MotionView
MotionView

2022

  1. Home
  2. MotionView Panels

    Explore the various panels and tools in MotionView.

  3. Modal Forces

    The Modal Forces tool allows you to include a disturbed force on a flexible body that exists in the modal form in the flexible body H3D.

  • What's New
  • Get Started
  • Tutorials
  • MotionView Overview
  • MotionView Menus
  • Project Browser
  • MotionView Panels
  • MotionView CAD Interfacing
  • Flexible Bodies
  • MotionView Solver Interfacing
  • Vehicle Modeling
  • Optimization
  • Functional Mockup Unit (FMU)
  • MotionView Interface with Collaboration Tools
  • Tcl/Tk Reference Guide
  • MDL Reference Guide
  • MotionSolve Reference Guide
  • Templex and Math Reference Guide
  • MotionView Python Reference Guide
  • HyperWorks MotionView Help
Index
MotionView

2022

MotionView
  • What's New

    View new features for MotionView 2022.

  • Get Started

    Learn the basics and discover the workspace.

  • Tutorials

    Discover MotionView functionality with interactive tutorials.

  • MotionView Overview

    MotionView is a general pre-processor for Multi-body Dynamics.

  • MotionView Menus

    Explore the MotionView menus which provide access to the various wizards, dialogs, tools, and panels.

  • Project Browser

    The Project Browser allows you to view the MotionView model structure while providing display and editing control of entities.

  • MotionView Panels

    Explore the various panels and tools in MotionView.

    • MotionView Toolbars

      The MotionView toolbars provide you with quick access to some of the most commonly used panels and tools.

    • Entity Selector

      The Entity Selector allows you to set the graphic screen selection mode.

    • Graphic Entity Attributes

      Model files are composed of many different parts, or entities. MotionView allows you to change the display attributes of each entity in a graphic. Visual properties such as shading, color, and mesh lines can be assigned using the Graphic Entity Attributes panel.

    • Run Solver

      The Run Solver tool allows you to either run the current model or run an existing solver command file generated previously by MotionView.

    • System/Assemby

      The System/Assembly panel allows you to add new systems and assemblies to your model, modify attachments, and set initial conditions and options for systems and assemblies.

    • Analysis

      The Analysis panel allows you to add new analyses to your model, modify attachments, set initial conditions for analyses, and set analyses options.

    • Command Sets

      The Command Sets panel allows you to create command sets for the solver-command file. The command sets for a model are order dependent, since they define the contents of the solver command file.

    • Points

      The Points tool allows you to add points to models and edit point coordinates.

    • Vectors

      Use the Vectors tool to create and edit vectors.

    • Markers

      Use the Markers tool to create coordinate systems and reference frames.

    • Methods of Orientation

      Coordinate systems in MotionView can be oriented using a variety of methods.

    • Curves

      Use the Curves tool to create and edit curves.

    • Deformable Curves

      Use the Deformable Curves tool to create and edit deformable curves.

    • Spline3D

      The Spline3D panel allows you to add and edit three dimensional spline data.

    • Surfaces

      The Surfaces tool allows you to create surfaces for use with advanced joint entities.

    • Deformable Surfaces

      Use the Deformable Surfaces tool to create and edit deformable surfaces. These entities can change shape during the simulation and can be used with advanced joints and contacts.

    • Graphics

      Use the Graphics tool to create and edit visualizations for entities during pre-processing and post-processing.

    • Bodies

      Use the Bodies tool to create and edit rigid, point mass, and deformable/flexible bodies.

    • Joints

      Use the Joints tool to create and edit basic joints.

    • Advanced Joints

      Use the Advanced Joints tool to create and edit a set of special constraints called higher pair joints. Typically, these are constraints that involve a curve or surface on at least one of the two bodies.

    • Couplers

      A Coupler entity defines an algebraic relationship between the degrees of freedom of two or three joints.

    • Gears

      Use the Gears tool to create a gear entity to relate the motion of two joints.

    • Bushings

      Use the Bushings tool to create bushings and edit their connectivity, properties, and orientation rules.

    • General Constraints

      Use the General Constraints tool to create a generic expression based constraint.

    • Fields

      Use the Fields tool to create a compliant connection between two bodies where stiffness or damping in one direction can be a function of displacement in another direction

    • Spring Dampers

      Use the Spring Dampers tool to edit the connectivity, properties, and initial conditions of springs and dampers.

    • Beams

      Use the Beams to create beams and edit their connectivity, properties, and orientations.

    • Polybeams

      Use the PolyBeams tool to create polybeams and edit their points and properties.

    • Motions

      Use the Motions tool to create motions and to edit the initial conditions, displacements, velocities, and acceleration of joints.

