Even if you are only interested in a comparison between two competing designs, I strongly recommend you to go for a full scale test, specially because it is possible to do. This will give much more substance to your research and will probably save you time and criticism.
I understand, but by working with the wrong units, the calculated force is 1 order of magnitude higher. By the way, even calculating with the wrong units, the answer should be 2x10^7 N instead of 2x10^8 N, which leads to a total error of two orders of magnitude higher.
I see that you are...
The book is "Roark's Formulas for Stress and Strain" and the equation comes from Table 14-1, chapter 14, p.702 (7th edition, 2002).
For background information, look for hertzian stress or contact stress.
I will try to clarify based on DNV standard OS-F201 Dynamic Risers (http://exchange.dnv.com/publishing/Codes/download.asp?url=2010-10/os-f201.pdf" [Broken]). In fact, there are no explicit requirements to design based solely on a time domain analysis, but there are three interesting tables on...
I did not state that, what I am saying is: "Often, frequency domain analysis cannot be replaced by a time-domain analysis".
You are very right here, except that you are implying that by linearizing you are inevitably\permanently losing the analysis accuracy, which is not always true...
The decision whether to go for a frequency domain analysis or a time domain analysis is not straightforward, and there are some main factors you should account for. I will try to summarise, but beware they will not be enough to assure anyone that the "best" approach will be attained.
Often...
As you stated, Neptune and Uranus are unarguably invaluable to science for several reasons and the community knows it, but have been left out of probe missions due to current propulsion technology limits and budget.
There are future missions planned to be launched around 2020 and beyond, but...
Given the right conditions, this "jetstream" from a blowout, have a greater probability of sinking the overpassing boat, due to a sudden loss of buoyancy caused by the water vapor and the mixed expanding gases reaching the surface, rather than actually sand blasting the hull.
On the Southern Hemisphere, the Harvest Moon was on March. How could you see the moon larger on the Northern Hemisphere, on August, while it had a normal size for viewers on the South, and vice-versa on March ...
Not exactly, load the second video and seek to 01:44, look carefully at the glider, what do you see ?
Please, continue reading this post after you did that.
In the first video you can see the delta gliders soaring, and feel their instability under low speed, which is expected. Danger might add...
russ_watters is right. The BOP knives must have the force to cut through the drilling column.
Any accidental closing is always undesirable, because going back to drilling means running lengthy systems and equipments checkups and also one would have to face the problem of trying to fish the...
Also, look for Hertzian Stress, Tribology and Wear to get a better view about this interesting subject.
What is the required factor of safety for the contact stress you found?
Usually, the allowable stress is 4 for linear contact and 5.5 for point contact, but this varies a lot depending...
Hydrostatic pressure limits the amount of kinetic energy transferred to the end-cap, as the water will not push the end-cap further after the breach, instead, the water will drop and flow to the ground. If the flow rate is too high, the water flow will become as hazardous as the end-cap...
You're welcome.
For this to work, you cannot restrain more than one degree of freedom. A simply supported boundary condition will restrain only the vertical direction.
If your only criteria is yield stress, not deflection, neither fatigue life, nor weight or cost and not manufacturing. Then you are solely talking about Factor of Safety. In that case, design two will handle more accidental loads than design one, under the same requirements.
The original Titanic was about 883ft long and DWT 46,328t. Today, the largest in service ship, in length, is the containership Emma Maersk with 1302ft and DWT 156,907t. But the record is held by the tanker Seawise Giant with 1504ft and DWT 564,763t, unfortunately already scrapped.
Try this chart, you might find a better one elsewhere:
http://www.engineeringtoolbox.com/fluid-density-temperature-pressure-d_309.html
To solve the problem:
What is the water density and, therefore, the water mass ?
Can you now tell the combined mass ?
What do you have to know to estimate the...
I tried http://www.efunda.com/formulae/solid_mechanics/plates/calculators/SSSS_PUniform.cfm#Results and got 53.3nm for mxn=32x32 which agrees with your result.
I solved the problem with CosmosWorks shell elements and got 53.35nm. Are you working with shell or solid elements ? I tried with...
According to the rules, flywheels are not allowed. If you implement a propeller, it will act as a flywheel also, even with a very low energy storage capacity and your design might not be allowed in the competition.
Also, the power source is the same both for the wheels and the propeller...