Pub Date : 2015-05-20DOI: 10.15961/J.JSUESE.2015.03.023
Wenjing Zhang, Wei Chen, Pei Li, Rixiu Men
Ring speed ratio and whirl ratio of shaft are critical indicators of power consumption and stability of floating ring bearing for turbocharger rotor system supporting. Based on the classic short bearing method,an analytical model of nonlinear dynamic oil-film force of floating ring bearing was presented,and precession angular velocities of floating ring and shaft were token into account in this model.The curves of ring speed ratio-shaft rotating speed and whirl ratio of shaft-shaft rotating speed were got. At different rotating speeds,the dynamic influence mechanisms of system parameters,i. e. eccentric mass,lubricant viscosity,structural parameters of floating ring bearing on speed ratio,and the sensitivity of speed ratio to parameters were studied. The results could be used as an reference to the RD design of floating ring bearing and system performance evaluation of turbocharger rotor system.
{"title":"Dynamic effects of system parameters on speed ratio of floating ring bearing","authors":"Wenjing Zhang, Wei Chen, Pei Li, Rixiu Men","doi":"10.15961/J.JSUESE.2015.03.023","DOIUrl":"https://doi.org/10.15961/J.JSUESE.2015.03.023","url":null,"abstract":"Ring speed ratio and whirl ratio of shaft are critical indicators of power consumption and stability of floating ring bearing for turbocharger rotor system supporting. Based on the classic short bearing method,an analytical model of nonlinear dynamic oil-film force of floating ring bearing was presented,and precession angular velocities of floating ring and shaft were token into account in this model.The curves of ring speed ratio-shaft rotating speed and whirl ratio of shaft-shaft rotating speed were got. At different rotating speeds,the dynamic influence mechanisms of system parameters,i. e. eccentric mass,lubricant viscosity,structural parameters of floating ring bearing on speed ratio,and the sensitivity of speed ratio to parameters were studied. The results could be used as an reference to the RD design of floating ring bearing and system performance evaluation of turbocharger rotor system.","PeriodicalId":17032,"journal":{"name":"Journal of Sichuan University","volume":"99 1","pages":"160-166"},"PeriodicalIF":0.0,"publicationDate":"2015-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85491112","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 : 2010-09-01DOI: 10.15961/J.JSUESE.2010.05.013
R. Wong, Qianbing Zhang, K. Cheung
Coplanar and stepped buried reverse faults were carried out to study the relationship between faults movement and surface rupture appearing in soil layer using geomechanical model test.Furthermore,the Gaoyuan Bridge damaged during Wenchuan Earthquake was taken as an example to study the effect of fault propagation on bridge foundation by changing the arrangement of the bridge to these two types of faults.Digital speckle correlation method and high speed camera were used to observe and analyze the process of the fault movement.We have studied the effect of fault dip angles and loading rates.The research results indicated that the failure process of discontinues reverse faults can be divided into four stages:elastic stage,fault coalescence stage,sliding stage and failure stage.The width of surface rupture zone,the uplifts of bedrock and sediment layer were statistics,which indicated the width of surface rupture zone and the uplift of the coplanar type were greater than the stepped one.The larger the fault dip angle,the wider the surface rupture zone was resulted.The uplift of bedrock was greater than the uplift of soil layer.The bridge perpendicular to the fault was damaged and no damage to the parallel one.
{"title":"Geomechanical Model Testing of Surface Rupture and Bridge Damage Produced by Discontinuous Reverse Faults","authors":"R. Wong, Qianbing Zhang, K. Cheung","doi":"10.15961/J.JSUESE.2010.05.013","DOIUrl":"https://doi.org/10.15961/J.JSUESE.2010.05.013","url":null,"abstract":"Coplanar and stepped buried reverse faults were carried out to study the relationship between faults movement and surface rupture appearing in soil layer using geomechanical model test.Furthermore,the Gaoyuan Bridge damaged during Wenchuan Earthquake was taken as an example to study the effect of fault propagation on bridge foundation by changing the arrangement of the bridge to these two types of faults.Digital speckle correlation method and high speed camera were used to observe and analyze the process of the fault movement.We have studied the effect of fault dip angles and loading rates.The research results indicated that the failure process of discontinues reverse faults can be divided into four stages:elastic stage,fault coalescence stage,sliding stage and failure stage.The width of surface rupture zone,the uplifts of bedrock and sediment layer were statistics,which indicated the width of surface rupture zone and the uplift of the coplanar type were greater than the stepped one.The larger the fault dip angle,the wider the surface rupture zone was resulted.The uplift of bedrock was greater than the uplift of soil layer.The bridge perpendicular to the fault was damaged and no damage to the parallel one.","PeriodicalId":17032,"journal":{"name":"Journal of Sichuan University","volume":"40 1","pages":"58-67"},"PeriodicalIF":0.0,"publicationDate":"2010-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81086684","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 : 2009-01-01DOI: 10.1007/978-3-540-89465-0_305
