An investigation into project failures
- Authors: Kirunda, Ezra
- Date: 2012-02-06
- Subjects: System failures (Engineering) , Project management
- Type: Thesis
- Identifier: http://ujcontent.uj.ac.za8080/10210/365405 , uj:2021 , http://hdl.handle.net/10210/4373
- Description: M.Phil.
- Full Text:
- Authors: Kirunda, Ezra
- Date: 2012-02-06
- Subjects: System failures (Engineering) , Project management
- Type: Thesis
- Identifier: http://ujcontent.uj.ac.za8080/10210/365405 , uj:2021 , http://hdl.handle.net/10210/4373
- Description: M.Phil.
- Full Text:
Fuzzy logic and condition-based maintenance approaches to machine failure analysis
- Authors: Mushiri, Tawanda
- Date: 2017
- Subjects: Fuzzy logic , Fuzzy systems - Industrial applications , System failures (Engineering) , Reliability (Engineering)
- Language: English
- Type: Doctoral (Thesis)
- Identifier: http://hdl.handle.net/10210/243068 , uj:25088
- Description: D.Ing. (Engineering Management) , Abstract: When the complexity of the controller plant is a non-linear system, the production process cannot be fulfilled by the control effect and it is not easy to manipulate the parameters on Proportional-Integral-Derivative Controller. The major objective under study is simulating and modelling machinery then come up with a suitable intelligent Condition Based Maintenance system (i.e to develop a suitable intelligent system using fuzzy logic and artificial intelligence). The area under study of Fuzzy Logic came as a concern of nonlinear systems which fail to give correct information since machines use conventional Proportional-Integral-Derivative and hence this is for linear systems. Considering vibrations and continuous failure of machines, this will cause incorrect data portraying. Three companies were done in this thesis and all were analysed using fuzzy logic and some finite element analysis of components to monitor the parameters. Root cause analysis was also done to determine what was failing on different equipments. Three companies in a developing country were used as case studies for testing fuzzy logic approaches and models to machinery failure analysis. The three companies are designated as follows: Beverages Production Company, Hydro Power Generating Company and Water Distributing Company. The overall effectiveness of the companies were heavily affected due to many breakdowns. The main problem was found to be resulting from failure to monitor nonlinear systems that naturally exist in such environments. On the bottle washer at Beverages Production Company, fuzzy logic with Model Reference Adaptive Control to prevent failure on the bottle washer and introduce an intelligent Condition Based Maintenance program was done, a solution to come up with a control system that monitors water in the dam as well as protecting the equipment from failure and do stability control of machinery for Water Distributing Company as well as apply the concept of Maintenance Free Operating Period reliability metric to determine maintenance intervals as opposed to Mean Time Between Failure to the Hydro-Power Generation Company and also do a Simulink control on the governor. The results of the simulation of the control strategy of Fuzzy Logic Proportional-Integral-Derivative Controller have much preferred performance as compared to the general Proportional-Integral-Derivative Controller. This was done in the Simulink/Matlab simulation environment. The innovations behind this thesis at Beverages Production Company, the pneumatic valve of the bottle washer which controls the discharge of clean bottles was occasionally sticking or failing resulting in significant loss of production in the plant since all the other processes which follow depend on the bottle washer. The main causes of failure were caused by poor control of temperature and pressure. Excessive moisture and abrasive particles also caused failures. In order to solve this problem a Model Reference Adaptive Fuzzy Controller was designed for the pneumatic valve using the Matlab software. The error resulting from the difference between the actual system output and that of the reference model was executed by the Fuzzy Logic Controller. At company Hydro-Power Generation Company, the administering system of a 150 Megawatts Francis Turbine was developed using fuzzy logic. The representative framework parameters were mirrored with the real information accessible in the power plant. At Water Distributing Company the problem of corroding gates and failure was solved using solid works, Matlab, Programmable Logic Controller and Simulink. The sluice gate valve was controlled and done stability by Matlab to avoid failure. After fuzzy logic is applied in each and every company under study, the breakdowns will be less and machinery can be diagnosed and prognosis is easy to foresee the failures. A new gate was designed by the researcher. The research has shown that fuzzy logic being intelligent, machinery can last longer and production is high. The limitations are that although it is good in monitoring but in some machinery and companies may not work well because of environment like in the water gates. It is also expensive to implement and difficult to convince management to do the research for a start.
