Modelica.Mechanics.Translational.Interfaces

Interfaces for 1-dim. translational mechanical components

Information

This package contains connectors and partial models for 1-dim. translational mechanical components. The components of this package can only be used as basic building elements for models.

Extends from Modelica.Icons.InterfacesPackage (Icon for packages containing interfaces).

Package Content

Name Description
Modelica.Mechanics.Translational.Interfaces.Flange Flange One-dimensional translational flange
Modelica.Mechanics.Translational.Interfaces.Flange_a Flange_a One-dimensional translational flange (left, flange axis directed INTO cut plane)
Modelica.Mechanics.Translational.Interfaces.Flange_b Flange_b One-dimensional translational flange (right, flange axis directed OUT OF cut plane)
Modelica.Mechanics.Translational.Interfaces.Support Support Support/housing flange of a one-dimensional translational component
Modelica.Mechanics.Translational.Interfaces.InternalSupport InternalSupport Adapter model to utilize conditional support connector
Modelica.Mechanics.Translational.Interfaces.PartialTwoFlanges PartialTwoFlanges Component with two translational 1D flanges
Modelica.Mechanics.Translational.Interfaces.PartialOneFlangeAndSupport PartialOneFlangeAndSupport Partial model for a component with one translational 1-dim. shaft flange and a support used for graphical modeling, i.e., the model is build up by drag-and-drop from elementary components
Modelica.Mechanics.Translational.Interfaces.PartialTwoFlangesAndSupport PartialTwoFlangesAndSupport Partial model for a component with two translational 1-dim. shaft flanges and a support used for graphical modeling, i.e., the model is build up by drag-and-drop from elementary components
Modelica.Mechanics.Translational.Interfaces.PartialRigid PartialRigid Rigid connection of two translational 1D flanges
Modelica.Mechanics.Translational.Interfaces.PartialCompliant PartialCompliant Compliant connection of two translational 1D flanges
Modelica.Mechanics.Translational.Interfaces.PartialCompliantWithRelativeStates PartialCompliantWithRelativeStates Base model for the compliant connection of two translational 1-dim. shaft flanges where the relative position and relative velocities are used as states
Modelica.Mechanics.Translational.Interfaces.PartialElementaryOneFlangeAndSupport PartialElementaryOneFlangeAndSupport Obsolete partial model. Use PartialElementaryOneFlangeAndSupport2.
Modelica.Mechanics.Translational.Interfaces.PartialElementaryOneFlangeAndSupport2 PartialElementaryOneFlangeAndSupport2 Partial model for a component with one translational 1-dim. shaft flange and a support used for textual modeling, i.e., for elementary models
Modelica.Mechanics.Translational.Interfaces.PartialElementaryTwoFlangesAndSupport PartialElementaryTwoFlangesAndSupport Obsolete partial model. Use PartialElementaryTwoFlangesAndSupport2.
Modelica.Mechanics.Translational.Interfaces.PartialElementaryTwoFlangesAndSupport2 PartialElementaryTwoFlangesAndSupport2 Partial model for a component with one translational 1-dim. shaft flange and a support used for textual modeling, i.e., for elementary models
Modelica.Mechanics.Translational.Interfaces.PartialElementaryRotationalToTranslational PartialElementaryRotationalToTranslational Partial model to transform rotational into translational motion
Modelica.Mechanics.Translational.Interfaces.PartialForce PartialForce Partial model of a force acting at the flange (accelerates the flange)
Modelica.Mechanics.Translational.Interfaces.PartialAbsoluteSensor PartialAbsoluteSensor Device to measure a single absolute flange variable
Modelica.Mechanics.Translational.Interfaces.PartialRelativeSensor PartialRelativeSensor Device to measure a single relative variable between two flanges
Modelica.Mechanics.Translational.Interfaces.PartialFriction PartialFriction Base model of Coulomb friction elements

Modelica.Mechanics.Translational.Interfaces.Flange

One-dimensional translational flange

Information

This is a connector for 1D translational mechanical systems. It has no icon definition and is only used by inheritance from flange connectors to define different icons.

