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The antennas are more or less universal -- each truck gets several antennas, but each antenna is also used on a myriad of different trucks, and often times in different locations on the same truck. What I am trying to do is validate our brackets, just to ensure that they will not yield during...

The input will not be applied by a shaker table (though I wish it would be). Also, we plan on running two 2-axis accelerometers to capture all three directions. There are two ways that we are considering running the tests: One possibility is to suspend the antenna (possibly using monofilament...

Thinking more about it, I think it may not be possible to determine modal participation with a single accelerometer. I would think that the magnitude of each frequency would depend greatly on location of the accelerometer with relation to that particular mode shape. A less dominant mode may...

First, a little intro -- I design metal brackets that bolt to trucks that hold various types of equipment, all furnished by a third party. We perform structural simulation (FEA) on all of our brackets, but we don't have much information on the equipment that our brackets hold. We currently...

I do have a non-linear solver than I can use, however it won't allow me to use my input PSD curves to analyze random vibration response. I'm thinking the best method may be to accoustically measure the dominant natural frequency, then maybe create a spring-mass system to represent the antenna...

I'm not trying to eliminate the motion, I'm trying to recreate the scenario using FEA tools. I would like to generate a similar scenario to use in my analysis of the antenna mounting bracket.

Hello all, I am running across a problem trying to analyze reactions in antenna brackets used to support whip antennas. The primary concern is our random vibration analysis. Many of the antennas have a spring base that keeps the antenna fairly "rigid" most of the time. However, when the...

Many of you seem to have a lot of experience in this field, so hopefully you guys can make this a little clearer for me. I have been asked to reduce the "vibration" of a camera mount (not vague at all, yeah) using random vibration FEA studies. I have been analyzing the displacement, since I'm...

Disregard -- sorry, I put this in the wrong forum.

I have been analysing a relatively simple assembly made up of two solid bodies and a sheet metal body -- it's a sheet metal bracket bolted to a truck that holds two copmonents (both are bolted to a vertical face). The error message that I'm getting comes when I try to copy my frequency study to...

I have been analysing a relatively simple assembly made up of two solid bodies and a sheet metal body -- it's a sheet metal bracket bolted to a truck that holds two copmonents (both are bolted to a vertical face). The error message that I'm getting comes when I try to copy my frequency study to...

Anyone heard of this? http://www.angellabsllc.com/index.html I didn't have a whole lot of time to look over it because I had an 8am test, but it seems interesting. I don't think they have done any actual testing where they ignite a fuel/air mixture, but they have done what they call "air...

So, I guess the consensus is that on a turbocharged car, a small step, maybe 1mm all the way around, is needed to account for alignment. On a N/A car, would a larger step be more effective? What about 1mm on the top, and larger on the floor?

Hrm...I wonder how different the Swain coatings are from the Techline stuff I use. I know that they are applied much thicker, but it can't be a *whole* lot thicker before it starts affecting combustion area and quench and stuff.

He had a thermocouple mounted on the underside of the piston, but I agree that the test wasn't carried out well. Would polishing provide more of a benefit than a thin layer of ceramic coating, or do you guys think ceramic coating is still the best option?

I apply the coatings as well -- we buy coatings from a company called techline. I have a link to a thread where someone heated up the faces of three pistons, coated, uncoated, and polished with a torch from an inch away for a given amount of time. It's a poor experiment, and not exact by any...

Sorry I wasn't more specific -- it's a gasoline application. I coated the pistons, combustion chambers, and valve faces in my previous engine, but really have nothing to measure it against. I'm about to build a new engine and am trying to decide what to do.

I know the effeciveness of ceramic coating is kind of a controversial issue, but I was wondering what you guys thought. I understand how polishing helps by minimizing surface area, but does it really "reflect" heat? What are the advantages of each in the combustion chamber of the head and the...

The engine is a 2.3L Quad4 with custom ground Engle cams. I don't remember the exact cam specs (the spec sheet is in Charleston and I'm at school in Clemson), but there's about 4* of overlap at .050" if I remember correctly. I can't change the cams, but I might be able to change lobe centers...

Hey all -- I've been a long time lurker, but just now am getting around to my first post. Great info on this site! Anyway, I know it's common practice to keep the step between the exhaust port and the header, but how important is it on a turbocharged vehicle? Should there be any steps to...