Customer PTC E-Newslettersupport.ptc.com/carezone/archive/newsletters/103105_a… ·  · 2005-11-03Pro/ENGINEER Wildfire 2.0 Mechanisms & Mechanism ... mechanism analysts and designers

PTC Technical Specialists E-Newsletter Date: October 31, 2005

B) Using Configuration Management Early in Design

ips of the Week: A) Applying Fastener Connections for Structural Simulation

B) Cloning a Windchill Server

Announcements: Most Recent Announcements

Upcoming Events & Training Schedule: Events & Training Schedule

PTC Product Focus

What’s New in Motion for Wildfire 2.0 Pro/ENGINEER Wildfire 2.0 Mechanisms & Mechanism Dynamics has taken motion to a new level. With the retirement of Mechanica Motion most functions are now fully integrated with Pro/ENGINEER Wildfire 2.0. With the easy to use interface and powerful capabilities almost any rigid body motion can be modeled. Engineers need not wait for physical prototypes to test a product’s dynamic endurance and motion. With Pro/ENGINEER Mechanism Dynamics, you can virtually simulate reactions to accelerations and the weight of moving components. And, you can adjust product performance by incorporating dynamic influences such as springs, motors, friction, and gravity. Maximize design confidence without the expensive burden of building prototypes.

Sub-Mechanism Edit Users will be able to directly Edit the Mechanism characteristics of a lower level subassembly by simply activating it from a higher level assembly model in session, consolidating model interaction and access within a single working window.

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Expanded Connection Library The library of Connections will be expanded to include a generalized type of connection that can represent any combination of degrees of freedom and enable modeling of U-joints, Free joints (6 controllable degrees of freedom), or any other specialized joint type. With a connection conversion now possible for any combination of assembly constraints, preparing an assembly for detailed kinematic and dynamic simulation is easier than ever.

Anytime Component Drag

Kinematic Dragging of packaged Components will enable virtual interaction with movable mechanical assemblies at anytime while in assembly mode. Preparing mechanism connections and entering a separate Mechanism simulation application mode will no longer be a necessary requirement to simply drag a component or readjust an interconnected mechanism into a new configuration. Implied joints will be derived for any under constrained component, and the assembly may be manipulated about the screen, repositioned in real-time, and seamlessly utilizing the underlying kinematic solution technology of Mechanism Design. Joint and Slot Friction Joint Axis and Slot Friction will provide the ability to specify static and kinetic friction coefficients on rotation and translational joint axes, as well as, tangentially along a 3 dimensional slot curve enabling accurate simulation of real world dynamic effects.

Customer PTC E-Newsletter 10/31/2005 Page 2 of 19

Enhanced Load Expressions Load Expression input is enhanced to allow specification complex force and motor profiles that incorporate multiple measures as variables and measures of any evaluation method (integral, minimum, maximum, RMS, etc.) This makes it possible to quickly and easily simulate mechanisms governed by intelligent PID controllers or advanced nonlinear spring and damper systems

Customer PTC E-Newsletter 10/31/2005 Page 3 of 19

Additional Measure Types The existing set of Measure Types for such results as position, velocity, reaction force, etc. will be expanded to include new system and cam measurements as well as a customizable measure type defined using a desired expression.

Point-to-Point Separation Measure and Forces Mechanism Dynamics supports the ability to define point-to-point separation measures and forces, which match the functionality of Mechanica Motion. You can generate expanded results for Mechanism Dynamics for accurate measurement of the separation distance, speed, and dependent forces, such as nonlinear springs and dampers.

Point-to-Point Separation Measure allows you to capture separation distance, velocity, and acceleration between two points. You can specify force expressions dependent upon point-to-point separation, velocity, and acceleration. Currently, the creation of a point-to-point distance measure is only provided through BMX.

Forces can now be defined at a point relative to a coordinate system, on a joint axis, or as linear springs. Point-to-point forces enable generalized separation distance for dependent forces, such as nonlinear springs, nonlinear dampers, and magnetic forces that accept both table input and user-defined expressions.

Customer PTC E-Newsletter 10/31/2005 Page 4 of 19

Cam Measures for Mechanism Curvature, Pressure Angle, and Slip Velocity have been added to the measures commands to expand the results available for examining cam connection, kinematic behavior.

Customer PTC E-Newsletter 10/31/2005 Page 5 of 19

Custom Load Toolkit A Custom Load Toolkit will provide the basic interface and functions to allow advanced mechanism analysts and designers to program their own complex loading model using Pro/TOOLKIT and incorporate this loading model as a linked library within a dynamic mechanism analysis. This will enable simulation of an unlimited range of complex behaviors such as force based gear systems, belts driven by flexible pulleys, linear beam and truss elements, tire models, etc.

