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Article
Publication date: 1 January 1992

C. LOMBARD and E.H. MATHEWS

A general numerical method for finding the steady state solution of a cyclic system is presented. The method determines the initial values by enforcing the conditions of…

Abstract

A general numerical method for finding the steady state solution of a cyclic system is presented. The method determines the initial values by enforcing the conditions of periodicity. In this way the initial value is found by integrating through only one cycle, often resulting in a considerable saving of computing effort. The method is applicable to any linear discrete set of difference equations with periodic parameters and forcing functions. The application of the method to a single pole representation of heat flow in buildings is demonstrated.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 2 no. 1
Type: Research Article
ISSN: 0961-5539

Keywords

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Article
Publication date: 22 May 2020

Wei Sun, Shuai Yang, Junnan Gao and Xianfei Yan

It is very important to create a useful cyclic symmetric model for the investigation of the vibration reduction effect of hard-coating blisk. This study aims to develop a…

Abstract

Purpose

It is very important to create a useful cyclic symmetric model for the investigation of the vibration reduction effect of hard-coating blisk. This study aims to develop a cyclic symmetry algorithm which can determine the mode of blisk in the sector coordinate system directly.

Design/methodology/approach

Using the exponential and real quasi-equivalent Fourier matrices, the formulas for solving the sector mode were derived, and the relationship between the two kinds of sector modes was also discussed. Based on the proposed cyclic symmetry algorithm, the vibration characteristics of an academic blisk were solved, and the formulas for solving the natural characteristics and vibration responses of the coated blisk were given.

Findings

A blisk with NiCrAlCoY+YSZ hard coating on both sides of each blade was chosen as a case to demonstrate the presented method. Based on the verification analysis model, the influences of coating thickness on the vibration reduction effect of the blisk were discussed. The results show that the hard coating has good vibration reduction effect on the blisk even the coating thickness is very thin and the vibration reduction effect of hard coating in the high frequency range is obviously better than that in the low frequency range.

Originality/value

As a large number of reduced order modeling methods of blisk are implemented based on the sector modes, the proposed method which can obtain the sector modes directly will significantly improve the efficiency of dynamic modeling and analysis of the coated blisk structure.

Details

Engineering Computations, vol. 37 no. 9
Type: Research Article
ISSN: 0264-4401

Keywords

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Article
Publication date: 16 October 2017

Grzegorz Bocewicz, Mukund Nilakantan Janardhanan, Damian Krenczyk and Zbigniew Banaszak

The purpose of this paper is to focus on the reference model of a grid-like supply network that enables formulation of delivery routing and scheduling problems in the…

Abstract

Purpose

The purpose of this paper is to focus on the reference model of a grid-like supply network that enables formulation of delivery routing and scheduling problems in the context of the periodic vehicle routing problem.

Design/methodology/approach

The conditions for seamless (collision-free) synchronization of periodically executed local transport processes presented in this paper guarantee cyclic execution of supply processes, thereby preventing traffic flow congestion.

Findings

Systems that satisfy this characteristic, cyclic deliveries executed along supply chains are given and what is sought is the number of vehicles needed to operate the local transport processes in order to ensure delivery from and to specific loading/unloading points on given dates. Determination of sufficient conditions guaranteeing the existence of feasible solutions that satisfy these constraints makes it possible to solve the considered class of problems online.

Practical implications

The computer experiments reported in this paper show the possibilities of practical application of the proposed approach in the construction of decision support systems for food supply chain management.

Originality/value

The aim of the present work is to develop a methodology for the synthesis of regularly structured supply networks that would ensure fixed cyclic execution of local transport processes. The proposed methodology, which implements sufficient conditions for the synchronization of local cyclic processes, allows one to develop a method for rapid prototyping of supply processes that satisfies the time windows constraints given.

Details

Industrial Management & Data Systems, vol. 117 no. 9
Type: Research Article
ISSN: 0263-5577

Keywords

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Article
Publication date: 1 July 1968

J.E.A. Gauld

THE main purpose of this article is to deal with control system problems encountered with aircraft de‐icing applications.

Abstract

THE main purpose of this article is to deal with control system problems encountered with aircraft de‐icing applications.

Details

Aircraft Engineering and Aerospace Technology, vol. 40 no. 7
Type: Research Article
ISSN: 0002-2667

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Article
Publication date: 5 June 2007

Thomas W. Jackson

Autopoiesis has been applied to many different fields. One area, however, where little work has been done is the application of autopoietic theory to knowledge management

Abstract

Purpose

Autopoiesis has been applied to many different fields. One area, however, where little work has been done is the application of autopoietic theory to knowledge management. The paper aims to provide a direct comparison between the theory of autopoiesis with aspects of knowledge management, specifically social constructivism.

Design/methodology/approach

The theory of autopoiesis was broken down into easily comparable sections. The theory of social constructivism in relation to knowledge management was then described, followed by a comparison of the two.

