Ntawm ntau yam khoom siv hauv engineering, cov khoom siv hlau yog maj mam dhau los ua cov ntaub ntawv tseem ceeb thiab kev ua haujlwm vim lawv cov khoom zoo heev hauv ntau yam xws li kev siv tshuab thiab cov txheej txheem. Rau cov khoom siv sib xyaw, qhov feem ntau suav hais tias yog cov qauv tsis xws luag, thiab lawv feem ntau dhau los ua qhov chaw ntawm kev tawg thiab nthuav dav, ua rau muaj kev cuam tshuam lossis cuam tshuam rau cov khoom siv. Txawm li cas los xij, thaum tus naj npawb ntawm qhov hauv cov khoom nce mus rau ib qho kev faib tawm thiab tsis tu ncua, qhov muaj nyob ntawm cov qhov no yuav ua rau cov khoom muaj qee qhov tshwj xeeb, yog li tsim cov khoom siv tshiab, uas yog hu ua cov khoom ntxeem tau. Cov khoom siv ntxeem tau tam sim no suav nrog cov yas ntxeem tau, ntxeem tau ceramics, porous hlau thiab lwm yam. Nws feem ntau ntseeg tias thaum lub porosity ntawm cov ntaub ntawv ntxeem tau yog 40% 98%, lawv tuaj yeem hu ua cov ntaub ntawv ua npuas dej. Ua npuas ncauj hlau yog ib ceg ntawm cov khoom ua npuas ncauj, thiab nws cov qauv muaj cov yam ntxwv hauv qab no: qhov pore loj dua, porosity dua, sib dua qhov sib zog nqus, qhov loj dua qhov chaw, thiab cov khoom tseem ceeb ntawm cov pob txha mesh yog hlau.

Aluminium ua npuas ncauj yog siv dav siv ua npuas ncauj hlau, uas yog tsim los ntawm cov pob txha pob txha thiab qhov pores, thiab yog cov khoom siv ua haujlwm tshiab tsim nyob rau hauv xyoo tsis ntev los no. Raws li cov khoom siv, nws muaj cov yam ntxwv ntawm lub teeb yuag thiab lub zog tshwj xeeb: raws li cov khoom siv ua haujlwm, nws muaj ntau yam khoom siv lub cev xws li ntxeem tau, kev co damping, damping, suab absorption, tshav kub dissipation, cuam tshuam lub zog nqus thiab electromagnetic shielding.
Txawm hais tias daim ntawv thov ntau yam ntawm cov khoom siv txhuas ua npuas ncauj yog dav, tab sis feem ntau tsom rau ntawm daim ntawv thov ntawm nws cov khoom ua haujlwm, thiab ua si cov khoom ua haujlwm ntawm txhuas ua npuas ncauj yog feem ntau ntawm cov nqi ntawm nws cov khoom siv tshuab. Yuav ua li cas muab kev ua si rau cov khoom ua haujlwm ntawm txhuas ua npuas ncauj thiab muaj peev xwm tswj tau cov qauv ntawm cov khoom siv kho tshuab zoo tau yog cov kev tshawb fawb nrov, cov kev daws teeb meem tam sim no yog txhuas ua npuas ncauj - cov khoom siv hlau sib xyaw - xws li "sandwich" aluminium foam, yog lub zog. ntawm cov hlau rau txheej txheej, aluminium ua npuas ncauj rau cov tub ntxhais txheej ntawm sandwich vaj huam sib luag qauv. Lub ntsiab txhais tau tias ntawm kev tsim aluminium ua npuas ncauj sandwich panels, composite panels suav nrog kev sib txuas thiab vuam.