本文選題：樣本熵　切入點(diǎn)：定量評價(jià)　出處：《焊接學(xué)報(bào)》2015年10期

【摘要】：針對焊接穩(wěn)定性定量評定困難的特點(diǎn),提出了一種基于電流樣本熵的焊接穩(wěn)定性評定方法.隨著電信號穩(wěn)定性降低,樣本熵均值變大,樣本熵標(biāo)準(zhǔn)差也變大,選用樣本熵的均值與標(biāo)準(zhǔn)差的乘積來量化焊接穩(wěn)定性.討論了嵌入維數(shù)、給定閾值和樣本長度對樣本熵的影響,對于研究的脈沖MIG焊電流信號,當(dāng)m=2,r=0.08,N=2000時(shí),樣本熵分布合理,計(jì)算所耗時(shí)間較小.最后做了三組脈沖MIG焊對比試驗(yàn).結(jié)果表明,通過樣本熵的均值與標(biāo)準(zhǔn)差的乘積評定的焊接穩(wěn)定性與實(shí)際焊縫質(zhì)量效果吻合;在相同給定電流下,樣本熵的均值與標(biāo)準(zhǔn)差的乘積越大,焊接穩(wěn)定性越差.
[Abstract]:In view of the difficulty of quantitative evaluation of welding stability, a welding stability evaluation method based on current sample entropy is proposed. With the decrease of electrical signal stability, the mean value of sample entropy and the standard deviation of sample entropy become larger. The effects of embedding dimension, given threshold and sample length on the sample entropy are discussed. For the pulse MIG welding current signal studied, the sample entropy distribution is reasonable when the sample entropy is 0. 08%. The result shows that the welding stability evaluated by the product of the mean value of sample entropy and standard deviation is in agreement with the effect of actual weld quality, and at the same given current, the welding stability is in good agreement with the actual welding quality. The bigger the product of mean value and standard deviation of sample entropy is, the worse the welding stability is.
【作者單位】： 龍巖學(xué)院機(jī)電工程學(xué)院;華南理工大學(xué)機(jī)械與汽車工程學(xué)院;
【基金】：廣東省省部產(chǎn)學(xué)研資助項(xiàng)目(2013B090600098) 龍巖市先進(jìn)機(jī)械設(shè)計(jì)制造技術(shù)公共服務(wù)平臺(2012LY01)
【分類號】：TG444.74

【參考文獻(xiàn)】

相關(guān)期刊論文 前4條

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本文編號：1660504