    • Forces

      Use the Forces tool to create forces and to edit the orientation and properties of forces.

    • Modal Forces

      The Modal Forces tool allows you to include a disturbed force on a flexible body that exists in the modal form in the flexible body H3D.

    • Contacts

      Use the Contacts tool to specify the attributes of a contact force between two bodies.

    • Outputs

      Use the Outputs tool to create a result output request to the solver, which writes out the requested data for plotting data.

    • Sensors

      Use the Sensors tool to sense an event during simulation and to define a response to that event

    • Control State Equations

      Use the State Equations tool to create and set control state equation data.

    • FMU

      Use the FMU tool to add a Functional Mock-up Unit and connect it to a multi-body model.

    • Templates

      Use the Templates tool to create and edit blocks of text that contain data fields and programming instructions.

    • Forms

      Use the Forms tool to edit general data entry forms.

    • Datasets

      Use the DataSets tool to create and edit datasets comprised of object types, such as real, string, boolean, integer, and options.

    • Solver Variables

      Use the Variables tool to create solver variables that can be used to create an algebraic expression of state variables, as well as other solver variables. This can then be referenced in function expressions throughout the solver input file.

    • Solver Arrays

      Use the Arrays tool to create solver arrays and set solver array data. Solver array types include X array, Y array, U array, IC array, Plant Input array, and Plant Output array.

    • Solver Strings

      Use the Strings tool to create a solver string and set solver string data. A solver string provides a string that can be accessed within the model, for example, to pass into a user subroutine.

    • Control SISOs

      Use the SISOs tool to set control SISO data. This data can be used to add additional states to the mechanical system being modeled.

    • Solver Differential Equations

      Use the Diff Equations tool to set solver differential equations. These equations can be used to add additional states to the mechanical system being modeled.

  • MotionView CAD Interfacing

    MotionView supports the importing of several types of CAD and FE formats.

  • Flexible Bodies

    MotionView has many pre-processing and post-processing capabilities with regards to flexible bodies, or flexbodies, for multi-body dynamics models.

  • MotionView Solver Interfacing

    Solvers and translators supported in MotionView.

  • Vehicle Modeling

    Explore the various vehicle modeling tools.

  • Optimization

    Discover optimization with MotionView, MotionSolve, and HyperStudy.

  • Functional Mockup Unit (FMU)

    Use the FMU tool to add a Functional Mock-up Unit and connect it to a multi-body model.

  • MotionView Interface with Collaboration Tools

    MotionView supports a limited version of interface with HyperWorks Collaboration Tools.

  • Tcl/Tk Reference Guide

    Reference material for the HyperWorks Desktop scripting interface which is a set of Tcl/Tk commands.

  • MDL Reference Guide

    Reference materials for the MotionView MDL Language, Tire Modeling, and the MDL Library.

  • MotionSolve Reference Guide

    Reference material detailing command statements, model statements, functions and the Subroutine Interface available in MotionSolve.

  • Templex and Math Reference Guide

    Reference material for Templex (a general purpose text and numeric processor) and additional mathematical functions and operators.

  • MotionView Python Reference Guide

    Reference materials for the MotionView Python Language.

  • HyperWorks MotionView Help

    MotionView help for HyperWorks.

View All Altair Simulation Help

MotionView
MotionView

2022

  1. Home
  2. ...
    • MotionView Panels

      Explore the various panels and tools in MotionView.

  3. Modal Forces

    The Modal Forces tool allows you to include a disturbed force on a flexible body that exists in the modal form in the flexible body H3D.

  • What's New
  • Get Started
  • Tutorials
  • MotionView Overview
  • MotionView Menus
  • Project Browser
  • MotionView Panels
  • MotionView CAD Interfacing
  • Flexible Bodies
  • MotionView Solver Interfacing
  • Vehicle Modeling
  • Optimization
  • Functional Mockup Unit (FMU)
  • MotionView Interface with Collaboration Tools
  • Tcl/Tk Reference Guide
  • MDL Reference Guide
  • MotionSolve Reference Guide
  • Templex and Math Reference Guide
  • MotionView Python Reference Guide
  • HyperWorks MotionView Help
Index

ON THIS PAGE

  • Create Modal Forces
  • Edit Modal Forces
    • Define the Connectivity of Modal Forces
    • Define the Properties of Modal Forces
    • Use User-Defined Properties for a Modal Force

Modal Forces

The Modal Forces tool allows you to include a disturbed force on a flexible body that exists in the modal form in the flexible body H3D.

