Subject: Re: Source for Books
From: Chris Maass
Date: Tue, 03 Dec 1996 23:45:08 -0800
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Sam I Am wrote:
>
> Hello all!
>
> Does anyone know of a good mail-order source for technical books?
> My school only carries the books neede for the courses being offered
> during the semester. If anyone has any info to offer I would very much
> appreciate it!
>
> Dan McAllister
> mcallist@eden.rutgers.edu
Try Op Amp Books in Los Angeles. They've got a good selection of all
types of technical books, including many textbooks. www.opampbooks.com
--
cmaass@ix.netcom.com | The new Tau Beta Pi District 15 T-shirts are
here!
cmaass@calstatela.edu | See the shirt's rear graphic at
| http://et_hp1.calstatela.edu/dexter/t_shirt.html
Chris Maass, Treasurer, Tau Beta Pi, California Iota Chapter
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Opamp Catalog
OPAMP TECHNICAL BOOKS
1033 N. Sycamore Ave. - Los Angeles, CA 90038
(800)468-4322 - FAX (213)464-0977
Most titles listed are normally in stock & ready to ship.
Subject: New Scientific Product Search Engine
From: "Joe Bumgarner, Jr."
Date: Wed, 04 Dec 1996 06:37:28 -0500
"Take a Minute, Save an Hour!"
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We also value your feedback and support so much that we want to give you
free stuff for it!! It's our way of saying thanks for taking the time to
help us. After using our site, go to the "Free Stuff for Feedback"
button and fill out the feedback form. You will receive a free SciQuest
T-shirt or hat if:
-you make a suggestion to improve our site and we adopt your idea.
-we use your email comments in our marketing materials.
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Subject: legal aspects of Digital Design Master
From: Dean Taylor
Date: Wed, 04 Dec 1996 13:31:11 +0100
What are the legal aspects of a "Digital Design Master" ? My
understanding is that this term implies that the reference model
for a product is the CAD model and associated data in the Product Data
Management System.
There seem to me to be many questions here worthy of discussion.
In this case there are no paper documents that can be signed and
dated. How can the authenticity of the data files be proven ?
If approval by a P.E. is required, how is a P.E. to "approve" the plans.
(As a side question, for most consumer products, is P.E. signoff on
product drawings required ?)
I'm asking this question from the perspective of an academic currently
visiting a CAD group in Germany. This question is a current topic of
discussion in Germany because the laws regarding "Design Master" data
seem to be incompatible with current technology.
Are any practicing engineers in the US wrestling with this problem ?
One can suggest printing an output of the CAD model and filing that.
However, any presentation of data (drawing) generated from a CAD model
is at best incomplete, missing come aspects of the CAD model.
I'm looking forward to some discussion on this and related topics.
Dean Taylor
Subject: Need statics & dynamics textbook advice
From: lavan123@aol.com
Date: 4 Dec 1996 13:31:18 GMT
Hi,
I m looking to buy two good books. One on Engineering statics, the other
Engineering Dynamics. I don t leave near a University, so I can t just
peruse the bookstore. Besides, they may not stock "the best." Can
someone recommend a well written, easily understood book ? Admittedly, it
takes lots of detail for me to grasp concepts so great graphics and lots
of examples would be desired. MIGHT EVEN CONSIDER A book on CD if it has
proven to be helpful.
I intend to use the book with SHAUMS (sp) to refamiliarize myself with the
topics. If there is one book that covers both topics and is well written,
even better. If you have it, provide enough information so that I can
find the book you recommend (name, edition and Author or even the ISBN #
and the phone number to a company Like brown s that sells it ). I d
appreciate any help you can provide.
thanks!
Subject: Re: Thermophotovoltaic generators
From: "James W. Baker"
Date: Wed, 04 Dec 1996 10:17:15 -0500
Lockheed Martin Defense Systems has developed a Thermophotovoltaic (TPV)
portable power source sized to provide 500W of power using readily
available fuels (DF-2, JP-8) as its energy source which makes it a good
choice for powering field electronics (radios and such).
The technology details are considered proprietary, but energy conversion
efficiency is much higher than with previous thermionic power sources.
Compared to Honda and Suzuki 100W commercial electric generators this
TPV power generator is about 2/3 the volume (smaller), 1/8 the aural
signature (quieter), and 5 times greater power density with respect to
weight (lighter).