The following variables are defined in this connector:

s: Absolute position of the flange in [m]. A positive translation
   means that the flange is translated along the flange axis.
f: Cut-force in direction of the flange axis in [N].

Contents

NameDescription
sAbsolute position of flange [m]
fCut force directed into flange [N]

Modelica.Mechanics.Translational.Interfaces.Flange_a Modelica.Mechanics.Translational.Interfaces.Flange_a

One-dimensional translational flange (left, flange axis directed INTO cut plane)

Information

This is a connector for 1-dim. translational mechanical systems which represents a mechanical flange. In the cut plane of the flange a unit vector n, called flange axis, is defined which is directed INTO the cut plane, i. e. from left to right. All vectors in the cut plane are resolved with respect to this unit vector. E.g. force f characterizes a vector which is directed in the direction of n with value equal to f. When this flange is connected to other 1D translational flanges, this means that the axes vectors of the connected flanges are identical.

The following variables are transported through this connector:

s: Absolute position of the flange in [m]. A positive translation
   means that the flange is translated along the flange axis.
f: Cut-force in direction of the flange axis in [N].

Extends from Flange (One-dimensional translational flange).

Contents

NameDescription
sAbsolute position of flange [m]
fCut force directed into flange [N]

Modelica.Mechanics.Translational.Interfaces.Flange_b Modelica.Mechanics.Translational.Interfaces.Flange_b

One-dimensional translational flange (right, flange axis directed OUT OF cut plane)

Information

This is a connector for 1-dim. translational mechanical systems which represents a mechanical flange. In the cut plane of the flange a unit vector n, called flange axis, is defined which is directed OUT OF the cut plane. All vectors in the cut plane are resolved with respect to this unit vector. E.g. force f characterizes a vector which is directed in the direction of n with value equal to f. When this flange is connected to other 1D translational flanges, this means that the axes vectors of the connected flanges are identical.

The following variables are transported through this connector:

s: Absolute position of the flange in [m]. A positive translation
   means that the flange is translated along the flange axis.
f: Cut-force in direction of the flange axis in [N].

Extends from Flange (One-dimensional translational flange).

Contents

NameDescription
sAbsolute position of flange [m]
fCut force directed into flange [N]

Modelica.Mechanics.Translational.Interfaces.Support Modelica.Mechanics.Translational.Interfaces.Support

Support/housing flange of a one-dimensional translational component

Information

This is a connector for 1-dim. translational mechanical systems and models the support or housing of a shaft. The following variables are defined in this connector:

s: Absolute position of the support/housing in [m].
f: Reaction force in the support/housing in [N].

The support connector is usually defined as conditional connector. It is most convenient to utilize it

Extends from Flange (One-dimensional translational flange).

Contents

NameDescription
sAbsolute position of flange [m]
fCut force directed into flange [N]

Modelica.Mechanics.Translational.Interfaces.InternalSupport Modelica.Mechanics.Translational.Interfaces.InternalSupport

Adapter model to utilize conditional support connector

Information

This is an adapter model to utilize a conditional support connector in an elementary component, i.e., where the component equations are defined textually:

Variable f is defined as input and must be provided when using this component as a modifier (computed via a force balance in the model where InternalSupport is used). Usually, model InternalSupport is utilized via the partial models:

PartialElementaryOneFlangeAndSupport,
PartialElementaryTwoFlangesAndSupport,
PartialElementaryRotationalToTranslational.

Note, the support position can always be accessed as internalSupport.s, and the support force can always be accessed as internalSupport.f.

Connectors

NameDescription
flangeInternal support flange (must be connected to the conditional support connector for useSupport=true and to conditional fixed model for useSupport=false)

Modelica.Mechanics.Translational.Interfaces.PartialTwoFlanges Modelica.Mechanics.Translational.Interfaces.PartialTwoFlanges

Component with two translational 1D flanges

Information

This is a 1D translational component with two flanges. It is used e.g., to built up parts of a drive train consisting of several base components.

