【正文】 s president, who is also a renowned tenor, tells China Daily. During a tour in 1985, he went to a village and met an elderly local man, who told him a story about his friendship with a solider from Shenyang, capital of Northeast China39。s villages and entertain nomadic families, but their fame has spread around the world. On May 16 and 17, nearly 100 singers and dancers from the troupe performed at Beijing39。t just about sharing art with nomadic families but also about gaining inspiration for the music and dance. Ulan Muqir literally translates as red burgeon, and today39。t help but sing the folk songs, Nasun says. The vastness of Inner Mongolia and the lack of entertainment options for people living there, made their lives lonely. The nomadic people were very excited about our visits, Nasun recalls. We didn39。s Zhangye city during their journey to Kazakhstan, May 5, 2022. The caravan, consisting of more than 100 camels, three horsedrawn carriages and four support vehicles, started the trip from Jingyang county in Shaanxi on Sept 19, 2022. It will pass through Gansu province and Xinjiang Uygur autonomous region, and finally arrive in Almaty, formerly known as AlmaAta, the largest city in Kazakhstan, and Dungan in Zhambyl province. The trip will cover about 15,000 kilometers and take the caravan more than one year to plete. The caravan is expected to return to Jingyang in March 2022. Then they will e back, carrying specialty products from Kazakhstan A small art troupe founded six decades ago has grown into a household name in the Inner Mongolia autonomous region. In the 1950s, Ulan Muqir Art Troupe was created by nine young musicians, who toured remote villages on horses and performed traditional Mongolian music and dances for nomadic families. The 54yearold was born in Tongliao, in eastern Inner Mongolia and joined the troupe in says there are 74 branch troupes across Inner Mongolia and actors give around 100 shows every year to local nomadic people. I can still recall the days when I toured with the troupe in the early 39。 表 71 2? 弧度內(nèi)行程變動(dòng)量 2pV? 