Virtually noiseless back-pack type units could be developed to power
personal equipment. Virtually noiseless TPV power units could be
applied to any tank or vehicle so that electronic radio and surveillance
equipment would not have to operate off the vehicle battery. This could
improve stealth operations since the vehicle would not need to be
restarted to charge the battery, thereby reducing the chance of aural or
thermal signature detection. Also the TPV power unit could operate off
the same fuel used by the vehicle, simplifying logistics.
I mention military applications here since the original proposal was for
the Army, but numerous commercial applications are possible too.
If anyone is interested in considering the technology for their
application, let me know and I can put you in contact with someone to
discuss the application and arrange the appropriate disclosure
agreements.
Jim Baker
Principal Hardware Design Engineer
Lockheed Martin Defense Systems
BTW, to Dan Evens: Yes I can define thermophotovoltaic, but I would
have to kill you afterwards.
Subject: Re: Solution strategies for non-linear finite-element analysis
From: Combustion Dynamics
Date: Tue, 03 Dec 1996 11:53:31 -0700
If the shell is in compression, you are probably at a limit point.
Full Newton-Rhapson will not work at this point. Displacement
control, or load-displacement control is required to obtain
convergence. You might be able to tell by possibly increasing the
load step, and then investigating for a negative pivot in the
decomposed stiffness matrix. If this is the case, then the structure
is buckling, and the above mentioned solution strategies are
necessary.
Rick.
Subject: Re: Impact of FEA on design cycle time
From: klingener@aol.com
Date: 4 Dec 1996 17:10:46 GMT
In article ,
chrisw@skypoint.com (Christopher Wright) writes:
>In article <57v7k3$rj1@kocrsv08.delcoelect.com>, Rhod Fitzpatrick
> wrote:
>
>>I would be interested in any specifics regarding time and/or
>>money saved by the use of engineering analysis.
< snip first part of Chris' response >
> ... and at worst it allows the uninformed either to study a problem to
the
>point of paralysis or make decisions on the basis of imagined physics.
> ...
Hear, hear.
My experience with computational structural mechanics extends back to
1962, and I have seen many more abuses of fea, both in application and in
interpretation, than successes.
Several years ago, I attempted to make a living by leveraging my
structural analysis experience in nuclear systems by leasing ANSYS and
taking it to people who design consumer and high volume products. During
the two years that I followed that approach, I found that the applications
could be placed into one of the following three categories:
1) The existing design was failing in service. To an experienced
designer, the flaws were obvious on inspection. Some flaws and their
fixes could be demonstrated using fea; others, such as sharp reentrant
corners in castings, could not.
2) The new design was off by an order of magnitude or two, based on a few
Roark calculations, and the client thought that the whole thing could be
saved through the magic of fea. It could not.
3) The design was a high quality part made under tightly controlled
processes with pedigreed materials. It had a long service history and
solid empirical design rules implemented on a programmable hand
calculator. A low-cost introductory fea was successful in validating the
empirical design rules for fatigue life. There was no follow-on work.
I don't do fea anymore.
---------------------------------------------
Fred Klingener
Brock Engineering PC, Roxbury CT
klingener@aol.com
---------------------------------------------
Subject: Re: Need statics & dynamics textbook advice
From: "Stephen W. Dyer"
Date: Wed, 04 Dec 1996 11:54:14 -0500
lavan123@aol.com wrote:
>
> Hi,
>
> I m looking to buy two good books. One on Engineering statics, the other
> Engineering Dynamics.
Try: R.C. Hibbeler, Engineering Mechanics: Statics and Dynamics,
Macmillan Publishing Company, New York.
This is a fairly good and fairly popular book with lots of pictures :)
Be sure to get the latest edition. And beware, engineering textbooks
these days are NOT CHEAP (especially this type of "two-in-one" books).
It's possible that an older book might be cheaper. You also could not
go wrong with:
F.P. Beer & E.R. Johnston, Vector Mechanics for Engineers: Statics,
McGraw Hill
F.P. Beer & E.R. Johnston, Vector Mechanics for Engineers: Dynamics,
McGraw Hill
Good Luck!
Steve Dyer
Mechanical Engineer
Balance Dynamics Corporation
Ann Arbor, MI
Subject: New Book Available on Wet H2S Cracking of Carbon Steels and Weldments
From: "Dr. R.D. Kane"
Date: Wed, 04 Dec 1996 12:13:16 -0600
New Book Available on Wet H2S Cracking of Carbon Steels and Weldments
R.D. Kane and M.S. Cayard from CLI International, Inc (Houston,
Texas) have combined efforts with R. Horvath from Shell Oil Products
to edit a new technical publication for NACE International. The book
contains over fifty years of classic papers on Wet H2S cracking of
steels in oil and gas production and refinery operations. Over 70
papers are included which discus topics ranging from wet sulfide
stress cracking, hydrogen induced cracking and SOHIC, to hydrogen
permeation, fitness-for-service methodologies and metallurgy and
processing.
