Pengwuino - I would agree but it is not an easy task. There are cost issues, space and weight issues, etc. to hash out. What systems are mission critical and to whom? With the current budget getting tighter and tighter, cost savings are the driving factor in how much testing is done and how much...
Bio... I would guess the question of directivity and shielding of our own weapons and support system comes into play here. I don't think we have a warm fuzzy feeling about our own systems survivability during an EMP event. An EMP burst is pretty indiscriminate. People hate spending what we do on...
just a quick note to the original poster, as a DOD employee I feel the urge to tell you the area you are looking at raises big flags with the Mothership. EMP events and work in general is a very controlled study for good reason. This doesn't preclude working with EMP devices but in the present...
Three good references are:
1. Intro to Electromagnetic Compatibility by Clayton Paul
2. Noise Reduction Techniques in Electronic Systems by Henry Ott
3. Electromagnetic Compatibility Handbook by Kenneth Kaiser
The first two are required reading for EMC/EMI engineers (or should be!). The...
apple and oranges... with planes you are trying to create a low radar profile. With subs the question of stealth boils down to platform noise. The shape of the hull/sail, minimizing cavitation on the screw, and keeping machinery noise to a tolerable level (off platform radiated acoustics)...
Artman is correct, structural/mechanical for hull and machinery design. I would look at learning AutoCAD, most if not all builders are doing the arrangements of equipment using modeling. The Virginia Class subs were designed using V/R techniques. You could expect to be designing anything from...
Being in the business, I would say that the brunt of the engineering is done by EE's and ME's (85%). In a lot of cases it comes down to who is available to work the project. We need someone to work on designing a "X" and although you have never designed an "X" before, you have been picked to do...
Just a quick note from the pro audio slant. most big rigs used for concert sound operate from about 40Hz to anywhere from 100Hz to 200Hz. the upper cut off is determined by either
A. spectrum analysis of the room or space or
B. the techs ears
We try to set up the system to have the cutoff...
I feel that all information is good information. you never know what direction your work will take you. if you had told me I would be working in electromagnetics when I was in college I would have laughed it off, but here I am...
buoyancy... maybe need to trap enough air at the base of the target to offset the force. You could increase the size of the "cross" and make crossed pontoons, maybe from 8-12" sonotube, it should degrade (BTW are you in saltwater?). Paper mache (sp?) the ends closed. To join the tubes in the...
Buoyant Cable Antennas have been used around the submarine service for quite some time. do a goggle search on the topic and you will find a wealth of info. Most BCA's are made for VLF/LF reception allowing them to be on the order of 1000' in length.
KC
60dBuA is equal to 1mA. Mr. Garvin is correct, you would use 20Log, 10Log is used for power (or more correctly the ratio of 2 powers). for every additional 20dB, add a factor of ten. 80dBuA is equal to 10mA, etc.
KC
Electromagnetics, what a concept.