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根据涡旋压缩机的结构特点,建立了涡旋压缩机的虚拟样机,通过对虚拟样机进行运动仿真,介绍了虚拟技术在涡旋压缩机设计中的运用. 相似文献
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定节距涡旋压缩机作为气体循环的动力系统,在流体机械、空调通风、石油化工领域已经广泛得到使用。与其他种类压缩机相比,涡旋压缩机具有气体脉动小、效率高、可靠性高(转速可达到13000r/min)、结构紧凑、噪声小、零部件少等诸多优点。近几年,对变节距涡旋压缩机的研究已成为压缩机行业的前沿热点。本项目就是迎合了压缩机的发展方向,通过改变基圆半径,以达到改变节距的目的,利用分段曲线等微分几何理论,建立动、静涡旋盘涡旋壁的型线方程,完成对定节距涡旋压缩机的改进。然而对变节距涡旋压缩机和定节距涡旋压缩机的比较现仅限于概念上,还未进行量化对比。本文将对两者的差距实现量化,探究变节距涡旋压缩机相比定节距涡旋压缩机在各方面的优点。 相似文献
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众所周知,涡旋压缩机是目前世界上最先进的压缩机之一,以其诸多的优点,正逐渐成为制冷系统和空气调节器的首选压缩机机种。但涡旋压缩机的制造难点在于涡旋盘的超精密加工,如何加工出μ级涡旋盘是摆在压缩机制造业的一道难题。为此,本文结合作者对国外涡旋盘精加工专用机床的了解,进一步介绍μ级涡旋盘是如何通过误差补偿加工出来的。 涡旋盘精加工原理 从理论上讲,阿基米德螺线、半圆渐开线、正 相似文献
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空调用涡旋压缩机的高效化主要从以下几个方面进行:泄漏损失的减小,摩擦损失的降低,油路和排气通路的优化,电机效率的提升以及相关技术的改进和创新。 相似文献
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在产品设计和开发过程中,零部件的标准化有利于缩短产品开发周期,加快产品设计过程,减少重复性的劳动。本文针对UG软件,利用Excel可以快速、便捷的建立结构形状相同仅尺寸不同零件的三维模型库,是一种非常实用的三维参数化设计方法。 相似文献
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Researchers and brand managers have limited understanding of the effects social media communication has on how consumers perceive brands. We investigated 504 Facebook users in order to observe the impact of firm-created and user-generated (UG) social media communication on brand equity (BE), brand attitude (BA) and purchase intention (PI) by using a standardized online survey throughout Poland. To test the conceptual model, we analyzed 60 brands across three different industries: non-alcoholic beverages, clothing and mobile network operators. When analyzing the data, we applied the structural equation modeling technique to both investigate the interplay of firm-created and user-generated social media communication and examine industry-specific differences. The results of the empirical studies showed that user-generated social media communication had a positive influence on both brand equity and brand attitude, whereas firm-created social media communication affected only brand attitude. Both brand equity and brand attitude were shown to have a positive influence on purchase intention. In addition, we assessed measurement invariance using a multi-group structural modeling equation. The findings revealed that the proposed measurement model was invariant across the researched industries. However, structural path differences were detected across the models. 相似文献
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本文着重介绍了压缩机防喘振控制的原理,及其在淮南化工总厂180kt/a合成氨工程合成气压缩机组防喘控制系统设计中的应用。 相似文献
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本文介绍了一种在时域上用FIR滤波器实现高速数字脉冲压缩器的方案设计,并给出了该数字脉冲压缩器对小时带积截断高斯窗非线性调频(NLFM)信号进行修正型匹配滤波处理的性能实测结果。 相似文献
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通过电子设备多学科主模型相关技术研究,归纳了电子设备多学科主模型概念及其
特点,明确了综合化电子设备多学科综合优化模型组成,提出了两种基于多学科主模型技术
的综合优化模型建立技术及其实现途径,为多学科优化设计技术研究和电子设备多学科优化
设计平台开发奠定了技术基础。 相似文献
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航天机轨道器S波段网通信跟踪系统,提供跟踪测量和双向通信信息。该系统采用增量调制和扩频技术、加密措施,以增强抗干扰和保密性能;采用余度备份,以提高可靠性。 相似文献
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《Journal of Retailing and Consumer Services》2014,21(2):211-219
Effects of atmospheric cues are usually not compared across offline and online contexts as well as across age groups. This study proposes a model that examines the effect of the atmospheric cues graphics design and information design on positive emotions and loyalty intentions. The model is compared across offline and online stores and regards the consumers' age as moderator. A field study was conducted, which collected data from 363 customers. Hypotheses are tested using structural equation modeling. Results for the offline context reveal that graphics design foster positive emotions and loyalty. Information design predicts loyalty. Results for the online context reveal that information design is salient over graphics design. Information design fosters positive emotions and loyalty, while graphics design does not. Further, we found that in the offline context positive emotions predict loyalty among younger customers but not among older ones. In the online context the effect of graphics design on loyalty is stronger and, thus, significant for younger customers than compared to older ones. 相似文献
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本文阐述了造型设计的基本概念 ,分析了我国军用电子设备造型设计的现状和差距 ,讨论了美学法则在军用电子设备造型设计中的具体运用以及军用电子设备具体的造型设计方法 ,给出了造型设计实例 相似文献
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介绍了一种通过PLC及变频技术实现的空气压缩机组运行控制系统,在满足生产对气源供给及时性及安全性要求的同时,实现空气压缩机组的经济运行,有效降低机组的能耗。同时给出了控制系统的软、硬件设计。 相似文献
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Anne T. Coughlan S. Chan Choi Wujin Chu Charles A. Ingene Sridhar Moorthy V. Padmanabhan Jagmohan S. Raju David A. Soberman Richard Staelin Z. John Zhang 《Marketing Letters》2010,21(3):317-333
This paper shows how analytic modeling research in the Marketing field is focused on answering questions of “How?” and “Why?” It describes the disciplines involved in analytic modeling; examines how the key criteria of parsimony and robustness help to define a good model; and discusses other goodness criteria, including appropriate use of analytic techniques, applicability of the model to institutionally rich, real-world problems, non-obvious results, generalizability, and ability to provide insight where other research techniques do not work. The paper defines and discusses key concepts in analytic models of distribution channels, including double marginalization, coordination, incentive alignment and contract design, strategic substitutability and complementarity, externalities, and principal–agent problems. Next, the paper summarizes research presented in the session on analytic models in channels at the Erin Anderson conference; and finally, the paper suggests avenues for future analytic modeling research. 相似文献