- Full Text:
- Authors: Mushiri, Tawanda
- Date: 2017
- Subjects: Fuzzy logic , Fuzzy systems - Industrial applications , System failures (Engineering) , Reliability (Engineering)
- Language: English
- Type: Doctoral (Thesis)
- Identifier: http://hdl.handle.net/10210/243068 , uj:25088
- Description: D.Ing. (Engineering Management) , Abstract: When the complexity of the controller plant is a non-linear system, the production process cannot be fulfilled by the control effect and it is not easy to manipulate the parameters on Proportional-Integral-Derivative Controller. The major objective under study is simulating and modelling machinery then come up with a suitable intelligent Condition Based Maintenance system (i.e to develop a suitable intelligent system using fuzzy logic and artificial intelligence). The area under study of Fuzzy Logic came as a concern of nonlinear systems which fail to give correct information since machines use conventional Proportional-Integral-Derivative and hence this is for linear systems. Considering vibrations and continuous failure of machines, this will cause incorrect data portraying. Three companies were done in this thesis and all were analysed using fuzzy logic and some finite element analysis of components to monitor the parameters. Root cause analysis was also done to determine what was failing on different equipments. Three companies in a developing country were used as case studies for testing fuzzy logic approaches and models to machinery failure analysis. The three companies are designated as follows: Beverages Production Company, Hydro Power Generating Company and Water Distributing Company. The overall effectiveness of the companies were heavily affected due to many breakdowns. The main problem was found to be resulting from failure to monitor nonlinear systems that naturally exist in such environments. On the bottle washer at Beverages Production Company, fuzzy logic with Model Reference Adaptive Control to prevent failure on the bottle washer and introduce an intelligent Condition Based Maintenance program was done, a solution to come up with a control system that monitors water in the dam as well as protecting the equipment from failure and do stability control of machinery for Water Distributing Company as well as apply the concept of Maintenance Free Operating Period reliability metric to determine maintenance intervals as opposed to Mean Time Between Failure to the Hydro-Power Generation Company and also do a Simulink control on the governor. The results of the simulation of the control strategy of Fuzzy Logic Proportional-Integral-Derivative Controller have much preferred performance as compared to the general Proportional-Integral-Derivative Controller. This was done in the Simulink/Matlab simulation environment. The innovations behind this thesis at Beverages Production Company, the pneumatic valve of the bottle washer which controls the discharge of clean bottles was occasionally sticking or failing resulting in significant loss of production in the plant since all the other processes which follow depend on the bottle washer. The main causes of failure were caused by poor control of temperature and pressure. Excessive moisture and abrasive particles also caused failures. In order to solve this problem a Model Reference Adaptive Fuzzy Controller was designed for the pneumatic valve using the Matlab software. The error resulting from the difference between the actual system output and that of the reference model was executed by the Fuzzy Logic Controller. At company Hydro-Power Generation Company, the administering system of a 150 Megawatts Francis Turbine was developed using fuzzy logic. The representative framework parameters were mirrored with the real information accessible in the power plant. At Water Distributing Company the problem of corroding gates and failure was solved using solid works, Matlab, Programmable Logic Controller and Simulink. The sluice gate valve was controlled and done stability by Matlab to avoid failure. After fuzzy logic is applied in each and every company under study, the breakdowns will be less and machinery can be diagnosed and prognosis is easy to foresee the failures. A new gate was designed by the researcher. The research has shown that fuzzy logic being intelligent, machinery can last longer and production is high. The limitations are that although it is good in monitoring but in some machinery and companies may not work well because of environment like in the water gates. It is also expensive to implement and difficult to convince management to do the research for a start.
