s1-1 adm703, section 1, august 2005 copyright 2005 msc.software corporation part 1 advanced...

S1-1ADM703, Section 1, August 2005Copyright 2005 MSC.Software Corporation

PART 1

ADVANCED MODELING AND BEST PRACTICES


PART 1: ADVANCED MODELING AND BEST PRACTICES

This part of this training course shows you how to apply advanced modeling techniques for use with ADAMS/Solver.

This part includes: Jet Engine Turbine Spring-Damper System Washing Machine Gatling Gun Fire Mechanism Over-Running Pulley Best Practices


SECTION 1

JET ENGINE TURBINE


JET ENGINE TURBINE

Model a catastrophic event (for example, a bird strike) in which one of the blades in a jet engine turbine is broken off. Illustrate the importance of shaft flexibility in accurately representing the shaft bearing loads.

What’s in this section: Using ADAMS/Solver to Change Model Topology Auto Beam Element Generator Creating am ADAMS/Solver Command File Postprocessing Review Workshop 6: Jet Engine Turbine


USING ADAMS/SOLVER TO CHANGE MODEL TOPOLOGY

You can change model topology during a simulation. For example:

Breaking connections

Releasing constraints used solely for static equilibrium

Representing power-off scenarios

You can do this by using ADAMS/Solver commands in a simulation script.


USING ADAMS/SOLVER TO CHANGE MODEL TOPOLOGY (CONT.)

DEACTIVATE command The DEACTIVATE command turns off a statement that was

previously turned on by the ACTIVATE command, or that was active by default.

Format:


AUTO BEAM ELEMENT GENERATOR

ADAMS/View has three ways to represent flexible parts:

Import from finite-element model (ADAMS/Flex)

Create a flexible part within MSC.ADAMS (for example, ADAMS/AutoFlex)

Use a discrete flexible link (beam elements)

The following diagram illustrates the use of the beam element method:


AUTO BEAM ELEMENT GENERATOR (CONT.)

The BEAM statement in the ADAMS/Solver dataset creates a compliant force element (essentially, a stiffness and mass matrix) based on the Timoshenko beam bending theory.

Using the automatic beam-element generator functionality in ADAMS/View, you can quickly discretize geometry of simple cross-sections into a set of rigid parts connected by beam elements.


AUTO BEAM ELEMENT GENERATOR (CONT.)

To model the effects of a beam, ADAMS/Solver uses a linear translational and linear rotational action-reaction force between two markers. The forces the beam produces are linearly dependent on the displacements, rotations, and corresponding velocities between the markers at their endpoints.


CREATING AN ADAMS/SOLVER COMMAND FILE

Using a text editor, enter the commands you want to use to control your simulation, using the following guidelines:

The first line must contain the name of your dataset file.

The second line is the prefix name you want assigned to the output files that ADAMS/Solver creates.

The following lines contain all of the different commands you want ADAMS/Solver to use while performing the simulation.

The last line in your file contains the STOP command.

You should save the file with the extension .acf, although it is not required.


CREATING AN ADAMS/SOLVER COMMAND FILE (CONT.)

In this example, the name of the dataset is compressor.adm and the base name that is assigned to all of the output files ADAMS/Solver creates is run1 (run1.msg, run1.out, and so on). The next four lines turn off the separators between the different simulations in the output files, performs a transient simulation, the motion is deactivated, and then performs another transient simulation. The simulation is finally terminated with the STOP command.

Sample ADAMS/Solver command file


SAMPLE ADAMS/SOLVER COMMAND FILE (CONT.)

In ADAMS/View, you can create a simulation script, which is analogous to the ADAMS/Solver command file. To do this, select Simulate Simulation Script New, and then change Script Type to ADAMS/Solver Commands. The only difference is that the model name and output results name (the first two lines of the ADAMS/Solver command file) should not be used.


POSTPROCESSING REVIEW

Using ADAMS/PostProcessor to create powerful visualization and communication pieces.


POSTPROCESSING REVIEW (CONT.)

ADAMS/PostProcessor allows you to: Plot

Animate

View split screens

Simultaneously plot and animate

Create movies

s1-1 adm703, section 1, august 2005 copyright 2005 msc.software corporation part 1 advanced...

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