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Control Technology, 2020,29(1):1 ~2. [6] US National Instruments Inc. Measurement and automation catalogue[M]. ., 2020. [7] Zhang Hesheng, Zhang Jian. Study on antiinterference technique of puterized test amp。vis the speed of the airflow。 is the flow coefficient。 autotesting。所示圖 2 ,每一個(gè)點(diǎn)是數(shù)值的測(cè)試信號(hào), 并且接駁線是表現(xiàn)擬合曲線基于最小二乘法。此外,基于最小二乘法的風(fēng)機(jī)性能曲線可裝有自由挑選合適的模塊 。 軟件的結(jié)構(gòu) 該軟件是由 LabWindows / CVI 的這是一個(gè)綜合性的 ANSI C 環(huán)境工程師和科學(xué)家創(chuàng)造虛擬儀表應(yīng)用 。什么是所謂的 最小二乘法 ,是統(tǒng)計(jì)學(xué)處理實(shí)測(cè)值,從實(shí)驗(yàn)中,使理想值的觀測(cè)等于它的理論價(jià)值和糾正觀測(cè)值 。三個(gè)數(shù)字輸入 /輸出端口上 6024e是用來(lái)發(fā)送出了 3 相脈沖控制旋轉(zhuǎn)角度的一步馬達(dá)。兩個(gè) 12位模擬輸出也可以推薦,由 6024e。 該系統(tǒng)已廣泛地應(yīng)用于許多范生產(chǎn)廠家和科研單位 。組合傳感器技術(shù),計(jì)算機(jī)技術(shù)和測(cè)試技術(shù),虛擬儀器儀表技術(shù),使得最普遍 的方法 使用智能計(jì)算機(jī),以徹底打破該模式,傳統(tǒng)的技術(shù) 是指由制造商 制定 ,但該用戶不能改變的。性能試驗(yàn) 。試驗(yàn)結(jié)果表明本系統(tǒng)增加了試驗(yàn)過(guò)程的穩(wěn)定性 ,避免了人為的讀數(shù)誤差、計(jì)算誤差以及相關(guān)數(shù)據(jù)不能同時(shí) 記錄所引起的試驗(yàn)結(jié)果偏差 ,提高了測(cè)試精度和試驗(yàn)效率。此外,測(cè)試 最 重要的是檢驗(yàn)產(chǎn)品和 創(chuàng) 新設(shè)計(jì)產(chǎn)品。 因此,該系統(tǒng)不僅可以自動(dòng) 采料 ,加工,試驗(yàn)數(shù)據(jù),并 以適當(dāng) 的形式 顯 示最后結(jié)果,而且也控制和調(diào)整不同的工作負(fù)載。需要 考慮的技術(shù)指標(biāo),如采樣頻率,精度 等 級(jí), A / D & D / A 轉(zhuǎn)換利率 結(jié)果 中,數(shù)據(jù)采集卡的 PCI 6024e ,其中 200個(gè)有 KS /秒, 12位表 示 16 單端模擬輸入,是選定的。風(fēng)扇轉(zhuǎn)速的變化與變數(shù)電壓 。 計(jì)算性能參數(shù) 是指以國(guó)家標(biāo)準(zhǔn) gb1236 85 [ 8 ] 空氣動(dòng)力學(xué)性能測(cè)試程序呼吸機(jī),呼吸機(jī)性能測(cè)試的放電插座的實(shí)現(xiàn)。尼什若干樣本點(diǎn) 。 3 )主控站:這個(gè) 系統(tǒng) 是主接口為 運(yùn)作口 。 最后,該軟件系統(tǒng)的關(guān)鍵功能如下:自動(dòng)獲取參數(shù)的范性能,調(diào)整轉(zhuǎn)速和通量風(fēng)機(jī),自動(dòng)生成記錄,測(cè)試和性能曲線,此外,該軟件還可以 顯示,保存和打印這些 信 號(hào)在圖形和數(shù)字形式。它符合有需要的科學(xué)生產(chǎn)和自動(dòng)化管理的現(xiàn)代工業(yè) 。 rotate speed sensor ( AKC205 type, accuracy is 0. 3%FS). The sensor outputs are all standard current signal with 4~20 mA. To meet the DAQ board input signal type and range, 0 ~ 5 V voltage signals are achieved from 4~20 mA current signals by an interface board which is used for signal transformation. Through the analog output channel on 6024E, 0~5 V voltage signal which is corresponding on 0~50 Hz of AC frequency, are sent out to control frequency converter ( type, MITSUDISHI, Japan). Then, the fan speed changes with variable voltage. The regulating unit of working status, which is designed by the authors, is the rotating baffle structure posed of round baffle, shaft coupling, creeper gear and step motor etc. (See the ). This kind of structure can not only realize the auto control but also is small and flexible. Three digital I/O port on the 6024E are used to send out three phase pulse to control the rotation angle of step motor. The step motor drives the round baffle through the creeper gear to revolve inside the wind pipe, resulting in the change of aperture gap between the round baffle and windpipe, thereby altering the flux of airflow inside the windpipe, namely the alteration of working status is realized. The creeper gear can prevent the position of round baffle changing when the airflow is too strong. To insure the measurement accuracy, several antiinterference means are adopted such as differential inputs of signals to eliminate the mon mode interference, good earth of signal line and instruments, digital filtering technology in software[7]. 3 Software design of the system Data processing Data processing in this system includes three aspects: processing acquired signals to weed out various disturbing signals。Pstis the static pressure。nis number of sample points。 control—— LabWindows/CVI [ J ]. Electronical Technology, 2020,(4):48~51(in Chinese). 。zis best fitted value ofy。Fis the torque between motor and fan。 D/A conversion rate, resolution, the DAQ board PCI6024E from National Instruments (), with which 200 ks/s, 12bit performance on 16 singleended analog inputs can be got up to, is selected. The 6024E features digital trig