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  1. K

    B Could Archimedes' problem have been solved a little differently?

    So my proposal is theoretically correct, but practically difficult. Perfect thanks!
  2. K

    B Could Archimedes' problem have been solved a little differently?

    When I was reading this page to understand Archimedes' 'story' I got a question: http://hyperphysics.phy-astr.gsu.edu/hbase/pbuoy.html#buoy According to the example shown, Archimedes found the density of crown by finding the apparent weight. What if he had just measured the volume of water...
  3. K

    How to solve spring mass damper system manually?

    I was a poor student in math and I am paying for it now :|
  4. K

    How to solve spring mass damper system manually?

    Sorry my bad. Yeah the characteristic equation. Once we know it is a second order differential equation, is it no longer needed? Can we describe the whole system with the assumed solution "x = Ce^(λt)"?
  5. K

    How to solve spring mass damper system manually?

    Despite of the fact that I am completely out of touch with electrical engineering, I will try to understand as much as I can. Thanks a lot for suggesting me a good analogy.
  6. K

    How to solve spring mass damper system manually?

    Thanks BvU. I referred to the "solution" page you recommended where they start solving the differential equation assuming the solution is of the form "x = Ce^(λt)". So if this equation directly gives a simple solution for the position of mass x, the 2nd order differential equation that includes...
  7. K

    How to solve spring mass damper system manually?

    The other day when I solved a spring mass damper system in Matlab, I was curious how in olden days would have people solved the equation. We all know the 2nd order differential equation of the system: However if I know the time, damping coefficient, stiffness and mass, will I be able to find...
  8. K

    Job Skills What next for manual gearbox design engineers?

    Simple questions are sometimes difficult to ask. I am a mechanical design engineer of automotive gearboxes with a UG qualification and 12 years of experience. My core expertise is into gears and special interest in NVH. In the recent years I see the automotive OEMs cutting down research cost of...
  9. K

    Will steam generated inside an oven not break it?

    Honestly, I am pretty sure this won't be an interesting taste to the people other than the south part of India [:rolleyes:] Yet I will provide a link: https://simmertoslimmer.com/how-to-make-soft-idlis/ P.s. - This is not a sweet one. Apologies if you were deceived by the word "cake" :-p
  10. K

    Will steam generated inside an oven not break it?

    Thank you all! The rice cake turned better than I expected. This forum has now given me an easy and quick method to repeat my traditional food in a new place :) Like @Lnewqban said, the upper layer of the cake was a bit hard perhaps because of the radiation it received. I plan to cover it with...
  11. K

    Will steam generated inside an oven not break it?

    Clear! I am planning to take a trial today. Will update here tomorrow :)
  12. K

    Will steam generated inside an oven not break it?

    Is there a way we can check? Are these vents (or leakage points) visible?
  13. K

    Will steam generated inside an oven not break it?

    Hi... I am really sorry, I don't know the dishes or recipes you are talking about. The way I used to cook these rice cakes is by allowing a continuous steam leakage. Do ovens also have that leakage possibility?
  14. K

    Will steam generated inside an oven not break it?

    Radiation is not wanted here. I agree that this is a bad idea then.
  15. K

    Will steam generated inside an oven not break it?

    I really have no idea. And that's exactly my question.
  16. K

    Will steam generated inside an oven not break it?

    Disclaimer first: Though the question is around cooking, IMO it certainly is to with physics / engineering. Yet, if the admins find this post inappropriate, pl. delete it. I am planning to make some rice cakes which is prepared by steaming a mix of rice powder and water. Because I don't have...
  17. K

    Automotive Modal analysis - Input and boundary conditions given?

    Thank you! I will try to understand with the help of this equation now.
  18. K

    Automotive Modal analysis - Input and boundary conditions given?

    Thank you Thank you for the detailed reply. I will indeed learn more from online resources. My basic question is in a simple spring mass system, we at least have a directional constraint assumed in the calculation. For example, spring is assumed to vibrate along its axis. But on a random...
  19. K

    Automotive Modal analysis - Input and boundary conditions given?

    My understanding in modal analysis is very limited. All I know is it helps to find a specific mode of vibration and the natural frequency corresponding to it. While I was discussing about this with my NVH team colleague, he told me that there is no force input or excitation input given to a...
  20. K

    I Palmgren-Miner equation derivation

    Summary: This equation is used in ISO standard ISO 6336-6. I want to understand how it is derived. This equation helps to consolidate damage caused by multiple torque, cycle bins. A bin means a torque applied for a given number of cycle. As an outcome of the equation, a single equivalent...
  21. K

    MATLAB Spring mass impact system in Matlab - How to correct it?

    @RPinPA - I tried this in Simulink and there is actually a progress: However, I see some form of dampening effect in all position, velocity and acceleration plots. I am unable to understand the reason for this. This is my simulink model: The initial condition (40) tells that dx/dt = 40...
  22. K

    MATLAB Spring mass impact system in Matlab - How to correct it?

    Thanks a lot. I will try this and update you.
  23. K

    MATLAB Spring mass impact system in Matlab - How to correct it?

    Thank you for your inputs, RPinPA. While I understand force based equation will give me sinusoidal displacement output (as mentioned in the youtube link in OP), I have two questions that I need a clarity: 1. Why will the energy based governing equation not give correct displacement values? It...
  24. K

    MATLAB Spring mass impact system in Matlab - How to correct it?

    I am new to Simulink and I wanted to start practicing using a spring mass damper system. My first tutorial was this: Later, I wanted to model a spring system where a mass moving at a known velocity hits the spring. The governing equation and a similar modeling method given in the previous...
  25. K

    How to find the deceleration of a mass colliding on a spring?

    Yes, I later realized I should have given the subscripts correctly.
  26. K

    How to find the deceleration of a mass colliding on a spring?

    But I don't know either acceleration or x. All I know is the time t.
  27. K

    How to find the deceleration of a mass colliding on a spring?

    Problem Statement: A known mass at a know velocity collides on a spring of known stiffness. What is the equation that governs the deceleration of the mass, so that the force on the spring could be found? Relevant Equations: 1/2 m*V^2 = 1/2*k*x^2 + 1/2*m*(Vo)^2 Kinetic energy of mass before...
  28. K

    Automotive Mathematical modeling of driveline impact test of an automobile

    I have started thinking in the exact same way. You can look at my post in another forum: https://tinyurl.com/y68lp292 Now the challenging part is to find how fast is the stored potential energy drained through clutch. If someone can give me the direction to solve the questions asked in the...
  29. K

    Automotive Mathematical modeling of driveline impact test of an automobile

    Thanks Baluncore. I can't assume gearbox input shaft speed as zero as you correctly mentioned that it will mean the torque to be infinite. My very purpose of doing this activity is to find the closest accurate torque at gearbox input shaft.
  30. K

    Automotive Mathematical modeling of driveline impact test of an automobile

    I am in a process of making a mathematical model of an automobile driveline validation procedure called "Driveline impact". In this test, after the engine in cranked, first gear is selected. While clutch pedal is still pressed, engine rpm is raised unto its max. torque deliverable speed. In this...
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