Category Archives: Soapbox

Dream Car?

f1When you are young most people would like a car with the performance of a racing car. When you get a little older and have children then you want something with the strength of an armoured personnel carrier in order to keep them safe. By the time you are old enough to have grandchildren, you are worried about whether the world’s resources will still be round for them and you would like a car with the fuel efficiency of the ETH PAC Car II which at 15,212 mpg, or 0.01857 litres/100 km holds the world record for fuel efficiency. In my case the compromise is a Volkswagen Golf, which is an example of the engineering conflict resolution between cost, structural integrity, performance and sustainability discussed in last week’s post [‘Conflict Resolution’ on June 25, 2014].

My colleague who lives in Zürich has an alternative resolution to the conflict. He does not own a car. Instead he has bought shares in a car sharing scheme, Mobility. If he needs a car then he selects a car on-line from those available in the nearest car-park and there 2500 available from 1200 in Switzerland. When I visited him a few weeks ago he picked up a sporty BMW 1 series by using a smart card in his wallet to open the car and said if he had been on his own then he would have taken the little SMART car parked next to it. As my Swiss colleague said if you are the car you drive then he can be a different person everyday.

Conflict Resolution

conflict pyramidEngineers need to be experts in resolving conflicts…

Every man-made device that moves required energy to make it and uses energy when it moves. Heavier devices have greater inertia than small ones and hence more energy is needed to set them in motion – think about peddling an old-fashioned steel-framed bike compared to a modern alloy one. So, designing for sustainability requires engineers to minimise the quantity of raw materials and energy used to manufacture a device AND to minimize its weight if the device moves as part of its function.

Now, here comes the conflict.

Sustainability also implies that devices should have a long, maintenance-free service life so that resources used in maintenance and replacement are minimized. Service life is usually limited by fatigue and, or wear and the probability of these failure mechanisms occurring can be reduced by lowering stress levels. However, stress is inversely proportional to cross-section area and so can be reduced by adding material, i.e. increasing the mass of the device which will also increase its inertia, or resistance to motion. The probability of failure can be reduced by using stronger, more sophisticated materials that are lightweight and almost always more expensive, e.g. composites. Customers also want performance and additional expense might be acceptable if it is accompanied by additional performance – some people will pay for a carbon-fibre frame for their bicycle. Elegant engineering design requires resolution of the conflict between cost, safety and reliability, performance and sustainability.

This is why engineers are trained in conflict resolution or as it is more commonly known: problem-solving.

The Charismatic Engineer

stanfordcloisterEngineers do not have a great reputation for being charismatic leaders or communicators. In both print and speech we have a tendency towards being precise and concise, which often also means boring. However communicating is probably the most important part of the job for many engineers and for this charisma is important. The German historian and sociologist, Max Weber observed that people voluntarily comply with three types of authority: traditional, rational-legal and charismatic. Traditional authority is the type vested in age-old rules and conventions; so not much chance of engineers possessing much of this type of authority. Rational-legal authority derives from the bureaucratic or administrative system, the ‘laws’ enacted by it and their implementation by those appointed within the system; so again not much hope for engineers except within some engineering organisations. Charismatic authority is possessed by individuals who appear to be extraordinary or have ‘at least specifically exceptional powers or qualities’. I think engineers have a decent chance of this last type of authority. As a profession, we have pretty extraordinary powers. Just look at our ability to provide round-the-clock water, food, energy, shelter and transportation in densely populated cities. Never mind adapting systems to cope with natural disasters or designing vehicles to land on Mars. So as individuals we need to develop exceptional qualities of integrity and communication, if we want society, or even just the CEO, to listen to and accept our advice.

Many engineers will shy away from the line that I have expressed above, preferring to hide in the test lab or behind their computer screen. This is in part because engineers are trained as problem-solvers and solving problems often requires a degree of solitude and silence that is not compatible with high profile communication. This conflict is shared by many scientists, who are often judged by their publication profile rather than their scientific achievements in part because it is easier to count publications that to assess the significance of achievements. Some of us enjoy the solitude of writing blogs, lectures and papers. I find the process deepens my understanding and goes a long way to resolving the conflict between communicating and problem-solving. However, it can be difficult in a modern professional life to create the necessary calm for problem-solving creativity.

