ADAMS/Chassis Release Notes
version 2005 with Service Pack 2 (APN-150-313)

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Service Pack Enhancements

This Service Pack addresses several problems identified by customers and the ADAMS/Chassis development team. For additional documentation enhancements, see APN-150-313.

30332

The documentation has been enhanced to include an example of using
EPAS steering systems. You can find the information in the
Build tab -> Working with Subsystems -> About Control Subsystems -> EPAS Steering Option.

37228

You can now model trailing arms as flexible components in trailing arm SLA rear suspensions.

37301

Enhanced occupant inertia information capabilities are now available in ADAMS/Chassis. Previously, the inertia information for an occupant was hardcoded.

There is now a capability to change the mass inertia information for occupants in the ADAMS/Chassis interface.

44343

The Export feature in the spline editor was set to systems.tbl directory as default. This has been modified and now the working directory is default.

47265

There was no ability to modify system description for system files. This has been addressed.

49285

A Straight Line Drive Durability Event has been added to ADAMS/Chassis.

The Straight Line Drive Durability event appears under the Full Vehicle->Durability Analyses branch in the event bookshelf. This event has user inputs of vehicle velocity and two options: "Use Vehicle Dynamics Requests" and "Use Traction/Braking Controller".

If the "Use Vehicle Dynamics Requests" is toggled is off, the vehicle dynamics requests will not be present in the dataset and the default SDI plotting will not be available in Review Mode.

If the "Use Traction/Braking Controller" is toggled off, everything related to the traction and braking controller will not be present in the dataset and a dcf file will not be generated.

If this option is chosen, the you are responsible for adding the necessary controller code to the dataset via the Custom ADM Text feature.

Vehicle longitudinal velocities will be set to the user specified value. Wheel rotational
velocities will not be set unless tire models that work in STI are used.

In support of this event, the "ARL Tire Model" option has been added as a new Tire Model option. If this option is selected in the tire subsystem files, tire related statements will not be written to the dataset.

49286

A request to output reaction forces between wheel and spindle joint has been created in ADAMS/Chassis. The request information is shown below:

Column Description
Units
1
 Force along X direction of RM marker
N
2
 Force along Y direction of RM marker
N
3
 Force along Z direction of RM marker
N
4
 Moment about X direction of RM marker
Nmm
5
 Moment about Y direction of RM marker
Nmm
6
 Moment about Z direction of RM marker
Nmm

Example:

REQ/1,FORCE,I=imarker,J=jmarker,RM=rmmarker, C=LEFT FRONT WHEEL SPINDLE FORCE

REQ/2,FORCE,I=imarker,J= jmarker,RM= rmmarker, C=RIGHT FRONT WHEEL SPINDLE FORCE

REQ/31001,FORCE,I= imarker,J= jmarker,RM= rmmarker, C=LEFT REAR WHEEL SPINDLE FORCE

 

REQ/31002,FORCE,I= imarker,J= jmarker,RM= rmmarker, C=RIGHT REAR WHEEL SPINDLE FORCE

Imarker – I marker of wheel spindle joint on wheel part
Jmarker – J marker of wheel spindle joint on spindle part
Rmmarker – Reference marker on spindle part at the location and orientation of CG

49287

There was need for Jounce bumper and Rebound bumper data in a table format in the adm deck. This has been addressed.

Active Jounce/Rebound Bumper parameters table is added to the adm file. If a Rate (linear rate, 2nd order rate, 3rd order rate, damping rate) is represented by a spline, the spline ID is written out in the table.

