Disc Friction Clutch

Friction clutch with disc plates that engage when plate pressure exceeds threshold

Libraries:
Simscape / Driveline / Clutches

Description

The Disc Friction Clutch block represents a friction clutch with two flat friction plate sets that come into contact to engage. The clutch engages when the applied plate pressure exceeds an engagement threshold pressure. Once engaged, the plates experience frictional torques that enable them to transmit power between the base and follower driveshafts.

The clutch can be bidirectional or unidirectional. A bidirectional clutch can slip in the positive and negative directions. A unidirectional clutch can slip only in the positive direction. The slip direction is positive if the follower shaft spins faster than the base shaft and negative if it slips slower. The block defines the slip velocity as the difference

$ω = ω_{F} - ω_{B},$

where:

ω is the relative angular velocity or slip velocity.
ω_F is the angular velocity of the follower driveshaft.
ω_B is the angular velocity of the base driveshaft.

The block provides a physical signal input port P for the applied pressure between the clutch plates. The applied pressure must be greater than or equal to zero. If the input signal falls below zero, the block treats the plate pressure as zero.

Equations

The Disc Friction Clutch block is a simplified implementation of the Fundamental Friction Clutch block. The Fundamental Friction Clutch requires the kinetic and static friction limit torques as input signals. The Disc Friction Clutch does not require the input data. Instead, the block calculates the kinetic and static friction from the clutch parameters and the input pressure signal P.

When you apply a pressure signal above threshold, such that the applied pressure equals or exceeds the pressure threshold, that is, $P \geq P_{t h}$ , the block can apply two kinds of friction to the driveline motion, kinetic and static. The clutch applies kinetic friction torque only when one driveline axis is spinning relative to the other driveline axis. The clutch applies static friction torque when the two driveline axes lock and spin together. The block iterates through multistep testing to determine when to lock and unlock the clutch.

Kinetic Friction

The kinetic friction torque opposes the relative slip and is applied with an overall minus sign. Mathematically, the kinetic friction is the positive sum of viscous drag and surface contact friction torques:

$τ_{k} = μ \cdot ω + τ_{c o n t a c t} .$

τ_K is the kinetic friction torque.
μ is the viscous drag coefficient.
ω is the relative angular velocity, or slip velocity.
τ_contact is the contact torque.

The contact friction is a product of six factors such that

$τ_{c o n t a c t} = k_{K} \cdot D \cdot N \cdot r_{e f f} \cdot P_{f r i c} \cdot A \geq 0,$

where:

k_K is the dimensionless coefficient of kinetic friction of clutch discs, which is a function of ω.
D is the clutch de-rating factor.
N is the number of friction surfaces.
r_eff is the effective torque radius, that is, the effective moment arm of clutch friction force.
P_fric is the clutch friction capacity, such that $P_{f r i c} = \max [(P - P_{t h}), 0]$ .
A is the engagement surface area.

You specify the kinetic friction coefficient, k_K, as either a constant or a tabulated discrete function of relative angular velocity ω. The tabulated function is assumed to be symmetric for positive and negative values of the relative angular velocity. Therefore, specify k_K for positive values of ω only.

The clutch applies a normal force from its piston as the product of the clutch friction capacity, P_fric, and engagement surface area, A, on each of N friction surfaces. The pressure signal, P, should be nonnegative. If P is less than the pressure threshold. P_th, the clutch applies no friction at all.

The effective torque radius, r_eff, is the effective moment arm of clutch friction force, measured from the driveline axis, at which the kinetic friction forces are applied at the frictional surfaces. It is related to the geometry of the friction surface by:

$r_{eff} = \frac{2}{3} \frac{r_{o}^{3} - r_{i}^{3}}{r_{o}^{2} - r_{i}^{2}},$

where, for a friction surface, modeled as an annular disc:

r_o is the outer disc radius.
r_i is the inner disc radius.

The clutch de-rating factor, D, accounts for clutch wear. For a new clutch, D is one. For a clutch approaching a uniform wear state:

$D \to \frac{3}{4} \frac{{(r_{o} + r_{i})}^{2}}{r_{o}^{2} + r_{o} r_{i} + r_{i}^{2}} .$

Static Friction

The static friction limit is related to the kinetic friction, setting ω to zero and replacing the kinetic with the static friction coefficient:

$τ_{S} = k_{S} \cdot D \cdot N \cdot r_{e f f} \cdot P_{f r i c} \cdot A \geq 0.$

where:

τ_S is the static friction torque limit, which is the product of the static friction peak factor and the kinetic friction torque as ω approaches 0.
k_K is the dimensionless coefficient of static friction of clutch discs.
D is the clutch de-rating factor.
N is the number of friction surfaces.
r_eff is the effective torque radius, that is, the effective moment arm of clutch friction force.
P_fric is the clutch friction capacity, such that $P_{f r i c} = \max [(P - P_{t h}), 0]$ .
A is the engagement surface area.