Minquan Feng, Bangmin Zheng
{"title":"Auto Up-Wind and Skew Up-Wind Numerical Solution of 3D Convection-Diffusion Equation under High Reynods Number","authors":"Minquan Feng, Bangmin Zheng","doi":"10.1007/978-3-540-89465-0_305","DOIUrl":"https://doi.org/10.1007/978-3-540-89465-0_305","url":null,"abstract":"","PeriodicalId":17032,"journal":{"name":"Journal of Sichuan University","volume":"1 1","pages":"1773-1777"},"PeriodicalIF":0.0,"publicationDate":"2009-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79917904","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}
The equilibrium geometries of two electronic states(the ground state X2∑+,the first degenerate state A2∏) of MgH molecule have been calculated using the method of Symmetry Adapted Cluster-Configuration Interaction(SAC-CI) and the Quadratic CI method including Single and Double substitutions(QCISD(T)) with the basis sets cc-PVQZ,aug-cc-PVTZ,6-311++g and 6-311++g(3df,2pd).Comparing among the above mentioned four basis sets,the conclusion is gained that the basis set 6-311++g(3df,2pd) is the most suitable for the energy calculation of MgH molecule.The whole potential curves for these electronic states are further scanned using QCISD(T)/6-311++g(3df,2pd) method for the ground state and SAC-CI/6-311++g(3df,2pd) method for the excited states.The potential energy functions and relevant spectrum constants(ωe,ωeχe,Be,αe) of these states are obtained by fitting to the Murrell-Sorbie function and the modified Murrell-Sorbie+c6 function,respectively.The results show that the spectrum constants derived from the modified Murrell-Sorbie+c6 function are in very good agreement with the experimental data,which indicate that the modified Murrell-Sorbie+c6 function can correctly present the potential energy function of the ground state and the first degenerate state of MgH molecule.
{"title":"Analytical potential energy function for the electronic states X~2∑~+,A~2∏ of MgH molecule","authors":"L.-Y. Rong","doi":"10.7498/aps.57.816","DOIUrl":"https://doi.org/10.7498/aps.57.816","url":null,"abstract":"The equilibrium geometries of two electronic states(the ground state X2∑+,the first degenerate state A2∏) of MgH molecule have been calculated using the method of Symmetry Adapted Cluster-Configuration Interaction(SAC-CI) and the Quadratic CI method including Single and Double substitutions(QCISD(T)) with the basis sets cc-PVQZ,aug-cc-PVTZ,6-311++g and 6-311++g(3df,2pd).Comparing among the above mentioned four basis sets,the conclusion is gained that the basis set 6-311++g(3df,2pd) is the most suitable for the energy calculation of MgH molecule.The whole potential curves for these electronic states are further scanned using QCISD(T)/6-311++g(3df,2pd) method for the ground state and SAC-CI/6-311++g(3df,2pd) method for the excited states.The potential energy functions and relevant spectrum constants(ωe,ωeχe,Be,αe) of these states are obtained by fitting to the Murrell-Sorbie function and the modified Murrell-Sorbie+c6 function,respectively.The results show that the spectrum constants derived from the modified Murrell-Sorbie+c6 function are in very good agreement with the experimental data,which indicate that the modified Murrell-Sorbie+c6 function can correctly present the potential energy function of the ground state and the first degenerate state of MgH molecule.","PeriodicalId":17032,"journal":{"name":"Journal of Sichuan University","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2008-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78043669","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 : 2006-10-20DOI: 10.1007/S11432-006-2023-5
Zhang Zhi-zhong
{"title":"On Preemptive Scheduling of Optical Switches with Configuration Delay","authors":"Zhang Zhi-zhong","doi":"10.1007/S11432-006-2023-5","DOIUrl":"https://doi.org/10.1007/S11432-006-2023-5","url":null,"abstract":"","PeriodicalId":17032,"journal":{"name":"Journal of Sichuan University","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2006-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73252682","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 : 2006-07-01DOI: 10.1142/9789812773159_0033
Zhang Qing-de
Suppose that f(z) is a non-constant meromorphic function in the complex plane satisfying N_(1))(r,f)=S(r,f) and d is a non-zero constant.Then the author proves thatT(r,f)11N(r,f)+11N(r,f′+df-1)+S(r,f),except that f(z) is one of the following forms:(i) Ae~(-dz);(ii) d(Ae~(-dz)+1)~2;(iii) d(Ae~(-2z)-1)~2;(iv) Ae~(dz)(e~(-dz)+2dA)~2,where A is a non-zero constant.
