Image courtesy of Engineering Center LTD, Russia

MA9206-2: Digital PrototypingMechanical Simulation Overview

John Holtz, Peter MaxfieldProduct 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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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

Safe

ty F

acto

r

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