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.  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 1) Velocity 2)Pressure 2)Pressure 2)Thermal conditions 2)Thermal conditions in the modeled fluid fields 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 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.  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,  · 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 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 com com