隨著現代科學技術的迅速發展和人們對數據采集技術要求的日益提 高,近年來數據采集技術得到了長足的發展,主要表現為精度越來越高, 傳輸的速度越來越快。但是各種基于ISA、PCI 等總線的數據采集系統存 在著安裝麻煩、受計算機插槽數量、地址、中斷資源的限制、可擴展性 差等缺陷,嚴重的制約了它們的應用范圍。USB 總線的出現很好的解決了 上述問題,它是1995 年INTEL、NEC、MICROSOFT、IBM 等公司為解決傳 統總線的不足而推出的一種新型串行通信標準。為了適應高速傳輸的需 要,2004 年4月,這些公司在原來1.1 協議的基礎上制定了USB2.0 傳輸 協議,使傳輸速度達到了480Mb/s。該總線具有安裝方便、高帶寬、易擴 展等優點,已經逐漸成為現代數據采集傳輸的發展趨勢。 以高速數字信號處理器(DSPs)為基礎的實時數字信號處理技術近 年來發展迅速,并獲得了廣泛的應用。TMS320C6713 是德州儀器公司 ( Texas Instrument ) 推出的浮點DSPs , 其峰值處理能力達到了 1350MFLOPS,是目前國際上性能最高的DSPs 之一。同時該DSPs 接口豐 富,擴展能力強,非常適合于做主控芯片。 基于TMS320C6713 和USB2.0,本文設計了一套多路實時信號采集系 統。該設計充分利用了高速數字信號處理器TMS320C6713 和USB 芯片 CY7C68001 的各種優點,實現了傳輸速度快,采樣精度高,易于擴展,接口簡單的特點。在本文中詳細討論了各種協議和功能模塊的設計。本文 的設計主要分為硬件部分和軟件部分,其中硬件部分包括模擬信號輸入 模塊,AD 數據采集模塊,USB 模塊,所有的硬件模塊都在TMS320C6713 的協調控制下工作,軟件部分包括DSP 程序和PC 端程序設計。總的設計 思想是以TMS320C6713為核心,通過AD 轉換,將采集的數據傳送給 TMS320C6713 進行數據處理,并將處理后的數據經過USB 接口傳送到上位 機。
上傳時間: 2013-04-24
上傳用戶:fudong911
無刷直流電機,是隨著電力電子技術的發展和新型永磁材料的出現而迅速成熟起來的一種機電一體化電機.隨著無刷直流電機在各個領域的廣泛應用,其常用的帶位置傳感器控制方法暴露出了越來越多的局限性.同時,隨著計算機技術和電子技術的不斷發展,基于高性能數字信號處理器的"狀態觀測器"法無位置傳感器控制則漸漸成為研究的熱點.論文在詳細介紹了"擴展卡爾曼濾波法"無位置傳感器無刷直流電機控制原理的基礎上,建立了基于"擴展卡爾曼濾波法"無位置傳感器無刷直流電機控制系統模型,對模型中誤差造成的原因作出了定性和定量的分析,給出了解決的辦法.另外,論文以Texas Instrument公司的TMS320LF2407A數字信號處理器為核心,設計了一套基于"擴展卡爾曼濾波法"的無位置傳感器無刷直流電機控制系統,并給出了各模塊的設計電路.文中介紹了系統的各個組成部分,并給出了系統的抗干擾措施."三段式"起動技術是無傳感器無刷直流電機控制中的常用起動方法,也是"擴展卡爾曼濾波法"控制中的一個重要環節.文中對"三段式"起動技術中轉子定位、外同步加速和外同步到自同步的切換三部分進行了詳細的分析和討論,指出了各部分的難點,給出了相應的解決方法.基于"擴展卡爾曼濾波法"的控制系統中包含了大量的運算和多路的AD采集,因此不可避免存在系統和測量誤差以及干擾噪聲,論文著重對系統誤差、量測誤差和干擾噪聲三個方面作了詳細的分析,并提出了解決的方法.對于噪聲信號的數字化處理,論文探討了常用的幾種數字濾波算法并給出了仿真波形.在前面所設計的控制系統的基礎上,論文介紹了"擴展卡爾曼濾波法"無位置傳感器無刷直流電機控制系統的運行調試過程,分析了調試中出現的問題并提出了解決的方法.最后,文中給出了系統調試中的電壓、反電勢以及相電流等信號的實測波形,并與仿真結果作了比較分析.
