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Thanks for the posts. So, I have 2 sets of vibration data collected over a set time and there are a number of frequency components that stand out. I want to compare the 2 sets to determine in which case the vibration is worse. Will the RMS of acceleration give me this? Is it correct to say...

What is the physical significance of the RMS of acceleration data. I have read that it is a measure of energy. What would the units be? Is there an integral function to describe this? Can anyone expand on this a little? Thanks in advance

Thanks for the help.

I am looking for a general relationship between the thickness of an exhaust tube and the amount of vibration and sound. Does anyone know where I can find equations relating these. Will other factors (length of tube exhaust pulse frequency and amplitude) effect vibration/sound in a way that...

Yes, Thanks for all the help. Very helpful. Sorry about the delay in response, I was gone for a few days. EngForm78

I have a problem with a suspension system were the center of gravity is not at the geometric center. So, under static load each spring is loaded differently. I would like to find the deflection at each spring. To analyze the problem I set up a very stiff plate and put a spring element at each...

Yes, I did mention force because I was thinking in terms of the final answer to my problem. I should be for general- Sorry. I have looked through the Parker handbook and do not see a torque estimation equation based on %compression. What section did you see this? I understand how compression...

I am trying to determine the friction created by an O-ring seal in an ocillating application. The application is like that of a facet handle where motion is limited to about 90 degrees. The result will be the force required to turn the valve handle. I have found equations for fiction in...

I have an aluminum bending process involving complex extrusion shapes. Currently we use small steel shot to fill the tube before bending to keep it from collapsing. However, some of the extrusions are large and get very heavy when filled with steel. Are there other types of materials or methods...

I am working on a problem concerning the compression yield of plastics due to expansion from heating. Does anyone has thoughts or information on the response of plastics in this type of case? Here is brief description of the problem: If I were to constrain a bar at room temp so that it could...

This question is in regards to designing a component that will not frost from being outside. Thanks for the responses

Why does frost form on metals easier than other materials like plastic. Is there a stronger chemical bond between the metal and water? Does the specific heat have an effect? Thanks

Is there a way to predict the material properties after cold working or is it all experimental?

How does everyone analyze a problem where cold forming has changed the material properties in certain areas. Example: Geometry: A simple "L" bracket cold bent from flat steel. Loads: Turn 45 lke a "V" and pull apart like <- V -> Properties: ???, The material propties will be different...

You could try the NAFEMS.org web site. They have alot of info and resources. EngForm78

Eric Could you please explain the second part of 3) "That is why and aerospace industry, they need nonlinear analysis." Thanks

I am posting these thoughts and questions in regard to Von Mises failure criteria and comparing it to experimetnal results. I am curious as to how everyone verifies models against experimental data. With respect to Von Mises(VM)stress criteria the books define failure as a stress above the...

I have a situation where I am looking for a job while I have a job and i have not told my employer. I have MS and I really like my job, although my pay is low, but I only have a little over year experience(besides co-ops). I would stay except circumstances requrie that I relocate eventually...

I am working on a plastics problem where there are a variety of formulations with a varitety of strength properties. I can see that when the material Modulus of Elasticity, E increases the yield strength does as well, and vice versa. Is there a real realationship here? If I get a range of E...

WHat are the common materials for heating elements. WHat are the main factors, I would guess resistance and melting temp, but I am not sure.