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鍛造延(yan)伸過(guo)程變形(xing)及壓力(li)的(de)計算(suan)

文章來源：sjzwx 更新時間：2013-12-27 09:45:39

 延(yan)(yan)(yan)(yan)(yan)伸(shen)或(huo)稱(cheng)拔長(chang)是鍛造(zao)工(gong)(gong)(gong)藝(yi)的(de)(de)(de)(de)(de)(de)(de)(de)一(yi)(yi)(yi)項基本(ben)工(gong)(gong)(gong)序合理(li)(li)(li)地選擇延(yan)(yan)(yan)(yan)(yan)伸(shen)工(gong)(gong)(gong)藝(yi)參數(shu)可(ke)以(yi)在(zai)(zai)(zai)(zai)(zai)(zai)(zai)能(neng)量(liang)(liang)消(xiao)耗(hao)最(zui)(zui)小(xiao)的(de)(de)(de)(de)(de)(de)(de)(de)條(tiao)(tiao)件下(xia)(xia)通過(guo)均(jun)(jun)勻而恰(qia)當的(de)(de)(de)(de)(de)(de)(de)(de)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)來改(gai)善材料的(de)(de)(de)(de)(de)(de)(de)(de)組織和(he)性(xing)能(neng)因此(ci)(ci),鍛造(zao)延(yan)(yan)(yan)(yan)(yan)伸(shen)過(guo)程(cheng)(cheng)的(de)(de)(de)(de)(de)(de)(de)(de)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)分(fen)(fen)(fen)(fen)(fen)(fen)布(bu)及(ji)壓(ya)(ya)力(li)一(yi)(yi)(yi)直(zhi)是壓(ya)(ya)力(li)加工(gong)(gong)(gong)領(ling)域的(de)(de)(de)(de)(de)(de)(de)(de)重要研究課題(ti)(ti)之一(yi)(yi)(yi)五十年(nian)代(dai)起(qi)只(zhi)達(da)爾諾夫斯基等人(ren)在(zai)(zai)(zai)(zai)(zai)(zai)(zai)壓(ya)(ya)力(li)加工(gong)(gong)(gong)理(li)(li)(li)論方(fang)面(mian)應(ying)(ying)(ying)(ying)用(yong)(yong)(yong)(yong)塑(su)(su)性(xing)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)最(zui)(zui)小(xiao)勢能(neng)原(yuan)理(li)(li)(li)亦(yi)稱(cheng)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)分(fen)(fen)(fen)(fen)(fen)(fen)原(yuan)理(li)(li)(li)及(ji)里茲法研究了(le)(le)一(yi)(yi)(yi)系列壓(ya)(ya)力(li)加工(gong)(gong)(gong)過(guo)程(cheng)(cheng)的(de)(de)(de)(de)(de)(de)(de)(de)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)分(fen)(fen)(fen)(fen)(fen)(fen)布(bu)及(ji)力(li)的(de)(de)(de)(de)(de)(de)(de)(de)問(wen)題(ti)(ti)由(you)于(yu)(yu)塑(su)(su)性(xing)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)的(de)(de)(de)(de)(de)(de)(de)(de)應(ying)(ying)(ying)(ying)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)能(neng),不(bu)(bu)(bu)同(tong)于(yu)(yu)彈性(xing)問(wen)題(ti)(ti),無法表(biao)(biao)(biao)(biao)(biao)述(shu)成應(ying)(ying)(ying)(ying)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)分(fen)(fen)(fen)(fen)(fen)(fen)量(liang)(liang)的(de)(de)(de)(de)(de)(de)(de)(de)有理(li)(li)(li)函(han)數(shu),因此(ci)(ci)在(zai)(zai)(zai)(zai)(zai)(zai)(zai)計(ji)(ji)(ji)(ji)(ji)算(suan)(suan)應(ying)(ying)(ying)(ying)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)能(neng)時(shi)只(zhi)能(neng)采(cai)用(yong)(yong)(yong)(yong)誤差較(jiao)大的(de)(de)(de)(de)(de)(de)(de)(de)近似積分(fen)(fen)(fen)(fen)(fen)(fen)方(fang)法〔本(ben)文(wen)(wen)利用(yong)(yong)(yong)(yong)數(shu)值積分(fen)(fen)(fen)(fen)(fen)(fen)和(he)求極(ji)值的(de)(de)(