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April 2008
There is a common challenge faced by all
Industries in India today - Availability of Power. Energy
supply-demand situation has been a cause for concern with Global Demand
for Oil rising exponentially while supply has been progressively
getting reduced. Utilization of available natural resources in a
prudent way is of great importance to have a sustainable
eco-system.
Needless
to say, the use of right amount of material in the right area(s)
emphasises Design Optimisation and Efficiency Improvement calling for
right use of Knowledge of Design Parameters, Design Process, Validation
using FEA and Optimisation for least weight and cost.
This
edition focuses on Design Optimisation, Simple Steps in GD&T to
achieve perfection, an engaging Engineering
Design Contest and Fascinating aspects of Indian
Visionaries of yore. Video demonstrating Tolerance Analysis using
SolidWorks is also included. We welcome your feedback to provide
more enriching content and enhance your reading experience. We invite you to participate in the
Engineering Design Contest at the bottom of this Newsletter.
Yours sincerely
Editor
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"A little knowledge that acts is worth infinitely more
than much knowledge that is idle."
- Kahlil Gibran
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| Finite
Element Thought For The Day |
www.egsindia.com
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Accuracy in Finite Element Analysis depends on numerous
considerations including definition of objective, modelling strategy
adopted, loads & boundary conditions, choice of elements and
integration schemes, discretization procedure used and convergence
checks performed to validate the results in the domain under
consideration. Any ambiguity or lapse in the above
considerations would result in erroneous results and interpretation
that should be avoided at any cost.
With careful enumeration of an FE Procedure, these pitfalls can
be avoided resulting in accurate FE results reflecting of natural
phenomena. To ensure that the FE results are valid, one of the
considerations could be to evaluate the reactive force and grid point
force balance to quantify the errors due to discretization,
floating-point operations, truncation and integration. Accuracies
of the order of 99% in deflections, upto 95% in strains and 90% in
frequency estimations have resulted from careful considerations in
Finite Element Analysis. |
Contact
us For:
- Product Design
- Finite Element
Analysis
- Analysis to test correlation
- Failure Elimination
- DFMEA
- New Product Development
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- Training in FEA
- SolidWorks CAD
Software
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Software
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Trusted
Specialists since 1993
EGS Computers India
Private Limited
Regd. Office:
New No 90 Old No 342 Arcot Road
I Floor
Kodambakkam Chennai 600024 INDIA
Tel : +91-44-24803370 / 2372 0265
Telefax : +91-44-24844227
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Office:
1/1 B. R. Nagar, Trichy Road, Opposite Coimbatore Stock Exchange,
Singanallur Post, Coimbatore 641050 INDIA
Tel: +91 422 231 0268
Email : egsindia@vsnl.com
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Geometric Dimensioning
& Tolerancing - Simple Steps to Perfection
A common misunderstanding
exists in the engineering community that GD&T is only for mass
production components and not for limited volume production. This
cannot be farther from reality. Since, irrespective of the number
of components produced, GD&T is a language to translate designs
(developed based on fit, form, function requirements) into reality for
least cost and time. While these are common denominators for both
large and limited volume production, the misunderstanding seems to stem
from the impression that GD&T is restrictive and costly due to
tighter levels of controls. This impression is not true and
GD&T provides the designers with a choice of definition and control
that the situations demand. In fact, using GD&T one could
give more tolerance and get more parts passed in comparison to
conventional approach.
GD&T involves four simple steps:
- Identify part surfaces to serve as origins
and provide specific rules to establish starting point and direction
for measurements
- Convey nominal (ideal) dimensions and
orientations from origins to other surfaces
- Establish boundaries and / or tolerance
zones for specific attributes of each surface along with specific rules
for conformance
- Allow dynamic interaction between
tolerances (simulating actual assembly possibilities) where appropriate
to maximize tolerances
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GD
& T Drawing that reduces cost and increases tolerances
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CFD in
HVAC Designs
Heating,
Ventilation and Air
Conditioning
( HVAC ) has become an
integral part of our workspace to achieve
climate control objectives. Efficiency of an HVAC design depends
on effective Heat Management, Position and Orientation of Ducts and
Vents, Optimal Flow rate, re-circulation effects and blower rating.
Conservation
of energy is of paramount
importance while designing HVAC systems. Cosmos FloWorks helps
analyse different HVAC designs to meet objectives of performance
efficiency and effectives. In addition to providing the design
team with a choice of alternatives for better Heat Management, Cosmos
FloWorks also helps the team understand the nuances and efficacy of
each design for functional modifications and optimality.
Needless to
say, using Cosmos FloWorks
in HVAC designs results in optimal utilization of energy while
improving operational efficiency.
Need more information on using Cosmos
FloWorks? Contact
EGS India
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| Did
You Know?
 Powers
of observation and discrimination
are the highest attributes of human race that has often resulted in
human progress in terms of knowledge, understanding of natural
phenomena and quality of life.
1500 years ago, in the absence of
scientific instruments as they exist today, an Indian made remarkable
predictions,
calculations and inferences were made in the fields of mathematics,
astronomy and science. His works have formed the
basis for most of our modern day science.
Some of his findings include the
observations, with a high degree of precision, that the Earth was round
and revolved about the Sun. Time period of rotation for planets,
including Earth, around the sun, evaluation of PI, explanation of
Eclipses, Estimation of Earth's circumference, Solutions to
Indeterminate Equations, calculations on Squares and Cubic Roots are
some of the contributions made by this Great Indian Scientist. We
are referring to Aryabhatta I whose works have formed the basis for
astronomers of modern age.
Known popularly for contributing to the
definition of nothing ( Zero ), Aryabhatta has delineated his thoughts
and inferences in his Aryabhatiya, till date, one of the widely
referenced texts in the scientific world.
His theory of the relativity of motion
predated Einstein’s by 1400 years. And his studies in algebra and
trigonometry, which laid the foundations for calculus, influenced
European mathematicians 1,000 years later, when his texts were
translated into European languages from 8th century Arabic translations
of the Sanskrit originals.
How was it possible for Aryabhatta to
establish supremacy in a variety of predictions and calculations
without any aid? His works have demonstrated that the Powers of
Observation and Discrimination are highly essential in the field of
Science and Engineering. Combined with the penchant for Precision
and Perfection, Aryabhatta has shown to the world that, the answers to
most of the questions relating to Universe and its manifestations lie
within the realm of human comprehension and inference.
( Image: Courtesy www.indicethos.org )
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Tolerance
Analysis
using SolidWorks Office Premium
 Click Here to Watch Video How to address
the Assembly Tolerance requirement? Which Part tolerances
contribute to the required Assembly Tolerance? These are
questions asked by, almost, every design engineer when he or she
develops drawings of design for fit, form and function.
- Fast
tolerance stack-up calculation of maximum and minimum “worst-case” and
RSS for parts and assemblies
- Intuitive
and easy-to-use
- Ability
to create and display critical study dimensions directly on the 3D model
- Automatic
extraction of dimensions and tolerances necessary for the analysis
directly from the 3D models
- Automatic
calculation and display of a contributor's list of features and
tolerances based on percent impact on the critical evaluation dimensions
- Graphic
display of maximum and minimum condition in the 3D model
- Quickly
evaluate different tolerance schemes
- Seamlessly
integrated with SolidWorks DimXpert - automated part dimensioning and
tolerancing
- Ability
to export all analysis results in Excel
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Design
Challenge Contest
Design
shown below requires the assembly of a pin on a thin
sheet of steel. There is a problem of maintaining a
perpendicularity of 0.0025 for the shaft axis with respect to the base
of the thin sheet.
Objective:
Develop a toleranced design that would
ensure required perpendicularity
within the current dimensions shown. The designer has the
flexibility to change the design construction to achieve the required
tolerance while keeping in mind low cost and high volume
production. All dimensions shown are in mm.
Constraints:
Thin sheet is available only with a
flatness of 0.1 for specified size.
Thickness variation of thin sheet is plus/minus 0.01 while the pin
tolerance is left to the designer to achieve stated objectives.
Requirement:
Arrive at a low cost design with complete
GD&T Controls. All
entries should be sent via email only to info@egs.co.in (Only
Image,
DWG attachments allowed )
Deadline:
April 30, 2008
Attractive Prize for the Winner
Prize Selection: Best
Entry for proposed Design shall
be chosen based on solutions received.
Restrictions: Only ONE entry per
person shall be accepted.
While submitting the design solution (either in DWG or Image format),
the contact name, phone number, Company Name, Designation, Email Id
should be provided along with the entry. Otherwise the entry
would be rejected. No separate communication
in this regard would be entertained. EGS India reserves the right
to announce the winner based solely on its discretion. Prize will
be delivered only in India.
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