Rotational Damper (Advanced)

Linear damper in rotational systems.

blockType: Engee1DMechanical.Elements.Rotational.LinearDamper

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:

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 option Enable thermal port.

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

Ports

Conserving

# R — mechanical port
`rotational mechanics

Details

Mechanical rotational port, corresponds to the damper rod.

Program usage name

rod_flange

# C — mechanical port
`rotational mechanics

Details

Mechanical rotational port, corresponds to the damper housing.

Program usage name

case_flange

# H — heat flux
`heat

Details

A non-directional port associated with heat flow.

The heat port allows modelling the heat flow between the unit and the connected network.

Dependencies

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

Program usage name

thermal_port

Parameters

Main

# Damping coefficient — damping factor
N*m/(rad/s) | ft*lbf/(rad/s)

Details

The torque that reduces oscillations due to viscous friction that the block applies if no start event occurs. Specify a value that is greater than or equal to zero.

Units	`Nm/(rad/s)` \| `ftlbf/(rad/s)`
Default value	`1e-3 N*m/(rad/s)`
Program usage name	`C`
Evaluatable	Yes

Thermal Port

# Enable thermal port — switching on the heat port

Details

Checking this box displays the H heat port, which allows you to simulate the effects of heat flow and temperature changes. Checking this box also enables the Thermal mass and Temperature parameters.

Default value	`false (switched off)`
Program usage name	`has_thermal_port`
Evaluatable	No

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

Details

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

Dependencies

To use this parameter, select the Enable thermal port checkbox.

Units	`J/K` \| `kJ/K`
Default value	`50.0 kJ/K`
Program usage name	`thermal_mass`
Evaluatable	Yes