Lub raj plaub fab VS lub raj plaub fab, lub duab twg ruaj khov dua?
Qhov sib txawv ntawm kev ua tau zoo ntawmlub raj plaub fabthiablub raj plaub fabHauv kev siv engineering yuav tsum tau soj ntsuam kom meej los ntawm ntau qhov kev xav txog mechanical xws li lub zog, kev nruj, kev ruaj khov, thiab kev muaj peev xwm bearing.
1. Lub zog (kev khoov thiab kev tiv thaiv torsion)
Lub zog khoov:
Lub raj plaub fab: Thaum raug kev thauj khoom khoov raws li sab ntev (qhov siab), lub sijhawm inertia ntawm seem loj dua, thiab qhov tsis kam khoov zoo dua li ntawm lub raj plaub fab.
Piv txwv li, lub zog khoov ntawm 100 × 50 hli lub raj duab plaub fab hauv qhov kev taw qhia ntev yog siab dua li ntawm 75 × 75 hli lub raj plaub fab.
Lub raj plaub fab: Lub sijhawm inertia yog tib yam hauv txhua qhov kev taw qhia, thiab qhov kev ua haujlwm khoov yog symmetrical, tab sis nws tus nqi feem ntau yog me dua li ntawm qhov kev taw qhia ntev ntawm lub raj plaub fab hauv qab tib thaj chaw hla.
Xaus lus: Yog tias qhov kev taw qhia ntawm lub nra hnyav meej (xws li cov qauv ntawm lub nqaj), lub raj plaub fab zoo dua; yog tias qhov kev taw qhia ntawm lub nra hnyav hloov pauv, lub raj plaub fab sib npaug dua.
Lub zog torsion:
Lub torsion tsis tu ncua ntawm lub raj square yog siab dua, qhov kev faib tawm ntawm torsion yog sib npaug ntau dua, thiab qhov tsis kam torsion zoo dua li ntawm lub raj rectangular. Piv txwv li, qhov tsis kam torsion ntawm 75 × 75mm square raj yog muaj zog dua li ntawm 100 × 50mm rectangular raj.
Xaus lus: Thaum lub nra hnyav torsional yog qhov tseem ceeb (xws li lub ncej kis), cov raj square zoo dua.
2. Kev tawv (muaj peev xwm tiv thaiv kev hloov pauv)
Kev khoov khov kho:
Qhov tawv yog proportional rau lub sijhawm ntawm inertia. Cov raj plaub fab muaj qhov tawv siab dua nyob rau sab ntev, uas yog qhov tsim nyog rau cov xwm txheej uas xav tau tiv taus qhov kev hloov pauv ib sab (xws li cov choj beams).
Cov raj plaub fab muaj qhov sib npaug ntawm ob sab thiab tsim nyog rau cov khoom thauj ntau txoj kev (xws li cov kem).
Xaus Lus: Qhov yuav tsum tau ua kom ruaj khov nyob ntawm qhov kev coj ntawm lub nra. Xaiv cov raj plaub fab rau cov khoom thauj ib sab; xaiv cov raj plaub fab rau cov khoom thauj ob sab.
3. Kev Ruaj Ntseg (kev tiv thaiv buckling)
Kev sib tsoo hauv zos:
Cov raj plaub fab feem ntau muaj qhov sib piv dav dua rau qhov tuab, thiab cov khoom nyias nyias yuav yooj yim rau kev khoov hauv zos, tshwj xeeb tshaj yog nyob rau hauv qhov hnyav nias lossis shear.
Cov raj plaub fab muaj kev ruaj khov zoo dua hauv zos vim lawv qhov kev sib tshuam sib luag.
Kev khoov tag nrho (Euler buckling):
Lub nra hnyav ntawm qhov khoov yog cuam tshuam nrog qhov tsawg kawg nkaus ntawm lub vojvoog ntawm kev sib hloov ntawm qhov seem. Lub vojvoog ntawm kev sib hloov ntawm cov raj plaub fab yog tib yam hauv txhua qhov kev taw qhia, thaum lub vojvoog ntawm kev sib hloov ntawm cov raj plaub fab hauv qhov kev taw qhia luv luv yog me dua, ua rau lawv yooj yim khoov.
Xaus Lus: Cov raj plaub fab yog qhov zoo dua rau cov khoom sib zog (xws li cov ncej); yog tias qhov kev taw qhia ntev ntawm lub raj plaub fab raug txwv, nws tuaj yeem raug them los ntawm kev tsim.
4. Muaj peev xwm nqa tau (axial thiab ua ke)
Kev sib zog ntawm axial:
Lub peev xwm dais tau yog cuam tshuam nrog thaj tsam hla thiab qhov sib piv ntawm qhov nyias. Hauv qab thaj tsam hla tib yam, cov raj plaub fab muaj peev xwm dais tau ntau dua vim lawv lub vojvoog tig loj dua.
Kev sib xyaw ua ke (kev sib xyaw ua ke ntawm kev sib zog thiab kev khoov):
Cov raj plaub fab tuaj yeem siv qhov zoo ntawm qhov kev teeb tsa zoo tshaj plaws thaum qhov kev taw qhia ntawm lub zog khoov yog qhov tseeb (xws li qhov thauj khoom ntsug ntawm sab ntev); cov raj plaub fab yog qhov tsim nyog rau ob txoj kev khoov lub zog.
5. Lwm yam tseem ceeb
Kev siv cov khoom siv:
Cov raj plaub fab zoo dua thiab txuag cov ntaub ntawv thaum raug kev khoov ib sab; cov raj plaub fab pheej yig dua nyob rau hauv ntau qhov kev thauj khoom.
Kev yooj yim ntawm kev sib txuas:
Vim yog qhov sib npaug ntawm cov raj plaub fab, kev sib txuas ntawm cov node (xws li kev vuam thiab bolts) yooj yim dua; cov raj plaub fab yuav tsum xav txog kev taw qhia.
Cov xwm txheej ntawm daim ntawv thov:
Cov raj plaub fab: cov nqaj tsev, cov caj npab crane, lub tsheb chassis (kev taw qhia meej).
Cov raj plaub fab: cov kem tsev, cov trusses chaw, cov thav duab kho tshuab (cov khoom thauj ntau txoj kev).
Lub sijhawm tshaj tawm: Tsib Hlis-28-2025
