Posted in Academic Issues

My Rimsky-Korsakov Moment in Academia

In 1871, Nikolai Rimsky-Korsakov became a Professor of Practical Composition and Instrumentation at the St. Petersburg Conservatory.  In retrospect, given the music he composed, this is not extraordinary.  At the time, however, it was amazing.  He was still in active service in the Russian Navy.  More importantly, although he had had private music lessons and was very active with the “Five” (the group of Russian composers which gave Russian music its distinctive character,) he had never had any conservatory training!  He worked hard to make up for this, and in doing so departed from the rest of the “Five” in making conservatory training part of being a Russian composer.

Russia is a very specific country; many strange things happen there and wherever Russians go.   But maybe not as strange as we think: although I would never put myself in the rank of Rimsky-Korsakov in my own field, starting today I am a Lecturer in Mechanical Engineering at the University of Tennessee at Chattanooga.  For those of you who have followed this site for a long time, this will seem quite odd, especially considering that one of the centrepieces of this site is the geotechnical courses that I have taught for nearly twenty years.  My friend Jean-Louis Briaud, now President of the American Society of Civil Engineers, tried to encourage me with the fact that George Goble, who developed many of the tools we use in pile dynamics, started out as a mechanical engineer.  But in reality some explanation is in order.

My entry into this field was through the equipment route, specifically the Vulcan Iron Works.  That occasioned my first degree to be in Mechanical Engineering from Texas A&M University.  Impact (and later vibratory) pile driving equipment is an unusual type of equipment to design and build.  Basically it involves having a ram accelerate downwards due to gravity (with or without downward assist,) do this 30-120 times a minute, and stopped each time by deceleration which can be in the range of 150 g’s.  This eliminates many common solution techniques used for mechanical design problems.  Injected into an environment where service is frequently delayed and breakdown ruinous,  it makes for many exciting moments in business.

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The equipment, however, interacts with the pile which it is driving and the soil into which the pile is driven.  Understanding this is really important in the proper design of the equipment.  That realization came slowly but surely.  By the time my family’s time at Vulcan was coming to an end, I was in graduate school, which ultimately resulted in a MS Degree in Civil Engineering.  Before and during that time I presented several conference papers.  But by the time I received my degree, my future in the deep foundations industry was uncertain.

Although I had other activities in the following years, that uncertainty was ended by three events. The first was starting this website; to make an educational resource like this you have to have some understanding of what you’re disseminating. The second was my involvement with Pile Buck and the compilation of two books: Sheet Pile Design by Pile Buck and Pile Driving by Pile Buck.  The third was my teaching at the University of Tennessee at Chattanooga.  When my MS thesis committee chairman retired, I taught Soil Mechanics and Foundations for one academic year (2001-2) thanks to another committee member, Dr. Edwin P. Foster, the Civil Engineering department head, who evidently thought enough of my abilities to bring me on.

The University had other ideas; due to some complex budgetary issues, they could not see their way clear to have me teach these courses as an adjunct for most of the last decade.  It was not until 2009 that Ed Foster’s retirement and the concurrence of the current department head, Joseph Owino, meant that I was able to teach geotechnical courses at UTC on a consistent basis, something I have done ever since.

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Force Waves in PileIn 2011 I started my PhD in Computational Engineering, which is yet another engineering discipline.  But both advanced degrees had one thing in common: they concerned pile dynamics, and that brings us to the marriage of mechanical and geotechnical engineering.  It’s worth noting that E.A.L. Smith was Raymond’s Chief Mechanical Engineer, before George Goble came on the scene.  Pile dynamics in any form involves things moving and moving fast, and civil engineers in general don’t find this very congenial.  It’s an interdisciplinary field, one where mechanical engineers–and even equipment people–can make serious contributions.

Upon completing my PhD in 2016, my first new teaching assignment was the Fluid Mechanics Laboratory.  This came as a shock to some, but things have worked out, and in any case an understanding of fluid mechanics is essential to geotechnical and mechanical engineer alike.  But ultimately, as so many things are in academia, the full-time appointment (which many have pestered me about since I got my PhD) came from the Mechanical Engineering department due to internal considerations of the College of Engineering and Computer Science.

