Interface between thermal liquid and mechanical rotational networks
The Rotational Mechanical Converter (TL) block represents the liquid side of a rotational mechanical interface. This interface converts liquid pressure into torque and vice versa. The output torque acts in a single direction, set using a Mechanical orientation parameter.
The rotational mechanical interface contains no hard stops. To include hard stops, use the Simscape™ Rotational Hard Stop block. A model of a rotational hydraulic actuator, for example, requires both blocks.
Port A is a thermal liquid conserving port corresponding to the converter inlet. Liquid pressure in the converter equals that at port A. Port Q is a thermal conserving port for modeling heat exchange between the converter liquid and the converter housing. Liquid temperature in the converter equals that at port Q.
The mass conservation equation in the mechanical converter volume is
is the liquid mass flow rate into the converter through port A.
ε is the mechanical orientation
of the converter (
1 if positive,
ρ is the liquid mass density.
D is the converter displacement.
Ω is the angular velocity of the converter interface (positive for converter expansion, negative for converter contraction).
V is the liquid volume inside the converter.
β is the liquid bulk modulus inside the converter.
α is the coefficient of thermal expansion of the liquid.
p is the liquid pressure inside the converter.
T is the liquid temperature inside the converter.
The momentum conservation equation in the mechanical converter volume is
τ is the torque the liquid exerts on the converter interface.
pAtm is the atmospheric pressure.
The energy conservation equation in the mechanical converter volume is
u is the liquid internal energy in the converter.
ϕA is the total energy flow rate into the mechanical converter volume through port A.
QH is the heat flow rate into the mechanical converter volume through the converter wall.
The block dialog box does not have a Source code link. To view the underlying component source, open the following files in the MATLAB® editor:
Converter walls are not compliant. They cannot deform regardless of internal pressure and temperature.
The converter contains no mechanical hard stop.
Select the relative orientation of the converter with respect
to the thermal liquid system. The relative orientation determines
the rotation direction associated with positive flow into the converter.
That direction is positive if the mechanical orientation of the converter
is positive. It is negative if the mechanical orientation of the converter
is negative. The default setting is
Enter the displaced liquid volume corresponding to a unit rotation
angle of the spinning converter interface. The default value is
Enter the rotation angle between the spinning converter interface
and the clamping structure at time zero. The angle should be positive
for positive mechanical orientations and negative for negative mechanical
orientations. The default value is
Enter the liquid volume remaining in the converter at a zero
rotation angle. The default value is
Enter the flow cross-sectional area at the converter inlet.
The block uses this parameter for thermal conduction calculations.
The default value is
Select a specification method for the environment pressure.
Specified pressure and
pressure. The default setting is
Enter the environment pressure for the component. This parameter
is active only when the Environment pressure specification parameter
is set to
Specified pressure. The default
Select whether to include the effect of fluid dynamic compressibility
on the transient response of the converter model. Selecting
an additional parameter. The default setting is
Enter the liquid temperature in the converter at time zero.
The default value is
Enter the liquid pressure in the converter at time zero. This
parameter is visible only if Fluid dynamic compressibility is
The default value is
This block has four ports.
|A||Thermal liquid conserving port|
|H||Thermal conserving port|
|R||Rotational mechanical conserving port associated with the moving interface|
|C||Rotational mechanical conserving port associated with the converter casing|