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HelicopterAerial Photography and Video › Who needs vibration/iso mounts?
06-03-2009 05:20 PM  8 years agoPost 41
nooobs

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06-03-2009 08:50 PM  8 years agoPost 42
puneetp

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Somebody posted question regarding operating frequency. I looked up FAQ on Enidine site for wire rope isolator ( not compact )

" 24. Which is better suited for high frequency vibration, an elastomer or Wire Rope Isolator (WRI)?
Elastomers are typically better for high frequency vibration (>500 Hz). Both are well suited for mid frequency isolation (20 to 100 Hz).
"
http://www.enidine.com/Industrial/WireFAQmain.html

Now I have a question.
I am having typical camera loads of 7lb(3.5kg camera)+4lb(2kg mount) for CF34.

Should I go ahead with 4 quantities of
CR3-300 ( max static load 1.2kg )
OR
CR3-400 ( max static load 1.8kg )
OR
CR4-200 ( max static load 1.8kg )

I know noobs tried with CR3-400.

Noobs: you said you talked to Enidine Engineer , which method did you use to access their engineering person, is it available on website , let me know.

Thanks
Puneet

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06-03-2009 09:00 PM  8 years agoPost 43
puneetp

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Also Check out this unique mounting style

One proposition can be to use 16 isolator 4 per contact point. This will also prevent sheer and other unwanted movement which can come by using 1 per contact point , which might be great in compression but might not be enough to hold to the sheer or cause light rolls.

People who use enidine please throw some light.

Disclaimer : screen shot from Enidine catalog for compact wire isolator

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06-03-2009 09:22 PM  8 years agoPost 44
nooobs

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06-04-2009 07:13 AM  8 years agoPost 45
borneobear

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One issue I didn't like about the Enidine wire rope isolators is the weight. Seems like a bit over-engineered for me.
IMHO, keeping things simple and weight *less* is a golden rule.

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06-04-2009 07:28 AM  8 years agoPost 46
nooobs

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06-04-2009 07:50 AM  8 years agoPost 47
borneobear

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I meant ourselves as the over-engineers.

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06-04-2009 08:11 AM  8 years agoPost 48
jhamlinjr

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Not to change the subject but how did you come out with your gel borneobear?

HALO

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06-04-2009 09:19 AM  8 years agoPost 49
borneobear

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When this topic was brought up months ago, I was also looking for vibration isolators.
The Enidine option was certain at the top of the list.
However, the weight and mounting method didn't fulfill the golden rule.

This led to my current compound, which isn't 100% gel based, though a fully gel based isolator was tried (failed).

An Isolator design should incorporate the following:

1. Minimum weight (inclusive mount)
2. Isolation at 30 Hz and below
3. Minimum height (to reduce pendulum effect)
4. Easily replaced (if required) based on weight loading
5. Minimum / zero mechanical movement required to achieve vib isolation
6. Must 'float' the entire camera mount structure, therefore preventing vibration transfer (hence 'isolator'

An example:
Use 16 isolators, 4 per contact point. This will also prevent sheer and other unwanted movement which can come by using 1 per contact point , which might ... cause light rolls.
Using 16 isolators (!) would compound the weight problem, and a host of other issues like placement, size and height. To prevent light rolls and sheer, using a well balanced mount may well overcome the issue without overly complicating the entire design.

Hope that wasn't too much out of topic.

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06-04-2009 12:29 PM  8 years agoPost 50
puneetp

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borneobear: I think your point is very much within the topic. valid as far complication is concerned but if results are great who hates it.

papatango had put a Mitchel mount where wire rope isolators are used ( not Compact wire rope isolators) they had put 8. I heard him also say that many small seems to be choice than four big one.

nooobs : Can you throw some light on Cf3-400 behavior , how much does it get compressed once you put the mount on in % ?. My guess is your weight is approx 2.5kg with mount. I might have little more weight requirement, so i am considering cr3-300.

I want the mount to be as stiff to the helicopter as possible with average level of isolation. To much floating will produce that wobble or pendulum affect which we all want to get away from. some inputs please ?

I did manage to get in touch with sales rep from enidine(New York) and he suggested CR5-400 for my weight requirement of 5.5Kg.

Charts are below Foot Pound System and in Metric System

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06-04-2009 12:38 PM  8 years agoPost 51
puneetp

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Here is Mitchel Mount dampers earlier posted in nooobs thread.

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06-04-2009 01:38 PM  8 years agoPost 52
wjw

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I am using 4 Enidine CR3-400 on my mount. I currently have it set up in a tension mode, not compression.
It is a nice improvement over the single Lord Mount that I had before. I have also tried the CR3 200 but found them to be too compact and "tight" to handle the higher freq. vibs
When I get some free time I will convert the mount to compression to see if it works better, it was just easier to set it up this way first.
Total weight on the camera mount is about 2 1/2 lbs.
I am also thinking of using a combination of Enidine and Lord Mounts so as not to depend on one design to cover all vibrations.

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06-05-2009 08:19 PM  8 years agoPost 53
puneetp

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I got to talk to the design engineer of enidine through the sales rep , he forwarded my question.

I put the weight repquriment of 4-7kgs having 4 contact points.

The design engineer of enidine suggested me CR6-100 for 4-7kgs
of load.

Also I got to know that they don't stock the product . Its built to order

I just noticed that each is 2KG. That's shocking I don't think this thing fits my requirement.

wjw: What deflection numbers did have in mind for your condition ( in inches ) and the load ,before ordering ?
Noobs : please can you also answer that ?

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06-05-2009 09:40 PM  8 years agoPost 54
nooobs

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06-05-2009 09:47 PM  8 years agoPost 55
puneetp

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Rosauro, thanks for reply, did you have any deflection numbers.

The engineer their is asking me for more details ?

I don't have a vibration messuring unit to give amplitude and frequency numbers to them ? I gave approximation of 20-60Hz

How are you planning to interact with them ?

They talked about natural frequency , for a weight. I don't have these numbers

Do I need to buy a vibro-meter ( lowest cost one ebay is like 450USD) ?

Sure, your IMU updates on your website are very interesting.

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06-05-2009 10:03 PM  8 years agoPost 56
nooobs

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06-05-2009 10:19 PM  8 years agoPost 57
puneetp

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Thanks Rosauro, I know I have been exchanging numerous mails with them. I am interacting both with sales rep and the design guy.

I told them I want the mount to be stiff and not wobble/sway/float. So they asked me to quantify . I did not have these numbers.

Also since weight requirement was varying they isolator had varying natural frequency response on different weight. Like you said.

Btw : My installation is similar to yours.

Is that compression or compression/roll ?

I did put them another mail specifying natural frequency , weight , number of contact points.

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06-05-2009 10:33 PM  8 years agoPost 58
nooobs

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06-05-2009 10:39 PM  8 years agoPost 59
puneetp

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I know many advice to keep camera mounted hard on the helicopter, are you planning to go that way ?

I am quite intrigued by the 4 per point, mounting type.

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06-05-2009 10:53 PM  8 years agoPost 60
nooobs

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HelicopterAerial Photography and Video › Who needs vibration/iso mounts?
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