Monday, December 29, 2014

Happy New Years 2015 !

Another year has past.  I must say 2014 went by so very fast.  

Well here's the revised crystal ball based prognostications... 

1. The vortex returns and North America has another long cold winter.
2. Crude oil prices will bounce like a rubber ball back up by spring.
3. Li Ion battery chemistry is now able to drive a Tesla 400 mi on a charge... recharge in 30 min. will re-define the "gas station" experience as a place to relax and recreate for a half hour every 400 miles... I think - renewable breakthrough...
4. A major motorcycle brand will introduce a production hybrid
5. Major sub sea volcano makes news
6. Kryptos final message will be decoded
7. Genetic pharma breakthrough
8. Emilia Earheart's Lockheed Electra is found and brought to the surface
9. Major quake in Cali
10. Big news out of CERN in 2015...

I've been very busy for months but have had the time to do a lot of research on some thorny problems.  I had the chance to tour the "Show Boat" recently.  Here's a few pics.

On board BB55!

The 16 inch guns could send their rounds 23 miles

The mosquito planes were hoisted on and off the fan tail

6 inch guns athwart ship
Another beautiful church - St Nicholas - a very special name indeed
Hope you all enjoyed the pics,


Monday, December 22, 2014

Western and Eastern Christmas

Greetings all!

I want to take a moment to wish all of my visitors a joyous Christmas in the West, and to remember all of my friends who will celebrate the Nativity on 7 January this year!

Every now and then I get asked about why the Orthodox often celebrate Christmas or the Nativity on a different day...

Many of you know the answer to this question, and many of my visitors have no idea... I'm borrowing from this Orthodox explanation which seems to be very comprehensive to me...

The original source is here.

One aspect of Orthodox Christianity the WORLD OVER is that many both within and outside the Church find confusing is the fact that some jurisdictions (and some individual parishes and monasteries) within the Church follow the Julian, or old, calendar in their liturgical celebrations, while others follow the Gregorian, or new, calendar, which is the same calendar used by the secular Western world. Here we will attempt to explain briefly the difference between the two as well as the reasons for the disparity in contemporary usage. The Astronomical Problem
The Julian (old) calendar was developed during the reign of Julius Caesar, in the first century B.C. It was based on the assumption that a year is 365.25 days long, so the calendar had 365 days with a leap year every four years. Unfortunately, the year is actually about 365.2422 days long, so the calendar was losing about 11 minutes a year, or one day about every 128 years. By AD 325, when the First Ecumenical Council at Nicea met, the actual spring equinox (the day when night and day are of equal length) was falling on March 21 instead of the original March 25. At that Council, the Church decided to accept the Julian calendar with its acknowledged flaws and to set the date of the equinox (for the purposes of determining the date of Pascha) at March 21.
Eventually, in the 1500s, it got to the point that the equinox was falling on March 11, and people realized that if things went on this way, they would eventually be planting crops in January. So Pope Gregory VII commissioned a group of scholars to correct the calendar. This they did by deciding that on three of every four turn-of-the-century years, there would be no leap year. This gets the annual discrepancy down to an average of about 20 seconds, so the calendar should be accurate for the next 40,000 years. In order to get back into synch with reality to begin with, in 1582 they just jumped from August 5 to August 15, dropping ten calendar days. (The Julian calendar is now thirteen days behind the Gregorian because it had leap years in 1700, 1800, and 1900, when the Gregorian calendar did not. Both calendars had a leap year in 2000.)