和任意 300mm 行程內(nèi)行程變動(dòng)量 300pV （ m? ） 精度等級(jí) 1 2 3 4 5 2pV? 4 5 6 7 8 300pV 6 8 12 16 23 表 72 有效行程 uL 內(nèi)的目標(biāo)行程公差 pe 和允許的行程變動(dòng)量 upV （單位： m? ） 有效行程/mm 精度等級(jí) 1 2 3 4 5 pe upV pe upV pe upV pe upV pe upV ≤ 315 6 6 8 8 12 12 16 16 23 23 315～400 7 6 9 8 12 12 18 17 25 25 400～500 8 7 10 10 15 13 20 19 27 26 500～ 9 7 11 11 16 14 22 21 30 29 28 630 630～800 10 8 13 12 18 16 25 23 35 31 800～1000 11 9 15 13 21 17 29 25 40 33 1000～1250 13 10 18 14 24 19 34 29 46 39 29 為你提供優(yōu)秀的畢業(yè) 論文參考資料，請(qǐng)您刪除以下內(nèi)容， O(∩ _∩ )O 謝謝?。?！ A large group of tea merchants on camels and horses from Northwest China39。0 360L ???得0 0 . 1 51 0 0 . 0 0 4 2 4 . 23 6 0 3 6 0L m m m m m???? ? ? ? ? 27 確定滾珠絲杠螺母副的精度等級(jí)和規(guī)格型號(hào) 1 確定滾珠絲杠螺母副的精度等級(jí) 本機(jī)床工作臺(tái)采用半閉環(huán)控制系統(tǒng)， 300pV 、 pe 應(yīng)滿足下列要求： 30 0 K m a x0. 8 ( 0. 8pV ? ? ? ?? ? ? ? ? ?定 位 精 度 ） （ ） m= 19 .9 m m a ( ) 19 .9pKem? ? ?? ? ? ? ?定 位 精 度 滾珠絲杠螺母副擬采用的精度等級(jí)為 2 級(jí)，查表 71 得 300pV =8 m? ＜ m? ；查表214 得，當(dāng)螺紋長(zhǎng)度為 850mm 時(shí)， 15 m m????故滿足設(shè)計(jì)要求 確定滾珠絲杠螺母副的規(guī)格型號(hào) 滾珠絲杠螺母副的規(guī)格型號(hào)為 FFZD40105P2/1239 850,其具體參數(shù)如下。 3 計(jì)算滾珠絲杠因扭轉(zhuǎn)變形產(chǎn)生的誤差 （ 1）計(jì)算由快速進(jìn)給扭矩 KJT 引起的滾珠絲杠螺母副的變形量 ? 。 計(jì)算傳動(dòng)系統(tǒng)的誤差計(jì)算與分析 1 計(jì)算機(jī)械傳動(dòng)系統(tǒng)的方向死區(qū)△ 已知進(jìn)給傳動(dòng)系統(tǒng)的最小綜合拉壓剛度 6m in 35 4 10K N m m??，導(dǎo)軌的靜摩擦力0 2400FN? ，則由式 ( 《數(shù)控技術(shù)課程設(shè)計(jì)》 252)得 330 6m i n2 2 2 4 0 02 1 0 1 0 0 . 0 1 33 5 7 . 1 4 1 0F m m m mK?? ?? ? ? ? ? ? ?? 即 10 10 ,mm??? ? ? 故滿足要求。 表 41 FANUC i? 系列交流伺服電動(dòng)機(jī)的技術(shù)參數(shù) (來自《數(shù)控技術(shù)課程設(shè)計(jì)》表 247) 機(jī)械傳動(dòng)系統(tǒng)的動(dòng)態(tài)分析 1 計(jì)算絲杠 工作臺(tái)縱向振動(dòng)系統(tǒng)的最 低固有頻率 nc? 已知滾珠絲杠螺母副的綜合拉壓剛度 60 m in 3 5 7 .1 4 1 0 mK K N? ? ?，而滾珠絲杠螺母副和機(jī)床執(zhí)行部件的等效質(zhì)量 13dsm m m??（其中 m、 sm 分別是機(jī)床執(zhí)行部件的質(zhì)量（ kg ）和滾珠絲杠螺母副的質(zhì)量（ kg ），則 970m kg? 234 1 2 3 .9 7 .8 1 0 1 2 .1 44sm k g k g? ?? ? ? ? ? ? 11( 9 7 0 9 7 4 . 0 533dsm m m k g k g? ? ? ? ? ? ） 60 3 5 7 . 1 4 1 0 6 0 5 . 5 29 7 4 . 0 5nc dK r a d s r a d sm? ?? ? ? 2 計(jì)算扭轉(zhuǎn)振動(dòng)系統(tǒng)的最低固有頻率 nt? 折算到滾珠絲杠軸上的系統(tǒng)總當(dāng)量轉(zhuǎn)動(dòng)慣量為 2 2 20 ( 21 .4 3 11 .6 2) 33 .0 5 0. 