We are developing a new product. It uses off the shelf components in ways that differ from typical usage, so it is hard to get accurate information about component life. Because the design is still being refined, we will not be building and testing multiples for a while. Is this too early in the...
I am looking for a global map that shows the areas of world which have active offshore oil & gas operations, and that also indicates how much activity is going on. It just needs to communicate where oil & gas activities are taking place in the world ocean.
If you could suggest a link or source...
I know how to estimate the 100-year wave height from a time series of wave measurements, but not how to estimate the wave period associated with the 100-year height. Let's say based on a 20-year time series of sea surface elevation measurements, the 100-year height is estimated to be Hs=15m, but...
I am trying to calculate the daily C02 emissions from a ship following this EPA report. Table 5-1 lists the C02 emission rate to be 44.1/(Fractional Load) + 648.6 in units of g/(kW-hr). Here are my questions,
1) What does the kW in the units represent? The ship engine's power output? My...
This question concerns a property of the directional wave spectrum, namely the one-sided directional width (sigma), which describes the amount of directional spreading of waves. Sigma is like a standard deviation of the wave direction. There are other ways to measure directional spread but sigma...
I am about to transition from being an engineer to managing a small group of engineers. I would love recommendations for books, professional organizations, or other resources on managing an engineering team. I really liked this article. Presently I plan out and manage my own efforts, but soon...
Can someone point me to a standard for mooring design that ensures that marine mammals do not become entangled? I am thinking specifically of a bridle or other "closed loop" in a mooring system, and want to know what loop diameter would be large enough that marine mammals cannot become entangled...
I am using the helpful package WAFO to estimate a survival load for a structure, but I am having trouble interpreting the results.
Background:I have a measured time series of the load, and I identify peak values using the "peaks over threshold" method. The identified peaks are then fit to an...
In thread311-297005, I asked about the standard use of a 3-hour return period to determine the maximum load occurring in a 100-year storm (e.g. Hs=15m). The underlying assumption is that when a 100-year storm occurs, you want your structure to survive the worst load expected to occur if the...
I need to calculate the mechanical wear of a machine. I have the velocity and applied force (load), and have been told to approximate Wear as ([Cubic mean load]^3)*Velocity*[Duration of wear], which would give units of (Newtons^3)*meters. Are these the right units for wear? Can these units be...
In a rope manufacturer's catalog, there are two kinds of minimum breaking strength (MBS) listed: SRT MBAS and ISO/BS EN919 MBS.
What do the acronyms SRT and ISO/BS EN919 refer to? I think the first one assumes the rope is spliced, and the second is some official criteria, but I'd like to know...
We are considering different water depths for deploying a moored structure which must survive a 100-year storm. I am concerned that in the shallower depths (>25 m), survival loads will increase because more of the large waves will break and 'slap' the structure (greenwater).
1) Are there...
Just read a job posting for a MetOcean analyst that requires that applicants 'have achieved or are working towards chartered status'. If this rings a bell, can you please answer:
* For US marine scientists (PhD in Oceanography), what organizations grant chartered status?
* What is usually...
Can someone please cite the reason that a design load is based on its maximum value during 3 hours of a 100-year storm? In other words, why is the storm duration assumed to be 3 hours. Is the most intense period of a storm expected to last 3 hours, even though the synoptic time scale of storms...
I am looking for an information source that will show which regions of the world are worse for marine fouling (i.e. buildup of mussels on near-surface structures such as navigation buoys). The ideal data source would be a global map of mass per year of marine fouling, but I am happy to seek out...
Can anyone point me to general guidelines on how far offshore you'd have to go for the following to be comparable or less than conditions in a 100-year storm:
(1) Change in water depth due to tsunami
(2) Currents associated with surging / retreating crest
I have found recommendations that boats...
I am using the software OrcaFlex to model a mooring system. The twisting of the lines is not important to the dynamics, so I want the model to ignore torsion. The OrcaFlex manual isn't clear how to do this. Do I just set the line's torsional stiffness to zero?