Connectors

NameDescription
flange_a(left) driving flange (flange axis directed in to cut plane, e. g. from left to right)
flange_b(right) driven flange (flange axis directed out of cut plane)

Modelica.Mechanics.Translational.Interfaces.PartialOneFlangeAndSupport Modelica.Mechanics.Translational.Interfaces.PartialOneFlangeAndSupport

Partial model for a component with one translational 1-dim. shaft flange and a support used for graphical modeling, i.e., the model is build up by drag-and-drop from elementary components

Information

This is a 1-dim. translational component with one flange and a support/housing. It is used e.g., to build up parts of a drive train graphically consisting of several components.

If useSupport=true, the support connector is conditionally enabled and needs to be connected.
If useSupport=false, the support connector is conditionally disabled and instead the component is internally fixed to ground.

Parameters

NameDescription
useSupport= true, if support flange enabled, otherwise implicitly grounded

Connectors

NameDescription
flangeFlange of component
supportSupport/housing of component

Modelica.Mechanics.Translational.Interfaces.PartialTwoFlangesAndSupport Modelica.Mechanics.Translational.Interfaces.PartialTwoFlangesAndSupport

Partial model for a component with two translational 1-dim. shaft flanges and a support used for graphical modeling, i.e., the model is build up by drag-and-drop from elementary components

Information

This is a 1-dim. translational component with two flanges and a support/housing. It is used e.g., to build up parts of a drive train graphically consisting of several components.

If useSupport=true, the support connector is conditionally enabled and needs to be connected.
If useSupport=false, the support connector is conditionally disabled and instead the component is internally fixed to ground.

Parameters

NameDescription
useSupport= true, if support flange enabled, otherwise implicitly grounded

Connectors

NameDescription
flange_aFlange of left end
flange_bFlange of right end
supportSupport/housing of component

Modelica.Mechanics.Translational.Interfaces.PartialRigid Modelica.Mechanics.Translational.Interfaces.PartialRigid

Rigid connection of two translational 1D flanges

Information

This is a 1-dim. translational component with two rigidly connected flanges. The fixed distance between the left and the right flange is defined by parameter "L". The forces at the right and left flange can be different. It is used e.g., to built up sliding masses.

Parameters

NameDescription
LLength of component, from left flange to right flange (= flange_b.s - flange_a.s) [m]

Connectors

NameDescription
flange_aLeft flange of translational component
flange_bRight flange of translational component

Modelica.Mechanics.Translational.Interfaces.PartialCompliant Modelica.Mechanics.Translational.Interfaces.PartialCompliant

Compliant connection of two translational 1D flanges

Information

This is a 1D translational component with a compliant connection of two translational 1D flanges where inertial effects between the two flanges are not included. The absolute value of the force at the left and the right flange is the same. It is used to built up springs, dampers etc.

Connectors

NameDescription
flange_aLeft flange of compliant 1-dim. translational component
flange_bRight flange of compliant 1-dim. translational component

Modelica.Mechanics.Translational.Interfaces.PartialCompliantWithRelativeStates Modelica.Mechanics.Translational.Interfaces.PartialCompliantWithRelativeStates

Base model for the compliant connection of two translational 1-dim. shaft flanges where the relative position and relative velocities are used as states

Information

This is a 1-dim. translational component with a compliant connection of two translational 1-dim. flanges where inertial effects between the two flanges are neglected. The basic assumption is that the cut-forces of the two flanges sum-up to zero, i.e., they have the same absolute value but opposite sign: flange_a.f + flange_b.f = 0. This base class is used to built up force elements such as springs, dampers, friction.

The difference to base class "PartialCompliant" is that the relative distance and the relative velocity are defined as preferred states. The reason is that for a large class of drive trains, the absolute position is quickly increasing during operation. Numerically, it is better to use relative distances between drive train components because they remain in a limited size. For this reason, StateSelect.prefer is set for the relative distance of this component.

In order to improve the numerics, a nominal value for the relative distance should be set, since drive train distances are in a small order and then step size control of the integrator is practically switched off for such a variable. A default nominal value of s_nominal = 1e-4 is defined. This nominal value might also be computed from other values, such as "s_nominal = f_nominal / c" for a spring, if f_nominal and c have more meaningful values for the user.

