what about doing something like this, for a half sine:
A = - 9.8e6 ! amplitude
xtime=.0001 ! seconds
ttime=.0001*3
asize=75 ! data resolution
pi=3.141592654
*dim,xdata,table,asize,1,1,time
xdata(1)=0.0
xdata(1,0)=0.0
*afun,rad
*do,i,2,asize
xfr=pi*(i/asize)...
I have a PCB that I'm modeling, and am trying different ways to see which modeling technique give the most accurate solution. The PCB is undergoing a transient out of plane deflection (imposed through the ACEL command and an experimentally determined shock input). When I use SOLID185 or SHELL...
I have a chip that has 1/4 symmetry, but the chip does not lie in the center of the board. I need to move it to its actual position. In the future I'm going to need the quarter symmetry model, so I thought it would be easier to model it and then expand it to the real full model.
I use NUMMRG...
The active coordinate system is properly set. I changed the order of the expansion (X then Y, or Y then X) and I have problems during the second expansion each time.
I modeled it this way:
1)Create the a single solder ball, including the package directly above it and the board directly below...
I created a 1/4 symmetric model of a PCB package that I want to expand to a full model (to place onto a board). When I expand the geometry using VSYMM, I get the following error message "Line XXXX has inconsistent spacing ratio with line YYYY". One line is the symmetric reflection of the other...
Can anyone advise me, or point me to a resource that can help me with the following problem.
I'd like to analyze the fluid-structural problem for a clamped-clamped beam being subjected to an inertial half-sine acceleration using the ACEL command (like what would occur if the system is drop...
Can anyone point me in the right direction for the following problem:
I'd like to model a clamped-clamped beam with fluid between the beam and a fixed wall. As the beam is deflected (with a transient inertial acceleration), the fluid (air) is compressed and squeezed out from beneath the gap...
It's just been taking a long time to subtract all the small areas from the large one (there are a lot of perforations in the device). I think I should just accept that fact.
Does anyone have any advice on meshing the model? The holes (square) are 25 x 25 micrometers, seperated by 35...
Yesterday I modeled a MEMS device with perforations by first creating the area of the device and subtracting the areas of the perforations. Today whenever I run it (by copying/pasting txt into the command line) the program become unresponsive and I have to force the program to quit.
Does anyone...
I'm running a squeeze film analysis to determine the damping parameters (ALPHAD & BETAD) for a clamped-clamped, non-perforated beam with Pressure = 0 BC at the open sides only (no specified pressure BC for the FLUID136 elements on the fixed sides). I have been following the example in Chapter 16...
Ok, for (1), I am mistaken. Body acceleration is what I meant.
For (2), I was trying to find the pull-in voltage for a given shock input. My original intention was to automate this process by running a transient analysis multiple times with a *do loop. Every time the *do loop runs, the voltage...
I'm applying both a (1) electric shock (stepped voltage) and (2) base acceleration (ACEL). The base acceleration is a half sine pulse, which does not vary in duration and magnitude.
The *do loop that I am running increases the magnitude of the voltage every loop of a transient analysis. The...
I'm running an analysis in ANSYS to determine when pull-in occurs when a parallel plate capacitor is subjected to a voltage and a mechanical shock. When pull in occurs, ANSYS says that the solution does not converge. I am keeping the shock constant and running transient analyses at increasing...
I am currently modeling a MEMS parallel plate capacitor and am investigating the interactions between an applied voltage and a mechanical shock to the response (specifically displacement and the "pull-in" phenomenon). The gap is represented by TRANS126 elements. I have been able to get a static...
