To Study About Ansys Software

TO STUDY ABOUT ANSYS SOFTWARE

INTRODUCTION

CAE - Computer Aided Engineering

FEA – Finite Element Analysis

- Approach of applying loads on a discretized element (divided) of a model and deriving the end result for the entire model.

ANSYS – FEA simulation software by ANSYS Inc., U.S.A.

OTHER SOFTWARES

MSC – NASTRAN,

LS – DYANA,

COSMOS,

Pro – E Mechanical.

VARIUOS CATEGORIZATION IN ANSYS

ANSYSMultiphysics Mechanical

E.magnetics

FLOTRAN (C.F.D)

LS-DYANA

Professional

Design space etc.,

Mechanicalstructural analysis

Thermal analysis

Electromagnetic analysis

Computational fluid dynamics

Coupled field analysis

FEA ANALYSIS PROCEDURE

1. PRE-PROCESSOR

(Preference phase)****create / import model

****define material properties

****discretize / mesh the model

****define the boundary conditions & loads

1. ANALYSIS

(Processor phase)****problem solving / evaluation

C.POSTPROCESSOR

****review of result / deformed shape

****generating reports in various forms.

THE STEPS THAT WILL BE FOLLOWED IN THE SOFTWARE EXECUTION ARE:

A. Preprocessing

1. Change Job name.

2. Define element type.

3. Define real constants.

4. Define material properties.

5. Create key points.

6. Create lines between key points.

7. Specify element division length.

8. Mesh the lines

B. Solution

9. Apply constraints and loads to the model.

10. Solve.

C. Post processing

11. Plot deformed shape.

12. List reaction forces.

13. List the deflections.

13. Exit the ANSYS program.

ANSYS LAB MANNUAL

INTRODUCTION TO ANSYS

The ANSYS program is a computer program for finite element analysis and design. You use the program to find out how a given design works under operating conditions. You can also use the ANSYS program to calculate the proper design for given operating conditions.

The ANSYS program is a general-purpose program, meaning that you can use it for almost any type of finite element analysis in virtually any industry-automobiles, aerospace, railways, machinery, electronics, sporting goods, power generation, power transmission, and biomechanics, to mention just a few. General-purpose also refers to the fact that the program can be used in all disciplines of engineering-structural, mechanical, electrical, electromagnetic, electronic, thermal, fluid, and biomedical.

A TYPICAL ANALYSIS

The ANSIS program has many finite element analysis capabilities ranging from a simple, linear static analysis to a complex, nonlinear transient dynamic analysis.

. Build the model

. Apply loads and obtain the solution

. Review the result

STRUCTURAL ANALYSIS

Many types of structural analysis are available in the ANSYS program. The primary unknowns (nodal degree of freedom) calculated in a structural analysis are displacements. Other quantities, such as strains, stresses, and reaction forces, are then derived from the nodal displacements.

The following types of structural analyses are possible:

Static Analysis

Modal Analysis

Harmonic analysis

 Transient dynamic analysis

Spectrum analysis

Buckling analysis

In addition to the above analysis types, several special-purpose features are available, such as fracture mechanics, composites and fatigue.

THERMAL ANALYSIS

Thermal analyses are used to calculate the temperature distribution and related thermal quantities in an object. The ANSYS program uses a heat balance equation obtained from the principle of conservation of energy as the basis for thermal analysis. All three primary modes of heat transfer-conduction, convection, and radiation are handled by the ANSYS program. In addition to the three modes of heat transfer, you can account for special effects such as change of phase and internal heat generation.

. Steady state thermal analysis

. Transient thermal analysis

. Radiation

MAGNETIC FIELD ANALYSIS

Magnetic analyses are used to calculate the magnetic field in devices such as power generators, transformers, video display devices and so forth. The ANSYS program uses Maxwell's equations as the basis for magnetic field analysis. The three types of magnetic analyses are possible:

Static magnetic analysis

Harmonic magnetic analysis

Transient magnetic analysis

Six element types are available for magnetic analysis, consisting of 2-D element, three 3-D elements, and one 3-D current-source line element.

ELECTRIC FIELD ANALYSIS

Electric field analysis is used to calculate the electric field in conductive or capacitive systems. The ANSYS program uses Lap lace equation as the basis for static electric field analysis.

