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A new type of quadratic acceleration method
Changqing LI, Menglin LOU,
《结构与土木工程前沿(英文)》 2010年 第4卷 第3期 页码 302-310 doi: 10.1007/s11709-010-0026-1
关键词: polynomial acceleration method convergence stability square acceleration method
Position-varying surface roughness prediction method considering compensated acceleration in milling
《机械工程前沿(英文)》 2021年 第16卷 第4期 页码 855-867 doi: 10.1007/s11465-021-0649-z
关键词: surface roughness prediction compensated acceleration milling thin-walled workpiece
基于惯性能时空最优分布的高加速轻载机构精密定位方法 Article
陈新,白有盾,杨志军,高健,陈贡发
《工程(英文)》 2015年 第1卷 第3期 页码 391-398 doi: 10.15302/J-ENG-2015063
高速运动精密定位是微电子封装设备中高加速轻载执行机构的基本运动需求。本文推导了高加速机构瞬态非线性动力学响应方程,揭示了刚度、频率、阻尼 (与材料空间布局相关) 和驱动频率 (与运动规划相关) 是主要影响因素。据此,在满足高加速机构精密定位的条件下,笔者提出了一种基于最优非线性动力学响应的结构优化和速度规划新方法。在结构优化中,首先分析了目前流行的基于等效静态载荷的柔性多体动力学优化方法未充分考虑惯性载荷的不足,然后提出了基于等效模态的柔性多体动力学最优动态响应优化新方法;在速度规划上,针对传统的几何光滑方法不能反映系统动态特性的缺陷,提出了基于变边界条件非线性动力学响应优化的速度规划新方法。将所提方法应用到高速固晶焊头的优化设计中,通过结构优化,降低振幅超过20%,再经非对称变加速规划,缩短定位时间超过40%。本文提出的方法为微电子封装类装备等高加速轻载机构精密定位的实现提供了有效的理论支撑和解决途径。
Mahdi FAKOOR, Hadi PARVIZ
《结构与土木工程前沿(英文)》 2020年 第14卷 第6期 页码 1359-1371 doi: 10.1007/s11709-020-0658-8
关键词: composite plate spatially varying stochastic properties Galerkin method polynomial chaos approach semi-analytical approach
赵颜利,平萍,刘凤玉
《中国工程科学》 2008年 第10卷 第7期 页码 147-152
给出了k( k ≥ 3) 阶指数多项式的均匀样条模型。该类模型具有很多与B 样条模型相同的性质,并 且增加了一个可调节的形状参数。由该模型构造的曲线,通过改变形状参数的取值,可以调整曲线接近其控 制多边形的程度。应用于CAD/CAM领域,可作为几何造型的一种新的有效模型。
Zhigen WU, Guohua LIU, Zihua ZHANG
《结构与土木工程前沿(英文)》 2011年 第5卷 第1期 页码 112-120 doi: 10.1007/s11709-010-0069-3
关键词: damage assessment decay ratio of acceleration signals (DRAS) wavelet transform (WT) modal analysis reinforced concrete beam beat phenomenon
YAO Chun-de, ZHOU Hong-xiu
《机械工程前沿(英文)》 2006年 第1卷 第4期 页码 409-412 doi: 10.1007/s11465-006-0048-5
关键词: acceleration velocity distribution high-speed brushless turbocharger electric supercharger
《结构与土木工程前沿(英文)》 页码 179-190 doi: 10.1007/s11709-022-0888-z
关键词: uncertain composite plate stochastic assume mode method Karhunen−Loève theorem polynomial chaos approach plate buckling irregularity in buckling mode shapes
宫凤强,李夕兵,邓建
《中国工程科学》 2006年 第8卷 第5期 页码 69-73
提出了工程结构可靠性分析的高阶矩方法。主要是基于数值逼近原理,以切比雪夫正交函数族{Tk(x)}做基,利用功能函数的高阶矩信息,通过计算功能函数概率密度函数的逼近表达式,然后根据工程结构可靠性的一般表达式来计算结构的失效概率,进行可靠性分析。通过经典分布函数的数值检验和结构构件失效概率的计算结果比较,表明了该方法在理论上的正确性和工程中的实用性。
Jiangbo Jin, Yun Zhu, Jicheng Jang, Shuxiao Wang, Jia Xing, Pen-Chi Chiang, Shaojia Fan, Shicheng Long
《环境科学与工程前沿(英文)》 2021年 第15卷 第2期 doi: 10.1007/s11783-020-1323-0
关键词: Response surface model Hill-climbing algorithm Ozone pollution Precursor emissions Control strategy
Osvaldo PENISI,José BOCCA,Horacio AGUILAR,Pedro BOCCA
《机械工程前沿(英文)》 2015年 第10卷 第3期 页码 221-232 doi: 10.1007/s11465-015-0347-9
