高层住宅建筑BIM半自动设计应用研究

随着房地产行业竞争加剧,项目开发效率提升是房地产企业生存关键,其中设计效率是开发率提升的最关键因素。而住宅作为房地产的核心产品,其设计相对简单,标准化程度也越来越高,设计师工作中存在大量简单重复的部分。而随着计算机技术的发展,越来越多的工作逐渐被计算机很好的替代。本研究针对住宅设计工作中容易被计算机替代的部分进行研究,借鉴国外生成式设计的理念和方法,结合国内住宅设计的特点,重点解决生成式设计中流程设计、规则库构建的问题,形成一套综合的方法,让设计师与计算机更高效的交互协作,实现半自动化住宅建筑设计,实现住宅设计的提效,节约人力成本。从而驱动住宅地产项目整体开发效率的提升。BIM技术是近年来地产行业开发提效的主流,也被认为理论上可以极大提高建筑设计效率的工具,BIM技术强大的建筑三维信息承载能力,可以全方面的支持本研究的理念。因此本研究结合行业需求,结合BIM及生成式设计的技术,形成一套“高层住宅建筑BIM半自动设计应用研究”。

凸轮传动半自动化播种机的方案设计与分析

我国有500家左右的企业生产播种机,以谷物条播机为主,并且与畜力播种机和小型拖拉机一起使用的播种机,占主导地位。与畜力播种机和小型拖拉机一起使用的播种机占全国产量的90%多,但与之形成鲜明对比的是,国家有10家企业生产与中型拖拉机一起使用的播种机。本文通过设计凸轮曲线,实现种子,水箱的开关时间,严格控制播种颗粒数,实现有机肥的均匀定量的施加,适合于劳动密集型,家庭劳动力充足,耕地面积不是很多且土地干燥的地方,价格便宜,操作方便。

三维参数化设计在港口水运行业中的应用

近十年来,BIM技术在建筑、市政、交通等行业的应用不断深入,三维可视化设计取代二维设计的趋势愈加明显。但是,三维设计在水运、水利行业的应用并不均衡,且部分专业缺少专业的三维设计软件,存在设计效率低、应用难度大的问题。本文着重介绍如何利用三维参数化模板技术,辅助内河港口项目中水工金属结构专业设计人员实现快速三维设计与出图、并辅助有限元计算前处理。通过使用效果来看,三维参数化模板对类似结构的设计效率、设计精度的提高具有十分显著的效果。

An efficient spatio-temporal data structure for multi version management of engineering drawings

In the engineering database system, multiple versions of a design including engineering drawings should be managed efficiently. The paper proposes an efficient spatial data structure, that is an expansion of the R tree and HR tree, for version management of engineering drawings. A novel mechanism to manage the difference between drawings is introduced to the HR tree to eliminate redundant duplications and to reduce the amount of storage required for the data structure. Data management mechanism and structural properties of our data structure called the MVR + tree are described.

A class of quasi Bézier curves based on hyperbolic polynomials

This paper presents a basis for the space of hyperbolic polynomials Γm=span{1, sht, cht, sh2t, ch2t, …, shmt, chmt} on the interval [0,α] from an extended Tchebyshev system, which is analogous to the Bernstein basis for the space of polynomial used as a kind of well-known tool for free-form curves and surfaces in Computer Aided Geometry Design. Then from this basis, we construct quasi Bézier curves and discuss some of their properties. At last, we give an example and extend the range of the pa- rameter variable t to arbitrary close interval [r, s] (r<s).

Wind Generator Stabilization with Doubly-Fed Asynchronous Machine

This paper investigates the function of doubly-fed asynchronous machine(DASM)with emphasis placed on its ability to the stabilization of the power system including wind generators.P(active power)and Q(reactive power)compensation from DASM can be regulated independently through secondary-excitation controlling.Simulation results by power system computer aided design(PSCAD)show that DASM can restore the wind-generator system to a normal operating condition rapidly even following severe transmission-line failures.Comparison studies have also been performed between wind turbine pitch control and proposed method.

电动汽车

[ 篇名 ] Computer aided design of an axial-field PM brushless DC motor for an electric vehicle，[ 篇名 ] Concept of the “KAZ”, the Start of a New Generation in Car Design，[ 篇名 ] Conceptual Design of Hybrid Electric Vehicle for Urban Use in China，[ 篇名 ] Consumer Education - An Essential Element in the Acceptance of the Electric Vehicle，[ 篇名 ] Control and Management Strategies for the Delphi High Power Lithium Battery，[ 篇名 ] Control of a Continuously Operated Pole-Changing Induction Machine，[ 篇名 ] Control of compact hybrid drive consisting of PM motor and planetary transmission CVT，[ 篇名 ] Control of independent rear wheel drives for electric and hybrid vehicles using one neuro-fuzzy controller，[ 篇名 ] Controller-induced parasitic torque ripples in a PM synchronous motor，[ 篇名 ] Coordination of Charging Stations for Electric Vehicles，[ 篇名 ] Coupled Electrochemical and Thermal Analysis of Electric-Vehicle Battery Modules，[ 篇名 ] Current Activities of Standardisation in Japan，[ 篇名 ] Current Status Report on U.S. Department of Energy Electric and Hybrid Electric Vehicle Energy Storage R&D Programs，[ 篇名 ] Current-mode control for sensorless BDCM drive with intelligent commutation tuning，[ 篇名 ] DaimlerChrysler EPIC Minivan Powered by Lithium-Ion Batteries，[ 篇名 ] Design and analysis of a new multiphase polygonal-winding permanent-magnet brushless DC machine，[ 篇名 ] Design and development of the 2001 Michigan Tech FutureTruck, a power-split hybrid electric vehicle，[ 篇名 ] Design and development of the 2002 Comell University hybrid electric vehicle，[ 篇名 ] Design and development of the 2002 Michigan Tech FutureTruck, a parallel hybrid electric vehicle，[ 篇名 ] Design and development of the 2002 Penn State University parallel hybrid electric explorer, the Wattmuncher。

Computation of lower derivatives of rational triangular Bézier surfaces and their bounds estimation

By introducing the homogenous coordinates, degree elevation formulas and combinatorial identities, also by using multiplication of Bernstein polynomials and identity transformation on equations, this paper presents some explicit formulas of the first and second derivatives of rational triangular Bézier surface with respect to each variable (including the mixed derivative) and derives some estimations of bound both on the direction and magnitude of the corresponding derivatives. All the results above have value not only in surface theory but also in practice.