BMW=Members Only jackets, Regan-omics, Studio 54, and coke spoons not high tech cars!
07-07-2002, 02:16 PM
#21
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Damn, dude. Did you post this on EVERY forum.
A4 forum members: For more enjoyable reading, you will find more of the same on the '02 forum. This guy's been gunnin' for me since this morning. <img src="http://www.bimmerfest.com/forums/images/smilies/jpshakehead.gif"> <img src="http://www.bimmerfest.com/forums/images/smilies/plthumbsdown.gif">
07-07-2002, 02:46 PM
#22
OK cool that's what I thought...I'm getting a bit rusty
on some of the mechanical stuff...I quit my job at Harman about 2 years ago, so I haven't done any electroacoustical stuff for that whole period other than my own stuff which is for fun and tends not to get as involved as the cost constrained stuff I worked on at Harman...there's a lot more analysis when you're watching the $$$.
Anyhow yeah you can model just about anything with lumped RLC from the mechanical world I would think, but the move from mechanical system to electrical analogs can be very tedious and requires a healthy grasp of physics if you want to define a topology which isn't already done by someone in some book for you, sometimes small changes are easy to tack on...sometimes not it just depends.
Here's a picture just in case you're curious of what this sort of thing looks like. I used the vented or, "bass reflex" box which everyone is familiar with as an example. These are pages taken from Dr. W. Marshall Leach, Jr.'s book Introduction to Electroacoustics and Audio Amplifier Design. The book is in fact a cleaned up version of the course notes he uses to teach a course on loudspeakers and audio amplifiers to EE majors at Georgia Tech, he has also held the presidents chair of the AES (Audio Engineering Society). Anyhow...you can get the book from Amazon or some such...no need to actually take his class ;-) It starts out with an introduction to particle motion (air) and in that chapter many of the basic ideas about radiation impedance and loading effects are setup which lead to further equations which begin to describe the interaction of idea flat pistons radiating into various spaces in various configurations resulting in numerous equations which can be used to evolve the mechanical / electrical analogs.
Follow the link if you'd like to look at the pages I shot for you...
http://www.pbase.com/image/2951408
http://www.pbase.com/image/2951410
http://www.pbase.com/image/2951414
Regards,
Anyhow yeah you can model just about anything with lumped RLC from the mechanical world I would think, but the move from mechanical system to electrical analogs can be very tedious and requires a healthy grasp of physics if you want to define a topology which isn't already done by someone in some book for you, sometimes small changes are easy to tack on...sometimes not it just depends.
Here's a picture just in case you're curious of what this sort of thing looks like. I used the vented or, "bass reflex" box which everyone is familiar with as an example. These are pages taken from Dr. W. Marshall Leach, Jr.'s book Introduction to Electroacoustics and Audio Amplifier Design. The book is in fact a cleaned up version of the course notes he uses to teach a course on loudspeakers and audio amplifiers to EE majors at Georgia Tech, he has also held the presidents chair of the AES (Audio Engineering Society). Anyhow...you can get the book from Amazon or some such...no need to actually take his class ;-) It starts out with an introduction to particle motion (air) and in that chapter many of the basic ideas about radiation impedance and loading effects are setup which lead to further equations which begin to describe the interaction of idea flat pistons radiating into various spaces in various configurations resulting in numerous equations which can be used to evolve the mechanical / electrical analogs.
Follow the link if you'd like to look at the pages I shot for you...
http://www.pbase.com/image/2951408
http://www.pbase.com/image/2951410
http://www.pbase.com/image/2951414
Regards,
07-07-2002, 03:23 PM
#24
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Yeah, that was earlier this morning...
...that's the crap I was referring to on the '02 forum. <img src="http://www.bimmerfest.com/forums/images/smilies/jpshakehead.gif">
See my responses.
See my responses.
07-11-2002, 09:56 AM
#29
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Dude, honestly....you REALLY need to Chill. My family has both BMWs and Audis and GUESS WHAT.......
THEY ARE BOTH EXCELLENT, WONDERFUL CARS! Your hysteria in which you go about bashing BMW just makes you look even more incompetent. I know you just wanted to share your love of Audi with the rest of us, but the manner in which you approached it by bashing BMW and saying its crap makes your opinion basically worthless. If you had a different approach, perhaps it would be different. Oh, BTW, BMW has had multi-valve heads since its inception. Show me a 4 stroke head with only one valve per cylinder ;D
