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RISS 인기검색어
- 검색키워드
- 저자 : Jyoti Sinha (검색결과 6 건)
- 무료
- 기관 내 무료
- 유료
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Bi-spectrum for identifying crack and misalignment in shaft of a rotating machine
Jyoti K. Sinha 국제구조공학회 2006 Smart Structures and Systems, An International Jou Vol.2 No.1
Bi-spectrum is a tool in the signal processing for identification of non-linear dynamic behvaiour in systems, and well-known for stationary system where components are non-linearly interacting. Breathing of a crack during shaft rotation is also exhibits a non-linear behaviour. The crack is known to generate 2X (twice the machine RPM) and higher harmonics in addition to 1X component in the shaft response during its rotation. Misaligned shaft also shows similar such feature as a crack in a shaft. The bi-spectrum method has now been applied on a small rotating rig to observe its features. The bi-spectrum results are found to be encouraging to distinguish these faults based on few experiments conducted on a small rig. The results are presented here.
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Seismic qualification using the updated finite element model of structures
Jyoti K. Sinha,A. Rama Rao,R. K. Sinha 국제구조공학회 2005 Structural Engineering and Mechanics, An Int'l Jou Vol.19 No.1
The standard practice is to seismically qualify the safety related equipment and structural components used in the nuclear power plants. Among several qualification approaches the qualification by the analysis using finite element (FE) method is the most common approach used in practice. However the predictions by the FE model for a structure is known to show significant deviations from the dynamic behaviour of ‘as installed’ structure in many cases. Considering such limitation, few researchers have advocated re-qualification of such structures after installation at site to enhance the confidence in qualification vis-à-vis plant safety. For such an exercise the validation of FE model with experimental modal data is important. A validated FE model can be obtained by the Model Updating methods in conjugation with the in-situ experimental modal data. Such a model can then be used for qualification. Seismic analysis using the updated FE model and its advantage has been presented through an example of an in-core component − a perforated horizontal tube of a nuclear reactor.
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Seismic qualification using the updated finite element model of structures
Sinha, Jyoti K.,Rao, A. Rama,Sinha, R.K. Techno-Press 2005 Structural Engineering and Mechanics, An Int'l Jou Vol.19 No.1
The standard practice is to seismically qualify the safety related equipment and structural components used in the nuclear power plants. Among several qualification approaches the qualification by the analysis using finite element (FE) method is the most common approach used in practice. However the predictions by the FE model for a structure is known to show significant deviations from the dynamic behaviour of 'as installed' structure in many cases. Considering such limitation, few researchers have advocated re-qualification of such structures after installation at site to enhance the confidence in qualification vis-$\grave{a}$-vis plant safety. For such an exercise the validation of FE model with experimental modal data is important. A validated FE model can be obtained by the Model Updating methods in conjugation with the in-situ experimental modal data. Such a model can then be used for qualification. Seismic analysis using the updated FE model and its advantage has been presented through an example of an in-core component - a perforated horizontal tube of a nuclear reactor.
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Bi-spectrum for identifying crack and misalignment in shaft of a rotating machine
Sinha, Jyoti K. Techno-Press 2006 Smart Structures and Systems, An International Jou Vol.2 No.1
Bi-spectrum is a tool in the signal processing for identification of non-linear dynamic behvaiour in systems, and well-known for stationary system where components are non-linearly interacting. Breathing of a crack during shaft rotation is also exhibits a non-linear behaviour. The crack is known to generate 2X (twice the machine RPM) and higher harmonics in addition to 1X component in the shaft response during its rotation. Misaligned shaft also shows similar such feature as a crack in a shaft. The bi-spectrum method has now been applied on a small rotating rig to observe its features. The bi-spectrum results are found to be encouraging to distinguish these faults based on few experiments conducted on a small rig. The results are presented here.
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Bézier variant of mixed summation-integral type operators
Dewangan,Jyoti Sinha 장전수학회 2010 Advanced Studies in Contemporary Mathematics Vol.20 No.2
The present paper deals with Bezier variant of certain mixed summation-integral type operators, having different basis functions in sum-mation and integration. We estimate the rate of convergence for these op-erators Sn,α(f, x), for functions having derivatives of bounded variation.
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Asnaashari, Erfan,Sinha, Jyoti K. Techno-Press 2014 Structural monitoring and maintenance Vol.1 No.3
Detection of fatigue cracks at an early stage of their development is important in structural health monitoring. The breathing of cracks in a structure generates higher harmonic components of the exciting frequency in the frequency spectrum. Previously, the residual operational deflection shape (R-ODS) method was successfully applied to beams with a single crack. The method is based on the ODSs at the exciting frequency and its higher harmonic components which consider both amplitude and phase information of responses to map the deflection pattern of structures. Although the R-ODS method shows the location of a single crack clearly, its identification for the location of multiple cracks in a structure is not always obvious. Therefore, an improvement to the R-ODS method is presented here to make the identification process distinct for the beams with multiple cracks. Numerical and experimental examples are utilised to investigate the effectiveness of the improved method.
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