Solid-state wave gyroscope is one kind of high-performance vibrating gyroscopes. The present work develops a new type of solid-state wave gyroscope—a ring vibrating gyroscope driven by piezo-electrodes located on the...Solid-state wave gyroscope is one kind of high-performance vibrating gyroscopes. The present work develops a new type of solid-state wave gyroscope—a ring vibrating gyroscope driven by piezo-electrodes located on the sidewall of the structure. It has advantages of large vibrating amplitude, high energy conversion efficiency and compact structure. The working principle of the piezoelectric ring vibrating gyroscope is based on the inertia effect of the standing wave in the axisymmetric resonator caused by Coriolis force. The finite element method(FEM) analysis has been implemented to characterize the ring type resonator. The prototypal gyroscope was manufactured and has been trimmed by mechanical way. The harmonic response of the ring vibrating gyroscope has been tested. The resonating frequency of the ring type resonator is 3715.6 Hz and the frequency split of the two working modes before trimming was about 5 Hz and was reduced to sub-0.01 Hz after trimming procedure. The Q-factor of the ring type resonator was 2504. Then, the turntable experiment was implemented. The measured scale factor k is 9.24 m V/[(°)·s] and the full scale range of the gyroscope is larger than ±300(°)/s.展开更多
This paper is divided into two parts： a reflection about the diachronical and dialectical relationship between the ＂Art of Construction＂ and the ＂Building Science＂, in terms of capability to evaluate structural c...This paper is divided into two parts： a reflection about the diachronical and dialectical relationship between the ＂Art of Construction＂ and the ＂Building Science＂, in terms of capability to evaluate structural characteristics and conservative conditions of traditional buildings, especially for buildings of historical or artistic value, using a peculiar approach for planning modem construction （Building Science） or the ancient complex of rules and logics to which a specific building monumental pertains （Art of Construction）. The second part reports a case study of application of this second methodology of approach, concerning the St. Mary＇s Church of the Immaculate Conception of Montecalvario in Naples, an important monumental church situated into the historic centre of Naples, built between 1718 and 1726 by one of the greatest Italian architects of the XVIII century, Domenico Antonio Vaccaro. The building, that presents all the structural and lexical peculiarities of Neapolitan Baroque （central plan, altimetric development of concentric volumes, plastic virtuosity of structural and formal apparatuses）, finds in its formal conception and in its stylistic conception part of its structural vulnerabilities. The study examines the understanding of cracks affecting the Church, also in relation to around historic buildings, in order to determine a diagnosis and to understand how this condition of structural vulnerability could be combined with future seismic strain, having high local seismicity and damages suffered during the earthquakes of the last three centuries.展开更多
The tide of reform and opening up promotes the rapid development of science and technology in our society, and citizens have not only wimessed great improvement in basic material living conditions, but also have lived...The tide of reform and opening up promotes the rapid development of science and technology in our society, and citizens have not only wimessed great improvement in basic material living conditions, but also have lived a fulfilled spiritual life. Material wealth stimulates self- awareness of rights protection of the citizens, and that＇s the issue of civil rights that we need to carry out in-depth studies on. As important rights of citizens, how can civil rights gain effective legal protection and how citizens themselves fully and effectively exercise the rights are problems asking for attention in the study of civil rights. Civil rights are not only the issue of inherence and existence, and we should also pay attention to its development or whether there is sustainable development. Moreover, how long this sustainability could last is also the issue of sustainable civil rights this thesis is going to discuss.展开更多
This study focuses on the role of researcher/academia in making low carbon policy in the UK. UK researchers and universities enjoy relatively high degree of independence of their research from the government due to it...This study focuses on the role of researcher/academia in making low carbon policy in the UK. UK researchers and universities enjoy relatively high degree of independence of their research from the government due to its statute that guarantees its independence （＂The Haldene Principle＂）. In addition, there was a recent movement for evidence-based policy in the UK, which requires more economic and scientific robustness, therefore role of engineers and social scientists are increasingly important. In particular, social science will have a greater role in changing people＇s behavior with high level of uncertainty. UK businesses have played a leading role to move forward the climate policy such as UKETS （United Kingdom Emissions Trading Scheme） as well as low carbon policy. The regular communication and consultation is a crucial basis for making integrated policy, which involves wide range of stakeholders. The legally binding targets set out by Climate Change Act 2008 required structural change of the government to implement the necessary policies and measures especially by integrating climate and energy policy.展开更多