In going through all of this there’s one trend to be noted that also ties this into Rimsky-Korsakov’s story: the growth of the importance of formal education in the construction industry.  In his case his conservatory experience didn’t endear him to some of his compositional colleagues, who were worried that European “formalism” would spoil the result.  When I came into the family business in the late 1970’s many of our customers had little if any formal education beyond high school.  Like some of the “Five” they accomplished great things.  Today however the educational level of the construction industry–offshore and onshore alike–has risen, and has changed the nature of customer relations in a positive way.

Unlike many I’m not the first in my family to go to college.  However, my people didn’t have a problem starting college: it was finishing it that was another story.  When I completed my first degree is was the first completion in my family in sixty four years!  The MS and PhD were without precedent, at least on my father’s side.  While I am a strong believer that we build on what has gone before, we need to go beyond that, and an education is a way of achieving that result.

I am grateful for UTC’s confidence in me and in particular that of the department head (and my PhD advisor) James C. Newman, III.  My teaching geotechnical courses will continue, as will my contributions to this site.  Stay tuned.

 

Posted in Academic Issues

Advice to Graduates: Past Performance is Not a Guarantee of Future Returns

It’s the time of the year when most people graduate from whatever school they’re graduating from.  This is a hypothetical graduation address, aimed a college students.

These days college–especially undergraduate studies–is a long, expensive undertaking, usually accomplished by a large amount of debt.  (Come to think of it, what in our society is accomplished without a large amount of debt?)  And yet, in spite of the long-term obligations that come with it, people continue to put a great deal of stock and effort in a college education.  Why is this?  Most of you know the answer: because jobs and careers opened up by a college education have a higher level of compensation than those that don’t, at least overall.  College seen in this way is an investment, and I’ll come back to the financial analogy.

One thing I’ve noticed while walking the halls of Old Kudzu (“Old Ivy” is more appropriate for places Up North which are not appropriate to speak about here) is the “first in family” thing about college.  There’s a great deal of emphasis on those people who have broken the multigenerational custom of living and dying for a college athletic program without having stepped foot on campus except to head to the football stadium.  As you would expect, an elitist snob like me doesn’t have that experience.  I come from a long line of “college men” whose main problem wasn’t going to college: it was getting to the place you’re at today, i.e., graduating.  Today that’s another obsession of our educational system.  We’re told that our graduation rates are too low, with the implication that those who don’t walk the stage don’t walk the golden path of success in life.  But somehow my ancestors were successful in spite of that fact.

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One that actually did make it to the end was my grandfather, Chester H. “Chet” Warrington, who graduated–after giving his parents much heartburn–from Lehigh in 1912. He’s there on the right, before he actually made it through.

Even though he graduated from the birthplace of Tau Beta Pi, engineering’s highest honour fraternity, he wasn’t much of a scholar.  There have been many changes in the whole meaning of a university education from his day to ours, and one of them is how much more competitive our system–in and out of academia–has become.  In those days college was largely the province of the well-heeled, and the “Gentlemen’s C” was not a dishonourable result.  (I would say that the “Gentlemen’s C” is still very much alive and well on campus today, in spite of the changes!)

But we, as we do with just about everything, have pushed the whole business of academic achievement to the limit.  It’s surely frustrating to most academics that people who aren’t very good students actually have a successful life in this world, as my grandfather had.  It’s even more frustrating that, after all of the glow people put around academia, the money goes elsewhere.  So we’ve had a drumbeat, of late, of how important it is for people to have very high grades, and to correlate (at least in our minds) those high grades with success in life, and ultimately to try to rig the system so that those who do well in an academic setting will be afforded similar success afterwards.

But life neither starts or ends on campus.  And sometimes the reality of life wedges its way onto campus.  A good example of that happened in one of my classes last year, and the life lesson it taught bears repeating.

