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From: isaac2004 on 29 Nov 2006 03:05
hi guys i have been trying to find this information everywhere but i
cant find it. is it possible to list factors of bus preformance and
some details of them. i know its rude to ask for help on homework but i
cant find the information and teacher wont answer my emails. thanks in
advance

From: Brendan on 29 Nov 2006 11:14
Hi,

isaac2004 wrote:
> hi guys i have been trying to find this information everywhere but i
> cant find it. is it possible to list factors of bus preformance and
> some details of them. i know its rude to ask for help on homework but i
> cant find the information and teacher wont answer my emails. thanks in
> advance

>From memory (it's been a while since I've looked into bus design), the
major factors are wind resistance (width and height mostly), fuel type,
engine size, and the total mass of the bus.

Of course this depends on how you define "performance". For fuel
economy, the smallest bus possible is best, but for the efficiently
transporting large numbers of passengers you'd want the longest,
widest, flattest bus (i.e. maximize the number of seats/passengers,
while minimizing the wind resistance). If you're looking at the
performance of the bus in a commercial setting (the profitability of
the bus used in a coach service, for example), then passenger comfort
may be an additional factor (as people aren't going to pay much to be
packed in like sardines for extended periods of time).

Also, there are ways to improve things like fuel efficiency. There was
some research done into using the brakes to slow a bus down by
compressing air. and then using the compressed air to assist in
accelerating the bus later (i.e. converting momentum into compression
and back). For extremely large buses it may also be possible to use
very efficient "fixed revolution" engines with a variable speed
electric drive train (similar to the technology used in diesel/electric
train engines). In general these research projects haven't been widely
accepted due to increased manufacturing and maintenance costs.


Cheers,

Brendan

From: isaac2004 on 29 Nov 2006 11:39

Brendan wrote:
> Hi,
>
> isaac2004 wrote:
> > hi guys i have been trying to find this information everywhere but i
> > cant find it. is it possible to list factors of bus preformance and
> > some details of them. i know its rude to ask for help on homework but i
> > cant find the information and teacher wont answer my emails. thanks in
> > advance
>
> >From memory (it's been a while since I've looked into bus design), the
> major factors are wind resistance (width and height mostly), fuel type,
> engine size, and the total mass of the bus.
>
> Of course this depends on how you define "performance". For fuel
> economy, the smallest bus possible is best, but for the efficiently
> transporting large numbers of passengers you'd want the longest,
> widest, flattest bus (i.e. maximize the number of seats/passengers,
> while minimizing the wind resistance). If you're looking at the
> performance of the bus in a commercial setting (the profitability of
> the bus used in a coach service, for example), then passenger comfort
> may be an additional factor (as people aren't going to pay much to be
> packed in like sardines for extended periods of time).
>
> Also, there are ways to improve things like fuel efficiency. There was
> some research done into using the brakes to slow a bus down by
> compressing air. and then using the compressed air to assist in
> accelerating the bus later (i.e. converting momentum into compression
> and back). For extremely large buses it may also be possible to use
> very efficient "fixed revolution" engines with a variable speed
> electric drive train (similar to the technology used in diesel/electric
> train engines). In general these research projects haven't been widely
> accepted due to increased manufacturing and maintenance costs.
>
>
> Cheers,
>
> Brendan
wrong type of bus but thanks any way i mean bus for comp architecture

From: Peter Dickerson on 29 Nov 2006 12:29
"isaac2004" <isaac_2004(a)yahoo.com> wrote in message
news:1164818370.067906.69550(a)l12g2000cwl.googlegroups.com...
>
> Brendan wrote:
>> Hi,
>>
>> isaac2004 wrote:
>> > hi guys i have been trying to find this information everywhere but i
[...]
>> accepted due to increased manufacturing and maintenance costs.
>>
>>
>> Cheers,
>>
>> Brendan
> wrong type of bus but thanks any way i mean bus for comp architecture

Computer architecture don't have a bus, generally. Computers sometimes do.

Peter


From: donrong on 30 Nov 2006 07:59
This solution is just for fun. I guess. haha

Brendan wrote:
> Hi,
>
> isaac2004 wrote:
> > hi guys i have been trying to find this information everywhere but i
> > cant find it. is it possible to list factors of bus preformance and
> > some details of them. i know its rude to ask for help on homework but i
> > cant find the information and teacher wont answer my emails. thanks in
> > advance
>
> >From memory (it's been a while since I've looked into bus design), the
> major factors are wind resistance (width and height mostly), fuel type,
> engine size, and the total mass of the bus.
>
> Of course this depends on how you define "performance". For fuel
> economy, the smallest bus possible is best, but for the efficiently
> transporting large numbers of passengers you'd want the longest,
> widest, flattest bus (i.e. maximize the number of seats/passengers,
> while minimizing the wind resistance). If you're looking at the
> performance of the bus in a commercial setting (the profitability of
> the bus used in a coach service, for example), then passenger comfort
> may be an additional factor (as people aren't going to pay much to be
> packed in like sardines for extended periods of time).
>
> Also, there are ways to improve things like fuel efficiency. There was
> some research done into using the brakes to slow a bus down by
> compressing air. and then using the compressed air to assist in
> accelerating the bus later (i.e. converting momentum into compression
> and back). For extremely large buses it may also be possible to use
> very efficient "fixed revolution" engines with a variable speed
> electric drive train (similar to the technology used in diesel/electric
> train engines). In general these research projects haven't been widely
> accepted due to increased manufacturing and maintenance costs.
>
>
> Cheers,
>
> Brendan

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