A more complete discription and table of contents is given at:
http://www.clihouston.com/weldmt.htm
The book can be order through NACE International at:
New Book Available on Wet H2S Cracking of Carbon Steels and Weldments
R.D. Kane and M.S. Cayard from CLI International, Inc (Houston,
Texas) have combined efforts with R. Horvath from Shell Oil Products
to edit a new technical publication for NACE International. The book
contains over fifty years of classic papers on Wet H2S cracking of
steels in oil and gas production and refinery operations. Over 70
papers are included which discus topics ranging from wet sulfide
stress cracking, hydrogen induced cracking and SOHIC, to hydrogen
permeation, fitness-for-service methodologies and metallurgy and
processing.
A more complete discription and table of contents is given at:
http://www.clihouston.com/weldmt.htm
The book can be order through NACE International at:
http://www.nace.org
Dr. R.D. Kane
--
CLI International, Inc.
The Materials & Corrosion Specialists
http://www.clihouston.com
CLI's New Specialty Equipment Division offers
Equipment backed by service and experience.
Subject: Purity of "Pure " Gold?
From: Mark Thornton
Date: Wed, 04 Dec 1996 17:27:10 +0000
Can anyone tell me what the purity of "pure gold" is?
This is not such a stupid question as it sounds.....
The American Society of Testing and Materials have a standard (B562-86)
for "Refined Gold", which gives 4 grades of gold, with purities of
99.5%, 99.95%, 99.99% and 99.995%.
Can anyone tell me which grade is the one that is traded on the world's
gold markets?
Thanks in advance for all help received.
Mark
--
Mark Thornton Tel: +44 1223 332760
Cambridge University Eng. Dept. Fax: +44 1223 332662
Trumpington Street E-mail: mht11@eng.cam.ac.uk
CAMBRIDGE CB2 1PZ, UK
http://www2.eng.cam.ac.uk/~mht11/
Subject: Re: Impact of FEA on design cycle time
From: Chris@cprsys1.demon.co.uk (Chris Rogers)
Date: Wed, 04 Dec 1996 18:38:35 GMT
>In article <57v7k3$rj1@kocrsv08.delcoelect.com>,
>Rhod Fitzpatrick wrote:
>I am researching the impact of engineering analysis (specifically FEA) on
>design cycle time. I would be interested in any specifics regarding time
>and/or money saved by the use of engineering analysis.
>
>Thanks.
>
>Rhod Fitzpatrick
>
Rigorous engineering analysis, using a combination of programs can
produce significant cost savings, when applied correctly. I have
experience in the saving of cost in the application of fire protection
measures to offshore oil and gas production facilities. Jobs have
saved between £100K and £3.5M, for an analysis outlay of £30 - 100K.
These are savings over the traditional "deemed to satisfy"
applications produced by single element programs.
It is easier to reduce cost when extreme or hazard loads are involved
and in mass production. Exotic materials and complex or weight
sensitive situations can also be an advantage.
As mentioned elsewhere in this thread, building parametric models to
allow re-analysis saves lead time by re-using models.
Subject: Advice Requested
From: labowman@wesnet.com (Lisa Bowman)
Date: 4 Dec 96 18:44:01 GMT
Fellow Engineers,
Please give advice or make comments as appropriate...
I am in the process of leaving the military side of mechanical
engineering and entering into the commercial sector. I have a BS and an MS in
mech eng, an MS in mat eng, and am registered in the state of Ohio. I have 11
years experience in structures with an emphasis in organic composite
materials. I plan to stay in western Ohio (if possible), and I am looking for
a position as a senior engineer or technical manager. At this point, I am not
so specific on which industry that I would like to enter, just as long as it
is progressive and requires true engineering problem solving.
Now, do any of you have any point-of-contacts which could advise me on
what I would need to do to make myself more attractive to their respective
industries (i.e. automotive, civil engineering, manufacturing, aerospace...).
I am not asking for a job, just advice. I need to know what to emphasize or
brush-up on, technically and managerially, so that I can better attack the job
market here. Thanks.
KBB
Please post response to bulletin board.
