mdm
Member Since: 25 Mar 2008
Location: Rossendale
Posts: 21
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can anybody on here tell me what the swinging weights do behind the rear bumper ?
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 4th Apr 2008 12:58 pm |
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NoDo$h
Member Since: 02 May 2006
Location: Finding new and exciting ways to milk badgers.
Posts: 19689
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harmonic dampers, they help contribute to the smooth ride. Try blocking one or both and going for a drive and you'll feel every pothole shudder (and feel sick into the bargain) I know it's not considered "kind" to say no these days, but no. Just no, ok? And if it's not ok, still no.
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| 4th Apr 2008 1:15 pm |
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mdm
Member Since: 25 Mar 2008
Location: Rossendale
Posts: 21
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thanks for that i will give it a go. it seems a simple if somewhat poor solution to a problem most other vehicle manufacturers solve without adding large lumps of metal to a heavy vehicle in the 1st place
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| 4th Apr 2008 4:36 pm |
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Bodsy
Site Sponsor
Member Since: 06 Nov 2006
Location: In the Clubhouse
Posts: 21361
 
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Do a search for Harmonic Dampers in google & you'll be suprised to find what else they're used for (anti-earthquake in buildings for one thing. A good engineering solution I think yoiu'll find. Do they get in your way or otherwise affect how the car looks? Bodsys Brake Bible
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| 4th Apr 2008 4:41 pm |
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PaulP
Member Since: 04 May 2007
Location: Barcelona
Posts: 4317
 
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mdm wrote:thanks for that i will give it a go. it seems a simple if somewhat poor solution to a problem most other vehicle manufacturers solve without adding large lumps of metal to a heavy vehicle in the 1st place
Ermmm....not quite 
Looking at it from another point of view is that engineering harmonic weights into the design of a vehicle is an effective and forward-thinking solution to ride quality problems that most other vehicle manufacturers simply do not bother to solve....
Instead they rely on damper/spring combinations as a best-fit trade-off. I think you'll find that the pneumatic suspension and harmonic dampers fitted to the D3/RRS etc provide what is probably one of the best ride qualities in ANY mainstream production car on the road today...especially ones that are designed with fully independant suspension and high levels of articulation as yours is.
I think you can rest assured that after spending so much money on the design of the D3, LR didn't just think "ahh f  k it....another 80kg won't do any harm...stick some big swingy weights on and it'll save us a few hours work  "
Sorry if this sounds slightly sarcastic (I hope not), but you need to really start investigating the lengths that LR have gone to in designing this car before you criticise it with such throw-away comments  2006 Discovery 3 TDV6 SE Auto Buckingham Blue
2007 Golf GT DSG
Last edited by PaulP on 4th Apr 2008 5:49 pm. Edited 1 time in total
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| 4th Apr 2008 5:18 pm |
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simon
Member Since: 11 Jan 2005
Location: Shropshire
Posts: 18296
 
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Are the weights actually connected to an sensors ?
They appear to be just free swinging - so at odds as to how they actually work.
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| 4th Apr 2008 5:22 pm |
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Bodsy
Site Sponsor
Member Since: 06 Nov 2006
Location: In the Clubhouse
Posts: 21361
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They work just by their free weight & the chains they're on. no sensors needed, just physics...... Bodsys Brake Bible
D4/D3 Remote FBH heat kits
BAS Remaps/ EGR Blank
Transmission Flush
Software updates/enabling
Clock/ SNOTM /3Flash / 4x4Info /BT Update /Service Reset/Error Codes / Gearbox Reset
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| 4th Apr 2008 5:26 pm |
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mdm
Member Since: 25 Mar 2008
Location: Rossendale
Posts: 21
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thanks for the replies. i am well aware of the use of harmonic dampers in engines and some other applications.
please note i did not say they were in the way or affected the vehicle's looks ,merely that no other mainstream vehicle has them and fee lfree to correct me if you know of some. i was merely comparing what is a simple low tech solution to the amount of hi tech gizmos that are in most modern vehicles.
i did ask the service team at stratsone and guy salmon and i think you can guess the answer.4 people inc service manager did not have a clue what they were or the benifits of said item.im still waiting for both of them to report back to me what the tecnical help desk says.
i will remove them and report back if there is a noticble deterioaration in ride quality.
in simple terms though the less weight in a vehicle the easier it is to control the body and chassis response to our crumbling road system
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| 5th Apr 2008 10:46 am |
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ianv
Member Since: 20 Dec 2007
Location: Bungendore, New South Wales
Posts: 338
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People,
These balancers actually have quite a heritage, go and have a look under the landrovers of days gone by and you will find them quietly poised at the back end of the chassis for the 1950's on. I believe that the harmonic balance contribution is also very important in preventing chassis cracks.
Any other on line with more historical engineering knowledge?
rgds
Ianv TDV6
Last edited by ianv on 5th Apr 2008 11:12 am. Edited 1 time in total
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| 5th Apr 2008 11:04 am |
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1955diesel
Member Since: 08 Mar 2005
Location: Birmingham England
Posts: 31
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They are built into the ends of the bumpers on some cars and nearly all use a tuned steering wheel weight to stop vibrations at idle.
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| 5th Apr 2008 11:11 am |
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Getafix
Member Since: 13 Sep 2007
Location: Melbourne
Posts: 229
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Quote:i will remove them
MDM, tell me you're taking the pi*s, please. <*(((<<
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| 5th Apr 2008 1:58 pm |
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simon
Member Since: 11 Jan 2005
Location: Shropshire
Posts: 18296
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Bodsy wrote:They work just by their free weight & the chains they're on. no sensors needed, just physics......
Yes but how to they work ?
If a weight is swinging at the back of the chassis.. what possible effect can they have on a vehicle that weighs so much ?
Just interested to know how they do their thing and why ?
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| 5th Apr 2008 2:05 pm |
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Dom Harvey
Lord of the Four Fingers
Member Since: 15 Apr 2005
Location: Dorset
Posts: 7454
 
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I suppose there's a human comparison to be made here  2004 Discovery 3 - gone
2006 Discovery 3 - gone
2008 Discovery 3 GS - gone
2011 Freelander LE Special Edition - gone
2007 Discovery 3 XS - gone
2012 Discovery 4 GS - current
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| 5th Apr 2008 2:25 pm |
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1955diesel
Member Since: 08 Mar 2005
Location: Birmingham England
Posts: 31
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simon wrote:
Yes but how to they work ?
The section in Wikipedia gives a reasonable explanation. http://en.wikipedia.org/wiki/Tuned_mass_damper
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| 5th Apr 2008 2:40 pm |
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DG
Site Moderator
Member Since: 12 Dec 2005
Location: The Gaff
Posts: 50934
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mdm wrote:
i will remove them and report back if there is a noticble deterioaration in ride quality.
WTF 21 year LR veteran > D2 GS 2003 > D3 S 2006 > D3 HSE 2009 > D4 HSE 2013 > D4 HSE 2015 > D5 HSE 2018 > DS HSE R-Dynamic P300e 2021
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| 5th Apr 2008 2:51 pm |
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