de)(de)(de)(de)(de)(de)數(shu)值算(suan)(suan)法在(zai)(zai)(zai)(zai)(zai)(zai)(zai)計(ji)(ji)(ji)(ji)(ji)算(suan)(suan)機上(shang)求得(de)(de)(de)了(le)(le)在(zai)(zai)(zai)(zai)(zai)(zai)(zai)不(bu)(bu)(bu)同(tong)工(gong)(gong)(gong)藝(yi)幾何條(tiao)(tiao)件和(he)摩擦(ca)條(tiao)(tiao)件下(xia)(xia)的(de)(de)(de)(de)(de)(de)(de)(de)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)分(fen)(fen)(fen)(fen)(fen)(fen)布(bu),并通過(guo)能(neng)守恒(heng)關(guan)系求得(de)(de)(de)相(xiang)應(ying)(ying)(ying)(ying)的(de)(de)(de)(de)(de)(de)(de)(de)延(yan)(yan)(yan)(yan)(yan)伸(shen)壓(ya)(ya)力(li)在(zai)(zai)(zai)(zai)(zai)(zai)(zai)圖(tu)所示(shi)的(de)(de)(de)(de)(de)(de)(de)(de)延(yan)(yan)(yan)(yan)(yan)伸(shen)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)過(guo)程(cheng)(cheng)中(zhong)(zhong),我們假(jia)定(ding)(ding)材料為(wei)(wei)(wei)(wei)均(jun)(jun)勻連(lian)續、不(bu)(bu)(bu)可(ke)壓(ya)(ya)縮(suo)的(de)(de)(de)(de)(de)(de)(de)(de)理(li)(li)(li)想(xiang)剛塑(su)(su)體變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)為(wei)(wei)(wei)(wei)平(ping)(ping)面(mian)應(ying)(ying)(ying)(ying)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)型(xing),即(ji)(ji)假(jia)定(ding)(ding)方(fang)向(xiang)(xiang)無變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)寬,根據(ju)不(bu)(bu)(bu)可(ke)壓(ya)(ya)縮(suo)條(tiao)(tiao)件可(ke)得(de)(de)(de)二(er)一(yi)(yi)(yi),由(you)此(ci)(ci)可(ke)以(yi)假(jia)定(ding)(ding)工(gong)(gong)(gong)件在(zai)(zai)(zai)(zai)(zai)(zai)(zai)方(fang)向(xiang)(xiang)的(de)(de)(de)(de)(de)(de)(de)(de)厚度(du)為(wei)(wei)(wei)(wei)這(zhe)(zhe)一(yi)(yi)(yi)假(jia)定(ding)(ding)與(yu)(yu)實(shi)際變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)情(qing)況(kuang)有所不(bu)(bu)(bu)符(fu),但(dan)在(zai)(zai)(zai)(zai)(zai)(zai)(zai)較(jiao)大或(huo)幾較(jiao)小(xiao)的(de)(de)(de)(de)(de)(de)(de)(de)情(qing)況(kuang)下(xia)(xia)是可(ke)以(yi)接(jie)受的(de)(de)(de)(de)(de)(de)(de)(de)近似處理(li)(li)(li)方(fang)法在(zai)(zai)(zai)(zai)(zai)(zai)(zai)上(shang)下(xia)(xia)兩個錘砧作(zuo)用(yong)(yong)(yong)(yong)面(mian)上(shang)即(ji)(ji)土湯(tang),這(zhe)(zhe)一(yi)(yi)(yi)假(jia)定(ding)(ding)反映(ying)了(le)(le)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)過(guo)程(cheng)(cheng)中(zhong)(zhong)外部區對(dui)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)區的(de)(de)(de)(de)(de)(de)(de)(de)作(zuo)用(yong)(yong)(yong)(yong)‘為(wei)(wei)(wei)(wei)剪(jian)(jian)切屈服強(qiang)度(du)按照屈服準則,了(le)(le)萬在(zai)(zai)(zai)(zai)(zai)(zai)(zai)壓(ya)(ya)下(xia)(xia)量(liang)(liang)人(ren)很小(xiao)時(shi)△叼幾《可(ke)以(yi)認(ren)為(wei)(wei)(wei)(wei)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)是完全對(dui)稱(cheng)于(yu)(yu)圖(tu)所示(shi)座標軸的(de)(de)(de)(de)(de)(de)(de)(de)因此(ci)(ci),以(yi)下(xia)(xia)只(zhi)分(fen)(fen)(fen)(fen)(fen)(fen)析(xi)一(yi)(yi)(yi)平(ping)(ping)面(mian)的(de)(de)(de)(de)(de)(de)(de)(de)第一(yi)(yi)(yi)象(xiang)限塑(su)(su)性(xing)理(li)(li)(li)論的(de)(de)(de)(de)(de)(de)(de)(de)最(zui)(zui)小(xiao)勢能(neng)原(yuan)理(li)(li)(li)給(gei)出(chu)(chu)叭。