Parameters

NameDescription
Advanced
stateSelectPriority to use s_rel and v_rel as states
s_nominalNominal value of s_rel (used for scaling) [m]

Connectors

NameDescription
flange_aLeft flange of compliant 1-dim. translational component
flange_bRight flange of compliant 1-dim. translational component

Modelica.Mechanics.Translational.Interfaces.PartialElementaryOneFlangeAndSupport Modelica.Mechanics.Translational.Interfaces.PartialElementaryOneFlangeAndSupport

Obsolete partial model. Use PartialElementaryOneFlangeAndSupport2.

Information

This is a 1-dim. translational component with one flange and a support/housing. It is used to build up elementary components of a drive train with equations in the text layer.

If useSupport=true, the support connector is conditionally enabled and needs to be connected.
If useSupport=false, the support connector is conditionally disabled and instead the component is internally fixed to ground.

Extends from Modelica.Icons.ObsoleteModel (Icon for classes that are obsolete and will be removed in later versions).

Parameters

NameDescription
useSupport= true, if support flange enabled, otherwise implicitly grounded

Connectors

NameDescription
flangeFlange of component
supportSupport/housing of component

Modelica.Mechanics.Translational.Interfaces.PartialElementaryOneFlangeAndSupport2 Modelica.Mechanics.Translational.Interfaces.PartialElementaryOneFlangeAndSupport2

Partial model for a component with one translational 1-dim. shaft flange and a support used for textual modeling, i.e., for elementary models

Information

This is a 1-dim. translational component with one flange and a support/housing. It is used to build up elementary components of a drive train with equations in the text layer.

If useSupport=true, the support connector is conditionally enabled and needs to be connected.
If useSupport=false, the support connector is conditionally disabled and instead the component is internally fixed to ground.

Parameters

NameDescription
useSupport= true, if support flange enabled, otherwise implicitly grounded

Connectors

NameDescription
flangeFlange of component
supportSupport/housing of component

Modelica.Mechanics.Translational.Interfaces.PartialElementaryTwoFlangesAndSupport Modelica.Mechanics.Translational.Interfaces.PartialElementaryTwoFlangesAndSupport

Obsolete partial model. Use PartialElementaryTwoFlangesAndSupport2.

Information

This is a 1-dim. translational component with two flanges and an additional support. It is used e.g., to build up elementary ideal gear components. The component contains the force balance, i.e., the sum of the forces of the connectors is zero (therefore, components that are based on PartialGear cannot have a mass). The support connector needs to be connected to avoid the unphysical behavior that the support force is required to be zero (= the default value, if the connector is not connected).

Extends from Modelica.Icons.ObsoleteModel (Icon for classes that are obsolete and will be removed in later versions).

Parameters

NameDescription
useSupport= true, if support flange enabled, otherwise implicitly grounded

Connectors

NameDescription
flange_aFlange of left shaft
flange_bFlange of right shaft
supportSupport/housing of component

Modelica.Mechanics.Translational.Interfaces.PartialElementaryTwoFlangesAndSupport2 Modelica.Mechanics.Translational.Interfaces.PartialElementaryTwoFlangesAndSupport2

Partial model for a component with one translational 1-dim. shaft flange and a support used for textual modeling, i.e., for elementary models

Information

This is a 1-dim. translational component with two flanges and an additional support. It is used e.g., to build up elementary ideal gear components. The component contains the force balance, i.e., the sum of the forces of the connectors is zero (therefore, components that are based on PartialGear cannot have a mass). The support connector needs to be connected to avoid the unphysical behavior that the support force is required to be zero (= the default value, if the connector is not connected).

Parameters

NameDescription
useSupport= true, if support flange enabled, otherwise implicitly grounded

Connectors

NameDescription
flange_aFlange of left shaft
flange_bFlange of right shaft
supportSupport/housing of component

Modelica.Mechanics.Translational.Interfaces.PartialElementaryRotationalToTranslational Modelica.Mechanics.Translational.Interfaces.PartialElementaryRotationalToTranslational

Partial model to transform rotational into translational motion

Information

This is a 1-dim. rotational component with

This model is used to build up elementary components of a drive train transforming rotational into translational motion with equations in the text layer.