Example

!==============================================================================================================
!                                   Jounce/Rebound Bumper Parameters
!==============================================================================================================

  
!                                  2ND        3RD    
!                        LINEAR    ORDER      ORDER   BUMPER    FREE      METAL    DAMPING     LOWER         UPPER
!                        RATE      RATE       RATE    HEIGHT   LENGTH     RATE     RATE        ATTACH        ATTACH
!BUMPER PARAMETERS       (N/mm)   (N/mm-mm)   (N/mm3)   (mm)     (mm)     (N/mm)   (N-s/mm) 
!-------------------------------------------------------------------------------------------------------------- 
!FRONT Left  Jounce       ------Spl_112871---------    48.0     N/A     1000000.0   0.0         LOWER STRUT  Upper Strut
!FRONT Right  Jounce      ------Spl_114872---------    48.0     N/A     1000000.0   0.0         LOWER STRUT  Upper Strut
!FRONT Left  Rebound      160.0   10.0         0.0     7.0      89.0    1000000.0   0.0         LOWER STRUT  Upper Strut
!FRONT Right  Rebound     160.0   10.0         0.0     7.0      89.0    1000000.0   0.0         LOWER STRUT  Upper Strut

49291

New Static Loadcase Event Enhancements have been added to ADAMS/Chassis for this Service Pack. Enhancements include:

  1. The default ramp up time for the event has been changed to 5 sec.
  2. The default simulation end time has been changed to 6 sec.
  3. The default simulation steps has been changed to 200.
  4. Simulation end time, ramp up time and simulation steps have been added as interface parameters to the event page.

49760

A Parameters tab was needed for all the property files to help with customization. This has been added to the Service Pack.

49851

Common licensing between ADAMS/Car and ADAMS/Chassis is now working. There were two issues that have been resolved.

  1. With only an ADAMS/Chassis license (plus Full Sim and Tire Handling), a user could not run a full vehicle event because the ADAMS/Chassis package lacked the ADAMS_CAR_SUSPEN key that ADAMS/Car uses for Full-Vehicle Events.
  2. With this same license, a user could not run any ADAMS/Chassis Half-Vehicle events because all ADAMS/Chassis events require the ADAMS_CAR_SUSPEN.

This issue has been resolved. If you encounter this problem, please request a new license key from your sales administrator.

49935

Support for SmartDriver options in XML event file interface.

A series of parameters have been added to the XML file in order to allow finer tuning of the Driving Machine. A list of parameters, possible values, default value (indicated by squared brackets) and brief description follows:

RaxSaturation: [true]/false Enables the saturation of the required longitudinal acceleration when the maximum engine torque is already applied and more acceleration is required. This feature is designed to reduce the throttle overshoot.
TireFzControl: [true]/false Enables the check on tire vertical forces. When the option is set to true and the rear tires normal force is 0, the controller reduces the control actions on throttle/brake to bring the rear tires back in contact with the road.
FeedForward: [true]/false Enables the feed-forward part of the longitudinal controller. Turning off the feed-forward is typically useful for debugging purposes or for forcing the controller response to be slow.
KickdownControl: [false]/true Enables the kick-down controller mode to change gears for faster acceleration. This feature will be available in a future release.
MinPreviewDistance: value [length], default 5[m] This is the saturation value for preview distance computation. It should be greater than the vehicle wheelbase. It should be set to a reasonable value in order to prevent the preview distance from becoming too small during low-speed maneuvers.
ThrottleControl: [on]/off When this option is set to ON, the controller is configured for open-loop throttle mode so that if a gearshift process starts, the controller will step the throttle demand to 0 until the gear shifting is completed. Otherwise, the open loop input to the throttle is not modified during shifting.

With ADAMS/Chassis 2005 Service Pack 1 (APN-150-313), you can now define each parameter in the controller block (tag). Note that the Event Builder interface does not expose these parameters; this must be manually added in the XML Event file. Learn more about the Event Builder.

50358

New functionality that allows you to copy and rename a database has been added.

The Copy and Rename Database utility allows the user to copy a vehicle database (.vdb) to an arbitrary destination location while renaming a registered database tag (mdids://<name>) in all .xml files during the process.

The input fields are:

  • Source Database
  • Destination Database
  • Old Registered Database Name
  • New Registered Database Name

When the source database is selected, the old registered database name gets filled by default using the source database base name. The new registered database gets cleared when the source database is selected.

If the destination database is selected using the selection dialog, the new registered database field gets filled in by default.

If the destination database entry is typed in (not using the selection dialog), the new registered database is left blank.

If the new registered database is blank when the Copy and Rename Database button is pressed, the default is assumed and used based on the destination database base name.