上傳時間: 2013-07-30
上傳用戶:gongxinshiwo@163.com
設計一種基于P89V51RD2的功率因數測量儀,采用光電隔離器和專用數碼管驅動器。該測量儀是以增強型單片機P89V51RD2為核心,大大簡化系統硬件設計。而軟件部分采用模塊化設計思想,采用中值濾波和小數補償算法,實現功率因數的高精度測量。實驗測試表明,該功率因數測量儀測量精度高,運行穩定可靠。 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.
上傳時間: 2014-12-27
上傳用戶:CHINA526
首先研究CAN總線和SAE J1939協議,提出一種基于MC9S12HZ256微控制器的總線式汽車數字儀表解決方案。詳細介紹SAE J1939協議的報文幀格式及應用層協議中發動機相關參數的定義,以及步進電機及其驅動和車速信號的處理方法。該數字儀表系統硬件平臺由微處理器和信號采集和信息處理及顯示等模塊組成。軟件設計部分編程實現了對CAN總線和各傳感器數據的讀取、處理。該系統能夠實時反映車輛工況。 Abstract: In this paper,CAN bus and SAE J1939protocol are researched,and a vehicle digital Instrument solution based on MC9S12HZ256MCU is proposed.The message frame format and some engine-related parameters’definition in SAE J1939application layer protocol are introduced in detail.Stepper motor and its driver,the methods of speed signal process-ing are also introduced.The hardware platform of vehicle digital Instrument is composed by MCU,signal acquisition mod-ule,and signal processing and displaying module.Data receiving and processing from CAN bus and sensors are accom-plished by programming,and vehicle condition can be reflected in real-time.
上傳時間: 2013-10-20
上傳用戶:huannan88
介紹一種基于C8051單片機的動態心電監護系統。該系統由兩部分組成:以C8051F320單片機為核心的數據采集裝置和以PC機為平臺的分析處理系統。硬件電路功耗低,由單片機自帶的USB接口將數據傳送給PC機。軟件平臺采用LabVIEW可視化虛擬儀器系統開發平臺,將傳統儀器的功能模塊集成到計算機中,用戶可通過修改虛擬儀器的程序改變其功能。采用USB接口實時傳輸心電數據,并將數據采集模塊設計為計算機外設,使該系統高速快捷、小巧便攜。 Abstract: In this design,a low-cost ECG electrocardiogram monitoring system is introduced,which consists of two parts:data acquisition device based on C8051F320and PC terminal as the analysis and processing system.The system is low-power consumption,the data is transmitted to the PC terminal by USB interface of the C8051F320.By using the visible virtual Instrument system developing platform LabVIEW,the traditional Instruments function modules are integrated into the computer,so the user can modify virtual Instrument software to change its function to meet their needs.Using USB in-terface to realize real-time ECG data transmission,in addition,ECG data acquisition module is designed as the computer peripheral,which makes the syetem high-speed and portable.
上傳時間: 2013-11-13
上傳用戶:zhangzhenyu
提出了一種基于C8051F320的列車安全巡檢儀的設計方案,詳細闡述了巡檢儀的各個模塊的硬、軟件設計。巡檢儀集信息采集、軸溫檢測、照明和記錄存儲等功能于一體,實現了對列車安全巡檢工作有效的監督和科學管理。系統軟件采用C51編寫,對單片機進行有效的電源管理,保證了巡檢儀的穩定性、可靠性和低功耗性。 Abstract: This paper puts forward a design of train safety inspection based on C8051F320,describes all modules hardware and software design of inspection Instrument.The inspection Instrument has the function of information collection, axle’s temperature detection, lighting and records storage.It can supervise and administer train safety inspection work effectively.The system software using C51 can manage the power of single chip microcomputer, and guarantee the stability, reliability and low power consumption of the inspection Instrument.
