Engee documentation

Rotational Damper (Advanced)

Linear damper in rotational systems.

blockType: Engee1DMechanical.Elements.Rotational.LinearDamper

rotational damper advanced

Path in the library:

/Physical Modeling/1D Mechanical/Couplings & Drives/Springs & Dampers/Rotational Damper (Advanced)

Description

Block Rotational Damper (Advanced) It is a linear mechanical rotational viscous damper described by the following equations:

ω

ωωω

where

  • — the torque transmitted through the damper;

  • — coefficient of damping (viscous friction);

  • — relative angular velocity;

  • — absolute angular velocities at ports R and C, respectively.

The positive direction of the block is from port R to port C. This means that the torque is positive if it acts in the direction from R to C.

The thermal model

You can simulate the effects of heat flow and temperature changes by turning on an additional heat port H. To use the thermal port H, check the box for the parameter Enable thermal port.

Enabling thermal modeling opens the parameter Thermal mass and the section Initial Targets.

Variables

Use the parameter group Initial Targets to set the priority and initial target values for the block parameter variables before modeling. For more information, see Configuring physical blocks using target values.

Ports

Conserving

# R — mechanical port
rotational mechanics

Details

Mechanical rotary port, corresponds to the damper rod.

Program usage name

rod_flange

# C — mechanical port
rotational mechanics

Details

Mechanical rotary port, corresponds to the damper body.

Program usage name

case_flange

# H — heat flow
warm

Details

A non-directional port connected to the heat flow.

The thermal port allows you to simulate the heat flow between the unit and the connected network.

Dependencies

To use this port, check the box for the parameter Enable thermal port.

Program usage name

thermal_port

Parameters

Main

# Damping coefficient — damping coefficient
N*m*s/rad | mN*m*s/rad | kN*m*s/rad | kgf*m*s/rad | lbf*ft*s/rad

Details

A torque that reduces vibrations due to viscous friction, which the unit applies if no trigger event occurs. Specify a value that is greater than or equal to zero.

Units

N*m*s/rad | mN*m*s/rad | kN*m*s/rad | kgf*m*s/rad | lbf*ft*s/rad
Default value

1e-3 N*m*s/rad
Program usage name

C
Evaluatable

Yes

Thermal Port

# Enable thermal port — turning on the thermal port

Details

When this check box is selected, the thermal port H is displayed, which allows you to simulate the effects of heat flow and temperature changes. Setting this check box also enables parameters Thermal mass and Temperature.

Default value

false (switched off)
Program usage name

has_thermal_port
Evaluatable

No

# Thermal mass — heat capacity
J/K | kJ/K

Details

The thermal energy required to change the temperature of a component by one degree. The heat capacity is the ability of the damper to absorb and retain thermal energy.

Dependencies

To use this parameter, select the check box Enable thermal port.

Units

J/K | kJ/K
Default value

50.0 kJ/K
Program usage name

thermal_mass
Evaluatable

Yes