One of the courses I teach is Foundations.  First question some ask is “Foundations of What?” There are many “foundations” courses on campus to introduce students to a wide variety of subjects, but mine is the Foundations course par excellence: it concerns the design of foundations for real structures such buildings, bridges and the like.  This past year my students convinced me, for their design project, to enter the American Society of Civil Engineers MSE wall contest.  An “MSE” wall, for the uninitiate, is a Mechanically Stabilised Earth wall.  If you’ve driven down the interstate and seen newer walls flanking the roadway, usually with fancy decorations, you’ve probably seen an MSE wall.  The fancy decorations, however, have nothing to do with that: behind the front of an MSE wall is a network of grids and meshes by which the earth behind the wall actually helps to hold it up rather than just trying to push it down.

In this competition, the students build a large wooden box with a removable face.  They then put an MSE wall entirely built of kraft paper and tape behind it and fill the box with sand.  Removing the face, the moment of truth comes when the wall either holds the sand in place, leaks a great deal of sand, or collapses with sand on the floor following.

The class divides itself into two teams, using an electronic sign-up system.  When the team compositions were finalised, the “buzz” around the class was that one team was made up of the “smart” people and the other wasn’t.  I was unconvinced that it was that rigged; years in the private sector and engineering practice gave me the gut feeling that the outcome would not follow the conventional wisdom.

It didn’t.  When the removable panel was in fact removed, both walls held, but the “smart” team had the scarier moment as their wall bulged and leaked considerably.  Conventional wisdom took another hit.  But the whole point of an educational system is to learn something, and there’s a good lesson here.

There’s a great deal of emphasis on the value of intelligence these days.  It’s almost an obsession, really, and permeates our whole system, from child rearing to the educational system itself and ultimately to the credentialling system that marks the road to the top.  Raw intelligence, however, is only one piece of the puzzle.  That intelligence has to be properly applied to achieve the best results, and that application includes two things: an understanding of the environment in which you’re operating and the willingness to put the effort in to attain the goal.  Those two elements are frequently lacking, and I speak from experience: the lack of those two elements have led to many of the mistakes I have made in life.  Although there’s a great deal of talk about including “real life experiences” in an academic course, to be honest time constraints and the same lack of understanding in academics lead many such efforts to fall flat.

Even with the political clout that our financial system has these days, it’s still necessary for those selling financial products to make this disclaimer (or one like it): “Past Performance is Not a Guarantee of Future Returns”.  I think that should be placed somewhere, or at least watermarked, on every diploma issued by institutions of higher education.  Those of you who have finished the course of study can be justifiably proud of what you have done.  But you and the society you live and move and have your being in need to understand that what you’ve done isn’t a guarantee that what you do subsequently will have the golden touch.  The society that believes that and promotes accordingly is itself heading for a fall.  It was the hard lesson that Ch’ing Dynasty China found out the hard way the century before last; we will follow suit if we do likewise, our fall being at the hand of the same Chinese (with others) who did learn the lesson.

Graduation is a time of celebration, but, as the Latin root notes, it’s just another step in life.  The education doesn’t stop here, and by that I don’t mean the continuing education requirements that permeate our professional credentials.  Making the education work is the new task, and in many ways it’s as important–if not more important–than the first.

Posted in Academic Issues

The Raising of the Maine, Cellular Cofferdams, Why Puerto Rico is Part of the U.S., and Why Puerto Ricans are Americans

On this day in 1898 the USS Maine was sunk in Havana harbour, which precipitated (after a great deal of “yellow journalism” on the part of the American press) the Spanish-American War.  This topic is of interest, not only because of its place in American history, but also in the history of geotechnical engineering, as it was an early large-scale application of sheet piling and an early use of cellular cofferdams.

