UG参数化设计加工——罗茨鼓风机叶轮曲面

本文阐述了基于UG生成表驱动的三维参数化设计,并对罗茨鼓风机叶轮建立参数化模型、确定设计变量、给模型分配设计变量以及设置和编辑电子表进行了详细的论述,运用UG数控编程,生成加工程序。实践证明,利用此方法可以方便快捷地建立叶轮的三维参数化模型库,以实现叶轮的系列化设计,能大大提高设计效率。     

基于SolidWorks的参数化设计

论述了SolidWorks环境中,通过产品、部件和零件三者之间参数关联,用一种基于装配约束的参数化设计方法实现部件的参数化建模,阐述了这种参数化设计方法中的关键技术,包括产品结构的划分、尺寸分析、关联设计、基于布局草图的装配体设计和方程式的添加;运用部件参数化设计方法构建SolidWorks部件库.采用这种方法,有利于产品的修改和系列化,提高设计效率.     

液压缸部件的参数化设计

在制图软件中,参数化设计方法的研究已成为研究和开发的热点,参数化建模,参数化分析,逐渐成为一种趋势。而基于VBA的SolidWorks二次开发应用更为普遍,简单的开发环境让很多用户使得繁琐、机械的日常办公实现自动化,从而提高办公效率。本文在参阅了大量对参数化设计的文献基础之上,以液压缸的参数化设计为例,进一步探讨了参数化的发展和过程。并根据参数化过程中的API函数来阐述设计方法,使得设计人员能够从繁琐的绘图工作中解脱出来,集中精力选择和优化设计参数,以提高产品质量,缩短产品设计周期。     

圆弧齿轮传动CAD系统设计

随着生产的发展，齿轮传动得到了广泛的使用，而圆弧齿轮传动又具有渐开线齿轮传动无法比拟的特点，使其在齿轮传动中得到了广泛的应用。作为一种新型齿轮传动方式，圆弧齿轮传动具有承栽能力高、使用寿命长、加工简单等优点，所以对它的研究已日益受到人们的重视。圆弧齿轮的齿轮参数对齿轮传动的动态传动性能产生重要的影响，因而利用先进的设计计算方法和计算机技术对圆弧齿轮参数进行研究具有特别重要的意义。     

机械参数化设计方法概述

首先介绍了参数化的发展及技术现状,然后分别介绍了零件参数化和部件参数化的基本方法,零件参数化主要是尺寸驱动和程序驱动两种方法,部件参数化主要是自顶向下和自底向上两种设计方法,并且介绍了各种方法的优缺点,为机械压力机参数化设计打下理论基础。     

基于DCL的参数化绘图通用对话框设计

介绍在AutoCAD环境下采用Visual LISP语言及对话框设计语言(DCL)开发的通用参数化设计对话框函数。对于使用Visual LISP二次开发参数化设计或绘图程序的用户,可直接调用该函数,通过对函数代入参数,即可显示图形与参数直观对应的对话框,并可直观确定选定的参数。用户不必编写繁杂的对话框管理程序,即可写出较专业的参数设计与绘图的Visual LISP程序。     

运用CATIA软件参数化设计烟道闸板门

本文系统研究了CATIA软件的参数化设计功能在中小脱硫项目烟道闸板门设计中的应用,通过建立参数化的闸板门数模,便于尺寸修改,材料统计,缩短了绘图时间,减少了重复性劳动。     

堆垛机的参数化设计

堆垛机是自动化立体仓库的主要设备,属于非标产品,个性化程度较强.但是从堆垛机的功能、结构、零部件的形状进行分析,可以发现同种功能的零部件具有相似的结构与外形轮廓特征,因此可实现通用化、系列化、标准化设计,同时也具备了参数化设计的基本条件.     

机车齿轮参数化设计的研究

齿轮传动是一种广泛应用于机械中的传动形式,对齿轮的设计质量和效率的要求比较高,因此,针对机车齿轮参数化设计进行研究,充分发挥各开发工具的优点,应用于实际。     

高中压调压线圈参数化设计

文章详细介绍了变压器中高中压调压线圈的参数化设计,可为相关工作者的工作实际提供参考.     

