Actuators (Fluid Based)

Question 1

What are the types of Drives?

Answer 1

• Electric
  -Fluid Based (Hydraulic/Pneumatic)
  -Thermodynamic

Question 2

What is the task of a fluid power system?

Answer 2

Do energy conversion:
-Pressure into Force or Voltaje
-Volume into Speed or Current

Question 3

What do we need in a fluid power system?

Answer 3

-Input: mechanical power (eq. Torque and angular speed, could also be a pump or motor)
-Conversion: to get pressure (p) and volume flow raid (Q)
-[We also need energy control, we normally use valves]
-Modification: p_2Q_2
-Conversion: to mechanical world again (to be able to use it)

Question 4

What does an Active suppression system do?

Answer 4

Bring energy into the system to counterattack the forces outside

Question 5

What are the properties of an ideal fluid?

Answer 5

-Non compressible
-No Viscosity nor friction
-No mass or density

Question 6

What is the equivalence to 1Pa?

Answer 6

1 N/m^2

Question 7

What is the equivalence to 1bar?

Answer 7

10^5 N/m^2

Question 8

What is the formula of the Volume flow?

Answer 8

Q= dV/dt

Question 9

What is the unit of the Volume flow?

Answer 9

m^3/s ; l/min

Question 10

How many liters are in 1m^3?

Answer 10

1000 l

Question 11

How many l/min are in a m^3/s?

Answer 11

60 000 l/min

Question 12

What’s the equation of the conservation of volume flow?

Answer 12

Q=V_1A_1 != Q_2=V_2A_2

Question 13

Expressions of Power… (watts)

Answer 13

-P=F(Velocidad)
-P=(Torque[M])w
-P=p*Q
-P=VI

Question 14

What’s the conservation of energy of a moving fluid?

Answer 14

The total energy of a moving fluid remains constant unless energy is put into the system or taken out. The total energy of a moving fluid consists of potential, kinetic and pressure based energy parts.

Question 15

What are the parts of Bernoulli principle?

Answer 15

[rhogh (potencial energy)] + [p (static pressure)] + [rho/2 *v^2 (kinetic energy)]