Marily Oppezzo and Dan Schwartz at Stanford University have shown that taking a walk can stimulate creativity. So perhaps monks knew this when they built magnificent cloisters adjacent to many great cathedrals and monasteries in Europe. However, you don’t need a beautiful set of cloisters, the Stanford researchers found that creativity increased by the same amount whether their subjects strolled in Stanford’s lovely leafy campus or walked on a treadmill opposite a blank wall. So next time you feeling challenged by the preparation of a charismatic talk or you are stuck solving a problem, take stroll. The Stanford team found that eight minutes was enough to produce an appreciable improvement in creativity.

And oh, yes. Don’t forget to leave behind all your electronic devices when you walk. Their silence is crucial. See my post entitled ‘Silence is golden’ on January 14th, 2014.

Sources:

Robert P Crease, ‘Critical Point: Why don’t they listen?’ Physics World, May 2014

Max Weber, ‘Economy and Society’, 1922

Gretchen Reynolds, ‘Take a walk to stimulate creativity’, INYT, May 7th, 2014

Oppezzo, M., J. Schwartz, D., Give your ideas some legs: the positive effect of walking on creative thinking, Experimental Psychology: Learning, Memory & Cognition, April 2014.

Felicity Mellor, Shhhh?  Scientists need to talk about not talking, The Guardian Newspaper blog January 15th, 2014 also The power of silence, Physics World, April 2014

Are electric cars back?

roadchaosDid you know that before Henry Ford developed the Model T Ford motorcar, the nearly 40% of automobiles on US roads were electric vehicles? I think we will be heading back in this direction if we are to have any hope of achieving reductions in carbon dioxide emissions. The implications for the national electricity grid of a major shift to plug-in cars would be very serious and has been the subject of several recent studies including a third year undergraduate dissertation that I have been supervising and from which came the opening factoid.

It is relatively easy, through not without obstacles, to envision a shift to all-electric cars; after all there are several models on the market now. However, an all-electric aircraft seems further in the future, if only because of the weight of the batteries required. Engineers would talk about the energy density, i.e. the amount of energy that can be extracted from a kilogram of kerosene compared to a kilogram battery. However, perhaps the future is not far away because the New Scientist reported earlier in the month [3rd May, 2014] that Airbus had completed the test flight of an electric plane, the E-fan. It is a two-seater plane with a pair of 65 kilogram lithium battery packs driving a pair of 30 kilowatt motors attached to the fans. The E-fan will cruise at 185 kilometres per hour and flies for an hour. Relative to a modern computer jet, this performance is similar to the early plug-in cars relative to their internal-combustion-engined rivals. But, it is an indication of bigger things to come. In the meantime, if you want an E-fan then a new division of Airbus called Voltair will be producing them by 2017.

I mentioned undergraduate dissertations because they have filled a sizeable chunk of my waking hours for a few weeks. This is an annual ritual in the UK during May when final-year undergraduate students are busy submitting and defending their dissertations. I had a pile of twelve dissertations to read and assess. Eight of them belonged to students that I have supervising in weekly one-to-one meetings since last October and the remainder were dissertations for which I was the assessor. All of the students that I supervised were studying either Mechanical or Aerospace Engineering and so the topics of their projects were associated mainly with energy and, or transportation. Some of these projects are provided by engineering companies (those with an asterisk in the list below), which guarantees their topicality and relevance, while others spin-out from my interests and research activities. So many of the topics in the list below will come as no surprise to regular readers of this blog.

Dissertation projects supervised during 2013-14:

Investigation into a redesign of graphite re-entrant seals for a nuclear power station*

Conceptual design for a carbon sequestration system for automobiles

Recommendations for achieving a low carbon airline industry

Strain-based defect analysis of industrial pipe-work*

Investigation of random frequency excitation of an aerospace body panel

Assessment of preload control of threaded fasteners in motorcycle production*

Recommendations for technology-based approaches to reduced ecological footprints

Investigation of low carbon power for plug-in electric vehicles