Unwind Drum Two Webs - MapleSim Help

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Unwind Drum Two Webs

Multi-web unwind drum component

	Description
	The Unwind Drum Two Webs component models simultaneous unwinding of two webs with variable roll radius and inertia.

	Usage
	The Unwind Drum component must be at the start of two web lines. Using the provided 1D rotational flange ( ${flange}_{c}$ ) the component can be equipped with a motor.

Equations

Consider the drum shown below

$T_{b1}, T_{b2}$	Downstream tension
$v_{b1}, v_{b2}$	Downstream speed
$τ$	Motor torque (zero if modeling an idler roller)
$ω$	Angular velocity (positive means wind)
$R_{c}$	Core radius
$R_{1} (t), R_{2} (t)$	Instantaneous roll radii for web 1 and 2
$d_{B}$	Bearing damping coefficient
${th}_{1}, {th}_{2}$	Web thicknesses
$W_{1}, W_{2}$	Web widths

$- T_{b1} R_{1} (t) - T_{b2} R_{2} (t) = τ_{m} - J (t) d ω \frac{1}{d t} - d_{B} ω$

$v_{b1} = R_{1} ω$

$v_{b2} = R_{2} ω$

The roll inertia consists of the core inertia, $J_{c}$ , and the approximate roll variable inertia, $J (t)$ :

$J (t) = J_{c} + \frac{π}{2} \overset{&Hat;}{λ} ({R (t)}^{4} - R_{c}^{4})$

where

$\overset{&Hat;}{λ} = \frac{W_{1} ρ_{1} {th}_{1} + W_{2} ρ_{2} {th}_{2}}{{th}_{1} + {th}_{2}}$

Roll Radius

The time-varying roll radius is given by the following differential equations:

When Use stepwise is false, the effective roll radius is given by

$\frac{dR (t)}{dt} = - ω \frac{{th}_{1} + {th}_{2}}{2 π}$

with the following initial value:

$R (0) = \frac{1}{2} (D_{init} + {th}_{1} + {th}_{2})$

The radii of the layers are calculated as

$R_{1} (t) = R (t) - \frac{{th}_{2}}{2}$

$R_{2} (t) = R (t) + \frac{{th}_{1}}{2}$

When Use stepwise is true, the effective roll radius is given by

$\frac{dR (t)}{dt} = {\begin{array}{c} - ω \frac{{th}_{1} + {th}_{2}}{δ_{φ}} & 0 < φ < δ_{φ} \\ 0 & otherwise \end{array}$

where $φ$ is the rotation of the drum between $0$ and $2 π$ and the roll radius decreases only over a portion of each turn defined by the merge angle $δ_{φ}$ .

We also have the following initial value

$R (0) = \frac{1}{2} (D_{init} + {th}_{1} + {th}_{2})$

The radii of the layers are now calculated as

$R_{1} (t) = R (t) - \frac{{th}_{2}}{2}$

$R_{2} (t) = R (t) + \frac{{th}_{1}}{2}$

Connections

Name	Description	Modelica ID
${frame}_{b1}$	Right web #1 3D connection point	frame_b1
${frame}_{b2}$	Right web #2 3D connection point	frame_b2
${frame}_{c}$	Roller holder base frame	frame_c
${frame}_{d}$	External mass/inertia	frame_d
${web}_{b1}$	Web #1 exit transfer information port	web_b1
${web}_{b2}$	Web #2 exit transfer information port	web_b2
${flange}_{c}$	Drum rotation flange	flange_c
$Rmax$	Real output; drum and web radius [m]	Rmax
${ecc}_{in}$	Eccentricity signal (in meters)	ecc_in
$reset$	Boolean input signal to trigger roll radius reset	reset

Parameters

Drum

Name	Default	Units	Description	Modelica ID
$D_{init}$	$0.4$	$m$	Initial roll diameter	D_init
$D$	$0.1$	$m$	Core diameter	D
$D_{i}$	$0$	$m$	Core inner diameter	Di
$L$	$1.2$	$m$	Drum length	L
$ρ$	$2.7 \cdot 10^{3}$	$\frac{kg}{m^{3}}$	Drum core density	rho_roll
Use cylindrical geometry	$true$		When checked (true), drum core inertia is calculated assuming a uniform cylindrical geometry	useCylindricalGeometry
$m$	$1$	$kg$	Drum core mass (excluding the holder frame)	m
$J$	$0.005$	$kg m^{2}$	Drum core rotational inertia	J
$d$	$0$	$N m \frac{s}{rad}$	Bearing viscous damping constant	d
Use CAD	$false$		when checked (true), mass and inertia are defined from an externally attached CAD component or a rigid body component	useCAD
Use reset	$false$		The roller diameter is reset to D_init with an external signal	useReset
Use stepwise	$false$		When checked (true), the roll diameter is changed over a portion of each rotation (instead of changing continuously)	useStepwise
$φ_{0}$	$0$	$rad$	Angle offset	phi0
$φ_{1}$	$\frac{π}{2}$	$rad$	Merge angle	phi1

