检索结果-南通市图书馆

在线全文

cnki会议

学校读者我要写书评

暂无评论

迷宫堰频率群分析

水力发电学报 2004年第2期23卷 32-34页

作者：张社荣王海军贾树宝天津大学建筑工程学院天津300072 河南省新乡水利设计院新乡453000

本文应用有限元方法对迷宫堰的振动特性进行分析 ,发现迷宫堰整体模型中出现了频率群的现象。从工程实用角度出发 ,我们由迷宫堰单宫的频率值和单片堰墙模态相似推出整体模型有限元计算结果中频率群的每群个数 ,并且取频率群的均值作为... 详细信息

本文应用有限元方法对迷宫堰的振动特性进行分析 ,发现迷宫堰整体模型中出现了频率群的现象。从工程实用角度出发 ,我们由迷宫堰单宫的频率值和单片堰墙模态相似推出整体模型有限元计算结果中频率群的每群个数 ,并且取频率群的均值作为代表值。通过与水弹实验数据的对比 ,认为该代表值在结构的低阶频率区域是可用的。

关键词：水力学迷宫堰频率群水弹实验模态

在线全文

学校读者我要写书评

暂无评论

最优化技术的高速叉车车身转动惯量辨识方法

系统仿真学报 2009年第16期21卷 5072-5074,5079页

作者：王勇丁渭平何森东总后勤部建筑工程研究所西安710032 西南交通大学机械工程学院成都610031

针对某型高速叉车底盘与车身匹配分析的虚拟样机,为确保其仿真分析的置信度,依托整车平顺性测试结果,采用最优化技术辨识车身转动惯量并用于虚拟样机的修正。具体地,一方面,由整车平顺性测试结果中获得其前、后悬架系统悬挂质量部分的... 详细信息

针对某型高速叉车底盘与车身匹配分析的虚拟样机,为确保其仿真分析的置信度,依托整车平顺性测试结果,采用最优化技术辨识车身转动惯量并用于虚拟样机的修正。具体地,一方面,由整车平顺性测试结果中获得其前、后悬架系统悬挂质量部分的固有频率,即偏频。另一方面,将车身转动惯量视为参数化变量,建立参数化的车身振动分析之理论模型。进而,基于理论模型计算而再次得到前、后悬架系统偏频,并优化车身转动惯量的参数化取值,最终使悬架偏频的理论计算结果与相应的测试结果趋于吻合,此时的车身转动惯量取值即为最终的辨识结果,由此大大提高了这一建模所需关键性基础数据的精确性。而相关的整车动态测试结果则验证了所提方法的有效性。

关键词：高速叉车虚拟样机车身转动惯量辨识

Design and analysis of a disc-type of traveling wave ultrasonic motor with fixing inner side

在线全文

学校读者我要写书评

暂无评论

Design and analysis of a disc-type of traveling wave ultraso...

2011年全国压电和声波理论及器件应用研讨会

作者： Xiu TIAN~1,Jian-jun QU~2,Jian-chun Li~1,Yued-ong LANG~1,Yan-li wang~1 1 Beijing Aerospace Control Device institute,Beijing 100039,china 2 School of Mechatronics engineering,Harbin institute of Technology,Harbin 150001,china

Using B vibrating mode and fixing inner side of stator,a new disc-type of traveling wave ultrasonic motor (TWUSM) was *** element method was introduced to simulate the vibrating mode of stator, considering structure f... 详细信息

关键词： Traveling wave ultrasonic motor Finite element method vibration

叶片丢失激励下航空发动机柔性转子系统的动力学响应

在线全文

cnki会议

学校读者我要写书评

暂无评论

航空动力学报 2018年第2期33卷 257-264页

作者：洪杰栗天壤王永锋马艳红北京航空航天大学能源与动力工程学院北京100191 先进航空发动机协同创新中心北京100191

为揭示叶片丢失激励下转子系统动力学响应特征,考虑涡扇发动机低压转子刚度/质量分布特征、载荷传递特征、转静件耦合特征等,建立了高速柔性悬臂转子系统动力学模型。对突加不平衡激励及持续碰摩约束下转子系统动力学响应特性进行分析... 详细信息

