MA9206-2: Digital Prototyping

Image courtesy of Engineering Center LTD, Russia

MA9206
-
2: Digital Prototyping

Mechanical Simulation Overview

John Holtz,
Peter Maxfield

Product Design

Welcome

Overview

Inventor Simulation


Static & Modal
Analysis


Dynamic Simulation


Algor Simulation


Fluid Flow & Thermal


Unsteady Fluid Flow


Mechanical Event
Simulation (MES)


MES with Nonlinear
Materials


Frequency Response


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-
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MFG Simulation Suite

Autodesk Inventor Simulation

Completes the Digital
Prototyping toolset


Integrated Stress
Analysis and Rigid Body
Dynamics


Make your first article
production quality

Autodesk Inventor Simulation

3D Joints & Forces

Dynamic Performance
Studies

Assembly Stress
Calculations

Optimization
Studies

Stress Analysis

R2010 introduces:


Assembly support


High speed solver


Automatic p
-

and h
-

refinement


Local mesh & solver
convergence

Stress Analysis

R2010 introduces:


Parametric studies


Optimization


Multiple simulations


Ribbon interface

Interface


Improved browser


Multiple simulations


Fast editing


New task
-
based ribbon


Familiar object names
& editing methods

Solver

Fast, adaptive solver
delivers solutions
quickly and
accurately

Batch solve for
multiple studies

Convergence can be
localized

Simplification

Exclude components
and features

CAD model remains
unaffected

Improves solve time
without sacrificing
results

Parametric Studies

Explore design
alternatives

Identify key
dimensions

Smart sampling for
efficient solves


Optimized

Safety Factor

Track the effect of a
Parameter on the
current Result

Plot

Rib Thickness (mm)

Optimization
–

Goal Seeking

Automatic Optimization

Adjust Value

Promote to Model

One step to update design with optimized parameters

Dynamic Simulation

Rigid Body Motion

Not just geometric
constraints but
mechanical joints

Forces, Torques,
Gravity, Contacts,
Springs, Dampeners,
Graphers, Traces,
Time steps...

Joints

Three main choices for
building constraints:



Automatic Conversion



Manual Conversion



Manual Authoring


All bodies are rigid and
all joints are ideal

Motion Loads

Autodesk Algor Simulation

Autodesk Algor Simulation


Analysis Types (partial list)


Linear Static Stress


Linear Dynamic Stress (modal, response spectrum, random
vibration, buckling load, transient stress)


Nonlinear Stress (large displacement, nonlinear materials)


Thermal (steady state and transient)


Electrostatic (current and voltage; field and voltage)


Fluid Flow (steady and unsteady; open channel flow)


Coupled (combine the effects of fluid flow and thermal in one
analysis)


Autodesk Algor Simulation


Element Types


Line elements


Truss (axial only)


Beam (axial and bending)


Springs


Area elements


Plate and shell


Membrane


Composite plate


Volume elements


3
-
D solid


2
-
D solid (planar and axisymmetric)


Examples

Compressor and Motor Base

Frequency Response


A base structure for a compressor and
motor was modeled with a combination of
beam and plate elements. A Frequency
Response analysis (or sine sweep) was
performed to simulate an imbalance in the
motor. The stress and deflection of the
structure over the range of operating
frequencies is the result of the analysis.

Compressor and Motor Base

Flow Around Dome

Unsteady Fluid Flow


The air flow around a 31 foot (9.4 meter)
diameter dome is revealed by displaying
the streamlines. By performing such
analyses, the placement of outdoor
accoutrements can be chosen to minimize
the impact on visitors.

Hyperelastic Bellows

Mechanical Event
Simulation (MES) with
Nonlinear Material Models


Mechanical Event Simulation (MES)
includes a number of material models
which include the effects of nonlinear
material behavior. MES was used to
analyze a rubber bellows subjected to a
longitudinal displacement. The Mooney
-
Rivlin material properties were derived by
curve fitting simple tension, equibiaxial,
and pure
-
shear test data. The two images
shows the displaced model and an outline
of the undeformed model.

Hyperelastic Bellows

Contour shows
the radial
displacement.


Note how the
convolutes
buckle at this
elongation.

Hyperelastic Bellows

Contour
shows the
strain.

Nonlinear Beam

Mechanical Event
Simulation


A rectangular tube, fixed on each end and
made from plastic is, loaded to full
pressure (at 1.5 sec) and unloaded. The
full load causes the material to exceed the
yield strength. Thus, the beam retains a
permanent deformation when the load is
removed.

Nonlinear Beam

Stress Contour at
Maximum Load

Nonlinear Beam

Stress Contour at No
Load (Residual Stress)

Nonlinear Beam

Stress Contour at No
Load (Residual Stress)

Nonlinear Beam

Pinball Drop Target

Mechanical Event
Simulation


A pinball strikes a target and results in
dynamic stresses and deflection.

Heat Exchanger

Coupled Fluid Flow and
Thermal


A heat exchanger with 7 fins and internal,
non
-
pumped fluid. The fluid is heated by a
pipe (red part) carrying hot fluid passing
through the body of the exchanger.


The fluid is cooled by air flowing over the
fins. The heating and cooling of the
internal fluid causes buoyancy effects
which cause the fluid to circulate through
the exchanger.

Heat Exchanger

Heat Exchanger

Heat Exchanger

Circuit Breaker

Mechanical Event
Simulation


Three analyses were combined to
calculate the performance of a circuit
breaker.

1.
Electric current passes through based
on the resistance of the materials and
voltage difference.

2.
The current causes heat generation
which causes a transient temperature
distribution.

3.
The differential expansion between the
two materials in the bimetallic strip
causes it to deform which releases the
tripper.

Circuit Breaker

Circuit Breaker

Circuit Breaker