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ELEATION's ANSYS Basic Training Program : Session 1 : Theory of CAE
ELEATION
Overview
This video introduces Computer-Aided Engineering (CAE), a field that uses computer software to simulate and analyze product behavior under various conditions. It explains the importance of design validation, which assesses a component's ability to withstand loads and predict potential failures. Three primary methods for design validation are presented: analytical, numerical, and experimental. The video then details four key numerical methods—Finite Element Method (FEM), Boundary Element Method (BEM), Finite Volume Method (FVM), and Finite Difference Method (FDM)—explaining their applications and differences. Finally, it clarifies the distinction between CAD (design) and CAE (analysis), highlighting their complementary roles in product development.
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Chapters
- Design validation answers critical questions about a component's performance under load, such as failure points, fatigue life, and material suitability.
- It is a metric process to determine stresses, displacements, strains, and other factors that could lead to component failure.
- This validation is essential for manufacturers to offer guarantees and warranties on their products.
Understanding design validation is crucial because it forms the basis for ensuring product safety, reliability, and performance before manufacturing, saving costs and preventing failures.
For a car part, design validation would determine the maximum load it can handle before breaking, where it's most likely to fail, and if a different material would make it stronger or lighter.
- Analytical method uses existing formulas to calculate results, offering 100% accuracy for simple designs but struggling with complexity and requiring specific formula knowledge.
- Numerical method employs CAE software to solve complex problems, providing approximate results across the entire component by dividing it into elements, even without a physical part.
- Experimental method involves physical testing of manufactured components, yielding accurate results by accounting for real-world errors but is time-consuming and expensive.
Knowing these methods helps you understand the trade-offs between accuracy, cost, time, and complexity when choosing how to test and validate a design.
For a steel scale fixed at both ends with a central force, the analytical method uses a formula, the numerical method uses software like ANSYS, and the experimental method involves building and testing the actual scale.
- Over 30,000 companies prefer numerical methods due to the limitations of analytical and experimental approaches.
- The four main numerical methods are Finite Element Method (FEM), Boundary Element Method (BEM), Finite Volume Method (FVM), and Finite Difference Method (FDM).
- These methods allow for faster results and analysis of complex real-world problems using computer calculations.
These numerical methods are the backbone of modern engineering analysis, enabling engineers to simulate and predict product behavior with high efficiency and accuracy.
The video highlights that over 30,000 companies choose numerical methods, implying widespread adoption and trust in their capabilities for product validation.
- Finite Element Method (FEM/FEA) is widely used for analyzing stresses, deformations, and thermal properties under static or dynamic conditions.
- Boundary Element Method (BEM) focuses on vibration analysis, predicting responses to noise and vibrations, and is crucial for NVH (Noise, Vibration, Harshness) engineers.
- Finite Volume Method (FVM) is primarily used for Computational Fluid Dynamics (CFD) to analyze fluid flow and its interactions with solids.
- Finite Difference Method (FDM) involves using two or more numerical methods together to achieve a single output, such as using FVM for pressure and FEM for stress.
Understanding the specific applications of FEM, BEM, FVM, and FDM allows engineers to select the most appropriate tool for a given simulation problem, leading to more accurate and efficient designs.
Using FVM to calculate air pressure on an airplane wing and then using FEM to determine the stresses on the wing from that pressure is an example of FDM.
- Computer-Aided Design (CAD) is used in the initial stages to create 2D or 3D models of products, defining dimensions and materials.
- Computer-Aided Engineering (CAE) is used in later stages to simulate and analyze the behavior of these CAD designs under various conditions.
- CAD focuses on 'what' the product looks like and its geometry, while CAE focuses on 'how' it will perform and behave.
- Both CAD and CAE are essential and often used together throughout the product development lifecycle.
Distinguishing between CAD and CAE clarifies their respective roles in product development, emphasizing that design creation and performance analysis are distinct but interconnected processes.
A car designer uses CAD to draw the shape of a new car body, while an engineer uses CAE to simulate how that car body will withstand a crash.
Key takeaways
- Design validation is a critical step in engineering to ensure product reliability and safety by predicting performance under various conditions.
- Numerical methods, particularly FEM, are the preferred approach for design validation in modern industry due to their efficiency and ability to handle complex problems.
- FEM, BEM, FVM, and FDM are specialized numerical techniques, each suited for different types of engineering simulations, from structural analysis to fluid dynamics.
- CAE software allows engineers to create virtual prototypes, reducing the need for expensive and time-consuming physical testing.
- CAD is for designing the product's form, while CAE is for analyzing its function and performance, making them complementary tools in product development.
- Understanding the principles of CAE is essential for optimizing product performance, durability, and safety across various industries.
Key terms
Computer-Aided Engineering (CAE)Design ValidationAnalytical MethodNumerical MethodExperimental MethodFinite Element Method (FEM/FEA)Boundary Element Method (BEM)Finite Volume Method (FVM)Finite Difference Method (FDM)Computer-Aided Design (CAD)Computational Fluid Dynamics (CFD)Noise, Vibration, Harshness (NVH)
Test your understanding
- What are the three primary methods used for design validation, and what are their main advantages and disadvantages?
- How does the numerical method differ from analytical and experimental methods in validating a design?
- What is the primary application of the Finite Element Method (FEM) in CAE?
- Explain the role of Finite Volume Method (FVM) and how it relates to Computational Fluid Dynamics (CFD).
- What is the fundamental difference between CAD and CAE, and how do they work together in product development?