I've been getting some experience using Solidworks Simulation with Random Vibration, but I am now faced with an analysis that requires sine on random vibration. How do I enter this kind of information as the excitation in Simulation? Do I need to add spikes that represent the discrete...
We looking to encapsulate our transformers with windings around their E shaped cores. Is there a source that can help us a vacuum chamber that we can use when encapsulating the transformers? Each transformer is about 8 in X 8 in X 6 in in size. Basically when we're done with the encasulant...
I've been working on a random vibration model that has the following:
#Nodes = 37K, #Elements = 17K, DOF=158K
It's a model of a power supply and the problem is that the solution takes DAYS to solve. There are 116 resonant frequences. If I just try to solve the random vibration with just...
We're looking into using a higher grade of 304 stainless steel tubing than the standard grade. My question is about the 1/8 hard, 1/4 hard, etc. grades. They have the desired yeild strength (60-75 ksi) but is the yield strength constant, or consistent throughout the thickness or is the...
One of our customers requires that we perform a test on our product where the externally provided cooling air needs to be metered and measured from 10 CFM to 20 CFM with +/- .5 CFM accuracy. Is there an off-the-shelf type of flowmeter that we could purchase? We will probably need to mount the...
We're looking for an airflow sensor that we can install in our product (power supply). Instead of measuring the rotation of the fan with a Hall-Effect sensor, one of our customers has asked that we consider a sensor that can directly measure the airflow either immediately in front and behind...
I working on a design for an electronics box-type assembly that weighs about 50 lbs. We have vibration isolators mounted at each of the 4 corners. The vibration isolators work well in the vertical direction, but they appear to stiff in the two horizontal directions.
I was told by the...
Currently we are securing ferrite cores used in transformer/inductors assemblies with fixed brackets. The problem is that due to temperature changes the ferrite cores are cracking because of the differences in the coefficient of thermal expansion (CTE) between the ferrite material and the...
I have an engineering colleague who seems to recall that he was taught that the amount of heat removed from a body (lumped mass) varies with delta T as follows:
1. Delta T - for natural convection
2. Delta T^2 - for forced convection
3. Delta T^4 - for radiation
I familiar with 1 and 3...
We're looking for a reliable thermal fuse at around 90C to be used on a printed circuit board. The problem with the fuses we've considered is that they can go off prematurely due to degradation of the fusing material.
Would any one have information on a more reliable type of thermal fuse...
We're looking for a high reliability thermal fuse at about 90 C for use on a printed-circuit board. The problem we seem to be having with the fuses that we're considering is that they can go off prematurely due to degradation of the fuse mechanism (melting or sublimation of fuse elements)
Would...
I'm designing a cover (100 mm dia, 25 mm tall) that will fit over some heated fiber optics that we want to keep at 65 C (-5 C ambient). I'm thinking of making it out of stainless steel (303?) because it has a low enough thermal conductivity and its emissivity is low enough. The electonics...