其(qi)中(zhong)(zhong)為(wei)(wei)(wei)(wei)總變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)勢能(neng),為(wei)(wei)(wei)(wei)剪(jian)(jian)應(ying)(ying)(ying)(ying)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)強(qiang)度(du),萬為(wei)(wei)(wei)(wei)外力(li)在(zai)(zai)(zai)(zai)(zai)(zai)(zai)其(qi)與(yu)(yu)靜力(li)對(dui)應(ying)(ying)(ying)(ying)的(de)(de)(de)(de)(de)(de)(de)(de)位移上(shang)所作(zuo)的(de)(de)(de)(de)(de)(de)(de)(de)功(gong)本(ben)計(ji)(ji)(ji)(ji)(ji)算(suan)(suan)中(zhong)(zhong),由(you)于(yu)(yu)壓(ya)(ya)下(xia)(xia)量(liang)(liang)△是給(gei)定(ding)(ding)的(de)(de)(de)(de)(de)(de)(de)(de),因此(ci)(ci)在(zai)(zai)(zai)(zai)(zai)(zai)(zai)上(shang)述(shu)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)分(fen)(fen)(fen)(fen)(fen)(fen)中(zhong)(zhong)不(bu)(bu)(bu)再計(ji)(ji)(ji)(ji)(ji)人(ren)錘砧作(zuo)用(yong)(yong)(yong)(yong)力(li),而只(zhi)考慮表(biao)(biao)(biao)(biao)(biao)面(mian)摩擦(ca)阻(zu)力(li)叮,及(ji)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)區界(jie)(jie)面(mian)上(shang)的(de)(de)(de)(de)(de)(de)(de)(de)剪(jian)(jian)應(ying)(ying)(ying)(ying)力(li)‘,即(ji)(ji)有“其(qi)中(zhong)(zhong)分(fen)(fen)(fen)(fen)(fen)(fen)別(bie)為(wei)(wei)(wei)(wei)向(xiang)(xiang)的(de)(de)(de)(de)(de)(de)(de)(de)位移分(fen)(fen)(fen)(fen)(fen)(fen)量(liang)(liang)在(zai)(zai)(zai)(zai)(zai)(zai)(zai)界(jie)(jie)面(mian)上(shang)剪(jian)(jian)力(li)方(fang)向(xiang)(xiang)向(xiang)(xiang)上(shang),而在(zai)(zai)(zai)(zai)(zai)(zai)(zai)錘砧作(zuo)用(yong)(yong)(yong)(yong)面(mian)上(shang)摩擦(ca)力(li),指向(xiang)(xiang)為(wei)(wei)(wei)(wei)負圖(tu),因此(ci)(ci)式(shi)(shi)中(zhong)(zhong)加負號選擇滿足(zu)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)邊界(jie)(jie)條(tiao)(tiao)件的(de)(de)(de)(de)(de)(de)(de)(de)三(san)角級(ji)數(shu)來表(biao)(biao)(biao)(biao)(biao)述(shu)應(ying)(ying)(ying)(ying)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)分(fen)(fen)(fen)(fen)(fen)(fen)量(liang)(liang)。為(wei)(wei)(wei)(wei)待(dai)定(ding)(ding)系數(shu)由(you)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)的(de)(de)(de)(de)(de)(de)(de)(de)對(dui)稱(cheng)性(xing)可(ke)知二(er)應(ying)(ying)(ying)(ying)為(wei)(wei)(wei)(wei),,的(de)(de)(de)(de)(de)(de)(de)(de)偶函(han)數(shu),因此(ci)(ci)式(shi)(shi)中(zhong)(zhong)不(bu)(bu)(bu)出(chu)(chu)現正弦函(han)數(shu)利用(yong)(yong)(yong)(yong)小(xiao)應(ying)(ying)(ying)(ying)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)的(de)(de)(de)(de)(de)(de)(de)(de)應(ying)(ying)(ying)(ying)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)一(yi)(yi)(yi)位移關(guan)系及(ji)邊界(jie)(jie)條(tiao)(tiao)件。