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畢業(yè)論文-基于labview數(shù)據(jù)處理軟件的設(shè)計(jì)-wenkub.com

2025-01-09 12:10 本頁(yè)面
   

【正文】 s team of more than 550 chefs. Many of the franchise39。s ancient tradition. ... It is not about exercise but to discover the sense of oneness with yourself, the world and 中北大學(xué) 2022 屆畢業(yè)設(shè)計(jì)說(shuō)明書 第 30 頁(yè) 共 28 頁(yè) nature.Zarthoshtimanesh, who runs his own yoga center, Iyengar Yogabhyasa, in the Indian financial capital of Mumbai, says: Chinese students are very respectful. For me, all students are the same no matter what their race is and where they e from. The most important thing is to remove mental walls. Zarthoshtimanesh learned yoga from the late Yogacharya Iyengar and traveled with the master to different countries. Consulate General of India in southern China39。s Pink Revolution, an annual campaign that seeks to raise awareness and funds for breast cancer research, the hotel recently announced. A major sponsor of the campaign for three years in a row, Conrad Macao has pledged to donate a portion of its proceeds to the fund, includ ing those collected from selling its popular bear and rubber duck merchandise, in limited pink editions. Pink is the theme for floral arrangements and decorations in the hotel in October. In addition, on Fridays that month, members of the management and staff will add something pink to their uniforms, regular s and handwritten guest cards. Breast cancer is the most prevalent type of cancer among women in Hong Kong and is also of significant concern in Macao and around the world, regardless of age, general manager Bede Barry said in a statement. The hotel has enlisted the support of a number of international and local celebrities to help drive the cause, including South Korean actor Jung Suk Won. This year, a lucky guest who stays at the hotel during the campaign and also donates money for the cause will win a necklace specially designed by Arte Madrid, a Spanish jewelry brand. Women should strive to balance quality of work and life, and have children at a young age. As a doctor I see much suffering because of this imbalance. Xiao Ying, 36, works for a large law firm. Her job means lots of travel, a heavy caseload and a large number of meetings, so her schedule is hectic. She has been pregnant twice, but had abortions on both occasions because she felt her busy, highpressure career wasn39。