Dhululubo, meesha dhululubo The

Dhululubada ah (oo ka soo jeeda Greek, oo erayada "rullaluistemadka", "rullaluistemadka") - jirka ah joomateri oo waxaa lagu qeexaa by dusha ka baxsan yeedhay cylindrical, iyo laba diyaaradood. diyaarado Kuwani midaysan qaab dushiisa oo waa isku midka ah midba midka kale.

dusha A cylindrical - dusha a in la helo mooshin translational xariiq toosan ee bannaan. dhaqdhaqaaqa Kuwani waa sida in barta la doortay ee line toosan ka dhigaysa dhaqdhaqaaqa weheliyaan qalooca nooca guri. Tani line toos ah waxaa loo yaqaan matoor, laakiin qalooca ah - hagaha.

dhululubo wuxuu ka kooban yahay labo ka mid ah saldhigyadii iyo dusha sare cylindrical lateral. Dhululubada iman dhowr qaab:

1. Wareegtada, dhululubo si toos ah. At saldhig of dhululubo iyo dadab iyo in ay generatrix line hago, iyo leedahay dhidibka ah dhabanada.

2. dhululubo The dhiiran. xagal Waxa u dhexeeya line dhalin iyo dhulka ma aha mid sahlan.

3. dhululubada ah nooc ka mid ah. Hyperbolic, elliptic, saxan, iyo kuwa kale.

Meesha of dhululubo ah, iyo degaanka dusha guud ee dhululubo kasta waxaa laga helaa oo ay ku daray goobaha ka mid ah saldhigyada ka mid ah tirada iyo goobta dhinaca dusha sare.

formula in xisaabi aagga guud ee dhululubo ee wareeg ah, dhululubo si toos ah:

SP = Rh + 2n 2n 2n Red2 = R (h + R).

aagga lateral dusha loo raadinayo wax yar ka adag yihiin aagga oo dhan of dhululubo yahay, waxaa loo xisaabiyaa by tarmo dhererka line abuurayo ee wareega ee qaybta cross la aasaasay by diyaarad taas oo dadab iyo in ay line generatrix ah.

Goobtani waxa ay dusha si dhululubo wareeg ah, dhululubo xaq u aqoonsan by scan ee shayga.

Iskaan - leydi in uu leeyahay h height a iyo P dherer ah, kaasoo u dhigma wareega salka.

Taas oo muujinaysa in meesha lateral dhululubo waa loo siman yahay si ay meesha iskaanka iyo loo xisaabin karaa by formula this:

SB = Ph.

Haddii aad qaadato wareeg ah, dhululubo toos ah, ka dibna isaga for:

P = 2n R, iyo SB = 2n Rh.

Haddii dhululubo ku dhiiran tahay, degaanka ee dusha dhanka waa loo siman yahay si wax soo saarka ee dhererka khadadka matoor iyo qaybta cross ee wareega taas oo dadab iyo in ay line dhalin this.

Nasiib darro, ma jiraan wax formula fudud muujiyaan aagga of dusha lateral of dhululubo ku dhiiran tahay iyada oo sarajooggeeduna iyo xuduudaha ee salkeeda.

Si loo xisaabiyo degaanka ee qaybta dhululubo ah, waa in aad ogaato a xaqiiqooyin tiro yar. Haddii qaybta cross saldhigga diyaarad ay soo gudubtaa, ku-section cross had iyo jeer waa leydi. Laakiin laydiga waxay noqon doontaa kala duwan, taas oo ku xidhan booska qaybta. Mid ka mid ah dhinaca of qaybta axial ah tiradaasi, taas oo dadab iyo in ay salka loo siman yahay si height ah, iyo kuwa kale oo - dhexroor ee salka dhululubo ah. goobta A qeybaha sida, siday u kala horreeyaan, uyeelaysaan kuwo wax soo saarka ee hal dhinac oo leydiga kale, dadab iyo in ay ugu horeysay, ama wax soo saarka ee height of tiradaasi in dhexroorka of salkeeda.

Haddii qaybta cross waa dadab iyo in ay tiradaasi salka, laakiin ma aha iyada oo dhidibka wareeg mari doona, degaanka ee qaybtan waxay noqon doontaa si siman u sheyga dhaadheer oo dhululubo ah, iyo gooye qaarkood. Si aad u hesho gooye ah, waxaa lagama maarmaan ah si ay u dhisaan goobo hoose ee gacan dhululubo ah si uu u qabto oo iska dhaqaaqo, taas oo ah aragti qeybaha. Oo ka this aad u baahan tahay dadab ah in ay gacan ka isgoyska la goobada. dhibcood isgoyska ku xiran yihiin xarunta. saldhig A ee saddexagalka - waa loo baahan yahay gooye, dhererka kaas oo la raadinayo Aragtida ku Theorem. Aragtida The Theorem waa: "wadarta ah ee god oo ka mid ah labada lugood waa loo siman yahay si shakaal afar gees":

C2 = A2 + B2.

Haddii qaybta wax saameyn ah kuma salka ku dhululubo iyo dhululubo laftiisa, oo meeriskeeduna wuxuu wareeg ah, aagga of this iskutallaabta qaybta waxaa laga helaa sida aagga of goobada.

Bedka goobada waa loo siman yahay si:

S env. 2n = Red2.

Si aad u hesho ku gacan goobada R, waxaa lagama maarmaan ah in dhererka 2n C qaybsado:

R = C 2n \, halkaas oo n - pi, joogto ah xisaabta loo xisaabaa xogta iyo circumferentially siman 3.14.