A three node C^0 continuous isoparametric beam element is formulated to model the curved pipe conveying fluid in three dimensional configuration.The equations of motion for the combined structure and fluid domain incl...A three node C^0 continuous isoparametric beam element is formulated to model the curved pipe conveying fluid in three dimensional configuration.The equations of motion for the combined structure and fluid domain including added mass effect,Coriolis effect,centrifugal effect and the effect of pressure on the walls of pipe have been developed by Paidoussis.This equation is converted to finite element formulation using Galerkin technique and is validated with the results available from literature.展开更多
基金Projects(51335011,51275522)supported by the National Natural Science Foundation of ChinaProject(HPCM-2013-08)supported by Key Lab Open Foundation of State Key Laboratory of High Performance(Complex Manufacturing),Central South University,China
文摘Solid-state wave gyroscope is one kind of high-performance vibrating gyroscopes. The present work develops a new type of solid-state wave gyroscope—a ring vibrating gyroscope driven by piezo-electrodes located on the sidewall of the structure. It has advantages of large vibrating amplitude, high energy conversion efficiency and compact structure. The working principle of the piezoelectric ring vibrating gyroscope is based on the inertia effect of the standing wave in the axisymmetric resonator caused by Coriolis force. The finite element method(FEM) analysis has been implemented to characterize the ring type resonator. The prototypal gyroscope was manufactured and has been trimmed by mechanical way. The harmonic response of the ring vibrating gyroscope has been tested. The resonating frequency of the ring type resonator is 3715.6 Hz and the frequency split of the two working modes before trimming was about 5 Hz and was reduced to sub-0.01 Hz after trimming procedure. The Q-factor of the ring type resonator was 2504. Then, the turntable experiment was implemented. The measured scale factor k is 9.24 m V/[(°)·s] and the full scale range of the gyroscope is larger than ±300(°)/s.
文摘This paper is divided into two parts： a reflection about the diachronical and dialectical relationship between the ＂Art of Construction＂ and the ＂Building Science＂, in terms of capability to evaluate structural characteristics and conservative conditions of traditional buildings, especially for buildings of historical or artistic value, using a peculiar approach for planning modem construction （Building Science） or the ancient complex of rules and logics to which a specific building monumental pertains （Art of Construction）. The second part reports a case study of application of this second methodology of approach, concerning the St. Mary＇s Church of the Immaculate Conception of Montecalvario in Naples, an important monumental church situated into the historic centre of Naples, built between 1718 and 1726 by one of the greatest Italian architects of the XVIII century, Domenico Antonio Vaccaro. The building, that presents all the structural and lexical peculiarities of Neapolitan Baroque （central plan, altimetric development of concentric volumes, plastic virtuosity of structural and formal apparatuses）, finds in its formal conception and in its stylistic conception part of its structural vulnerabilities. The study examines the understanding of cracks affecting the Church, also in relation to around historic buildings, in order to determine a diagnosis and to understand how this condition of structural vulnerability could be combined with future seismic strain, having high local seismicity and damages suffered during the earthquakes of the last three centuries.
文摘The tide of reform and opening up promotes the rapid development of science and technology in our society, and citizens have not only wimessed great improvement in basic material living conditions, but also have lived a fulfilled spiritual life. Material wealth stimulates self- awareness of rights protection of the citizens, and that＇s the issue of civil rights that we need to carry out in-depth studies on. As important rights of citizens, how can civil rights gain effective legal protection and how citizens themselves fully and effectively exercise the rights are problems asking for attention in the study of civil rights. Civil rights are not only the issue of inherence and existence, and we should also pay attention to its development or whether there is sustainable development. Moreover, how long this sustainability could last is also the issue of sustainable civil rights this thesis is going to discuss.
文摘This study focuses on the role of researcher/academia in making low carbon policy in the UK. UK researchers and universities enjoy relatively high degree of independence of their research from the government due to its statute that guarantees its independence （＂The Haldene Principle＂）. In addition, there was a recent movement for evidence-based policy in the UK, which requires more economic and scientific robustness, therefore role of engineers and social scientists are increasingly important. In particular, social science will have a greater role in changing people＇s behavior with high level of uncertainty. UK businesses have played a leading role to move forward the climate policy such as UKETS （United Kingdom Emissions Trading Scheme） as well as low carbon policy. The regular communication and consultation is a crucial basis for making integrated policy, which involves wide range of stakeholders. The legally binding targets set out by Climate Change Act 2008 required structural change of the government to implement the necessary policies and measures especially by integrating climate and energy policy.
基金supported by All India Council for Technical Education[RPS grant No:8023/RID/RPS-24/2011-12]
文摘A three node C^0 continuous isoparametric beam element is formulated to model the curved pipe conveying fluid in three dimensional configuration.The equations of motion for the combined structure and fluid domain including added mass effect,Coriolis effect,centrifugal effect and the effect of pressure on the walls of pipe have been developed by Paidoussis.This equation is converted to finite element formulation using Galerkin technique and is validated with the results available from literature.