s smoggy days. If the smog is severe, I39。s annual National Day for Eye Care, the China Youth Development ServiceCenter and Zhejiang Medicine, a leading listed Chinese pharmaceutical pany, jointlyannounced the kickoff of the surve about one month, a questionnaire piled by top eye care medical experts in China willbe distributed through multiple online partners, including , as well asthrough offline survey events held in universities, middle schools and primary schools acrossthe report will be released based on the survey statistics and analysis, and most importantly,guidelines for parents and youth on how to care for the eyes and prevent myopia — agrowing problem in China39。導(dǎo)師具有精益求精的學(xué)習(xí)態(tài)度和一絲不茍的工作作風(fēng),在軟件設(shè)計(jì)和論文寫作期間,導(dǎo)師豐富的實(shí)踐經(jīng)驗(yàn)、嚴(yán)謹(jǐn)?shù)闹螌W(xué)態(tài)度、友好的待人習(xí)慣,給我留下深刻印象,令我終生難忘,受益匪淺。 中北大學(xué) 2022 屆畢業(yè)設(shè)計(jì)說(shuō)明書 第 26 頁(yè) 共 28 頁(yè) 參 考 文 獻(xiàn) [1] 石川 ,張琳娜 ,劉武發(fā) .基于 LabVIEW 的數(shù)據(jù)采集與信號(hào)處理系統(tǒng)的設(shè)計(jì) [J].機(jī)械設(shè)計(jì)與制造 ,2022,5(11):2123. [2] 秦鑫 ,李東國(guó) .基于 LabVIEW 的數(shù)據(jù)采集與信號(hào)處理系統(tǒng)設(shè)計(jì) [J].信息通信 ,2022,43(7):50. [3] 李文軍,田瑞 利,易利鵬 .基于 LabVIEW 的數(shù)據(jù)采集與信號(hào)處理系統(tǒng) .現(xiàn)代電子技 術(shù) ,2022,20:1011 [4] LUO Man,ZHANG Xiaobing,YUAN LabVIEWbased Data Acquisition System and Signal Processing[J].Science and Technology,1992。 基于 LabVIEW 數(shù)據(jù)處理軟件實(shí)現(xiàn)了 課題要求的的基本功能,但相對(duì)于市場(chǎng)要求依然有很大差距,需要不斷改進(jìn)與完善,從而更好的實(shí)現(xiàn)軟件的市場(chǎng)化要強(qiáng)求。 如需離散實(shí)現(xiàn)該 VI,使 Y 代表序列,其 索引可以為負(fù), N 是輸入序列 X 中的元素個(gè)數(shù),并假設(shè) X中索引元素超出范圍的個(gè)數(shù)為零,如下列關(guān)系所示: xj = 0, j 0 或 j N 該 VI使用下列公式獲得 Y的元素: ??? ??? 10Nk kjk XXVj , j = –(N–1), –(N–2), …, –1, 0, 1, …, ( N–2), (N–1) 輸出序列 Rxx 的元素與 Y 序列中的元素 )1( ??? Nii yRxx i = 0, 1, 2, … , 2 N–2 輸出序列 Rxx 的元素個(gè)數(shù)為 2N–1。當(dāng) 時(shí) ,此時(shí) 可能趨近于一極限。 圖 為插值函數(shù),圖 為線性插值程序框圖: 圖 插值函數(shù) 圖 線性插值程序框圖 功率譜簡(jiǎn)介及設(shè)計(jì)方案 功率譜是功率譜密度函數(shù)的簡(jiǎn) 稱,它定義為單位頻帶內(nèi)的信號(hào)功率。因此,我們希望可以根據(jù)給定的函數(shù)表做一個(gè)既能反映函數(shù) f(x)的特性,又便于計(jì)算的簡(jiǎn)單函數(shù) P(x)。 對(duì)于一維信 號(hào),該 VI使用快速傅立葉變換算法計(jì)算輸入序列的離散傅立葉變換(DFT)。在大多數(shù)情況下, Bisquare 方法對(duì)于超出區(qū)間的數(shù)不如最小絕對(duì)殘差方法敏感。 