上傳時間: 2013-12-22
上傳用戶:落花無痕
介紹了基于單片機航空交流電參數測試儀的系統設計。以Silicon Labs公司的C8051F005單片機為核心設計出數據采集板,通過RS-232串口與上位機通訊。運用Lab Windows/CVI編寫的上位機軟件實現信號的檢測以及波形和數據的顯示,給出了測試儀硬件電路的組成和軟件流程圖。本系統具有硬件結構簡單、容易實現和成本低等特點,在實際應用中其穩定性、精確性均能滿足客戶要求。 Abstract: The design of aeronautics AC parameters tester based on the single-chip is introduced.The core component of data acquisition board is C8051F005 single chip of Silicon Labs Company,and communication with PC through RS-232. The signal processing software programmed with LabWindows/CVI can be used successfully to fulfill inspection of signal and display of the waveform and data. The hardware and software configuration of test Instrument are provided.The hardware of the system is simple, and can be easily realized.The stability and precision of the measurement Instrument are enough to meet the requirements.
上傳時間: 2013-11-18
上傳用戶:wang5829
為解決輸油管道溫度壓力參數實時監測的問題,設計了以C8051F930單片機作為控制核心的超低功耗輸油管道溫度壓力遠程監測系統。現場儀表使用高精度電橋采集數據,通過433 MHz短距離無線通信網絡與遠程終端RTU進行通信,RTU通過GPRS網絡與PC上位機進行遠程數據傳輸,在上位機中實現數據存儲和圖形化界面顯示,從而實現輸油管道溫度壓力參數的實時監測和異常報警。經實驗證明,該系統的12位數據采集精度滿足設計要求,漏碼率小于1%,正常工作時間超過5個月,能實時有效地監測輸油管道的溫度壓力參數,節省大量人工成本,有效預防管道參數異常造成的經濟損失和環境污染。 Abstract: In order to solve the problems on real-time monitoring of pipeline temperature and pressure parameters, the ultra-low power remote pipeline temperature and pressure monitoring system was designed by using the single chip processor C8051F930 as the control core. The high-precision electric bridge was used in field Instruments for data collection, the 433MHz short-range wireless communication network was used to make communication between field Instrument and RTU, the GPRS was used by the RTU to transmit data to the PC host computer, and the data was stored and displayed in the PC host computer, so the real-time monitoring and exception alerts of pipeline temperature and pressure parameters were achieved. The experiment proves that the system of which error rate is less than 1% over five months working with the 12-bit data acquisition accuracy can effectively monitor the pipeline temperature and pressure parameters in real time, it saves a lot of labor costs and effectively prevents environmental pollution and economic losses caused by abnormal channel parameters.
上傳時間: 2013-11-07
上傳用戶:cuibaigao
針對船舶氣象儀保障維修而設計的船舶氣象儀測試系統,包括信息處理終端、主儀器檢測模塊、傳感器檢測模塊,各個模塊都采用基于AVR單片機的嵌入式系統,模塊之間通過CAN總線進行通信。結果表明,船舶氣象儀測試系統能夠快速檢測船舶氣象儀故障,與單純依靠人工方式排查故障相比,故障檢測時間縮短了60%以上。 Abstract: The test system of ship meteorological Instrument was developed to satisfy the maintenance of ship meteorological Instruments,which composed of information processing terminal, testing module of main Instrument and testing module of sensors. Each of these modules included an embedded system based on microcontroller of AVR series and communicated with other module by CAN bus. The results show that the test system can judge the fault of ship meteorological Instrument quickly and shorten the fault detection time as much as 60% compared with simple manual troubleshooting.
上傳時間: 2013-11-23
上傳用戶:stvnash
為提升虛擬儀器傳輸速率與實時性能,擴展監測范圍,在VC的軟件平臺上設計了一種全功能虛擬示波器。與傳統虛擬示波器相比,該系統采用嵌入式系統完成信號采集,采用工業以太網為傳輸介質,通過線性插值算法和多線程編程思想,實現波形顯示、參數計算、頻譜分析以及波形存儲及回放功能。實驗結果表明,該虛擬示波器可以實現20 kHz采樣頻率下的波形精確顯示,達到預期的各項指標。 Abstract: o enhance the transfer rate and real-time of virtual Instrument performance, expand scope of monitoring, this paper uses the VCs software platform to design a fully functional virtual oscilloscope. Compared with traditional virtual oscilloscope, this system adopts the embedded system to complete the data acquisition, industrial Ethernet as the transmission medium used by the linear interpolation algorithm and multi-threaded programming ideas, namely to achieve waveform display, parameter calculation, spectrum analysis and waveform storage and playback. Experimental results show that the virtual oscilloscope can accurately display the waveform with 20kHz sampling frequency, and achieve the desired targets.
上傳時間: 2013-11-25
上傳用戶:wbwyl