Create Modal Forces

  1. From the Project Browser, select the system to which the Modal Force entity is to be added.
  2. Right-click on a system in the Project Browser and select Add > Force Entity > ModalForce from the context menu.
    OR
    Right-click on a modal force folder in the Project Browser and select Add ModalForce from the context menu.
    OR
    Right-click the Modal Force button on the Force toolbar.
    The Add ModalForce dialog is displayed.
  3. Specify a label for the force.
  4. Specify a variable name for the force.
    By default, variables names of entities in MotionView follow a certain convention. For example, all modal force entities have a variable name starting with “mfrc_”. This is the recommended convention to follow when building models in MotionView since it has many advantages in model editing and model manipulation.
  5. Click OK to close the window or Apply to continue creating entities.
    Note: In order to add a distributed force on a flexible body, the force needs to be included in the flexible body H3D during the CMS flex body generation process. The force can be a generic force on a set of nodes, or a pressure load on a set of elements or a thermal loading.

    Once the force is available in the flexible body, the force can be scaled with regard to time or a solver function expression using the Properties tab.

    Once a modal force entity has been added to the model, the panel for the force will automatically be displayed in the panel area.

Edit Modal Forces

Define the Connectivity of Modal Forces

From the Connectivity tab, select the flexible body on which the distributed force should be applied.

  1. If the Modal Force panel is not currently displayed, select the desired modal force by clicking on it in the Project Browser or in the modeling window.
    The Modal Force panel is automatically displayed.
  2. Click the FlexBody collector and select the flexible body on which the distributed force is to be applied from the modeling window, or double click the collector to open the Model Tree (from which the desired body can be selected).
  3. Select the force type from the drop-down menu.
    For the MotionSolve solver mode, this force can be applied only as an action only force. For the ADAMS solver mode, the force can also be applied as action reaction. In this case, an additional option to specify a rigid body as reaction body is available.
  4. If Action Reaction is chosen as the force type, click the RigidBody collector and select a rigid body as a reaction body for the distributed force from the modeling window or Model Tree.

Define the Properties of Modal Forces

From the Properties tab, the load case that is available in the flexible body H3D can be selected and a scale factor can be applied.

  1. Select the method of scaling for the modal force from the drop-down menu.
    If Linear is chosen, enter a real number in the value field to specify the constant scale.
    If Curve is chosen, define the scale in the form of a curve.
    1. Select AKIMA, CUBIC, LINEAR , or QUINTIC under Interpolation as the method of interpolation of between two data points on the curve.
    2. Enter a value under Independent variable.
    3. Resolve the curve by double-clicking the Curve collector and selecting a curve from the Select a Curve dialog.
      Note: To use a curve, you first need to define a curve using the Curves panel.
    If Spline3D is chosen, define the scale as a function of two independent variables in the form of a three dimensional spline data.
    1. Select AKIMA, CUBIC, LINEAR , or QUINTIC under as the method of interpolation of values between 2 data points in XY plane.
      The interpolation choices are applicable to Independent variable X only. Data along Independent variable Z is linearly interpolated.
    2. Resolve the 3D spline by double-clicking on the Spline3D collector and selecting a Spline3D entity from the Select a Spline3D dialog.
      Note: To use a Spline3D entity, you first need to define a spline using the Spline3D panel.
    3. Specify an expression for Independent variable X and Independent variable Z.
    If Expression is chosen, define the scale in the form of a solver function.
  2. Select the load case from the drop-down menu.
    The list contains the load case id as available in the flexible body H3D. Load case ID generally matches with the ID specified in the finite element deck (.fem in case of OptiStruct) that was used to generate the flexible body.

Use User-Defined Properties for a Modal Force

If desired, define the modal force using the User-Defined tab, which will allow you to specify the properties of the force using user subroutines.

  1. From the Connectivity tab, click the User-defined properties check box.
    The Properties tab is removed.
  2. Click the newly added User-Defined tab.
  3. Define the user subroutine.
    1. Provide an expression with the USER solver function with parameters being passed to the user subroutine.
    2. Alternatively, activate the Use local file and function name check box to specify a local file where the subroutine code can be accessed by the solver.
      If this option is not specified, MotionSolve will search for a subroutine following its user subroutine loading rules.
    3. Select a function type from the drop-down menu.
    4. Select the local file for the subroutine.
      The type of file to be specified will depend on the selected function type. For example, if DLL/SO is selected, you can specify a file with a .dll extension (for Windows) or an .so extension (for Linux).
    5. Specify the function name in the subroutine that defines the entity, or accept the default name provided by MotionView.
See Also
Force_FlexModal (MotionSolve XML Statement)

ON THIS PAGE

  • Create Modal Forces
  • Edit Modal Forces
    • Define the Connectivity of Modal Forces
    • Define the Properties of Modal Forces
    • Use User-Defined Properties for a Modal Force

© 2022 Altair Engineering, Inc. All Rights Reserved.

Intellectual Property Rights Notice | Technical Support