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Multi-harmonic forced vibration and resonance of simple beams to moving vehicles
《结构与土木工程前沿(英文)》 页码 981-993 doi: 10.1007/s11709-023-0979-5
关键词: forced vibration linear Euler beam moving load harmonic structure frequency modulation end restraints
冯兆祥,陈亮,缪长青
《中国工程科学》 2012年 第14卷 第5期 页码 80-84
针对泰州大桥开展结构动力特性计算,分析了不同移动速度以及不同移动荷载大小对于三塔两跨悬索桥结构动力响应的影响。结果表明,三塔两跨悬索桥的一阶竖弯振动基频约为0.08 Hz,远低于载重汽车的固有频率,不会形成共振条件。简单的移动荷载作用下三塔两跨连续支承悬索桥的内力、位移响应与同等静力荷载作用效果比较接近。移动荷载的质量越大、速度越大,结构的内力、位移响应就越大,并与车重呈近似正比例关系。结构内力、位移的荷载放大系数不随移动荷载质量的大小而改变。
Time-domain and frequency-domain approaches to identification of bridge flutter derivatives
Zhengqing CHEN
《结构与土木工程前沿(英文)》 2009年 第3卷 第2期 页码 173-179 doi: 10.1007/s11709-009-0034-1
关键词: long-span bridges wind-induced vibration flutter derivatives forced vibration test time-domain method frequency-domain method
Study on forced air convection cooling for electronic assemblies
LI Bin, TAO Wenquan, HE Yaling
《能源前沿(英文)》 2008年 第2卷 第2期 页码 158-163 doi: 10.1007/s11708-008-0009-2
关键词: concept slotted air-cooling Preliminary computation generation
YANG Xiao, LIU Xuemei
《机械工程前沿(英文)》 2007年 第2卷 第1期 页码 57-61 doi: 10.1007/s11465-007-0009-7
关键词: semi-infinite saturated direction interaction skeleton thermal equilibrium
Soybean drying characteristics in microwave rotary dryer with forced convection
Ruifang WANG, Zhanyong LI, Yanhua LI, Jingsheng YE
《化学科学与工程前沿(英文)》 2009年 第3卷 第3期 页码 289-292 doi: 10.1007/s11705-009-0022-y
Thiago ANTONINI ALVES,Paulo H. D. SANTOS,Murilo A. BARBUR
《机械工程前沿(英文)》 2015年 第10卷 第3期 页码 263-276 doi: 10.1007/s11465-015-0345-y
In this research, the temperatures of three-dimensional (3D) protruding heaters mounted on a conductive substrate in a horizontal rectangular channel with laminar airflow are related to the independent power dissipation in each heater by using a matrix G+ with invariant coefficients, which are dimensionless. These coefficients are defined in this study as the conjugate influence coefficients (g+) caused by the forced convection-conduction nature of the heaters’ cooling process. The temperature increase of each heater in the channel is quantified to clearly identify the contributions attributed to the self-heating and power dissipation in the other heaters (both upstream and downstream). The conjugate coefficients are invariant with the heat generation rate in the array of heaters when assuming a defined geometry, invariable fluid and flow rate, and constant substrate and heater conductivities. The results are numerically obtained by considering three 3D protruding heaters on a two-dimensional (2D) array by ANSYS/FluentTM 15.0 software. The conservation equations are solved by a coupled procedure within a single calculation domain comprising of solid and fluid regions and by considering a steady state laminar airflow with constant properties. Some examples are shown, indicating the effects of substrate thermal conductivity and Reynolds number on conjugate influence coefficients.
关键词: channel flow conjugate forced convection-conduction cooling conjugate influence coefficients discrete heating invariant descriptor thermal management
蔡波,李辉亮,廖光煊
《中国工程科学》 2005年 第7卷 第8期 页码 80-83
地铁火灾比地面火灾具有更大的危险性。通过对地铁火灾的模拟可以重现火灾过程,研究火灾现象,分析火灾原因。通过FDS模拟,对比大邱市地铁火灾在有无强制通风烟控系统条件下,火灾现场的温度场和烟尘分布,研究讨论其对控制地铁火灾的重要作用。
《机械工程前沿(英文)》 2023年 第18卷 第1期 doi: 10.1007/s11465-022-0730-2
关键词: ultrasonic vibration-assisted grinding perforated ultrasonic vibration platform vibration characteristics apparent elasticity method grinding force surface integrity
Recent development of vibration utilization engineering
WEN Bangchun
《机械工程前沿(英文)》 2008年 第3卷 第1期 页码 1-9 doi: 10.1007/s11465-008-0017-2
关键词: utilization engineering non-linear vibration vibration utillization utillization engineering
Guilian YI, Yunkang SUI, Jiazheng DU
《机械工程前沿(英文)》 2011年 第6卷 第2期 页码 229-234 doi: 10.1007/s11465-011-0128-z
To reduce vibration and noise, a damping layer and constraint layer are usually pasted on the inner surface of a gearbox thin shell, and their thicknesses are the main parameters in the vibration and noise reduction design. The normal acceleration of the point on the gearbox surface is the main index that can reflect the vibration and noise of that point, and the normal accelerations of different points can reflect the degree of the vibration and noise of the whole structure. The K-S function is adopted to process many points’ normal accelerations as the comprehensive index of the vibration characteristics of the whole structure, and the vibration acceleration level is adopted to measure the degree of the vibration and noise. Secondary development of the Abaqus preprocess and postprocess on the basis of the Python scripting programming automatically modifies the model parameters, submits the job, and restarts the analysis totally, which avoids the tedious work of returning to the Abaqus/CAE for modifying and resubmitting and improves the speed of the preprocess and postprocess and the computational efficiency.
