Sidee loo Xisaabiyaa Madaxa Bamka?
Doorkeena muhiimka ah ee aan ka qaadanno soosaarayaasha bamka haydarooliga, waxaan ka warqabnaa tirada badan ee doorsoomayaasha u baahan in la tixgeliyo marka la dooranayo bamka saxda ah ee loogu talagalay codsiga gaarka ah. Ujeeddada maqaalkan ugu horreeya waa in la bilaabo iftiiminta tirada badan ee tilmaamayaasha farsamada ee ku jira caalamka bamka haydarooliga, laga bilaabo halbeegga "madaxa bamka".
Waa maxay Madaxa Bamka?
Madaxa bamka, oo badanaa loo yaqaan madaxa guud ama madaxa firfircoonida guud (TDH), wuxuu matalaa tamarta guud ee la siiyo dareeraha uu bamku bixiyo. Waxay cabbirtaa isku-darka tamarta cadaadiska iyo tamarta dhaqdhaqaaqa ee bamku siiyo dareeraha marka uu dhex socdo nidaamka. Marka la soo koobo, waxaan sidoo kale ku qeexi karnaa madaxa dhererka ugu badan ee kor u qaadista ee bamku awood u leeyahay inuu u gudbiyo dareeraha la bamgareeyay. Tusaalaha ugu cad waa kan tuubo toosan oo si toos ah uga soo baxaysa meesha la keenayo. Dareeraha waxaa laga soo dejin doonaa tuubada 5 mitir laga bilaabo meesha laga sii daayo iyadoo la adeegsanayo bambo madaxeedu yahay 5 mitir. Madaxa bamka si liddi ku ah ayaa loola xiriiriyaa heerka socodka. Inta uu sareeyo heerka socodka bamka, ayuu madaxa hoos u dhacaa. Fahmidda madaxa bamka waa lama huraan sababtoo ah waxay ka caawisaa injineerada inay qiimeeyaan waxqabadka bamka, inay doortaan bamka saxda ah ee loogu talagalay codsi la bixiyay, iyo inay naqshadeeyaan nidaamyada gaadiidka dareeraha ee hufan.
Qaybaha Madaxa Bamka
Si loo fahmo xisaabinta madaxa bamka, waa muhiim in la kala saaro qaybaha ka qayb qaadanaya guud ahaan madaxa:
Madaxa Joogtada ah (Hs)Madaxa taagan waa masaafada toosan ee u dhaxaysa meelaha nuugista bamka iyo meelaha nuugista. Waxay ka dhigan tahay isbeddelka tamarta ee suurtagalka ah ee ka dhasha kor u kaca. Haddii barta nuugista ay ka sarreyso barta nuugista, madaxa taagan waa togan yahay, haddii uu ka hooseeyona, madaxa taagan waa taban.
Madaxa Xawaaraha (Hv)Madaxa xawaaraha waa tamarta dhaqdhaqaaqa ee dareeraha la siiyo marka uu dhex socdo tuubooyinka. Waxay ku xiran tahay xawaaraha dareeraha waxaana lagu xisaabiyaa iyadoo la adeegsanayo isle'egta:
Hv=V^2/2g
Halkee:
- Hv= Madaxa xawaaraha (mitir)
- V= Xawaaraha dareeraha (m/s)
- g= Dardar-gelin ay sabab u tahay cufis-jiidadka (9.81 m/s²)
Madaxa Cadaadiska (Hp)Madaxa cadaadiska wuxuu matalaa tamarta lagu daray dareeraha ee bamka si looga gudbo khasaaraha cadaadiska ee nidaamka. Waxaa lagu xisaabin karaa iyadoo la adeegsanayo isla'egta Bernoulli:
Hp=Pd−Ps/ρg
Halkee:
- Hp= Madaxa cadaadiska (mitir)
- Pd= Cadaadiska meesha laga saarayo (Pa)
- Ps= Cadaadiska meesha nuugista (Pa)
- ρ= Cufnaanta dareeraha (kg/m³)
- g= Dardar-gelin ay sabab u tahay cufis-jiidadka (9.81 m/s²)
Madaxa Isku-dhafka (Hf)Madaxa is-qabsiga ayaa mas'uul ka ah khasaaraha tamarta ee ka dhasha is-qabsiga tuubooyinka iyo qalabka ku rakiban nidaamka. Waxaa lagu xisaabin karaa iyadoo la adeegsanayo isle'egta Darcy-Weisbach:
Hf=fLQ^2/D^2g
Halkee:
- Hf= Madaxa is jiidjiidka (mitir)
- f= Arrinta isku dhaca Darcy (cabir la'aan)
- L= Dhererka tuubada (mitir)
- Q= Heerka socodka (m³/s)
- D= Dhexroorka tuubada (mitir)
- g= Dardar-gelin ay sabab u tahay cufis-jiidadka (9.81 m/s²)
Wadarta Isleegta Madaxa
Madaxa guud (H) nidaamka bamka waa wadarta dhammaan qaybahan:
H=Hs+Hv+Hp+Hf
Fahmidda isla'egtan waxay u oggolaanaysaa injineerada inay naqshadeeyaan nidaamyada bamka ee hufan iyagoo tixgelinaya arrimo ay ka mid yihiin heerka socodka loo baahan yahay, cabbirka tuubooyinka, kala duwanaanshaha kor u kaca, iyo shuruudaha cadaadiska.