Findings

Strong correlations were discovered between autopoiesis and knowledge management, specifically that the cyclical nature of organisational learning and its ability to self‐reproduce the components of its system suggest that it is in some respect an autopoietic entity. However, serious flaws between the two approaches were discovered also.

Originality/value

This paper is the first in‐depth application of autopoiesis to knowledge management and the study of organisations.

Details

Journal of Knowledge Management, vol. 11 no. 3
Type: Research Article
ISSN: 1367-3270

Keywords

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Article
Publication date: 1 July 1980

Tabor R. Novak

Introduction The concept of inventory management consists of establishing and maintaining the proper balance of two complementary, yet conflicting goals: maximum level of…

Abstract

Introduction The concept of inventory management consists of establishing and maintaining the proper balance of two complementary, yet conflicting goals: maximum level of service and minimum inventory investment.

Details

Management Decision, vol. 18 no. 7
Type: Research Article
ISSN: 0025-1747

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Article
Publication date: 1 November 2001

Sun Sheng Han and Shi Ming Yu

Discusses a geographic information system (GIS) application, known as EMAPS, in public housing management in Singapore’s town councils. EMAPS is a recent addition to town…

Abstract

Discusses a geographic information system (GIS) application, known as EMAPS, in public housing management in Singapore’s town councils. EMAPS is a recent addition to town council information systems, contributing to the management and analysis of spatial information. The development and implementation of EMAPS highlight a number of challenges that are faced by facility management professionals in their efforts to build up a competitive edge for their businesses in this dynamic high‐tech age.

Details

Facilities, vol. 19 no. 11/12
Type: Research Article
ISSN: 0263-2772

Keywords

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Article
Publication date: 22 March 2011

K. Nilakantan, Jayaram K. Sankaran and B.G. Raghavendra

The purpose of this paper is to construct a model of hierarchical manpower systems which follow proportionality policies in recruitment and promotion of their staff…

Abstract

Purpose

The purpose of this paper is to construct a model of hierarchical manpower systems which follow proportionality policies in recruitment and promotion of their staff, ostensibly with a view to safeguard the career interests of their existing employees.

Design/methodology/approach

The manpower systems are modeled as Markov systems, and their inherent characteristics and long‐term behavior are studied.

Findings

Significantly it is shown that such proportionality systems do not compromise on flexibility in the long term, and can also provide an additional means of controlling the blend of manpower in the system. The theoretical results were tested with real‐world data, and a good degree of conformity was observed between the theoretical predictions and the actually observed behaviour.

Practical implications

The model can also be applied to organizations which outsource a part of their work, the outsource workforce being notionally being considered as recruits to the system.

Originality/value

Outsourcing of work is being practiced on an ever‐increasing scale nowadays, and becoming, at times, even controversial, and as a consequence, an increasing number of organizations are resorting to protectionist policies; the model in this paper provides a theoretical framework in which to view and analyze this phenomenon.

Details

Journal of Modelling in Management, vol. 6 no. 1
Type: Research Article
ISSN: 1746-5664

Keywords

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Article
Publication date: 26 July 2011

Rashid Mehmood and Jie A. Lu

Markov chains and queuing theory are widely used analysis, optimization and decision‐making tools in many areas of science and engineering. Real life systems could be…

Abstract

Purpose

Markov chains and queuing theory are widely used analysis, optimization and decision‐making tools in many areas of science and engineering. Real life systems could be modelled and analysed for their steady‐state and time‐dependent behaviour. Performance measures such as blocking probability of a system can be calculated by computing the probability distributions. A major hurdle in the applicability of these tools to complex large problems is the curse of dimensionality problem because models for even trivial real life systems comprise millions of states and hence require large computational resources. This paper describes the various computational dimensions in Markov chains modelling and briefly reports on the author's experiences and developed techniques to combat the curse of dimensionality problem.

Design/methodology/approach

The paper formulates the Markovian modelling problem mathematically and shows, using case studies, that it poses both storage and computational time challenges when applied to the analysis of large complex systems.

Findings

The paper demonstrates using intelligent storage techniques, and concurrent and parallel computing methods that it is possible to solve very large systems on a single or multiple computers.

Originality/value

The paper has developed an interesting case study to motivate the reader and have computed and visualised data for steady‐state analysis of the system performance for a set of seven scenarios. The developed methods reviewed in this paper allow efficient solution of very large Markov chains. Contemporary methods for the solution of Markov chains cannot solve Markov models of the sizes considered in this paper using similar computing machines.

Details

Journal of Manufacturing Technology Management, vol. 22 no. 6
Type: Research Article
ISSN: 1741-038X

Keywords

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Abstract

Details

Visionary Leadership in a Turbulent World
Type: Book
ISBN: 978-1-78714-242-8

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