In the mechanized harvest of vines, grape berries are detached through the vibration to the structure supporting the clusters. According to the kind of guide selected, the clusters require one or two vibration directions in the structure. For guiding in parral structures, vibration is necessary in two directions or planes: One perpendicular to the other. The guide branches producing the clusters develop in these planes, and the guiding is called H-guiding. Mechanism theory indicates that a mechanism has as many degrees of freedom as its actuators, and an actuator is needed to achieve a certain vibration. Having the smallest number of possible actuators is beneficial in reducing moving parts and achieving more compact and easily controllable mecha-nisms. In this case, a single degree-of-freedom mechanism is proposed. It is capable of generating vibrations on two planes: One perpendicular to the other. This mechanism is the sum of two link mechanisms on perpendicular planes with a common outlet located at the output rod of the mechanism where the actuator is found. As the distance between the soil and the elements containing the clusters is not constant, a system has been designed to measure the accelerations at the bars and the rocker to validate the acceleration values that detach the grape berries in a prototype in a lab experiment, to ensure that the acceleration needed for pulling the grape berries are produced at any contact point of the bar.
基于对称多项式辅助的中国余数定理的脉冲多普勒雷达多目标距离估计算法 Research Articles
曹成虎1,赵永波1,2
《信息与电子工程前沿(英文)》 2022年 第23卷 第2期 页码 304-316 doi: 10.1631/FITEE.2000418
Multiobjective trajectory optimization of intelligent electro-hydraulic shovel
《机械工程前沿(英文)》 2022年 第17卷 第4期 doi: 10.1007/s11465-022-0706-2
关键词: trajectory planning electro-hydraulic shovel cubic polynomial S-curve multiobjective optimization entropy weight technique
标题 作者 时间 类型 操作
Position-varying surface roughness prediction method considering compensated acceleration in milling
期刊论文
Uncertainty propagation in dynamics of composite plates: A semi-analytical non-sampling-based approach
Mahdi FAKOOR, Hadi PARVIZ
期刊论文
Experimental study of structural damage identification based on modal parameters and decay ratio of acceleration
Zhigen WU, Guohua LIU, Zihua ZHANG
期刊论文
Design and characteristics of electric supercharger for diesel engine acceleration by additional rapid
YAO Chun-de, ZHOU Hong-xiu
期刊论文
Probabilistic stability of uncertain composite plates and stochastic irregularity in their buckling mode shapes: A semi-analytical non-intrusive approach
期刊论文
Enhancement of the polynomial functions response surface model for real-time analyzing ozone sensitivity
Jiangbo Jin, Yun Zhu, Jicheng Jang, Shuxiao Wang, Jia Xing, Pen-Chi Chiang, Shaojia Fan, Shicheng Long
期刊论文
One DOF mechanism for the mechanical harvest of vines in an arbor structure and the validation of the acceleration
Osvaldo PENISI,José BOCCA,Horacio AGUILAR,Pedro BOCCA
期刊论文