$k_{S} > k_{K}$ , so that the torque τ needed across the clutch to unlock it by overcoming static friction is larger than the kinetic friction at the instant of unlocking, when $ω = 0.$ .

The static friction torque range or limits are then defined symmetrically as

$τ_{S} \equiv τ_{S}^{+} = - τ_{S}^{-} .$

Wait State: Locking and Unlocking

The Wait state of the Disc Friction Clutch is identical to the Wait state of the Fundamental Friction Clutch, with the replacement of the positive kinetic friction condition, $τ_{K} > 0$ , by the positive clutch friction capacity condition, the applied pressure equals or exceeds the pressure threshold, that is, $P \geq P_{t h}$ .

Power Dissipated by the Clutch

The power dissipated by the clutch is the absolute value of the product of slip velocity, ω, and the kinetic friction torque, τ_K, that is, $| ω \cdot τ_{K} |$ . The clutch dissipates power only if it is both slipping, $ω \neq 0$ , and applying kinetic friction, $τ_{k} > 0$ .

Velocity-Dependent and Temperature-Dependent Friction Models

Velocity-Dependent Model

You can model the effects of rotational velocity change by selecting a velocity-dependent model. To choose a velocity-dependent model, in the Friction settings, set the Friction model parameter to Velocity-dependent kinetic friction coefficient. For information about a friction model that depends on both velocity and temperature, see Thermal, Velocity-Dependent Model.

For the velocity-dependent model these related parameters become visible in the Friction settings:

Relative velocity vector
Kinetic friction coefficient vector
Friction coefficient interpolation method
Friction coefficient extrapolation method

Thermal Model

You can model the effects of heat flow and temperature change by selecting a temperature-dependent model. To choose a temperature-dependent model, in the Friction settings, set the Friction model parameter to Temperature-dependent friction coefficients. For information about a friction model that depends on both velocity and temperature, see Thermal, Velocity-Dependent Model.

Thermal, Velocity-Dependent Model

You can model the effects of rotational velocity change and heat flow by selecting a velocity-dependent and temperature-dependent model. To choose a model that depends on both velocity and temperature, in the Friction settings, set the Friction model parameter to Temperature and velocity-dependent friction coefficients.

Faults

To model a fault in the Disc Friction Clutch block, in the Faults section, click the Add fault hyperlink next to the fault that you want to model. For more information about fault modeling, see Fault Behavior Modeling and Fault Triggering.

You can choose either or both of these settings for block faulting. When you trigger a fault, the block responds according to the setting of the Behavior when faulted parameter for the remainder of the simulation. The fault options are:

Cannot transmit power
Cannot unlock

Ports

Input

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P — Pressure
physical signal

Physical signal input port for the applied pressure between the clutch plates, in Pascals. The block saturates signals less than zero to zero.

Conserving

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B — Base
mechanical rotational

Rotational conserving port associated with the driving, or base, shaft.

F — Follower
mechanical rotational

Rotational conserving port associated with the driven, or follower, shaft.

H — Heat flow
thermal

Thermal conserving port associated with heat flow.

Dependencies

This port is visible only when, in the Friction settings, the Friction model parameter is set to Temperature-dependent friction coefficients or Temperature and velocity-dependent friction coefficients. For more information, see Friction Parameter Dependencies and Friction model.

Parameters

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Geometry

Geometry model — Geometry parameterization method
`Define effective radius` (default) | `Define annular region`

Parameterization method for modeling the clutch friction geometry.

Dependencies

The Effective torque radius parameter is visible only If this parameter is set to Define effective radius:

These parameters are visible only If this parameter is set to Define annular region:

Friction surface outside diameter
Friction surface inside diameter

Effective torque radius — Moment arm radius
`130mm` (default) | positive scalar

Effective moment arm radius, r_eff, that determines the kinetic friction torque inside the clutch.

