基于DSP实现的SPWM算法在光伏并网逆变器中的应用

介绍了TMS320F28335数字信号处理芯片生成SPWM波,采用等面积算法。先分析了单极性/双极性控制、同步/异步调制、对称规则和不对称规则采样生成SPWM波算法原理,然后运用TMS320F28335芯片进行波形实现,产生的SPWM波,具有速度快、精度高、对称性好等优点。     

基于TMS320F2812的声信号采集滤波系统设计

本文主要研究基于TI的DSP（Digital Signal Processor）芯片TMS320F2812的数据采集和数字滤波的实现。数据采集部分通过TMS320F2812芯片上自带的12位ADC（Analogto Digital Converter）实现对一路模拟信号数据的采集;数字滤波部分采用两种不同性质滤波算法对采集转换后的数字信号进行数字滤波处理,滤波结果以波形的形式显示出来,验证了该设计的正确性。     

三种SPWM波形生成算法的分析与实现

变频技术作为现代电力电子的核心技术,集现代电子、信息和智能技术于一体.而SPWM(正弦波脉宽调制)波的产生和控制则是变频技术的核心之一.本文对SPWM波形生成的三种算法--对称规则采样法、不对称规则采样法和等效面积法分别加以分析,并通过高精度定点32位DSP微处理器TMS320F2812在线生成SPWM波形.实验表明采用对称规则采样法产生的SPWM波形.具有速度快、变频方便等优点.采用等效面积法产生的SPWM波形具有精度高、输出波形谐波小,对称性好等优点.不对称规则采样法的性能介于二者之间.     

基于DSP的规则采样法SPWM逆变器研究

首先论述了采用规则采样法实现SPWM波形的原理,然后重点介绍了基于TI公司的数字信号处理器TMS320 F2812来实现具体算法的步骤,详细分析了TMS320F2812的事件管理器的寄存器配置情况以及具体的软件设计流程.其次,分析了在驱动电路和主电路设计时应该注意的问题,强调了电位隔离和悬浮电压的重要性.最后,试制了样机,给出了样机运行时的波形图,验证了该方法的可行性.     

基于TMS320F2812的磁控电抗器的设计

提出了基于TMS320F2812的磁控电抗器的新型动态无功补偿方案.介绍了TMS320F2812的特点和磁控电抗器的原理,给出了基于TMS320F2812的磁控电抗器的软、硬件设计.     

基于CPLD的TMS320F2812硬件平台设计

本文介绍了32位定点数字信号处理器芯片TMS320F2812的主要特点,以及TMS320F2812的相关外部芯片扩展情况,并着重探讨了CPLD在TMS320F2812硬件开发中的应用,设计了一种CPLD DSP的硬件平台,此设计将DSP较强的数据运算能力与CPLD的高集成性、硬件可重复编程性结合在一起,使系统的设计过程更加的合理、紧凑和简化。     

基于ADS8365的高速同步数据采集系统

针对TMS320F2812难以对多路信号进行同步采样,介绍了一种基于AD转换芯片ADS8365与TMS320F2812DSP芯片构成的高速、并行高精度数据采集系统,包括硬件接口电路的设计、部分关键程序代码和实现AD采样的程序流程。     

基于TMS320F2812的直流伺服系统设计

介绍基于TMS320F2812芯片的直流伺服控制系统的设计.该系统采用位置、速度双闭环的控制结构和增量式PID算法,以满足快速性、高精度以及稳定性等方面的要求.     

基于DSP的同步正弦信号设计与实现

介绍了一种基于TMS320F2812的同步正弦信号生成电路的设计原理与实现办法。TMS320F2812是TI公司生产的一款高性能32位DSP芯片,它运行速度快,而且处理功能强大,适合快速算法的实现。将锁相环技术应用到同步正弦信号生成电路中,实现了对电网频率和相位的跟踪,增加了电路的稳定性。     

基于DSP和DDS技术的EAS扫频信号源设计

介绍了一种基于DSP和DDS的高精度扫频信号源的软硬件实现方案.利用DSP芯片TMS320F2812控制DDS芯片AD9834,可以产生EAS系统需要的7.7～8.7MHz频率范围内周期变化的高分辨率、转换速度快、输出频谱纯的扫频信号.文中主要介绍了TMS320F2812最小系统、AD9834与DSP的硬件接口设计、整个系统的软件编程.     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

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Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate