Chapter 3 Design Studies
Design Studies
A model is usually subjected to different service environments and operational conditions
during its life. It is therefore important to consider all possible scenarios of loads and
boundary conditions and try differ
Output of Frequency Analysis
When plotting displacements (mode shapes), directions X, Y, and Z
refer to the global coordinate system. If you choose a reference
geometry, these directions refer to the selected reference entity.
To list all requested resona
Using a uniform rise or drop in temperature for the whole model.
Importing a temperature profile from a steady state or transient thermal analysis.
Importing a temperature profile from COSMOSFloWorks.
The Include thermal effects check box in the Flow/T
Chapter 2 Analysis Background
Effect of Loads on Frequency Analysis
When building the geometry of a model, you usually create it based on the original
(undeformed) shape of the model. Some loads, like the structures own weight, are always
present and can
The following quantities do not use reference geometry:
P1
= Normal stress in the first principal direction (largest)
P2
= Normal stress in the second principal direction
P3
= Normal stress in the third principal direction (smallest)
VON
= von Mises stres
Chapter 2 Analysis Background
The von Mises stress is computed from the six stress components as follows:
2
2
2
2
2
2
VON = cfw_ ( 1 2 ) [ ( SX SY ) + ( SX SZ ) + ( SY SZ ) ] + 3 ( TXY + TXZ + TYZ )
(1 2)
Or equivalently, from the three principal stresse
Linearity Assumption
all materials in the model comply with
Hookes Law, that is Stress is directly
proportional to Strain.
Nonlinear
analysis
Nonlinear
analysis
the induced displacements are small
enough to ignore the change in stiffness
caused by loadi
Chapter 2 Analysis Background
In a continuous body, you can view the stress at a point as follows:
Imagine an arbitrary plane that cuts through the body at that point,
Consider an infinitesimally small area around that point on the plane,
Suppose that
Material properties. You must define the Youngs Modulus (also called the
Modulus of Elasticity). Poissons Ratio is assumed to be zero if not defined. In
addition, you need to define the density when considering the effect of gravity and/
or centrifugal l
Chapter 2 Analysis Background
Linearized Buckling Analysis
Models with thin parts tend to buckle under axial loading. Buckling can be defined as the
sudden deformation which occurs when the stored membrane (axial) energy is converted
into bending energy w
Output of Linearized Buckling Analysis
When plotting displacements (mode shapes), directions X, Y, and Z
refer to the global coordinate system. If you choose a reference
geometry, these directions refer to the selected reference entity.
To list all reques
3
Design Studies
The concept of design studies lies at the heart of the operation of COSMOSWorks. In this
chapter, you learn about the following topics:
Design Studies. Understand what a design study is and learn the underlying concepts.
Study Types. Expl
Required Input for Thermal Analysis
To perform thermal analysis, you need the following:
Meshed model. You must mesh the model before running the analysis. The Nodeto-Node contact condition results in isolated contact faces. The Surface contact
condition
Chapter 2 Analysis Background
Face 2
Face 4
The middle area of face 1 is
totally blocked against
radiation from face 2
Face 3
Face 1
Considering blocking in radiation by participating faces
Open Versus Closed Radiation Systems
An open radiation system con
Chapter 2 Analysis Background
Radiation
Radiation is the thermal energy emitted by bodies in the form of electromagnetic waves.
All bodies with temperatures above the absolute zero emit thermal energy. Because
electromagnetic waves travel in vacuum, no me
Chapter 2 Analysis Background
a pressure of 250 x 2.3 = 575 psi on face 2 and face 3
If the critical load factor is negative, then buckling occurs only if you
apply all loads in the opposite directions.
Thermal Analysis
Thermal analysis studies the flow
Surface- to-Surface Radiation
The rate of thermal energy exchange between two radiating faces depends on their
temperatures, view factors, and emissivities.
Radiation View Factors
View factors, also known as shape or configuration factors, play a direct r
Convection
Convection is the heat transfer mechanism by which heat energy transfers between a solid
face and an adjacent moving fluid (or gas). Convection involves the combined effects of
conduction and the moving fluid. The fluid particles act as carrier
Chapter 2 Analysis Background
Output of Static Analysis
By default, directions X, Y, and Z refer to the global coordinate
system. If you choose a reference geometry, these directions refer to
the selected reference entity.
Displacement components:
UX
= D
Chapter 2 Analysis Background
Linear Static Analysis
When loads are applied to a body, the body deforms and the effect of loads is transmitted
throughout the body. The external loads induce internal forces and reactions to render the
body into a state of
Chapter 1 COSMOSWorks Fundamentals
Working with Assemblies
When working with assemblies, note the following:
Make sure that automatic loading of components as lightweight in Tools,
Options, System Options, Performance is unchecked.
While the automatic l
Basic Concept of Analysis
COSMOSWorks uses the Finite Element Method (FEM). FEM is a numerical technique
for analyzing engineering designs. FEM is accepted as the standard analysis method due
to its generality and suitability for computer implementation.
Thermal Studies
Thermal studies calculate temperatures, temperature gradients, and heat flow based on
heat generation, conduction, convection, and radiation conditions. Thermal studies can
help you avoid undesirable thermal conditions like overheating and
Chapter 1 COSMOSWorks Fundamentals
Design Studies
A model is usually subjected to different service environments and operational conditions
during its life. It is therefore important to consider all possible scenarios of loads and
boundary conditions and
1
COSMOSWorks Fundamentals
This chapter presents information about the basic concepts and terminology used in
COSMOSWorks. You will learn about the following topics:
What is COSMOSWorks?. Introduces COSMOSWorks.
Benefits of Analysis. Learn about the benef
Chapter 1 COSMOSWorks Fundamentals
COSMOSWorks formulates the equations governing the behavior of each element taking
into consideration its connectivity to other elements. These equations relate the response
to known material properties, restraints, and
Chapter 1 COSMOSWorks Fundamentals
What is COSMOSWorks?
COSMOSWorks is a design analysis system fully integrated with SolidWorks.
COSMOSWorks provides one screen solution for stress, frequency, buckling, thermal, and
optimization analyses. Powered by fast
Introduction
The COSMOSWorks Software
COSMOSWorks is a design analysis automation application fully integrated with
SolidWorks. This software uses the Finite Element Method (FEM) to simulate the
working conditions of your designs and predict their behavio
System Requirements
For the most recent information about system requirements, refer to the information
provided in the Read This First sheet included in the box that contains the
COSMOSWorks software CD.
Book Structure
The book is organized in chapters t
CSC 433 / 533: Spring 2017
Assignment 1
Assigned: Tuesday, January 24th
Due: 11:59pm Tuesday, Feb 7th
For this assignment you will work with a single program that uses OpenGL and renders objects
in normalized device coordinates, -1 x 1 and -1y1. The progr