Dependencies

This parameter is visible only if the Geometry model parameter is set to Define effective radius.

Friction surface outside diameter — Friction surface outer diameter
`150` `mm` (default) | positive scalar

Diameter, 2r_o, across the outer edge of the friction disc annulus.

Dependencies

This parameter is visible only if the Geometry model parameter is set to Define annular region.

Friction surface inside diameter — Friction surface inner diameter
`100` `mm` (default) | nonnegative scalar

Diameter, 2r_i, across the inner edge of the friction disc annulus.

Dependencies

This parameter is visible only if the Geometry model parameter is set to Define annular region.

Number of friction surfaces — number of friction surfaces
`4` (default) | positive scalar integer

Number, N, of friction-generating contact surfaces inside the clutch.

Engagement piston area — Pressure application area
`0.001` `m^2` (default) | positive scalar

Effective area, A, of the clutch piston when the piston is applying pressure across the clutch.

Directionality — Allowable slip directions
`Bidirectional` (default) | `Unidirectional`

Slip directions the clutch allows between its plates. A bidirectional clutch allows positive and negative slip velocities. A unidirectional clutch allows only positive slip velocities.

The unidirectional clutch is equivalent to a friction clutch connected in parallel to a one-way clutch that disengages only when the slip velocity becomes positive. To model a unidirectional clutch with slip in the negative direction, reverse the base and follower port connections.

Friction

The table shows how the visibility of some ports, parameters, and settings depends on the option that you choose for other parameters.

Friction Parameter Dependencies

Friction
Friction model
`Fixed kinetic friction coefficient`	`Velocity-dependent kinetic friction coefficient`	`Temperature-dependent friction coefficients`	`Temperature and velocity-dependent friction coefficients`
`Fixed kinetic friction coefficient`	`Velocity-dependent kinetic friction coefficient`	Exposes: Conserving port H Thermal Port settings	Exposes: Conserving port H Thermal Port settings
-	Relative velocity vector	-	Relative velocity vector
-	-	Temperature vector	Temperature vector
Static friction coefficient	Static friction coefficient	Static friction coefficient vector	Static friction coefficient vector
Kinetic friction coefficient	Kinetic friction coefficient vector	Kinetic friction coefficient vector	Kinetic friction coefficient matrix
-	Friction coefficient interpolation method	Friction coefficient interpolation method	Friction coefficient interpolation method
-	Friction coefficient extrapolation method	Friction coefficient extrapolation method	Friction coefficient extrapolation method
De-rating factor	De-rating factor	De-rating factor	De-rating factor
Clutch velocity tolerance	Clutch velocity tolerance	Clutch velocity tolerance	Clutch velocity tolerance
Engagement threshold pressure	Engagement threshold pressure	Engagement threshold pressure	Engagement threshold pressure

Friction model — Friction model
`Fixed kinetic friction coefficient` (default) | `Velocity-dependent kinetic friction coefficient` | `Temperature-dependent friction coefficients` | `Temperature and velocity-dependent friction coefficients`

Parameterization method to model the kinetic friction coefficient. The options and default values for this parameter depend on the friction model that you select for the block. The options are:

Fixed kinetic friction coefficient — Provide a fixed value for the kinetic friction coefficient.
Velocity-dependent kinetic friction coefficient — Define the kinetic friction coefficient by one-dimensional table lookup based on the relative angular velocity between discs.
Temperature-dependent friction coefficients — Define the kinetic friction coefficient by table lookup based on the temperature.
Temperature and velocity-dependent friction coefficients — Define the kinetic friction coefficient by table lookup based on the temperature and the relative angular velocity between discs.

Dependencies

The friction model setting affects the visibility of other parameters, settings, and ports. For more information, see Friction Parameter Dependencies.

Relative velocity vector — Relative velocity
`[0, 100, 1000]` `rad/s` (default) | vector

Input values for the relative velocity as a vector. The values in the vector must increase from left to right. The minimum number of values depends on the interpolation method that you select. For linear interpolation, provide at least two values per dimension. For smooth interpolation, provide at least three values per dimension.

Dependencies

This parameter is visible only if the Friction model parameter is set to Velocity-dependent kinetic friction coefficient or Temperature and velocity-dependent friction coefficients. For more information, see Friction Parameter Dependencies.

Temperature vector — Temperature
`[280, 300, 320]` `K` (default) | increasing vector

Input values for the temperature as a vector. The minimum number of values depends on the interpolation method that you select. For linear interpolation, provide at least two values per dimension. For smooth interpolation, provide at least three values per dimension. The values in the vector must increase from left to right.