The Copy and Rename Database process will overwrite the existing destination database. A warning is presented if the destination database already exists.

If you have multiple registered databases within a vehicle database you want to copy and rename, it is recommended that you iteratively copy the vehicle database changing one registered database at a time. Source -> Destination, Destination -> New_Destination, New_Destination -> New_Destination2, and so on.

51194

k-fraction damping force in XML-based bushing formulation does not work.

Previously, changing the value of the k-fraction damping factors did not cause a change in the damping force. This problem has been addressed in ADAMS/Chassis 2005 Service Pack 1 (APN-150-313). Now the viscous component of the bushing force is correctly calculated when k-fraction damping is used.

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What's New in ADAMS/Chassis 2005

The 2005 release of ADAMS/Chassis includes all of the fixes and enhancements that were provided in the 2003 Service Pack. See ADAMS/Chassis 2003 Service Pack APN-130-242.

New Alignment Options

You now have the option to specify whether to include loading (cargo and passengers) during alignment. In the loading subsystem, there is now an additional column called Include During Alignment that allows you to individually select what you want included.

Beam Element Stabilizer Bar Scale Factor for Model Correlation

A material scaling factor for the stabilizer bar has been added to the stabilizer bar tab.

Eigenvector Analysis and Animation

A new event that produces eigenvectors and the various energy tables for a given ADAMS/Chassis model has been added to the standard set of events in Test mode.

Steering Linkage Toggle Angle Plots

Steering linkage toggle angles versus steering angle are now a standard plots when using the standard front steering event postprocessing in Review mode.

Cab and Pickup Box Modeling Options

You can have any combination of flexible and rigid parts to represent the cab, pickup box, and frame. These options are available in the body subsystem.

RPC Damper

A new damper type is available that allows you to represent a damper from force vs deflection data generated from an RPC file.

Documentation Enhancements

ADAMS/Chassis Documentation Enhancements

The documentation has been updated to include interface and functionality changes, and information on the 3D Smooth Road event.

You can now directly access help for events in Test and Review modes.

To access event help:

  • In the bookshelf or treeview, right-click an event, and then select Event Help.

F1 help has been created for the following:

  • Load Case Data File Editor
  • Preferences
  • Database Utilities
  • Dynamic Loadcase Fingerprint Generator

In addition, the following CRs were closed during this development cycle:

  • 26847 - How to add alternative camber alignment for the autoaligner.
  • 30068 - ADAMS/Controls integration with ADAMS/Chassis.
  • 40550 - "Create Backup Files" option in the Preferences.
  • 43439 - Issues regarding spaces in directory or file names.
  • 43869 - Left and Right Requests at connectors option in the Connectors tab.
  • 44240 - REQSUB 1137 is now documented.
  • 44304 - Hub compliance documentation was enhanced.
  • 44379 - References and examples to ADAMS/Pre datafiles.
  • 46303 - Custom Event documentation enhanced.

Overall Documentation Improvements

For MSC.ADAMS 2005, we've made improvements to the MSC.ADAMS help:

  • Added global search so you can search across the entire set of MSC.ADAMS help. To access the global search, do one of the following:

    • At the top of the help, select Switch Products, and then select the Search tab.

    • In any product, select the Search tab, and then in the window that appears, select Global Search.

    Note that the global search does not include any .pdfs (including getting started guides and ADAMS/Driver).

  • Removed any hardcoding of font sizes so you can scale the text of the help to any size. Please note that many of the equations do not scale because they are images, and the help looks the best when viewed with medium (or 100%). In addition, your browser will print the text the same size as it is displayed.

  • Documented many of the environment variables for the products to help customize your session. The environment variables are for ADAMS/Controls, ADAMS/Durability, ADAMS/Flex, ADAMS/Solver, ADAMS/View, and the template-based products (ADAMS/Aircraft, ADAMS/Car, ADAMS/Driveline, ADAMS/Rail). For more information, see the Running and Configuring help.

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Changes

Front 4 Link Suspension changes

Front 4-link suspension, with option to leave out upper arms, now allows for two bushings on the lower arm at the axle.

