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Efficiency and Power - Coggle Diagram
Efficiency and Power
Power
\( P_B \) - Diesel Engine
Brake Power
Measured at Crankshaft
Shop Test
\( P_S \)
Shaft Power
Measured aboard
close to propeller
\( P_i \) - Steam Engine
Indicated Power
\( P_E\) - Effective Power
\( P_E = RV \)
Power to overcome
resistance of motion
at certain velocity
Efetivamente preciso resistir
\( P_D \) - Power Delivered to Propeller
Potência entregue ao propeller
Potência no Disco
\(P_T\) - Thrust Work
\(P_T=TV_A\)
Trabalho pra andar
\(\dfrac{P_D}{P_S} \)
Power lost in transmission
Shaft Transmission Efficiency
Poder é um Eficiente Sistema Desenvolvedor de Traumas
Efficiency
Quasi-propulsive coefficient - \( \eta_D \)
\( \eta_D = \dfrac{P_E}{P_D} \)
Não Deu, me Pegaram Peidando
Useful power / Propeller power
\(\eta_D=\eta_H \times \eta_R \times \eta_0 \)
Propulsive Efficiency - \( \eta_P \)
Shaft X Quasi-propulsive
\(\eta_P= \eta_D \times \eta_S= \dfrac{P_E}{P_D} \times \dfrac{P_D}{P_S} \)
Não Pára. Nao Dá pra Não Socar
Open Water Efficiency - \(\eta_0 \)
\(\eta_0=\dfrac{TV_A}{2\pi nQ_0}\)
Te Vi Arrombada em cima de 2 Pica Não Quero
Efficiency Behind Hull - \( \eta_B \)
\(\eta_B=\dfrac{TV_A}{2\pi nQ}\)
Y
Relative Rotative Efficiency
\(\eta_R=\dfrac{\eta_B}{\eta_0} \)
Single Screw - 1,0 a 1,10
Twin Screws - 0,95 a 1,0
Eficiencia rodando uma maior que rodando 2
Atrás você Quer
Hull Efficiency - \(\eta_H\)
\(\eta_H=\dfrac{P_E}{P_T}\)
Useful power / Thrust Work
NuH, me Pegaram na Punheta
Shaft Transmission Efficiency - \( \eta_S \)
Não Sei se Peidei ou se Peidaste
\( \eta_S = \dfrac{P_D}{P_S} \)
Power Lost in Transmission
Horsepower
\( 1hp=0,7457 kW \)
\( 1hp=550ft.lb/s \)