{"title":"An Improved Inequality for Meromorphic Functions with Few Simple Zeros","authors":"Zhang Qing-de","doi":"10.1142/9789812773159_0033","DOIUrl":"https://doi.org/10.1142/9789812773159_0033","url":null,"abstract":"Suppose that f(z) is a non-constant meromorphic function in the complex plane satisfying N_(1))(r,f)=S(r,f) and d is a non-zero constant.Then the author proves thatT(r,f)11N(r,f)+11N(r,f′+df-1)+S(r,f),except that f(z) is one of the following forms:(i) Ae~(-dz);(ii) d(Ae~(-dz)+1)~2;(iii) d(Ae~(-2z)-1)~2;(iv) Ae~(dz)(e~(-dz)+2dA)~2,where A is a non-zero constant.","PeriodicalId":17032,"journal":{"name":"Journal of Sichuan University","volume":"16 1","pages":"320-327"},"PeriodicalIF":0.0,"publicationDate":"2006-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77899740","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 : 2005-01-01DOI: 10.4028/0-87849-410-3.101
Z. Ji
Infrared-to-visible upconversion phosphors Y_2O_3∶Yb, Er and Gd_2O_3∶Yb, Er with narrow size distribution were synthezed by using a stable microemulsion system, which included triton x-100,n-hexanol, cyclohexane and water. Appearance-controllable nanocrystals were achieved by adjusting the ratios of assistant surfactant and surfactant. These upconversion phosphors may be used as fluorescent labels for the sensitive detection of biomolecule, immunoassay or DNA assys. The x-ray diffraction (XRD) patterns of the samples showed that the powders were cubic phases of Y_2O_3 and Gd_2O_3, respectively. After calcination with different temperature settings in air atmosphere, the particles were spherical through the observation by scanning electronic microscopy (SEM). Red and green upconversion luminescence was obtained under 980 nm infrared excitation. Several contributions to the intensity of upconversion emission were also investigated.
{"title":"Synthesis and Characteristics of Infrared-to-Visible Upconversion Nanoparticles Through a Microemulsion System","authors":"Z. Ji","doi":"10.4028/0-87849-410-3.101","DOIUrl":"https://doi.org/10.4028/0-87849-410-3.101","url":null,"abstract":"Infrared-to-visible upconversion phosphors Y_2O_3∶Yb, Er and Gd_2O_3∶Yb, Er with narrow size distribution were synthezed by using a stable microemulsion system, which included triton x-100,n-hexanol, cyclohexane and water. Appearance-controllable nanocrystals were achieved by adjusting the ratios of assistant surfactant and surfactant. These upconversion phosphors may be used as fluorescent labels for the sensitive detection of biomolecule, immunoassay or DNA assys. The x-ray diffraction (XRD) patterns of the samples showed that the powders were cubic phases of Y_2O_3 and Gd_2O_3, respectively. After calcination with different temperature settings in air atmosphere, the particles were spherical through the observation by scanning electronic microscopy (SEM). Red and green upconversion luminescence was obtained under 980 nm infrared excitation. Several contributions to the intensity of upconversion emission were also investigated.","PeriodicalId":17032,"journal":{"name":"Journal of Sichuan University","volume":"140 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2005-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75477893","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 : 2004-05-01DOI: 10.1142/9789812702654_0139
Jin-Ding He, Xianyong Xiao, Honggeng Yang
As currently there are various data processing methods in power quality monitoring system, this paper put forward a new data processing method based on data pre-processing, reasonable choice of time interval for analysis and generating daily statistical file. According to IEC international standard, it is effective to get clear and explicit graphs and quickly generate different statistical reports in controlling center by adopting the effective measuring time in collecting apparatus and reading the data file of monitoring spot in accordance with appointed format in monitoring system. With this method of data processing, the whole monitoring system of power quality can be effectively applied in practical project.
{"title":"Data Processing Method in Power Quality Monitoring System","authors":"Jin-Ding He, Xianyong Xiao, Honggeng Yang","doi":"10.1142/9789812702654_0139","DOIUrl":"https://doi.org/10.1142/9789812702654_0139","url":null,"abstract":"As currently there are various data processing methods in power quality monitoring system, this paper put forward a new data processing method based on data pre-processing, reasonable choice of time interval for analysis and generating daily statistical file. According to IEC international standard, it is effective to get clear and explicit graphs and quickly generate different statistical reports in controlling center by adopting the effective measuring time in collecting apparatus and reading the data file of monitoring spot in accordance with appointed format in monitoring system. With this method of data processing, the whole monitoring system of power quality can be effectively applied in practical project.","PeriodicalId":17032,"journal":{"name":"Journal of Sichuan University","volume":"27 1","pages":"944-950"},"PeriodicalIF":0.0,"publicationDate":"2004-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90357538","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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