Recent content by hermano

Thanks. I will take a look at it.

Hi, Is there a simple formula to calculate the lateral stiffness of a compression spring when both ends stay in parallel (see figure)?

Hi, I have a bottom plate resting on a table (see figure in attachment). On top of this bottom plate is are series of springs and on top of it rests a top plate. Between the bottom and top plate (inside the springs) is a seal to create a vacuum chamber. Question: what is the total force acting...

Thanks! That's the error I have made.

f(x) = (1-x)^(1/2) -> f(0)= 1 f'(x) = (1/2)(1-x)^(-1/2) -> f'(0) = 1/2 So the Tyalor expansion will become: (1-x)^(1/2) = 1 + (1/2) (x) and not (1-x)^(1/2) = 1 - (1/2) (x) as when I replace x by (-x) in the Taylor expansion for (1+x)^(1/2) Or what do I wrong?

Thank you DrClaude. Can you also help me to simplify the following equation using the Taylor series: (R^2-e^2 \sin^2 \theta)^{1/2}

Homework Statement In a paper I have found there is a simplification of an equation which I do not understand. How did they do this? Can someone explain this step by step? Homework Equations The euqation is as follows: X = e \cos\theta + \sqrt{(R^2 + e^2 \sin^2 \theta)} X =...

I want to calculate the total uncertainty. So I think you have to add them, but I am not really sure as they are independent. But that is the question of my whole problem. How do I have to "combine" the probability distributions from the various error components? Uncertainty is the component...

With error component I mean the error source. For example, you measure the length of a bar. Then there are different error components/sources (or uncertainty components) which contribute to the total measurement uncertainty such as, the limited resolution of your ruler, the thermal expansion of...

Hi, I'm comparing different measurement methods. I listed and derived an equation for each error component per measurement method and calculated the probability distribution using the Monte-Carlo method (calculating each error 300.000 times assuming a normal distribution of the input...

Dear, Can someone tell me with certainty if the truncation error of the general ADI method is of seconder order in time and space?

Hi, Stupid question: the Navier-Stokes equations, do they only consist of the equations for a statement of the conservation of momentum or do they also include the equations for conservation of mass (continuity equation), conservation of energy and an equation of state? Thanks.

Homework Statement Hi, I want to calculate the relative error between two complex numbers. Let's say z'=a' + i b' is an approximation of z = a + i b. Homework Equations How can I calculate the relative error between two complex numbers z' and z? The Attempt at a Solution...

Hi, I'm using the finite difference method to solve both the Reynolds Equation and the Poisson equation in order to calculate the air pressure of a porous air bearing. The Reynolds equation describes the flow in the channel between the rotor and stator, while the Poisson equation the flow...

Hi, I have to solve a numerical problem namely how air is flowing first through a porous medium followed by streaming of the air coming out of the porous medium in a very narrow channel flowing to the ambient (journal porous air bearing). This problem can be described with the use of two...