The Historical Complications
So far, so good. Nobody had any problem with the accuracy of the new (called Gregorian after Pope Gregory) calendar. Unfortunately, when Pope Gregory informed the Orthodox East about the new calendar, he made it into a package deal with a set of theological changes-things like purgatory, selling indulgences, the filioque, etc.-that were completely unacceptable to the Orthodox Church. The Orthodox hierarchs could not find any way to accept the new calendar without leading people to believe that they were endorsing all the theological changes along with it. So they said, "Nope, sorry, we're sticking with the Julian calendar." The calendar wasn't a theological issue in itself; this was just the only possible response to the ecclesiastical/political situation at that time.
Again, so far so good until 1923. Then Patriarch Meletios of Constantinople called a council to discuss putting the Church onto the Gregorian calendar. At this time the political situation was again very precarious, with Greece trying to win independence from Turkey. Unfortunately, the council was not truly representative of world Orthodoxy. Some people didn't come at all, and others left when they realized what Meletios's agenda was. It seems that he was trying to repeat history and again to package the Gregorian calendar with a lot of Western innovations-so that he could get financial and political support from the Anglican and Roman Catholic churches. Ultimately a council of only nine men decided to adopt the Gregorian calendar for the whole Church.
Now, because of the decision of the Council of Nicea to accept the Julian calendar, a new calendar could only properly be accepted by an ecumenical council or a properly representative local council, which this was not. So because of the improprieties involved in the decision, the Patriarchs of Moscow, Jerusalem, and Antioch rejected it. (Antioch later changed its mind and accepted the new calendar.) They had no problem with the calendar itself, only with the way the decision was made. There needed to be an ecumenical council to decide the issue, but what with the Russian Revolution, etc., that wasn't possible at the time.
So that's why the Jerusalem Patriarchate-in company with 90 percent of the Orthodox world-is on the old calendar. The calendar is still not a theological issue, nor should it be a sort of "litmus test" of true Orthodoxy, although this attitude is occasionally encountered in some old calendar proponents. It's simply the result of some unfortunate historical developments.

The Practical Ramifications
Now, what does this mean in practical terms? Basically, it means that those feasts (called "fixed feasts") that fall on a specific calendar date (as opposed to "movable feasts," which are linked to the date of Pascha) are celebrated thirteen days later by old calendar churches than by new calendar churches. For example, the Feast of the Transfiguration falls on August 6 on the new calendar, but is celebrated on August 19 by old calendar churches-because August 19 according to the Gregorian calendar is August 6 according to the Julian calendar.
The same applies to the commemoration of saints who died before 1924 (when the Gregorian calendar was adopted by some Orthodox churches)-their feast is celebrated thirteen days later on the old calendar. However, modern saints (those who died after 1924) are celebrated on the same day in all churches. For example, St. John of Shanghai and San Francisco died on July 2, 1966, and his feast is celebrated on July 2. On the Julian calendar the day of his death is called June 19, but it is the same actual day as the Gregorian July 2.
The date of Pascha is determined with relationship to the spring equinox, the Jewish Passover, and the phase of the moon, and is the same for all Orthodox churches (although usually different from the date of Easter in the Western churches). Therefore, all feasts and fasts linked to the date of Pascha-including Lent, Ascension, and Pentecost-are celebrated on the same day by all Orthodox.

Wednesday, December 17, 2014

As we roll towards the 2015

Shooooof, 2014 went by so fast!  A pretty darned good year too I might add.  This is just a fun post and a way to pass my greetings on to one and all, especially Johanna and Nicholas who I love so much!  Miss you guys!  So here's 2014 in 12 pics.  Hope you enjoy!

Nick and I stopped in to a little hut to warm up one day in January while skiing the ABR. Love you Nick, miss you Johanna! Hope we get out again this year!!!
February was crazy cold!  Nick and I had a wonderful time in Calumet.

March and my little dharuma buddy from Shingijutsu.... when am I ever going to color in that other eye? This thing has collected dust and wore a hard hat for a few years now. 
April marked the end of the hardest winter I have ever lived through...340.5 inches of cumulative snowfall ooooph.
May and a beautiful scene of the start of spring, and with that spring came the nicest summer I can ever remember.
June was BEAUTIFUL!  The dwarf crab apple bloom was delightful.
July and Happy B-Day Johanna and me too! This was the best B-Day cake I have ever eaten! The secret ingredient was coffee - so I'm told! A 5 STAR rating.
August and on a hike in Virginia I came across this very cool Great Blue Heron...
September and another harvest. Lots of great food from this years garden too!

October brought beautiful Italy - this was a street I wandered down in Firenze
November and the Christmas trees are up!
Merry Christmas!
And a partridge eating wild berries!

I hope and wish and pray for our good health, happiness and prosperity  2015.

Sunday, December 7, 2014

Battle of Chacellorsville

Readers of my blog know I like to explore in my travels.... today's adventure was a visit to the Chancellorsville Battle Grounds a notable Civil War conflagration which ultimately cost Stonewall Jackson his life.

Entrance to the park on a fine December day

A cannon ball lodged in a tree

The spot where General Jackson was wounded by his own men during a night reconnaissance mission

Aerial Photo of Jackson Shrine
Out building where the General died eight days later.  The wounded General was brought back to Guinea Station, a safe location near a rail station where it was hoped the recovering General could eventually return to Richmond.

