机载控制保护盒必须时刻监测机载发电机交流电压的电压和频率,当电压或频率出现超差时,及时切断向机载设备的供电,保护设备避免事故发生。针对某型直升机控制保护盒采用模拟电路方式进行测量误差大的缺点,以AT89S52单片机为核心,设计了一款数字式机载控制保护盒。该保护盒在实现原控制保护盒所用功能上,增加了声音告警功能,延时时间补偿算法的应用,使得控制盒动作时间可精确到毫秒。实际应用结果表明,该保护盒具有测量准确、可靠性高、成本低、体积小等优点。
上传时间: 2013-11-10
上传用户:aig85
为提高电容测量精度,针对电容式传感器的工作原理设计了基于PIC16LF874单片机电容测量模块。简单阐述了电容测量电路的应用背景和国内外研究现状,介绍了美国Microchip公司PIC16LF874单片机的特性。电容式传感器输出的动态微弱电容信号通过PS021型电容数字转换器把模拟量数据转换成数字量数据,所测数据由PIC16LF874单片机应用程序进行处理、显示和保存。实验结果表明,固定电容标称值为10~20 pF 的测量值相对误差在1%以内,同时也可知被测电容容值越大,测量值和标称值相对误差越小。 Abstract: To improve the accuracy of capacitance measurement,aimed at the principle of work of mercury capacitance acceleration transducer,the design of micro capacitance measurement circuit is based on the key PIC16LF874 chip. Briefly discusses the application of the capacitance measuring circuit for the background and status of foreign researchers,focusing on the United States PIC16LF874 microcontroller features. Capacitive sensor outputed signal through the dynamics of weak PS021-chip capacitors (capacitancedigital converter) to convert analog data into digital data,the measured data from the PIC16LF874 microcontroller application process, display and preservation. Experimental results show that the fixed capacitor 10pF ~ 20pF nominal value of the measured value of relative error is within 1%,but also it canbe seen the value of the measured capacitance larger,measuring value and the nominal value of relative error smaller.
上传时间: 2013-10-29
上传用户:wojiaohs
设计一种基于P89V51RD2的功率因数测量仪,采用光电隔离器和专用数码管驱动器。该测量仪是以增强型单片机P89V51RD2为核心,大大简化系统硬件设计。而软件部分采用模块化设计思想,采用中值滤波和小数补偿算法,实现功率因数的高精度测量。实验测试表明,该功率因数测量仪测量精度高,运行稳定可靠。 Abstract: A power-factor measurement instrument based on P89V51RD2is designed,which uses optical coupler and specific LED drive chip.The power factor measurement instrument uses P89V51RD2as a core of which greatly simplifies the system design.Furthermore,modularization software is developed in detail.The high precision power-factor measuring system is realized by the center value filter and fractional compensation algorithm.Experiments manifests that the power- factor measurement instrument is high precision,steady and reliable.
上传时间: 2014-12-27
上传用户:CHINA526
飞机电网故障时,机载电气盒必须在延迟时间内切断电网,保护机载设备。采用AT89S52设计的电气盒测试仪能够测试电气盒保护功能,测量延迟时间。实际应用结果表明,该测试仪具有测量准确、可靠性高、成本低等优点。 Abstract: The helicopter-electrical-box must shut off the helicopter power,protect the equipments of the helicopter when the helicopter power is failed.The tester for the helicopter-electrical-box based on AT89S52is used for testing the protect-ing function and measuring the delay time.Application results show this tester has some advantages,such as accurate mea-surement,high dependability,economical cost etc.
上传时间: 2014-12-27
上传用户:786334970
介绍了一种基于C8051F020单片机的多路压力测量仪。该测量仪选用电阻应变式压力传感器采集压力信号,并经放大电路处理后送入C8051F020单片机,再由C8051F020单片机内部的A/D转换器将采集到的压力信号进行模数转化,然后分别对数据进行存储和显示。该测量仪能测量6路压力信号,并且各测量点都能单独检测和设置。由于采用了C8051F020单片机,简化了硬件电路,增强了抗干扰能力,使得测量仪具有测量精度高,冲击小等特点。 Abstract: A measurement apparatus for multi-channel pressure based on single chip microcomputer is introduced.It can measure 6 channels signal of the pressure,and the pressure measure points can be detection and located individually.The pressure signal sampling is obtained by resistor stress-type pressure sensors,the digital signals of 6 channels are collected through amplifying and adjustment circuit of pressure signals and internal integrated A/D converter of MCU.Finally,and it realizes the function to store and display data separately.C8051F020 was used to made hardware circuit simple,and it also enhanced the anti-interference ability.It features high precision and little impact.
上传时间: 2013-11-16
上传用户:yare
介绍一种以MSP430单片机为基础的智能频率测量系统,采用硬件逻辑与软件指令相结合的方式控制闸门,实现0 MHz~10 MHz范围内无档切换的等精度测量。 Abstract: An intelligent frequency measurement system based on MSP430 singlechip is introduced. The system uses a way that can combine hardware logic and software instructions to contronl the strobe ,and completes the functions of equal precision in the range of 0MHz~10MHz without shifting
上传时间: 2013-10-28
上传用户:dbs012280
涡街流量计因其介质适应性强,无可动部件,结构简单、使用寿命长等诸多优点,在许多行业得到了广泛的应用。而在低流速下,涡街测量就凸显出了它的不足,涡街信号的信噪比很低,有用信号几乎被噪声淹没。普通的涡街流量计采用模拟信号处理方法,在正常流量范围内,涡街流量信号稳定、测量准确、实时性好;鉴于上述模拟涡街流量计具有的优势以及存在的不足,课题的目的是数字信号处理方法FFT应用于涡街流量仪表当中,采用双MSP430单片机的结构进行脉冲计频和FFT计算,并且实时进行脉冲输出及电流输出。使其具有测量下限低,抗干扰能力强,实时数字信号处理等特点。
上传时间: 2014-12-01
上传用户:wujijunshi
介绍了应用51单片机开发设计光栅尺位移测量系统的电路思路及软件设计方法。应用光栅位移传感器和辨向电路的设计原理,开发设计了一套在线测量位移装置,该装置测量精度可达到+-0.1MM,实现了在机床加工过程中实时检测工件尺寸
上传时间: 2013-11-23
上传用户:wushengwu
摘要:针对目前医院病房监护系统落后,大多仍依靠人工查房的现状,利用虚拟仪器软件LabVIEW和单片机系统,研制了一套多功能多参数病房监护系统。该系统利用单片机作为下位机,采集病人体征数据并通过串行通信口上传到上位机;上位机采用LabVIEW完成对上传数据的处理和图形显示,使医生在值班就可掌握病人体征参数,及时做出正确判断。经模拟运行证明,该系统使用方便,测量快速准确,可靠性强。关键词:LabVIEW 单片机 串行通信 传感器
上传时间: 2013-10-14
上传用户:gengxiaochao
摘要:介绍了磁致伸缩位移传感器的结构、工作原理及信号特点,利用单片机对位移进行精确的测量,并对磁致伸缩位移传感器的输出模拟信号进行数字化处理,得到准确的数字信号,使得磁致伸缩位移传感器操作简单、互换性好、有效传递数据距离长。关键词:磁致伸缩;传感器;单片机;数字化;位移
上传时间: 2014-01-23
上传用户:拢共湖塘