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• # Optimal angle for weight to be applied to a shock

Discussion in 'Calculations' started by Barbarian, Dec 9, 2013.

1. ### BarbarianActive Member

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Sep 2013
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I have a small shock that needs to support few hundred pounds. The designer who came up with it made a major flaw in part design so the pressure on the shock is too shallow instead of weight applying from point to point most of the pressure goes right in the middle of the shock causing it to bend and making it useless. My question is how do i calculate the correct angle for the shock to work properly? Im industrial Designer. I cant post picture now but will post when I can.

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3. ### LochnagarWell-Known Member

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Feb 2011
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There are a few iterations here to solve the problem - since usually there are geometry constraints that dictate where the gas strut can be fitted - versus what size of gas strut you can buy - versus the closed / and open angle of the system.

So to start the iteration process:

1) The first thing you need to do is draw a free body diagram of the problem - with all the forces acting on it. From this you should be able to compute the gas strut force required in the both the closed angle and open angle of the system.
(I sense from the picture you have posted above - that it is maybe upside down - since gravity would want to hold the horizontal member down - not up).

2) The second thing you need to do is pick a gas strut of sufficient capacity to do the job - from the results you get from step 1 above. However, it is likely that the gas strut will not fit into the exact locations you envisaged in step 1 above. Therefore you need to find a gas strut that will "do the geometry".

3) The third thing you need to do is ensure that the gas strut is capable of holding the horizontal member in your diagram - when your horizontal member is in the open position - which is usually what you want to do.

You need to keep going round the three steps above - until you have got an optimum solution. If you have a look at the two links below for some inspiration on the geometry layout.

http://gas-spring.fr/define-gas-schock.html

http://www.sgs-engineering.com/gas-struts/fixed

Last edited: Dec 12, 2013

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