Dependencies

This parameter is visible only if the Friction model parameter is set to Temperature-dependent friction coefficients or Temperature and velocity-dependent friction coefficients. For more information, see Friction Parameter Dependencies.

Static friction coefficient — Static friction coefficient
`0.35` (default) | positive scalar

Static or peak value of the friction coefficient. The static friction coefficient must be greater than the kinetic friction coefficient.

Dependencies

This parameter is visible only when the Friction model parameter is set to Fixed kinetic friction coefficient or Velocity-dependent kinetic friction coefficient. For more information, see Friction Parameter Dependencies.

Static friction coefficient vector — Static friction coefficient
`[.4, .38, .36]` (default) | vector

Static, or peak, values of the friction coefficient as a vector. The vector must have the same number of elements as the temperature vector. Each value must be greater than the value of the corresponding element in the kinetic friction coefficient vector.

Dependencies

Kinetic friction coefficient — Kinetic friction coefficient
`0.3` (default) | positive scalar

The kinetic, or Coulomb, friction coefficient. The coefficient must be greater than zero.

Dependencies

This parameter is visible only if the Friction model parameter is set to Fixed kinetic friction coefficient. For more information, see Friction Parameter Dependencies.

Kinetic friction coefficient vector — Kinetic friction coefficient
`[.3, .22, .19]` (default) | `[.3, .28, .25]` | positive vector

Output values for kinetic friction coefficient as a vector. All values must be greater than zero.

If the Friction model parameter is set to

Velocity-dependent kinetic friction coefficient — The vector must have same number of elements as relative velocity vector.
Temperature-dependent friction coefficients — The vector must have the same number of elements as the temperature vector.

Dependencies

This parameter is visible only if the Friction model parameter is set to Velocity-dependent kinetic friction coefficient or Temperature-dependent friction coefficients. For more information, see Friction Parameter Dependencies.

Kinetic friction coefficient matrix — Kinetic friction coefficient
`[.34, .32, .3; .3, .28, .25; .25, .2, .15]` (default) | positive matrix

Output values for kinetic friction coefficient as a matrix. All the values must be greater than zero. The size of the matrix must equal the size of the matrix that is the result of the temperature vector × the kinetic friction coefficient relative velocity vector.

Dependencies

This parameter is visible only if the Friction model parameter is set to Temperature and velocity-dependent friction coefficients. For more information, see Friction Parameter Dependencies.

Friction coefficient interpolation method — Extrapolation method
`Linear` (default) | `Smooth`

Interpolation method for approximating the output value when the input value is between two consecutive grid points:

Linear — Select this option to get the best performance.
Smooth — Select this option to produce a continuous curve with continuous first-order derivatives.

For more information on interpolation algorithms, see the PS Lookup Table (1D) block reference page.

Dependencies

This parameter is visible only if the Friction model parameter is set to Velocity-dependent kinetic friction coefficient, Temperature-dependent friction coefficients, or Temperature and velocity-dependent friction coefficients. For more information, see Friction Parameter Dependencies.

Friction coefficient extrapolation method — Interpolation method
`Linear` (default) | `Nearest` | `Error`

Extrapolation method for determining the output value when the input value is outside the range specified in the argument list:

Linear — Select this option to produce a curve with continuous first-order derivatives in the extrapolation region and at the boundary with the interpolation region.
Nearest — Select this option to produce an extrapolation that does not go above the highest point in the data or below the lowest point in the data.
Error — Select this option to avoid going into the extrapolation mode when you want your data to be within the table range. If the input signal is outside the range of the table, the simulation stops and generates an error.

For more information on extrapolation algorithms, see the PS Lookup Table (1D) block reference page.

Dependencies

De-rating factor — De-rating factod
`1` (default) | positive scalar

Dimensionless de-rating factor, D, that accounts for clutch disc wear by proportionately reducing clutch friction.

Clutch velocity tolerance — Relative velocity locking threshold
`0.001` `rad/s` (default) | nonnegative scalar

Maximum slip velocity at which the clutch can lock. The slip velocity is the signed difference between the base and follower shaft angular velocities, that is, $w = w_{F} - w_{B}$ . If the kinetic friction torque is nonzero and the transferred torque is within the static friction torque limits, then the clutch locks if the actual slip velocity falls below the velocity tolerance.