00 33srJ J J k g c m k g c m k g m? ? ? ? ? ? ? ? ? 已知絲杠的扭轉(zhuǎn)剛度 K N m rad?? ? ?，則 1 1 0 6 2 .0 7 18310 .0 0 3 3sntsK r a d s r a d sJ? ? ? ? 由以上計(jì)算可知， 絲杠 工作臺(tái)縱向振動(dòng)系統(tǒng)的最低固有頻率 635nc rad s? ? 、扭轉(zhuǎn) 26 振動(dòng)系統(tǒng)的最低固有頻率 1831nt rad s? ? 都比較高。 （ 2）慣量匹配驗(yàn)算。 N m??，因此，不管采用何種加速方式，本電動(dòng)機(jī)均滿足加速力矩要求。主要技術(shù)參數(shù)如下 :額定功 率 3kw；最高轉(zhuǎn)速 3000 minr ；額定力矩12Nm? ；轉(zhuǎn)動(dòng)慣量 62 2kgcm? ；質(zhì)量 18kg. 交流伺服電動(dòng)機(jī)的加速力矩一般為額定力矩的 15倍。 ( 9 1 ) fT T T N m N m?? ? ? ? ? ? ? ④按式 ( 《數(shù)控技術(shù)課程設(shè)計(jì)》 259)計(jì)算工進(jìn)力矩 GJT 。 39。 ①按式 ( 《數(shù)控技術(shù)課程設(shè)計(jì)》 261)計(jì)算線性加速時(shí)空載啟動(dòng)力矩 qT ( ) ( 1 1 .7 7 2 .7 9 0 .2 1 ) 1 4 .7 7q ap fT T T T N m N m?? ? ? ? ? ? ? ? ? ②按式 ( 《數(shù)控技術(shù)課程設(shè)計(jì)》 259)計(jì)算階躍加速時(shí)空載啟動(dòng)力矩 39。 已知滾珠絲杠螺母副的預(yù)緊力 ,PFN? 滾珠絲杠螺母副的基本導(dǎo)程0 10 mm m??，滾珠絲杠螺母副的效率 0 ? ? ，由式 ( 《數(shù)控技術(shù)課程設(shè)計(jì)》 256)得 220 0 1 0 3 9 . 9 8 0 . 0 1( 1 ) ( 1 0 . 9 4 ) 0 . 2 12 2 3 . 1 4 0 . 9 0Pf FLT N m N m??? ?? ? ? ? ? ? ? ??? 3 計(jì)算坐標(biāo)軸折算到電動(dòng)機(jī)軸上的各種所需的力矩 （ 1）計(jì)算線性加速力矩 1aT 已知機(jī)床執(zhí)行部件以最快速度運(yùn)動(dòng)時(shí)電動(dòng)機(jī)的最高轉(zhuǎn)速 max 150 0 m innr? ，電動(dòng)機(jī)的轉(zhuǎn)動(dòng)慣量 262mJ kg cm??，坐標(biāo)軸的負(fù)載慣量 kg cm??，進(jìn)給伺服系統(tǒng)的位置環(huán)增益 20sZkH? ，加速時(shí)間 33 0 .1 520a st s sk? ? ?，由式 ( 《數(shù)控技術(shù)課程設(shè)計(jì)》 258) 得 m a x1 2 ( ) (1 )6 0 9 8 0 sakta m danT J J et? ?? ? ??2 0 0 . 1 52 3 .1 4 1 5 0 0 ( 6 2 5 6 .3 3 ) ( 1 )6 0 9 8 0 0 .1 5 e k g f c m????? ? ? ? ??? 12 0. 06 kgf cm???? 1/5000i? 2/5000i? 4/4000i? 8/3000i? 12/3000i? 22/3000i? 30/3000i? 40/3000i? 額定功率/kw 額定力矩/Nm? 1 2 4 8 12 22 30 38 最高轉(zhuǎn)速/ minr 5000 5000 4000 3000 3000 3000 3000 3000 23 （ 2）計(jì)算階躍加速力矩。 220 ( 2 1 .4 3 1 1 .6 2 2 3 .2 8 ) 5 6 .3 3d r LJ J J J k g c m k g c m? ? ? ? ? ? ? ? ? 2 計(jì)算折算到電動(dòng)機(jī)軸上的負(fù)載力矩 （ 1）計(jì)算切削負(fù)載力矩 cT 。 340 8 10J D L??? 3 4 4 2 20 .7 8 1 0 ( 6 .6 3 ) 8 .2 1 1 .6 2k g c m k g c m?? ? ? ? ? ? ? ? （ 3）計(jì)算折算到電動(dòng)機(jī)軸上的移動(dòng)部件的轉(zhuǎn)動(dòng)慣量 LJ 。由式 ( 《數(shù)控技術(shù)課程設(shè)計(jì)》 248)得 42232dGK L? ?? 3 4 4 633 . 1 4 ( 3 4 . 3 1 0 ) 8 . 1 1 0