Computer Aided Engineering

meanchildlikeMechanics

Oct 31, 2013 (3 years and 7 months ago)

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Computer Aided
Engineering

Presented by Jasmin Duljkovic

Boise State University

What Will Be Covered


An exercise


Brainstorming
-
application and
use of CAE


Nuts and Bolts


How the CAE works


Real world example


CAE definition


Computer Aided
Engineering



CAE retrieves description and
geometry from a CAD database


It is used in almost every industry
such as aerospace, automobile
manufacturing


CAE depends on CAD

CAE


Computer aided engineering is
an engineering analysis
performed at the computer
terminal using a CAD (Computer
Aided Design) system


Brainstorming about
CAE


How is could be used in my or any other
organization?


CAE can be used to perform variety tests
like car crash the test simulation


Commercial and military flight simulations


It is also used to analyze properties of
different types material used in production


Application of computerized methods
during the design of technical systems








Brainstorming about
CAE


It increases production efficiency
and quality through better designs


Executives and managers heavily
rely on CAE analysis


Tool for decision making
-
what the
product is going to look like, its
performance characteristics


What improvements need to be
made?

Nuts and Bolts


CAD analysis on computer screen


No need to build products’ prototypes


Results of analysis essential for
product future


Customer satisfaction is priority


CAE has to be compliant with many
U.S. and international standards

Nuts and Bolts


Product real
-
world performance and
safety


Products tested for any possible
conditions you can think of


The key idea is to make predictions
of products’ life and capabilities


Provide the customers with a
concept before building expensive
prototypes and pre
-
production units


Nuts and Bolts


Conceptual design thorough
analysis


Optimization of the concept


Final results of analysis help
reduce future costs


Great savings in time and money


Ensures achievement of
customer satisfaction

Nuts and Bolts

CAE is applied in these four main
types of analysis:


Finite Element Analysis (FEA)


Computational Fluid Dynamics
(CFD)


Boundary Element Analysis
(BEA/Acoustics)


Kinematic/Dynamic Analysis


Finite Element Analysis




Finite element analysis can be
executed on mechanical systems to
conduct static and dynamic
analyses, along with identification of
natural frequencies and mode
shapes. Capabilities range from
single component analysis to large
multi
-
disciplinary research projects.



FEA

FEA Software



∙ SDRC I
-
DEAS Master Series 6
& 7


∙ ANSYS


∙ NASTRAN


∙ ABAQUS


∙ HyperWorks Suite

Why Should FEA Be
Used?


It allows the customer the product
before investing into building
expensive prototypes and pre
-
production units. It is an effective
tool to analyze problems that can
range from NHV to durability issues.


Analysis is composed of various
types of testing

Tests Conducted:


Static stiffness testing


Modal analysis


Impact testing


Acoustic testing


Valvetrain Dynamics


Additional FEA
Capabilities


Composite and Nonlinear Analysis


Viscoelastic Material Database of
over 3,000 materials


Isolation system and damping
treatment design


Forces reconstruction


Tuned Dampers can be designed and
optimized


Constrained and free layer damping
treatment design



Nonlinear Valvetrain Analysis

CFD


Fluid flow and heat transfer
optimization is essential in the early
design cycle


CFD tools provide engineers insight
into complex transient and turbulent
flow fields


It allows analysis and provides
design for engineers to optimize
component geometry for efficient
fluid flow and heat transfer

Why Should It Be Used

It visually allows users to view:


1) Velocity


2)Pressure


2)Thermal conditions


in the modeled fluid fields


Properties from the fluid flow and
heat transfer such as forces,
temperature and film coefficients
can be used in other analysis codes
such as FEA and BEA

Boundary Element
Analysis(BEA)


It is used to predict noise
characteristics on various
mechanical systems


When coupled with FEA, BEA is very
useful in determining the acoustical
effects of structural design
modifications


It uses COMET acoustics software

Why Should BEA be
used?


It allows the customer to predict
acoustical performance of your concept
before production. This allows for design
modifications to improve the overall
acoustic characteristics without costly
laboratory testing and various prototypes
from having to be fabricated.


BEA is used
to predict and optimize the Noise,
Vibration, and Harshness (NVH)
characteristics of various structures from
small components to full size powertrain
systems and interior vehicle cabs.

BEA Capabilities


Sound pressure analysis


Sound intensity analysis


Sound power predictions


Radiation efficiency analysis


Subjective noise prediction (audio
listening files)


Sound quality optimization (Noise
field prediction and analysis

Kinematic/Dynamics
Analysis

Tool used is called ADAMS


It is the world’s most widely used
mechanical systems simulation tool.


It is capable of static or dynamic
analysis of motions and forces
associated with both rigid and
compliant multi
-
bodied large
displacement non
-
linear motion
mechanical systems.



Kinematin/Dynamics
Analysis

The use of this tool will help:


Design, develop and validate your
product virtually,


Optimize the performance of your
product,


Eliminate numerous costly physical
prototypes, and


Bring your product to market quicker.

Why Should K/D A Be
used?

Design Applications:



∙ Position the tie rod of a vehicle to
achieve the desired toe curve,




∙ Determine the static and dynamic
operating loads of a vehicle
suspension,


∙ Determine the operating envelope
of a moving robot arm, or Provide an
ADAMS model of a system for in
house design work.

Other Uses

Development Applications



Sort through selection of bushings
for optimal vehicle performance,


Determine level of damping required
for machine isolation,


Try out a prototype linkage design
before physical hardware is built, or


Determine the trade
-
offs and effects
of caster on steering effort.


Other Uses

Test Applications



Design test fixture to input motion
and loads,


Eliminate test fixtures with virtual
testing,


Determine the durability loads of a
vehicle on a virtual road, or


Determine if vehicle meets rollover
criteria.


Real World Example
-

MEMS

What are MEMS?


Micro Electro Mechanical Systems
(MEMS) are micromachines the size
of a grain of salt or the eye of a
needle that integrate mechanical
elements, sensors, actuators and
electronics on a common silicon
substrate.

MEMS Applications

MEMS applications include:


optical switches within
telecommunication and networking
systems,


accelerometers in automotive
airbags,


inkjets in desktop printers and


sensors in medical testing
equipment.

Exercise


Krebs
Engineers

Krebs Engineers from Tucson, AZ


CAE changed the way they operated
for the last 50 years


Processes improved along with
efficiency and flow of technical
information


In the past, they worked manually


CAE software and systems
introduced automation to their
business

Summary

CAE is an analysis entirely done on
computer using CAD systems. Its
purpose is to analyze different
materials, products, their
performance and quality such as
durability, stability, endurance and/or
reactivity to any possible factor that
can affect the performance of the
material, part, and/or the product. It
is cost saving and ensures customer
satisfaction and improves the speed,
efficiency and the quality of many
products ranging from simple parts
to vehicles, airplanes etc.

Reading list

http://www.roushind.com/html/cae.html

http://www.computeraidedengineering.
com

http://www.fea
-
online.com

http://www.marc.com

http://www.optem.com

http://www.ece.curtin.edu.au

http://kernow.curtin.edu.au/cae.html