共查询到20条相似文献，搜索用时 625 毫秒
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高速芯片作为仪器仪表系统的主要功率元件,工作时通常会产生热量。为避免芯片温度过高导致其性能恶化,需要对芯片采取冷却。通过温度传感器集成电路测量高速芯片温度并智能调节风扇转速,采用PWM技术驱动风扇,并设计合理的风扇电源供电方案,在温度较低时可最大限度降低风扇转速和噪声水平。 相似文献
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设计一种基于STC89C52RC单片机的智能帆板控制系统。采用编码器作为角度传感器,通过单片机对辨向电路信号的数据进行处理并实时显示。利用脉宽调制控制技术,通过改变信号的占空比调节风机风速控制角度。运用超声波进行实时测距,根据风机与帆板的距离调整脉宽,步距,使得电机能够迅速准确的驱动帆板达到指定角度。通过实验分析,系统能够实现从0度到60度的帆板角度匀速控制,完成了帆板控制系统的数字输入智能控制,并且能够通过人为设置角度后智能控制程序使得帆板达到要求的角度。 相似文献
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梁国祥 《宁德师专学报(自然科学版)》2012,24(2):173-177
提出一种以单片机AT89C52为核心控制芯片的风扇智能控制器的设计.主要介绍了红外接收电路、过零检测电路和交流电机驱动电路模块的设计.实现了调节风量,定时关机,模拟自然风等功能.系统运行稳定、安全可靠,具有一定的应用推广价值. 相似文献
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系统以Raspberry Pi 3B+为核心处理器,通过摄像头采集图像进行人脸检测,进而在一定角度内控制风扇的关停和自动跟踪.Raspberry Pi与ESP8266微控制器配合,利用温、湿度传感器实时采集环境温度和湿度,自动调节风扇的转速.同时对摄像头进行远程控制,最终实现智能风扇系统的设计.经过测试,人脸检测准确度较高,能够很好地满足应用要求. 相似文献
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卢超 《实验室研究与探索》2010,29(6):54-57
设计了一种步进电机控制系统,使用C51单片机控制4相步进电机,由单片机产生驱动脉冲信号,通过键盘设定步进电机的步进方向和步进速度,在液晶显示器上显示步进角度、步进方向和步进速度,并通过仿真软件Proteus对系统做了仿真和测试。整个系统采用模块化设计,结构简单可靠。 相似文献
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王瑞 《延安教育学院学报》2012,26(1):102-104
基于AT89S52单片机为核心脉冲宽度调制（PWM）设计电机控制。该系统以帆板为例：通过AT89S52单片机作为中心控制部件;PWM控制直流电机驱动电路;A／D转换及传感器电路角度传感器采集来的模拟信号转换成单片机可识别的数字信号;键盘电路控制直流电机的加减速及控制风扇的风力大小;显示键盘显示帆板实时度数;声光提示电路作为帆板控制系统中的测试电路。完成对风扇转速的控制,调节风力大小,以改变帆板转角的控制功能。 相似文献
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《南阳师范学院学报》2020,(1):31-35
该设计以STC89C51单片机作控制核心,通过TB6612FNG电机驱动芯片控制电机,配合红外传感器、舵机、颜色识别等元件及供电装置构成智能物料搬运小车.可实现自主循迹且将不同颜色的物块运送到指定位置的目的. 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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GUO Bao-feng Xiao Da-wei 《重庆大学学报(英文版)》2005,4(3):129-133
Using virtual reality for interactive design gives a designer an intuitive vision of a design and allows the designer to achieve a viable, optimal solution in a timely manner. The article discusses the process of making the Virtual Reality System of the Humble Administrator＇s Garden. Translating building data to the Virtual Reality Modeling Language （VRML） is by far unsatisfactory. This creates a challenge for computer designers to do optimization to meet requirements. Five different approaches to optimize models have been presented in this paper. The other methods are to optimize VRML and to reduce the file size. This is done by keeping polygon counts to a minimum and by applying such techniques as object culling and level-ofdetail switching. 相似文献