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Shaking-moment balancing of mechanisms with principal vectors and momentum
V. van der WIJK
《机械工程前沿（英文）》 2013年 第8卷 第1期 页码 10-16 doi: 10.1007/s11465-013-0359-2
The design of shaking-moment-balanced linkages still is challenging. Considering moment balance in the very beginning of the design process of mechanisms is important for finding applicable solutions. For this purpose, the method of principal vectors is investigated, showing a compact notation of the angular momentum with respect to the center of mass. The moment balance conditions are derived for three elements in series from which balance solutions are synthesized and illustrated. From the application for moment balancing of a 4R four-bar linkage it is shown that the moment balancing of closed kinematic chains remains challenging.
关键词： shaking-moment balancing principal vector linkage angular momentum
工程饱和介质中漩涡光的调制不稳定性 Review
D.G. Pires, N.M. Litchinitser
《工程（英文）》 2022年 第17卷 第10期 页码 31-43 doi: 10.1016/j.eng.2022.04.022
光束在水下环境、雾、云或生物组织等混浊介质中的传播在科学和技术中有着越来越重要的应用，包括生物成像、水下和自由空间通信技术。虽然这些应用在传统上依赖于常规的线性偏振高斯光束，但光具有许多未被发掘的自由度，如自旋角动量（SAM）和轨道角动量（OAM）。本文提出了具有“旋转”自由度的复杂光束在工程化非线性胶体介质中的非线性光-物质相互作用。利用变分法和摄动法，我们考虑了非圆柱光学涡旋、椭圆光学涡旋和高阶贝塞尔光束在时间上的积分（HOBBIT），来预测这些光束演化的动力学行为和稳定性。这些结果可应用于许多强散射环境下涉及光透射的情况。
关键词： Optical vortex Orbital angular momentum Modulation instability Turbid media
光致旋转技术综述 Review Article
朱琦1,李楠1,苏鹤鸣1,李文强1,胡慧珠1,2
《信息与电子工程前沿（英文）》 2022年 第23卷 第2期 页码 171-185 doi: 10.1631/FITEE.2000338
关键词： 光镊；光致旋转；角动量；微纳转子
RETRACTED ARTICLE: Momentum exchange coefficient for two jet flows mixing in a tee junction
《化学科学与工程前沿（英文）》 2023年 第17卷 第12期 页码 2161-2161 doi: 10.1007/s11705-009-0143-3
On the location of the secondary instantaneous poles in two-degree-of-freedom spherical mechanisms
Soheil ZARKANDI
《机械工程前沿（英文）》 2014年 第9卷 第1期 页码 34-40 doi: 10.1007/s11465-014-0290-1
As the instant centers in planar mechanisms, the instantaneous poles (or instant poles, in brief) can be used for kinematic analysis in spherical mechanisms. One of the mandatory steps in this analysis is the determination of the location of these poles. This paper presents a theorem showing analytically that the locus of an unknown secondary instant pole in two-degree-of-freedom (2-DOF) spherical mechanisms is a great circle (GC). The exact location of the pole on its GC is obtained based on the configuration of the mechanism and velocity ratio of the two inputs. Moreover, using the results of the theorem, a geometrical technique is presented to determine the GC of the pole.
关键词： spherical mechanisms instantaneous poles great circle angular velocity
季灏
《中国工程科学》 2006年 第8卷 第10期 页码 60-65
对验证相对论中动量和动能关系的经典实验重新做了实验研究，发现改变磁场强度后该实验的结果并不符合相对论预言的动量和动能关系。根据实验结果，指出了狭义相对论的运动方程中，物体运动时受力（理论值）不变假定是错误的，并提出物体的受力（理论值）应随着运动速度的增加而减小。通过实验，还发现原来实验中对能量的定标偏高。
Modeling of large-deflection links for compliant mechanisms
Zhonglei FENG, Yueqing YU, Wenjing WANG,
《机械工程前沿（英文）》 2010年 第5卷 第3期 页码 294-301 doi: 10.1007/s11465-010-0019-8
关键词： compliant mechanism pseudo-rigid-body model (PRBM) large-deflection link angular deflection approximation
Solving nonlinear differential equations of Vanderpol, Rayleigh and Duffing by AGM
null
《机械工程前沿（英文）》 2014年 第9卷 第2期 页码 177-190 doi: 10.1007/s11465-014-0288-8
In the present paper, three complicated nonlinear differential equations in the field of vibration, which are Vanderpol, Rayleigh and Duffing equations, have been analyzed and solved completely by Algebraic Method (AGM). Investigating this kind of equations is a very hard task to do and the obtained solution is not accurate and reliable. This issue will be emerged after comparing the achieved solutions by numerical method (Runge-Kutte 4th). Based on the comparisons which have been made between the gained solutions by AGM and numerical method, it is possible to indicate that AGM can be successfully applied for various differential equations particularly for difficult ones. The results reveal that this method is not only very effective and simple, but also reliable, and can be applied for other complicated nonlinear problems.
关键词： Algebraic Method (AGM) Angular Frequency Vanderpol Rayleigh Duffing
吴南星,胡如夫,孙庆鸿
《中国工程科学》 2004年 第6卷 第9期 页码 46-49
数控车床丝杠进给系统刚度对系统的失动量和定位精度影响较大。基于进给系统质量和弹簧力学模型，给出了进给系统轴向刚度和扭转刚度对失动量的影响与定位误差的解析表达式，为进给系统结构设计、降低系统的失动量和提高系统的定位精度提供了理论依据；结合实例进行了应用分析计算，取得了明显效果。
张福学,毛旭,张伟
《中国工程科学》 2006年 第8卷 第8期 页码 23-27
报道了一种利用旋转体自身角速度作为驱动力，通过各向异性刻蚀硅片制作的硅微机械陀螺。介绍了该陀螺敏感结构（硅摆）的设计、制作与封装工艺，用仿真器测试了旋转体的角速率。模拟试验和性能测试表明，该陀螺结构原理正确，可用于敏感旋转体的偏航或俯仰角速度，以及旋转体自身的角速度。
赵慧英,沈兆武
《中国工程科学》 2007年 第9卷 第8期 页码 62-65
从炸药装药的瞬时爆轰产物飞散理论出发，根据动量守恒原理得出药型罩装药形成爆炸成型弹丸的速度计算模型，并根据装药高度与直径之比对弹丸速度的影响修正了计算模型。应用该计算模型计算了大锥角药形罩和球缺药型罩装药形成的爆炸成型弹丸速度，计算结果与实验和数值模拟得到的结果吻合较好，此速度计算模型适合于工程应用。
M.R. AKBARI,D.D. GANJI,A.R. AHMADI,Sayyid H. Hashemi KACHAPI
《机械工程前沿（英文）》 2014年 第9卷 第1期 页码 58-70 doi: 10.1007/s11465-014-0289-7
In the current paper, a simplified model of Tower Cranes has been presented in order to investigate and analyze the nonlinear differential equation governing on the presented system in three different cases by Algebraic Method (AGM). Comparisons have been made between AGM and Numerical Solution, and these results have been indicated that this approach is very efficient and easy so it can be applied for other nonlinear equations. It is citable that there are some valuable advantages in this way of solving differential equations and also the answer of various sets of complicated differential equations can be achieved in this manner which in the other methods, so far, they have not had acceptable solutions. The simplification of the solution procedure in Algebraic Method and its application for solving a wide variety of differential equations not only in Vibrations but also in different fields of study such as fluid mechanics, chemical engineering, etc. make AGM be a powerful and useful role model for researchers in order to solve complicated nonlinear differential equations.
关键词： Algebraic Method (AGM) tower crane oscillating system angular frequency
标题 作者 时间 类型 操作
On the location of the secondary instantaneous poles in two-degree-of-freedom spherical mechanisms
Soheil ZARKANDI
期刊论文
Modeling of large-deflection links for compliant mechanisms
Zhonglei FENG, Yueqing YU, Wenjing WANG,
期刊论文
塔西买提•玉苏甫：轨道角动量可控中红外涡旋光参量振荡器（2019年10月13日）
塔西买提•玉苏甫(高级职称)
2021年01月20日
会议视频
Analyzing the nonlinear vibrational wave differential equation for the simplified model of Tower Cranes by Algebraic Method
M.R. AKBARI,D.D. GANJI,A.R. AHMADI,Sayyid H. Hashemi KACHAPI
期刊论文
陈畴镛：以新基建增强数字经济新动能（2020年3月1日）
2022年04月18日
会议视频
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