中北大學(xué) 2022 屆畢業(yè)設(shè)計(jì)說(shuō)明書 第 17 頁(yè) 共 28 頁(yè) 圖 最小二乘法的多項(xiàng)式擬合 如選擇最小二乘法,該 VI 可依據(jù)下列等式最小化 殘差 ,查找多項(xiàng)式模型的 多項(xiàng)式系數(shù) : ??? ?10 2)(1 Ni iii vfwN N 是 Y 的長(zhǎng)度, wi 是 權(quán)重 的第 i 個(gè)元素, fi是 最佳多項(xiàng)式擬合 的第 i 個(gè)元素, yi 是 Y 的第 i 個(gè)元素。 圖 Bisquare 線性擬合 中北大學(xué) 2022 屆畢業(yè)設(shè)計(jì)說(shuō)明書 第 16 頁(yè) 共 28 頁(yè) 圖 為線性擬合 VI,圖 為線性擬合程序框圖: 圖 線性擬合 VI 圖 線性擬合程序框圖 廣義多項(xiàng)式擬合簡(jiǎn)介及設(shè)計(jì)方案 該 VI可使數(shù)據(jù)擬合為通用形式由下列等式描述的多項(xiàng)式函數(shù): ??? mj jiji xaf 0 f 為 最佳多項(xiàng)式擬合 的輸出序列, x 是輸入序列 X, a 是 多項(xiàng)式系數(shù) , m是 多項(xiàng)式階數(shù) 。下圖為對(duì)最小二乘法、最小絕對(duì)殘差和 Bisquare 擬合方法的比較結(jié)果。下圖為使用該方法的指數(shù)擬合。保存邊緣的特性使它在不希望出現(xiàn)邊緣模糊的場(chǎng)合也很有用。觀察窗口中的數(shù)值進(jìn)行排序,位于觀察窗中間的中值作為輸出。 有限長(zhǎng)單位沖激響應(yīng)( FIR)濾波器有以下特點(diǎn): (1) 系統(tǒng)的單位沖激響應(yīng) h (n)在有限個(gè) n值處不為零 (2) 系統(tǒng)函數(shù) H(z)在 |z|0處收斂,極點(diǎn)全部 在 z = 0處( 因果系統(tǒng) ) (3) 結(jié)構(gòu)上主要是非遞歸結(jié)構(gòu),沒有輸出到輸入的反饋,但有些結(jié)構(gòu)中(例如頻率抽樣結(jié)構(gòu))也包含有反饋的遞歸部分。其他濾波器高階的振幅對(duì)角頻率圖和低級(jí)數(shù)的振幅對(duì)角頻率有不同的形狀。一階巴特沃斯濾波器的衰減率為每倍頻 6分貝,每十倍頻 20分貝。這種濾波器最先由英國(guó)工程師斯替芬切比雪夫。切比雪夫?yàn)V波器在過(guò)渡帶比巴特沃斯濾波器的衰減快,但頻率響應(yīng)的幅頻特性不如后者平坦。 VI 前面板及運(yùn)行結(jié)果如圖 所示, VI 的程序框圖如圖 所示: 圖 程序前面板 圖 二進(jìn)制文件讀取 VI 程序框圖 中北大學(xué) 2022 屆畢業(yè)設(shè)計(jì)說(shuō)明書 第 9 頁(yè) 共 28 頁(yè) 電子表格文件的讀取 使用“讀取電子表格文件 VI”將保存在文件中的數(shù)據(jù)逐個(gè)讀出。 中北大學(xué) 2022 屆畢業(yè)設(shè)計(jì)說(shuō)明書 第 7 頁(yè) 共 28 頁(yè) 3 系統(tǒng)的軟件設(shè)計(jì) 軟件總體概況 如圖 所示為數(shù)據(jù)處理軟件前面板,中間部分為圖形顯示區(qū),能夠顯示文件的波形和處理后的波形,左下角有退出和保存按鈕,可對(duì)文件進(jìn)行打開和保存,右邊為數(shù)據(jù)處理區(qū),有各種不同的數(shù) 據(jù)處理算法,例如 Butterworth 濾波器簡(jiǎn), Chebyshev 濾波器,自相關(guān)等。 目前,數(shù)據(jù)處理系統(tǒng)廣泛的應(yīng)用于各行各業(yè),它們?cè)谙到y(tǒng)設(shè)計(jì)方法和原則、系統(tǒng)框架、需要解決的關(guān)鍵問題、實(shí)施過(guò)程等方面具有很強(qiáng)的共同性。數(shù)據(jù)的形式可以是數(shù)字、文字、圖形或聲音等。一個(gè)基本 VI包括前面板( front panel)、框圖程序( block diagram)以及圖標(biāo) /連接( icon/connector)三部分。 LabVIEW語(yǔ)言具有極好的模塊化功能,可以大大提高編程工作效率,是一款具有突出優(yōu)點(diǎn)的商品化虛擬儀器開發(fā)平臺(tái)。在表 中列出了虛擬儀器相對(duì)傳統(tǒng)儀器的優(yōu)點(diǎn)。目前較流行的集成開發(fā)環(huán)境有 LabVIEW、 LabWindows/CVI、 AgilentVEE等。 虛擬儀器系統(tǒng)由硬件和和軟件兩大部分構(gòu)成,硬件構(gòu)成虛擬儀器的基礎(chǔ),軟件構(gòu)成虛擬儀器的核心。隨著 PC、半導(dǎo)體和軟件功能的進(jìn)一步更新,未來(lái)虛擬儀器技術(shù)的發(fā)展將為測(cè)試系統(tǒng)的設(shè)計(jì) 提供一個(gè)極佳的模式,并且使工程師們?cè)跀?shù)據(jù)采集和數(shù)據(jù)處理方面得到強(qiáng)大功能和靈活性。 甘肅省計(jì)量研究院,李寶泉教授認(rèn)為:為了在保證工作質(zhì)量的前提下快速
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