Hyrdaulic Systems Simulation Tool

 Contents

 

 

Model example

 

The file ‘Hydraulic_System_example’ contains a model created with the blocks of HSST Library. This example shows how the blocks are connected and how the flow signals lines shall be summed. To reduce the window dimensions and to improve the model comprehensibility, the blocks are closed in three subsystems: one of them contains the hydraulic module (the pump, the accumulator, the reservoir and the relief valve used as safety valve), each of the others contains one actuation system composed by a valve, an actuator and a controller. It must be noted that the name of the hydraulic module subsystem starts with the digit 1 (1_Hydraulic_Block). As explained in paragraph 7.1, it is mandatory that the pump block name begin with the number 1 (‘1 Fixed displacement Pump’) and that, as in this model, if the pump block is closed inside a subsystem, also the subsystem name start with the number 1. If this rule is not applied, an error can arise. To verify this, it is possible to delete the number 1 from the name of the Hydraulic_Block and add 1 at the beginning of one of the two subsystems; then write ‘clear all’ on the MATLAB window and start the simulation.

At the first simulation run of a model like this one, it is convenient to operate as described in the following:

  1. open the ‘Initial Conditions’ block (see paragraph 5) and set ‘Start from Uninitialised Conditions’, select ‘Save Current States to File’ and assign a suitable name to the ‘Final States File Name’.
  2. Run the simulation without actuation command, and eventually without external load, until the reservoir reaches the nominal pressure and then stop the simulation
  3. Open again the ‘Initial Conditions’ block and set ‘Start from File’, deselect ‘Save Current States to File’ and assign the name of the ‘Final States File’ to the ‘Initial States File Name’.

 

In this way the following simulations start with the system already pressurised.

 

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