You can read about the plantation where the General past here.  The out building is all that is left today. 

Round bales, square bales and a really creative mind

Sunday, November 30, 2014

Ever hear of King Gambrinus?

I had the chance to wander through the old Pabst Brewery in Milwaukee and took a few pics of what's left.  The brewery ceased operations in 1996 after 112 years of brewing on Chestnut Street Hill.

The Brewery was open for a holiday event
 A great opportunity to step back into another time.  The pics below show a few of the rooms that were used to host special occasions on Chestnut Street...

I think this was some kind of sampling room... notice the brewing process mapped out along the ceiling

Really fantastic old wood work and you can't miss the architectural "1800's" look.

Must have been a show place in its day...

A couple more things caught my eye...

Never heard of the "King Gambrinus" maybe that's how the saying "The King of Beers" got started...  I understand he used to be on top of a building and was sort of a Milwaukee tradition.

And look who else was checking things out...

This is pre-Thanksgiving Santa.  He wanted to check out the old brewery too!
Here's a good thing to ponder and painted on the side of a building in Milwaukee !
Yup, it's a choice, positive is waaaay better than negative!
See you later, 


Tuesday, November 18, 2014

Winter of 2014 Prognostications...

Hmmm with MC Escher as inspiration, I'm inaugurating my prediction post for 2015! Why does Escher have such strange bookshelves and a knocked over chair?
1. The vortex returns and North America has another long cold winter 90% iced over Superior - brrr...
2. Crude oil will hover around 100 USD / bbl all year
3. Li Ion battery chemistry will enable a 350 mile range but not yet a 30 minute recharge for autos
4. A major motorcycle brand will introduce a production hybrid
5. Major sub sea volcanic thermal loading will be linked to el nino not greenhouse gasses
6. Kryptos final message will be decoded
7. Streaming TV - like local news - wham - on your 7th gen smart phone - just a tap away
8. Emilia Earheart's Lockheed Electra is found and brought to the surface
9. Hilbert's 16th problem ( for n=8 )... falls in 2015

10. Big news out of CERN in 2015...

I'll trot out the list on New Year's day for an update, then we'll check it out on Jan 1 2016...
I think I'll adopt the "Ding" or "Bonk" scoring system.


Friday, October 24, 2014

A matrix solution to a simple torsional vibration problem

It's been a while since I thought about this, and because I still get a lot of inquiry on torsional vibrations from my post on the subject months ago and continue to get good questions,  I'm revisiting it again.

I've worked a lot of these problems in lower drivetrains, hybrid vehicles with inertially massive rotors, dual mass flywheels that make stuff go clunk... and ship propulsion... so I thought why not set up a simple 4 mass system as I started off doing, but never quite finished and show how to solve for the natural frequencies of the various modes and look at the mode shapes and discuss what they may influence in any design...

As always, this is an area I've worked on as an engineer for around thirty years.  I've done a lot of work in transmission design - both gearboxes and cases and both gear and bearing life and noise radiated analysis, diesel engine design and lots of structures too... but this torsional stuff is sort of a favorite area of mine!

So let's use the example of a 4 stroke 4 cylinder engine with a flywheel, first attached to a propellor, then the same system used to drive a rear wheel drive tractor... We'll have case A and case B.

The first step is to discritize the components into their equivalent mass elastic properties.  Here error is introduced as in the real world nothing is ever a cylinder or a prismatic shape and when things twist they are generally NOT linear in their stiffness, but they are reasonably so in a defined range of interest.  We can approximate the pieces of a system with these understood inertial and physical characteristics, but in fact we have more complicated geometry like fillets, oil holes, tapered flanges, splines and on and on and on... Where we see this error having a more profound effect is in the accuracy of prediction of the higher modes - modes where the mode shape and frequency accuracy are more and more dependent on several nodal crossings and the distribution of energy across many elements of the system.  Fortunately the higher modes of excitation are USUALLY, but not ALWAYS, of little or no concern to us as hysteretic damping and the lack coupled with the lack of a high energy forcing function usually keep things from finding a way to get to amplitude magnification.  Happily it's the way things usually work out to be, but not always! So ignoring modes of higher order, say the 4th or 5th mode and beyond are commonly done once we build a prototype and have test data to look at.  So the first 3 modes are usually what you want to be aware of, and a good rule of thumb is to understand what excitation exists in your system and to understand that dwelling on a mode could be a problem.  There are ways to move modes (soft couplings or even rigid couplings... adding inertia or reducing inertia... lots of stuff can be done to synthesize any system).