Engagement threshold pressure — Normal contact force threshold
`100` `Pa` (default) | nonnegative scalar

Minimum pressure P_th at which the clutch engages. If the pressure input signal falls below this threshold, the clutch automatically disengages.

Viscous Losses

Viscous drag torque coefficient — Viscous drag torque coefficient
`0` `N*m/(rad/s)` (default) | nonnegative scalar

Viscous friction coefficient μ applied to the relative slip ω between the base and follower axes.

Initial Conditions

Initial state — Initial clutch state
`Unlocked` (default) | `Locked`

Clutch state at the start of simulation. The clutch can be in one of two states, locked and unlocked. A locked clutch constrains the base and follower shafts to spin at the same velocity, that is, as a single unit. An unlocked clutch allows the two shafts to spin at different velocities, resulting in slip between the clutch plates.

Faults

To modify the faults, create a fault and, in the block dialog, click Open fault properties. In the Property Inspector, click the Fault behavior link to open the faults.

Friction fault — Option to model clutch failure
`Add fault`

Whether to model a clutch fault in the block. To add a fault, click the Add fault hyperlink.

Behavior when faulted — Clutch fault response
`Cannot transmit power` (default) | `Cannot unlock`

Clutch response when a fault is triggered. You can select the clutch faulting as either:

Cannot transmit power
Cannot unlock

Dependencies

To enable this parameter, enable faults for the block by clicking the Add fault hyperlink.

Thermal Port

Thermal Port settings are visible only when, in the Friction settings, the Friction model parameter is set to Temperature-dependent friction coefficients or Temperature and velocity-dependent friction coefficients. For more information, see Friction Parameter Dependencies.

Thermal mass — Thermal mass
`50` `kJ/K` (default) | scalar

Thermal energy required to change the component temperature by a single degree. The greater the thermal mass, the more resistant the component is to temperature change.

Dependencies

This parameter is visible only when, in the Friction settings, the Friction model parameter is set to Temperature-dependent friction coefficients or Temperature and velocity-dependent friction coefficients. For more information, see Friction Parameter Dependencies.

Initial temperature — Initial temperature
`300` `K` (default) | scalar

Component temperature at the start of simulation. The initial temperature alters the component efficiency according to an efficiency vector that you specify, affecting the starting meshing or friction losses. The default value is 300 K.

Dependencies

This parameter is only visible when, in the Friction settings, the Friction model parameter is set to Temperature-dependent friction coefficients or Temperature and velocity-dependent friction coefficients. For more information, see Friction Parameter Dependencies.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2011a

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R2024a: Model faults with the Simscape faults interface

The Disc Friction Clutch block now supports the Simscape faults interface. To learn more, see Introduction to Simscape Faults.

Disc Friction Clutch

Description

Equations

Velocity-Dependent and Temperature-Dependent Friction Models

Faults

Ports

Input

P — Pressure physical signal

Conserving

B — Base mechanical rotational

F — Follower mechanical rotational

H — Heat flow thermal

Dependencies

Parameters

Geometry

Geometry model — Geometry parameterization method Define effective radius (default) | Define annular region

Dependencies

Effective torque radius — Moment arm radius 130mm (default) | positive scalar

Dependencies

Friction surface outside diameter — Friction surface outer diameter 150 mm (default) | positive scalar

Dependencies

Friction surface inside diameter — Friction surface inner diameter 100 mm (default) | nonnegative scalar

Dependencies

Number of friction surfaces — number of friction surfaces 4 (default) | positive scalar integer

Engagement piston area — Pressure application area 0.001 m^2 (default) | positive scalar

Directionality — Allowable slip directions Bidirectional (default) | Unidirectional

Friction

Friction model — Friction model Fixed kinetic friction coefficient (default) | Velocity-dependent kinetic friction coefficient | Temperature-dependent friction coefficients | Temperature and velocity-dependent friction coefficients

Dependencies

Relative velocity vector — Relative velocity [0, 100, 1000] rad/s (default) | vector

Dependencies

Temperature vector — Temperature [280, 300, 320] K (default) | increasing vector

Dependencies

Static friction coefficient — Static friction coefficient 0.35 (default) | positive scalar

Dependencies

Static friction coefficient vector — Static friction coefficient [.4, .38, .36] (default) | vector

Dependencies

Kinetic friction coefficient — Kinetic friction coefficient 0.3 (default) | positive scalar

