Pub Date : 2021-02-22DOI: 10.9734/bpi/nicst/v7/7074d
J. Kiciński
In this paper we will discuss the problem of mathematical description of two basic sub-systems composing a rotating machine, which are the line of rotors with bearings and the supporting structure. If we want to obtain non-elliptic trajectories, with various types of defects in systems operation and complicated vibration spectra coded in their shapes - which makes the basis for technical diagnostics - we must turn to the non-linear analysis and solve the equations of motion in another reference system. The subsystems that frequently reveal non-linear characteristics include the line of rotors with constructional and operational imperfections (misalignment, shaft cracks), and, undoubtedly, the slide bearings and labyrinth seals. At the same time the supporting structure can be treated with satisfactory accuracy as a subsystem having the linear characteristics. In this situation a key question is how to unite in one system the supporting structure, with its linear characteristics, and the line of rotors and bearings, resting on the supporting structure and definitely representing the non-linear characteristics. Here, such an elegant notation in the form of a complex matrix for the entire machine is not possible any longer. From the mathematical point of view the situation is becoming dramatically more complicated. This assessment mainly depends on theproperties of the construction itself, more precisely on the degree of complexity of its modal model, as well on available measurement or simulation data, and possible interaction of those supporting structure elements which can reveal non-linear characteristics. In this paper we will propose solutions to this problem in the form of so-called adequacy intervals of the supporting structure dynamic characteristics, with relevant transformation of those characteristics, and will present a novel concept how to incorporate those characteristics to the rotor line dynamics, based on a so-called weight functions proportional to the vibration spectrum of the supports. The proposed concept can be of extreme value for defining defect-symptom relations, to be used in a new and rapidly developing discipline of science bearing the name of the model based diagnostics.
{"title":"Study on the New Concept of the Rotors and Supporting Structure Transformation for Non-linear Vibrations Analysis","authors":"J. Kiciński","doi":"10.9734/bpi/nicst/v7/7074d","DOIUrl":"https://doi.org/10.9734/bpi/nicst/v7/7074d","url":null,"abstract":"In this paper we will discuss the problem of mathematical description of two basic sub-systems composing a rotating machine, which are the line of rotors with bearings and the supporting structure. If we want to obtain non-elliptic trajectories, with various types of defects in systems operation and complicated vibration spectra coded in their shapes - which makes the basis for technical diagnostics - we must turn to the non-linear analysis and solve the equations of motion in another reference system. The subsystems that frequently reveal non-linear characteristics include the line of rotors with constructional and operational imperfections (misalignment, shaft cracks), and, undoubtedly, the slide bearings and labyrinth seals. At the same time the supporting structure can be treated with satisfactory accuracy as a subsystem having the linear characteristics. \u0000In this situation a key question is how to unite in one system the supporting structure, with its linear characteristics, and the line of rotors and bearings, resting on the supporting structure and definitely representing the non-linear characteristics. Here, such an elegant notation in the form of a complex matrix for the entire machine is not possible any longer. From the mathematical point of view the situation is becoming dramatically more complicated. This assessment mainly depends on theproperties of the construction itself, more precisely on the degree of complexity of its modal model, as well on available measurement or simulation data, and possible interaction of those supporting structure elements which can reveal non-linear characteristics. \u0000In this paper we will propose solutions to this problem in the form of so-called adequacy intervals of the supporting structure dynamic characteristics, with relevant transformation of those characteristics, and will present a novel concept how to incorporate those characteristics to the rotor line dynamics, based on a so-called weight functions proportional to the vibration spectrum of the supports. The proposed concept can be of extreme value for defining defect-symptom relations, to be used in a new and rapidly developing discipline of science bearing the name of the model based diagnostics.","PeriodicalId":344275,"journal":{"name":"New Ideas Concerning Science and Technology Vol. 7","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132435823","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 : 2021-02-22DOI: 10.9734/bpi/nicst/v7/2709d
Benicha Mohamed, Mrabet Rachid, Azmani Amina
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Pub Date : 2021-02-22DOI: 10.9734/BPI/NICST/V7/1580C
Nik Hashim, W. Zulkiffli, Abdullah Muhammed Yusoff, Harnidah Samengon, Eni Noreni Mohamad Zain, Siti Rohana Mohamad, Shah Iskandar Fahmie Ramlee, Z. Awang