上(shang)式(shi)(shi)中(zhong)(zhong)‘△為(wei)(wei)(wei)(wei)平(ping)(ping)均(jun)(jun)壓(ya)(ya)縮(suo)應(ying)(ying)(ying)(ying)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)由(you)式(shi)(shi)可(ke)以(yi)得(de)(de)(de)出(chu)(chu)剪(jian)(jian)應(ying)(ying)(ying)(ying)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)分(fen)(fen)(fen)(fen)(fen)(fen)量(liang)(liang)在(zai)(zai)(zai)(zai)(zai)(zai)(zai)平(ping)(ping)面(mian)應(ying)(ying)(ying)(ying)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)條(tiao)(tiao)件下(xia)(xia)一(yi)(yi)(yi)了(le)(le)。及(ji)式(shi)(shi)逐步代(dai)人(ren)式(shi)(shi),在(zai)(zai)(zai)(zai)(zai)(zai)(zai)給(gei)定(ding)(ding)及(ji)值時(shi),塑(su)(su)性(xing)勢能(neng)即(ji)(ji)成為(wei)(wei)(wei)(wei)的(de)(de)(de)(de)(de)(de)(de)(de)函(han)數(shu)‘由(you)于(yu)(yu)式(shi)(shi)括弧中(zhong)(zhong)第一(yi)(yi)(yi)項積分(fen)(fen)(fen)(fen)(fen)(fen),通常(chang)不(bu)(bu)(bu)可(ke)能(neng)用(yong)(yong)(yong)(yong)解(jie)析(xi)法計(ji)(ji)(ji)(ji)(ji)算(suan)(suan),本(ben)文(wen)(wen)用(yong)(yong)(yong)(yong)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)步長(chang)辛普生(sheng)二(er)重積分(fen)(fen)(fen)(fen)(fen)(fen)程(cheng)(cheng)文(wen)(wen)獻〔計(ji)(ji)(ji)(ji)(ji)算(suan)(suan)結(jie)果(guo)序’進行數(shu)值積分(fen)(fen)(fen)(fen)(fen)(fen)再利用(yong)(yong)(yong)(yong)共扼方(fang)向(xiang)(xiang)法尋求使值為(wei)(wei)(wei)(wei)極(ji)小(xiao)的(de)(de)(de)(de)(de)(de)(de)(de)峭忠(zhong)石(shi)。,將(jiang)優化計(ji)(ji)(ji)(ji)(ji)算(suan)(suan)得(de)(de)(de)到的(de)(de)(de)(de)(de)(de)(de)(de)磷代(dai)人(ren),式(shi)(shi)即(ji)(ji)可(ke)求得(de)(de)(de)在(zai)(zai)(zai)(zai)(zai)(zai)(zai)給(gei)定(ding)(ding)、幾及(ji)‘下(xia)(xia)的(de)(de)(de)(de)(de)(de)(de)(de)應(ying)(ying)(ying)(ying)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)及(ji)位移利用(yong)(yong)(yong)(yong)能(neng)量(liang)(liang)守恒(heng)關(guan)系,即(ji)(ji)可(ke)求得(de)(de)(de)平(ping)(ping)均(jun)(jun)延(yan)(yan)(yan)(yan)(yan)伸(shen)壓(ya)(ya)力(li)對(dui),的(de)(de)(de)(de)(de)(de)(de)(de)比值表(biao)(biao)(biao)(biao)(biao)列出(chu)(chu)文(wen)(wen)〔采(cai)用(yong)(yong)(yong)(yong)近似積分(fen)(fen)(fen)(fen)(fen)(fen)得(de)(de)(de)到的(de)(de)(de)(de)(de)(de)(de)(de)結(jie)果(guo)與(yu)(yu)本(ben)文(wen)(wen)所得(de)(de)(de)結(jie)果(guo)表(biao)(biao)(biao)(biao)(biao)中(zhong)(zhong)可(ke)為(wei)(wei)(wei)(wei)街,‘比值由(you)于(yu)(yu)計(ji)(ji)(ji)(ji)(ji)算(suan)(suan)機時(shi)的(de)(de)(de)(de)(de)(de)(de)(de)限制,在(zai)(zai)(zai)(zai)(zai)(zai)(zai)。時(shi),取。。一(yi)(yi)(yi)在(zai)(zai)(zai)(zai)(zai)(zai)(zai)時(shi),取。。