paper, we present a numerical procedure to accurately determine clamping forces required to satisfy fixturing requirements with good computational efficiency. A system of virtual springs is used to illustrate the states of contact restraints at locating and clamping points. The differences between manual clamping and power clamping are investigated and analysed theoretically. A cone set of virtual springs is introduced to model a frictional contact. We then develop a linear programming model to find a set of minimum clamping force intensities, and to identify their feasible directions for increments. Examples are also given to demonstrate the procedure.","PeriodicalId":46624,"journal":{"name":"INTERNATIONAL JOURNAL OF COMPUTER APPLICATIONS IN TECHNOLOGY","volume":"70 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2014-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90745920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-08-04DOI: 10.1504/IJCAT.1991.062583
S. Bennani, V. Badeva
This paper presents a method, and some utilities, for establishing a planning and control system for the management of a computer centre. This planning system provides the conditions for optimal use and availability of the centre's resources. The system's structure is modular and extendible. It defines modules for establishing plans. It also creates automatic modules for monitoring and routine task execution according to the plan's imperatives. It has the ability to balance the redistribution of resources. Both the originality of its conception and the ease with which it can be set up make this system applicable to a large number of engineering domains, and especially to those with complex operations that need planning and real time monitoring.
{"title":"A system for planning and optimal control in computer–centre management","authors":"S. Bennani, V. Badeva","doi":"10.1504/IJCAT.1991.062583","DOIUrl":"https://doi.org/10.1504/IJCAT.1991.062583","url":null,"abstract":"This paper presents a method, and some utilities, for establishing a planning and control system for the management of a computer centre. This planning system provides the conditions for optimal use and availability of the centre's resources. The system's structure is modular and extendible. It defines modules for establishing plans. It also creates automatic modules for monitoring and routine task execution according to the plan's imperatives. It has the ability to balance the redistribution of resources. Both the originality of its conception and the ease with which it can be set up make this system applicable to a large number of engineering domains, and especially to those with complex operations that need planning and real time monitoring.","PeriodicalId":46624,"journal":{"name":"INTERNATIONAL JOURNAL OF COMPUTER APPLICATIONS IN TECHNOLOGY","volume":"51 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2014-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89946475","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-08-04DOI: 10.1504/IJCAT.1995.062416
Ranjan B. Kini
Lately, managers have been waving the flag about electronic data interchange (EDI) as a 'strategic weapon' in global competition. It is an innovative tool useful for accurate and timely interchange of business information. The major focus of EDI is 'business' related, not technology related. In this paper, these 'business' related issues, their complexity and challenges for harmonisation in the global business context are discussed.
{"title":"Challenges for electronic data interchange in becoming a global competitive tool","authors":"Ranjan B. Kini","doi":"10.1504/IJCAT.1995.062416","DOIUrl":"https://doi.org/10.1504/IJCAT.1995.062416","url":null,"abstract":"Lately, managers have been waving the flag about electronic data interchange (EDI) as a 'strategic weapon' in global competition. It is an innovative tool useful for accurate and timely interchange of business information. The major focus of EDI is 'business' related, not technology related. In this paper, these 'business' related issues, their complexity and challenges for harmonisation in the global business context are discussed.","PeriodicalId":46624,"journal":{"name":"INTERNATIONAL JOURNAL OF COMPUTER APPLICATIONS IN TECHNOLOGY","volume":"65 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2014-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72838364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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