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Information systems project failure : a managerial approach
- Authors: De Beer, André
- Date: 2011-11-24
- Subjects: Management information systems , Information resources management , Computer system failures , System failures (Engineering) , Project management
- Type: Thesis
- Identifier: uj:1734 , http://hdl.handle.net/10210/4083
- Description: M.Ing. , Failure is a part of every day life. Information systems project failures are reported regularly in the media. The growth of the information technology industry in its entirety has been very dramatic over the last decade. Large information systems projects have always posed as a challenge for development teams and organizations. The nature of these challenges have increased with the growth of information systems projects over the last decade. With the critical role that information systems have in organizations, it is critical that information systems are delivered on time within budget and according to the requirements. Unfortunately many of the information systems projects that have been started, are cancelled, not on time or over budget. It is the purpose of this dissertation to discuss some of the managerial causes of why information systems projects fail, and also to address issues that could prevent the failure of information systems projects.
- Full Text:
- Authors: De Beer, André
- Date: 2011-11-24
- Subjects: Management information systems , Information resources management , Computer system failures , System failures (Engineering) , Project management
- Type: Thesis
- Identifier: uj:1734 , http://hdl.handle.net/10210/4083
- Description: M.Ing. , Failure is a part of every day life. Information systems project failures are reported regularly in the media. The growth of the information technology industry in its entirety has been very dramatic over the last decade. Large information systems projects have always posed as a challenge for development teams and organizations. The nature of these challenges have increased with the growth of information systems projects over the last decade. With the critical role that information systems have in organizations, it is critical that information systems are delivered on time within budget and according to the requirements. Unfortunately many of the information systems projects that have been started, are cancelled, not on time or over budget. It is the purpose of this dissertation to discuss some of the managerial causes of why information systems projects fail, and also to address issues that could prevent the failure of information systems projects.
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Management of the diagnosis, specification and execution of concrete repairs for reliability
- Authors: Bester, Johannes Jacob
- Date: 2011-02-28T06:08:29Z
- Subjects: Concrete maintenance and repair , Reliability (Engineering) , Maintainability (Engineering) , System failures (Engineering)
- Type: Thesis
- Identifier: uj:7034 , http://hdl.handle.net/10210/3556
- Description: M. Phil. , Concrete is worldwide the most commonly used construction material and, although concrete is durable when exposed to aggressive conditions, it requires some maintenance. If this maintenance is neglected for a prolonged period of time, intrinsic and extrinsic factors will cause the concrete to degrade necessitating repair and rehabilitation. The correct diagnosis of the root cause of degradation, proper specification of repair materials and quality execution of the concrete repairs all contribute to the reliability of the repairs. The correct management of the repair process is necessary to ensure reliability in order for the structure to be returned to an acceptable state.
- Full Text:
- Authors: Bester, Johannes Jacob
- Date: 2011-02-28T06:08:29Z
- Subjects: Concrete maintenance and repair , Reliability (Engineering) , Maintainability (Engineering) , System failures (Engineering)
- Type: Thesis
- Identifier: uj:7034 , http://hdl.handle.net/10210/3556
- Description: M. Phil. , Concrete is worldwide the most commonly used construction material and, although concrete is durable when exposed to aggressive conditions, it requires some maintenance. If this maintenance is neglected for a prolonged period of time, intrinsic and extrinsic factors will cause the concrete to degrade necessitating repair and rehabilitation. The correct diagnosis of the root cause of degradation, proper specification of repair materials and quality execution of the concrete repairs all contribute to the reliability of the repairs. The correct management of the repair process is necessary to ensure reliability in order for the structure to be returned to an acceptable state.