由(you)表(biao)(biao)(biao)(biao)(biao)可(ke)見,盡(jin)管兩種計(ji)(ji)(ji)(ji)(ji)算(suan)(suan)結(jie)果(guo)隨腸變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)化的(de)(de)(de)(de)(de)(de)(de)(de)趨勢相(xiang)同(tong),但(dan)數(shu)值計(ji)(ji)(ji)(ji)(ji)算(suan)(suan)的(de)(de)(de)(de)(de)(de)(de)(de)壓(ya)(ya)力(li)均(jun)(jun)小(xiao)于(yu)(yu)近似積分(fen)(fen)(fen)(fen)(fen)(fen)的(de)(de)(de)(de)(de)(de)(de)(de)計(ji)(ji)(ji)(ji)(ji)算(suan)(suan)值這(zhe)(zhe)是符(fu)合塑(su)(su)性(xing)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)的(de)(de)(de)(de)(de)(de)(de)(de)最(zui)(zui)小(xiao)勢能(neng)原(yuan)理(li)(li)(li)的(de)(de)(de)(de)(de)(de)(de)(de)表(biao)(biao)(biao)(biao)(biao)結(jie)果(guo)與(yu)(yu)文(wen)(wen)獻上(shang)的(de)(de)(de)(de)(de)(de)(de)(de)實(shi)驗(yan)數(shu)據(ju)頗(po)為(wei)(wei)(wei)(wei)接(jie)近,為(wei)(wei)(wei)(wei)了(le)(le)便于(yu)(yu)工(gong)(gong)(gong)程(cheng)(cheng)計(ji)(ji)(ji)(ji)(ji)算(suan)(suan),對(dui)表(biao)(biao)(biao)(biao)(biao)的(de)(de)(de)(de)(de)(de)(de)(de)壓(ya)(ya)力(li)用(yong)(yong)(yong)(yong)最(zui)(zui)小(xiao)二(er)乘法擬合后得(de)(de)(de)到以(yi)下(xia)(xia)二(er)次逼近函(han)數(shu)了(le)(le),上(shang)述(shu)逼近式(shi)(shi)與(yu)(yu)計(ji)(ji)(ji)(ji)(ji)算(suan)(suan)值的(de)(de)(de)(de)(de)(de)(de)(de)相(xiang)對(dui)誤差都小(xiao)于(yu)(yu)多結(jie)論與(yu)(yu)討論本(ben)文(wen)(wen)在(zai)(zai)(zai)(zai)(zai)(zai)(zai)文(wen)(wen)的(de)(de)(de)(de)(de)(de)(de)(de)基礎上(shang)利用(yong)(yong)(yong)(yong)數(shu)值積分(fen)(fen)(fen)(fen)(fen)(fen)和(he)數(shu)值優化方(fang)法求解(jie)鍛造(zao)延(yan)(yan)(yan)(yan)(yan)伸(shen)過(guo)程(cheng)(cheng)的(de)(de)(de)(de)(de)(de)(de)(de)塑(su)(su)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)分(fen)(fen)(fen)(fen)(fen)(fen)布(bu)及(ji)壓(ya)(ya)力(li)由(you)于(yu)(yu)鍛造(zao)延(yan)(yan)(yan)(yan)(yan)伸(shen)過(guo)程(cheng)(cheng)的(de)(de)(de)(de)(de)(de)(de)(de)復雜性(xing),在(zai)(zai)(zai)(zai)(zai)(zai)(zai)本(ben)計(ji)(ji)(ji)(ji)(ji)算(suan)(suan)模型(xing)中(zhong)(zhong)對(dui)邊界(jie)(jie)條(tiao)(tiao)件、變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)方(fang)式(shi)(shi)作(zuo)了(le)(le)一(yi)(yi)(yi)些假(jia)定(ding)(ding)這(zhe)(zhe)些假(jia)定(ding)(ding)在(zai)(zai)(zai)(zai)(zai)(zai)(zai)一(yi)(yi)(yi)定(ding)(ding)條(tiao)(tiao)件下(xia)(xia)是可(ke)以(yi)接(jie)受的(de)(de)(de)(de)(de)(de)(de)(de)從(cong)進一(yi)(yi)(yi)步改(gai)善計(ji)(ji)(ji)(ji)(ji)算(suan)(suan)模型(xing)的(de)(de)(de)(de)(de)(de)(de)(de)真實(shi)性(xing)和(he)精度(du)考慮,采(cai)用(yong)(yong)(yong)(yong)三(san)維應(ying)(ying)(ying)(ying)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)(bian)函(han)數(shu)和(he)增加三(san)角級(ji)數(shu)的(de)(de)(de)(de)(de)(de)(de)(de)項數(shu)都是可(ke)行的(de)(de)(de)(de)(de)(de)(de)(de)但(dan)計(ji)(ji)(ji)(ji)(ji)算(suan)(suan)工(gong)(gong)(gong)作(zuo)量(liang)(liang)將(jiang)大大增加這(zhe)(zhe)一(yi)(yi)(yi)方(fang)面(mian)工(gong)(gong)(gong)作(zuo)還有待(dai)探(tan)討計(ji)(ji)(ji)(ji)(ji)算(suan)(suan)站.