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    I Boundary Regions in LAMMPS MD Simulation

    Hi, I'm working on a project using LAMMPS. I am very new to the software and find the documentation doesn't always answer the fundamental questions I have. I noted previous LAMMPS queries were posted on this forum, although I am from a mechanical/materials engineering background. I am trying...
  2. M

    Kerr Diagrams for Defect Frequencies

    I am currently undertaking a module in Failure Analysis, one topic of which is vibration monitoring of bearings. During this study, the notion of first and second Kerr diagrams as a tool for analysis came up. I have been trying to find additional information on Kerr diagrams; however, outwith...
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    Block Diagram Reduction - Control Systems Engineering

    Homework Statement Determine the closed loop transfer functions of the systems shown below: Homework Equations Standard block diagram algebra. The Attempt at a Solution I've moved the take off point such that the diagram now looks like: I am having difficulty determining G1(s). The...
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    Calculating Transformer Input Voltage

    Hi, Thanks for the reply. I should have probably clarified that in this case, Z1 = Rc // Xm and Z2 = X1eq + R1eq + a2ZL I have no issues with complex numbers or the numerical computations; I suppose what I was referring to by 'efficient' was that in the original question, there was no...
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    Calculating Transformer Input Voltage

    Homework Statement Calculate the primary current, and hence the voltage at the transformer input winding, V1. Transformation ratio, a = N1/N2 = 0.1 R1 = 0.12 Ω; R2 = 12 Ω X1 = 0.4 Ω ; X2 = 40 Ω RC = 560 Ω V2 = 2300 V RL = 1 kΩ 'Xm = 800 Ω' Homework Equations R1eq = R1 + a2R2 X1eq = j(X1...
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    Engineering Calculating Voltage Source in AC Circuit

    Hi, Thank you for your reply; it helped confirm my understand of the problem solution.
  7. M

    Engineering Calculating Voltage Source in AC Circuit

    Hello, I'm currently working on a problem involving the calculation of an unknown voltage source of a circuit containing a resistor, inductor and load in series. Unfortunately, the problem sheet does not give an answer at the end, so I am unsure as to whether my approach is correct -- hence...
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    Engineering Specialization - Advice Needed

    Hi, I'm an undergraduate engineer currently studying mechanical engineering. The first two years of my degree are core for all mechanical engineering students; however, at the end of second year, I have the option of taking a specialism in electrical engineering, offshore engineering, or...
  9. M

    Fluid Mechanics: Pressure Question

    I am unsure of how I would calculate the volume -- which is particularly annoying, as I am aware that would solve my problem by application of the ideal gas law.
  10. M

    Fluid Mechanics: Pressure Question

    Homework Statement A tyre pressure gauge indicates 20 N/cm2 for a tire at 34°C after a fast motorway run. Assuming that the volume of the air in the tyre is constant, atmospheric pressure is 760 mmHg and the air gas constant is 0.287 kJ/kg.K: i) Estimate the indicated pressure when the tyre...
  11. M

    As Simple Hoist System Problem - Given Answer Wrong?

    Ah! I see that now. I need to be a bit more careful when reading the question! Thanks a lot.
  12. M

    As Simple Hoist System Problem - Given Answer Wrong?

    Homework Statement A colliery lift cage can be considered as a simple hoist system. An investigation found that when raised from the bottom of the mineshaft, the cage accelerates uniformly for 10 seconds, travels for 70 seconds at constant speed of 3 m/s and just before reaching the pit head...
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    Dynamics Module - Kinematics Problem

    Thanks. I'll be sure to brush up on differential equations and hyperbolic functions so as to better tackle problems of this sort. That makes a lot of sense, thank you. That approach from the Lagrangian formulation is really helpful.
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    Dynamics Module - Kinematics Problem

    Hi, Thanks for the welcome and reply! This module hasn't used a second order ODE treatment for the problems -- so I hope that isn't what I'm expected to do... haha!
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    Dynamics Module - Kinematics Problem

    Thanks for the reply. I had assumed that the question was saying that a is proportional to s, and after looking back at the lecture notes for this tutorial, I have been playing around with the idea that if a = s then v\frac{dv}{ds}=s Rearranging and integrating: $$\int_{u}^{v} vdv =...
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    Dynamics Module - Kinematics Problem

    Hi, I have an basic kinematics problem I can't seem to grasp -- hopefully someone can shed some light on it for me? The acceleration, a, of an object is equal to a=s, where s is the distance from the start position. Sketch a graph representing velocity against distance, s, for the...
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