基于SolidWorks的圆柱齿轮对CAD/CAE集成化设计

文章首先阐述了基于SolidWorks的圆柱齿轮对三维建模及装配建模的流程,然后叙述了在SolidWorks/COS-MOSWorks集成环境下对圆柱齿轮对装配体进行有限元分析的方法,还重点的对齿廓节点坐标计算、齿轮对装配建模、载荷施加等步骤进行了重点论述。依据文章所述的方法可以快速有效地对不同参数齿轮对进行CAD/CAE集成化设计。     

Unravelling the design process of business models from linear to circular: An empirical investigation

In the last years, circular economy has represented one of the most-debated topics in management research. Although the understanding of this industrial paradigm has significantly improved over the last decade, a number of important research questions still remain unanswered. Among them, the design process of business model through which established firms evolve from being linear to circular deserves further investigation. Existing research still falls short to investigate how companies design the dimensions of value creation, value transfer, and value capture of their business models to launch circular products into the market. By leveraging a multiple case study analysis of four companies in the paper and beverage industries that have launched six circular products, the paper examines the process that these companies have followed to face the transition toward a circular business model. The paper contributes to the research field in the intersection between new product development and circular business models, by showing that the process toward a circular business model occurs along three major phases, that is, idea generation, product development, and commercialization. In each phase, companies implement peculiar managerial practices for launching circular products into the market, which typically address all the dimensions of the business model and follows a recurrent path over time.     

Testing for Seasonal Unit Roots in Monthly Panels of Time Series*

We consider the problem of testing for seasonal unit roots in monthly panel data. To this aim, we generalize the quarterly cross‐sectionally augmented Hylleberg–Engle–Granger–Yoo (CHEGY) test to the monthly case. This parametric test is contrasted with a new non‐parametric test, which is the panel counterpart to the univariate record unit–root seasonal (RURS) test that relies on counting extrema in time series. All methods are applied to an empirical data set on tourism in Austrian provinces. The power properties of the tests are evaluated in simulation experiments that are tuned to the tourism data.     

Optimality and efficiency of circular neighbor balanced designs for correlated observations

The purpose of this paper is to apply the Kunert and Martins (2000b) method for finding optimal designs into the case of dependence. Using this method we study optimality of circular neighbor balanced designs at distances 1 and 2 under the one-dimensional interference model with errors correlated according to a circular autoregressive process. We determine the efficiency of binary designs for specified values of correlation coefficient, for which these designs are not optimal.Research partially supported by the KBN Grant Number 5 P03A 041 21.     

Power of Tests for Unit Roots in the Presence of a Linear Trend*

Dickey and Fuller [Econometrica (1981) Vol. 49, pp. 1057–1072] suggested unit‐root tests for an autoregressive model with a linear trend conditional on an initial observation. TPower of tests for unit roots in the presence of a linear trendightly different model with a random initial value in which nuisance parameters can easily be eliminated by an invariant reduction of the model. We show that invariance arguments can also be used when comparing power within a conditional model. In the context of the conditional model, the Dickey–Fuller test is shown to be more stringent than a number of unit‐root tests motivated by models with random initial value. The power of the Dickey–Fuller test can be improved by making assumptions to the initial value. The practitioner therefore has to trade‐off robustness and power, as assumptions about initial values are hard to test, but can give more power.     

分布式供能与循环经济的能源结构优化

认为分布式供能为城市循环经济发展过程中的能源结构优化提供了新的选择途径,是传统的集中式供能不可或缺的补充和替代,代表着新型绿色供能模式更新换代的发展趋向,成为许多城市发展循环经济的契入点.认为这一新型供能模式的启动与发展需要城市管理决策者的政策引导和社会力量参与的市场化运作.     

Determinants of consumer demand for circular economy products. A case for reuse and remanufacturing for sustainable development

We investigate determinants of consumer demand for circular (reused and remanufactured) products. Based on exploratory choice-based conjoint experiments with a sample of 800 adults in the United Kingdom, we examine two types of premium segment electronic appliances: a mobile phone and a robot vacuum cleaner. We find that consumers prefer partly circulated products over fully or not at all circulated products and that circular products can likely successfully enter the existing market at the retail price of a new product. Interestingly, circular products compete for market share primarily with new products, leaving the market share of second-hand options less affected. The results show a promising path for firms considering a transition to circular business models.     

为三星的设计注入灵魂——记国际著名设计大师高登·布鲁斯及詹姆士·美和

1994年底,17个来自韩国三星的核心干部,走进美国加州的艺术中心设计学院的大门.之前,他们已经跑了14个不同的设计学院,寻寻觅觅,就是为了找到三星总裁李健熙想要的、能够提升三星的灵魂人物,请这个人带领三星由卖廉价品的二流公司,走向超一流的世界品牌.     

离合器试验台设计

文章阐述了惯性式离合器试验台的用途、试验方法以及达到的主要性能指标,分析了原有试验台存在的问题,提出了新的改进设计方案,并对主要改进设计部分进行了分析和论述。