关键词: Abaqus secondary development Python language vibration and noise reduction K-S function vibration acceleration level
Similitude design for the vibration problems of plates and shells: A review
Yunpeng ZHU, You WANG, Zhong LUO, Qingkai HAN, Deyou WANG
《机械工程前沿(英文)》 2017年 第12卷 第2期 页码 253-264 doi: 10.1007/s11465-017-0418-1
Similitude design plays a vital role in the analysis of vibration and shock problems encountered in large engineering equipment. Similitude design, including dimensional analysis and governing equation method, is founded on the dynamic similitude theory. This study reviews the application of similitude design methods in engineering practice and summarizes the major achievements of the dynamic similitude theory in structural vibration and shock problems in different fields, including marine structures, civil engineering structures, and large power equipment. This study also reviews the dynamic similitude design methods for thin-walled and composite material plates and shells, including the most recent work published by the authors. Structure sensitivity analysis is used to evaluate the scaling factors to attain accurate distorted scaling laws. Finally, this study discusses the existing problems and the potential of the dynamic similitude theory for the analysis of vibration and shock problems of structures.
Analytical and numerical investigation into the longitudinal vibration of uniform nanotubes
null
《机械工程前沿(英文)》 2014年 第9卷 第2期 页码 142-149 doi: 10.1007/s11465-014-0292-z
In recent years, prediction of the behaviors of micro and nanostructures is going to be a matter of increasing concern considering their developments and uses in various engineering fields. Since carbon nanotubes show the specific properties such as strength and special electrical behaviors, they have become the main subject in nanotechnology researches. On the grounds that the classical continuum theory cannot accurately predict the mechanical behavior of nanostructures, nonlocal elasticity theory is used to model the nanoscaled systems. In this paper, a nonlocal model for nanorods is developed, and it is used to model the carbon nanotubes with the aim of the investigating into their longitudinal vibration. Following the derivation of governing equation of nanorods and estimation of nondimensional frequencies, the effect of nonlocal parameter and the length of the nanotube on the obtained frequencies are studied. Furthermore, differential quadrature method, as a numerical solution technique, is used to study the effect of these parameters on estimated frequencies for both classical and nonlocal theories.
关键词: continuum theory differential quadrature method nanorod longitudinal vibration
Design of ultrasonic elliptical vibration cutting system for tungsten heavy alloy
《机械工程前沿(英文)》 2022年 第17卷 第4期 doi: 10.1007/s11465-022-0715-1
关键词: tungsten heavy alloy ultrasonic elliptical vibration cutting Timoshenko’s theory resonant mode of bending finite element method
Experimental study of heat transfer coefficient with rectangular baffle fin of solar air heater
Foued CHABANE,Nesrine HATRAF,Noureddine MOUMMI
《能源前沿(英文)》 2014年 第8卷 第2期 页码 160-172 doi: 10.1007/s11708-014-0321-y
关键词: Nusselt number flow rate heat transfer heat transfer coefficient thermal efficiency forced convection
标题 作者 时间 类型 操作
Time-domain and frequency-domain approaches to identification of bridge flutter derivatives
Zhengqing CHEN
期刊论文
Study on forced air convection cooling for electronic assemblies
LI Bin, TAO Wenquan, HE Yaling
期刊论文
Thermally developing forced convection and the corresponding thermal stresses in a porous plate channel
YANG Xiao, LIU Xuemei
期刊论文
Soybean drying characteristics in microwave rotary dryer with forced convection
Ruifang WANG, Zhanyong LI, Yanhua LI, Jingsheng YE
期刊论文
An invariant descriptor for conjugate forced convection-conduction cooling of 3D protruding heaters in
Thiago ANTONINI ALVES,Paulo H. D. SANTOS,Murilo A. BARBUR
期刊论文
Vibration characteristics and machining performance of a novel perforated ultrasonic vibration platform
期刊论文
Application of python-based Abaqus preprocess and postprocess technique in analysis of gearbox vibration
Guilian YI, Yunkang SUI, Jiazheng DU
期刊论文
Similitude design for the vibration problems of plates and shells: A review
Yunpeng ZHU, You WANG, Zhong LUO, Qingkai HAN, Deyou WANG
期刊论文
Analytical and numerical investigation into the longitudinal vibration of uniform nanotubes
null
期刊论文