More Subframe Bushings Available

The number of subframe mounts has been extended to eight for both front and rear.

Location Method for Outer CV Joints in the Powertrain Subsystem

Previously, by default, the outer CV joint (Pt 21) was located by ADAMS/Chassis at the front spindle alignment point of the front suspension (Pt 11). In order to simplify modeling of the halfshafts, an additional parameter was implemented that allows you to locate the outer CV joint along the axis (Pt9-Pt11). This parameter defines the distance between the wheel center and outer CV joint.

In the powertrain subsystem, if the parameters are set to no (0), then the code will revert back to pt11 for the CV location. If the parameters are yes (1), ADAMS/Chassis computes the appropriate vector using the distance parameter values. This was implemented for both front and rear halfshafts.

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Issues Resolved for the Service Pack

43067

When using two coil springs for a suspension, the standard requests for spring motion
ratio were writing only the 2nd pair of springs. This has been resolved. In addition, requests for a 2nd pair of shocks and air springs were also added. Note that these
requests will work only for suspension analyses.

46510

Publish database now publishes user-defined parameters such as hardpoints, connectors, construction options, and so on.

47167

A conflict in the wheel center rise definition has been corrected. Wheel center rise is the difference in wheel center height, measured with respect to the body, between design position and static equilibrium position. Positive rise means the static wheel center position is in rebound. Note that Wheel Center Rise is also "Rise-To-Curb" for vehicles described with curb weight loading.

47360

Many ADAMS/Chassis events had difficulty reaching static equilibrium when running with a full-powertrain model. The message "Solution not Converged in Newton Loop for Spline 2000" error was shown. This has been fixed.

47964

A problem with rear quad link UCA and sla inv LCA suspension with construction option 3 for upper control arm has been fixed. The method files have been modified to use the "front_uca" and "rear_uca" part names, and the map file has been modified to account for pt7 and pt17 properly.

48214

The Stabilizer Bar connector location is now displayed.

48527

Bushing preload torques are now included for all bushings and the inconsistencies convention for z-axis direction have been resolved. Previously there were two issues:

  1. Some bushings in some suspensions receive no preload torque at all.
  2. Other bushings were getting preload torques with wrong direction, due
    to user defined ZP pointing in the incorrect direction.

48897

The varsub 1106 now works with reqsub 1129.

48989

SI2 is no longer written out as default integrator for the dynamic load case event. You can explicitly set the integrator to SI2 if needed.

49065

In the ADAMS/Chassis interface, if a damper property file had no Connectors then the Connectors tab was not shown in the damper editor and you could not add additional Connectors. This has been fixed by adding a place holder connector called 'damper_placeholder' to the damper property file during the update process.

49089

The varsub 1106 now works for reqsub 1102.

49119

The Delete option has been added to all the table editors. Delete option is available only for user-defined entities.

49150

A problem with using personal files with the vedyna translator event was fixed.

49274

Running a Linear analysis after a static analysis now enabled.

ADAMS/Chassis 2005 Service Pack 1 (APN-150-313) allows you to run a linear analysis
after the static analysis. This functionality was not available in the 2005 release.
Solver commands can be added to the .acf files between mini-maneuvers to do Linear analyses.

49423

A problem with an incorrect rise-to-curb part ID when a non-zero rise-to-curb was present was fixed.

49427

There was an issue with default prefix generated by ADAMS/Chassis in Test Mode. When you added an event from the bookshelf into a fingerprint, Chassis wrote out a default prefix into the Treeview. When the same event was added to a new fingerprint, ADAMS/Chassis wrote the same prefix into the Treeview for the second fingerprint as well.

The fingerprint tree has been enhanced so that any time events are added to it, ADAMS/Chassis will ensure that the name is unique across all events in all fingerprints.

49443

Wheel mass for static loadcase events was set to the original value for all loadcase analyses. Original value should be set only for 1G loadcase analyses. For all other analyses, the value should be 0.1. This issue has been resolved.

49502

The Control system library name written to the GSE interface was based on the control system name. This issue has been resolved. Now the library name is the same as the user-specified name.

49733

When subframe midmounts were specified for a front subframe, the model failed to build. This issue has been resolved.

