Recent content by mholland

  1. M

    Calculating Relative Velocity in a Rotating Beam System

    I've attached a drawing, simplified of the layout of the system I'm working on. I've figured out a function to give me the length of the beam 'x' for a given angle, easy enough, but i need to know the velocity that the end of the rotating beam moves relative to the lower fixed end, so the rate...
  2. M

    Understanding the Differentiation of the Cos Law Equation

    is it just c dot=0.5(a-bcosθ)-1/2.(bsinθ) ?
  3. M

    Understanding the Differentiation of the Cos Law Equation

    I'm struggling here as I've not done diferentiation in a few years. The cos law states: c=(a2+b2-2abcosθ)1/2 I'm trying to figure out how to differentiate this, so if c were a length, what the velocity with which c grows as θ increases (ie c dot) Any pointers would be great! If its easier, a...
  4. M

    Designing a Damper: Needing Guidance

    The short .3m vertical red strut is stationary, and the long 1.3m (and the red triangular attachment) are rotating clockwise, with the ends of the damper attached where shown
  5. M

    Designing a Damper: Needing Guidance

    Thanks for taking the time to reply, for the red bar, say 20cm (i'm still waiting on cad drawings for accurate measurements), and yes the .3m post is fixed Yer gravity acts downwards and there is a spring, which is the main slider tube shown below, forcing the bar to rotate as it extends. The...
  6. M

    Designing a Damper: Needing Guidance

    Hi I'm a bit stuck on a problem I'm trying to figure out. I am trying to design a damper, the layout is show below: (apologies for the poor 'cad' drawing!) So far i know: I for the beam, how much energy needs to be absorbed by the damper (4500j) and the stroke (15mm). The maximum loading...
  7. M

    How to Calculate Damper Specifications to Absorb Energy and Manage Load?

    Homework Statement I am trying to design a damper but am struggling with some calculations. The layout is shown below The two red beams are fixed length, with the longer beam rotating clockwise around the blue pivot The specification I have to go on is that the damper has to absorb 4500J...
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