Ib qho kev txhawb nqa yeeb nkab yog ib qho khoom siv uas siv los txhawb saum toj no - cov kav dej hauv av. Hom muaj xws li kev txhawb nqa ruaj khov, kev txhawb nqa zawv zawg, kev taw qhia kev txhawb nqa, thiab kev txhawb nqa yob.
Cov yeeb nkab txhawb nqa-tseem hu ua cov yeeb nkab so lossis cov yeeb nkab mounts- yog siv rau qhov twg cov kav dej tau nruab. Ua haujlwm raws li kev txhawb nqa rau cov raj xa dej, lawv tau muab faib ua cov khoom ruaj khov thiab txav tau raws li cov yam ntxwv ntawm kev ua haujlwm thiab cov txheej txheem tsim. Cov kev txhawb nqa ruaj khov yog ntsia ntawm cov ntsiab lus thauj tog rau nkoj uas tsis muaj kev cuam tshuam ntawm cov yeeb nkab thiab kev txhawb nqa tau tso cai; Cov kev txhawb nqa no yuav tsum muaj qhov rigidity txaus kom txhua qhov deformation uas tshwm sim los ntawm kev siv cov loads yog negligible piv rau deformation ntawm lub raj xa dej expansion pob qij txha. Movable kev txhawb nqa yog siv rau cov ntsiab lus txhawb nruab nrab, tso cai rau kev sib txawv ntawm cov yeeb nkab thiab kev txhawb nqa yam tsis muaj kev txwv cov yeeb nkab thermal expansion.
