hydraulic engine mount design

[Cornel18]

Hi,

I would like to know if it is practical to attempt the design of an engine mount that can cover a frequency range between 1 and 300Hz. The theory/modeling suggests that it is possible. However, I am not sure how would that work in a practical case. How would one change the dynamic stiffness (and potentially the notch freq) over such a large freq range.

I would really appreciate any feedback on this topic.

Thank you,

Cornel

 

[GregLocock]

I think it might be possible, I doubt it is feasible.

The least of your worries is not being able to change the dynamic stiffness over that frequency range.

Have you got some test data over that sort of frequency range?



Cheers

Greg Locock

SIGlease see FAQ731-376 for tips on how to make the best use of Eng-Tips.

 

[Cornel18]

Greg,

Thank you for your feedback.

The testing is one big problem, indeed. With the shaker we have we could run tests up to 120Hz. What happens after that is a total unknown for me.

My main concern is that the model I built for this mount (a linear model so far) predicts a somehow acceptable response over the entire range of freq by changing several parameters in the model, as I sweep the freq. However, I do not see how those parameters (specifically rubber compliance) can be changed in real time.

I noticed that in one of your past postings you refered to a hydraulic mount model with about 50 parameters. Do you have a reference I could consult on that?


Thank you,

Cornel

 

[GregLocock]

Well, you knew the answer before you asked, it is proprietary.

SAE 2005-01-1065 might be a good place to start, but they only go to 50 hz, and 2002-08-0301 may be relevant



Cheers

Greg Locock

SIGlease see FAQ731-376 for tips on how to make the best use of Eng-Tips.

 

[Cornel18]

Is this call number correct 2002-08-0301? I couldn't find it on SAE's website.

Thx

 

[GregLocock]

aka JSAE Technical Paper No. 20025303

Cheers

Greg Locock

SIGlease see FAQ731-376 for tips on how to make the best use of Eng-Tips.

 

[Cornel18]

I cannot find this paper even with the new call number. Do you have a title for it?

Thank you,

Cornel

 

[GregLocock]

http://www.bookpark.ne.jp/cm/jsae/select_e.asp?pageno=51&pagenum=10&category=103&lang=E&table=JSAQ

Cheers

Greg Locock

SIGlease see FAQ731-376 for tips on how to make the best use of Eng-Tips.