为揭示叶片丢失激励下转子系统动力学响应特征,考虑涡扇发动机低压转子刚度/质量分布特征、载荷传递特征、转静件耦合特征等,建立了高速柔性悬臂转子系统动力学模型。对突加不平衡激励及持续碰摩约束下转子系统动力学响应特性进行分析。结果表明:所建立转子动力学模型可以有效反映叶片丢失激励下转子冲击振动和复杂简谐振动响应特征。在突加不平衡激励下转子系统的瞬态振动响应加剧,具有显著冲击响应特征,并伴有转子横向固有振动。持续碰摩所产生的约束作用可使转子临界转速发生变化,虽然响应幅值降低,但频率成分及转子振动趋于复杂。

关键词：叶片丢失柔性转子动力学响应冲击效应碰摩

An optimized time-adaptive aerothermal coupling calculation method for aerothermal analysis of disc cavity system

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of aeronautics 2024年第9期37卷 164-177页

作者： Shuai BI Junkui MAO Lei wang Feng HAN College of Energy and Power engineering Nanjing University of Aeronautics and AstronauticsNanjing 20016China AECC Aeroengine Control System institute Wuxi 214063China Integrated Energy institute Nanjing University of Aeronautics and AstronauticsNanjing 210016China

In order to further achieve the balance between the calculation accuracy and efficiency of the transient analysis of the aero-engine disc cavity system,an Optimized Time-adaptive Aerother-mal Coupling calculation(OTAC)method has been *** combines one-dimensional tran-sient calculation of air system,Conventional Sequence Staggered(CSS)method,Time-adaptive Aerothermal Coupling calculation(TAC)method and differential evolution optimization algorithm to obtain an efficient and high-precision aerothermal coupling calculation method of air *** both the heat conduction in the solid domain and the flow in the fluid domain as unsteady states in the OTAC,the interaction of fluid-solid information within a single coupling time step size was implemented based on the CSS ***,the coupling time step size was automatically adjusted with the number of iterations by using the Proportional-Integral-Deri vative(PID)*** show that when compared with the traditional loosely coupling method with a fixed time step size,the computational accuracy and efficiency of the OTAC method are improved by 8.9%and 30%,*** with the tight coupling calculation,the OTAC method can achieve a speedup of 1 to 2 orders of magnitude,while the calculation error is maintained within 6.1%.

关键词： Air system 1D-3D coupling Conjugate heat transfer Transient calculation Adaptive time step size

Quest for chirality in 107Ag

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Quest for chirality in 107Ag

第十三届全国核结构研讨会暨第九次全国“核结构与量子力学”专题讨论会

作者： HE Chuang-Ye~1 ZHANG Biao~(1,2) ZHU Li-Hua~(3,2) WU Xiao-Guang~1 SUN Hui-Bin~2 zheng Yun~1 wang Lie-Lin~(1,4) YU Bei-Bei~1 YAO Shun-He~1 LI Guang-Sheng~1 XU Chuan~5 wang Jian-Guo~6 GU Long~6 ZHANG Ming~6 1(china institute of Atomic Energy,Beijing 102413,china) 2(School of Science,Shenzhen univ.rsity,Shenzhen 518060,china) 3(School of physics and nuclear energy engineering,Beijing univ.rsity of aeronautics and astronautics,Beijing 100191,china) 4(Department of Physics,Jilin univ.rsity,Changchun 130023,china) 5(School of Physics and MOE key laboratory of Heavy Ion Physics,Peking univ.rsity,Beijing 100087,china) 6(Department of Physics,Tsinghua univ.rsity,Beijing 100084,china)

High-Spin states in nuclei at A～100 mass region have been extensively studied in the recent years. There exists plenty of interesting phenomena in their structure,such as shape co-existence,band termination, magnetic rotations,chiral rotations and so *** them,the chirality attracted much attention both by theoretician and *** the previous study,doublet bands structure was found in *** present work,its neighbouring isotope Ag is selected to quest for the chiral bands.