Dependencies

Kinetic friction coefficient vector — Kinetic friction coefficient [.3, .22, .19] (default) | [.3, .28, .25] | positive vector

Dependencies

Kinetic friction coefficient matrix — Kinetic friction coefficient [.34, .32, .3; .3, .28, .25; .25, .2, .15] (default) | positive matrix

Dependencies

Friction coefficient interpolation method — Extrapolation method Linear (default) | Smooth

Dependencies

Friction coefficient extrapolation method — Interpolation method Linear (default) | Nearest | Error

Dependencies

De-rating factor — De-rating factod 1 (default) | positive scalar

Clutch velocity tolerance — Relative velocity locking threshold 0.001 rad/s (default) | nonnegative scalar

Engagement threshold pressure — Normal contact force threshold 100 Pa (default) | nonnegative scalar

Viscous Losses

Viscous drag torque coefficient — Viscous drag torque coefficient 0 N*m/(rad/s) (default) | nonnegative scalar

Initial Conditions

Initial state — Initial clutch state Unlocked (default) | Locked

Faults

Friction fault — Option to model clutch failure Add fault

Behavior when faulted — Clutch fault response Cannot transmit power (default) | Cannot unlock

Dependencies

Thermal Port

Thermal mass — Thermal mass 50 kJ/K (default) | scalar

Dependencies

Initial temperature — Initial temperature 300 K (default) | scalar

Dependencies

Extended Capabilities

C/C++ Code Generation Generate C and C++ code using Simulink® Coder™.

Version History

R2024a: Model faults with the Simscape faults interface

See Also

Topics

P — Pressure
physical signal

B — Base
mechanical rotational

F — Follower
mechanical rotational

H — Heat flow
thermal

Geometry model — Geometry parameterization method
`Define effective radius` (default) | `Define annular region`

Effective torque radius — Moment arm radius
`130mm` (default) | positive scalar

Friction surface outside diameter — Friction surface outer diameter
`150` `mm` (default) | positive scalar

Friction surface inside diameter — Friction surface inner diameter
`100` `mm` (default) | nonnegative scalar

Number of friction surfaces — number of friction surfaces
`4` (default) | positive scalar integer

Engagement piston area — Pressure application area
`0.001` `m^2` (default) | positive scalar

Directionality — Allowable slip directions
`Bidirectional` (default) | `Unidirectional`

Friction model — Friction model
`Fixed kinetic friction coefficient` (default) | `Velocity-dependent kinetic friction coefficient` | `Temperature-dependent friction coefficients` | `Temperature and velocity-dependent friction coefficients`

Relative velocity vector — Relative velocity
`[0, 100, 1000]` `rad/s` (default) | vector

Temperature vector — Temperature
`[280, 300, 320]` `K` (default) | increasing vector

Static friction coefficient — Static friction coefficient
`0.35` (default) | positive scalar

Static friction coefficient vector — Static friction coefficient
`[.4, .38, .36]` (default) | vector

Kinetic friction coefficient — Kinetic friction coefficient
`0.3` (default) | positive scalar

Kinetic friction coefficient vector — Kinetic friction coefficient
`[.3, .22, .19]` (default) | `[.3, .28, .25]` | positive vector

Kinetic friction coefficient matrix — Kinetic friction coefficient
`[.34, .32, .3; .3, .28, .25; .25, .2, .15]` (default) | positive matrix

Friction coefficient interpolation method — Extrapolation method
`Linear` (default) | `Smooth`

Friction coefficient extrapolation method — Interpolation method
`Linear` (default) | `Nearest` | `Error`

De-rating factor — De-rating factod
`1` (default) | positive scalar

Clutch velocity tolerance — Relative velocity locking threshold
`0.001` `rad/s` (default) | nonnegative scalar

Engagement threshold pressure — Normal contact force threshold
`100` `Pa` (default) | nonnegative scalar

Viscous drag torque coefficient — Viscous drag torque coefficient
`0` `N*m/(rad/s)` (default) | nonnegative scalar

Initial state — Initial clutch state
`Unlocked` (default) | `Locked`

Friction fault — Option to model clutch failure
`Add fault`

Behavior when faulted — Clutch fault response
`Cannot transmit power` (default) | `Cannot unlock`

Thermal mass — Thermal mass
`50` `kJ/K` (default) | scalar

Initial temperature — Initial temperature
`300` `K` (default) | scalar

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.