FLUID ANALYSIS

A "fluid analysis" in the ANSIS program may mean any of the following capabilities:

Fluid flow with heat transfer

Acoustics

Contained fluid

Dynamic fluid coupling

COUPLED-FIELD ANALYSIS

A coupled-field analysis is one that takes into account the interaction (coupling) between two or more disciplines of engineering.

MODEL GENERATION

The ultimate purpose of your finite-element analysis is to recreate mathematically the behavior of an actual engineering system. The model generation will mean the process of defining the geometric configuration of your mode's nodes and elements.

Typical steps involved in model generation:

Planning your approach

Erect coordinate systems

Using picking and working plans

Solid modeling

Meshing your solid model

Revising your model

Adaptive meshing

Direct generation

 Piping models

 Number control and element reordering

Coupling and constrained equations

LOADING AND SOLUTION

The primary objective of a finite element analysis is to examine the responses of a structure or component to certain loading conditions. Specifying the proper loading conditions is, therefore, a key step in the analysis. You can apply loads on the model in a variety of ways in the ANSYS program. Also with the help of load step options, you can control how the loads are actually used during solution.

LOADING

A load step is simply a configuration of loads for which a solution is obtained. How to apply loads? Most loads can be applied either on the solid model or on the finite element model.

SOLUTION

Two methods of solution are available in the ANSYS program: frontal solution and Jacobin conjugate gradient (JCG)solution. You can choose the method as an analysis option. By default, the frontal method is used.

POST PROCESSING

Post processing is that phase of an analysis in which you review the results. It is probably the most important step in the analysis. Two postprocessors are available to review your results: POST1, the general postprocessor, and POST26, the time-history processor.POST1 allows you to review the results over the entire model at specific load steps and sub steps. POST26 allows you to review the variation of a particular result item at specific points in the model with respect to frequency, or with respect to some other result points.

GRAPHICS

CREATING GRAPHICS DISPLAYS

You can create many types of graphics displays--geometry displays, result displays, and graphs. Creating any displays is a two step process: first, you use graphics specification function to establish specifications for your display, then you use graphics action function to actually produce the display. These functions can be activated either by issuing commands, or by manipulating special menus.

Getting started with graphics

Creating geometry displays by using button menus or action commands.

Creating geometric results displays.

Creating Graphs

SELECTING AND COMPONENTS

Select logic is the ability to select subsets of nodes, elements, keypoints, lines,etc. so that you work with a handful of entries. The ANSYS program uses a database to store all the data that you define during an analysis. This database design allows you to select only a portion of the data without destroying the rest of the data. You can select a subset of entities by using a combination of seven basic select functions: select, reselect, also select, unselect, select all, select none, and invert.

SUB MODELING

Sub modeling is a finite element technique to get more accurate results in a region of your model. The procedure for sub modeling consists of the following steps:

Create and analyze the coarse model

Create the sub model

Perform cut boundary interpolation

Analyze the sub model

Verify the sub model

ANSYS PARAMETRIC DESIGN LANGUAGE (APDL)

APDL stands for ANSYS parametric design language which allows you to build your model in terms of parameter that in turn allows you to make design changes easily and conveniently. In APDL parameters are user- named variables to which you can assign numeric values. When you use a parameter in a numeric field of an ANSYS command, the value of that parameter will be substituted.

DESIGN OPTIMIZATION

Design optimization is a technique that seeks to determine an optimum design. To calculate an optimum design, the ANSYS program performs a series of analysis and the usual procedure for design optimization consists of six main steps:

Initialize the design variable parameters

Build the model parametrically (PREP7)

Obtain the solution (SOLUTION)

Retrieve the results data parametrically and initialize the state

Variable and objective function parameters (POST1/POST26)

Declare optimization variables and begin optimization (OPT)

Review and verify optimum results

Sub structuring

Sub structuring is a procedure that condenses a group of elements into one element represented as a matrix. A substructure analysis involves three distinct steps or passes:

Generation pass

Use pass

Expansion pass

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ME 2404 - COMPUTER AIDED SIMULATION AND ANALYSIS LAB