Dynamic Load Transfer for Structural Analysis Dynamic Load Transfer to Pro/ENGINEER Structure and Thermal (formerly Pro/MECHANICA) integrates dynamic motion simulation with structural analysis by providing the ability to save joint and inertial loading information at a particular motion analysis time step. The load information is saved to a component and is immediately available for use in structural stress and displacement analysis. Mechanism simulation is already integrated with Design Animation and Behavioral Modeling, soon appropriate dynamic motion results can be leveraged for structural simulation as well.

Customer PTC E-Newsletter 10/31/2005 Page 6 of 19

To find out more about Pro/ENGINEER Mechanism Dynamics visit our Website

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PTC Product Focus

Using Configuration Management Early in Design

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Customer PTC E-Newsletter 10/31/2005 Page 7 of 19

Tips of the Week

Applying Fastener Connections for Structural Simulation

With Pro/Engineer Wildfire 2.0 Structural Simulation we can add Fastener Connections. It will provide assembly connectivity/load transfers and provides baseline connection design feedback. It will not look for stresses in the bolt themselves (such as at bolt shoulder stresses). Described below is a quick description how to apply bolted connections and how to interpret the results. The following 3 types of bolts can be defined

1. Screw Fastener

2. Through Bolt in Solids

3. Through Bolts in Shells Additional settings allow for basic and advanced bolts. Stiffness for basic bolts is defined by material and diameter. Advanced bolts support the following attributes;

• Advanced Bolts support Preload

• Bolt Stiffness may be defined using a bolt diameter and material property or by specifying a spring stiffness property (Kxx is axial, Kyy=Kzz is normal)

• Bolt Specific Measures Automatically created

o Tensile Force (Only if Preload is defined)

o Tensile Stress (Only if Preload is defined)

o Shear Force

o Shear Stress

o Separation Area Stress – If “Fix Separation” is set, let’s you know if the bolt is in tension. More details in Screw Fastener Description

• Rotational degree of freedom along the bolt axis may be specified as free or fixed

• Shear stiffness may be disabled

The following is a description on how the different types of bolt connections are defined.

Screw Fasteners (Blind Bolts)

• are fasteners where the bolt holds two components together, with the fastener threaded into one of the two components

Customer PTC E-Newsletter 10/31/2005 Page 8 of 19

• The references are the edges of the two holes in the components to be joined

First Edge

Second Edge

• The “head” of the bolt is created where the first curve is selected

• The second curve selected is the “top” of the hole the bolt threads into

• The two parts may be touching (no gap) and a “free connection” will be automatically added at the interface to keep them from merging

Bolt Fasteners in Solids (Through Bolts)

• bolt fasteners (through bolts) are fasteners that connect two components together, with a bolt and a nut.

Customer PTC E-Newsletter 10/31/2005 Page 9 of 19

• The references are the edges of the two holes in the components to be joined

o The “head” of the bolt is created where the first curve is selected

o The second curve selected is where the nut rests against the second component

First Edge

Second Edge

• The two parts may be touching (no gap) and a “free connection” will be automatically added at the interface to keep them from merging

Bolt Fasteners in Shells

• Bolt fasteners (through bolts) are fasteners that connect two components together, with a bolt and a nut in shell models (quilts or models that will be mid-surface-compressed)

Customer PTC E-Newsletter 10/31/2005 Page 10 of 19

• The references are the points

o Selection order is not important

First Point

Second Point

• There must be a gap between the parts if they are quilts; fasteners cannot be zero-length Example: In the following example we want to add screw connections to these flanges.

Customer PTC E-Newsletter 10/31/2005 Page 11 of 19

In this case we can apply cyclic symmetry and mirror symmetry since the assembly is axially symmetric and the blue pipe is also symmetric about the center plane.

Here a pressure load of 10 N/mm2 is applied to the inside surface of the ‘pipe’.

Customer PTC E-Newsletter 10/31/2005 Page 12 of 19

Now the bolt fastener can be applied to the hole. The icon looks like this; We will select a simple bolt fastener first. Notice how the outside edges of the hole going thru the 2 parts are selected. In this case this is a bolt and nut fastener in a thru hole.

Bolts have a dedicated icon as seen here. When we apply the mesh, you can see how it is mapped to the bolt geometry. This enables the program to do a “compression” only contact analysis where the bodies meet.

