Continue to Site

Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

  • Congratulations waross on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  1. GregLocock

    Electric "missile" type UAV/Drone

    PK in fact
  2. GregLocock

    Electric "missile" type UAV/Drone

    Possibly, there again this will have the worst performance of any possible configuration except for flapping wings. People in the past have got into trouble for designing cruise missiles and the like (which is not very difficult if you are after minimum viable product performance), I think we...
  3. GregLocock

    Things are Starting to Heat Up - Part XIV

    In which dik either demonstrates a complete misunderstanding of %ages, or knows damn well what he is doing and uses them to mislead (a politer version of what I initially wrote). See post 132. The %age is dropping slightly, the coal use is increasing, as Tugboat said.
  4. GregLocock

    Seeking Guidance on Learning to Use ACOEM ONEPROD Vibration Analyzer

    B&K produce an excellent series of manuals and technical notes on signal analysis in general and vibration monitoring. The HP/Agilent intro is also fine...
  5. GregLocock

    Paths to 100% renewable power, globally

    True but does not support your easily disproved claim. Their coal consumption is increasing. 95% of the coal power stations being built are Chinese. Here's the graphs for China
  6. GregLocock

    Paths to 100% renewable power, globally

    The Guardian spills the beans on new power stations in China (yes they are retiring a few as well) https://www.theguardian.com/world/2023/aug/29/china-coal-plants-climate-goals-carbon
  7. GregLocock

    Paths to 100% renewable power, globally

    I wonder why dik keeps pushing this lie. It is easily refuted. Here's what the AI thingo says China is the world's largest coal consumer, using more than half of the global total. While coal consumption has been relatively stable in recent years due to slower economic growth and government...
  8. GregLocock

    Paths to 100% renewable power, globally

    It's cheap and easy apparently https://yle.fi/a/3-10736252 . No mention of the costs of storage or transmission lines. You can do it in Kazaqkstan Transition towards a 100% RE-based energy system was modelled for five scenarios considering different energy system structures, from a limited...
  9. GregLocock

    Snap Fit Design - Insertion Force and Bending Force

    "Another reference.. slightly different equation" That word slightly is doing a LOT of work. Consider the case where mu=1 and alpha = 45 degrees. (this makes me think the - sign in the denominator is correct)
  10. GregLocock

    Electric "missile" type UAV/Drone

    Well you work through the equations. It isn't rocket science, but there again most rocket science isn't rocket science.
  11. GregLocock

    Spain and Portugal power grid collapse

    yup 3 posts. You are currently in the 2nd page of the thread.
  12. GregLocock

    The wheels are falling off the Net Zero Bandwagon 2025 edition

    In South Australia's case (2016) they installed natural gas generators, and hospitals and the like added emergency generators. It also flushed out the errors in configuration of the software for the windfarms. Since then they've also built another interconnector back to the coal powered NEM as...
  13. GregLocock

    Strain energy on impact

    So I've got 5 spring/masses in series, dropped from 1m. SDOF approximation using Gautam's equation m1dof = 1.0103 k1dof = 3.9898e+08 freq1dof = 3162.8 h1dof = 1.0000 Force1dof = 8.8931e+04 max force at ground from 5dof model ans = 9.7014e+04 So this ties up reasonably well with the FEA...
  14. GregLocock

    Strain energy on impact

    Well yes, in your dynamics textbook or lecture notes. Here's a long article that manages to avoid using differential equations, but only because he uses FEA to derive the correct equivalent mass. https://blog.ozeninc.com/resources/anatomy-of-a-mechanical-impact
  15. GregLocock

    The wheels are falling off the Net Zero Bandwagon 2025 edition

    In a success story for the transition to Net Zero, on April 16 Spain's grid was 100% renewable for a full day. In a rather large step backwards the grid collapsed across large parts of the Iberian peninsula and even into France, on the 28th. I suspect they'll blame the software like the...
  16. GregLocock

    The wheels are falling off the Net Zero Bandwagon 2025 edition

    Not helped by a generation of journalists that 'write' articles by cutting and pasting press releases. I wrote to one pointing out various errors in her story and she responded 'but that's what the press release said'. That was in the Business section which you might hope had a bit of an...
  17. GregLocock

    Strain energy on impact

    3 is a very big spherical cow. And no, that is a very horrible approximation, you've assumed it behaves like a point mass on a spring the real issue is that it is a continuous system.
  18. GregLocock

    Electric "missile" type UAV/Drone

    Two propellers in series will not be very efficient, although I suppose if you increase the pitch of the second it might help. Putting a 2 bladed prop into a tube turns it into a ducted fan of sorts.
  19. GregLocock

    Strain energy on impact

    Conceptually think of the bar as a series of springs and masses. As the mass hits the ground the spring above it compresses, and so on and so forth up the chain of springs and masses. As you can see there's a series of compression and rarefaction waves set up in the system. It looks like it...
  20. GregLocock

    How do professional estimators deal with scope creep in real-world projects?

    "It used to be the case that large EPC contracts would be bid at cost or even below and the contractor would make his profit on the variations and additional work." One company I worked for had this down to an art form. Bid at almost zero profit, then encourage the customer to upgrade the design...

Part and Inventory Search