Home
Multibody Modeling
MotionView is a general pre-processor for Multibody Dynamics.
Vehicle Modeling
Explore the various vehicle modeling tools.
1D Vehicle System Models
Disk Brakes
Structure

Welcome
What's New
View new features for Altair HyperWorks 2024.1.
Get Started
Learn the basics and discover the workspace.
Tutorials
Learn more about the Altair HyperWorks suite of products with interactive tutorials.
Startup Procedures and Customizations
Start and configure the applications.
Tool Finder
View a list of deprecated panels and their newer, equivalent workflows.
Manage Files and Data
Create, open, import, and save models.
Sessions and Report Templates
Set up sessions and create report templates.
Interface with External Products
Solver interfaces supported in HyperMesh.
Entities and Solver Interfaces
A solver interface is made up of a template and a FE-input reader.
Browsers
Browsers provide a structured view of model data, which you can use to review, modify, create, and manage the contents of a model. In addition to visualization, browsers offer features like search, filtering, and sorting, which enhance your ability to navigate and interact with the model data.
Sketching
Create and edit 2D parametric sketch geometry.
Topology
Create, edit, and cleanup geometry.
FE Geometry
FE geometry is topology on top of mesh, meaning CAD and mesh exist as a single entity. The purpose of FE geometry is to add vertices, edges, surfaces, and solids on FE models which have no CAD geometry.
Meshing and Elements
Explore the different types of mesh you can create in HyperMesh and create and edit 0D, 1D, 2D, and 3D elements.
Model Build and Assembly
Create, organize and manage parts and subsystems.
Composites
HyperMesh composites modeling.
Connectors
Create connections between parts of your model.
Morph
Rapidly change the shape of the FE mesh without severely sacrificing the mesh quality.
Skeleton Modeling
Create a reduced ordered model to facilitate optimization at the concept phase.
Design Space
Workflow to support topology optimization model build and setup.
Optimization
Setup an Optimization in HyperMesh.
Design Explorer
Multi-disciplinary design exploration and optimization tools.
Validate
Validate the model built before running solver analysis.
Analyze
Models require loads and boundary conditions in order to represent the various physics and/or physical equivalents to bench and in-use testing.
Axisymmetry
Reduce a full 3D model with axisymmetric surfaces while accounting for imperfections.
Concept Modeling
Tools and workflows that are dedicated to rapidly creating new parts for specific use cases, or amending existing parts. The current capabilities are focused on stiffening parts.
Crash and Safety
Tools used for crash and safety analysis.
Airbag
Use airbag folder utilities and export a resulting airbag in a Radioss deck.
Aerospace
Essential utility tools developed using HyperMesh-Tcl.
Aeroelasticity
Import an aeroelastic finite element model with Nastran Bulk Data format.
Certification
Framework to plug certification methods to assess margin of safety from the model and result information.
PhysicsAI
Use PhysicsAI to build fast predictive models from CAE data. PhysicsAI can be trained on data with any physics or remeshing and without design variables.
Results Data
Results data can be post-processed using both HyperMesh and HyperView.
Developer
The Developer ribbon contains tools for automation and customization.
Plot Data
HyperGraph is a data analysis and plotting tool with interfaces to many file formats.
Multibody Modeling
MotionView is a general pre-processor for Multibody Dynamics.
- MotionView Overview
  MotionView is a general pre-processor for Multibody Dynamics.
- Model Browser
  The Model Browser allows you to view the MotionView model structure while providing display and editing control of entities.
- MotionView Ribbons
  The MotionView ribbons allows you to quickly access tools and standard functions, and is located along the top of MotionView.
- 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 multibody dynamics models.
- Functional Mockup Unit (FMU)
  Add an FMU to the model or export a model as an FMU.
- Vehicle Modeling
  Explore the various vehicle modeling tools.
- Tcl/Tk Reference Guide
  Reference material for the 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.
Media Files
MediaView plays video files, displays static images, tracks objects, and measures distances.
Tabulate Results
Use TableView to create an Excel-like spreadsheet.
Text Files
TextView math scripts reference vector data from HyperGraph windows to automate data processing and data summary.
Publishing and Reporting
Create, define, and export reports.

View All Altair HyperWorks Help

Structure

The structure of the Disk Brake system can be displayed by expanding the folder in the MotionView Model Browser:

Figure 1. Brake Disk System in MotionView

Datasets

Table 1. Brakes System Information Dataset
Parameter	Type	Range	Comments
Pedal Ratio	Real	Value > 0	Refer to the Pedal Box schematic.
Front master cylinder piston area (mm2)	Real	Value > 0	P_Front = K_{Brake boost} * F_Front/Area_{MC_front}
Rear master cylinder area (mm2)	Real	Value > 0	P_Rear = K_{Brake boost} * F_Rear/Area_{MC_rear}
Maximum pedal force (N)	Real	Value > 0	Maximum pedal force exerted by the driver.
Brake demand scaling factor	Real	Value > 0	Brake demand corresponding to 100% braking.
Brake Boost Ratio	Real	Value > 0	P_{Brake line} = K_{Brake boost} * P_MC Variable brake boost ratio can be set using the solver variable Brake boost ratio.

Table 2. Front Disk Brakes\Datasets\Disk Brakes Info
Parameter	Type	Range	Comments
Left Disk effective radius (mm)	Real	Value > 0	Refer to the Brake Disk schematic.
Right Disk effective radius (mm)	Real	Value > 0	Default value = Left Disk effective radius
Left piston area	Real	Value > 0	Left brake calliper piston area. If: No. of pistons = N. Expected value = N*Area of 1 piston
Right piston area	Real	Value > 0	Default value = Left piston area
Left pad coefficient of friction	Real	Value > 0	Coefficient of friction between left brake Disk and left brake calliper pads.
Right pad coefficient of friction	Real	Value > 0	Default value = Right pad coefficient of friction
Stiction omega (rad/s)	Real	Value > 0	Angular velocity of the brake Disk above which maximum braking force is applied. Refer to the Friction Force versus Wheel Angular Speed schematic.

Rear Disk Brakes\Datasets\Disk Brakes Info: Similar to Front Disk Brakes Info (listed above)

Solver Variables


Solver Variable	Comments
Front brake line pressure	Computes pressure in front brake line. P_Front = K_{Brake boost} * F_Front/Area_{MC_front}
Rear brake line pressure	Computes pressure in front brake line. P_Rear = K_{Brake boost} * F_Rear/Area_{MC_rear}
Brake bias (forwards)	User defined solver variable. F_Front = BB * F_MC
Brake boost ratio	User defined solver variable. P_{Brake line} = K_{Brake boost} * P_MC Default brake boost ratio is a user defined constant in the Brake system info dataset.
Driver brake demand	User defined solver variable. If used in an analysis (a driving analysis for example), analysis is expected to override this solver variable.

Torque

Front Disk Brakes\Forces\Brake Torque Info: Action reaction torque between knuckle and wheel hub at the wheel center.; Direction is opposite to the angular velocity of the wheel hub.; Torque magnitude is calculated according to the following equation: Friction torque on the brake Disk = F_fr * Effective Radius_{Brake Disk}
Rear Disk Brakes\Forces\Brake Torque Info: Similar to the Front Brake Torque Info (above)