At this stage the analysis is ready for a static analysis run. As we see from the results the stress is mainly concentrated in the fillet and not the bolt hole. This is due to the fact that there is no preload in the bolt.

Customer PTC E-Newsletter 10/31/2005 Page 13 of 19

Now the bolt will be modified to an advanced bolt so preload can be included. In this case the preload force will be 40000 N. The Fastener and Nut diameter can also be adjusted. The option to fix rotation is also available. Note: Advanced bolts are only available with the Advanced Structure and Thermal license.

The results show the stress is concentrated around the bolt hole as expected. Also notice the high contact stress and effects of the Head and Nut on two components

Customer PTC E-Newsletter 10/31/2005 Page 14 of 19

For more information consult the Technical Support web site Using Fastener Connections HowTo.

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Tips of the Week

Cloning a Windchill Server

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Announcements

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Get tutorials, how-to videos and expert advice for:

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Virtual Classrooms provide interactive learning with a trained PTC instructor in convenient and manageable sessions that last approximately 4 hours over a series of days. It's easy to join a class right from your desk using a phone or voice-over IP technology.

Sessions are performed just like a traditional ILT (including interactive exercises where you and the instructor can work on lab exercises together) and feature some of our most popular ILT courses. These sessions cover the exact same material as the traditional ILT in-center courses. Also look for some of our most frequently requested mini-topics delivered in the same format that are only an hour - two hours in duration.

If you have any questions about these sessions or would like to see getting other courses, not on this list, on the schedule please feel free to contact me for more details. They are a great way to bring training to you without you having to worry about location or being out from work for long stretches.

You can register for these sessions just as you would for any normal ILT class either by:

1. calling order admin at http://www.ptc.com/services/edserv/training/registra.htm or

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2. you can go to PTC University directly at http://www.ptc.com/learning and submit a registration request directly. All you have to do is search the catalog by typing in “virtual” in the search field and you will see a listing.

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E-PROFILES IS HERE!! We have been eagerly anticipating the debut of the new electronic version of Profiles Magazine and now it is here! This new web site will supplement the print edition of the magazine and will provide new useful features not feasible with paper media. e-Profiles will provide you with 24x7, worldwide access to key information previously available exclusively in the print version. "Tips & Tricks," a popular feature pioneered by Pro/USER, has also moved to the web and will be expanded as the site matures. Please take a few minutes to check out this new web site. We don't think you will be disappointed. http://profilesmagazine.com/

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Upcoming Events & Training Class Schedules Upcoming, 2005 Your local Pro/Engineer User Groups http://www.ptcuser.org/rugs/ June 4 - 7, 2006 Dallas, Texas

PTC/USER International Conference http://www.ptcuser.org/

Events Our seminars and conferences seek to provide you with relevant information regarding product development trends in your industry as well as innovative software learning experiences. Think of them as a constructive day off where you can share experiences and swap ideas with your peers. If you can't manage to get away, we'll bring it to you. Check back often for regularly scheduled live webcast events.

You’re Invited to Attend…

Please visit the PTC Education Services website for the latest training information including course descriptions, schedules, locations, and pricing.

• Attend a course at any PTC Center and receive a free copy of Pro/ENGINEER Wildfire Student Edition!

http://www.ptc.com/services/edserv/index.htm

Live Instructor-Lead Virtual PTC Training Courses

Virtual Classrooms provide interactive learning with a trained PTC instructor in convenient and manageable sessions that last approximately 4 hours over a series of days. It's easy to join a class right from your desk using a phone or voice-over IP technology.

Sessions are performed just like a traditional ILT (including interactive exercises where you and the instructor can work on lab exercises together) and feature some of our most popular ILT courses. These sessions cover the exact same material as the traditional ILT in-center courses. Also look for some of our most frequently requested mini-topics delivered in the same format that are only an hour - two hours in duration.

If you have any questions about these sessions or would like to see getting other courses, not on this list, on the schedule please feel free to contact me for more details. They are a great way to bring training to you without you having to worry about location or being out from work for long stretches.

Customer PTC E-Newsletter 10/31/2005 Page 18 of 19

You can register for these sessions just as you would for any normal ILT class either by:

1. calling order admin at http://www.ptc.com/services/edserv/training/registra.htm or

2. you can go to PTC University directly at http://www.ptc.com/learning and submit a registration request directly. All you have to do is search the catalog by typing in “virtual” in the search field and you will see a listing.

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Note: These messages are compiled in the local PTC office and will be distributed via e-mail.

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