The cause of the Maine’s explosion is still a matter of debate, although the weight of the evidence leans toward some kind of coal explosion.  The Maine used the same type of Scotch marine boilers that Vulcan preferred for its offshore hammers in the 1960’s and onward; coal was the usual fuel at the time.  It was necessary, sooner or later, to get the wreckage off of the bottom of Havana harbour, and that involved a celluar cofferdam.  The following description of the job comes from H.S. Jacoby and R.P. Davis, Foundations of Bridges and Buildings, New York, NY: McGraw-Hill Book Company, 1914:

The cofferdam for raising the “Maine” represents a special type of steel cofferdam, very large and strong.  *”The problem was to surround the wreck of the vessel, lying in about 29 to 37 feet of water, with a cofferdam, which when unwatered would be tight enough to prevent leakage, strong enough to resist outside water and mud pressures, and a protection that would assure safety during the work.  The cofferdam should be self-sustaining, if possible.  Bracing by struts across its interior to resist the water and mud pressures might be difficult to install and would interfere with the operation of removal.  The borings indicated bad conditions for foundations.  The building of a cofferdam without internal bracing, which would withstand pressures from a head of 37 feet of water and practically 21 to 23 feet of mud, was an unprecedented task.

“The cofferdam should be not only self-sustaining and safe against the pressures to which it  was to be exposed, but it should also be capable of complete removal after it had served its purpose.  It should be able to support more or less superimposed loads, for working platforms had to be built upon it.  The work of unwatering the area enclosed had to be carried on from the top of the cofferdam; and afterward, men and materials had to be transferred from there to the interior, for work upon the wreck…The cofferdam decided upon consisted of 20 equal cylinders, 50 feet in diameter, and composed of steel piling 75 feet long…”  A plan is shown in Fig. 71e.

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Raising the Maine, views of the cofferdam, from Jacoby and Davis, Foundations of Buildings and Bridges.

“The length of the major axis of the cofferdam was practically 399 feet, and of the minor axis 219 feet, leaving a 20-foot clearance at the submerged bow of the ship and a 14-foot clearance at the stern, with 45 feet at the side cylinders.  Such clearance was necessary to avoid portions of the wreck which had been blown beyond the position occupied by the hull.

“The units of the cofferdam were made cylindrical for the reason that the extremely high pressures, which would be exerted by the mud filling, would act radially and uniformly on each pile, straining each joint to the same amount at equal depths, and in the entire cofferdam cylinders would deform least from play in the piling interlocks.”*

The cylinders were driven tangent to one another and to insure their stability and prevent leakage of water through them when the cofferdam was pumped out they were filled to the top with clayey material that was dredged from the bottom of the harbor.  A curved diaphragm of steel-piling, as shown in Fig. 71f, was driven to connect the adjacent cylinders, and the space between this arc and the outer surfaces of the large cylinders was likewise filled with dredged material.

The piling used was the Lackawanna section, weighing 35 pounds per linear foot, and had a web 1/2 inch thick.  The piles were driven so that their tops were 2 to 3 feet above normal water level (Fig. 71g) and the 75-foot length of piling, which penetrated the harbor bottom to a distance of approximately 35 feet, was made of two lengths spliced together with channels.

*Bulletin No. 102, Lackawanna Steel Co., Buffalo, N.Y.

Cellular cofferdams have gone on to become an important type of retaining wall structure.  Probably the most significant change from this project is that cellular cofferdams are always built with permeable materials such as gravel and not clays such as were dredged from Havana harbour.  More information on this project and related topics are here:

The wreckage of the Maine wasn’t the only result of the Spanish-American war.  The United States virtually ended the Spanish empire, which had once covered much of the Western Hemisphere.  Cuba became independent.  The Philippines became an American possession (except for Japanese rule during World War II) until their independence in 1946.

Puerto Rico also became part of the United States by military invasion and annexation, and (through a long process) Puerto Ricans became full American citizens.  That’s something I remind my students about every time I teach this subject; an American history lesson never hurt anyone.  And the Puerto Ricans I go to church with (and I have in class) are grateful.