If useSupportR=true, the rotational support connector is conditionally enabled and needs to be connected.

If useSupportR=false, the rotational support connector is conditionally disabled and instead the rotational part is internally fixed to ground.

If useSupportT=true, the translational support connector is conditionally enabled and needs to be connected.

If useSupportT=false, the translational support connector is conditionally disabled and instead the translational part is internally fixed to ground.

Extends from Modelica.Mechanics.Rotational.Interfaces.PartialElementaryRotationalToTranslational (Partial model to transform rotational into translational motion).

Parameters

NameDescription
useSupportR= true, if rotational support flange enabled, otherwise implicitly grounded
useSupportT= true, if translational support flange enabled, otherwise implicitly grounded

Connectors

NameDescription
flangeRFlange of rotational shaft
flangeTFlange of translational rod
supportRRotational support/housing of component
supportTTranslational support/housing of component

Modelica.Mechanics.Translational.Interfaces.PartialForce Modelica.Mechanics.Translational.Interfaces.PartialForce

Partial model of a force acting at the flange (accelerates the flange)

Information

Partial model of force that accelerates the flange.

If useSupport=true, the support connector is conditionally enabled and needs to be connected.
If useSupport=false, the support connector is conditionally disabled and instead the component is internally fixed to ground.

Extends from PartialElementaryOneFlangeAndSupport2 (Partial model for a component with one translational 1-dim. shaft flange and a support used for textual modeling, i.e., for elementary models).

Parameters

NameDescription
useSupport= true, if support flange enabled, otherwise implicitly grounded

Connectors

NameDescription
flangeFlange of component
supportSupport/housing of component

Modelica.Mechanics.Translational.Interfaces.PartialAbsoluteSensor Modelica.Mechanics.Translational.Interfaces.PartialAbsoluteSensor

Device to measure a single absolute flange variable

Information

This is the superclass of a 1D translational component with one flange and one output signal in order to measure an absolute kinematic quantity in the flange and to provide the measured signal as output signal for further processing with the Modelica.Blocks blocks.

Extends from Modelica.Icons.TranslationalSensor (Icon representing a linear measurement device).

Connectors

NameDescription
flangeFlange to be measured (flange axis directed in to cut plane, e. g. from left to right)

Modelica.Mechanics.Translational.Interfaces.PartialRelativeSensor Modelica.Mechanics.Translational.Interfaces.PartialRelativeSensor

Device to measure a single relative variable between two flanges

Information

This is a superclass for 1D translational components with two rigidly connected flanges and one output signal in order to measure relative kinematic quantities between the two flanges or the cut-force in the flange and to provide the measured signal as output signal for further processing with the Modelica.Blocks blocks.

Extends from Modelica.Icons.TranslationalSensor (Icon representing a linear measurement device).

Connectors

NameDescription
flange_a(left) driving flange (flange axis directed in to cut plane, e. g. from left to right)
flange_b(right) driven flange (flange axis directed out of cut plane)

Modelica.Mechanics.Translational.Interfaces.PartialFriction

Base model of Coulomb friction elements

Information

Basic model for Coulomb friction that models the stuck phase in a reliable way.

This procedure is implemented in a "clean" way by state events and leads to a mixed continuous/discrete systems of equations if friction elements are dynamically coupled which have to be solved by appropriate numerical methods. The method is described in (see also a short sketch in UsersGuide.ModelingOfFriction):

Otter M., Elmqvist H., and Mattsson S.E. (1999):
Hybrid Modeling in Modelica based on the Synchronous Data Flow Principle. CACSD'99, Aug. 22.-26, Hawaii.

Parameters

NameDescription
Advanced
v_smallRelative velocity near to zero (see model info text) [m/s]
Automatically generated Mon Oct 1 14:51:05 2018.