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大型收獲機械發(fā)動機孔組位置度誤差在線檢測方法
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國家重點研發(fā)計劃項目(2017YFD0700204)、北京市科技計劃項目(D161100003216002)和中央高校基本科研業(yè)務(wù)費專項資金項目(2017GX001)


Online Method for Large-scale Harvester Engine Punch Combination Position Accuracy Measurement
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    摘要:

    發(fā)動機是收獲機械的動力源,其安裝位置精度將直接影響整機裝配質(zhì)量,進(jìn)而關(guān)系機器的作業(yè)效率和可靠性。由于收獲機械底盤機架結(jié)構(gòu)復(fù)雜、表面粗糙度大,現(xiàn)有測量方法及設(shè)備難以滿足大跨距孔組位置度誤差測量需求,針對收獲機械發(fā)動機安裝孔位置度的自動化測量需求,提出了基于機器視覺的大跨距孔組位置度誤差在線檢測方法,通過建立孔組位置度誤差模型,使用多部工業(yè)相機獲取安裝孔二維圖像,通過相機在線標(biāo)定、圖像增強處理、特征提取、坐標(biāo)變換等手段,實時測取并計算安裝孔組之間的位置度誤差。在此基礎(chǔ)上,基于LabWindows/CVI平臺,開發(fā)了自動檢測軟件,實現(xiàn)了發(fā)動機安裝孔位置度的快速檢測。以某型玉米收獲機底盤機架發(fā)動機安裝孔組為對象開展了試驗研究,結(jié)果表明,利用該方法能夠有效獲取安裝孔組的位置度關(guān)系,建立的孔組位置度誤差模型能夠進(jìn)行誤差分析與評定,在分辨率和測量精度上均優(yōu)于傳統(tǒng)測量方式,檢測效率較高,能夠滿足生產(chǎn)線自動化檢測需求。

    Abstract:

    The engine is primary power source of harvester, and its punch combination position has a direct impact on machine assembly quality and further affections on operating efficiency and reliability of the whole machine. At present, the engine punch combination position measurement is mainly performed manually with quite low precision and bad consistency. Focused on the automatic measurement of engine punch combination position, a machine vision based online measurement method for engine punch combination position of large-scale harvesters was proposed in this paper through establishing a punch combination position error model. A certain number of cameras were used to capture the two-dimensional images of each energy mounting hole, and the punch combination position error was measured and calculated real-timely through online calibration, image enhancement, feature extraction, coordinate transformation and so on. On this basis, a measurement and control software was developed based on Labwindows/CVI, and realized the rapid measurement of punch combination position. In this paper, engine punch combination position of a certain type of harvesting chassis of corn harvester was studied. The experiment results showed that the punch combination position relationships could be achieved effectively, and the error analysis and assessment could be fulfilled by the established punch combination position error model. Furthermore, its measuring results were superior to traditional calipers measuring tools readings in resolution and accuracy with a highly efficiency. This proposed online measurement method could meet the demand of automated production-line measurements.

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張亞偉,王冬,陳度,王書茂,付函.大型收獲機械發(fā)動機孔組位置度誤差在線檢測方法[J].農(nóng)業(yè)機械學(xué)報,2017,48(s1):71-78. ZHANG Yawei, WANG Dong, CHEN Du, WANG Shumao, FU Han. Online Method for Large-scale Harvester Engine Punch Combination Position Accuracy Measurement[J]. Transactions of the Chinese Society for Agricultural Machinery,2017,48(s1):71-78.

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  • 收稿日期:2017-07-10
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  • 在線發(fā)布日期: 2017-12-10
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