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9、APPL IED M ECHAN ICS V o. l 22 Torsio n inSpot -W elded Thin W ailed Box w ith V aryi ng Section P eiX in gzhu 1 R en Zhe ngqua n 2Z hang L i 1 ( S chool of C ivil Engin eeri ng and M ech an ics , X ia n Jiaot ong U n iversity,X ia n 710049 , Ch in a 1 ( C ollege of S cien ce and Eng in eeri ng, Y a

10、nb ian U n iversity ,Y an ji 133002, Ch ina 2 Abstract : A m ethod to an alyze tors ion perfor m ances in a spot weld ed thin-w alled box is proposed , where th e cross sect ion varies slow ly along the longitud ina l d irect ion. W arp ing tors ions for tw o situatio ns, eve n and un eve n pitch o

11、f spotw elds, are d iscussed . It is con cluded that torsi on rig id ity is w eake ned as the beam length in creases , whose de creas ing rate is n early equal to one o f unifor m sect ion ; thebeam w ith vary ing sect ion keeps a certa in rig idity w ith fe w er w eldi ng spots and low ercos. t If

12、the we ld ed spot pitch p 2, i n the rig h, t variesw ith in 25 % of the pitch p 1 in theleft , the sheari ng force transm issi on n early unv aries. T he si m u latio n results co in cidethe experi m ental ones very w el.l Keywords: varying secti on, spot-w elded thinw alled boxsecti on beam, w arp

13、 ing torsi on, w elded spo t p itch. Chaotic Identification toW eak Signalsof Automobile L i X iang lian ( Phys ics Exp eri m en t Cen ter , N an jing U n iversity of A eronaut ics and A s tronau tics , N an jing, 210016 Abstract : T he chaot ic osc illator is va lu ableMl UM fliH !4* -10! iH*for w

14、eak signa l detect io n , The corresp ond ing theory is in troduced and th e adapt iv e adju stm ent m ethod conjo in ed the a m plitude w ith freque ncy is e m p lo yed to ide nt ify thew eak sig na ls . The si m ulat ion analysis w ith chaotic detectio n for w eak period ic sig nalssubm erged in v

15、 io lent no ise is carried ou. t For a cracked flywheel shell in au tom obile , thereal w eak v ib rati on sig nal id en tificatio n is ach ieved . A com paris on w ith the co rre lativ e stud ie s ind icates the valid ity of th is m ethod in autom ob ile part fau lt an alysis .Keywords: chaos , w e

16、ak sig nal, vibra tion, id entif ication, detection. Three -D i m ensionalH eat Tran sfer An alysis to H ybrid M ultilayer Co m posite Structure Chang X iaoqua nZheng Gang tie ( S chool of astronau t ics , B eijing U n iv . of A eron aut ics and A stronautics , B eiji ng 100083 , Ch ina Abstract : T

17、 he hybrid m ultilayer com posite structures consist o f la yers w ith different ther m a l conductiv ity and con st itutive constants . T o ana lyze the in ternal heat transferm echan ism and the therm o -e lastic characterist ics o f the hybrid structure , three -di m ensional m odels are required

18、 to get the m ore accurate resu lts .U tilized the equ iv a lent e le m ent based on th ree -d i m ensional heat transfer th eory andGa lik in f in ite e lem en t m eth ods fo r heat conduction , the resu lts w ith higher accuracyand less com putat io n are ach ie ved . T he d ifficulty due to th in er sing le layer is so lv edby in troduc ing the con cept of equ iv ale n