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Prevention of project failures using early warning signs in the South African mining communities
- Authors: Ramoshebi, Tshepiso
- Date: 2020
- Subjects: Mineral industries - South Africa - Rustenburg - Management , Project management , System failures (Engineering) , Sustainable development
- Language: English
- Type: Masters (Thesis)
- Identifier: http://hdl.handle.net/10210/479644 , uj:43392
- Description: Abstract: It is no new fact that the mining industry plays a pivotal role in the circulation of wealth and raw material to the global economies and other industries. More so in South Africa, mining appears as a magnet for attracting foreign investments and establishing leading international ventures. However, the effect of environmental dilapidation, as well as socio-economic complications in beneficiary communities has been an attribute of the mining industry despite several measures aimed at eradicating negative impacts caused by mining activities. These sustainable development projects established in the mining communities were found to be unsustainable and most of them failed despite huge injections of funding and human resources... , M.Phil. (Engineering Management)
- Full Text:
- Authors: Ramoshebi, Tshepiso
- Date: 2020
- Subjects: Mineral industries - South Africa - Rustenburg - Management , Project management , System failures (Engineering) , Sustainable development
- Language: English
- Type: Masters (Thesis)
- Identifier: http://hdl.handle.net/10210/479644 , uj:43392
- Description: Abstract: It is no new fact that the mining industry plays a pivotal role in the circulation of wealth and raw material to the global economies and other industries. More so in South Africa, mining appears as a magnet for attracting foreign investments and establishing leading international ventures. However, the effect of environmental dilapidation, as well as socio-economic complications in beneficiary communities has been an attribute of the mining industry despite several measures aimed at eradicating negative impacts caused by mining activities. These sustainable development projects established in the mining communities were found to be unsustainable and most of them failed despite huge injections of funding and human resources... , M.Phil. (Engineering Management)
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The feasibility of vibration analysis as a mechanism of failure analysis in failure investigations and root cause analysis
- Authors: Human, Etienne
- Date: 2012-07-31
- Subjects: Vibration , Structural dynamics , Structural analysis (Engineering) , Mechanics, Applied , System failures (Engineering)
- Type: Thesis
- Identifier: uj:8872 , http://hdl.handle.net/10210/5339
- Description: M.Phil. , “Failure is one of the unfortunate facts of life”. This is the very first statement in the book by Coetzee (1998). This statement is unfortunately true, leading to the fact that failure is a reality, to be dealt with. Dealing with it in a proactive way will provide warnings of an approaching failure. Dealing with it in a reactive way will go through the “surprising pain” of an unexpected breakdown or downtime. In both cases the source of failure must be known to prevent it from happening again. Root Cause Analysis (RCA) is a structured method of determining the reason (root cause) of a failure. On the other hand, Vibration Analysis is one of the best known methods of condition monitoring and has the capability to indicate a reason for failure, although not necessarily the root cause or causes. The objective of this dissertation is to investigate the possibility to combine the RCA method with Vibration Analysis as forensic science to improve the success of finding root causes and their solutions.
- Full Text:
- Authors: Human, Etienne
- Date: 2012-07-31
- Subjects: Vibration , Structural dynamics , Structural analysis (Engineering) , Mechanics, Applied , System failures (Engineering)
- Type: Thesis
- Identifier: uj:8872 , http://hdl.handle.net/10210/5339
- Description: M.Phil. , “Failure is one of the unfortunate facts of life”. This is the very first statement in the book by Coetzee (1998). This statement is unfortunately true, leading to the fact that failure is a reality, to be dealt with. Dealing with it in a proactive way will provide warnings of an approaching failure. Dealing with it in a reactive way will go through the “surprising pain” of an unexpected breakdown or downtime. In both cases the source of failure must be known to prevent it from happening again. Root Cause Analysis (RCA) is a structured method of determining the reason (root cause) of a failure. On the other hand, Vibration Analysis is one of the best known methods of condition monitoring and has the capability to indicate a reason for failure, although not necessarily the root cause or causes. The objective of this dissertation is to investigate the possibility to combine the RCA method with Vibration Analysis as forensic science to improve the success of finding root causes and their solutions.
- Full Text:
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