Folks,
I have been designing elastomer mountinga, and vibration control for some time, and there is a purpose designed calculation tool, free to use, which will help you out.
ISOMAG 2 is designed to carry out rigid body analysis of rubber mounted systems, and was originally developed through a...
Josh
I have attached a little sketch from 'Engineering Design With Natural Rubber' which explains the calculation of shape factor.
From your post it seems that you are dealing with a multi-layer (interleaved) spring.
These are essentially a set of springs in series, so the shape factor is...
Parsnip,
I design/specify industrial rubber vibration control components, and and look after the UK market for a large German company. So if you're looking at rubber isolators I can offer some advice.
If you go to :
http://intl.simrit.de/web/public/products/technicalmanual
and go to the...
Parsnip,
I would suggest the following initial approach.
The key factor is the ratio between the forcing (disturbing) frequency, and the natural frequency of the system along a particular axis.
A natural frequency 2x the forcing frequency will give a transmissibility of about 0.35 (65%...
On dynamically loaded parts, we tend to use ' loss angle' as a measure of internal damping (hysteresis).
Loss angle is defined as the phase lag between the applied load and the transmitted load through a rubber component, and is to a certain extent, dependent on dynamic amplitude and frequency...
Thanks to all, for your comments and suggestions so far.
On the subject of pointing devices, I have been using a vertical AirO2obic or Quill mouse, which you hand sits in, in neutral 'handshake' position. My employers bought me this about a year ago, and although not cheap at £60 ( or about...
At the age of 40, I find myself in a potentially career limiting situation.
After 12 years or so CAD / and computer use, I have been diagnosed with osteo arthritis in my right hand, which is firstly painful, and secondly starting to restrict movement.
In the short term, my employers are being...
As a confirmed photo nut, it seems like an awful lot of trouble to go to to silence a inherently noisy type of camera, whilst at the same making it pretty difficult to handle.
The main source of noise will be the reflex mirror, as there will be no film transport in a DSLR camera, so if your...
Mike,
Barry controls have a range of aerospace instrument mounts, which use a steel spring in conjunction with a rubber air damping system, to control the resonant amplitude.
These are designed specifically as aerospace mounts for instrumentation/electronics, so you should at least take a look...
To narrow it down a bit, can you give an estimate of the suspended mass, the disturbing frequncies, and the required level of isolation? Operating and environmental conditions would also be useful
I work in industrial vibration control, and with the above information, I can probably point you in...
Hello Gents,
Having read this thread, I am wondering whether a viscous damper is required at all.
To summarise, you have a large machine weighing several tonnes, producing low amplitude vibration in the range 30-80Hz, and you wish to damp or isolate this vibration. Freedom to move in a lateral...
Steve,
In addition to the references mentioned earlier, I have come across another title which might be of interest:
Engineering with rubber, How to design rubber components, published by Hanser Gardner ($99). If you go to www.hansergardner.com , go to browse categories and then rubber, you...
Steve,
Whoops - just re read my last post!
I should have said that the height should be less than the diameter, for stable compression parts.
Sorry, must have been Friday brain fade.
I'm glad you tracked down a copy of Gobel so easily - it took me about 18 months! Just check it's the English...
Steve,
The source of the modulus data is a small 40 page book " Engineering Design with Natural Rubber" by P.B Lindley. The updated version is still in print and is published by the MRPRA ( Malaysian Rubber Producers Association) in the UK. The web address is : http://www.tarrc.co.uk/. I can...
Steve,
From what you describe, this sounds like quite a strange rubber spring, especially as you are using diaphragms to prevent the rubber cylinder from buckling. This height/diameter ratio is really not best suited for use as a compresseion type spring.
If you are looking for high deflection...
