Simulation and Analysis of the Results

If we consider the complete model for energy analysis, we have two contributions on which power sensors have been placed (see previous sketch):

• : The power supplied by the pump;

• : The power supplied to the output tank (negative source);

On the other hand, we can sort the passive elements into four different groups:

• : Hydraulic Capacitive Powers (both jack chambers and the pipe);

• : Mechanical Inertial Power (kinetic energy variation of the jack mass);

• : Hydraulic Resistive Powers (four from the bridge and the jack leakage);

• : Mechanical Resistive Power (viscous friction work in the jack).

The power balance can be written:

Figure 22: Power Balance of the Hydraulic Wheatstone bridge model

We thus access a full view of the powers within this system. It gives information about the maximum magnitudes of powers as well as their evolution over time when the operating points change.

The use of the Bar Graphs from the Power, Energy, Activity window in the Power tab shows that all power contributions are mostly in the R elements. This can be observed for various times of simulation. Note that the INPUT Power is not represented in the Bar Graphs since its a source of power.

Figure 23: Powers [W] as Bar Graphs at t=4 s

At time = 4s, the maximal power is found to come from the mechanical friction of the hydraulic jack HJ001, being 104 [W].