Kev Siv Tshuab Khoos Phis Tawm (CAD) yog ib qho txheej txheem uas tso cai rau cov neeg siv computer tsim ntau yam khoom thiab cov duab geometric hauv on-screen, dua li tsim lawv los ntawm txhais tes. Siv CAD software, ib qho tuaj yeem tsim thiab kho qhov khoom kom txiav txim siab seb nws yuav tshwm sim thiab ua haujlwm li cas tom qab nws tsim. Cov duab CAD feem ntau suav nrog lub computer-tsim cov duab ntawm tus qauv, nrog rau nws qhov ntev, cov txheej txheem, thiab cov ntaub ntawv. Cov duab kos no yuav yog ob qho ntev (2D) lossis peb-seem (3D). Thaum ib qho khoom tau kos duab 3D siv CAD, cov txheej txheem feem ntau hu ua kev hloov pauv lossis qauv, thaum 2D tus qauv feem ntau hu ua "qauv sau."
Cov duab CAD tau siv rau hauv qhov ntau ntawm cov ntawv thov kev lag luam thiab kev tsim khoom. Cov thev naus laus zis no tau siv dav hauv kev tsim txuj ci thiab duab nraaj, thiab muab cov ua yeeb yam no ntau qib kev tsim qauv yooj yim dua li ntawm lwm cov khoom nruab nrab. Cov duab kos no tseem siv rau hauv kev tsim tsheb thiab cov dav hlau, ntxiv rau hauv kev txhim kho cov khoom lag luam thiab khoom siv. Ntau cov teebmeem tshwj xeeb uas siv hauv cov yeeb yaj kiab thiab TV tso siab rau lub koos pij tawj tsim tawm nrog CAD software. Thaum kawg, CAD cov duab kos yog qhov tseem ceeb ntawm kev tsim kho thiab kev tsim vaj tsev tshuab hluav taws xob.
Ua ntej kev tsim tawm ntawm CAD, cov khoom lag luam thiab cov phiaj xwm tsim tau kos los ntawm txhais tes. Qhov no yog qhov ua haujlwm tau siv zog thiab siv sijhawm ntau uas yuav tsum muaj cov kws sau ntawv siab, nrog rau kev hloov kho ntau zaus. Nrog kev nthuav qhia ntawm CAD software, cov kws tsim qauv thiab cov kws tsim qauv tsim kho tau sai thiab yooj yim tsim thiab kho cov duab kos. Cov chaw tsim qauv yuav ntiav cov neeg ua haujlwm tsawg dua, thiab ob qho kev tsim qauv thiab kev tsim kho cov khoom lag luam tau raug txo ntau heev. CAD software tseem tso cai rau cov kws tsim qauv thiab cov kws tsim qauv los tsim lawv cov duab kos, tsis yog sim piav qhia rau tus kws kos duab, ua rau tus qauv tsim muaj tseeb dua.
Txawm hais tias CAD cov duab kos tau siv txij li xyoo 1960, nws tsis tau' t kom txog rau thaum xyoo 1980s thiab thaum ntxov xyoo 1990 uas CAD software tau dhau los ua tus xaiv tsim nyog rau ntau qhov kev lag luam. Cov qauv software thaum ntxov tso siab rau 2D vector tsim, thaum kos duab CAD niaj hnub suav nrog kev ua qauv 3D. Niaj hnub no' s tus qauv software tso cai rau cov neeg tsim qauv tsis tsuas yog kos ib qho khoom, tab sis kom tig nws ntawm lub axis, thiab kom pom los ntawm cov khoom' s phab ntsa los ntawm sab hauv. Cov qauv no muaj peev xwm tshwj xeeb hauv kev tsim kho thiab txua tshuab, ua rau cov neeg tsim qauv zoo siv "taug kev-dhau ntawm" tus qauv thiab tshawb xyuas cov ces kaum sib txawv.
CAD software feem ntau yog tsim rau lub Windows lossis Linux operating systems. Cov duab CAD nyuaj yuav tsum muaj cov ntawv qib siab ua ntej thiab muaj qib siab ntawm lub cim xeeb (RAM), tab sis cov duab kos tau yooj yim tuaj yeem ua rau yuav luag txhua lub computer pib. CAD software tau ua haujlwm siv tus nas ib txwm, txawm tias qee tus qauv tsim qauv yuav ntxiv cov haujlwm no siv cov cwj mem digital lossis kos duab ntsiav tshuaj.