关键词： high spin states level scheme chirality

vibration coupling effects between two concentric cylindrical shells through periodic annular plates and entrained fluid

在线全文

cnki会议

学校读者我要写书评

暂无评论

Chinese Journal of Acoustics 2010年第4期29卷 331-345页

作者： YIN Xuewen wang Gongxian HUA Hongxing SHEN Rongying Wuxi Branch Jiangsu Institute of Special Equipment Safety Supervision and Inspection Wuxi 214171 State Key Lab. of Mechanical System and vibration Shanghai Jiaotong Univ. Shanghai 200240 School of Logistics engineering Wuhan University of Technology Wuhan 430063

The coupling effects on two concentric cylindrical shells with periodic annular plates as well as entrained fluid were investigated theoretically. Expressions for the reactive forces by the annular plates were derived on the assumption that only quasi-longitudinal waves exist in the annular plates and an analytical expression for the outer shell was developed. Comparisons of numerical results for infinite two-walled cylindrical shell to measured data for a cabin model are in good agreement. Numerical results were presented for analyzing the characteristics of the loadings due to the acoustic fluid and the periodic annular plates, and their influences on the outer shell＇s far field acoustic radiation.

关键词： mode vibration coupling effects between two concentric cylindrical shells through periodic annular plates and entrained fluid exp

Characteristics of a Hydraulic Relief Valve with a Specially Compensation Poppet

在线全文

学校读者我要写书评

暂无评论

Characteristics of a Hydraulic Relief Valve with a Specially...

2007工程机械与车辆工程新进展国际学术会议

作者： Yin Yaobao~1 wang Fei~1 Zhao Yanpei~1 Gao Zenghong~2 1.School of Mechanical engineering Tongji univ.rsity 1239 Siping Road Shanghai 200092 P.R.china 2.No.803 research institute Shanghai Aerospace Bureau 710 Yishan Road Shanghai 200233 P.R.china

＜正＞This paper describes the characteristics of a hydraulic relief valve with a special compensation poppet under the circumstance of vibration, temperature and specially *** modeling and analysis of the valve before the poppet opens or after the poppet opens are *** influences of the bulk modulus,vibration and temperature are *** theoretical results show that this relief valve has three functions of constant hydraulic pressure,noise elimination and vibration absorption in a component.

关键词： Hydraulics Fixed orifice Pressure sensing control chamber Poppet valve vibration Environment

在线全文

cnki会议

学校读者我要写书评

暂无评论

碎石沥青玛蹄脂路面的声振特性实验初探

同济大学学报（自然科学版） 2003年第3期31卷 370-373页

作者：杨玉明王佐民葛剑敏周海生同济大学声学研究所同济大学道路与机场工程系上海200092

为研究碎石沥青玛蹄脂 (SMA)路面的吸声和降振特性 ,分别测试SMA路面和一般沥青路面等多种试件的吸声系数和路面 /轮胎系统的振动性能 .实验结果表明 ,和普通沥青路面试件相比 ,SMA路面试样不但在吸声降噪性能方面有一定程度的优势 ,而... 详细信息

为研究碎石沥青玛蹄脂 (SMA)路面的吸声和降振特性 ,分别测试SMA路面和一般沥青路面等多种试件的吸声系数和路面 /轮胎系统的振动性能 .实验结果表明 ,和普通沥青路面试件相比 ,SMA路面试样不但在吸声降噪性能方面有一定程度的优势 ,而且在改善轮胎 /路面系统的振动性能方面也有较显著的优势 .

关键词：交通噪声振动沥青路面