Hydrostatic siab

Hydrostatic - yog ib tug ntawm cov hydraulic seem kawm equilibrium lub xeev thiab lub kua siab generated nyob rau hauv cov kua thaum so nyob rau txawv chaw.

Hydrostatic siab - ib tug yuav tsum muaj tswvyim nyob rau hauv hydrostatics. Xav txog ib tug ntim ntawm ib tug arbitrary kua nyob rau hauv equilibrium. Hauv no volume qhia point A thiab peb faib nws nyob rau hauv ib nrab ntawm ib tug dav hlau dua los ntawm tus taw tes A. Nyob rau hauv no dav hlau feem cais tawm lub cheeb tsam S thiab qhov chaw nyob rau tus taw tes A. Cia peb tshem tawm ib tug ib nrab ntawm lub ntim thiab hloov tus quab yuam uas nws tau ua nyob rau hauv cov seem npaum li cas, lub counterbalancing quab yuam F. Yog li, lub kua nyob rau hauv lub thib ob ib nrab yuav txuas ntxiv mus hauv so.

Peb tam sim no pib los txo cov cheeb tsam S thiaj li mus tas li taw tes A yog hauv nws. Nrog txaus yuav txo tau ntawm taw tes A coincides nrog lub cheeb tsam S. Thiab lub siab ntawm taw tes A yuav tsum tau txiav txim los ntawm cov mis P (A) = Lim Df / DS thaum DS nyhav pes tsawg.

Ces lub siab nyob rau S platform, yuav tsum sib npaug zos rau cov nqi ntawm cov siab sib sib zog tsa rau tag nrho cov ntsiab lus teej tug mus rau ntawm qhov chaw. Uas yog, nyob rau hauv lwm yam lus: p = F / S. Hydrostatic siab - ib tug muaj nuj nqis sib npaug zos rau cov quotient ntawm tus quab yuam F nyob rau cheeb tsam S.

Yog vim li cas rau lub hydrostatic siab yog tus luj ntawm cov kua thiab lub siab uas yog thov mus rau lub kua nto. Yog li, lub siab tshwm sim los ntawm tus luj ntawm lub kua thiab cov sab nraud siab - hom hydrostatic siab. Yog hais tias cov kua yog muab tso rau hauv lub piston thiab pheev ib tug quab yuam rau nws, ces, ntawm chav kawm, nyob rau hauv cov kua siab sawv. Nyob rau hauv tej yam kev mob, atmospheric siab presses lub kua. Yog hais tias lub siab nyob rau hauv cov kua nto hauv qab no atmospheric siab, lub siab yog hu ua koob qhia hais tias.

Lub kua yog nyob rau hauv nruab nrab yog tag nrho cov siab rog kuj nyob rau ntawm tej sufficiently me me volume ntawm cov kua, yog kuas nrog txhua lwm yam.

Xav txog closer hydrostatic siab thiab nws cov khoom:

• Rau tej taw tes, arbitrarily coj nyob rau hauv ib cov kua vector hydrostatic siab qhia inwardly ntawm nws volume thiab yog perpendicular mus rau lub site xaiv nyob rau hauv lub screen.

Cia peb ua pov thawj cov cuab yeej no: qhia rau peb xav hais tias lub kaum sab xis ntawm uas tus dag zog yuam yog thov kom muaj ib yam cheeb tsam, tsis yog ib tug ncaj kab. Peb sawv cev tus quab yuam P raws li P (li qub), P (tangent). Cia peb xav hais tias cov tangential tivthaiv yog tsis pes tsawg, ces nyob rau hauv nws cov cawv cov kua yuav tsum ntws cia ib inclined, tab sis nws yog thaum so ntawm tus taw tes. Li no lub xaus hais tias lub tangent yog sib npaug zos rau xoom thiab lub siab nyhuv tshwm sim perpendicular site. Cov cuab yeej yog muaj pov thawj.

• Lub magnitude ntawm lub hydrostatic siab yog tib yam nyob rau hauv tag nrho cov lus qhia.

Cia peb ua pov thawj cov cuab yeej no hydrostatic siab: xaiv ib tug arbitrary screen kua tetrahedron, ob tug uas coincide nrog lub dav hlau tswj dav hlau, thiab lub thib peb yog xaiv arbitrarily. Lub hauv paus tau ib txoj cai daim duab peb sab. Qhov kev txiav txim ntawm cov kua rau txhua lub ntsej muag denote: X * (P), Y * (P), Z * (P) muab cia rau hauv lub kua equilibrium, yog li ntawd tag nrho cov tshwm sim ntawm cov kev txiav txim ntawm rog yog 0.

E * (x) = 0

X * (P) dz -E * (P) de txhaum ib = 0,

E * (y) = 0, E * (z) = 0

Z * (P) dx -E * (P) de cos ib = 0

nws yog pom tseeb tias dz = de txhaum ib, dx = de cos ib tug

li no: X * (P) = E * (P), Z * (P) = E * (P)

tso zis: X * (P) = Y * (P) = Z * (P) = E * (P)

Cov cuab yeej yog muaj pov thawj. Txij li thaum lub kab twb xaiv arbitrarily, qhov no koob pheej ntawm lawv yog siv tau rau txhua lub sijhawm.

• Lub hydrostatic siab yog ncaj qha xwm yeem mus rau qhov tob. Nrog ua tob point siab nws yuav ua rau kom, thiab ib tug txo nyob rau hauv lub tob ntawm immersion - nce.

Tej kua taw tes, nyob rau hauv nruab nrab raws li nram qab no kab zauv: j + p / g = j (o) + p (o) / g = H, qhov twg j - tswj ntawm ib tug muab point, j (O) - coordinate ntawm tus nto ntawm cov kua, p, thiab p (o) - rau qhov siab ntawm cov ncej, g - lub kua tej lub ntiajteb txawj nqus, H - hydrohead.

Raws li ib tug tshwm sim ntawm transformations peb tau: r = p () + g [j (0) -j] los yog p = p (o) + GH

qhov twg h - lub tob ntawm immersion ntawm ib tug muab point, thiab GH - tsis tsuas tus luj ntawm lub sab ntawm kua sib npaug zos rau qhov siab qhov h thiab muaj nyob rau hauv lub cheeb tsam ntawm lub hauv paus unit. Qhov no tej khoom vaj tse yog ib lub npe ntawm lub hydrostatic siab ntawm Pascal txoj Kevcai.