49817

In slacoil_rear suspensions, the UCA attachment points were incorrectly specified. The
attachments were always on the body. The issue has been resolved. You can now attach the UCA to either the frame or subframe.

49960

Velocity sensor requests didn't account for the Body CM marker. This resulted in the following warning messages:

reqsub>>flt_vehsta: WARNING - Illegal or no units in user request 90.
reqsub>>flt_vehsta: Program will assume English units.

This issue has been resolved.

49999

When the model is updated, the uca_attachment construction option's currentValue field had a value of 2, even though the valid values are 10 and 11, as indicated by the option name IDs in the XML file. This has been fixed.

50024

Parameters from WFT property file were not saved through the interface. This has been fixed.

50063

The issue of front powertrain models with halfshaft compliance failures during builds
has been addressed.

50070

The documentation for Jack force on spindle was incorrect. Units for column 4 was correctly updated to N-mm. Description for column 5 was updated to indicate pitch moment.

50084

For the Instrumentation Subsystem, the Custom ADM test was not written to the dataset. This problem has been resolved

50117

Scaling factors for control subsystem were not saved through the interface. This has been fixed.

50225

A problem with using personal files during Improve mode post processing was fixed. The use personal trigger for post processing files is the same as it is for py files, the event usePersonal attribute. Personal files specified in the current working directory do not work due to the nature of the Improve mode tree structure build process. Personal files in $HOME and/or in a specified directory work fine.

50385

The Body attachment finder utility was failing to report the subframe mid-mount attachments. This problem has been resolved.

50432

A problem with the rdf file specification being lost when switching between two different 3D smooth road events was fixed.

50433

A problem with reloading fingerprint files after issuing a New Session was fixed.

50434

A problem with the name of the preferences file being hardcoded to achassis_defaultPrefs.xml in the session file was fixed. The session file now properly points to the user-supplied preferences file.

50646

For road datafiles, the file browser was not setting the roads.tbl directory as default. This has been fixed.

50718

When aeroforces are turned on, the following warning message appears. The message has no affect on the results.

***WARNING*** ***GFOSUB>>flt_unicon:

Array 97 for Unit Conversion Factors & Vehicle Travel Direction is not
Specified
Results will be in the following Units
Force = N Torque = N-mm
These Units may not be Compatible with Your ADAMS Model
and may Result in the Simulation Failure

The Default Direction of Travel is: -X direction
with the Vertical Z-axis pointing up

This issue has been resolved.

50888

An incorrect build occurred when the body-on-frame option with body mounts selected as fixed joints was selected. Multiple fixed joints were created which resulted in redundant constraints. This issue has been addressed.

Issues Resolved for the 2005 Release

40249

You can now include Alignment settings in your Design of Experiments.

44275

Memory consumption when building multiple models has been fixed.

44192

Makeflex was updated to handle partial invariant sets correctly.

45805

Exporting powertrain subsystems from ADAMS/Driveline to ADAMS/Chassis is now working properly.

46087

Incorrect end times and steps for pulse type input in frequency response event has been resolved.

46856

Parking Effort plotting was missing from Review mode. It has been added.

46671

An issue with duplicate ARRAY IDs being used when including SWIFT Tires has been resolved.

46875

You can now view the model auditor report in Review mode

47726

ADAMS/Chassis was checking out ADAMS_AFC_KERNEL when starting up ADAMS/Chassis and it was checking out ADAMS_AFC_KERNEL more time when running Update 11.0 ADAMS/Pre Datafiles and Fingerprints. This has been resolved.

47884

ACF runner mistakenly had a cap such that after a certain number of simulations it would not run anymore. This has been resolved.

47905

SVC iterate crashes if 'use personal files' was selected. This has been fixed.

48171

Using type 4 (engine and driveshafts) powertrain, in a full-vehicle model with body-on-frame, and the rear dummy subframe turned off, the rear driveshaft inner parts tried to attach to the subframe, instead of the frame. This caused model run failures. This issue has been resolved.

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Copyright © 2005 MSC.Software Corporation. All rights reserved.


Revised: 09/06/05