Recent content by Dinoduck94

When calculating the dV available from a rocket booster, the below calculation is used: (ISP . g) . ln(Mass when full/Mass when empty) Is 'g' always equal to 9.81 in this equation, or do you use the actual gravitational acceleration that the booster will experience, at it's given altitude, to...

Thanks all for your responses. Agreed that it generally isn't something to worry about, but I don't want to be an engineer that doesn't understand EMI and only looks to solve an issue once it has been experienced. I want to be proactive and to know when I am likely to have an EMI issue, and...

Some Variable Frequency Drive manufacturers (such as Allen Bradley) supply a toroidal Ferrite core to wrap the outgoing cables around to reduce EMF. My question is, if a company doesn't supply a ferrite core, how do I work out if one is needed, and how do I correctly size it? I understand that...

Hi Dullard, Thanks for the response. Are you able to advise what these factors are assumptions of? The descriptions of "k = Enclosure Constant" and "c = Temperature Distribution Constant" don't really provide an explanation to what it's truly representing. Thanks!

Thanks Tom! Such a shame!

Hi Chestermiller, There isn't a diagram that I can produce. The system is exactly as described above. The maths involved with what I'm doing is as per the below; You'll see that all the information that is needed, is easily available - however constants 'c' and 'k' are only retrieved by looking...

Thanks for your reply Sophie, I do not need to achieve any level of reduction, it was just some maths that I was interested in finding out about. In my ignorance, I thought the maths would be: 1) Converting the dB into Watts/m2. 2) Calculating the energy lost in it passing through the initial...

Hi Everyone, this is not a school work problem, I would have stated that if it was - this is a work problem; I want to know how loud my control panel is going to be. I exaggerated the thickness of the steel, so I could see and understand the maths and do the calculation myself with my actual...

What is the mathematics involved with calculating the energy lost from sound as it passes through different mediums? If I started off with a 70dB(A) sound wave, and after 0.5m it passed through 10mm of mild steel - what would be the sound level (in dB) 1m away from the steel plate? To clarify...

When designing a panel, it is imperative that you keep the components inside at a temperature which they can operate optimally at; allowing the air temperature to go above this limit can cause component failure and fire. To assist with calculating the air flow required to keep the components...

I'm watching an episode of "How the universe works" and they explained the nightmare scenario where a star supernovas and turns into a black hole, emitting such a powerful burst of gamma rays, that if it were any closer than 6000 light years then it would be capable of stripping the entire Earth...

Hi Tom, The communication is via Ethernet Cat5; however I feel like the conversation is veering off of my original question. The original question was referring to the interaction of the magnetic flux generated by 2 separate fields: one pulsing and one static; rather than what can be done to...

Hi Berkeman, thanks for your response, I can't say I've experienced it either, but it's "Electrical Engineer 101" when you design a Low-Voltage Control panel; AC frequencies must be segregated from Communication systems so as to avoid inducing voltage on to them - that induced voltage would...

Hi Berkeman, The customer seems to be overly concerned regarding EMC. The panel is entirely mild steel, so any external frequencies aren't going to be a problem; the only source of noise would be AC Mains frequency interaction with nearby communication cables, within the panel. I know steps...

The sum of the fields would be sqrt(a^2+b^2). But my question refers to the interaction of a pulsing magnetic field with a nearby static magnetic field.