Subject: Research Equipment
From: strauss@mdd.comm.mot.com (eric strauss)
Date: Wed, 04 Dec 1996 12:52:28 -0800
************Research Test Equipment for Sale*********
Targeted to research companies or universities involved with High speed
Axial Synthetic bearings lubricated by seawater.
Equipment for Sale: Testbed for Synthetic or CTC made Axial Thrust Bearings
for applications utilizing motors driven by seawater operating above or
under water (to avoid any environmental pollution).
The testbed is mounted on a steel frame (Dim: 160cm x 90cm x 60cm, Weight:
350kg)
Testbed includes the following:
1) Asynchronous Electric motor (Siemens) 4 KW, 380V at 955 rpm with
frequency variator and Starter in a protective enclosure box.
Input: 420-380V, 50Hz, 25 Amps
Output: 0-420V, 0-50Hz, 25 Amps
2) 5 Analogic and 5 Danfoss Pressostatsensors to measure the correct
pressure/force between the stationary and mobile part of the axial bearing
plus 2 intermediate internal pressure gauges.
3) 1 Torque meter with a range of 0 up to 100Nm and speed up to 4000 rpm
and sensitivity of less than +/-0.2% (Hottiner Baldwin Messtechnik)
4) 1 Flowmeter (sea water greasing) Variomag of Endress + Hauser which
measure water flows from 0 to 37 L/min through a diameter of 40 mm. -16bar
+/-1%.
5) 1 rpm meter (Ecomatic) coupling assembled 0-20MA.
6) All water pipeline connections and hoses to testbed are also included.
Also included are technical references and books covering Torque
meter-pressure sensors-rpm meter-flowmeter-test runs pertaining to three
University studies covering thrust bearings of high rpm-small particle
size, lower rpm-large particle size and proposed modifications.
Value of equipment-studies and measuring devices: $101,500 Cdn. All for
sale at $61,500 Cdn.
If interested, please reply to Eric Strauss via email:
strauss@mdd.mot.comm.mot.com
Subject: Re: Purity of "Pure " Gold?
From: Brian D Mendelssohn
Date: Wed, 4 Dec 1996 16:18:44 -0500
On the Ney York COMEX exchange, they buy/sell bundles of 100 troy ounces
(+/-5%) of refined gold, assaying not less than .995 fineness, cast
either in one bar or in three one-kilogram bars, and bearing a serial
number and identifying stamp of a refiner approved and listed by the
Exchange. A list of approved refiners and assayers is available from the
Exchange upon request.
-=-Brian
Brian Mendelssohn
SMC 4463 POBox 3015
Pittsburgh, PA 15213
412.862.2655
http://mendelweb.res.cmu.edu
bdm@andrew.cmu.edu
Doherty Apartments B-11
Kota Is My Roommate!!
Subject: Re: Impact of FEA on design cycle time
From: "David E. Pearce Jr."
Date: Wed, 04 Dec 1996 17:28:58 -0700
Christopher Wright wrote:
>
> In article <57v7k3$rj1@kocrsv08.delcoelect.com>, Rhod Fitzpatrick
> wrote:
>
> >I would be interested in any specifics regarding time and/or
> >money saved by the use of engineering analysis.
> I think I'd research the impact of something else. I doubt if anyone
> really knows. My own opinion after some time in the biz is that it doesn't
> save money or time at all. It does allow people to study physical behavior
> more effectively--sometimes that's useful or even indispensable, but at
> best it gives you a shot at something you might not have tried otherwise
> and at worst it allows the uninformed either to study a problem to the
> point of paralysis or make decisions on the basis of imagined physics.
>
I work in the rocket industry, specifically very thin wall pressure
stabilized structures. When we pressurize a fuel tank, we get rather
large deflections. We use FEA not to save time and money, but to save
weight. Without FEA, we cannot without large margins for error predict
many loads due to structural deflections. Without accurate loads, we
have to put on large factors of safety. That means the difference
between a F.S. of 1.25 on ultimate and 2+ on ultimate. Structural weight
can have a structure/payload weight factor from 14:1 to 1:1 (14 lbs
structure subtracts 1 lb of payload to 1 lb structure subtracts 1 lb
payload.) And 1 lb of payload capability can make the difference of
getting into orbit or not.
Consider that the tank I work on can carry 100,000 lbs of RP-1
pressurized to 110 psi, yet weighs about 1800 lbs and on the bottom of
it we have 400,000 lbs of force pushing on it and on top of it we have
250,000 lbs pushing down.
For most of our work we have emperical data to use, but some areas just
about cannot be analyzed except by using FEA.
