Rocketmotor:
Regarding my reply of 22 Feb 08 please note the following:
The reason it has taken me so long to reply is that unfortunately, I loaned my copy of the Ling Electronics Vibration Training Manual document to a colleague and I am in the process of getting it back. When I obtain it I...
Roctemotor:
I reviewed your post. Good question! I have addressed this random vibration question hundreds of times throughout my 17+ year mechanical engineering career in dynamics and vibration testing. Can we perform this random vibration profile on our shaker? It's a great question, easily...
APPLICATION: Heavy duty trucks make use of king pins and bushings as part of their steering pivot points. The king pins are held in place with tapered threaded draw keys. Basically, the king pins have notches on their sides that allow a tapered draw key to be inserted and pounded in place...
APPLICATION: Automotive (heavy truck); Steering & suspension hardware.
DESCRIPTION: Currently, 2, 7/16-20 threaded drawkeys secure a king pin in a heavy truck axle with standard grade 8 lockwashers and nuts.
IDEA: Replace each standard lockwasher and nut combination with a grade 8...
Thanks so much to TVP and unclesyd - VERY HELPFUL! However, I must admit, I was hopeful the wear questions would pose simple explanations. Wow - I have much to learn in the "material wear world".
Eng-tips come through again. Questions go out - answers come in!
Thanks
Kaiserman
Regards...
APPLICATION: A kingpin and 2 bushings are used on a semi-truck front axle and spindle combination.
Currently, we supply a kingpin that has a higher hardness than the bushing hardness - thus the bushing wears a certain amount for a certain amount of truck useage. By altering the hardnesses of...
Without being insulting, the author fully realizes that the question posed is about as basic as it gets. I need help in selecting great literature/information on carbon steel round bar for an automotive manufacturing application.
QUESTION:
Would someone please suggest the best website and/or...
Phanikumar:
I have been performing modal anlysis on body-in-white automotive structures and other structures for nearly 20 years now. I would like to comment.
Theoretically, as you attempted to point out to your colleague one should obtain the same modal parameters by roving either the accel...
Elogesh:
This thread describes an isuue we face every day in our validation lab. I would like to comment. We have found that virtually all of our problems come down to the boundary conditions of the FEA model. These are tough to duplicate.
As you are finding out, it is extremely difficult...
I have a question in regards to random vibration profiles. What is the equation that vibration controllers use to calculate the maximum displacement of certain random vibration profiles? Displacement calculations are straight forward for sinusoidal vibration, however, displacement calculations...
SBKroske
(1)
As I'm sure you are aware there is no true random vibration equivalent for sine vibration, for multiple-degree of freedom systems. For a single degree of freedom system it is possible to generate equivalency based on a damage or damage potential.
A good article shows how to...
To help improve quality, our company will finally set up a Environmental Stress Screen (ESS) for electronic components. I have been involved with durabiltiy for several years. I am now being asked by our manufacturing management to assist the plant in establishing an ESS involving temperature...
izax1:
I believe they are all the same. I have heard all three terms used interchangeably. Typically, they are used in fatigue analysis or determination. People in our lab typically perform sinusoidal vibration to obtain the first three most prominent resonant frequencies (fn) and...
I am a 38 year old mechanical engineer with 13 years experinece in the automotive industry. For many reasons, I am considering quiting my salaried day time (1st shift) job to home school my children, including a son with a heart defect - during the day.
Since I am not independently wealthy...
Spike:
Wow lots of comments. I too would like to comment as well. By definition, for Sound Pressure Levels, SPL=20log(p/pref) Re 2x10-5 N/m^2. This definition can be stated another way, SPL=10log(p/pref)^2. If we remember that for this last definition, the squared pressure ratio is based on...