Adeegsiga Xisaabinta Madaxa Bamka
Xulashada Bamka: Injineeradu waxay adeegsadaan xisaabinta madaxa bamka si ay u doortaan bamka ku habboon codsi gaar ah. Iyagoo go'aaminaya madaxa guud ee loo baahan yahay, waxay dooran karaan bamka buuxin kara shuruudahan si hufan.
Naqshadeynta Nidaamka: Xisaabinta madaxa bamka ayaa muhiim u ah naqshadeynta nidaamyada gaadiidka dareeraha. Injineeradu waxay cabbiri karaan tuubooyinka waxayna dooran karaan qalab ku habboon si loo yareeyo khasaaraha is-jiidjiidka iyo in la kordhiyo waxtarka nidaamka.
Waxtarka Tamarta: Fahmidda madaxa bamka waxay ka caawisaa hagaajinta hawlgalka bamka si loo helo hufnaan tamar. Iyagoo yareynaya madaxa aan loo baahnayn, injineeradu waxay yareyn karaan isticmaalka tamarta iyo kharashyada hawlgalka.
Dayactirka iyo Xal u helidda Dhibaatooyinka: La socodka madaxa bamka waqti ka dib waxay kaa caawin kartaa inaad ogaato isbeddellada ku yimaada waxqabadka nidaamka, taasoo muujinaysa baahida loo qabo dayactirka ama xalinta dhibaatooyinka sida xannibaadaha ama daadashada.
Tusaale Xisaabin: Go'aaminta Wadarta Madaxa Bamka
Si aan u sharaxno fikradda xisaabinta madaxa bamka, aan tixgelinno xaalad fudud oo ku lug leh bamka biyaha ee loo isticmaalo waraabka. Xaaladdan, waxaan rabnaa inaan go'aamino madaxa bamka ee loo baahan yahay si loo helo qaybinta biyaha ee hufan laga bilaabo kaydka ilaa beerta.
Cabbirrada la bixiyay:
Farqiga Sare u qaadista (ΔH): Masaafada toosan ee u dhaxaysa heerka biyaha ee kaydka ilaa meesha ugu sarreysa ee goobta waraabka waa 20 mitir.
Lumis Madax-xanuun (hf): Khasaaraha is-jiidjiid ee ka dhasha tuubooyinka, qalabka, iyo qaybaha kale ee nidaamka ayaa gaaraya 5 mitir.
Madaxa Xawaaraha (hv): Si loo ilaaliyo socodka joogtada ah, waxaa loo baahan yahay madax xawaare gaar ah oo 2 mitir ah.
Madaxa Cadaadiska (hp): Madaxa cadaadiska dheeraadka ah, sida in laga gudbo qalabka xakamaynta cadaadiska, waa 3 mitir.
Xisaabinta:
Wadarta guud ee madaxa bamka (H) ee loo baahan yahay waxaa lagu xisaabin karaa iyadoo la adeegsanayo isla'egta soo socota:
Wadarta Madaxa Bamka (H) = Farqiga Sare/Madaxa Joogtada ah (ΔH)/(hs) + Lumis Madax oo Kala Duwan (hf) + Madax Xawaaraha (hv) + Madax Cadaadis (hp)
H = 20 mitir + 5 mitir + 2 mitir + 3 mitir
H = 30 mitir
Tusaalahan, madaxa guud ee bamka looga baahan yahay nidaamka waraabka waa 30 mitir. Taas macnaheedu waa in bamku uu awood u leeyahay inuu bixiyo tamar ku filan si uu biyaha u qaado 20 mitir oo toosan, uga gudbo khasaaraha is jiidjiidka, u ilaaliyo xawaare gaar ah, iyo inuu bixiyo cadaadis dheeraad ah marka loo baahdo.
Fahmidda iyo si sax ah u xisaabinta madaxa guud ee bamka ayaa muhiim u ah doorashada bamka cabbirka ku habboon si loo gaaro heerka socodka la rabo ee madaxa u dhigma ee ka dhasha.
Halkee ayaan ka heli karaa sawirka madaxa bamka?
Tilmaamaha madaxa bamka ayaa jira waxaana laga heli karaa gudahaxaashiyaha xogtadhammaan alaabtayada ugu muhiimsan. Si aad u hesho macluumaad dheeraad ah oo ku saabsan xogta farsamo ee bamamkeena, fadlan la xiriir kooxda farsamada iyo iibka.
Waqtiga boostada: Sebteembar-02-2024