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Search Results: 1 - 10 of 34241 matches for " 邓扬晨 "
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几何优化在小型飞机起落架结构设计中的应用

力学与实践 , 2008, DOI: 10.6052/1000-0992-2006-481
Abstract: 为开展小型飞机起落架结构的轻量化设计工作,本文首次将有关的强度规范引入其中,并以杆件的强度与失稳载荷作为限制条件,采用位置优化与尺寸优化进行起落架结构的最小重量设计.由算例可知仿真的优化计算与实验结果相符合;理论分析与航模载重参赛飞行情况也表明此法不仅可行而且有效,可以用于类似的小型或者超轻型飞机的起落架结构设计.
累积线性法在细长柔性悬臂梁结构分析中的应用

力学与实践 , 2013, DOI: 10.6052/1000-0879-12-257
Abstract: 为了研究几何大位移悬臂梁的结构响应,在充分利用线性有限元原理与流程的基础上,本文提出
飞行器板筋结构优化设计的试验验证及分析
,孙聪
力学与实践 , 2012, DOI: 10.6052/1000-0879-11-380
Abstract: 针对国内在结构拓扑优化上理论研究多、实验验证少的现状,采用
APPLICATION OF SHAPE OPTIMIZATION IN LANDING-GEAR STRUCTURAL DESIGN OF SMALL AIRCRAFT
几何优化在小型飞机起落架结构设计中的应用

DENG Yangchen,

力学与实践 , 2008,
Abstract: In the light weight design of truss-like landing-gear structure, the related specification on strength is considered. The bars' strength and critical loads are used as constraints and the minimum structural weight design is achieved by shape and size optimization. The data obtained from an example agree with the results of static force test. Theoretical analysis and the flight of model planes carrying load show that the approach is not only feasible but also effective. It can be used to design the landing-gear structure of a small or super light-weighted vehicle. %Finally, three conclusions have been drawn from this paper.
基于敏度阈值拓扑优化方法在飞机加强框设计中的应用
,李学军,朱继宏,陈华
力学与实践 , 2005, DOI: 10.6052/1000-0992-2004-296
Abstract: 为了能够有效地降低飞机结构承力件的重量,针对飞机骨架,以加强框的概念设计为研究内容,通过对``敏度阈值''概念的分析,指出其不足,提出了``改进的敏度阈值''概念,并与``约束补偿''策略结合而形成新的拓扑优化算法,用于加强框的材料布局设计.多个算例中的拓扑优化结果均显示其结构型式十分新颖,值得深入地探讨.
基于景观生态学理念的城市形态结构表达
The Expression of Urban Form and Structure Based on Landscape Ecology Concept
 [PDF]

金平,
International Journal of Ecology (IJE) , 2015, DOI: 10.12677/IJE.2015.43011
Abstract:
城市形态和结构是城市可持续发展的基本构架,对于营造生态宜居城市具有重要意义。风景园林建设是城市中植物景观配置、生物多样性保护及城市文化风貌的集中体现。本文以城市形态和结构为研究对象,在景观生态学理论的指导下,结合东西方城市发展历程和当前国际新城建设的思想,通过对廊道、基质、斑块和城市边缘区的系统分析,将其渗透于人类活动、城市交通、地块、地形地貌、土地利用及活动场所分布等城市形态层次中。基于景观生态学的城市景观形态构成分析,本文尝试从新的视角探讨景观生态学理念对城市形态和结构的影响,以期为城市的可持续发展提供有益的借鉴。
Urban form and structure is the basic framework of the urban sustainable development and is of great significance to build ecological livable city. Construction of landscape architecture is the concentrated reflection of landscape plant configuration, biodiversity conservation and urban cultural landscape in the city. Under the guidance of the theory of landscape ecology, this paper studies the urban form and structure. Corridor, matrix, plaques and urban fringe areas were systematically analyzed. We permeate them into the urban form levels such as human activities, the urban traffic, plot, topography, land utilization and activity place distribution. Based on the urban landscape form analysis of the landscape ecology, this paper tries to explore the impact of landscape ecology on the urban form and structure from a new perspective in order to provide some useful references for the sustainable development of the city.
公共交通优先发展战略实施监管体系研究
Supervision System for Implementation of Public Transport Priority Development Strategy
 [PDF]

, 荣建,, 赵琳
Open Journal of Transportation Technologies (OJTT) , 2013, DOI: 10.12677/OJTT.2013.22018
Abstract:
公共交通优先发展战略的实施是一项综合性、系统性工作。研究总结分析我国三类典型城市公交行业发展案例,将我国当前城市公交行业发展划分为政府垄断经营、市场化运营、公交优先发展三个层次,并指出完善的市场化运营机制、有效的监管体系是公交优先发展的必要措施。然后,对我国城市公共交通优先发展所需因素进行总结,在此基础上提出了公共交通优先发展战略实施条件下公交系统监管体系构建思路及内容。
It is a comprehensive and systematic work for implementation of public transport priority development strategy. This research summarized and analyzed three kinds of typical cities of bus industry development case, divided the development of urban bus industry into three levels: government monopoly management, market operation and public transport priority development, and pointed out that it was necessary to construct the perfect market operating mechanism and effective supervision system. Then, we summarized the influence factors of public transport priority development. Based on all of these, we proposed supervision system for implementation of public transport priority development strategy.

非线性随机系统的概率密度追踪控制
,
自动化学报 , 2012, DOI: 10.3724/SP.J.1004.2012.00197
Abstract: ?针对目前非线性随机系统控制方法的设计复杂、计算成本高以及缺乏稳定性或收敛性证明等缺点,提出了一种全新的基于等效非线性系统法求近似稳态解的思想设计的非线性随机系统的反馈控制,使受控系统输出的稳态概率密度函数逼近事先给定的目标概率密度函数.利用Lyapunov函数法证明了受控系统的收敛性.数学仿真结果证明了这种方法的可行性和正确性.
一种快速多用途TD-TTL弛豫振荡器

半导体学报 , 1981,
Abstract: 本文提出TD-TTL组合弛豫振荡电路.由于综合利用了两种快速器件(隧道二极管与高速晶体管-晶体管逻辑)的特点,又加上特有的反馈网络,因而呈现出一系列优越的电学性能.诸如波形好、高速、宽带频率变换、便于程控以及灵活多变的电路功能等. 本文研究了TD与TTL接口电平的匹配关系,分析计算了电路的振荡周期,列出了性能特点,给出了应用实例,指出了应用前景.
关于Powell方法理论基础的探讨

科学通报 , 1979,
Abstract: Powell直接方法是求解无约束最优化问题的一个重要方法。它是从研究正定二次目标函数■(其中G是n×n阶正定对称矩阵,b是常向量,c是常数)导出的。Powell先后在文献1]、3]中两次证明了下列定理:n个非零向量D:d_1,…,d_n的函数
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