Posted in Academic Issues

The Problem with "Going Dark" in the Technical Literature

When starting out on a major research project in science or engineering, the first thing to do is to go through “the literature” (which usually means the peer-reviewed body of articles and published books, although internet stuff is becoming increasingly important) and try to figure out the current “state of the science” (we used to say “state of the art” but people are less inclined to use that expression than they used to be).  From here we proceed to do new things which will hopefully advance the state of whatever field of endeavour we are operating in.  As I stated in my master’s thesis:

In any investigation such as this the ideal goal is to come up with something truly novel, and many of such works emphasize their novelty to the denigration of those who have gone on before. While in some fields of endeavour this might be appropriate, in this case such sweeping novelty cannot be claimed. This work fits the mould as outlined by Pascal above: it takes the work that has been done before, advances it a step while realizing that there are many more steps before “perfection” is achieved.

But stepping back to those who have “gone before”, the scientific and engineering literature isn’t as transparent as one would like.  In recent years fraud and misrepresentation of results has required any researcher to be careful as to what he or she believes.  There are also situations where stuff that looks really good at one point in time get abandoned later for various reasons; we have to make sure our research takes a long sweep in time as well as topic.  We also have the problem of “non-novel” papers, which are really rehashes of stuff figured out a long time ago but put back into the literature to give glory to someone else.  These don’t do much for the originality reputation of their writers but, sometimes, can be useful, putting back into currency things which have “gotten lost in the shuffle” over the years.

But one serious problem that deserves some attention–and one that doesn’t get a lot of press–is the matter of “going dark” in the literature.  An overview of the pattern of scientific and engineering advance is in order.

Generally speaking, in any given field there are “seminal papers” (usually more than one), which is where the field was kicked off.  From there we have what comes after, which usually refers back to the seminal paper.  In my field of pile dynamics, we have one paper that gets cited in just about everything written on the subject.  From here the science and technology are developed and things advance.  And then, without much fanfare, the literature “goes dark”.

That doesn’t mean that people stop publishing anything on a given topic.  Far from it; however, it’s like a line from Hogan’s Heroes, when Gestapo Col. Hochtstetter tells Klink that he can make Hogan talk.  Klink’s reply was, “You can make him talk.  He just doesn’t say anything”.  A lot of the literature is little better than fluff or promotion of a new idea without substantive detail on how these “new” improvements really work.  The obvious question is why.

One reason is that the material is classified for military or national security purposes.  Generally speaking, however, that literature doesn’t go dark as much as it’s dark to start with and it’s only later when things come to light.

Another reason is that the field has become inactive, usually temporarily.  There are a number of reasons this happens.  In my field, wave propagation in driven piles was discovered in the early 1930’s in Australia, and the English carried out some research later in the decade.  (The Americans got into a food fight on the subject).  But things went dark for a very big reason: World War II, which focused the participants on other matters, such as rational soil classifications and nuclear weapons.  After that conflagration, things resumed and progressed to the current state.

In my experience, however, the biggest reason the technical literature goes dark is because of commercialisation.  In the early stages, the research is the “property” of academic institutions, individuals and the government (especially since World War II) which funds it.  In these conditions there is a relatively free exchange of ideas and expression of these ideas in articles and books.  However, when technologies are commercialised (especially when it’s done by a relatively small number of organisations) things start getting proprietary, and then things start getting secret.  Although it’s possible to have patents and copyrights to protect oneself in some cases, it’s not possible to copyright an idea; it’s easier to simply use trade secrets, even if those trade secrets are derivative from research from more “open” sources.

The fact that a technology can be commercialised is a good thing in that it shows that it works and is useful.  Over time, however, it happens that organisations use institutional inertia and human habit–to say nothing of our tort system, which stifles innovation by punishing experimentation which can go wrong–to make their proprietary method a “standard” and keep its true nature under wraps to discourage its replacement or even improvement.  In time this slows the advance of science and technology in ways that are not obvious to most people.

Researchers who set out to try to advance methods in areas which have “gone dark”–assuming they can get funding for their work in the first place–face a number of obstacles.  First they must realise that beyond the dark literature are doubtless some improvements the nature of which are obscure.  They may find themselves “reinventing the wheel” in an unavoidable way.  If they get past that, they find that they lack the benefit of the learning curve which those who actually use the existing method.  The road to advancement can be a perilous one under these circumstances.

But advancement is what science and engineering is supposed to be about, isn’t it?