The first step in a normal modes analysis is just to solve the set of ODE's which is usually done without damping.  Sort of a quick look at what the system is tuned for...  We can solve these equations a number of ways.  A popular method is to use the Holzer Method, another is by direct matrix algebra.  Lets take a look at these two.

General Approach Using Transfer Matrices with a sweeping Omega term in Goalseek:


Mass Elastic System for Case A:

The Transfer matrices Method uses Point and Field Matrices to characterize the system, then the Omega variable is swept to find the zero crossings, which define the Mode Shapes...

Holzer's Method is a good alternative, both techniques are easy and fast
As time allows I'll add more detail to the calculation steps I'll post the cell equations if anyone wants them...


Mass Elastic System for Case B:

Wednesday, October 22, 2014

Roll out from MSP

Just a quick post to share the last departure from MSP.   I noticed this little guy out of my excellent peripheral vision...

What's that you ask?
Seems like we took off with one of our nations finest aircrews...

Why it's a very cool C-17.

Friday, October 17, 2014

Cinque Terra Vacation

Sorry I haven't posted in some time, it has been a very busy summer for me but I did manage to get in a very nice vacation hiking the Cinque Terre on the very rugged coast of Italy. 
Here's a few pictures to share.  I'll post a few more pics over the weekend. I did make it to Firenze, Como, Milan and Mandello del Lario and toured the Moto Guzzi museum...

The best vacation EVER...

Monterosso al Mare as seen from the trail
The Cinque Terre are five villages that dot the Italian Riviera and are part of a National Park.  The trails are made of macadam and cut stone with hundreds and hundreds of steps that wind there way through the steep cliffs that plunge to the sea.  The views are truly awesome with treks through vineyards and olive tree groves all part of a days hike.  The first town in the sequence of the five going South is Monterosso al Mare, shown above.  There's this huge sculpture in the old part of the city...

Neptune - a concrete and iron sculpture created in 1910, during WW2 it was damaged. Originally the statue had a trident and huge shell...
Typical trail cut into the steep terrain with lots and lots of...
STEPS and more steps!
The trail follows the land features in such a way that you climb and serpentine your way though the dense vegetation from town to town.

Trail side view of Vernazza, I recommend eating at Batti Batti

There are many wonderful little places to explore.  The restaurants and shops are small and unique with a lot of local art on display.  Seafood is a common staple of the Cinque Terre and I dont think you can go wrong with ordering any seafood.
Artist on the street

So after hiking the Cinque Terre the next stop was Florence or Firenze in Italian...  An amazing old world city with many treasures to experience.

View from Michelangelo Piazza
The Uffizi Gallery was wonderful as was the Galileo Museum.

Sculpture of Christ
 The Ponte Vecchio is a fascinating place... very sparkely

Wall to wall jewelery of the most exquisite designs

A most cooperative mime at the Uffizi

Around the corner from the Uffizi...

Moving around Italy is pretty easy and efficient on the TrenItalia rail system.

Train station at Milan Airport (Malpensa)
Lake Como - a very beautiful place!
 On the last day - Moto Guzzi!

The train station is right across the street from the plant!

Carlo Guzzi and I hanging out in downtown Mandello del Lario...

It is I knocking at the big Red Door at the Moto Guzzi Factory...

 You can hear the famous 1957 Guzzi V-8 here...  The factory rep explained to me that in the second year of racing they discovered that they had to add an extra fuel chamber on the carbs just so the engine wouldn't starve for fuel in corners... More art from Italy - desmodronic valves too!

Ok, not to diminish Honda's break out CB 750 I-4 "Dream Machine." But this Magnum Opus of Carcano's rolled out of  the Mandello plant 12 years before... AND this mill ran the Monza 500cc Grand Prix Circuit -- I'd doff my fedora (if I had one) to Giulio Carcano Ing extraordinaire. 

Carcano was one heck of an engineer!
I really think ├╝ber creative people tend to have crazy hair...

Hope you enjoyed the pics.  I have a 100's more, if anyone is inetersted in finding out more about Cinque Terre just ask.