Eccentricity

Name	Default	Units	Description	Modelica ID
Add eccentricity	$false$		When checked (true), a parameter is enabled for the roller eccentricity	addEccentricity
Use input	$false$		When checked (true), eccentricity is given by an input signal in meters	useInputEccentricity
$e$	$0$	$m$	Roller eccentricity	ecc
$θ_{0}$	$0$	$rad$	Initial eccentricity angle	theta_ecc0

Frame

Name	Default	Units	Description	Modelica ID
$m_{f}$	$1$	$kg$	Frame mass	m_frame
$J_{f}$	$0$	$kg m^{2}$	Frame inertia	J_frame
Add frame offset	$false$		When checked (true), frame connection point is placed at an offset w.r.t. the roll center	addFrameOffset
$r_{f}$	$[0, 0]$	$m$	Offset in the XY plane [1]	rf [1] Enabled if Add frame offset is true.

Settings

Name	Default	Units	Description	Modelica ID
Use alternative configuration	$false$		Choose between two possible solutions for the web/roll configuration	useAltConfig
Flip direction	$false$		Use this option when building web lines that go from right to left. See documentation for more information	flipDirection
Use fixed base	$false$		When checked (true), frame is fixed in the inertial coordinate frame	useFixedBase
$r$	$[0, 0]$	$m$	Location of frame_b with respect to ground [1]	InitPos
$θ$	$0$	$\deg$	Rotation about z axis [1]	InitAng
Enable radius sensor	$false$		When checked (true), drum outer radius is provided via an output signal	useSensor

[1] Available when $Use fixed base = true$ .

Visualization

Name	Default	Units	Description	Modelica ID
Show drum visualization	$true$		When checked (true), a visualization is produced for the drum	showVisualization_drum
Transparent drum	$false$		When checked (true), the drum visualization is transparent [1]	transparent_drum
Drum color	Blue		Color of the drum [1]	color_drum
Band color	Yellow		Color of a radial band on the drum [1]	color_band
Band angle	$20$	$\deg$	Band angle [1]	band_angle
Show frame	$true$		When checked (true), a visualization of the frame is created [4]	showVisualization_frame
Transparent frame	$false$		When checked (true) the frame visualization is transparent [4] and [5]	transparent_frame
Frame color	Orange		Color of the frame; [4] and [5]	color_frame
Show reaction force arrow	$false$		When checked (true), ground reaction force is visualized with an arrow	showReactionForce
Force arrow scale	$1000$	$1$	Force scale (N to m) [2]	forceScale
Force arrow color	Cyan		Force arrow color [2]	forceColor
Force arrow transparency	$false$		Force arrow transparency [2]	forceTransparent
Show reaction torque arrow	$false$		When checked (true), ground reaction force is visualized with an arrow	showReactionTorque
Torque arrow scale	$100$	$1$	Torque scale (Nm to m) [3]	torqueScale
Torque arrow color	Magenta		Torque arrow color [3]	torqueColor
Torque arrow transparency	$false$		Torque arrow transparency [3]	torqueTransparent

[1] Enabled if Show drum visualization is true.

[2] Enabled if Show reaction force arrow is true.

[3] Enabled if Show reaction torque arrow is true.

[4] Enabled if Add frame offset is true.

[5] Enabled if Show frame is true

Web Properties

Name	Default	Description	Modelica ID
Web Properties for layer 1	WP1	Name of the Web Properties record for layer 1 (bottom)	wp1
Web Properties for layer 2	WP2	Name of the Web Properties record for layer 2 (top)	wp2
Comp. Factor	$1$	Ratio of the thickness of the mixed web to the sum of thicknesses of component webs	CompressionFactor

Summary Variables

Name	Units	Description	Modelica ID
summary_Radius	$m$	Roll radius	summary_Radius
summary_Layers		Number of layers radius	summary_Layers

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