Recent content by KalleH

I was probably the one who posted the link to the Volvo standards. However, 5.3 is just about torque/tension relationships.

That is easy to say if you are not in the heavy vehicle business, where this is standard on chassis, to which brackets are bolted.

Volvo corporate standard 5511,21, which can be found on the following adress has excellent tables to determine clamping force / torque relationships depending on thread and base friction. Please, see the adress below: http://www.tech.volvo.se/standard/eng/

Does anyone have a reference for the relaxation of screw joints in micrometer as function of aspects such as surface roughness and paint type and paint thickness? Thanks!

Assume that I have a board like structure lying down and suspended in its four corners. I have measured or calculated the accelerance (a/F) between a point A of the board and the base. I now introduce four isolators between the base and the four corners of the board. My question: Is there an...

Samer, I have constructed the following subroutine, which I have checked using handbook methods and LMS tekware. (I will however not guarantee its accuracy.) Public Sub FromToRainFlow() 'Counts cycles according to the rain flow algorithm. 'Precondition: dPeaks[] 'Postcondition: dFromToRain[]...

Never mind. In the case of the flextest system, I acquired the signals through the auxiliary channels. Apparently, these are not low pass filtered to prevent aliasing. Hence, my conclusion is that the frequencies around 80Hz are simply the ones around 500Hz aliased. Sorry! /Karl

When using a 3DOF servohydraulic shaker, I have lately encountered some odd harmonics in my 3DOF response signal. The frequency content of the non-stationary noise that I try to simulate is 5-35 Hz. When measuring using a MTS flextest system, the parasitic harmonics end up at around 80Hz. All...

Thomas, Thank you for providing the command for calling on the batchfile. It is actually a friend of mine who asked me this question for a joint project, so I won't be able to get to much into the details. However, what he wants to do is to write the actual batch file. I.e. he would like to...

Hi everyone! Does anyone have a web reference to a guide for writing batch files for solving in Nastran? Cheers!

10031978, Not really. I have myself never had to write one with this purpose. However, the APDL programmer's guide in the Ansys documentation quickly gives you all the information you need to write this kind of an APDL loop. A word of caution: APDL will work well for small models like yours...

To me, the most straightforward approach, seems to be to make a small APDL loop that determines and applies the right nodal temperatures. This based on interpolation from the eight nodal temperatures that you have. Cheers!

CaptainCrunch, I guess that the simplest way for you to determine if your doing things right would be to intrument a specimen with strain gauges in the most critical points and obtain both strain and acceleration when you do your DAQ in the field. Then see if the same points will see the same...

I agree with Dampit. Dirlik-Bishops method is the most appropriate one for non-narrow bandwidth noise that can be characterized as stationary random. It will give you a nice range-no mean histogram, which you can use to calculate damage. HalfPenny @ nCode has written a nice indroduction to the...

Tom, I guess the approach you describe is the way to go for a linear system, where I can use mode superposition. However, in this case I have non-linear springs, and hence the modes at lower amplitude will not give me all the information I need for the analysis. Hence I solve the problem in...