The aims of this study is to examine the influences that may affect the intentions of tourist behavior using GrabPay. For that purpose, this study was conducted in the Klang Valley area in Selangor, Malaysia. Self-administered questionnaires were selected for this study to collect data from tourists in the Klang Valley district. About 220 questionnaires were distributed to tourists using convenience sampling techniques. As a result, among the factors shown to influence tourist behavioral intentions to use GrabPay are perceived usefulness and trust. Furthermore, trust is the highest positive dominant influence that influences the behavior of tourists using GrabPay. This current study is beneficial for policy makers and tourism operators in Malaysia. In addition, the results of this study have provided evidence data for tourism operators in Malaysia to outline a promotional approach that can attract more tourists to visit Malaysia in the future
{"title":"The Factors Influencing Tourists’ Behavioural Intention-to-Use Grab Pay Application","authors":"Nik Hashim, W. Zulkiffli, Abdullah Muhammed Yusoff, Harnidah Samengon, Eni Noreni Mohamad Zain, Siti Rohana Mohamad, Shah Iskandar Fahmie Ramlee, Z. Awang","doi":"10.9734/BPI/NICST/V7/1580C","DOIUrl":"https://doi.org/10.9734/BPI/NICST/V7/1580C","url":null,"abstract":"The aims of this study is to examine the influences that may affect the intentions of tourist behavior using GrabPay. For that purpose, this study was conducted in the Klang Valley area in Selangor, Malaysia. Self-administered questionnaires were selected for this study to collect data from tourists in the Klang Valley district. About 220 questionnaires were distributed to tourists using convenience sampling techniques. As a result, among the factors shown to influence tourist behavioral intentions to use GrabPay are perceived usefulness and trust. Furthermore, trust is the highest positive dominant influence that influences the behavior of tourists using GrabPay. This current study is beneficial for policy makers and tourism operators in Malaysia. In addition, the results of this study have provided evidence data for tourism operators in Malaysia to outline a promotional approach that can attract more tourists to visit Malaysia in the future","PeriodicalId":344275,"journal":{"name":"New Ideas Concerning Science and Technology Vol. 7","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129253026","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}
A. Marian, B. Stephen, K. Antwi, K. Frederick, Farhad Analoui, Mireku Dickson, Amu-Mensah Saraphina
Freshwater governance (policy formulation and implementation) are usually undertaken with little consideration to the thought process of the owners of the resources and resource environment. Even though considerable efforts have been made to the social change theory by incorporating stakeholder’s views, the individual-level or local-level insights as well as constructs and environmental connections (cognitive view) in freshwater challenges are usually left out. Using the case study research design, with emphasis on the descriptive design helped to access local knowledge in freshwater governance. The mixed method approach, helped to put together information based on behavioural concerns, the spirituality of the people, and the resource environmental issues required for the analysis and discussion of the data, while drawing meaningful conclusion from data. The results provide a framework, which will help to address interventions that simultaneously address both development and behavioural determinants of freshwater degradation, toward social change conservation policy in reducing crisis in freshwater governance.
{"title":"Knowledge Relationships in Freshwater Governance","authors":"A. Marian, B. Stephen, K. Antwi, K. Frederick, Farhad Analoui, Mireku Dickson, Amu-Mensah Saraphina","doi":"10.4236/SM.2019.93015","DOIUrl":"https://doi.org/10.4236/SM.2019.93015","url":null,"abstract":"Freshwater governance (policy formulation and implementation) are usually undertaken with little consideration to the thought process of the owners of the resources and resource environment. Even though considerable efforts have been made to the social change theory by incorporating stakeholder’s views, the individual-level or local-level insights as well as constructs and environmental connections (cognitive view) in freshwater challenges are usually left out. Using the case study research design, with emphasis on the descriptive design helped to access local knowledge in freshwater governance. The mixed method approach, helped to put together information based on behavioural concerns, the spirituality of the people, and the resource environmental issues required for the analysis and discussion of the data, while drawing meaningful conclusion from data. The results provide a framework, which will help to address interventions that simultaneously address both development and behavioural determinants of freshwater degradation, toward social change conservation policy in reducing crisis in freshwater governance.","PeriodicalId":344275,"journal":{"name":"New Ideas Concerning Science and Technology Vol. 7","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130084939","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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